2 * Copyright (c) 2008, 2009, 2010 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
23 #include <netinet/in.h>
29 #include "dynamic-string.h"
30 #include "fatal-signal.h"
33 #include "netdev-provider.h"
34 #include "netdev-vport.h"
36 #include "openflow/openflow.h"
38 #include "poll-loop.h"
43 VLOG_DEFINE_THIS_MODULE(netdev);
45 COVERAGE_DEFINE(netdev_received);
46 COVERAGE_DEFINE(netdev_sent);
47 COVERAGE_DEFINE(netdev_add_router);
48 COVERAGE_DEFINE(netdev_get_stats);
50 static struct shash netdev_classes = SHASH_INITIALIZER(&netdev_classes);
52 /* All created network devices. */
53 static struct shash netdev_dev_shash = SHASH_INITIALIZER(&netdev_dev_shash);
55 /* All open network devices. */
56 static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
58 /* This is set pretty low because we probably won't learn anything from the
59 * additional log messages. */
60 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
62 static void close_all_netdevs(void *aux OVS_UNUSED);
63 static int restore_flags(struct netdev *netdev);
64 void update_device_args(struct netdev_dev *, const struct shash *args);
67 netdev_initialize(void)
74 fatal_signal_add_hook(close_all_netdevs, NULL, NULL, true);
77 netdev_register_provider(&netdev_linux_class);
78 netdev_register_provider(&netdev_internal_class);
79 netdev_register_provider(&netdev_tap_class);
80 netdev_vport_register();
85 /* Performs periodic work needed by all the various kinds of netdevs.
87 * If your program opens any netdevs, it must call this function within its
92 struct shash_node *node;
93 SHASH_FOR_EACH(node, &netdev_classes) {
94 const struct netdev_class *netdev_class = node->data;
95 if (netdev_class->run) {
101 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
103 * If your program opens any netdevs, it must call this function within its
108 struct shash_node *node;
109 SHASH_FOR_EACH(node, &netdev_classes) {
110 const struct netdev_class *netdev_class = node->data;
111 if (netdev_class->wait) {
112 netdev_class->wait();
117 /* Initializes and registers a new netdev provider. After successful
118 * registration, new netdevs of that type can be opened using netdev_open(). */
120 netdev_register_provider(const struct netdev_class *new_class)
122 if (shash_find(&netdev_classes, new_class->type)) {
123 VLOG_WARN("attempted to register duplicate netdev provider: %s",
128 if (new_class->init) {
129 int error = new_class->init();
131 VLOG_ERR("failed to initialize %s network device class: %s",
132 new_class->type, strerror(error));
137 shash_add(&netdev_classes, new_class->type, new_class);
142 /* Unregisters a netdev provider. 'type' must have been previously
143 * registered and not currently be in use by any netdevs. After unregistration
144 * new netdevs of that type cannot be opened using netdev_open(). */
146 netdev_unregister_provider(const char *type)
148 struct shash_node *del_node, *netdev_dev_node;
150 del_node = shash_find(&netdev_classes, type);
152 VLOG_WARN("attempted to unregister a netdev provider that is not "
153 "registered: %s", type);
157 SHASH_FOR_EACH(netdev_dev_node, &netdev_dev_shash) {
158 struct netdev_dev *netdev_dev = netdev_dev_node->data;
159 if (!strcmp(netdev_dev->netdev_class->type, type)) {
160 VLOG_WARN("attempted to unregister in use netdev provider: %s",
166 shash_delete(&netdev_classes, del_node);
171 const struct netdev_class *
172 netdev_lookup_provider(const char *type)
175 return shash_find_data(&netdev_classes, type && type[0] ? type : "system");
178 /* Clears 'types' and enumerates the types of all currently registered netdev
179 * providers into it. The caller must first initialize the svec. */
181 netdev_enumerate_types(struct svec *types)
183 struct shash_node *node;
188 SHASH_FOR_EACH(node, &netdev_classes) {
189 const struct netdev_class *netdev_class = node->data;
190 svec_add(types, netdev_class->type);
194 /* Compares 'args' to those used to those used by 'dev'. Returns true
195 * if the arguments are the same, false otherwise. Does not update the
196 * values stored in 'dev'. */
198 compare_device_args(const struct netdev_dev *dev, const struct shash *args)
200 const struct shash_node **new_args;
204 if (shash_count(args) != dev->n_args) {
208 new_args = shash_sort(args);
209 for (i = 0; i < dev->n_args; i++) {
210 if (strcmp(dev->args[i].key, new_args[i]->name) ||
211 strcmp(dev->args[i].value, new_args[i]->data)) {
223 compare_args(const void *a_, const void *b_)
225 const struct arg *a = a_;
226 const struct arg *b = b_;
227 return strcmp(a->key, b->key);
231 update_device_args(struct netdev_dev *dev, const struct shash *args)
233 struct shash_node *node;
237 for (i = 0; i < dev->n_args; i++) {
238 free(dev->args[i].key);
239 free(dev->args[i].value);
246 if (!args || shash_is_empty(args)) {
250 dev->n_args = shash_count(args);
251 dev->args = xmalloc(dev->n_args * sizeof *dev->args);
254 SHASH_FOR_EACH(node, args) {
255 dev->args[i].key = xstrdup(node->name);
256 dev->args[i].value = xstrdup(node->data);
260 qsort(dev->args, dev->n_args, sizeof *dev->args, compare_args);
263 /* Opens the network device named 'name' (e.g. "eth0") and returns zero if
264 * successful, otherwise a positive errno value. On success, sets '*netdevp'
265 * to the new network device, otherwise to null.
267 * If this is the first time the device has been opened, then create is called
268 * before opening. The device is created using the given type and arguments.
270 * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
271 * capture frames of that type received on the device. It may also be one of
272 * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
275 netdev_open(struct netdev_options *options, struct netdev **netdevp)
277 struct shash empty_args = SHASH_INITIALIZER(&empty_args);
278 struct netdev_dev *netdev_dev;
284 if (!options->args) {
285 options->args = &empty_args;
288 netdev_dev = shash_find_data(&netdev_dev_shash, options->name);
291 const struct netdev_class *class;
293 class = netdev_lookup_provider(options->type);
295 VLOG_WARN("could not create netdev %s of unknown type %s",
296 options->name, options->type);
299 error = class->create(class, options->name, options->args,
304 assert(netdev_dev->netdev_class == class);
305 update_device_args(netdev_dev, options->args);
307 } else if (!shash_is_empty(options->args) &&
308 !compare_device_args(netdev_dev, options->args)) {
310 VLOG_WARN("%s: attempted to open already open netdev with "
311 "different arguments", options->name);
315 error = netdev_dev->netdev_class->open(netdev_dev, options->ethertype,
319 netdev_dev->ref_cnt++;
321 if (!netdev_dev->ref_cnt) {
322 netdev_dev_uninit(netdev_dev, true);
330 netdev_open_default(const char *name, struct netdev **netdevp)
332 struct netdev_options options;
334 memset(&options, 0, sizeof options);
336 options.ethertype = NETDEV_ETH_TYPE_NONE;
338 return netdev_open(&options, netdevp);
341 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
342 * or NULL if none are needed. */
344 netdev_reconfigure(struct netdev *netdev, const struct shash *args)
346 struct shash empty_args = SHASH_INITIALIZER(&empty_args);
347 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
353 if (netdev_dev->netdev_class->reconfigure) {
354 if (!compare_device_args(netdev_dev, args)) {
355 update_device_args(netdev_dev, args);
356 return netdev_dev->netdev_class->reconfigure(netdev_dev, args);
358 } else if (!shash_is_empty(args)) {
359 VLOG_WARN("%s: arguments provided to device that does not have a "
360 "reconfigure function", netdev_get_name(netdev));
366 /* Closes and destroys 'netdev'. */
368 netdev_close(struct netdev *netdev)
371 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
373 assert(netdev_dev->ref_cnt);
374 netdev_dev->ref_cnt--;
375 netdev_uninit(netdev, true);
377 /* If the reference count for the netdev device is zero, destroy it. */
378 if (!netdev_dev->ref_cnt) {
379 netdev_dev_uninit(netdev_dev, true);
384 /* Returns true if a network device named 'name' exists and may be opened,
385 * otherwise false. */
387 netdev_exists(const char *name)
389 struct netdev *netdev;
392 error = netdev_open_default(name, &netdev);
394 netdev_close(netdev);
397 if (error != ENODEV) {
398 VLOG_WARN("failed to open network device %s: %s",
399 name, strerror(error));
405 /* Returns true if a network device named 'name' is currently opened,
406 * otherwise false. */
408 netdev_is_open(const char *name)
410 return !!shash_find_data(&netdev_dev_shash, name);
413 /* Clears 'svec' and enumerates the names of all known network devices. */
415 netdev_enumerate(struct svec *svec)
417 struct shash_node *node;
423 SHASH_FOR_EACH(node, &netdev_classes) {
424 const struct netdev_class *netdev_class = node->data;
425 if (netdev_class->enumerate) {
426 int retval = netdev_class->enumerate(svec);
428 VLOG_WARN("failed to enumerate %s network devices: %s",
429 netdev_class->type, strerror(retval));
440 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
441 * must have initialized with sufficient room for the packet. The space
442 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
443 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
444 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
445 * need not be included.)
447 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
448 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
449 * positive errno value. Returns EAGAIN immediately if no packet is ready to
452 * Some network devices may not implement support for this function. In such
453 * cases this function will always return EOPNOTSUPP. */
455 netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
457 int (*recv)(struct netdev *, void *, size_t);
460 assert(buffer->size == 0);
461 assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
463 recv = netdev_get_dev(netdev)->netdev_class->recv;
465 ? (recv)(netdev, buffer->data, ofpbuf_tailroom(buffer))
468 COVERAGE_INC(netdev_received);
469 buffer->size += retval;
470 if (buffer->size < ETH_TOTAL_MIN) {
471 ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
479 /* Registers with the poll loop to wake up from the next call to poll_block()
480 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
482 netdev_recv_wait(struct netdev *netdev)
484 void (*recv_wait)(struct netdev *);
486 recv_wait = netdev_get_dev(netdev)->netdev_class->recv_wait;
492 /* Discards all packets waiting to be received from 'netdev'. */
494 netdev_drain(struct netdev *netdev)
496 int (*drain)(struct netdev *);
498 drain = netdev_get_dev(netdev)->netdev_class->drain;
499 return drain ? drain(netdev) : 0;
502 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
503 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
504 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
505 * the packet is too big or too small to transmit on the device.
507 * The caller retains ownership of 'buffer' in all cases.
509 * The kernel maintains a packet transmission queue, so the caller is not
510 * expected to do additional queuing of packets.
512 * Some network devices may not implement support for this function. In such
513 * cases this function will always return EOPNOTSUPP. */
515 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
517 int (*send)(struct netdev *, const void *, size_t);
520 send = netdev_get_dev(netdev)->netdev_class->send;
521 error = send ? (send)(netdev, buffer->data, buffer->size) : EOPNOTSUPP;
523 COVERAGE_INC(netdev_sent);
528 /* Registers with the poll loop to wake up from the next call to poll_block()
529 * when the packet transmission queue has sufficient room to transmit a packet
530 * with netdev_send().
532 * The kernel maintains a packet transmission queue, so the client is not
533 * expected to do additional queuing of packets. Thus, this function is
534 * unlikely to ever be used. It is included for completeness. */
536 netdev_send_wait(struct netdev *netdev)
538 void (*send_wait)(struct netdev *);
540 send_wait = netdev_get_dev(netdev)->netdev_class->send_wait;
546 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
547 * otherwise a positive errno value. */
549 netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
551 return netdev_get_dev(netdev)->netdev_class->set_etheraddr(netdev, mac);
554 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
555 * the MAC address into 'mac'. On failure, returns a positive errno value and
556 * clears 'mac' to all-zeros. */
558 netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
560 return netdev_get_dev(netdev)->netdev_class->get_etheraddr(netdev, mac);
563 /* Returns the name of the network device that 'netdev' represents,
564 * e.g. "eth0". The caller must not modify or free the returned string. */
566 netdev_get_name(const struct netdev *netdev)
568 return netdev_get_dev(netdev)->name;
571 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
572 * (and received) packets, in bytes, not including the hardware header; thus,
573 * this is typically 1500 bytes for Ethernet devices.
575 * If successful, returns 0 and stores the MTU size in '*mtup'. On failure,
576 * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in
579 netdev_get_mtu(const struct netdev *netdev, int *mtup)
581 int error = netdev_get_dev(netdev)->netdev_class->get_mtu(netdev, mtup);
583 VLOG_WARN_RL(&rl, "failed to retrieve MTU for network device %s: %s",
584 netdev_get_name(netdev), strerror(error));
585 *mtup = ETH_PAYLOAD_MAX;
590 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
591 * failure, returns a negative errno value.
593 * The desired semantics of the ifindex value are a combination of those
594 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
595 * value should be unique within a host and remain stable at least until
596 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
597 * but many systems do not follow this rule anyhow.
599 * Some network devices may not implement support for this function. In such
600 * cases this function will always return -EOPNOTSUPP.
603 netdev_get_ifindex(const struct netdev *netdev)
605 int (*get_ifindex)(const struct netdev *);
607 get_ifindex = netdev_get_dev(netdev)->netdev_class->get_ifindex;
609 return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
612 /* Stores the features supported by 'netdev' into each of '*current',
613 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
614 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
615 * successful, otherwise a positive errno value. On failure, all of the
616 * passed-in values are set to 0.
618 * Some network devices may not implement support for this function. In such
619 * cases this function will always return EOPNOTSUPP. */
621 netdev_get_features(struct netdev *netdev,
622 uint32_t *current, uint32_t *advertised,
623 uint32_t *supported, uint32_t *peer)
625 int (*get_features)(struct netdev *netdev,
626 uint32_t *current, uint32_t *advertised,
627 uint32_t *supported, uint32_t *peer);
635 advertised = &dummy[1];
638 supported = &dummy[2];
644 get_features = netdev_get_dev(netdev)->netdev_class->get_features;
646 ? get_features(netdev, current, advertised, supported, peer)
649 *current = *advertised = *supported = *peer = 0;
654 /* Returns the maximum speed of a network connection that has the "enum
655 * ofp_port_features" bits in 'features', in bits per second. If no bits that
656 * indicate a speed are set in 'features', assumes 100Mbps. */
658 netdev_features_to_bps(uint32_t features)
661 F_10000MB = OFPPF_10GB_FD,
662 F_1000MB = OFPPF_1GB_HD | OFPPF_1GB_FD,
663 F_100MB = OFPPF_100MB_HD | OFPPF_100MB_FD,
664 F_10MB = OFPPF_10MB_HD | OFPPF_10MB_FD
667 return ( features & F_10000MB ? UINT64_C(10000000000)
668 : features & F_1000MB ? UINT64_C(1000000000)
669 : features & F_100MB ? UINT64_C(100000000)
670 : features & F_10MB ? UINT64_C(10000000)
671 : UINT64_C(100000000));
674 /* Returns true if any of the "enum ofp_port_features" bits that indicate a
675 * full-duplex link are set in 'features', otherwise false. */
677 netdev_features_is_full_duplex(uint32_t features)
679 return (features & (OFPPF_10MB_FD | OFPPF_100MB_FD | OFPPF_1GB_FD
680 | OFPPF_10GB_FD)) != 0;
683 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
684 * successful, otherwise a positive errno value. */
686 netdev_set_advertisements(struct netdev *netdev, uint32_t advertise)
688 return (netdev_get_dev(netdev)->netdev_class->set_advertisements
689 ? netdev_get_dev(netdev)->netdev_class->set_advertisements(
694 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
695 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
696 * errno value and sets '*address' to 0 (INADDR_ANY).
698 * The following error values have well-defined meanings:
700 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
702 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
704 * 'address' or 'netmask' or both may be null, in which case the address or
705 * netmask is not reported. */
707 netdev_get_in4(const struct netdev *netdev,
708 struct in_addr *address_, struct in_addr *netmask_)
710 struct in_addr address;
711 struct in_addr netmask;
714 error = (netdev_get_dev(netdev)->netdev_class->get_in4
715 ? netdev_get_dev(netdev)->netdev_class->get_in4(netdev,
719 address_->s_addr = error ? 0 : address.s_addr;
722 netmask_->s_addr = error ? 0 : netmask.s_addr;
727 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
728 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
729 * positive errno value. */
731 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
733 return (netdev_get_dev(netdev)->netdev_class->set_in4
734 ? netdev_get_dev(netdev)->netdev_class->set_in4(netdev, addr, mask)
738 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
741 netdev_add_router(struct netdev *netdev, struct in_addr router)
743 COVERAGE_INC(netdev_add_router);
744 return (netdev_get_dev(netdev)->netdev_class->add_router
745 ? netdev_get_dev(netdev)->netdev_class->add_router(netdev, router)
749 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
750 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
751 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
752 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
753 * a directly connected network) in '*next_hop' and a copy of the name of the
754 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
755 * responsible for freeing '*netdev_name' (by calling free()). */
757 netdev_get_next_hop(const struct netdev *netdev,
758 const struct in_addr *host, struct in_addr *next_hop,
761 int error = (netdev_get_dev(netdev)->netdev_class->get_next_hop
762 ? netdev_get_dev(netdev)->netdev_class->get_next_hop(
763 host, next_hop, netdev_name)
766 next_hop->s_addr = 0;
772 /* Populates 'sh' with status information.
774 * Populates 'sh' with 'netdev' specific status information. This information
775 * may be used to populate the status column of the Interface table as defined
776 * in ovs-vswitchd.conf.db(5). */
778 netdev_get_status(const struct netdev *netdev, struct shash *sh)
780 struct netdev_dev *dev = netdev_get_dev(netdev);
782 return (dev->netdev_class->get_status
783 ? dev->netdev_class->get_status(netdev, sh)
787 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
788 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
789 * all-zero-bits (in6addr_any).
791 * The following error values have well-defined meanings:
793 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
795 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
797 * 'in6' may be null, in which case the address itself is not reported. */
799 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
801 struct in6_addr dummy;
804 error = (netdev_get_dev(netdev)->netdev_class->get_in6
805 ? netdev_get_dev(netdev)->netdev_class->get_in6(netdev,
809 memset(in6, 0, sizeof *in6);
814 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
815 * 'on'. If 'permanent' is true, the changes will persist; otherwise, they
816 * will be reverted when 'netdev' is closed or the program exits. Returns 0 if
817 * successful, otherwise a positive errno value. */
819 do_update_flags(struct netdev *netdev, enum netdev_flags off,
820 enum netdev_flags on, enum netdev_flags *old_flagsp,
823 enum netdev_flags old_flags;
826 error = netdev_get_dev(netdev)->netdev_class->update_flags(netdev,
827 off & ~on, on, &old_flags);
829 VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
830 off || on ? "set" : "get", netdev_get_name(netdev),
833 } else if ((off || on) && !permanent) {
834 enum netdev_flags new_flags = (old_flags & ~off) | on;
835 enum netdev_flags changed_flags = old_flags ^ new_flags;
837 if (!netdev->changed_flags) {
838 netdev->save_flags = old_flags;
840 netdev->changed_flags |= changed_flags;
844 *old_flagsp = old_flags;
849 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
850 * Returns 0 if successful, otherwise a positive errno value. On failure,
851 * stores 0 into '*flagsp'. */
853 netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
855 struct netdev *netdev = (struct netdev *) netdev_;
856 return do_update_flags(netdev, 0, 0, flagsp, false);
859 /* Sets the flags for 'netdev' to 'flags'.
860 * If 'permanent' is true, the changes will persist; otherwise, they
861 * will be reverted when 'netdev' is closed or the program exits.
862 * Returns 0 if successful, otherwise a positive errno value. */
864 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
867 return do_update_flags(netdev, -1, flags, NULL, permanent);
870 /* Turns on the specified 'flags' on 'netdev'.
871 * If 'permanent' is true, the changes will persist; otherwise, they
872 * will be reverted when 'netdev' is closed or the program exits.
873 * Returns 0 if successful, otherwise a positive errno value. */
875 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
878 return do_update_flags(netdev, 0, flags, NULL, permanent);
881 /* Turns off the specified 'flags' on 'netdev'.
882 * If 'permanent' is true, the changes will persist; otherwise, they
883 * will be reverted when 'netdev' is closed or the program exits.
884 * Returns 0 if successful, otherwise a positive errno value. */
886 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
889 return do_update_flags(netdev, flags, 0, NULL, permanent);
892 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
893 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
894 * returns 0. Otherwise, it returns a positive errno value; in particular,
895 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
897 netdev_arp_lookup(const struct netdev *netdev,
898 uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
900 int error = (netdev_get_dev(netdev)->netdev_class->arp_lookup
901 ? netdev_get_dev(netdev)->netdev_class->arp_lookup(netdev,
905 memset(mac, 0, ETH_ADDR_LEN);
910 /* Returns true if carrier is active (link light is on) on 'netdev'. */
912 netdev_get_carrier(const struct netdev *netdev)
915 enum netdev_flags flags;
918 netdev_get_flags(netdev, &flags);
919 if (!(flags & NETDEV_UP)) {
923 if (!netdev_get_dev(netdev)->netdev_class->get_carrier) {
927 error = netdev_get_dev(netdev)->netdev_class->get_carrier(netdev,
930 VLOG_DBG("%s: failed to get network device carrier status, assuming "
931 "down: %s", netdev_get_name(netdev), strerror(error));
938 /* Returns true if 'netdev' is up according to its MII. */
940 netdev_get_miimon(const struct netdev *netdev)
943 enum netdev_flags flags;
946 netdev_get_flags(netdev, &flags);
947 if (!(flags & NETDEV_UP)) {
951 if (!netdev_get_dev(netdev)->netdev_class->get_miimon) {
955 error = netdev_get_dev(netdev)->netdev_class->get_miimon(netdev, &miimon);
958 VLOG_DBG("%s: failed to get network device MII status, assuming "
959 "down: %s", netdev_get_name(netdev), strerror(error));
966 /* Retrieves current device stats for 'netdev'. */
968 netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
972 COVERAGE_INC(netdev_get_stats);
973 error = (netdev_get_dev(netdev)->netdev_class->get_stats
974 ? netdev_get_dev(netdev)->netdev_class->get_stats(netdev, stats)
977 memset(stats, 0xff, sizeof *stats);
982 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
983 * Returns 0 if successful, otherwise a positive errno value.
985 * This will probably fail for most network devices. Some devices might only
986 * allow setting their stats to 0. */
988 netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
990 return (netdev_get_dev(netdev)->netdev_class->set_stats
991 ? netdev_get_dev(netdev)->netdev_class->set_stats(netdev, stats)
995 /* Attempts to set input rate limiting (policing) policy, such that up to
996 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
997 * size of 'kbits' kb. */
999 netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
1000 uint32_t kbits_burst)
1002 return (netdev_get_dev(netdev)->netdev_class->set_policing
1003 ? netdev_get_dev(netdev)->netdev_class->set_policing(netdev,
1004 kbits_rate, kbits_burst)
1008 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
1009 * empty if 'netdev' does not support QoS. Any names added to 'types' should
1010 * be documented as valid for the "type" column in the "QoS" table in
1011 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1013 * Every network device supports disabling QoS with a type of "", but this type
1014 * will not be added to 'types'.
1016 * The caller must initialize 'types' (e.g. with svec_init()) before calling
1017 * this function. The caller is responsible for destroying 'types' (e.g. with
1018 * svec_destroy()) when it is no longer needed.
1020 * Returns 0 if successful, otherwise a positive errno value. */
1022 netdev_get_qos_types(const struct netdev *netdev, struct svec *types)
1024 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1025 return (class->get_qos_types
1026 ? class->get_qos_types(netdev, types)
1030 /* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
1031 * which should be "" or one of the types returned by netdev_get_qos_types()
1032 * for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
1033 * On success, initializes 'caps' with the QoS capabilities; on failure, clears
1034 * 'caps' to all zeros. */
1036 netdev_get_qos_capabilities(const struct netdev *netdev, const char *type,
1037 struct netdev_qos_capabilities *caps)
1039 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1042 int retval = (class->get_qos_capabilities
1043 ? class->get_qos_capabilities(netdev, type, caps)
1046 memset(caps, 0, sizeof *caps);
1050 /* Every netdev supports turning off QoS. */
1051 memset(caps, 0, sizeof *caps);
1056 /* Obtains the number of queues supported by 'netdev' for the specified 'type'
1057 * of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
1058 * the number of queues (zero on failure) in '*n_queuesp'.
1060 * This is just a simple wrapper around netdev_get_qos_capabilities(). */
1062 netdev_get_n_queues(const struct netdev *netdev,
1063 const char *type, unsigned int *n_queuesp)
1065 struct netdev_qos_capabilities caps;
1068 retval = netdev_get_qos_capabilities(netdev, type, &caps);
1069 *n_queuesp = caps.n_queues;
1073 /* Queries 'netdev' about its currently configured form of QoS. If successful,
1074 * stores the name of the current form of QoS into '*typep', stores any details
1075 * of configuration as string key-value pairs in 'details', and returns 0. On
1076 * failure, sets '*typep' to NULL and returns a positive errno value.
1078 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
1080 * The caller must initialize 'details' as an empty shash (e.g. with
1081 * shash_init()) before calling this function. The caller must free 'details',
1082 * including 'data' members, when it is no longer needed (e.g. with
1083 * shash_destroy_free_data()).
1085 * The caller must not modify or free '*typep'.
1087 * '*typep' will be one of the types returned by netdev_get_qos_types() for
1088 * 'netdev'. The contents of 'details' should be documented as valid for
1089 * '*typep' in the "other_config" column in the "QoS" table in
1090 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
1092 netdev_get_qos(const struct netdev *netdev,
1093 const char **typep, struct shash *details)
1095 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1098 if (class->get_qos) {
1099 retval = class->get_qos(netdev, typep, details);
1102 shash_clear_free_data(details);
1106 /* 'netdev' doesn't support QoS, so report that QoS is disabled. */
1112 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
1113 * with details of configuration from 'details'. Returns 0 if successful,
1114 * otherwise a positive errno value. On error, the previous QoS configuration
1117 * When this function changes the type of QoS (not just 'details'), this also
1118 * resets all queue configuration for 'netdev' to their defaults (which depend
1119 * on the specific type of QoS). Otherwise, the queue configuration for
1120 * 'netdev' is unchanged.
1122 * 'type' should be "" (to disable QoS) or one of the types returned by
1123 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
1124 * documented as valid for the given 'type' in the "other_config" column in the
1125 * "QoS" table in vswitchd/vswitch.xml (which is built as
1126 * ovs-vswitchd.conf.db(8)).
1128 * NULL may be specified for 'details' if there are no configuration
1131 netdev_set_qos(struct netdev *netdev,
1132 const char *type, const struct shash *details)
1134 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1140 if (class->set_qos) {
1142 static struct shash empty = SHASH_INITIALIZER(&empty);
1145 return class->set_qos(netdev, type, details);
1147 return *type ? EOPNOTSUPP : 0;
1151 /* Queries 'netdev' for information about the queue numbered 'queue_id'. If
1152 * successful, adds that information as string key-value pairs to 'details'.
1153 * Returns 0 if successful, otherwise a positive errno value.
1155 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1156 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1158 * The returned contents of 'details' should be documented as valid for the
1159 * given 'type' in the "other_config" column in the "Queue" table in
1160 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1162 * The caller must initialize 'details' (e.g. with shash_init()) before calling
1163 * this function. The caller must free 'details', including 'data' members,
1164 * when it is no longer needed (e.g. with shash_destroy_free_data()). */
1166 netdev_get_queue(const struct netdev *netdev,
1167 unsigned int queue_id, struct shash *details)
1169 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1172 retval = (class->get_queue
1173 ? class->get_queue(netdev, queue_id, details)
1176 shash_clear_free_data(details);
1181 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
1182 * string pairs in 'details'. The contents of 'details' should be documented
1183 * as valid for the given 'type' in the "other_config" column in the "Queue"
1184 * table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1185 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1186 * given queue's configuration should be unmodified.
1188 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1189 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1191 * This function does not modify 'details', and the caller retains ownership of
1194 netdev_set_queue(struct netdev *netdev,
1195 unsigned int queue_id, const struct shash *details)
1197 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1198 return (class->set_queue
1199 ? class->set_queue(netdev, queue_id, details)
1203 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
1204 * of QoS may have a fixed set of queues, in which case attempts to delete them
1205 * will fail with EOPNOTSUPP.
1207 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1208 * given queue will be unmodified.
1210 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1211 * the current form of QoS (e.g. as returned by
1212 * netdev_get_n_queues(netdev)). */
1214 netdev_delete_queue(struct netdev *netdev, unsigned int queue_id)
1216 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1217 return (class->delete_queue
1218 ? class->delete_queue(netdev, queue_id)
1222 /* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
1223 * fills 'stats' with the queue's statistics; individual members of 'stats' may
1224 * be set to all-1-bits if the statistic is unavailable. On failure, returns a
1225 * positive errno value and fills 'stats' with all-1-bits. */
1227 netdev_get_queue_stats(const struct netdev *netdev, unsigned int queue_id,
1228 struct netdev_queue_stats *stats)
1230 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1233 retval = (class->get_queue_stats
1234 ? class->get_queue_stats(netdev, queue_id, stats)
1237 memset(stats, 0xff, sizeof *stats);
1242 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1243 * its configuration, and the 'aux' specified by the caller. The order of
1244 * iteration is unspecified, but (when successful) each queue is visited
1247 * Calling this function may be more efficient than calling netdev_get_queue()
1250 * 'cb' must not modify or free the 'details' argument passed in.
1252 * Returns 0 if successful, otherwise a positive errno value. On error, some
1253 * configured queues may not have been included in the iteration. */
1255 netdev_dump_queues(const struct netdev *netdev,
1256 netdev_dump_queues_cb *cb, void *aux)
1258 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1259 return (class->dump_queues
1260 ? class->dump_queues(netdev, cb, aux)
1264 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1265 * its statistics, and the 'aux' specified by the caller. The order of
1266 * iteration is unspecified, but (when successful) each queue is visited
1269 * Calling this function may be more efficient than calling
1270 * netdev_get_queue_stats() for every queue.
1272 * 'cb' must not modify or free the statistics passed in.
1274 * Returns 0 if successful, otherwise a positive errno value. On error, some
1275 * configured queues may not have been included in the iteration. */
1277 netdev_dump_queue_stats(const struct netdev *netdev,
1278 netdev_dump_queue_stats_cb *cb, void *aux)
1280 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1281 return (class->dump_queue_stats
1282 ? class->dump_queue_stats(netdev, cb, aux)
1286 /* If 'netdev' is a VLAN network device (e.g. one created with vconfig(8)),
1287 * sets '*vlan_vid' to the VLAN VID associated with that device and returns 0.
1288 * Otherwise returns a errno value (specifically ENOENT if 'netdev_name' is the
1289 * name of a network device that is not a VLAN device) and sets '*vlan_vid' to
1292 netdev_get_vlan_vid(const struct netdev *netdev, int *vlan_vid)
1294 int error = (netdev_get_dev(netdev)->netdev_class->get_vlan_vid
1295 ? netdev_get_dev(netdev)->netdev_class->get_vlan_vid(netdev,
1304 /* Returns a network device that has 'in4' as its IP address, if one exists,
1305 * otherwise a null pointer. */
1307 netdev_find_dev_by_in4(const struct in_addr *in4)
1309 struct netdev *netdev;
1310 struct svec dev_list = SVEC_EMPTY_INITIALIZER;
1313 netdev_enumerate(&dev_list);
1314 for (i = 0; i < dev_list.n; i++) {
1315 const char *name = dev_list.names[i];
1316 struct in_addr dev_in4;
1318 if (!netdev_open_default(name, &netdev)
1319 && !netdev_get_in4(netdev, &dev_in4, NULL)
1320 && dev_in4.s_addr == in4->s_addr) {
1323 netdev_close(netdev);
1328 svec_destroy(&dev_list);
1332 /* Initializes 'netdev_dev' as a netdev device named 'name' of the
1333 * specified 'netdev_class'.
1335 * This function adds 'netdev_dev' to a netdev-owned shash, so it is
1336 * very important that 'netdev_dev' only be freed after calling
1337 * the refcount drops to zero. */
1339 netdev_dev_init(struct netdev_dev *netdev_dev, const char *name,
1340 const struct netdev_class *netdev_class)
1342 assert(!shash_find(&netdev_dev_shash, name));
1344 memset(netdev_dev, 0, sizeof *netdev_dev);
1345 netdev_dev->netdev_class = netdev_class;
1346 netdev_dev->name = xstrdup(name);
1347 netdev_dev->node = shash_add(&netdev_dev_shash, name, netdev_dev);
1350 /* Undoes the results of initialization.
1352 * Normally this function does not need to be called as netdev_close has
1353 * the same effect when the refcount drops to zero.
1354 * However, it may be called by providers due to an error on creation
1355 * that occurs after initialization. It this case netdev_close() would
1356 * never be called. */
1358 netdev_dev_uninit(struct netdev_dev *netdev_dev, bool destroy)
1360 char *name = netdev_dev->name;
1362 assert(!netdev_dev->ref_cnt);
1364 shash_delete(&netdev_dev_shash, netdev_dev->node);
1365 update_device_args(netdev_dev, NULL);
1368 netdev_dev->netdev_class->destroy(netdev_dev);
1373 /* Returns the class type of 'netdev_dev'.
1375 * The caller must not free the returned value. */
1377 netdev_dev_get_type(const struct netdev_dev *netdev_dev)
1379 return netdev_dev->netdev_class->type;
1382 /* Returns the class associated with 'netdev_dev'. */
1383 const struct netdev_class *
1384 netdev_dev_get_class(const struct netdev_dev *netdev_dev)
1386 return netdev_dev->netdev_class;
1389 /* Returns the name of 'netdev_dev'.
1391 * The caller must not free the returned value. */
1393 netdev_dev_get_name(const struct netdev_dev *netdev_dev)
1395 return netdev_dev->name;
1398 /* Returns the netdev_dev with 'name' or NULL if there is none.
1400 * The caller must not free the returned value. */
1402 netdev_dev_from_name(const char *name)
1404 return shash_find_data(&netdev_dev_shash, name);
1407 /* Fills 'device_list' with devices that match 'netdev_class'.
1409 * The caller is responsible for initializing and destroying 'device_list'
1410 * but the contained netdev_devs must not be freed. */
1412 netdev_dev_get_devices(const struct netdev_class *netdev_class,
1413 struct shash *device_list)
1415 struct shash_node *node;
1416 SHASH_FOR_EACH (node, &netdev_dev_shash) {
1417 struct netdev_dev *dev = node->data;
1419 if (dev->netdev_class == netdev_class) {
1420 shash_add(device_list, node->name, node->data);
1425 /* Initializes 'netdev' as a instance of the netdev_dev.
1427 * This function adds 'netdev' to a netdev-owned linked list, so it is very
1428 * important that 'netdev' only be freed after calling netdev_close(). */
1430 netdev_init(struct netdev *netdev, struct netdev_dev *netdev_dev)
1432 memset(netdev, 0, sizeof *netdev);
1433 netdev->netdev_dev = netdev_dev;
1434 list_push_back(&netdev_list, &netdev->node);
1437 /* Undoes the results of initialization.
1439 * Normally this function only needs to be called from netdev_close().
1440 * However, it may be called by providers due to an error on opening
1441 * that occurs after initialization. It this case netdev_close() would
1442 * never be called. */
1444 netdev_uninit(struct netdev *netdev, bool close)
1446 /* Restore flags that we changed, if any. */
1447 int error = restore_flags(netdev);
1448 list_remove(&netdev->node);
1450 VLOG_WARN("failed to restore network device flags on %s: %s",
1451 netdev_get_name(netdev), strerror(error));
1455 netdev_get_dev(netdev)->netdev_class->close(netdev);
1460 /* Returns the class type of 'netdev'.
1462 * The caller must not free the returned value. */
1464 netdev_get_type(const struct netdev *netdev)
1466 return netdev_get_dev(netdev)->netdev_class->type;
1470 netdev_get_dev(const struct netdev *netdev)
1472 return netdev->netdev_dev;
1475 /* Initializes 'notifier' as a netdev notifier for 'netdev', for which
1476 * notification will consist of calling 'cb', with auxiliary data 'aux'. */
1478 netdev_notifier_init(struct netdev_notifier *notifier, struct netdev *netdev,
1479 void (*cb)(struct netdev_notifier *), void *aux)
1481 notifier->netdev = netdev;
1483 notifier->aux = aux;
1486 /* Tracks changes in the status of a set of network devices. */
1487 struct netdev_monitor {
1488 struct shash polled_netdevs;
1489 struct shash changed_netdevs;
1492 /* Creates and returns a new structure for monitor changes in the status of
1493 * network devices. */
1494 struct netdev_monitor *
1495 netdev_monitor_create(void)
1497 struct netdev_monitor *monitor = xmalloc(sizeof *monitor);
1498 shash_init(&monitor->polled_netdevs);
1499 shash_init(&monitor->changed_netdevs);
1503 /* Destroys 'monitor'. */
1505 netdev_monitor_destroy(struct netdev_monitor *monitor)
1508 struct shash_node *node;
1510 SHASH_FOR_EACH (node, &monitor->polled_netdevs) {
1511 struct netdev_notifier *notifier = node->data;
1512 netdev_get_dev(notifier->netdev)->netdev_class->poll_remove(
1516 shash_destroy(&monitor->polled_netdevs);
1517 shash_destroy(&monitor->changed_netdevs);
1523 netdev_monitor_cb(struct netdev_notifier *notifier)
1525 struct netdev_monitor *monitor = notifier->aux;
1526 const char *name = netdev_get_name(notifier->netdev);
1527 shash_add_once(&monitor->changed_netdevs, name, NULL);
1530 /* Attempts to add 'netdev' as a netdev monitored by 'monitor'. Returns 0 if
1531 * successful, otherwise a positive errno value.
1533 * Adding a given 'netdev' to a monitor multiple times is equivalent to adding
1536 netdev_monitor_add(struct netdev_monitor *monitor, struct netdev *netdev)
1538 const char *netdev_name = netdev_get_name(netdev);
1540 if (!shash_find(&monitor->polled_netdevs, netdev_name)
1541 && netdev_get_dev(netdev)->netdev_class->poll_add)
1543 struct netdev_notifier *notifier;
1544 error = netdev_get_dev(netdev)->netdev_class->poll_add(netdev,
1545 netdev_monitor_cb, monitor, ¬ifier);
1547 assert(notifier->netdev == netdev);
1548 shash_add(&monitor->polled_netdevs, netdev_name, notifier);
1554 /* Removes 'netdev' from the set of netdevs monitored by 'monitor'. (This has
1555 * no effect if 'netdev' is not in the set of devices monitored by
1558 netdev_monitor_remove(struct netdev_monitor *monitor, struct netdev *netdev)
1560 const char *netdev_name = netdev_get_name(netdev);
1561 struct shash_node *node;
1563 node = shash_find(&monitor->polled_netdevs, netdev_name);
1565 /* Cancel future notifications. */
1566 struct netdev_notifier *notifier = node->data;
1567 netdev_get_dev(netdev)->netdev_class->poll_remove(notifier);
1568 shash_delete(&monitor->polled_netdevs, node);
1570 /* Drop any pending notification. */
1571 node = shash_find(&monitor->changed_netdevs, netdev_name);
1573 shash_delete(&monitor->changed_netdevs, node);
1578 /* Checks for changes to netdevs in the set monitored by 'monitor'. If any of
1579 * the attributes (Ethernet address, carrier status, speed or peer-advertised
1580 * speed, flags, etc.) of a network device monitored by 'monitor' has changed,
1581 * sets '*devnamep' to the name of a device that has changed and returns 0.
1582 * The caller is responsible for freeing '*devnamep' (with free()).
1584 * If no devices have changed, sets '*devnamep' to NULL and returns EAGAIN. */
1586 netdev_monitor_poll(struct netdev_monitor *monitor, char **devnamep)
1588 struct shash_node *node = shash_first(&monitor->changed_netdevs);
1593 *devnamep = shash_steal(&monitor->changed_netdevs, node);
1598 /* Registers with the poll loop to wake up from the next call to poll_block()
1599 * when netdev_monitor_poll(monitor) would indicate that a device has
1602 netdev_monitor_poll_wait(const struct netdev_monitor *monitor)
1604 if (!shash_is_empty(&monitor->changed_netdevs)) {
1605 poll_immediate_wake();
1607 /* XXX Nothing needed here for netdev_linux, but maybe other netdev
1608 * classes need help. */
1612 /* Restore the network device flags on 'netdev' to those that were active
1613 * before we changed them. Returns 0 if successful, otherwise a positive
1616 * To avoid reentry, the caller must ensure that fatal signals are blocked. */
1618 restore_flags(struct netdev *netdev)
1620 if (netdev->changed_flags) {
1621 enum netdev_flags restore = netdev->save_flags & netdev->changed_flags;
1622 enum netdev_flags old_flags;
1623 return netdev_get_dev(netdev)->netdev_class->update_flags(netdev,
1624 netdev->changed_flags & ~restore,
1625 restore, &old_flags);
1630 /* Close all netdevs on shutdown so they can do any needed cleanup such as
1631 * destroying devices, restoring flags, etc. */
1633 close_all_netdevs(void *aux OVS_UNUSED)
1635 struct netdev *netdev, *next;
1636 LIST_FOR_EACH_SAFE(netdev, next, node, &netdev_list) {
1637 netdev_close(netdev);