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"
35 #include "openflow/openflow.h"
37 #include "poll-loop.h"
41 #define THIS_MODULE VLM_netdev
44 static const struct netdev_class *base_netdev_classes[] = {
51 static struct shash netdev_classes = SHASH_INITIALIZER(&netdev_classes);
53 /* All created network devices. */
54 static struct shash netdev_dev_shash = SHASH_INITIALIZER(&netdev_dev_shash);
56 /* All open network devices. */
57 static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
59 /* This is set pretty low because we probably won't learn anything from the
60 * additional log messages. */
61 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
63 static void close_all_netdevs(void *aux OVS_UNUSED);
64 static int restore_flags(struct netdev *netdev);
65 void update_device_args(struct netdev_dev *, const struct shash *args);
68 netdev_initialize(void)
70 static int status = -1;
75 fatal_signal_add_hook(close_all_netdevs, NULL, NULL, true);
78 for (i = 0; i < ARRAY_SIZE(base_netdev_classes); i++) {
79 netdev_register_provider(base_netdev_classes[i]);
84 /* Performs periodic work needed by all the various kinds of netdevs.
86 * If your program opens any netdevs, it must call this function within its
91 struct shash_node *node;
92 SHASH_FOR_EACH(node, &netdev_classes) {
93 const struct netdev_class *netdev_class = node->data;
94 if (netdev_class->run) {
100 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
102 * If your program opens any netdevs, it must call this function within its
107 struct shash_node *node;
108 SHASH_FOR_EACH(node, &netdev_classes) {
109 const struct netdev_class *netdev_class = node->data;
110 if (netdev_class->wait) {
111 netdev_class->wait();
116 /* Initializes and registers a new netdev provider. After successful
117 * registration, new netdevs of that type can be opened using netdev_open(). */
119 netdev_register_provider(const struct netdev_class *new_class)
121 struct netdev_class *new_provider;
123 if (shash_find(&netdev_classes, new_class->type)) {
124 VLOG_WARN("attempted to register duplicate netdev provider: %s",
129 if (new_class->init) {
130 int error = new_class->init();
132 VLOG_ERR("failed to initialize %s network device class: %s",
133 new_class->type, strerror(error));
138 new_provider = xmalloc(sizeof *new_provider);
139 memcpy(new_provider, new_class, sizeof *new_provider);
141 shash_add(&netdev_classes, new_class->type, new_provider);
146 /* Unregisters a netdev provider. 'type' must have been previously
147 * registered and not currently be in use by any netdevs. After unregistration
148 * new netdevs of that type cannot be opened using netdev_open(). */
150 netdev_unregister_provider(const char *type)
152 struct shash_node *del_node, *netdev_dev_node;
154 del_node = shash_find(&netdev_classes, type);
156 VLOG_WARN("attempted to unregister a netdev provider that is not "
157 "registered: %s", type);
161 SHASH_FOR_EACH(netdev_dev_node, &netdev_dev_shash) {
162 struct netdev_dev *netdev_dev = netdev_dev_node->data;
163 if (!strcmp(netdev_dev->netdev_class->type, type)) {
164 VLOG_WARN("attempted to unregister in use netdev provider: %s",
170 shash_delete(&netdev_classes, del_node);
171 free(del_node->data);
176 /* Clears 'types' and enumerates the types of all currently registered netdev
177 * providers into it. The caller must first initialize the svec. */
179 netdev_enumerate_types(struct svec *types)
181 struct shash_node *node;
186 SHASH_FOR_EACH(node, &netdev_classes) {
187 const struct netdev_class *netdev_class = node->data;
188 svec_add(types, netdev_class->type);
192 /* Compares 'args' to those used to those used by 'dev'. Returns true
193 * if the arguments are the same, false otherwise. Does not update the
194 * values stored in 'dev'. */
196 compare_device_args(const struct netdev_dev *dev, const struct shash *args)
198 const struct shash_node **new_args;
202 if (shash_count(args) != dev->n_args) {
206 new_args = shash_sort(args);
207 for (i = 0; i < dev->n_args; i++) {
208 if (strcmp(dev->args[i].key, new_args[i]->name) ||
209 strcmp(dev->args[i].value, new_args[i]->data)) {
221 compare_args(const void *a_, const void *b_)
223 const struct arg *a = a_;
224 const struct arg *b = b_;
225 return strcmp(a->key, b->key);
229 update_device_args(struct netdev_dev *dev, const struct shash *args)
231 struct shash_node *node;
235 for (i = 0; i < dev->n_args; i++) {
236 free(dev->args[i].key);
237 free(dev->args[i].value);
244 if (!args || shash_is_empty(args)) {
248 dev->n_args = shash_count(args);
249 dev->args = xmalloc(dev->n_args * sizeof *dev->args);
252 SHASH_FOR_EACH(node, args) {
253 dev->args[i].key = xstrdup(node->name);
254 dev->args[i].value = xstrdup(node->data);
258 qsort(dev->args, dev->n_args, sizeof *dev->args, compare_args);
262 create_device(struct netdev_options *options, struct netdev_dev **netdev_devp)
264 struct netdev_class *netdev_class;
266 if (!options->may_create) {
267 VLOG_WARN("attempted to create a device that may not be created: %s",
272 if (!options->type || strlen(options->type) == 0) {
273 /* Default to system. */
274 options->type = "system";
277 netdev_class = shash_find_data(&netdev_classes, options->type);
279 VLOG_WARN("could not create netdev %s of unknown type %s",
280 options->name, options->type);
284 return netdev_class->create(options->name, options->type, options->args,
288 /* Opens the network device named 'name' (e.g. "eth0") and returns zero if
289 * successful, otherwise a positive errno value. On success, sets '*netdevp'
290 * to the new network device, otherwise to null.
292 * If this is the first time the device has been opened, then create is called
293 * before opening. The device is created using the given type and arguments.
295 * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
296 * capture frames of that type received on the device. It may also be one of
297 * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
300 * If the 'may_create' flag is set then this is allowed to be the first time
301 * the device is opened (i.e. the refcount will be 1 after this call). It
302 * may be set to false if the device should have already been created.
304 * If the 'may_open' flag is set then the call will succeed even if another
305 * caller has already opened it. It may be to false if the device should not
306 * currently be open. */
308 netdev_open(struct netdev_options *options, struct netdev **netdevp)
310 struct shash empty_args = SHASH_INITIALIZER(&empty_args);
311 struct netdev_dev *netdev_dev;
317 if (!options->args) {
318 options->args = &empty_args;
321 netdev_dev = shash_find_data(&netdev_dev_shash, options->name);
324 error = create_device(options, &netdev_dev);
328 update_device_args(netdev_dev, options->args);
330 } else if (options->may_open) {
331 if (!shash_is_empty(options->args) &&
332 !compare_device_args(netdev_dev, options->args)) {
334 VLOG_WARN("%s: attempted to open already created netdev with "
335 "different arguments", options->name);
339 VLOG_WARN("%s: attempted to create a netdev device with bound name",
344 error = netdev_dev->netdev_class->open(netdev_dev, options->ethertype,
348 netdev_dev->ref_cnt++;
350 if (!netdev_dev->ref_cnt) {
351 netdev_dev_uninit(netdev_dev, true);
359 netdev_open_default(const char *name, struct netdev **netdevp)
361 struct netdev_options options;
363 memset(&options, 0, sizeof options);
366 options.ethertype = NETDEV_ETH_TYPE_NONE;
367 options.may_create = true;
368 options.may_open = true;
370 return netdev_open(&options, netdevp);
373 /* Increments the reference count on 'netdev'. Returns 'netdev'. */
375 netdev_reopen(struct netdev *netdev)
381 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
382 * or NULL if none are needed. */
384 netdev_reconfigure(struct netdev *netdev, const struct shash *args)
386 struct shash empty_args = SHASH_INITIALIZER(&empty_args);
387 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
393 if (netdev_dev->netdev_class->reconfigure) {
394 if (!compare_device_args(netdev_dev, args)) {
395 update_device_args(netdev_dev, args);
396 return netdev_dev->netdev_class->reconfigure(netdev_dev, args);
398 } else if (!shash_is_empty(args)) {
399 VLOG_WARN("%s: arguments provided to device that does not have a "
400 "reconfigure function", netdev_get_name(netdev));
406 /* Decrements the reference count on 'netdev'. If the reference count reaches
407 * zero, closes and destroys 'netdev'. */
409 netdev_close(struct netdev *netdev)
411 assert(!netdev || netdev->ref_cnt > 0);
412 if (netdev && !--netdev->ref_cnt) {
413 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
415 assert(netdev_dev->ref_cnt);
416 netdev_dev->ref_cnt--;
417 netdev_uninit(netdev, true);
419 /* If the reference count for the netdev device is zero, destroy it. */
420 if (!netdev_dev->ref_cnt) {
421 netdev_dev_uninit(netdev_dev, true);
426 /* Returns true if a network device named 'name' exists and may be opened,
427 * otherwise false. */
429 netdev_exists(const char *name)
431 struct netdev *netdev;
434 error = netdev_open_default(name, &netdev);
436 netdev_close(netdev);
439 if (error != ENODEV) {
440 VLOG_WARN("failed to open network device %s: %s",
441 name, strerror(error));
447 /* Returns true if a network device named 'name' is currently opened,
448 * otherwise false. */
450 netdev_is_open(const char *name)
452 return !!shash_find_data(&netdev_dev_shash, name);
455 /* Clears 'svec' and enumerates the names of all known network devices. */
457 netdev_enumerate(struct svec *svec)
459 struct shash_node *node;
465 SHASH_FOR_EACH(node, &netdev_classes) {
466 const struct netdev_class *netdev_class = node->data;
467 if (netdev_class->enumerate) {
468 int retval = netdev_class->enumerate(svec);
470 VLOG_WARN("failed to enumerate %s network devices: %s",
471 netdev_class->type, strerror(retval));
482 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
483 * must have initialized with sufficient room for the packet. The space
484 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
485 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
486 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
487 * need not be included.)
489 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
490 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
491 * positive errno value. Returns EAGAIN immediately if no packet is ready to
494 * Some network devices may not implement support for this function. In such
495 * cases this function will always return EOPNOTSUPP.
498 netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
500 int (*recv)(struct netdev *, void *, size_t);
503 assert(buffer->size == 0);
504 assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
506 recv = netdev_get_dev(netdev)->netdev_class->recv;
508 ? (recv)(netdev, buffer->data, ofpbuf_tailroom(buffer))
511 COVERAGE_INC(netdev_received);
512 buffer->size += retval;
513 if (buffer->size < ETH_TOTAL_MIN) {
514 ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
522 /* Registers with the poll loop to wake up from the next call to poll_block()
523 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
525 netdev_recv_wait(struct netdev *netdev)
527 void (*recv_wait)(struct netdev *);
529 recv_wait = netdev_get_dev(netdev)->netdev_class->recv_wait;
535 /* Discards all packets waiting to be received from 'netdev'. */
537 netdev_drain(struct netdev *netdev)
539 int (*drain)(struct netdev *);
541 drain = netdev_get_dev(netdev)->netdev_class->drain;
542 return drain ? drain(netdev) : 0;
545 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
546 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
547 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
548 * the packet is too big or too small to transmit on the device.
550 * The caller retains ownership of 'buffer' in all cases.
552 * The kernel maintains a packet transmission queue, so the caller is not
553 * expected to do additional queuing of packets.
555 * Some network devices may not implement support for this function. In such
556 * cases this function will always return EOPNOTSUPP. */
558 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
560 int (*send)(struct netdev *, const void *, size_t);
563 send = netdev_get_dev(netdev)->netdev_class->send;
564 error = send ? (send)(netdev, buffer->data, buffer->size) : EOPNOTSUPP;
566 COVERAGE_INC(netdev_sent);
571 /* Registers with the poll loop to wake up from the next call to poll_block()
572 * when the packet transmission queue has sufficient room to transmit a packet
573 * with netdev_send().
575 * The kernel maintains a packet transmission queue, so the client is not
576 * expected to do additional queuing of packets. Thus, this function is
577 * unlikely to ever be used. It is included for completeness. */
579 netdev_send_wait(struct netdev *netdev)
581 void (*send_wait)(struct netdev *);
583 send_wait = netdev_get_dev(netdev)->netdev_class->send_wait;
589 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
590 * otherwise a positive errno value. */
592 netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
594 return netdev_get_dev(netdev)->netdev_class->set_etheraddr(netdev, mac);
597 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
598 * the MAC address into 'mac'. On failure, returns a positive errno value and
599 * clears 'mac' to all-zeros. */
601 netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
603 return netdev_get_dev(netdev)->netdev_class->get_etheraddr(netdev, mac);
606 /* Returns the name of the network device that 'netdev' represents,
607 * e.g. "eth0". The caller must not modify or free the returned string. */
609 netdev_get_name(const struct netdev *netdev)
611 return netdev_get_dev(netdev)->name;
614 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
615 * (and received) packets, in bytes, not including the hardware header; thus,
616 * this is typically 1500 bytes for Ethernet devices.
618 * If successful, returns 0 and stores the MTU size in '*mtup'. On failure,
619 * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in
622 netdev_get_mtu(const struct netdev *netdev, int *mtup)
624 int error = netdev_get_dev(netdev)->netdev_class->get_mtu(netdev, mtup);
626 VLOG_WARN_RL(&rl, "failed to retrieve MTU for network device %s: %s",
627 netdev_get_name(netdev), strerror(error));
628 *mtup = ETH_PAYLOAD_MAX;
633 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
634 * failure, returns a negative errno value.
636 * The desired semantics of the ifindex value are a combination of those
637 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
638 * value should be unique within a host and remain stable at least until
639 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
640 * but many systems do not follow this rule anyhow.
642 * Some network devices may not implement support for this function. In such
643 * cases this function will always return -EOPNOTSUPP.
646 netdev_get_ifindex(const struct netdev *netdev)
648 int (*get_ifindex)(const struct netdev *);
650 get_ifindex = netdev_get_dev(netdev)->netdev_class->get_ifindex;
652 return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
655 /* Stores the features supported by 'netdev' into each of '*current',
656 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
657 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
658 * successful, otherwise a positive errno value. On failure, all of the
659 * passed-in values are set to 0.
661 * Some network devices may not implement support for this function. In such
662 * cases this function will always return EOPNOTSUPP.
665 netdev_get_features(struct netdev *netdev,
666 uint32_t *current, uint32_t *advertised,
667 uint32_t *supported, uint32_t *peer)
669 int (*get_features)(struct netdev *netdev,
670 uint32_t *current, uint32_t *advertised,
671 uint32_t *supported, uint32_t *peer);
679 advertised = &dummy[1];
682 supported = &dummy[2];
688 get_features = netdev_get_dev(netdev)->netdev_class->get_features;
690 ? get_features(netdev, current, advertised, supported, peer)
693 *current = *advertised = *supported = *peer = 0;
698 /* Returns the maximum speed of a network connection that has the "enum
699 * ofp_port_features" bits in 'features', in bits per second. If no bits that
700 * indicate a speed are set in 'features', assumes 100Mbps. */
702 netdev_features_to_bps(uint32_t features)
705 F_10000MB = OFPPF_10GB_FD,
706 F_1000MB = OFPPF_1GB_HD | OFPPF_1GB_FD,
707 F_100MB = OFPPF_100MB_HD | OFPPF_100MB_FD,
708 F_10MB = OFPPF_10MB_HD | OFPPF_10MB_FD
711 return ( features & F_10000MB ? UINT64_C(10000000000)
712 : features & F_1000MB ? UINT64_C(1000000000)
713 : features & F_100MB ? UINT64_C(100000000)
714 : features & F_10MB ? UINT64_C(10000000)
715 : UINT64_C(100000000));
718 /* Returns true if any of the "enum ofp_port_features" bits that indicate a
719 * full-duplex link are set in 'features', otherwise false. */
721 netdev_features_is_full_duplex(uint32_t features)
723 return (features & (OFPPF_10MB_FD | OFPPF_100MB_FD | OFPPF_1GB_FD
724 | OFPPF_10GB_FD)) != 0;
727 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
728 * successful, otherwise a positive errno value. */
730 netdev_set_advertisements(struct netdev *netdev, uint32_t advertise)
732 return (netdev_get_dev(netdev)->netdev_class->set_advertisements
733 ? netdev_get_dev(netdev)->netdev_class->set_advertisements(
738 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
739 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
740 * errno value and sets '*address' to 0 (INADDR_ANY).
742 * The following error values have well-defined meanings:
744 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
746 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
748 * 'address' or 'netmask' or both may be null, in which case the address or netmask
749 * is not reported. */
751 netdev_get_in4(const struct netdev *netdev,
752 struct in_addr *address_, struct in_addr *netmask_)
754 struct in_addr address;
755 struct in_addr netmask;
758 error = (netdev_get_dev(netdev)->netdev_class->get_in4
759 ? netdev_get_dev(netdev)->netdev_class->get_in4(netdev,
763 address_->s_addr = error ? 0 : address.s_addr;
766 netmask_->s_addr = error ? 0 : netmask.s_addr;
771 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
772 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
773 * positive errno value. */
775 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
777 return (netdev_get_dev(netdev)->netdev_class->set_in4
778 ? netdev_get_dev(netdev)->netdev_class->set_in4(netdev, addr, mask)
782 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
785 netdev_add_router(struct netdev *netdev, struct in_addr router)
787 COVERAGE_INC(netdev_add_router);
788 return (netdev_get_dev(netdev)->netdev_class->add_router
789 ? netdev_get_dev(netdev)->netdev_class->add_router(netdev, router)
793 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
794 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
795 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
796 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
797 * a directly connected network) in '*next_hop' and a copy of the name of the
798 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
799 * responsible for freeing '*netdev_name' (by calling free()). */
801 netdev_get_next_hop(const struct netdev *netdev,
802 const struct in_addr *host, struct in_addr *next_hop,
805 int error = (netdev_get_dev(netdev)->netdev_class->get_next_hop
806 ? netdev_get_dev(netdev)->netdev_class->get_next_hop(
807 host, next_hop, netdev_name)
810 next_hop->s_addr = 0;
816 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
817 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
818 * all-zero-bits (in6addr_any).
820 * The following error values have well-defined meanings:
822 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
824 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
826 * 'in6' may be null, in which case the address itself is not reported. */
828 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
830 struct in6_addr dummy;
833 error = (netdev_get_dev(netdev)->netdev_class->get_in6
834 ? netdev_get_dev(netdev)->netdev_class->get_in6(netdev,
838 memset(in6, 0, sizeof *in6);
843 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
844 * 'on'. If 'permanent' is true, the changes will persist; otherwise, they
845 * will be reverted when 'netdev' is closed or the program exits. Returns 0 if
846 * successful, otherwise a positive errno value. */
848 do_update_flags(struct netdev *netdev, enum netdev_flags off,
849 enum netdev_flags on, enum netdev_flags *old_flagsp,
852 enum netdev_flags old_flags;
855 error = netdev_get_dev(netdev)->netdev_class->update_flags(netdev,
856 off & ~on, on, &old_flags);
858 VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
859 off || on ? "set" : "get", netdev_get_name(netdev),
862 } else if ((off || on) && !permanent) {
863 enum netdev_flags new_flags = (old_flags & ~off) | on;
864 enum netdev_flags changed_flags = old_flags ^ new_flags;
866 if (!netdev->changed_flags) {
867 netdev->save_flags = old_flags;
869 netdev->changed_flags |= changed_flags;
873 *old_flagsp = old_flags;
878 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
879 * Returns 0 if successful, otherwise a positive errno value. On failure,
880 * stores 0 into '*flagsp'. */
882 netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
884 struct netdev *netdev = (struct netdev *) netdev_;
885 return do_update_flags(netdev, 0, 0, flagsp, false);
888 /* Sets the flags for 'netdev' to 'flags'.
889 * If 'permanent' is true, the changes will persist; otherwise, they
890 * will be reverted when 'netdev' is closed or the program exits.
891 * Returns 0 if successful, otherwise a positive errno value. */
893 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
896 return do_update_flags(netdev, -1, flags, NULL, permanent);
899 /* Turns on the specified 'flags' on 'netdev'.
900 * If 'permanent' is true, the changes will persist; otherwise, they
901 * will be reverted when 'netdev' is closed or the program exits.
902 * Returns 0 if successful, otherwise a positive errno value. */
904 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
907 return do_update_flags(netdev, 0, flags, NULL, permanent);
910 /* Turns off the specified 'flags' on 'netdev'.
911 * If 'permanent' is true, the changes will persist; otherwise, they
912 * will be reverted when 'netdev' is closed or the program exits.
913 * Returns 0 if successful, otherwise a positive errno value. */
915 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
918 return do_update_flags(netdev, flags, 0, NULL, permanent);
921 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
922 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
923 * returns 0. Otherwise, it returns a positive errno value; in particular,
924 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
926 netdev_arp_lookup(const struct netdev *netdev,
927 uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
929 int error = (netdev_get_dev(netdev)->netdev_class->arp_lookup
930 ? netdev_get_dev(netdev)->netdev_class->arp_lookup(netdev,
934 memset(mac, 0, ETH_ADDR_LEN);
939 /* Sets 'carrier' to true if carrier is active (link light is on) on
942 netdev_get_carrier(const struct netdev *netdev, bool *carrier)
944 int error = (netdev_get_dev(netdev)->netdev_class->get_carrier
945 ? netdev_get_dev(netdev)->netdev_class->get_carrier(netdev,
954 /* Retrieves current device stats for 'netdev'. */
956 netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
960 COVERAGE_INC(netdev_get_stats);
961 error = (netdev_get_dev(netdev)->netdev_class->get_stats
962 ? netdev_get_dev(netdev)->netdev_class->get_stats(netdev, stats)
965 memset(stats, 0xff, sizeof *stats);
970 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
971 * Returns 0 if successful, otherwise a positive errno value.
973 * This will probably fail for most network devices. Some devices might only
974 * allow setting their stats to 0. */
976 netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
978 return (netdev_get_dev(netdev)->netdev_class->set_stats
979 ? netdev_get_dev(netdev)->netdev_class->set_stats(netdev, stats)
983 /* Attempts to set input rate limiting (policing) policy, such that up to
984 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
985 * size of 'kbits' kb. */
987 netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
988 uint32_t kbits_burst)
990 return (netdev_get_dev(netdev)->netdev_class->set_policing
991 ? netdev_get_dev(netdev)->netdev_class->set_policing(netdev,
992 kbits_rate, kbits_burst)
996 /* If 'netdev' is a VLAN network device (e.g. one created with vconfig(8)),
997 * sets '*vlan_vid' to the VLAN VID associated with that device and returns 0.
998 * Otherwise returns a errno value (specifically ENOENT if 'netdev_name' is the
999 * name of a network device that is not a VLAN device) and sets '*vlan_vid' to
1002 netdev_get_vlan_vid(const struct netdev *netdev, int *vlan_vid)
1004 int error = (netdev_get_dev(netdev)->netdev_class->get_vlan_vid
1005 ? netdev_get_dev(netdev)->netdev_class->get_vlan_vid(netdev,
1014 /* Returns a network device that has 'in4' as its IP address, if one exists,
1015 * otherwise a null pointer. */
1017 netdev_find_dev_by_in4(const struct in_addr *in4)
1019 struct netdev *netdev;
1020 struct svec dev_list = SVEC_EMPTY_INITIALIZER;
1023 netdev_enumerate(&dev_list);
1024 for (i = 0; i < dev_list.n; i++) {
1025 const char *name = dev_list.names[i];
1026 struct in_addr dev_in4;
1028 if (!netdev_open_default(name, &netdev)
1029 && !netdev_get_in4(netdev, &dev_in4, NULL)
1030 && dev_in4.s_addr == in4->s_addr) {
1033 netdev_close(netdev);
1038 svec_destroy(&dev_list);
1042 /* Initializes 'netdev_dev' as a netdev device named 'name' of the
1043 * specified 'netdev_class'.
1045 * This function adds 'netdev_dev' to a netdev-owned shash, so it is
1046 * very important that 'netdev_dev' only be freed after calling
1047 * the refcount drops to zero. */
1049 netdev_dev_init(struct netdev_dev *netdev_dev, const char *name,
1050 const struct netdev_class *netdev_class)
1052 assert(!shash_find(&netdev_dev_shash, name));
1054 memset(netdev_dev, 0, sizeof *netdev_dev);
1055 netdev_dev->netdev_class = netdev_class;
1056 netdev_dev->name = xstrdup(name);
1057 netdev_dev->node = shash_add(&netdev_dev_shash, name, netdev_dev);
1060 /* Undoes the results of initialization.
1062 * Normally this function does not need to be called as netdev_close has
1063 * the same effect when the refcount drops to zero.
1064 * However, it may be called by providers due to an error on creation
1065 * that occurs after initialization. It this case netdev_close() would
1066 * never be called. */
1068 netdev_dev_uninit(struct netdev_dev *netdev_dev, bool destroy)
1070 char *name = netdev_dev->name;
1072 assert(!netdev_dev->ref_cnt);
1074 shash_delete(&netdev_dev_shash, netdev_dev->node);
1075 update_device_args(netdev_dev, NULL);
1078 netdev_dev->netdev_class->destroy(netdev_dev);
1083 /* Returns the class type of 'netdev_dev'.
1085 * The caller must not free the returned value. */
1087 netdev_dev_get_type(const struct netdev_dev *netdev_dev)
1089 return netdev_dev->netdev_class->type;
1092 /* Returns the class associated with 'netdev_dev'. */
1093 const struct netdev_class *
1094 netdev_dev_get_class(const struct netdev_dev *netdev_dev)
1096 return netdev_dev->netdev_class;
1099 /* Returns the name of 'netdev_dev'.
1101 * The caller must not free the returned value. */
1103 netdev_dev_get_name(const struct netdev_dev *netdev_dev)
1105 return netdev_dev->name;
1108 /* Returns the netdev_dev with 'name' or NULL if there is none.
1110 * The caller must not free the returned value. */
1112 netdev_dev_from_name(const char *name)
1114 return shash_find_data(&netdev_dev_shash, name);
1117 /* Fills 'device_list' with devices that match 'netdev_class'.
1119 * The caller is responsible for initializing and destroying 'device_list'
1120 * but the contained netdev_devs must not be freed. */
1122 netdev_dev_get_devices(const struct netdev_class *netdev_class,
1123 struct shash *device_list)
1125 struct shash_node *node;
1126 SHASH_FOR_EACH (node, &netdev_dev_shash) {
1127 struct netdev_dev *dev = node->data;
1129 if (dev->netdev_class == netdev_class) {
1130 shash_add(device_list, node->name, node->data);
1135 /* Initializes 'netdev' as a instance of the netdev_dev.
1137 * This function adds 'netdev' to a netdev-owned linked list, so it is very
1138 * important that 'netdev' only be freed after calling netdev_close(). */
1140 netdev_init(struct netdev *netdev, struct netdev_dev *netdev_dev)
1142 memset(netdev, 0, sizeof *netdev);
1143 netdev->netdev_dev = netdev_dev;
1144 netdev->ref_cnt = 1;
1145 list_push_back(&netdev_list, &netdev->node);
1148 /* Undoes the results of initialization.
1150 * Normally this function only needs to be called from netdev_close().
1151 * However, it may be called by providers due to an error on opening
1152 * that occurs after initialization. In this case netdev_close() would
1153 * never be called. */
1155 netdev_uninit(struct netdev *netdev, bool close)
1157 /* Restore flags that we changed, if any. */
1158 int error = restore_flags(netdev);
1159 list_remove(&netdev->node);
1161 VLOG_WARN("failed to restore network device flags on %s: %s",
1162 netdev_get_name(netdev), strerror(error));
1166 netdev_get_dev(netdev)->netdev_class->close(netdev);
1171 /* Returns the class type of 'netdev'.
1173 * The caller must not free the returned value. */
1175 netdev_get_type(const struct netdev *netdev)
1177 return netdev_get_dev(netdev)->netdev_class->type;
1181 netdev_get_dev(const struct netdev *netdev)
1183 return netdev->netdev_dev;
1186 /* Initializes 'notifier' as a netdev notifier for 'netdev', for which
1187 * notification will consist of calling 'cb', with auxiliary data 'aux'. */
1189 netdev_notifier_init(struct netdev_notifier *notifier, struct netdev *netdev,
1190 void (*cb)(struct netdev_notifier *), void *aux)
1192 notifier->netdev = netdev;
1194 notifier->aux = aux;
1197 /* Tracks changes in the status of a set of network devices. */
1198 struct netdev_monitor {
1199 struct shash polled_netdevs;
1200 struct shash changed_netdevs;
1203 /* Creates and returns a new structure for monitor changes in the status of
1204 * network devices. */
1205 struct netdev_monitor *
1206 netdev_monitor_create(void)
1208 struct netdev_monitor *monitor = xmalloc(sizeof *monitor);
1209 shash_init(&monitor->polled_netdevs);
1210 shash_init(&monitor->changed_netdevs);
1214 /* Destroys 'monitor'. */
1216 netdev_monitor_destroy(struct netdev_monitor *monitor)
1219 struct shash_node *node;
1221 SHASH_FOR_EACH (node, &monitor->polled_netdevs) {
1222 struct netdev_notifier *notifier = node->data;
1223 netdev_get_dev(notifier->netdev)->netdev_class->poll_remove(
1227 shash_destroy(&monitor->polled_netdevs);
1228 shash_destroy(&monitor->changed_netdevs);
1234 netdev_monitor_cb(struct netdev_notifier *notifier)
1236 struct netdev_monitor *monitor = notifier->aux;
1237 const char *name = netdev_get_name(notifier->netdev);
1238 if (!shash_find(&monitor->changed_netdevs, name)) {
1239 shash_add(&monitor->changed_netdevs, name, NULL);
1243 /* Attempts to add 'netdev' as a netdev monitored by 'monitor'. Returns 0 if
1244 * successful, otherwise a positive errno value.
1246 * Adding a given 'netdev' to a monitor multiple times is equivalent to adding
1249 netdev_monitor_add(struct netdev_monitor *monitor, struct netdev *netdev)
1251 const char *netdev_name = netdev_get_name(netdev);
1253 if (!shash_find(&monitor->polled_netdevs, netdev_name)
1254 && netdev_get_dev(netdev)->netdev_class->poll_add)
1256 struct netdev_notifier *notifier;
1257 error = netdev_get_dev(netdev)->netdev_class->poll_add(netdev,
1258 netdev_monitor_cb, monitor, ¬ifier);
1260 assert(notifier->netdev == netdev);
1261 shash_add(&monitor->polled_netdevs, netdev_name, notifier);
1267 /* Removes 'netdev' from the set of netdevs monitored by 'monitor'. (This has
1268 * no effect if 'netdev' is not in the set of devices monitored by
1271 netdev_monitor_remove(struct netdev_monitor *monitor, struct netdev *netdev)
1273 const char *netdev_name = netdev_get_name(netdev);
1274 struct shash_node *node;
1276 node = shash_find(&monitor->polled_netdevs, netdev_name);
1278 /* Cancel future notifications. */
1279 struct netdev_notifier *notifier = node->data;
1280 netdev_get_dev(netdev)->netdev_class->poll_remove(notifier);
1281 shash_delete(&monitor->polled_netdevs, node);
1283 /* Drop any pending notification. */
1284 node = shash_find(&monitor->changed_netdevs, netdev_name);
1286 shash_delete(&monitor->changed_netdevs, node);
1291 /* Checks for changes to netdevs in the set monitored by 'monitor'. If any of
1292 * the attributes (Ethernet address, carrier status, speed or peer-advertised
1293 * speed, flags, etc.) of a network device monitored by 'monitor' has changed,
1294 * sets '*devnamep' to the name of a device that has changed and returns 0.
1295 * The caller is responsible for freeing '*devnamep' (with free()).
1297 * If no devices have changed, sets '*devnamep' to NULL and returns EAGAIN.
1300 netdev_monitor_poll(struct netdev_monitor *monitor, char **devnamep)
1302 struct shash_node *node = shash_first(&monitor->changed_netdevs);
1307 *devnamep = xstrdup(node->name);
1308 shash_delete(&monitor->changed_netdevs, node);
1313 /* Registers with the poll loop to wake up from the next call to poll_block()
1314 * when netdev_monitor_poll(monitor) would indicate that a device has
1317 netdev_monitor_poll_wait(const struct netdev_monitor *monitor)
1319 if (!shash_is_empty(&monitor->changed_netdevs)) {
1320 poll_immediate_wake();
1322 /* XXX Nothing needed here for netdev_linux, but maybe other netdev
1323 * classes need help. */
1327 /* Restore the network device flags on 'netdev' to those that were active
1328 * before we changed them. Returns 0 if successful, otherwise a positive
1331 * To avoid reentry, the caller must ensure that fatal signals are blocked. */
1333 restore_flags(struct netdev *netdev)
1335 if (netdev->changed_flags) {
1336 enum netdev_flags restore = netdev->save_flags & netdev->changed_flags;
1337 enum netdev_flags old_flags;
1338 return netdev_get_dev(netdev)->netdev_class->update_flags(netdev,
1339 netdev->changed_flags & ~restore,
1340 restore, &old_flags);
1345 /* Close all netdevs on shutdown so they can do any needed cleanup such as
1346 * destroying devices, restoring flags, etc. */
1348 close_all_netdevs(void *aux OVS_UNUSED)
1350 struct netdev *netdev, *next;
1351 LIST_FOR_EACH_SAFE(netdev, next, struct netdev, node, &netdev_list) {
1352 netdev_close(netdev);