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[] = {
53 static struct shash netdev_classes = SHASH_INITIALIZER(&netdev_classes);
55 /* All created network devices. */
56 static struct shash netdev_dev_shash = SHASH_INITIALIZER(&netdev_dev_shash);
58 /* All open network devices. */
59 static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
61 /* This is set pretty low because we probably won't learn anything from the
62 * additional log messages. */
63 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
65 static void close_all_netdevs(void *aux OVS_UNUSED);
66 static int restore_flags(struct netdev *netdev);
67 void update_device_args(struct netdev_dev *, const struct shash *args);
70 netdev_initialize(void)
72 static int status = -1;
77 fatal_signal_add_hook(close_all_netdevs, NULL, NULL, true);
80 for (i = 0; i < ARRAY_SIZE(base_netdev_classes); i++) {
81 netdev_register_provider(base_netdev_classes[i]);
86 /* Performs periodic work needed by all the various kinds of netdevs.
88 * If your program opens any netdevs, it must call this function within its
93 struct shash_node *node;
94 SHASH_FOR_EACH(node, &netdev_classes) {
95 const struct netdev_class *netdev_class = node->data;
96 if (netdev_class->run) {
102 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
104 * If your program opens any netdevs, it must call this function within its
109 struct shash_node *node;
110 SHASH_FOR_EACH(node, &netdev_classes) {
111 const struct netdev_class *netdev_class = node->data;
112 if (netdev_class->wait) {
113 netdev_class->wait();
118 /* Initializes and registers a new netdev provider. After successful
119 * registration, new netdevs of that type can be opened using netdev_open(). */
121 netdev_register_provider(const struct netdev_class *new_class)
123 struct netdev_class *new_provider;
125 if (shash_find(&netdev_classes, new_class->type)) {
126 VLOG_WARN("attempted to register duplicate netdev provider: %s",
131 if (new_class->init) {
132 int error = new_class->init();
134 VLOG_ERR("failed to initialize %s network device class: %s",
135 new_class->type, strerror(error));
140 new_provider = xmalloc(sizeof *new_provider);
141 memcpy(new_provider, new_class, sizeof *new_provider);
143 shash_add(&netdev_classes, new_class->type, new_provider);
148 /* Unregisters a netdev provider. 'type' must have been previously
149 * registered and not currently be in use by any netdevs. After unregistration
150 * new netdevs of that type cannot be opened using netdev_open(). */
152 netdev_unregister_provider(const char *type)
154 struct shash_node *del_node, *netdev_dev_node;
156 del_node = shash_find(&netdev_classes, type);
158 VLOG_WARN("attempted to unregister a netdev provider that is not "
159 "registered: %s", type);
163 SHASH_FOR_EACH(netdev_dev_node, &netdev_dev_shash) {
164 struct netdev_dev *netdev_dev = netdev_dev_node->data;
165 if (!strcmp(netdev_dev->netdev_class->type, type)) {
166 VLOG_WARN("attempted to unregister in use netdev provider: %s",
172 shash_delete(&netdev_classes, del_node);
173 free(del_node->data);
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);
264 create_device(struct netdev_options *options, struct netdev_dev **netdev_devp)
266 struct netdev_class *netdev_class;
268 if (!options->may_create) {
269 VLOG_WARN("attempted to create a device that may not be created: %s",
274 if (!options->type || strlen(options->type) == 0) {
275 /* Default to system. */
276 options->type = "system";
279 netdev_class = shash_find_data(&netdev_classes, options->type);
281 VLOG_WARN("could not create netdev %s of unknown type %s",
282 options->name, options->type);
286 return netdev_class->create(options->name, options->type, options->args,
290 /* Opens the network device named 'name' (e.g. "eth0") and returns zero if
291 * successful, otherwise a positive errno value. On success, sets '*netdevp'
292 * to the new network device, otherwise to null.
294 * If this is the first time the device has been opened, then create is called
295 * before opening. The device is created using the given type and arguments.
297 * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
298 * capture frames of that type received on the device. It may also be one of
299 * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
302 * If the 'may_create' flag is set then this is allowed to be the first time
303 * the device is opened (i.e. the refcount will be 1 after this call). It
304 * may be set to false if the device should have already been created.
306 * If the 'may_open' flag is set then the call will succeed even if another
307 * caller has already opened it. It may be to false if the device should not
308 * currently be open. */
310 netdev_open(struct netdev_options *options, struct netdev **netdevp)
312 struct shash empty_args = SHASH_INITIALIZER(&empty_args);
313 struct netdev_dev *netdev_dev;
319 if (!options->args) {
320 options->args = &empty_args;
323 netdev_dev = shash_find_data(&netdev_dev_shash, options->name);
326 error = create_device(options, &netdev_dev);
330 update_device_args(netdev_dev, options->args);
332 } else if (options->may_open) {
333 if (!shash_is_empty(options->args) &&
334 !compare_device_args(netdev_dev, options->args)) {
336 VLOG_WARN("%s: attempted to open already created netdev with "
337 "different arguments", options->name);
341 VLOG_WARN("%s: attempted to create a netdev device with bound name",
346 error = netdev_dev->netdev_class->open(netdev_dev, options->ethertype,
350 netdev_dev->ref_cnt++;
352 if (!netdev_dev->ref_cnt) {
353 netdev_dev_uninit(netdev_dev, true);
361 netdev_open_default(const char *name, struct netdev **netdevp)
363 struct netdev_options options;
365 memset(&options, 0, sizeof options);
368 options.ethertype = NETDEV_ETH_TYPE_NONE;
369 options.may_create = true;
370 options.may_open = true;
372 return netdev_open(&options, netdevp);
375 /* Increments the reference count on 'netdev'. Returns 'netdev'. */
377 netdev_reopen(struct netdev *netdev)
383 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
384 * or NULL if none are needed. */
386 netdev_reconfigure(struct netdev *netdev, const struct shash *args)
388 struct shash empty_args = SHASH_INITIALIZER(&empty_args);
389 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
395 if (netdev_dev->netdev_class->reconfigure) {
396 if (!compare_device_args(netdev_dev, args)) {
397 update_device_args(netdev_dev, args);
398 return netdev_dev->netdev_class->reconfigure(netdev_dev, args);
400 } else if (!shash_is_empty(args)) {
401 VLOG_WARN("%s: arguments provided to device that does not have a "
402 "reconfigure function", netdev_get_name(netdev));
408 /* Decrements the reference count on 'netdev'. If the reference count reaches
409 * zero, closes and destroys 'netdev'. */
411 netdev_close(struct netdev *netdev)
413 assert(!netdev || netdev->ref_cnt > 0);
414 if (netdev && !--netdev->ref_cnt) {
415 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
417 assert(netdev_dev->ref_cnt);
418 netdev_dev->ref_cnt--;
419 netdev_uninit(netdev, true);
421 /* If the reference count for the netdev device is zero, destroy it. */
422 if (!netdev_dev->ref_cnt) {
423 netdev_dev_uninit(netdev_dev, true);
428 /* Returns true if a network device named 'name' exists and may be opened,
429 * otherwise false. */
431 netdev_exists(const char *name)
433 struct netdev *netdev;
436 error = netdev_open_default(name, &netdev);
438 netdev_close(netdev);
441 if (error != ENODEV) {
442 VLOG_WARN("failed to open network device %s: %s",
443 name, strerror(error));
449 /* Returns true if a network device named 'name' is currently opened,
450 * otherwise false. */
452 netdev_is_open(const char *name)
454 return !!shash_find_data(&netdev_dev_shash, name);
457 /* Clears 'svec' and enumerates the names of all known network devices. */
459 netdev_enumerate(struct svec *svec)
461 struct shash_node *node;
467 SHASH_FOR_EACH(node, &netdev_classes) {
468 const struct netdev_class *netdev_class = node->data;
469 if (netdev_class->enumerate) {
470 int retval = netdev_class->enumerate(svec);
472 VLOG_WARN("failed to enumerate %s network devices: %s",
473 netdev_class->type, strerror(retval));
484 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
485 * must have initialized with sufficient room for the packet. The space
486 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
487 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
488 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
489 * need not be included.)
491 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
492 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
493 * positive errno value. Returns EAGAIN immediately if no packet is ready to
496 * Some network devices may not implement support for this function. In such
497 * cases this function will always return EOPNOTSUPP.
500 netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
502 int (*recv)(struct netdev *, void *, size_t);
505 assert(buffer->size == 0);
506 assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
508 recv = netdev_get_dev(netdev)->netdev_class->recv;
510 ? (recv)(netdev, buffer->data, ofpbuf_tailroom(buffer))
513 COVERAGE_INC(netdev_received);
514 buffer->size += retval;
515 if (buffer->size < ETH_TOTAL_MIN) {
516 ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
524 /* Registers with the poll loop to wake up from the next call to poll_block()
525 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
527 netdev_recv_wait(struct netdev *netdev)
529 void (*recv_wait)(struct netdev *);
531 recv_wait = netdev_get_dev(netdev)->netdev_class->recv_wait;
537 /* Discards all packets waiting to be received from 'netdev'. */
539 netdev_drain(struct netdev *netdev)
541 int (*drain)(struct netdev *);
543 drain = netdev_get_dev(netdev)->netdev_class->drain;
544 return drain ? drain(netdev) : 0;
547 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
548 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
549 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
550 * the packet is too big or too small to transmit on the device.
552 * The caller retains ownership of 'buffer' in all cases.
554 * The kernel maintains a packet transmission queue, so the caller is not
555 * expected to do additional queuing of packets.
557 * Some network devices may not implement support for this function. In such
558 * cases this function will always return EOPNOTSUPP. */
560 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
562 int (*send)(struct netdev *, const void *, size_t);
565 send = netdev_get_dev(netdev)->netdev_class->send;
566 error = send ? (send)(netdev, buffer->data, buffer->size) : EOPNOTSUPP;
568 COVERAGE_INC(netdev_sent);
573 /* Registers with the poll loop to wake up from the next call to poll_block()
574 * when the packet transmission queue has sufficient room to transmit a packet
575 * with netdev_send().
577 * The kernel maintains a packet transmission queue, so the client is not
578 * expected to do additional queuing of packets. Thus, this function is
579 * unlikely to ever be used. It is included for completeness. */
581 netdev_send_wait(struct netdev *netdev)
583 void (*send_wait)(struct netdev *);
585 send_wait = netdev_get_dev(netdev)->netdev_class->send_wait;
591 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
592 * otherwise a positive errno value. */
594 netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
596 return netdev_get_dev(netdev)->netdev_class->set_etheraddr(netdev, mac);
599 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
600 * the MAC address into 'mac'. On failure, returns a positive errno value and
601 * clears 'mac' to all-zeros. */
603 netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
605 return netdev_get_dev(netdev)->netdev_class->get_etheraddr(netdev, mac);
608 /* Returns the name of the network device that 'netdev' represents,
609 * e.g. "eth0". The caller must not modify or free the returned string. */
611 netdev_get_name(const struct netdev *netdev)
613 return netdev_get_dev(netdev)->name;
616 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
617 * (and received) packets, in bytes, not including the hardware header; thus,
618 * this is typically 1500 bytes for Ethernet devices.
620 * If successful, returns 0 and stores the MTU size in '*mtup'. On failure,
621 * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in
624 netdev_get_mtu(const struct netdev *netdev, int *mtup)
626 int error = netdev_get_dev(netdev)->netdev_class->get_mtu(netdev, mtup);
628 VLOG_WARN_RL(&rl, "failed to retrieve MTU for network device %s: %s",
629 netdev_get_name(netdev), strerror(error));
630 *mtup = ETH_PAYLOAD_MAX;
635 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
636 * failure, returns a negative errno value.
638 * The desired semantics of the ifindex value are a combination of those
639 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
640 * value should be unique within a host and remain stable at least until
641 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
642 * but many systems do not follow this rule anyhow.
644 * Some network devices may not implement support for this function. In such
645 * cases this function will always return -EOPNOTSUPP.
648 netdev_get_ifindex(const struct netdev *netdev)
650 int (*get_ifindex)(const struct netdev *);
652 get_ifindex = netdev_get_dev(netdev)->netdev_class->get_ifindex;
654 return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
657 /* Stores the features supported by 'netdev' into each of '*current',
658 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
659 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
660 * successful, otherwise a positive errno value. On failure, all of the
661 * passed-in values are set to 0.
663 * Some network devices may not implement support for this function. In such
664 * cases this function will always return EOPNOTSUPP.
667 netdev_get_features(struct netdev *netdev,
668 uint32_t *current, uint32_t *advertised,
669 uint32_t *supported, uint32_t *peer)
671 int (*get_features)(struct netdev *netdev,
672 uint32_t *current, uint32_t *advertised,
673 uint32_t *supported, uint32_t *peer);
681 advertised = &dummy[1];
684 supported = &dummy[2];
690 get_features = netdev_get_dev(netdev)->netdev_class->get_features;
692 ? get_features(netdev, current, advertised, supported, peer)
695 *current = *advertised = *supported = *peer = 0;
700 /* Returns the maximum speed of a network connection that has the "enum
701 * ofp_port_features" bits in 'features', in bits per second. If no bits that
702 * indicate a speed are set in 'features', assumes 100Mbps. */
704 netdev_features_to_bps(uint32_t features)
707 F_10000MB = OFPPF_10GB_FD,
708 F_1000MB = OFPPF_1GB_HD | OFPPF_1GB_FD,
709 F_100MB = OFPPF_100MB_HD | OFPPF_100MB_FD,
710 F_10MB = OFPPF_10MB_HD | OFPPF_10MB_FD
713 return ( features & F_10000MB ? UINT64_C(10000000000)
714 : features & F_1000MB ? UINT64_C(1000000000)
715 : features & F_100MB ? UINT64_C(100000000)
716 : features & F_10MB ? UINT64_C(10000000)
717 : UINT64_C(100000000));
720 /* Returns true if any of the "enum ofp_port_features" bits that indicate a
721 * full-duplex link are set in 'features', otherwise false. */
723 netdev_features_is_full_duplex(uint32_t features)
725 return (features & (OFPPF_10MB_FD | OFPPF_100MB_FD | OFPPF_1GB_FD
726 | OFPPF_10GB_FD)) != 0;
729 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
730 * successful, otherwise a positive errno value. */
732 netdev_set_advertisements(struct netdev *netdev, uint32_t advertise)
734 return (netdev_get_dev(netdev)->netdev_class->set_advertisements
735 ? netdev_get_dev(netdev)->netdev_class->set_advertisements(
740 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
741 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
742 * errno value and sets '*address' to 0 (INADDR_ANY).
744 * The following error values have well-defined meanings:
746 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
748 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
750 * 'address' or 'netmask' or both may be null, in which case the address or netmask
751 * is not reported. */
753 netdev_get_in4(const struct netdev *netdev,
754 struct in_addr *address_, struct in_addr *netmask_)
756 struct in_addr address;
757 struct in_addr netmask;
760 error = (netdev_get_dev(netdev)->netdev_class->get_in4
761 ? netdev_get_dev(netdev)->netdev_class->get_in4(netdev,
765 address_->s_addr = error ? 0 : address.s_addr;
768 netmask_->s_addr = error ? 0 : netmask.s_addr;
773 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
774 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
775 * positive errno value. */
777 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
779 return (netdev_get_dev(netdev)->netdev_class->set_in4
780 ? netdev_get_dev(netdev)->netdev_class->set_in4(netdev, addr, mask)
784 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
787 netdev_add_router(struct netdev *netdev, struct in_addr router)
789 COVERAGE_INC(netdev_add_router);
790 return (netdev_get_dev(netdev)->netdev_class->add_router
791 ? netdev_get_dev(netdev)->netdev_class->add_router(netdev, router)
795 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
796 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
797 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
798 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
799 * a directly connected network) in '*next_hop' and a copy of the name of the
800 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
801 * responsible for freeing '*netdev_name' (by calling free()). */
803 netdev_get_next_hop(const struct netdev *netdev,
804 const struct in_addr *host, struct in_addr *next_hop,
807 int error = (netdev_get_dev(netdev)->netdev_class->get_next_hop
808 ? netdev_get_dev(netdev)->netdev_class->get_next_hop(
809 host, next_hop, netdev_name)
812 next_hop->s_addr = 0;
818 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
819 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
820 * all-zero-bits (in6addr_any).
822 * The following error values have well-defined meanings:
824 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
826 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
828 * 'in6' may be null, in which case the address itself is not reported. */
830 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
832 struct in6_addr dummy;
835 error = (netdev_get_dev(netdev)->netdev_class->get_in6
836 ? netdev_get_dev(netdev)->netdev_class->get_in6(netdev,
840 memset(in6, 0, sizeof *in6);
845 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
846 * 'on'. If 'permanent' is true, the changes will persist; otherwise, they
847 * will be reverted when 'netdev' is closed or the program exits. Returns 0 if
848 * successful, otherwise a positive errno value. */
850 do_update_flags(struct netdev *netdev, enum netdev_flags off,
851 enum netdev_flags on, enum netdev_flags *old_flagsp,
854 enum netdev_flags old_flags;
857 error = netdev_get_dev(netdev)->netdev_class->update_flags(netdev,
858 off & ~on, on, &old_flags);
860 VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
861 off || on ? "set" : "get", netdev_get_name(netdev),
864 } else if ((off || on) && !permanent) {
865 enum netdev_flags new_flags = (old_flags & ~off) | on;
866 enum netdev_flags changed_flags = old_flags ^ new_flags;
868 if (!netdev->changed_flags) {
869 netdev->save_flags = old_flags;
871 netdev->changed_flags |= changed_flags;
875 *old_flagsp = old_flags;
880 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
881 * Returns 0 if successful, otherwise a positive errno value. On failure,
882 * stores 0 into '*flagsp'. */
884 netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
886 struct netdev *netdev = (struct netdev *) netdev_;
887 return do_update_flags(netdev, 0, 0, flagsp, false);
890 /* Sets the flags for 'netdev' to 'flags'.
891 * If 'permanent' is true, the changes will persist; otherwise, they
892 * will be reverted when 'netdev' is closed or the program exits.
893 * Returns 0 if successful, otherwise a positive errno value. */
895 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
898 return do_update_flags(netdev, -1, flags, NULL, permanent);
901 /* Turns on the specified 'flags' on 'netdev'.
902 * If 'permanent' is true, the changes will persist; otherwise, they
903 * will be reverted when 'netdev' is closed or the program exits.
904 * Returns 0 if successful, otherwise a positive errno value. */
906 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
909 return do_update_flags(netdev, 0, flags, NULL, permanent);
912 /* Turns off the specified 'flags' on 'netdev'.
913 * If 'permanent' is true, the changes will persist; otherwise, they
914 * will be reverted when 'netdev' is closed or the program exits.
915 * Returns 0 if successful, otherwise a positive errno value. */
917 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
920 return do_update_flags(netdev, flags, 0, NULL, permanent);
923 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
924 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
925 * returns 0. Otherwise, it returns a positive errno value; in particular,
926 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
928 netdev_arp_lookup(const struct netdev *netdev,
929 uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
931 int error = (netdev_get_dev(netdev)->netdev_class->arp_lookup
932 ? netdev_get_dev(netdev)->netdev_class->arp_lookup(netdev,
936 memset(mac, 0, ETH_ADDR_LEN);
941 /* Sets 'carrier' to true if carrier is active (link light is on) on
944 netdev_get_carrier(const struct netdev *netdev, bool *carrier)
946 int error = (netdev_get_dev(netdev)->netdev_class->get_carrier
947 ? netdev_get_dev(netdev)->netdev_class->get_carrier(netdev,
956 /* Retrieves current device stats for 'netdev'. */
958 netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
962 COVERAGE_INC(netdev_get_stats);
963 error = (netdev_get_dev(netdev)->netdev_class->get_stats
964 ? netdev_get_dev(netdev)->netdev_class->get_stats(netdev, stats)
967 memset(stats, 0xff, sizeof *stats);
972 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
973 * Returns 0 if successful, otherwise a positive errno value.
975 * This will probably fail for most network devices. Some devices might only
976 * allow setting their stats to 0. */
978 netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
980 return (netdev_get_dev(netdev)->netdev_class->set_stats
981 ? netdev_get_dev(netdev)->netdev_class->set_stats(netdev, stats)
985 /* Attempts to set input rate limiting (policing) policy, such that up to
986 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
987 * size of 'kbits' kb. */
989 netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
990 uint32_t kbits_burst)
992 return (netdev_get_dev(netdev)->netdev_class->set_policing
993 ? netdev_get_dev(netdev)->netdev_class->set_policing(netdev,
994 kbits_rate, kbits_burst)
998 /* If 'netdev' is a VLAN network device (e.g. one created with vconfig(8)),
999 * sets '*vlan_vid' to the VLAN VID associated with that device and returns 0.
1000 * Otherwise returns a errno value (specifically ENOENT if 'netdev_name' is the
1001 * name of a network device that is not a VLAN device) and sets '*vlan_vid' to
1004 netdev_get_vlan_vid(const struct netdev *netdev, int *vlan_vid)
1006 int error = (netdev_get_dev(netdev)->netdev_class->get_vlan_vid
1007 ? netdev_get_dev(netdev)->netdev_class->get_vlan_vid(netdev,
1016 /* Returns a network device that has 'in4' as its IP address, if one exists,
1017 * otherwise a null pointer. */
1019 netdev_find_dev_by_in4(const struct in_addr *in4)
1021 struct netdev *netdev;
1022 struct svec dev_list = SVEC_EMPTY_INITIALIZER;
1025 netdev_enumerate(&dev_list);
1026 for (i = 0; i < dev_list.n; i++) {
1027 const char *name = dev_list.names[i];
1028 struct in_addr dev_in4;
1030 if (!netdev_open_default(name, &netdev)
1031 && !netdev_get_in4(netdev, &dev_in4, NULL)
1032 && dev_in4.s_addr == in4->s_addr) {
1035 netdev_close(netdev);
1040 svec_destroy(&dev_list);
1044 /* Initializes 'netdev_dev' as a netdev device named 'name' of the
1045 * specified 'netdev_class'.
1047 * This function adds 'netdev_dev' to a netdev-owned shash, so it is
1048 * very important that 'netdev_dev' only be freed after calling
1049 * the refcount drops to zero. */
1051 netdev_dev_init(struct netdev_dev *netdev_dev, const char *name,
1052 const struct netdev_class *netdev_class)
1054 assert(!shash_find(&netdev_dev_shash, name));
1056 memset(netdev_dev, 0, sizeof *netdev_dev);
1057 netdev_dev->netdev_class = netdev_class;
1058 netdev_dev->name = xstrdup(name);
1059 netdev_dev->node = shash_add(&netdev_dev_shash, name, netdev_dev);
1062 /* Undoes the results of initialization.
1064 * Normally this function does not need to be called as netdev_close has
1065 * the same effect when the refcount drops to zero.
1066 * However, it may be called by providers due to an error on creation
1067 * that occurs after initialization. It this case netdev_close() would
1068 * never be called. */
1070 netdev_dev_uninit(struct netdev_dev *netdev_dev, bool destroy)
1072 char *name = netdev_dev->name;
1074 assert(!netdev_dev->ref_cnt);
1076 shash_delete(&netdev_dev_shash, netdev_dev->node);
1077 update_device_args(netdev_dev, NULL);
1080 netdev_dev->netdev_class->destroy(netdev_dev);
1085 /* Returns the class type of 'netdev_dev'.
1087 * The caller must not free the returned value. */
1089 netdev_dev_get_type(const struct netdev_dev *netdev_dev)
1091 return netdev_dev->netdev_class->type;
1094 /* Returns the class associated with 'netdev_dev'. */
1095 const struct netdev_class *
1096 netdev_dev_get_class(const struct netdev_dev *netdev_dev)
1098 return netdev_dev->netdev_class;
1101 /* Returns the name of 'netdev_dev'.
1103 * The caller must not free the returned value. */
1105 netdev_dev_get_name(const struct netdev_dev *netdev_dev)
1107 return netdev_dev->name;
1110 /* Returns the netdev_dev with 'name' or NULL if there is none.
1112 * The caller must not free the returned value. */
1114 netdev_dev_from_name(const char *name)
1116 return shash_find_data(&netdev_dev_shash, name);
1119 /* Fills 'device_list' with devices that match 'netdev_class'.
1121 * The caller is responsible for initializing and destroying 'device_list'
1122 * but the contained netdev_devs must not be freed. */
1124 netdev_dev_get_devices(const struct netdev_class *netdev_class,
1125 struct shash *device_list)
1127 struct shash_node *node;
1128 SHASH_FOR_EACH (node, &netdev_dev_shash) {
1129 struct netdev_dev *dev = node->data;
1131 if (dev->netdev_class == netdev_class) {
1132 shash_add(device_list, node->name, node->data);
1137 /* Initializes 'netdev' as a instance of the netdev_dev.
1139 * This function adds 'netdev' to a netdev-owned linked list, so it is very
1140 * important that 'netdev' only be freed after calling netdev_close(). */
1142 netdev_init(struct netdev *netdev, struct netdev_dev *netdev_dev)
1144 memset(netdev, 0, sizeof *netdev);
1145 netdev->netdev_dev = netdev_dev;
1146 netdev->ref_cnt = 1;
1147 list_push_back(&netdev_list, &netdev->node);
1150 /* Undoes the results of initialization.
1152 * Normally this function only needs to be called from netdev_close().
1153 * However, it may be called by providers due to an error on opening
1154 * that occurs after initialization. In this case netdev_close() would
1155 * never be called. */
1157 netdev_uninit(struct netdev *netdev, bool close)
1159 /* Restore flags that we changed, if any. */
1160 int error = restore_flags(netdev);
1161 list_remove(&netdev->node);
1163 VLOG_WARN("failed to restore network device flags on %s: %s",
1164 netdev_get_name(netdev), strerror(error));
1168 netdev_get_dev(netdev)->netdev_class->close(netdev);
1173 /* Returns the class type of 'netdev'.
1175 * The caller must not free the returned value. */
1177 netdev_get_type(const struct netdev *netdev)
1179 return netdev_get_dev(netdev)->netdev_class->type;
1183 netdev_get_dev(const struct netdev *netdev)
1185 return netdev->netdev_dev;
1188 /* Initializes 'notifier' as a netdev notifier for 'netdev', for which
1189 * notification will consist of calling 'cb', with auxiliary data 'aux'. */
1191 netdev_notifier_init(struct netdev_notifier *notifier, struct netdev *netdev,
1192 void (*cb)(struct netdev_notifier *), void *aux)
1194 notifier->netdev = netdev;
1196 notifier->aux = aux;
1199 /* Tracks changes in the status of a set of network devices. */
1200 struct netdev_monitor {
1201 struct shash polled_netdevs;
1202 struct shash changed_netdevs;
1205 /* Creates and returns a new structure for monitor changes in the status of
1206 * network devices. */
1207 struct netdev_monitor *
1208 netdev_monitor_create(void)
1210 struct netdev_monitor *monitor = xmalloc(sizeof *monitor);
1211 shash_init(&monitor->polled_netdevs);
1212 shash_init(&monitor->changed_netdevs);
1216 /* Destroys 'monitor'. */
1218 netdev_monitor_destroy(struct netdev_monitor *monitor)
1221 struct shash_node *node;
1223 SHASH_FOR_EACH (node, &monitor->polled_netdevs) {
1224 struct netdev_notifier *notifier = node->data;
1225 netdev_get_dev(notifier->netdev)->netdev_class->poll_remove(
1229 shash_destroy(&monitor->polled_netdevs);
1230 shash_destroy(&monitor->changed_netdevs);
1236 netdev_monitor_cb(struct netdev_notifier *notifier)
1238 struct netdev_monitor *monitor = notifier->aux;
1239 const char *name = netdev_get_name(notifier->netdev);
1240 if (!shash_find(&monitor->changed_netdevs, name)) {
1241 shash_add(&monitor->changed_netdevs, name, NULL);
1245 /* Attempts to add 'netdev' as a netdev monitored by 'monitor'. Returns 0 if
1246 * successful, otherwise a positive errno value.
1248 * Adding a given 'netdev' to a monitor multiple times is equivalent to adding
1251 netdev_monitor_add(struct netdev_monitor *monitor, struct netdev *netdev)
1253 const char *netdev_name = netdev_get_name(netdev);
1255 if (!shash_find(&monitor->polled_netdevs, netdev_name)
1256 && netdev_get_dev(netdev)->netdev_class->poll_add)
1258 struct netdev_notifier *notifier;
1259 error = netdev_get_dev(netdev)->netdev_class->poll_add(netdev,
1260 netdev_monitor_cb, monitor, ¬ifier);
1262 assert(notifier->netdev == netdev);
1263 shash_add(&monitor->polled_netdevs, netdev_name, notifier);
1269 /* Removes 'netdev' from the set of netdevs monitored by 'monitor'. (This has
1270 * no effect if 'netdev' is not in the set of devices monitored by
1273 netdev_monitor_remove(struct netdev_monitor *monitor, struct netdev *netdev)
1275 const char *netdev_name = netdev_get_name(netdev);
1276 struct shash_node *node;
1278 node = shash_find(&monitor->polled_netdevs, netdev_name);
1280 /* Cancel future notifications. */
1281 struct netdev_notifier *notifier = node->data;
1282 netdev_get_dev(netdev)->netdev_class->poll_remove(notifier);
1283 shash_delete(&monitor->polled_netdevs, node);
1285 /* Drop any pending notification. */
1286 node = shash_find(&monitor->changed_netdevs, netdev_name);
1288 shash_delete(&monitor->changed_netdevs, node);
1293 /* Checks for changes to netdevs in the set monitored by 'monitor'. If any of
1294 * the attributes (Ethernet address, carrier status, speed or peer-advertised
1295 * speed, flags, etc.) of a network device monitored by 'monitor' has changed,
1296 * sets '*devnamep' to the name of a device that has changed and returns 0.
1297 * The caller is responsible for freeing '*devnamep' (with free()).
1299 * If no devices have changed, sets '*devnamep' to NULL and returns EAGAIN.
1302 netdev_monitor_poll(struct netdev_monitor *monitor, char **devnamep)
1304 struct shash_node *node = shash_first(&monitor->changed_netdevs);
1309 *devnamep = xstrdup(node->name);
1310 shash_delete(&monitor->changed_netdevs, node);
1315 /* Registers with the poll loop to wake up from the next call to poll_block()
1316 * when netdev_monitor_poll(monitor) would indicate that a device has
1319 netdev_monitor_poll_wait(const struct netdev_monitor *monitor)
1321 if (!shash_is_empty(&monitor->changed_netdevs)) {
1322 poll_immediate_wake();
1324 /* XXX Nothing needed here for netdev_linux, but maybe other netdev
1325 * classes need help. */
1329 /* Restore the network device flags on 'netdev' to those that were active
1330 * before we changed them. Returns 0 if successful, otherwise a positive
1333 * To avoid reentry, the caller must ensure that fatal signals are blocked. */
1335 restore_flags(struct netdev *netdev)
1337 if (netdev->changed_flags) {
1338 enum netdev_flags restore = netdev->save_flags & netdev->changed_flags;
1339 enum netdev_flags old_flags;
1340 return netdev_get_dev(netdev)->netdev_class->update_flags(netdev,
1341 netdev->changed_flags & ~restore,
1342 restore, &old_flags);
1347 /* Close all netdevs on shutdown so they can do any needed cleanup such as
1348 * destroying devices, restoring flags, etc. */
1350 close_all_netdevs(void *aux OVS_UNUSED)
1352 struct netdev *netdev, *next;
1353 LIST_FOR_EACH_SAFE(netdev, next, struct netdev, node, &netdev_list) {
1354 netdev_close(netdev);