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"
42 VLOG_DEFINE_THIS_MODULE(netdev)
44 static const struct netdev_class *base_netdev_classes[] = {
54 static struct shash netdev_classes = SHASH_INITIALIZER(&netdev_classes);
56 /* All created network devices. */
57 static struct shash netdev_dev_shash = SHASH_INITIALIZER(&netdev_dev_shash);
59 /* All open network devices. */
60 static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
62 /* This is set pretty low because we probably won't learn anything from the
63 * additional log messages. */
64 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
66 static void close_all_netdevs(void *aux OVS_UNUSED);
67 static int restore_flags(struct netdev *netdev);
68 void update_device_args(struct netdev_dev *, const struct shash *args);
71 netdev_initialize(void)
73 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->type || strlen(options->type) == 0) {
269 /* Default to system. */
270 options->type = "system";
273 netdev_class = shash_find_data(&netdev_classes, options->type);
278 return netdev_class->create(options->name, options->type, options->args,
282 /* Opens the network device named 'name' (e.g. "eth0") and returns zero if
283 * successful, otherwise a positive errno value. On success, sets '*netdevp'
284 * to the new network device, otherwise to null.
286 * If this is the first time the device has been opened, then create is called
287 * before opening. The device is created using the given type and arguments.
289 * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
290 * capture frames of that type received on the device. It may also be one of
291 * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
295 netdev_open(struct netdev_options *options, struct netdev **netdevp)
297 struct shash empty_args = SHASH_INITIALIZER(&empty_args);
298 struct netdev_dev *netdev_dev;
304 if (!options->args) {
305 options->args = &empty_args;
308 netdev_dev = shash_find_data(&netdev_dev_shash, options->name);
311 error = create_device(options, &netdev_dev);
313 if (error == EAFNOSUPPORT) {
314 VLOG_WARN("could not create netdev %s of unknown type %s",
315 options->name, options->type);
319 update_device_args(netdev_dev, options->args);
321 } else if (!shash_is_empty(options->args) &&
322 !compare_device_args(netdev_dev, options->args)) {
324 VLOG_WARN("%s: attempted to open already open netdev with "
325 "different arguments", options->name);
329 error = netdev_dev->netdev_class->open(netdev_dev, options->ethertype,
333 netdev_dev->ref_cnt++;
335 if (!netdev_dev->ref_cnt) {
336 netdev_dev_uninit(netdev_dev, true);
344 netdev_open_default(const char *name, struct netdev **netdevp)
346 struct netdev_options options;
348 memset(&options, 0, sizeof options);
350 options.ethertype = NETDEV_ETH_TYPE_NONE;
352 return netdev_open(&options, netdevp);
355 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
356 * or NULL if none are needed. */
358 netdev_reconfigure(struct netdev *netdev, const struct shash *args)
360 struct shash empty_args = SHASH_INITIALIZER(&empty_args);
361 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
367 if (netdev_dev->netdev_class->reconfigure) {
368 if (!compare_device_args(netdev_dev, args)) {
369 update_device_args(netdev_dev, args);
370 return netdev_dev->netdev_class->reconfigure(netdev_dev, args);
372 } else if (!shash_is_empty(args)) {
373 VLOG_WARN("%s: arguments provided to device that does not have a "
374 "reconfigure function", netdev_get_name(netdev));
380 /* Closes and destroys 'netdev'. */
382 netdev_close(struct netdev *netdev)
385 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
387 assert(netdev_dev->ref_cnt);
388 netdev_dev->ref_cnt--;
389 netdev_uninit(netdev, true);
391 /* If the reference count for the netdev device is zero, destroy it. */
392 if (!netdev_dev->ref_cnt) {
393 netdev_dev_uninit(netdev_dev, true);
398 /* Returns true if a network device named 'name' exists and may be opened,
399 * otherwise false. */
401 netdev_exists(const char *name)
403 struct netdev *netdev;
406 error = netdev_open_default(name, &netdev);
408 netdev_close(netdev);
411 if (error != ENODEV) {
412 VLOG_WARN("failed to open network device %s: %s",
413 name, strerror(error));
419 /* Returns true if a network device named 'name' is currently opened,
420 * otherwise false. */
422 netdev_is_open(const char *name)
424 return !!shash_find_data(&netdev_dev_shash, name);
427 /* Clears 'svec' and enumerates the names of all known network devices. */
429 netdev_enumerate(struct svec *svec)
431 struct shash_node *node;
437 SHASH_FOR_EACH(node, &netdev_classes) {
438 const struct netdev_class *netdev_class = node->data;
439 if (netdev_class->enumerate) {
440 int retval = netdev_class->enumerate(svec);
442 VLOG_WARN("failed to enumerate %s network devices: %s",
443 netdev_class->type, strerror(retval));
454 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
455 * must have initialized with sufficient room for the packet. The space
456 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
457 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
458 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
459 * need not be included.)
461 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
462 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
463 * positive errno value. Returns EAGAIN immediately if no packet is ready to
466 * Some network devices may not implement support for this function. In such
467 * cases this function will always return EOPNOTSUPP.
470 netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
472 int (*recv)(struct netdev *, void *, size_t);
475 assert(buffer->size == 0);
476 assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
478 recv = netdev_get_dev(netdev)->netdev_class->recv;
480 ? (recv)(netdev, buffer->data, ofpbuf_tailroom(buffer))
483 COVERAGE_INC(netdev_received);
484 buffer->size += retval;
485 if (buffer->size < ETH_TOTAL_MIN) {
486 ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
494 /* Registers with the poll loop to wake up from the next call to poll_block()
495 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
497 netdev_recv_wait(struct netdev *netdev)
499 void (*recv_wait)(struct netdev *);
501 recv_wait = netdev_get_dev(netdev)->netdev_class->recv_wait;
508 /* Attempts to receive and process 'batch' packets from 'netdev'. */
510 netdev_dispatch(struct netdev *netdev, int batch, pkt_handler h, u_char *user)
512 int (*dispatch)(struct netdev*, int, pkt_handler, u_char *);
514 dispatch = netdev_get_dev(netdev)->netdev_class->dispatch;
515 return dispatch ? dispatch(netdev, batch, h, user) : 0;
518 /* Returns the file descriptor */
520 netdev_get_fd(struct netdev *netdev)
522 int (*get_fd)(struct netdev *);
524 get_fd = netdev_get_dev(netdev)->netdev_class->get_fd;
525 return get_fd ? get_fd(netdev) : 0;
529 /* Discards all packets waiting to be received from 'netdev'. */
531 netdev_drain(struct netdev *netdev)
533 int (*drain)(struct netdev *);
535 drain = netdev_get_dev(netdev)->netdev_class->drain;
536 return drain ? drain(netdev) : 0;
539 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
540 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
541 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
542 * the packet is too big or too small to transmit on the device.
544 * The caller retains ownership of 'buffer' in all cases.
546 * The kernel maintains a packet transmission queue, so the caller is not
547 * expected to do additional queuing of packets.
549 * Some network devices may not implement support for this function. In such
550 * cases this function will always return EOPNOTSUPP. */
552 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
554 int (*send)(struct netdev *, const void *, size_t);
557 send = netdev_get_dev(netdev)->netdev_class->send;
558 error = send ? (send)(netdev, buffer->data, buffer->size) : EOPNOTSUPP;
560 COVERAGE_INC(netdev_sent);
565 /* Registers with the poll loop to wake up from the next call to poll_block()
566 * when the packet transmission queue has sufficient room to transmit a packet
567 * with netdev_send().
569 * The kernel maintains a packet transmission queue, so the client is not
570 * expected to do additional queuing of packets. Thus, this function is
571 * unlikely to ever be used. It is included for completeness. */
573 netdev_send_wait(struct netdev *netdev)
575 void (*send_wait)(struct netdev *);
577 send_wait = netdev_get_dev(netdev)->netdev_class->send_wait;
583 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
584 * otherwise a positive errno value. */
586 netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
588 return netdev_get_dev(netdev)->netdev_class->set_etheraddr(netdev, mac);
591 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
592 * the MAC address into 'mac'. On failure, returns a positive errno value and
593 * clears 'mac' to all-zeros. */
595 netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
597 return netdev_get_dev(netdev)->netdev_class->get_etheraddr(netdev, mac);
600 /* Returns the name of the network device that 'netdev' represents,
601 * e.g. "eth0". The caller must not modify or free the returned string. */
603 netdev_get_name(const struct netdev *netdev)
605 return netdev_get_dev(netdev)->name;
608 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
609 * (and received) packets, in bytes, not including the hardware header; thus,
610 * this is typically 1500 bytes for Ethernet devices.
612 * If successful, returns 0 and stores the MTU size in '*mtup'. On failure,
613 * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in
616 netdev_get_mtu(const struct netdev *netdev, int *mtup)
618 int error = netdev_get_dev(netdev)->netdev_class->get_mtu(netdev, mtup);
620 VLOG_WARN_RL(&rl, "failed to retrieve MTU for network device %s: %s",
621 netdev_get_name(netdev), strerror(error));
622 *mtup = ETH_PAYLOAD_MAX;
627 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
628 * failure, returns a negative errno value.
630 * The desired semantics of the ifindex value are a combination of those
631 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
632 * value should be unique within a host and remain stable at least until
633 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
634 * but many systems do not follow this rule anyhow.
636 * Some network devices may not implement support for this function. In such
637 * cases this function will always return -EOPNOTSUPP.
640 netdev_get_ifindex(const struct netdev *netdev)
642 int (*get_ifindex)(const struct netdev *);
644 get_ifindex = netdev_get_dev(netdev)->netdev_class->get_ifindex;
646 return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
649 /* Stores the features supported by 'netdev' into each of '*current',
650 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
651 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
652 * successful, otherwise a positive errno value. On failure, all of the
653 * passed-in values are set to 0.
655 * Some network devices may not implement support for this function. In such
656 * cases this function will always return EOPNOTSUPP.
659 netdev_get_features(struct netdev *netdev,
660 uint32_t *current, uint32_t *advertised,
661 uint32_t *supported, uint32_t *peer)
663 int (*get_features)(struct netdev *netdev,
664 uint32_t *current, uint32_t *advertised,
665 uint32_t *supported, uint32_t *peer);
673 advertised = &dummy[1];
676 supported = &dummy[2];
682 get_features = netdev_get_dev(netdev)->netdev_class->get_features;
684 ? get_features(netdev, current, advertised, supported, peer)
687 *current = *advertised = *supported = *peer = 0;
692 /* Returns the maximum speed of a network connection that has the "enum
693 * ofp_port_features" bits in 'features', in bits per second. If no bits that
694 * indicate a speed are set in 'features', assumes 100Mbps. */
696 netdev_features_to_bps(uint32_t features)
699 F_10000MB = OFPPF_10GB_FD,
700 F_1000MB = OFPPF_1GB_HD | OFPPF_1GB_FD,
701 F_100MB = OFPPF_100MB_HD | OFPPF_100MB_FD,
702 F_10MB = OFPPF_10MB_HD | OFPPF_10MB_FD
705 return ( features & F_10000MB ? UINT64_C(10000000000)
706 : features & F_1000MB ? UINT64_C(1000000000)
707 : features & F_100MB ? UINT64_C(100000000)
708 : features & F_10MB ? UINT64_C(10000000)
709 : UINT64_C(100000000));
712 /* Returns true if any of the "enum ofp_port_features" bits that indicate a
713 * full-duplex link are set in 'features', otherwise false. */
715 netdev_features_is_full_duplex(uint32_t features)
717 return (features & (OFPPF_10MB_FD | OFPPF_100MB_FD | OFPPF_1GB_FD
718 | OFPPF_10GB_FD)) != 0;
721 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
722 * successful, otherwise a positive errno value. */
724 netdev_set_advertisements(struct netdev *netdev, uint32_t advertise)
726 return (netdev_get_dev(netdev)->netdev_class->set_advertisements
727 ? netdev_get_dev(netdev)->netdev_class->set_advertisements(
732 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
733 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
734 * errno value and sets '*address' to 0 (INADDR_ANY).
736 * The following error values have well-defined meanings:
738 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
740 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
742 * 'address' or 'netmask' or both may be null, in which case the address or netmask
743 * is not reported. */
745 netdev_get_in4(const struct netdev *netdev,
746 struct in_addr *address_, struct in_addr *netmask_)
748 struct in_addr address;
749 struct in_addr netmask;
752 error = (netdev_get_dev(netdev)->netdev_class->get_in4
753 ? netdev_get_dev(netdev)->netdev_class->get_in4(netdev,
757 address_->s_addr = error ? 0 : address.s_addr;
760 netmask_->s_addr = error ? 0 : netmask.s_addr;
765 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
766 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
767 * positive errno value. */
769 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
771 return (netdev_get_dev(netdev)->netdev_class->set_in4
772 ? netdev_get_dev(netdev)->netdev_class->set_in4(netdev, addr, mask)
776 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
779 netdev_add_router(struct netdev *netdev, struct in_addr router)
781 COVERAGE_INC(netdev_add_router);
782 return (netdev_get_dev(netdev)->netdev_class->add_router
783 ? netdev_get_dev(netdev)->netdev_class->add_router(netdev, router)
787 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
788 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
789 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
790 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
791 * a directly connected network) in '*next_hop' and a copy of the name of the
792 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
793 * responsible for freeing '*netdev_name' (by calling free()). */
795 netdev_get_next_hop(const struct netdev *netdev,
796 const struct in_addr *host, struct in_addr *next_hop,
799 int error = (netdev_get_dev(netdev)->netdev_class->get_next_hop
800 ? netdev_get_dev(netdev)->netdev_class->get_next_hop(
801 host, next_hop, netdev_name)
804 next_hop->s_addr = 0;
810 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
811 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
812 * all-zero-bits (in6addr_any).
814 * The following error values have well-defined meanings:
816 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
818 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
820 * 'in6' may be null, in which case the address itself is not reported. */
822 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
824 struct in6_addr dummy;
827 error = (netdev_get_dev(netdev)->netdev_class->get_in6
828 ? netdev_get_dev(netdev)->netdev_class->get_in6(netdev,
832 memset(in6, 0, sizeof *in6);
837 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
838 * 'on'. If 'permanent' is true, the changes will persist; otherwise, they
839 * will be reverted when 'netdev' is closed or the program exits. Returns 0 if
840 * successful, otherwise a positive errno value. */
842 do_update_flags(struct netdev *netdev, enum netdev_flags off,
843 enum netdev_flags on, enum netdev_flags *old_flagsp,
846 enum netdev_flags old_flags;
849 error = netdev_get_dev(netdev)->netdev_class->update_flags(netdev,
850 off & ~on, on, &old_flags);
852 VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
853 off || on ? "set" : "get", netdev_get_name(netdev),
856 } else if ((off || on) && !permanent) {
857 enum netdev_flags new_flags = (old_flags & ~off) | on;
858 enum netdev_flags changed_flags = old_flags ^ new_flags;
860 if (!netdev->changed_flags) {
861 netdev->save_flags = old_flags;
863 netdev->changed_flags |= changed_flags;
867 *old_flagsp = old_flags;
872 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
873 * Returns 0 if successful, otherwise a positive errno value. On failure,
874 * stores 0 into '*flagsp'. */
876 netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
878 struct netdev *netdev = (struct netdev *) netdev_;
879 return do_update_flags(netdev, 0, 0, flagsp, false);
882 /* Sets the flags for 'netdev' to 'flags'.
883 * If 'permanent' is true, the changes will persist; otherwise, they
884 * will be reverted when 'netdev' is closed or the program exits.
885 * Returns 0 if successful, otherwise a positive errno value. */
887 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
890 return do_update_flags(netdev, -1, flags, NULL, permanent);
893 /* Turns on the specified 'flags' on 'netdev'.
894 * If 'permanent' is true, the changes will persist; otherwise, they
895 * will be reverted when 'netdev' is closed or the program exits.
896 * Returns 0 if successful, otherwise a positive errno value. */
898 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
901 return do_update_flags(netdev, 0, flags, NULL, permanent);
904 /* Turns off the specified 'flags' on 'netdev'.
905 * If 'permanent' is true, the changes will persist; otherwise, they
906 * will be reverted when 'netdev' is closed or the program exits.
907 * Returns 0 if successful, otherwise a positive errno value. */
909 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
912 return do_update_flags(netdev, flags, 0, NULL, permanent);
915 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
916 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
917 * returns 0. Otherwise, it returns a positive errno value; in particular,
918 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
920 netdev_arp_lookup(const struct netdev *netdev,
921 uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
923 int error = (netdev_get_dev(netdev)->netdev_class->arp_lookup
924 ? netdev_get_dev(netdev)->netdev_class->arp_lookup(netdev,
928 memset(mac, 0, ETH_ADDR_LEN);
933 /* Sets 'carrier' to true if carrier is active (link light is on) on
936 netdev_get_carrier(const struct netdev *netdev, bool *carrier)
938 int error = (netdev_get_dev(netdev)->netdev_class->get_carrier
939 ? netdev_get_dev(netdev)->netdev_class->get_carrier(netdev,
948 /* Retrieves current device stats for 'netdev'. */
950 netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
954 COVERAGE_INC(netdev_get_stats);
955 error = (netdev_get_dev(netdev)->netdev_class->get_stats
956 ? netdev_get_dev(netdev)->netdev_class->get_stats(netdev, stats)
959 memset(stats, 0xff, sizeof *stats);
964 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
965 * Returns 0 if successful, otherwise a positive errno value.
967 * This will probably fail for most network devices. Some devices might only
968 * allow setting their stats to 0. */
970 netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
972 return (netdev_get_dev(netdev)->netdev_class->set_stats
973 ? netdev_get_dev(netdev)->netdev_class->set_stats(netdev, stats)
977 /* Attempts to set input rate limiting (policing) policy, such that up to
978 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
979 * size of 'kbits' kb. */
981 netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
982 uint32_t kbits_burst)
984 return (netdev_get_dev(netdev)->netdev_class->set_policing
985 ? netdev_get_dev(netdev)->netdev_class->set_policing(netdev,
986 kbits_rate, kbits_burst)
990 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
991 * empty if 'netdev' does not support QoS. Any names added to 'types' should
992 * be documented as valid for the "type" column in the "QoS" table in
993 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
995 * Every network device supports disabling QoS with a type of "", but this type
996 * will not be added to 'types'.
998 * The caller must initialize 'types' (e.g. with svec_init()) before calling
999 * this function. The caller is responsible for destroying 'types' (e.g. with
1000 * svec_destroy()) when it is no longer needed.
1002 * Returns 0 if successful, otherwise a positive errno value. */
1004 netdev_get_qos_types(const struct netdev *netdev, struct svec *types)
1006 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1007 return (class->get_qos_types
1008 ? class->get_qos_types(netdev, types)
1012 /* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
1013 * which should be "" or one of the types returned by netdev_get_qos_types()
1014 * for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
1015 * On success, initializes 'caps' with the QoS capabilities; on failure, clears
1016 * 'caps' to all zeros. */
1018 netdev_get_qos_capabilities(const struct netdev *netdev, const char *type,
1019 struct netdev_qos_capabilities *caps)
1021 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1024 int retval = (class->get_qos_capabilities
1025 ? class->get_qos_capabilities(netdev, type, caps)
1028 memset(caps, 0, sizeof *caps);
1032 /* Every netdev supports turning off QoS. */
1033 memset(caps, 0, sizeof *caps);
1038 /* Obtains the number of queues supported by 'netdev' for the specified 'type'
1039 * of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
1040 * the number of queues (zero on failure) in '*n_queuesp'.
1042 * This is just a simple wrapper around netdev_get_qos_capabilities(). */
1044 netdev_get_n_queues(const struct netdev *netdev,
1045 const char *type, unsigned int *n_queuesp)
1047 struct netdev_qos_capabilities caps;
1050 retval = netdev_get_qos_capabilities(netdev, type, &caps);
1051 *n_queuesp = caps.n_queues;
1055 /* Queries 'netdev' about its currently configured form of QoS. If successful,
1056 * stores the name of the current form of QoS into '*typep', stores any details
1057 * of configuration as string key-value pairs in 'details', and returns 0. On
1058 * failure, sets '*typep' to NULL and returns a positive errno value.
1060 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
1062 * The caller must initialize 'details' as an empty shash (e.g. with
1063 * shash_init()) before calling this function. The caller must free 'details',
1064 * including 'data' members, when it is no longer needed (e.g. with
1065 * shash_destroy_free_data()).
1067 * The caller must not modify or free '*typep'.
1069 * '*typep' will be one of the types returned by netdev_get_qos_types() for
1070 * 'netdev'. The contents of 'details' should be documented as valid for
1071 * '*typep' in the "other_config" column in the "QoS" table in
1072 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
1074 netdev_get_qos(const struct netdev *netdev,
1075 const char **typep, struct shash *details)
1077 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1080 if (class->get_qos) {
1081 retval = class->get_qos(netdev, typep, details);
1084 shash_clear_free_data(details);
1088 /* 'netdev' doesn't support QoS, so report that QoS is disabled. */
1094 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
1095 * with details of configuration from 'details'. Returns 0 if successful,
1096 * otherwise a positive errno value. On error, the previous QoS configuration
1099 * When this function changes the type of QoS (not just 'details'), this also
1100 * resets all queue configuration for 'netdev' to their defaults (which depend
1101 * on the specific type of QoS). Otherwise, the queue configuration for
1102 * 'netdev' is unchanged.
1104 * 'type' should be "" (to disable QoS) or one of the types returned by
1105 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
1106 * documented as valid for the given 'type' in the "other_config" column in the
1107 * "QoS" table in vswitchd/vswitch.xml (which is built as
1108 * ovs-vswitchd.conf.db(8)).
1110 * NULL may be specified for 'details' if there are no configuration
1113 netdev_set_qos(struct netdev *netdev,
1114 const char *type, const struct shash *details)
1116 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1122 if (class->set_qos) {
1124 static struct shash empty = SHASH_INITIALIZER(&empty);
1127 return class->set_qos(netdev, type, details);
1129 return *type ? EOPNOTSUPP : 0;
1133 /* Queries 'netdev' for information about the queue numbered 'queue_id'. If
1134 * successful, adds that information as string key-value pairs to 'details'.
1135 * Returns 0 if successful, otherwise a positive errno value.
1137 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1138 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1140 * The returned contents of 'details' should be documented as valid for the
1141 * given 'type' in the "other_config" column in the "Queue" table in
1142 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1144 * The caller must initialize 'details' (e.g. with shash_init()) before calling
1145 * this function. The caller must free 'details', including 'data' members,
1146 * when it is no longer needed (e.g. with shash_destroy_free_data()). */
1148 netdev_get_queue(const struct netdev *netdev,
1149 unsigned int queue_id, struct shash *details)
1151 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1154 retval = (class->get_queue
1155 ? class->get_queue(netdev, queue_id, details)
1158 shash_clear_free_data(details);
1163 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
1164 * string pairs in 'details'. The contents of 'details' should be documented
1165 * as valid for the given 'type' in the "other_config" column in the "Queue"
1166 * table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1167 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1168 * given queue's configuration should be unmodified.
1170 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1171 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1173 * This function does not modify 'details', and the caller retains ownership of
1177 netdev_set_queue(struct netdev *netdev,
1178 unsigned int queue_id, const struct shash *details)
1180 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1181 return (class->set_queue
1182 ? class->set_queue(netdev, queue_id, details)
1186 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
1187 * of QoS may have a fixed set of queues, in which case attempts to delete them
1188 * will fail with EOPNOTSUPP.
1190 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1191 * given queue will be unmodified.
1193 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1194 * the current form of QoS (e.g. as returned by
1195 * netdev_get_n_queues(netdev)). */
1197 netdev_delete_queue(struct netdev *netdev, unsigned int queue_id)
1199 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1200 return (class->delete_queue
1201 ? class->delete_queue(netdev, queue_id)
1205 /* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
1206 * fills 'stats' with the queue's statistics; individual members of 'stats' may
1207 * be set to all-1-bits if the statistic is unavailable. On failure, returns a
1208 * positive errno value and fills 'stats' with all-1-bits. */
1210 netdev_get_queue_stats(const struct netdev *netdev, unsigned int queue_id,
1211 struct netdev_queue_stats *stats)
1213 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1216 retval = (class->get_queue_stats
1217 ? class->get_queue_stats(netdev, queue_id, stats)
1220 memset(stats, 0xff, sizeof *stats);
1225 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1226 * its configuration, and the 'aux' specified by the caller. The order of
1227 * iteration is unspecified, but (when successful) each queue is visited
1230 * Calling this function may be more efficient than calling netdev_get_queue()
1233 * 'cb' must not modify or free the 'details' argument passed in.
1235 * Returns 0 if successful, otherwise a positive errno value. On error, some
1236 * configured queues may not have been included in the iteration. */
1238 netdev_dump_queues(const struct netdev *netdev,
1239 netdev_dump_queues_cb *cb, void *aux)
1241 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1242 return (class->dump_queues
1243 ? class->dump_queues(netdev, cb, aux)
1247 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1248 * its statistics, and the 'aux' specified by the caller. The order of
1249 * iteration is unspecified, but (when successful) each queue is visited
1252 * Calling this function may be more efficient than calling
1253 * netdev_get_queue_stats() for every queue.
1255 * 'cb' must not modify or free the statistics passed in.
1257 * Returns 0 if successful, otherwise a positive errno value. On error, some
1258 * configured queues may not have been included in the iteration. */
1260 netdev_dump_queue_stats(const struct netdev *netdev,
1261 netdev_dump_queue_stats_cb *cb, void *aux)
1263 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1264 return (class->dump_queue_stats
1265 ? class->dump_queue_stats(netdev, cb, aux)
1269 /* If 'netdev' is a VLAN network device (e.g. one created with vconfig(8)),
1270 * sets '*vlan_vid' to the VLAN VID associated with that device and returns 0.
1271 * Otherwise returns a errno value (specifically ENOENT if 'netdev_name' is the
1272 * name of a network device that is not a VLAN device) and sets '*vlan_vid' to
1275 netdev_get_vlan_vid(const struct netdev *netdev, int *vlan_vid)
1277 int error = (netdev_get_dev(netdev)->netdev_class->get_vlan_vid
1278 ? netdev_get_dev(netdev)->netdev_class->get_vlan_vid(netdev,
1287 /* Returns a network device that has 'in4' as its IP address, if one exists,
1288 * otherwise a null pointer. */
1290 netdev_find_dev_by_in4(const struct in_addr *in4)
1292 struct netdev *netdev;
1293 struct svec dev_list = SVEC_EMPTY_INITIALIZER;
1296 netdev_enumerate(&dev_list);
1297 for (i = 0; i < dev_list.n; i++) {
1298 const char *name = dev_list.names[i];
1299 struct in_addr dev_in4;
1301 if (!netdev_open_default(name, &netdev)
1302 && !netdev_get_in4(netdev, &dev_in4, NULL)
1303 && dev_in4.s_addr == in4->s_addr) {
1306 netdev_close(netdev);
1311 svec_destroy(&dev_list);
1315 /* Initializes 'netdev_dev' as a netdev device named 'name' of the
1316 * specified 'netdev_class'.
1318 * This function adds 'netdev_dev' to a netdev-owned shash, so it is
1319 * very important that 'netdev_dev' only be freed after calling
1320 * the refcount drops to zero. */
1322 netdev_dev_init(struct netdev_dev *netdev_dev, const char *name,
1323 const struct netdev_class *netdev_class)
1325 assert(!shash_find(&netdev_dev_shash, name));
1327 memset(netdev_dev, 0, sizeof *netdev_dev);
1328 netdev_dev->netdev_class = netdev_class;
1329 netdev_dev->name = xstrdup(name);
1330 netdev_dev->node = shash_add(&netdev_dev_shash, name, netdev_dev);
1333 /* Undoes the results of initialization.
1335 * Normally this function does not need to be called as netdev_close has
1336 * the same effect when the refcount drops to zero.
1337 * However, it may be called by providers due to an error on creation
1338 * that occurs after initialization. It this case netdev_close() would
1339 * never be called. */
1341 netdev_dev_uninit(struct netdev_dev *netdev_dev, bool destroy)
1343 char *name = netdev_dev->name;
1345 assert(!netdev_dev->ref_cnt);
1347 shash_delete(&netdev_dev_shash, netdev_dev->node);
1348 update_device_args(netdev_dev, NULL);
1351 netdev_dev->netdev_class->destroy(netdev_dev);
1356 /* Returns the class type of 'netdev_dev'.
1358 * The caller must not free the returned value. */
1360 netdev_dev_get_type(const struct netdev_dev *netdev_dev)
1362 return netdev_dev->netdev_class->type;
1365 /* Returns the class associated with 'netdev_dev'. */
1366 const struct netdev_class *
1367 netdev_dev_get_class(const struct netdev_dev *netdev_dev)
1369 return netdev_dev->netdev_class;
1372 /* Returns the name of 'netdev_dev'.
1374 * The caller must not free the returned value. */
1376 netdev_dev_get_name(const struct netdev_dev *netdev_dev)
1378 return netdev_dev->name;
1381 /* Returns the netdev_dev with 'name' or NULL if there is none.
1383 * The caller must not free the returned value. */
1385 netdev_dev_from_name(const char *name)
1387 return shash_find_data(&netdev_dev_shash, name);
1390 /* Fills 'device_list' with devices that match 'netdev_class'.
1392 * The caller is responsible for initializing and destroying 'device_list'
1393 * but the contained netdev_devs must not be freed. */
1395 netdev_dev_get_devices(const struct netdev_class *netdev_class,
1396 struct shash *device_list)
1398 struct shash_node *node;
1399 SHASH_FOR_EACH (node, &netdev_dev_shash) {
1400 struct netdev_dev *dev = node->data;
1402 if (dev->netdev_class == netdev_class) {
1403 shash_add(device_list, node->name, node->data);
1408 /* Initializes 'netdev' as a instance of the netdev_dev.
1410 * This function adds 'netdev' to a netdev-owned linked list, so it is very
1411 * important that 'netdev' only be freed after calling netdev_close(). */
1413 netdev_init(struct netdev *netdev, struct netdev_dev *netdev_dev)
1415 memset(netdev, 0, sizeof *netdev);
1416 netdev->netdev_dev = netdev_dev;
1417 list_push_back(&netdev_list, &netdev->node);
1420 /* Undoes the results of initialization.
1422 * Normally this function only needs to be called from netdev_close().
1423 * However, it may be called by providers due to an error on opening
1424 * that occurs after initialization. It this case netdev_close() would
1425 * never be called. */
1427 netdev_uninit(struct netdev *netdev, bool close)
1429 /* Restore flags that we changed, if any. */
1430 int error = restore_flags(netdev);
1431 list_remove(&netdev->node);
1433 VLOG_WARN("failed to restore network device flags on %s: %s",
1434 netdev_get_name(netdev), strerror(error));
1438 netdev_get_dev(netdev)->netdev_class->close(netdev);
1443 /* Returns the class type of 'netdev'.
1445 * The caller must not free the returned value. */
1447 netdev_get_type(const struct netdev *netdev)
1449 return netdev_get_dev(netdev)->netdev_class->type;
1453 netdev_get_dev(const struct netdev *netdev)
1455 return netdev->netdev_dev;
1458 /* Initializes 'notifier' as a netdev notifier for 'netdev', for which
1459 * notification will consist of calling 'cb', with auxiliary data 'aux'. */
1461 netdev_notifier_init(struct netdev_notifier *notifier, struct netdev *netdev,
1462 void (*cb)(struct netdev_notifier *), void *aux)
1464 notifier->netdev = netdev;
1466 notifier->aux = aux;
1469 /* Tracks changes in the status of a set of network devices. */
1470 struct netdev_monitor {
1471 struct shash polled_netdevs;
1472 struct shash changed_netdevs;
1475 /* Creates and returns a new structure for monitor changes in the status of
1476 * network devices. */
1477 struct netdev_monitor *
1478 netdev_monitor_create(void)
1480 struct netdev_monitor *monitor = xmalloc(sizeof *monitor);
1481 shash_init(&monitor->polled_netdevs);
1482 shash_init(&monitor->changed_netdevs);
1486 /* Destroys 'monitor'. */
1488 netdev_monitor_destroy(struct netdev_monitor *monitor)
1491 struct shash_node *node;
1493 SHASH_FOR_EACH (node, &monitor->polled_netdevs) {
1494 struct netdev_notifier *notifier = node->data;
1495 netdev_get_dev(notifier->netdev)->netdev_class->poll_remove(
1499 shash_destroy(&monitor->polled_netdevs);
1500 shash_destroy(&monitor->changed_netdevs);
1506 netdev_monitor_cb(struct netdev_notifier *notifier)
1508 struct netdev_monitor *monitor = notifier->aux;
1509 const char *name = netdev_get_name(notifier->netdev);
1510 shash_add_once(&monitor->changed_netdevs, name, NULL);
1513 /* Attempts to add 'netdev' as a netdev monitored by 'monitor'. Returns 0 if
1514 * successful, otherwise a positive errno value.
1516 * Adding a given 'netdev' to a monitor multiple times is equivalent to adding
1519 netdev_monitor_add(struct netdev_monitor *monitor, struct netdev *netdev)
1521 const char *netdev_name = netdev_get_name(netdev);
1523 if (!shash_find(&monitor->polled_netdevs, netdev_name)
1524 && netdev_get_dev(netdev)->netdev_class->poll_add)
1526 struct netdev_notifier *notifier;
1527 error = netdev_get_dev(netdev)->netdev_class->poll_add(netdev,
1528 netdev_monitor_cb, monitor, ¬ifier);
1530 assert(notifier->netdev == netdev);
1531 shash_add(&monitor->polled_netdevs, netdev_name, notifier);
1537 /* Removes 'netdev' from the set of netdevs monitored by 'monitor'. (This has
1538 * no effect if 'netdev' is not in the set of devices monitored by
1541 netdev_monitor_remove(struct netdev_monitor *monitor, struct netdev *netdev)
1543 const char *netdev_name = netdev_get_name(netdev);
1544 struct shash_node *node;
1546 node = shash_find(&monitor->polled_netdevs, netdev_name);
1548 /* Cancel future notifications. */
1549 struct netdev_notifier *notifier = node->data;
1550 netdev_get_dev(netdev)->netdev_class->poll_remove(notifier);
1551 shash_delete(&monitor->polled_netdevs, node);
1553 /* Drop any pending notification. */
1554 node = shash_find(&monitor->changed_netdevs, netdev_name);
1556 shash_delete(&monitor->changed_netdevs, node);
1561 /* Checks for changes to netdevs in the set monitored by 'monitor'. If any of
1562 * the attributes (Ethernet address, carrier status, speed or peer-advertised
1563 * speed, flags, etc.) of a network device monitored by 'monitor' has changed,
1564 * sets '*devnamep' to the name of a device that has changed and returns 0.
1565 * The caller is responsible for freeing '*devnamep' (with free()).
1567 * If no devices have changed, sets '*devnamep' to NULL and returns EAGAIN.
1570 netdev_monitor_poll(struct netdev_monitor *monitor, char **devnamep)
1572 struct shash_node *node = shash_first(&monitor->changed_netdevs);
1577 *devnamep = xstrdup(node->name);
1578 shash_delete(&monitor->changed_netdevs, node);
1583 /* Registers with the poll loop to wake up from the next call to poll_block()
1584 * when netdev_monitor_poll(monitor) would indicate that a device has
1587 netdev_monitor_poll_wait(const struct netdev_monitor *monitor)
1589 if (!shash_is_empty(&monitor->changed_netdevs)) {
1590 poll_immediate_wake();
1592 /* XXX Nothing needed here for netdev_linux, but maybe other netdev
1593 * classes need help. */
1597 /* Restore the network device flags on 'netdev' to those that were active
1598 * before we changed them. Returns 0 if successful, otherwise a positive
1601 * To avoid reentry, the caller must ensure that fatal signals are blocked. */
1603 restore_flags(struct netdev *netdev)
1605 if (netdev->changed_flags) {
1606 enum netdev_flags restore = netdev->save_flags & netdev->changed_flags;
1607 enum netdev_flags old_flags;
1608 return netdev_get_dev(netdev)->netdev_class->update_flags(netdev,
1609 netdev->changed_flags & ~restore,
1610 restore, &old_flags);
1615 /* Close all netdevs on shutdown so they can do any needed cleanup such as
1616 * destroying devices, restoring flags, etc. */
1618 close_all_netdevs(void *aux OVS_UNUSED)
1620 struct netdev *netdev, *next;
1621 LIST_FOR_EACH_SAFE(netdev, next, struct netdev, node, &netdev_list) {
1622 netdev_close(netdev);