2 * Copyright (c) 2011, 2013, 2014 Gaetano Catalli.
3 * Copyright (c) 2013, 2014 YAMAMOTO Takashi.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #if !defined(__MACH__)
21 #include "netdev-provider.h"
25 #include <sys/types.h>
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
29 #include <sys/sockio.h>
32 #include <pcap/pcap.h>
34 #include <net/if_dl.h>
35 #include <net/if_media.h>
36 #include <net/if_tap.h>
37 #include <netinet/in.h>
38 #ifdef HAVE_NET_IF_MIB_H
39 #include <net/if_mib.h>
44 #include <sys/sysctl.h>
45 #if defined(__NetBSD__)
46 #include <net/route.h>
47 #include <netinet/if_inarp.h>
52 #include "dp-packet.h"
53 #include "dpif-netdev.h"
54 #include "openvswitch/dynamic-string.h"
55 #include "fatal-signal.h"
56 #include "openflow/openflow.h"
57 #include "ovs-thread.h"
59 #include "poll-loop.h"
61 #include "socket-util.h"
64 #include "openvswitch/vlog.h"
66 VLOG_DEFINE_THIS_MODULE(netdev_bsd);
69 struct netdev_rxq_bsd {
72 /* Packet capture descriptor for a system network device.
73 * For a tap device this is NULL. */
76 /* Selectable file descriptor for the network device.
77 * This descriptor will be used for polling operations. */
84 /* Never changes after initialization. */
87 /* Protects all members below. */
88 struct ovs_mutex mutex;
90 unsigned int cache_valid;
93 struct eth_addr etheraddr;
97 int tap_fd; /* TAP character device, if any, otherwise -1. */
99 /* Used for sending packets on non-tap devices. */
106 VALID_IFINDEX = 1 << 0,
107 VALID_ETHERADDR = 1 << 1,
110 VALID_CARRIER = 1 << 4
113 #define PCAP_SNAPLEN 2048
117 * Notifier used to invalidate device informations in case of status change.
119 * It will be registered with a 'rtbsd_notifier_register()' when the first
120 * device will be created with the call of either 'netdev_bsd_tap_create()' or
121 * 'netdev_bsd_system_create()'.
123 * The callback associated with this notifier ('netdev_bsd_cache_cb()') will
124 * invalidate cached information about the device.
126 static struct rtbsd_notifier netdev_bsd_cache_notifier;
127 static int cache_notifier_refcount;
129 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
131 static void destroy_tap(int fd, const char *name);
132 static int get_flags(const struct netdev *, int *flagsp);
133 static int set_flags(const char *, int flags);
134 static int do_set_addr(struct netdev *netdev,
135 unsigned long ioctl_nr, const char *ioctl_name,
136 struct in_addr addr);
137 static int get_etheraddr(const char *netdev_name, struct eth_addr *ea);
138 static int set_etheraddr(const char *netdev_name, int hwaddr_family,
139 int hwaddr_len, const struct eth_addr);
140 static int get_ifindex(const struct netdev *, int *ifindexp);
142 static int ifr_get_flags(const struct ifreq *);
143 static void ifr_set_flags(struct ifreq *, int flags);
146 static int af_link_ioctl(unsigned long command, const void *arg);
149 static void netdev_bsd_run(void);
150 static int netdev_bsd_get_mtu(const struct netdev *netdev_, int *mtup);
153 is_netdev_bsd_class(const struct netdev_class *netdev_class)
155 return netdev_class->run == netdev_bsd_run;
158 static struct netdev_bsd *
159 netdev_bsd_cast(const struct netdev *netdev)
161 ovs_assert(is_netdev_bsd_class(netdev_get_class(netdev)));
162 return CONTAINER_OF(netdev, struct netdev_bsd, up);
165 static struct netdev_rxq_bsd *
166 netdev_rxq_bsd_cast(const struct netdev_rxq *rxq)
168 ovs_assert(is_netdev_bsd_class(netdev_get_class(rxq->netdev)));
169 return CONTAINER_OF(rxq, struct netdev_rxq_bsd, up);
173 netdev_get_kernel_name(const struct netdev *netdev)
175 return netdev_bsd_cast(netdev)->kernel_name;
179 * Perform periodic work needed by netdev. In BSD netdevs it checks for any
180 * interface status changes, and eventually calls all the user callbacks.
185 rtbsd_notifier_run();
189 * Arranges for poll_block() to wake up if the "run" member function needs to
193 netdev_bsd_wait(void)
195 rtbsd_notifier_wait();
198 /* Invalidate cache in case of interface status change. */
200 netdev_bsd_cache_cb(const struct rtbsd_change *change,
201 void *aux OVS_UNUSED)
203 struct netdev_bsd *dev;
206 struct netdev *base_dev = netdev_from_name(change->if_name);
209 const struct netdev_class *netdev_class =
210 netdev_get_class(base_dev);
212 if (is_netdev_bsd_class(netdev_class)) {
213 dev = netdev_bsd_cast(base_dev);
214 dev->cache_valid = 0;
215 netdev_change_seq_changed(base_dev);
217 netdev_close(base_dev);
221 * XXX the API is lacking, we should be able to iterate on the list of
222 * netdevs without having to store the info in a temp shash.
224 struct shash device_shash;
225 struct shash_node *node;
227 shash_init(&device_shash);
228 netdev_get_devices(&netdev_bsd_class, &device_shash);
229 SHASH_FOR_EACH (node, &device_shash) {
230 struct netdev *netdev = node->data;
231 dev = netdev_bsd_cast(netdev);
232 dev->cache_valid = 0;
233 netdev_change_seq_changed(netdev);
234 netdev_close(netdev);
236 shash_destroy(&device_shash);
241 cache_notifier_ref(void)
245 if (!cache_notifier_refcount) {
246 ret = rtbsd_notifier_register(&netdev_bsd_cache_notifier,
247 netdev_bsd_cache_cb, NULL);
252 cache_notifier_refcount++;
257 cache_notifier_unref(void)
259 cache_notifier_refcount--;
260 if (cache_notifier_refcount == 0) {
261 rtbsd_notifier_unregister(&netdev_bsd_cache_notifier);
266 static struct netdev *
267 netdev_bsd_alloc(void)
269 struct netdev_bsd *netdev = xzalloc(sizeof *netdev);
274 netdev_bsd_construct_system(struct netdev *netdev_)
276 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
277 enum netdev_flags flags;
280 error = cache_notifier_ref();
285 ovs_mutex_init(&netdev->mutex);
287 netdev->kernel_name = xstrdup(netdev_->name);
289 /* Verify that the netdev really exists by attempting to read its flags */
290 error = netdev_get_flags(netdev_, &flags);
291 if (error == ENXIO) {
292 free(netdev->kernel_name);
293 cache_notifier_unref();
294 ovs_mutex_destroy(&netdev->mutex);
302 netdev_bsd_construct_tap(struct netdev *netdev_)
304 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
305 const char *name = netdev_->name;
308 char *kernel_name = NULL;
310 error = cache_notifier_ref();
315 memset(&ifr, 0, sizeof(ifr));
317 /* Create a tap device by opening /dev/tap. The TAPGIFNAME ioctl is used
318 * to retrieve the name of the tap device. */
319 ovs_mutex_init(&netdev->mutex);
320 netdev->tap_fd = open("/dev/tap", O_RDWR);
321 if (netdev->tap_fd < 0) {
323 VLOG_WARN("opening \"/dev/tap\" failed: %s", ovs_strerror(error));
324 goto error_unref_notifier;
327 /* Retrieve tap name (e.g. tap0) */
328 if (ioctl(netdev->tap_fd, TAPGIFNAME, &ifr) == -1) {
329 /* XXX Need to destroy the device? */
331 close(netdev->tap_fd);
332 goto error_unref_notifier;
335 /* Change the name of the tap device */
336 #if defined(SIOCSIFNAME)
337 ifr.ifr_data = (void *)name;
338 error = af_inet_ioctl(SIOCSIFNAME, &ifr);
340 destroy_tap(netdev->tap_fd, ifr.ifr_name);
341 goto error_unref_notifier;
343 kernel_name = xstrdup(name);
346 * NetBSD doesn't support inteface renaming.
348 VLOG_INFO("tap %s is created for bridge %s", ifr.ifr_name, name);
349 kernel_name = xstrdup(ifr.ifr_name);
352 /* set non-blocking. */
353 error = set_nonblocking(netdev->tap_fd);
355 destroy_tap(netdev->tap_fd, kernel_name);
356 goto error_unref_notifier;
360 ifr_set_flags(&ifr, IFF_UP);
361 ovs_strlcpy(ifr.ifr_name, kernel_name, sizeof ifr.ifr_name);
362 error = af_inet_ioctl(SIOCSIFFLAGS, &ifr);
364 destroy_tap(netdev->tap_fd, kernel_name);
365 goto error_unref_notifier;
368 netdev->kernel_name = kernel_name;
372 error_unref_notifier:
373 ovs_mutex_destroy(&netdev->mutex);
374 cache_notifier_unref();
381 netdev_bsd_destruct(struct netdev *netdev_)
383 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
385 cache_notifier_unref();
387 if (netdev->tap_fd >= 0) {
388 destroy_tap(netdev->tap_fd, netdev_get_kernel_name(netdev_));
391 pcap_close(netdev->pcap);
393 free(netdev->kernel_name);
394 ovs_mutex_destroy(&netdev->mutex);
398 netdev_bsd_dealloc(struct netdev *netdev_)
400 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
406 netdev_bsd_open_pcap(const char *name, pcap_t **pcapp, int *fdp)
408 char errbuf[PCAP_ERRBUF_SIZE];
414 /* Open the pcap device. The device is opened in non-promiscuous mode
415 * because the interface flags are manually set by the caller. */
417 pcap = pcap_open_live(name, PCAP_SNAPLEN, 0, 1000, errbuf);
419 VLOG_ERR_RL(&rl, "%s: pcap_open_live failed: %s", name, errbuf);
423 if (errbuf[0] != '\0') {
424 VLOG_WARN_RL(&rl, "%s: pcap_open_live: %s", name, errbuf);
427 /* Get the underlying fd. */
428 fd = pcap_get_selectable_fd(pcap);
430 VLOG_WARN_RL(&rl, "%s: no selectable file descriptor", name);
435 /* Set non-blocking mode. Also the BIOCIMMEDIATE ioctl must be called
436 * on the file descriptor returned by pcap_get_selectable_fd to achieve
437 * a real non-blocking behaviour.*/
438 error = pcap_setnonblock(pcap, 1, errbuf);
444 /* This call assure that reads return immediately upon packet
445 * reception. Otherwise, a read will block until either the kernel
446 * buffer becomes full or a timeout occurs. */
447 if (ioctl(fd, BIOCIMMEDIATE, &one) < 0 ) {
448 VLOG_ERR_RL(&rl, "ioctl(BIOCIMMEDIATE) on %s device failed: %s",
449 name, ovs_strerror(errno));
454 /* Capture only incoming packets. */
455 error = pcap_setdirection(pcap, PCAP_D_IN);
474 static struct netdev_rxq *
475 netdev_bsd_rxq_alloc(void)
477 struct netdev_rxq_bsd *rxq = xzalloc(sizeof *rxq);
482 netdev_bsd_rxq_construct(struct netdev_rxq *rxq_)
484 struct netdev_rxq_bsd *rxq = netdev_rxq_bsd_cast(rxq_);
485 struct netdev *netdev_ = rxq->up.netdev;
486 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
489 if (!strcmp(netdev_get_type(netdev_), "tap")) {
490 rxq->pcap_handle = NULL;
491 rxq->fd = netdev->tap_fd;
494 ovs_mutex_lock(&netdev->mutex);
495 error = netdev_bsd_open_pcap(netdev_get_kernel_name(netdev_),
496 &rxq->pcap_handle, &rxq->fd);
497 ovs_mutex_unlock(&netdev->mutex);
504 netdev_bsd_rxq_destruct(struct netdev_rxq *rxq_)
506 struct netdev_rxq_bsd *rxq = netdev_rxq_bsd_cast(rxq_);
508 if (rxq->pcap_handle) {
509 pcap_close(rxq->pcap_handle);
514 netdev_bsd_rxq_dealloc(struct netdev_rxq *rxq_)
516 struct netdev_rxq_bsd *rxq = netdev_rxq_bsd_cast(rxq_);
521 /* The recv callback of the netdev class returns the number of bytes of the
524 * This can be done by the pcap_next() function. Unfortunately pcap_next() does
525 * not make difference between a missing packet on the capture interface and
526 * an error during the file capture. We can use the pcap_dispatch() function
527 * instead, which is able to distinguish between errors and null packet.
529 * To make pcap_dispatch() returns the number of bytes read from the interface
530 * we need to define the following callback and argument.
539 * This callback will be executed on every captured packet.
541 * If the packet captured by pcap_dispatch() does not fit the pcap buffer,
542 * pcap returns a truncated packet and we follow this behavior.
544 * The argument args->retval is the packet size in bytes.
547 proc_pkt(u_char *args_, const struct pcap_pkthdr *hdr, const u_char *packet)
549 struct pcap_arg *args = ALIGNED_CAST(struct pcap_arg *, args_);
551 if (args->size < hdr->len) {
552 VLOG_WARN_RL(&rl, "packet truncated");
553 args->retval = args->size;
555 args->retval = hdr->len;
558 /* copy the packet to our buffer */
559 memcpy(args->data, packet, args->retval);
563 * This function attempts to receive a packet from the specified network
564 * device. It is assumed that the network device is a system device or a tap
565 * device opened as a system one. In this case the read operation is performed
569 netdev_rxq_bsd_recv_pcap(struct netdev_rxq_bsd *rxq, struct dp_packet *buffer)
574 /* prepare the pcap argument to store the packet */
575 arg.size = dp_packet_tailroom(buffer);
576 arg.data = dp_packet_data(buffer);
579 ret = pcap_dispatch(rxq->pcap_handle, 1, proc_pkt, (u_char *) &arg);
582 dp_packet_set_size(buffer, dp_packet_size(buffer) + arg.retval);
586 if (errno == EINTR) {
596 * This function attempts to receive a packet from the specified network
597 * device. It is assumed that the network device is a tap device and
598 * 'rxq->fd' is initialized with the tap file descriptor.
601 netdev_rxq_bsd_recv_tap(struct netdev_rxq_bsd *rxq, struct dp_packet *buffer)
603 size_t size = dp_packet_tailroom(buffer);
606 ssize_t retval = read(rxq->fd, dp_packet_data(buffer), size);
608 dp_packet_set_size(buffer, dp_packet_size(buffer) + retval);
610 } else if (errno != EINTR) {
611 if (errno != EAGAIN) {
612 VLOG_WARN_RL(&rl, "error receiving Ethernet packet on %s: %s",
613 ovs_strerror(errno), netdev_rxq_get_name(&rxq->up));
621 netdev_bsd_rxq_recv(struct netdev_rxq *rxq_, struct dp_packet **packets,
624 struct netdev_rxq_bsd *rxq = netdev_rxq_bsd_cast(rxq_);
625 struct netdev *netdev = rxq->up.netdev;
626 struct dp_packet *packet;
630 if (netdev_bsd_get_mtu(netdev, &mtu)) {
631 mtu = ETH_PAYLOAD_MAX;
634 packet = dp_packet_new_with_headroom(VLAN_ETH_HEADER_LEN + mtu,
636 retval = (rxq->pcap_handle
637 ? netdev_rxq_bsd_recv_pcap(rxq, packet)
638 : netdev_rxq_bsd_recv_tap(rxq, packet));
641 dp_packet_delete(packet);
643 dp_packet_pad(packet);
651 * Registers with the poll loop to wake up from the next call to poll_block()
652 * when a packet is ready to be received with netdev_rxq_recv() on 'rxq'.
655 netdev_bsd_rxq_wait(struct netdev_rxq *rxq_)
657 struct netdev_rxq_bsd *rxq = netdev_rxq_bsd_cast(rxq_);
659 poll_fd_wait(rxq->fd, POLLIN);
662 /* Discards all packets waiting to be received from 'rxq'. */
664 netdev_bsd_rxq_drain(struct netdev_rxq *rxq_)
667 struct netdev_rxq_bsd *rxq = netdev_rxq_bsd_cast(rxq_);
669 strcpy(ifr.ifr_name, netdev_get_kernel_name(netdev_rxq_get_netdev(rxq_)));
670 if (ioctl(rxq->fd, BIOCFLUSH, &ifr) == -1) {
671 VLOG_DBG_RL(&rl, "%s: ioctl(BIOCFLUSH) failed: %s",
672 netdev_rxq_get_name(rxq_), ovs_strerror(errno));
679 * Send a packet on the specified network device. The device could be either a
680 * system or a tap device.
683 netdev_bsd_send(struct netdev *netdev_, int qid OVS_UNUSED,
684 struct dp_packet **pkts, int cnt, bool may_steal)
686 struct netdev_bsd *dev = netdev_bsd_cast(netdev_);
687 const char *name = netdev_get_name(netdev_);
691 ovs_mutex_lock(&dev->mutex);
692 if (dev->tap_fd < 0 && !dev->pcap) {
693 error = netdev_bsd_open_pcap(name, &dev->pcap, &dev->fd);
698 for (i = 0; i < cnt; i++) {
699 const void *data = dp_packet_data(pkts[i]);
700 size_t size = dp_packet_size(pkts[i]);
702 /* Truncate the packet if it is configured. */
703 size -= dp_packet_get_cutlen(pkts[i]);
707 if (dev->tap_fd >= 0) {
708 retval = write(dev->tap_fd, data, size);
710 retval = pcap_inject(dev->pcap, data, size);
713 if (errno == EINTR) {
717 if (error != EAGAIN) {
718 VLOG_WARN_RL(&rl, "error sending Ethernet packet on"
719 " %s: %s", name, ovs_strerror(error));
722 } else if (retval != size) {
723 VLOG_WARN_RL(&rl, "sent partial Ethernet packet "
724 "(%"PRIuSIZE" bytes of "
725 "%"PRIuSIZE") on %s", retval, size, name);
733 ovs_mutex_unlock(&dev->mutex);
735 for (i = 0; i < cnt; i++) {
736 dp_packet_delete(pkts[i]);
744 * Registers with the poll loop to wake up from the next call to poll_block()
745 * when the packet transmission queue has sufficient room to transmit a packet
746 * with netdev_send().
749 netdev_bsd_send_wait(struct netdev *netdev_, int qid OVS_UNUSED)
751 struct netdev_bsd *dev = netdev_bsd_cast(netdev_);
753 ovs_mutex_lock(&dev->mutex);
754 if (dev->tap_fd >= 0) {
755 /* TAP device always accepts packets. */
756 poll_immediate_wake();
757 } else if (dev->pcap) {
758 poll_fd_wait(dev->fd, POLLOUT);
760 /* We haven't even tried to send a packet yet. */
761 poll_immediate_wake();
763 ovs_mutex_unlock(&dev->mutex);
767 * Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
768 * otherwise a positive errno value.
771 netdev_bsd_set_etheraddr(struct netdev *netdev_,
772 const struct eth_addr mac)
774 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
777 ovs_mutex_lock(&netdev->mutex);
778 if (!(netdev->cache_valid & VALID_ETHERADDR)
779 || !eth_addr_equals(netdev->etheraddr, mac)) {
780 error = set_etheraddr(netdev_get_kernel_name(netdev_), AF_LINK,
783 netdev->cache_valid |= VALID_ETHERADDR;
784 netdev->etheraddr = mac;
785 netdev_change_seq_changed(netdev_);
788 ovs_mutex_unlock(&netdev->mutex);
794 * Returns a pointer to 'netdev''s MAC address. The caller must not modify or
795 * free the returned buffer.
798 netdev_bsd_get_etheraddr(const struct netdev *netdev_, struct eth_addr *mac)
800 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
803 ovs_mutex_lock(&netdev->mutex);
804 if (!(netdev->cache_valid & VALID_ETHERADDR)) {
805 error = get_etheraddr(netdev_get_kernel_name(netdev_),
808 netdev->cache_valid |= VALID_ETHERADDR;
812 *mac = netdev->etheraddr;
814 ovs_mutex_unlock(&netdev->mutex);
820 * Returns the maximum size of transmitted (and received) packets on 'netdev',
821 * in bytes, not including the hardware header; thus, this is typically 1500
822 * bytes for Ethernet devices.
825 netdev_bsd_get_mtu(const struct netdev *netdev_, int *mtup)
827 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
830 ovs_mutex_lock(&netdev->mutex);
831 if (!(netdev->cache_valid & VALID_MTU)) {
834 error = af_inet_ifreq_ioctl(netdev_get_kernel_name(netdev_), &ifr,
835 SIOCGIFMTU, "SIOCGIFMTU");
837 netdev->mtu = ifr.ifr_mtu;
838 netdev->cache_valid |= VALID_MTU;
844 ovs_mutex_unlock(&netdev->mutex);
850 netdev_bsd_get_ifindex(const struct netdev *netdev_)
852 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
855 ovs_mutex_lock(&netdev->mutex);
856 error = get_ifindex(netdev_, &ifindex);
857 ovs_mutex_unlock(&netdev->mutex);
859 return error ? -error : ifindex;
863 netdev_bsd_get_carrier(const struct netdev *netdev_, bool *carrier)
865 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
868 ovs_mutex_lock(&netdev->mutex);
869 if (!(netdev->cache_valid & VALID_CARRIER)) {
870 struct ifmediareq ifmr;
872 memset(&ifmr, 0, sizeof(ifmr));
873 ovs_strlcpy(ifmr.ifm_name, netdev_get_kernel_name(netdev_),
874 sizeof ifmr.ifm_name);
876 error = af_inet_ioctl(SIOCGIFMEDIA, &ifmr);
878 netdev->carrier = (ifmr.ifm_status & IFM_ACTIVE) == IFM_ACTIVE;
879 netdev->cache_valid |= VALID_CARRIER;
881 /* If the interface doesn't report whether the media is active,
882 * just assume it is active. */
883 if ((ifmr.ifm_status & IFM_AVALID) == 0) {
884 netdev->carrier = true;
887 VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFMEDIA) failed: %s",
888 netdev_get_name(netdev_), ovs_strerror(error));
892 *carrier = netdev->carrier;
894 ovs_mutex_unlock(&netdev->mutex);
900 convert_stats_system(struct netdev_stats *stats, const struct if_data *ifd)
903 * note: UINT64_MAX means unsupported
905 stats->rx_packets = ifd->ifi_ipackets;
906 stats->tx_packets = ifd->ifi_opackets;
907 stats->rx_bytes = ifd->ifi_obytes;
908 stats->tx_bytes = ifd->ifi_ibytes;
909 stats->rx_errors = ifd->ifi_ierrors;
910 stats->tx_errors = ifd->ifi_oerrors;
911 stats->rx_dropped = ifd->ifi_iqdrops;
912 stats->tx_dropped = UINT64_MAX;
913 stats->multicast = ifd->ifi_imcasts;
914 stats->collisions = ifd->ifi_collisions;
915 stats->rx_length_errors = UINT64_MAX;
916 stats->rx_over_errors = UINT64_MAX;
917 stats->rx_crc_errors = UINT64_MAX;
918 stats->rx_frame_errors = UINT64_MAX;
919 stats->rx_fifo_errors = UINT64_MAX;
920 stats->rx_missed_errors = UINT64_MAX;
921 stats->tx_aborted_errors = UINT64_MAX;
922 stats->tx_carrier_errors = UINT64_MAX;
923 stats->tx_fifo_errors = UINT64_MAX;
924 stats->tx_heartbeat_errors = UINT64_MAX;
925 stats->tx_window_errors = UINT64_MAX;
929 convert_stats_tap(struct netdev_stats *stats, const struct if_data *ifd)
932 * Similar to convert_stats_system but swapping rxq and tx
933 * because 'ifd' is stats for the network interface side of the
934 * tap device and what the caller wants is one for the character
937 * note: UINT64_MAX means unsupported
939 stats->rx_packets = ifd->ifi_opackets;
940 stats->tx_packets = ifd->ifi_ipackets;
941 stats->rx_bytes = ifd->ifi_ibytes;
942 stats->tx_bytes = ifd->ifi_obytes;
943 stats->rx_errors = ifd->ifi_oerrors;
944 stats->tx_errors = ifd->ifi_ierrors;
945 stats->rx_dropped = UINT64_MAX;
946 stats->tx_dropped = ifd->ifi_iqdrops;
947 stats->multicast = ifd->ifi_omcasts;
948 stats->collisions = UINT64_MAX;
949 stats->rx_length_errors = UINT64_MAX;
950 stats->rx_over_errors = UINT64_MAX;
951 stats->rx_crc_errors = UINT64_MAX;
952 stats->rx_frame_errors = UINT64_MAX;
953 stats->rx_fifo_errors = UINT64_MAX;
954 stats->rx_missed_errors = UINT64_MAX;
955 stats->tx_aborted_errors = UINT64_MAX;
956 stats->tx_carrier_errors = UINT64_MAX;
957 stats->tx_fifo_errors = UINT64_MAX;
958 stats->tx_heartbeat_errors = UINT64_MAX;
959 stats->tx_window_errors = UINT64_MAX;
963 convert_stats(const struct netdev *netdev, struct netdev_stats *stats,
964 const struct if_data *ifd)
966 if (netdev_bsd_cast(netdev)->tap_fd == -1) {
967 convert_stats_system(stats, ifd);
969 convert_stats_tap(stats, ifd);
973 /* Retrieves current device stats for 'netdev'. */
975 netdev_bsd_get_stats(const struct netdev *netdev_, struct netdev_stats *stats)
977 #if defined(__FreeBSD__)
981 struct ifmibdata ifmd;
986 mib[2] = NETLINK_GENERIC;
987 mib[3] = IFMIB_SYSTEM;
988 mib[4] = IFMIB_IFCOUNT;
990 len = sizeof(if_count);
992 if (sysctl(mib, 5, &if_count, &len, (void *)0, 0) == -1) {
993 VLOG_DBG_RL(&rl, "%s: sysctl failed: %s",
994 netdev_get_name(netdev_), ovs_strerror(errno));
998 mib[5] = IFDATA_GENERAL;
999 mib[3] = IFMIB_IFDATA;
1001 for (i = 1; i <= if_count; i++) {
1003 if (sysctl(mib, 6, &ifmd, &len, (void *)0, 0) == -1) {
1004 VLOG_DBG_RL(&rl, "%s: sysctl failed: %s",
1005 netdev_get_name(netdev_), ovs_strerror(errno));
1007 } else if (!strcmp(ifmd.ifmd_name, netdev_get_name(netdev_))) {
1008 convert_stats(netdev_, stats, &ifmd.ifmd_data);
1014 #elif defined(__NetBSD__)
1015 struct ifdatareq ifdr;
1018 memset(&ifdr, 0, sizeof(ifdr));
1019 ovs_strlcpy(ifdr.ifdr_name, netdev_get_kernel_name(netdev_),
1020 sizeof(ifdr.ifdr_name));
1021 error = af_link_ioctl(SIOCGIFDATA, &ifdr);
1023 convert_stats(netdev_, stats, &ifdr.ifdr_data);
1027 #error not implemented
1032 netdev_bsd_parse_media(int media)
1034 uint32_t supported = 0;
1035 bool half_duplex = media & IFM_HDX ? true : false;
1037 switch (IFM_SUBTYPE(media)) {
1042 supported |= half_duplex ? NETDEV_F_10MB_HD : NETDEV_F_10MB_FD;
1043 supported |= NETDEV_F_COPPER;
1047 supported |= half_duplex ? NETDEV_F_10MB_HD : NETDEV_F_10MB_FD;
1048 supported |= NETDEV_F_FIBER;
1055 supported |= half_duplex ? NETDEV_F_100MB_HD : NETDEV_F_100MB_FD;
1056 supported |= NETDEV_F_COPPER;
1060 supported |= half_duplex ? NETDEV_F_100MB_HD : NETDEV_F_100MB_FD;
1061 supported |= NETDEV_F_FIBER;
1066 supported |= half_duplex ? NETDEV_F_1GB_HD : NETDEV_F_1GB_FD;
1067 supported |= NETDEV_F_COPPER;
1072 supported |= half_duplex ? NETDEV_F_1GB_HD : NETDEV_F_1GB_FD;
1073 supported |= NETDEV_F_FIBER;
1077 supported |= NETDEV_F_10GB_FD;
1078 supported |= NETDEV_F_COPPER;
1083 supported |= NETDEV_F_10GB_FD;
1084 supported |= NETDEV_F_FIBER;
1091 if (IFM_SUBTYPE(media) == IFM_AUTO) {
1092 supported |= NETDEV_F_AUTONEG;
1095 if (media & IFM_ETH_FMASK) {
1096 supported |= NETDEV_F_PAUSE;
1104 * Stores the features supported by 'netdev' into each of '*current',
1105 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
1106 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
1107 * successful, otherwise a positive errno value. On failure, all of the
1108 * passed-in values are set to 0.
1111 netdev_bsd_get_features(const struct netdev *netdev,
1112 enum netdev_features *current, uint32_t *advertised,
1113 enum netdev_features *supported, uint32_t *peer)
1115 struct ifmediareq ifmr;
1121 /* XXX Look into SIOCGIFCAP instead of SIOCGIFMEDIA */
1123 memset(&ifmr, 0, sizeof(ifmr));
1124 ovs_strlcpy(ifmr.ifm_name, netdev_get_name(netdev), sizeof ifmr.ifm_name);
1126 /* We make two SIOCGIFMEDIA ioctl calls. The first to determine the
1127 * number of supported modes, and a second with a buffer to retrieve
1129 error = af_inet_ioctl(SIOCGIFMEDIA, &ifmr);
1131 VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFMEDIA) failed: %s",
1132 netdev_get_name(netdev), ovs_strerror(error));
1136 media_list = xcalloc(ifmr.ifm_count, sizeof(int));
1137 ifmr.ifm_ulist = media_list;
1139 if (IFM_TYPE(ifmr.ifm_current) != IFM_ETHER) {
1140 VLOG_DBG_RL(&rl, "%s: doesn't appear to be ethernet",
1141 netdev_get_name(netdev));
1146 error = af_inet_ioctl(SIOCGIFMEDIA, &ifmr);
1148 VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFMEDIA) failed: %s",
1149 netdev_get_name(netdev), ovs_strerror(error));
1153 /* Current settings. */
1154 *current = netdev_bsd_parse_media(ifmr.ifm_active);
1156 /* Advertised features. */
1157 *advertised = netdev_bsd_parse_media(ifmr.ifm_current);
1159 /* Supported features. */
1161 for (i = 0; i < ifmr.ifm_count; i++) {
1162 *supported |= netdev_bsd_parse_media(ifmr.ifm_ulist[i]);
1165 /* Peer advertisements. */
1166 *peer = 0; /* XXX */
1175 * Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
1176 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
1177 * positive errno value.
1180 netdev_bsd_set_in4(struct netdev *netdev_, struct in_addr addr,
1181 struct in_addr mask)
1183 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
1186 ovs_mutex_lock(&netdev->mutex);
1187 error = do_set_addr(netdev_, SIOCSIFADDR, "SIOCSIFADDR", addr);
1189 if (addr.s_addr != INADDR_ANY) {
1190 error = do_set_addr(netdev_, SIOCSIFNETMASK,
1191 "SIOCSIFNETMASK", mask);
1193 netdev_change_seq_changed(netdev_);
1195 ovs_mutex_unlock(&netdev->mutex);
1201 netdev_bsd_get_addr_list(const struct netdev *netdev_,
1202 struct in6_addr **addr, struct in6_addr **mask, int *n_cnt)
1204 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
1207 if (!(netdev->cache_valid & VALID_IN)) {
1208 netdev_get_addrs_list_flush();
1210 error = netdev_get_addrs(netdev_get_name(netdev_), addr, mask, n_cnt);
1212 netdev->cache_valid |= VALID_IN;
1217 #if defined(__NetBSD__)
1219 netdev_bsd_kernel_name_to_ovs_name(const char *kernel_name)
1221 char *ovs_name = NULL;
1222 struct shash device_shash;
1223 struct shash_node *node;
1225 shash_init(&device_shash);
1226 netdev_get_devices(&netdev_tap_class, &device_shash);
1227 SHASH_FOR_EACH(node, &device_shash) {
1228 struct netdev *netdev = node->data;
1229 struct netdev_bsd * const dev = netdev_bsd_cast(netdev);
1231 if (!strcmp(dev->kernel_name, kernel_name)) {
1233 ovs_name = xstrdup(netdev_get_name(&dev->up));
1235 netdev_close(netdev);
1237 shash_destroy(&device_shash);
1239 return ovs_name ? ovs_name : xstrdup(kernel_name);
1244 netdev_bsd_get_next_hop(const struct in_addr *host OVS_UNUSED,
1245 struct in_addr *next_hop OVS_UNUSED,
1246 char **netdev_name OVS_UNUSED)
1248 #if defined(__NetBSD__)
1250 struct sockaddr_in sin;
1251 struct sockaddr_dl sdl;
1258 struct rt_msghdr *rtm = &buf.h;
1259 const pid_t pid = getpid();
1262 bool gateway = false;
1263 char *ifname = NULL;
1266 memset(next_hop, 0, sizeof(*next_hop));
1267 *netdev_name = NULL;
1269 memset(&sin, 0, sizeof(sin));
1270 sin.sin_len = sizeof(sin);
1271 sin.sin_family = AF_INET;
1273 sin.sin_addr = *host;
1275 memset(&sdl, 0, sizeof(sdl));
1276 sdl.sdl_len = sizeof(sdl);
1277 sdl.sdl_family = AF_LINK;
1279 s = socket(PF_ROUTE, SOCK_RAW, 0);
1280 memset(&buf, 0, sizeof(buf));
1281 rtm->rtm_flags = RTF_HOST|RTF_UP;
1282 rtm->rtm_version = RTM_VERSION;
1283 rtm->rtm_addrs = RTA_DST|RTA_IFP;
1284 cp = (void *)&buf.space;
1285 memcpy(cp, &sin, sizeof(sin));
1286 RT_ADVANCE(cp, (struct sockaddr *)(void *)&sin);
1287 memcpy(cp, &sdl, sizeof(sdl));
1288 RT_ADVANCE(cp, (struct sockaddr *)(void *)&sdl);
1289 rtm->rtm_msglen = cp - (char *)(void *)rtm;
1290 rtm->rtm_seq = ++seq;
1291 rtm->rtm_type = RTM_GET;
1293 write(s, rtm, rtm->rtm_msglen);
1294 memset(&buf, 0, sizeof(buf));
1296 ssz = read(s, &buf, sizeof(buf));
1297 } while (ssz > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
1298 saved_errno = errno;
1304 return EPIPE; /* XXX */
1306 cp = (void *)&buf.space;
1307 for (i = 1; i; i <<= 1) {
1308 if ((rtm->rtm_addrs & i) != 0) {
1309 const struct sockaddr *sa = (const void *)cp;
1311 if ((i == RTA_GATEWAY) && sa->sa_family == AF_INET) {
1312 const struct sockaddr_in * const sin =
1313 ALIGNED_CAST(const struct sockaddr_in *, sa);
1315 *next_hop = sin->sin_addr;
1318 if ((i == RTA_IFP) && sa->sa_family == AF_LINK) {
1319 const struct sockaddr_dl * const sdl =
1320 ALIGNED_CAST(const struct sockaddr_dl *, sa);
1323 kernel_name = xmemdup0(sdl->sdl_data, sdl->sdl_nlen);
1324 ifname = netdev_bsd_kernel_name_to_ovs_name(kernel_name);
1330 if (ifname == NULL) {
1336 *netdev_name = ifname;
1337 VLOG_DBG("host " IP_FMT " next-hop " IP_FMT " if %s",
1338 IP_ARGS(host->s_addr), IP_ARGS(next_hop->s_addr), *netdev_name);
1346 netdev_bsd_arp_lookup(const struct netdev *netdev OVS_UNUSED,
1347 ovs_be32 ip OVS_UNUSED,
1348 struct eth_addr *mac OVS_UNUSED)
1350 #if defined(__NetBSD__)
1351 const struct rt_msghdr *rtm;
1364 mib[4] = NET_RT_FLAGS;
1365 mib[5] = RTF_LLINFO;
1366 if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) {
1370 buf = xmalloc(needed);
1371 if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) {
1376 for (cp = buf; cp < ep; cp += rtm->rtm_msglen) {
1377 const struct sockaddr_inarp *sina;
1378 const struct sockaddr_dl *sdl;
1380 rtm = (const void *)cp;
1381 sina = (const void *)(rtm + 1);
1382 if (ip != sina->sin_addr.s_addr) {
1385 sdl = (const void *)
1386 ((const char *)(const void *)sina + RT_ROUNDUP(sina->sin_len));
1387 if (sdl->sdl_alen == ETH_ADDR_LEN) {
1388 memcpy(mac, &sdl->sdl_data[sdl->sdl_nlen], ETH_ADDR_LEN);
1403 make_in4_sockaddr(struct sockaddr *sa, struct in_addr addr)
1405 struct sockaddr_in sin;
1406 memset(&sin, 0, sizeof sin);
1407 sin.sin_family = AF_INET;
1408 sin.sin_addr = addr;
1411 memset(sa, 0, sizeof *sa);
1412 memcpy(sa, &sin, sizeof sin);
1416 do_set_addr(struct netdev *netdev,
1417 unsigned long ioctl_nr, const char *ioctl_name,
1418 struct in_addr addr)
1421 make_in4_sockaddr(&ifr.ifr_addr, addr);
1422 return af_inet_ifreq_ioctl(netdev_get_kernel_name(netdev), &ifr, ioctl_nr,
1427 nd_to_iff_flags(enum netdev_flags nd)
1430 if (nd & NETDEV_UP) {
1433 if (nd & NETDEV_PROMISC) {
1435 #if defined(IFF_PPROMISC)
1436 iff |= IFF_PPROMISC;
1439 if (nd & NETDEV_LOOPBACK) {
1440 iff |= IFF_LOOPBACK;
1446 iff_to_nd_flags(int iff)
1448 enum netdev_flags nd = 0;
1452 if (iff & IFF_PROMISC) {
1453 nd |= NETDEV_PROMISC;
1455 if (iff & IFF_LOOPBACK) {
1456 nd |= NETDEV_LOOPBACK;
1462 netdev_bsd_update_flags(struct netdev *netdev_, enum netdev_flags off,
1463 enum netdev_flags on, enum netdev_flags *old_flagsp)
1465 int old_flags, new_flags;
1468 error = get_flags(netdev_, &old_flags);
1470 *old_flagsp = iff_to_nd_flags(old_flags);
1471 new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
1472 if (new_flags != old_flags) {
1473 error = set_flags(netdev_get_kernel_name(netdev_), new_flags);
1474 netdev_change_seq_changed(netdev_);
1480 /* Linux has also different GET_STATS, SET_STATS,
1483 #define NETDEV_BSD_CLASS(NAME, CONSTRUCT, \
1487 false, /* is_pmd */ \
1494 netdev_bsd_destruct, \
1495 netdev_bsd_dealloc, \
1496 NULL, /* get_config */ \
1497 NULL, /* set_config */ \
1498 NULL, /* get_tunnel_config */ \
1499 NULL, /* build header */ \
1500 NULL, /* push header */ \
1501 NULL, /* pop header */ \
1502 NULL, /* get_numa_id */ \
1503 NULL, /* set_tx_multiq */ \
1506 netdev_bsd_send_wait, \
1508 netdev_bsd_set_etheraddr, \
1509 netdev_bsd_get_etheraddr, \
1510 netdev_bsd_get_mtu, \
1511 NULL, /* set_mtu */ \
1512 netdev_bsd_get_ifindex, \
1513 netdev_bsd_get_carrier, \
1514 NULL, /* get_carrier_resets */ \
1515 NULL, /* set_miimon_interval */ \
1516 netdev_bsd_get_stats, \
1519 NULL, /* set_advertisement */ \
1520 NULL, /* set_policing */ \
1521 NULL, /* get_qos_type */ \
1522 NULL, /* get_qos_capabilities */ \
1523 NULL, /* get_qos */ \
1524 NULL, /* set_qos */ \
1525 NULL, /* get_queue */ \
1526 NULL, /* set_queue */ \
1527 NULL, /* delete_queue */ \
1528 NULL, /* get_queue_stats */ \
1529 NULL, /* queue_dump_start */ \
1530 NULL, /* queue_dump_next */ \
1531 NULL, /* queue_dump_done */ \
1532 NULL, /* dump_queue_stats */ \
1534 netdev_bsd_set_in4, \
1535 netdev_bsd_get_addr_list, \
1536 NULL, /* add_router */ \
1537 netdev_bsd_get_next_hop, \
1538 NULL, /* get_status */ \
1539 netdev_bsd_arp_lookup, /* arp_lookup */ \
1541 netdev_bsd_update_flags, \
1542 NULL, /* reconfigure */ \
1544 netdev_bsd_rxq_alloc, \
1545 netdev_bsd_rxq_construct, \
1546 netdev_bsd_rxq_destruct, \
1547 netdev_bsd_rxq_dealloc, \
1548 netdev_bsd_rxq_recv, \
1549 netdev_bsd_rxq_wait, \
1550 netdev_bsd_rxq_drain, \
1553 const struct netdev_class netdev_bsd_class =
1556 netdev_bsd_construct_system,
1557 netdev_bsd_get_features);
1559 const struct netdev_class netdev_tap_class =
1562 netdev_bsd_construct_tap,
1563 netdev_bsd_get_features);
1567 destroy_tap(int fd, const char *name)
1572 strcpy(ifr.ifr_name, name);
1573 /* XXX What to do if this call fails? */
1574 af_inet_ioctl(SIOCIFDESTROY, &ifr);
1578 get_flags(const struct netdev *netdev, int *flags)
1583 error = af_inet_ifreq_ioctl(netdev_get_kernel_name(netdev), &ifr,
1584 SIOCGIFFLAGS, "SIOCGIFFLAGS");
1586 *flags = ifr_get_flags(&ifr);
1592 set_flags(const char *name, int flags)
1596 ifr_set_flags(&ifr, flags);
1598 return af_inet_ifreq_ioctl(name, &ifr, SIOCSIFFLAGS, "SIOCSIFFLAGS");
1602 get_ifindex(const struct netdev *netdev_, int *ifindexp)
1604 struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
1606 if (!(netdev->cache_valid & VALID_IFINDEX)) {
1607 int ifindex = if_nametoindex(netdev_get_name(netdev_));
1611 netdev->cache_valid |= VALID_IFINDEX;
1612 netdev->ifindex = ifindex;
1614 *ifindexp = netdev->ifindex;
1619 get_etheraddr(const char *netdev_name, struct eth_addr *ea)
1621 struct ifaddrs *head;
1622 struct ifaddrs *ifa;
1623 struct sockaddr_dl *sdl;
1625 if (getifaddrs(&head) != 0) {
1626 VLOG_ERR("getifaddrs on %s device failed: %s", netdev_name,
1627 ovs_strerror(errno));
1631 for (ifa = head; ifa; ifa = ifa->ifa_next) {
1632 if (ifa->ifa_addr->sa_family == AF_LINK) {
1633 if (!strcmp(ifa->ifa_name, netdev_name)) {
1634 sdl = ALIGNED_CAST(struct sockaddr_dl *, ifa->ifa_addr);
1636 memcpy(ea, LLADDR(sdl), sdl->sdl_alen);
1644 VLOG_ERR("could not find ethernet address for %s device", netdev_name);
1650 set_etheraddr(const char *netdev_name OVS_UNUSED, int hwaddr_family OVS_UNUSED,
1651 int hwaddr_len OVS_UNUSED,
1652 const struct eth_addr mac OVS_UNUSED)
1654 #if defined(__FreeBSD__)
1658 memset(&ifr, 0, sizeof ifr);
1659 ovs_strlcpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
1660 ifr.ifr_addr.sa_family = hwaddr_family;
1661 ifr.ifr_addr.sa_len = hwaddr_len;
1662 memcpy(ifr.ifr_addr.sa_data, &mac, hwaddr_len);
1663 error = af_inet_ioctl(SIOCSIFLLADDR, &ifr);
1665 VLOG_ERR("ioctl(SIOCSIFLLADDR) on %s device failed: %s",
1666 netdev_name, ovs_strerror(error));
1670 #elif defined(__NetBSD__)
1671 struct if_laddrreq req;
1672 struct sockaddr_dl *sdl;
1673 struct sockaddr_storage oldaddr;
1677 * get the old address, add new one, and then remove old one.
1680 if (hwaddr_len != ETH_ADDR_LEN) {
1681 /* just to be safe about sockaddr storage size */
1684 memset(&req, 0, sizeof(req));
1685 ovs_strlcpy(req.iflr_name, netdev_name, sizeof(req.iflr_name));
1686 req.addr.ss_len = sizeof(req.addr);
1687 req.addr.ss_family = hwaddr_family;
1688 sdl = (struct sockaddr_dl *)&req.addr;
1689 sdl->sdl_alen = hwaddr_len;
1691 error = af_link_ioctl(SIOCGLIFADDR, &req);
1695 if (!memcmp(&sdl->sdl_data[sdl->sdl_nlen], &mac, hwaddr_len)) {
1700 memset(&req, 0, sizeof(req));
1701 ovs_strlcpy(req.iflr_name, netdev_name, sizeof(req.iflr_name));
1702 req.flags = IFLR_ACTIVE;
1703 sdl = (struct sockaddr_dl *)&req.addr;
1704 sdl->sdl_len = offsetof(struct sockaddr_dl, sdl_data) + hwaddr_len;
1705 sdl->sdl_alen = hwaddr_len;
1706 sdl->sdl_family = hwaddr_family;
1707 memcpy(sdl->sdl_data, &mac, hwaddr_len);
1708 error = af_link_ioctl(SIOCALIFADDR, &req);
1713 memset(&req, 0, sizeof(req));
1714 ovs_strlcpy(req.iflr_name, netdev_name, sizeof(req.iflr_name));
1716 return af_link_ioctl(SIOCDLIFADDR, &req);
1718 #error not implemented
1723 ifr_get_flags(const struct ifreq *ifr)
1725 #ifdef HAVE_STRUCT_IFREQ_IFR_FLAGSHIGH
1726 return (ifr->ifr_flagshigh << 16) | (ifr->ifr_flags & 0xffff);
1728 return ifr->ifr_flags;
1733 ifr_set_flags(struct ifreq *ifr, int flags)
1735 #ifdef HAVE_STRUCT_IFREQ_IFR_FLAGSHIGH
1736 ifr->ifr_flags = flags & 0xffff;
1737 ifr->ifr_flagshigh = flags >> 16;
1739 ifr->ifr_flags = flags;
1743 #if defined(__NetBSD__)
1744 /* Calls ioctl() on an AF_LINK sock, passing the specified 'command' and
1745 * 'arg'. Returns 0 if successful, otherwise a positive errno value. */
1747 af_link_ioctl(unsigned long command, const void *arg)
1749 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
1752 if (ovsthread_once_start(&once)) {
1753 sock = socket(AF_LINK, SOCK_DGRAM, 0);
1756 VLOG_ERR("failed to create link socket: %s", ovs_strerror(errno));
1758 ovsthread_once_done(&once);
1761 return (sock < 0 ? -sock
1762 : ioctl(sock, command, arg) == -1 ? errno
1766 #endif /* !defined(__MACH__) */