1 /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
4 * We are making the OpenFlow specification and associated documentation
5 * (Software) available for public use and benefit with the expectation
6 * that others will use, modify and enhance the Software and contribute
7 * those enhancements back to the community. However, since we would
8 * like to make the Software available for broadest use, with as few
9 * restrictions as possible permission is hereby granted, free of
10 * charge, to any person obtaining a copy of this Software to deal in
11 * the Software under the copyrights without restriction, including
12 * without limitation the rights to use, copy, modify, merge, publish,
13 * distribute, sublicense, and/or sell copies of the Software, and to
14 * permit persons to whom the Software is furnished to do so, subject to
15 * the following conditions:
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
24 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
26 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 * The name and trademarks of copyright holder(s) may NOT be used in
30 * advertising or publicity pertaining to the Software or any
31 * derivatives without specific, written prior permission.
39 #include <arpa/inet.h>
41 #include <linux/types.h>
42 #include <linux/ethtool.h>
43 #include <linux/sockios.h>
44 #include <sys/types.h>
45 #include <sys/ioctl.h>
46 #include <sys/socket.h>
47 #include <netpacket/packet.h>
48 #include <net/ethernet.h>
50 #include <net/if_arp.h>
51 #include <net/if_packet.h>
52 #include <net/route.h>
53 #include <netinet/in.h>
59 #include "fatal-signal.h"
63 #include "poll-loop.h"
64 #include "socket-util.h"
66 #define THIS_MODULE VLM_netdev
74 uint8_t etheraddr[ETH_ADDR_LEN];
79 int save_flags; /* Initial device flags. */
80 int changed_flags; /* Flags that we changed. */
83 /* All open network devices. */
84 static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
86 /* An AF_INET socket (used for ioctl operations). */
87 static int af_inet_sock = -1;
89 /* This is set pretty low because we probably won't learn anything from the
90 * additional log messages. */
91 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
93 static void init_netdev(void);
94 static int restore_flags(struct netdev *netdev);
95 static int get_flags(const struct netdev *, int *flagsp);
96 static int set_flags(struct netdev *, int flags);
98 /* Obtains the IPv6 address for 'name' into 'in6'. */
100 get_ipv6_address(const char *name, struct in6_addr *in6)
105 file = fopen("/proc/net/if_inet6", "r");
107 /* This most likely indicates that the host doesn't have IPv6 support,
108 * so it's not really a failure condition.*/
113 while (fgets(line, sizeof line, file)) {
114 uint8_t *s6 = in6->s6_addr;
118 if (sscanf(line, " "X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8
119 "%*x %*x %*x %*x %16s\n",
120 &s6[0], &s6[1], &s6[2], &s6[3],
121 &s6[4], &s6[5], &s6[6], &s6[7],
122 &s6[8], &s6[9], &s6[10], &s6[11],
123 &s6[12], &s6[13], &s6[14], &s6[15],
125 && !strcmp(name, ifname))
136 do_ethtool(struct netdev *netdev)
139 struct ethtool_cmd ecmd;
142 netdev->features = 0;
144 memset(&ifr, 0, sizeof ifr);
145 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
146 ifr.ifr_data = (caddr_t) &ecmd;
148 memset(&ecmd, 0, sizeof ecmd);
149 ecmd.cmd = ETHTOOL_GSET;
150 if (ioctl(netdev->fd, SIOCETHTOOL, &ifr) == 0) {
151 if (ecmd.supported & SUPPORTED_10baseT_Half) {
152 netdev->features |= OFPPF_10MB_HD;
154 if (ecmd.supported & SUPPORTED_10baseT_Full) {
155 netdev->features |= OFPPF_10MB_FD;
157 if (ecmd.supported & SUPPORTED_100baseT_Half) {
158 netdev->features |= OFPPF_100MB_HD;
160 if (ecmd.supported & SUPPORTED_100baseT_Full) {
161 netdev->features |= OFPPF_100MB_FD;
163 if (ecmd.supported & SUPPORTED_1000baseT_Half) {
164 netdev->features |= OFPPF_1GB_HD;
166 if (ecmd.supported & SUPPORTED_1000baseT_Full) {
167 netdev->features |= OFPPF_1GB_FD;
169 /* 10Gbps half-duplex doesn't exist... */
170 if (ecmd.supported & SUPPORTED_10000baseT_Full) {
171 netdev->features |= OFPPF_10GB_FD;
174 switch (ecmd.speed) {
184 netdev->speed = 1000;
188 netdev->speed = 2500;
192 netdev->speed = 10000;
196 VLOG_DBG("ioctl(SIOCETHTOOL) failed: %s", strerror(errno));
200 /* Opens the network device named 'name' (e.g. "eth0") and returns zero if
201 * successful, otherwise a positive errno value. On success, sets '*netdev'
202 * to the new network device, otherwise to null.
204 * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
205 * capture frames of that type received on the device. It may also be one of
206 * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
209 netdev_open(const char *name, int ethertype, struct netdev **netdev_)
212 struct sockaddr_ll sll;
214 unsigned int ifindex;
215 uint8_t etheraddr[ETH_ADDR_LEN];
219 struct netdev *netdev;
224 /* Create raw socket. */
225 fd = socket(PF_PACKET, SOCK_RAW,
226 htons(ethertype == NETDEV_ETH_TYPE_NONE ? 0
227 : ethertype == NETDEV_ETH_TYPE_ANY ? ETH_P_ALL
228 : ethertype == NETDEV_ETH_TYPE_802_2 ? ETH_P_802_2
234 /* Get ethernet device index. */
235 strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
236 if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
237 VLOG_ERR("ioctl(SIOCGIFINDEX) on %s device failed: %s",
238 name, strerror(errno));
241 ifindex = ifr.ifr_ifindex;
243 /* Bind to specific ethernet device. */
244 memset(&sll, 0, sizeof sll);
245 sll.sll_family = AF_PACKET;
246 sll.sll_ifindex = ifindex;
247 if (bind(fd, (struct sockaddr *) &sll, sizeof sll) < 0) {
248 VLOG_ERR("bind to %s failed: %s", name, strerror(errno));
252 if (ethertype != NETDEV_ETH_TYPE_NONE) {
253 /* Between the socket() and bind() calls above, the socket receives all
254 * packets of the requested type on all system interfaces. We do not
255 * want to receive that data, but there is no way to avoid it. So we
256 * must now drain out the receive queue. */
257 error = drain_rcvbuf(fd);
263 /* Get MAC address. */
264 if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
265 VLOG_ERR("ioctl(SIOCGIFHWADDR) on %s device failed: %s",
266 name, strerror(errno));
269 if (ifr.ifr_hwaddr.sa_family != AF_UNSPEC
270 && ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
271 VLOG_WARN("%s device has unknown hardware address family %d",
272 name, (int) ifr.ifr_hwaddr.sa_family);
274 memcpy(etheraddr, ifr.ifr_hwaddr.sa_data, sizeof etheraddr);
277 if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
278 VLOG_ERR("ioctl(SIOCGIFMTU) on %s device failed: %s",
279 name, strerror(errno));
284 get_ipv6_address(name, &in6);
286 /* Allocate network device. */
287 netdev = xmalloc(sizeof *netdev);
288 netdev->name = xstrdup(name);
289 netdev->ifindex = ifindex;
291 memcpy(netdev->etheraddr, etheraddr, sizeof etheraddr);
295 /* Get speed, features. */
298 /* Save flags to restore at close or exit. */
299 error = get_flags(netdev, &netdev->save_flags);
303 netdev->changed_flags = 0;
304 fatal_signal_block();
305 list_push_back(&netdev_list, &netdev->node);
306 fatal_signal_unblock();
319 /* Closes and destroys 'netdev'. */
321 netdev_close(struct netdev *netdev)
324 /* Bring down interface and drop promiscuous mode, if we brought up
325 * the interface or enabled promiscuous mode. */
327 fatal_signal_block();
328 error = restore_flags(netdev);
329 list_remove(&netdev->node);
330 fatal_signal_unblock();
332 VLOG_WARN("failed to restore network device flags on %s: %s",
333 netdev->name, strerror(error));
343 /* Pads 'buffer' out with zero-bytes to the minimum valid length of an
344 * Ethernet packet, if necessary. */
346 pad_to_minimum_length(struct buffer *buffer)
348 if (buffer->size < ETH_TOTAL_MIN) {
349 size_t shortage = ETH_TOTAL_MIN - buffer->size;
350 memset(buffer_put_uninit(buffer, shortage), 0, shortage);
354 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
355 * must have initialized with sufficient room for the packet. The space
356 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
357 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
358 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
359 * need not be included.)
361 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
362 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
363 * positive errno value. Returns EAGAIN immediately if no packet is ready to
367 netdev_recv(struct netdev *netdev, struct buffer *buffer)
371 assert(buffer->size == 0);
372 assert(buffer_tailroom(buffer) >= ETH_TOTAL_MIN);
374 n_bytes = recv(netdev->fd,
375 buffer_tail(buffer), buffer_tailroom(buffer),
377 } while (n_bytes < 0 && errno == EINTR);
379 if (errno != EAGAIN) {
380 VLOG_WARN_RL(&rl, "error receiving Ethernet packet on %s: %s",
381 strerror(errno), netdev->name);
385 buffer->size += n_bytes;
387 /* When the kernel internally sends out an Ethernet frame on an
388 * interface, it gives us a copy *before* padding the frame to the
389 * minimum length. Thus, when it sends out something like an ARP
390 * request, we see a too-short frame. So pad it out to the minimum
392 pad_to_minimum_length(buffer);
397 /* Registers with the poll loop to wake up from the next call to poll_block()
398 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
400 netdev_recv_wait(struct netdev *netdev)
402 poll_fd_wait(netdev->fd, POLLIN);
405 /* Discards all packets waiting to be received from 'netdev'. */
407 netdev_drain(struct netdev *netdev)
409 drain_rcvbuf(netdev->fd);
412 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
413 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
414 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
415 * the packet is too big or too small to transmit on the device.
417 * The caller retains ownership of 'buffer' in all cases.
419 * The kernel maintains a packet transmission queue, so the caller is not
420 * expected to do additional queuing of packets. */
422 netdev_send(struct netdev *netdev, const struct buffer *buffer)
425 const struct eth_header *eh;
427 /* Pull out the Ethernet header. */
428 if (buffer->size < ETH_HEADER_LEN) {
429 VLOG_WARN_RL(&rl, "cannot send %zu-byte frame on %s",
430 buffer->size, netdev->name);
433 eh = buffer_at_assert(buffer, 0, sizeof *eh);
436 n_bytes = sendto(netdev->fd, buffer->data, buffer->size, 0, NULL, 0);
437 } while (n_bytes < 0 && errno == EINTR);
440 /* The Linux AF_PACKET implementation never blocks waiting for room
441 * for packets, instead returning ENOBUFS. Translate this into EAGAIN
443 if (errno == ENOBUFS) {
445 } else if (errno != EAGAIN) {
446 VLOG_WARN_RL(&rl, "error sending Ethernet packet on %s: %s",
447 netdev->name, strerror(errno));
450 } else if (n_bytes != buffer->size) {
452 "send partial Ethernet packet (%d bytes of %zu) on %s",
453 (int) n_bytes, buffer->size, netdev->name);
460 /* Registers with the poll loop to wake up from the next call to poll_block()
461 * when the packet transmission queue has sufficient room to transmit a packet
462 * with netdev_send().
464 * The kernel maintains a packet transmission queue, so the client is not
465 * expected to do additional queuing of packets. Thus, this function is
466 * unlikely to ever be used. It is included for completeness. */
468 netdev_send_wait(struct netdev *netdev)
470 poll_fd_wait(netdev->fd, POLLOUT);
473 /* Returns a pointer to 'netdev''s MAC address. The caller must not modify or
474 * free the returned buffer. */
476 netdev_get_etheraddr(const struct netdev *netdev)
478 return netdev->etheraddr;
481 /* Returns the name of the network device that 'netdev' represents,
482 * e.g. "eth0". The caller must not modify or free the returned string. */
484 netdev_get_name(const struct netdev *netdev)
489 /* Returns the maximum size of transmitted (and received) packets on 'netdev',
490 * in bytes, not including the hardware header; thus, this is typically 1500
491 * bytes for Ethernet devices. */
493 netdev_get_mtu(const struct netdev *netdev)
498 /* Returns the current speed of the network device that 'netdev' represents, in
499 * megabits per second, or 0 if the speed is unknown. */
501 netdev_get_speed(const struct netdev *netdev)
503 return netdev->speed;
506 /* Checks the link status. Returns 1 or 0 to indicate the link is active
507 * or not, respectively. Any other return value indicates an error. */
509 netdev_get_link_status(const struct netdev *netdev)
512 struct ethtool_value edata;
514 memset(&ifr, 0, sizeof ifr);
515 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
516 ifr.ifr_data = (caddr_t) &edata;
518 memset(&edata, 0, sizeof edata);
519 edata.cmd = ETHTOOL_GLINK;
520 if (ioctl(netdev->fd, SIOCETHTOOL, &ifr) == 0) {
531 /* Returns the features supported by 'netdev', as a bitmap of bits from enum
532 * ofp_phy_port, in host byte order. */
534 netdev_get_features(const struct netdev *netdev)
536 return netdev->features;
539 /* If 'netdev' has an assigned IPv4 address, sets '*in4' to that address (if
540 * 'in4' is non-null) and returns true. Otherwise, returns false. */
542 netdev_get_in4(const struct netdev *netdev, struct in_addr *in4)
545 struct in_addr ip = { INADDR_ANY };
547 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
548 ifr.ifr_addr.sa_family = AF_INET;
549 if (ioctl(af_inet_sock, SIOCGIFADDR, &ifr) == 0) {
550 struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
553 VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFADDR) failed: %s",
554 netdev->name, strerror(errno));
559 return ip.s_addr != INADDR_ANY;
563 make_in4_sockaddr(struct sockaddr *sa, struct in_addr addr)
565 struct sockaddr_in sin;
566 memset(&sin, 0, sizeof sin);
567 sin.sin_family = AF_INET;
571 memset(sa, 0, sizeof *sa);
572 memcpy(sa, &sin, sizeof sin);
576 do_set_addr(struct netdev *netdev, int sock,
577 int ioctl_nr, const char *ioctl_name, struct in_addr addr)
582 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
583 make_in4_sockaddr(&ifr.ifr_addr, addr);
584 error = ioctl(sock, ioctl_nr, &ifr) < 0 ? errno : 0;
586 VLOG_WARN("ioctl(%s): %s", ioctl_name, strerror(error));
591 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
592 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
593 * positive errno value. */
595 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
599 error = do_set_addr(netdev, af_inet_sock,
600 SIOCSIFADDR, "SIOCSIFADDR", addr);
601 if (!error && addr.s_addr != INADDR_ANY) {
602 error = do_set_addr(netdev, af_inet_sock,
603 SIOCSIFNETMASK, "SIOCSIFNETMASK", mask);
608 /* Adds 'router' as a default gateway for 'netdev''s IP address. */
610 netdev_add_router(struct netdev *netdev, struct in_addr router)
612 struct in_addr any = { INADDR_ANY };
616 memset(&rt, 0, sizeof rt);
617 make_in4_sockaddr(&rt.rt_dst, any);
618 make_in4_sockaddr(&rt.rt_gateway, router);
619 make_in4_sockaddr(&rt.rt_genmask, any);
620 rt.rt_flags = RTF_UP | RTF_GATEWAY;
621 error = ioctl(af_inet_sock, SIOCADDRT, &rt) < 0 ? errno : 0;
623 VLOG_WARN("ioctl(SIOCADDRT): %s", strerror(error));
628 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address (if
629 * 'in6' is non-null) and returns true. Otherwise, returns false. */
631 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
636 return memcmp(&netdev->in6, &in6addr_any, sizeof netdev->in6) != 0;
639 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
640 * Returns 0 if successful, otherwise a positive errno value. */
642 netdev_get_flags(const struct netdev *netdev, enum netdev_flags *flagsp)
646 error = get_flags(netdev, &flags);
652 if (flags & IFF_UP) {
653 *flagsp |= NETDEV_UP;
655 if (flags & IFF_PROMISC) {
656 *flagsp |= NETDEV_PROMISC;
662 nd_to_iff_flags(enum netdev_flags nd)
665 if (nd & NETDEV_UP) {
668 if (nd & NETDEV_PROMISC) {
674 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
675 * 'on'. If 'permanent' is true, the changes will persist; otherwise, they
676 * will be reverted when 'netdev' is closed or the program exits. Returns 0 if
677 * successful, otherwise a positive errno value. */
679 do_update_flags(struct netdev *netdev, enum netdev_flags off,
680 enum netdev_flags on, bool permanent)
682 int old_flags, new_flags;
685 error = get_flags(netdev, &old_flags);
690 new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
692 netdev->changed_flags |= new_flags ^ old_flags;
694 if (new_flags != old_flags) {
695 error = set_flags(netdev, new_flags);
700 /* Sets the flags for 'netdev' to 'flags'.
701 * If 'permanent' is true, the changes will persist; otherwise, they
702 * will be reverted when 'netdev' is closed or the program exits.
703 * Returns 0 if successful, otherwise a positive errno value. */
705 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
708 return do_update_flags(netdev, -1, flags, permanent);
711 /* Turns on the specified 'flags' on 'netdev'.
712 * If 'permanent' is true, the changes will persist; otherwise, they
713 * will be reverted when 'netdev' is closed or the program exits.
714 * Returns 0 if successful, otherwise a positive errno value. */
716 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
719 return do_update_flags(netdev, 0, flags, permanent);
722 /* Turns off the specified 'flags' on 'netdev'.
723 * If 'permanent' is true, the changes will persist; otherwise, they
724 * will be reverted when 'netdev' is closed or the program exits.
725 * Returns 0 if successful, otherwise a positive errno value. */
727 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
730 return do_update_flags(netdev, flags, 0, permanent);
733 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
734 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
735 * returns 0. Otherwise, it returns a positive errno value; in particular,
736 * ENXIO indicates that there is not ARP table entry for 'ip' on 'netdev'. */
738 netdev_arp_lookup(const struct netdev *netdev,
739 uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
742 struct sockaddr_in *pa;
745 memset(&r, 0, sizeof r);
746 pa = (struct sockaddr_in *) &r.arp_pa;
747 pa->sin_family = AF_INET;
748 pa->sin_addr.s_addr = ip;
750 r.arp_ha.sa_family = ARPHRD_ETHER;
752 strncpy(r.arp_dev, netdev->name, sizeof r.arp_dev);
753 retval = ioctl(af_inet_sock, SIOCGARP, &r) < 0 ? errno : 0;
755 memcpy(mac, r.arp_ha.sa_data, ETH_ADDR_LEN);
756 } else if (retval != ENXIO) {
757 VLOG_WARN_RL(&rl, "%s: could not look up ARP entry for "IP_FMT": %s",
758 netdev->name, IP_ARGS(&ip), strerror(retval));
763 static void restore_all_flags(void *aux);
765 /* Set up a signal hook to restore network device flags on program
773 fatal_signal_add_hook(restore_all_flags, NULL, true);
774 af_inet_sock = socket(AF_INET, SOCK_DGRAM, 0);
775 if (af_inet_sock < 0) {
776 fatal(errno, "socket(AF_INET)");
781 /* Restore the network device flags on 'netdev' to those that were active
782 * before we changed them. Returns 0 if successful, otherwise a positive
785 * To avoid reentry, the caller must ensure that fatal signals are blocked. */
787 restore_flags(struct netdev *netdev)
792 /* Get current flags. */
793 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
794 if (ioctl(netdev->fd, SIOCGIFFLAGS, &ifr) < 0) {
798 /* Restore flags that we might have changed, if necessary. */
799 restore_flags = netdev->changed_flags & (IFF_PROMISC | IFF_UP);
800 if ((ifr.ifr_flags ^ netdev->save_flags) & restore_flags) {
801 ifr.ifr_flags &= ~restore_flags;
802 ifr.ifr_flags |= netdev->save_flags & restore_flags;
803 if (ioctl(netdev->fd, SIOCSIFFLAGS, &ifr) < 0) {
811 /* Retores all the flags on all network devices that we modified. Called from
812 * a signal handler, so it does not attempt to report error conditions. */
814 restore_all_flags(void *aux UNUSED)
816 struct netdev *netdev;
817 LIST_FOR_EACH (netdev, struct netdev, node, &netdev_list) {
818 restore_flags(netdev);
823 get_flags(const struct netdev *netdev, int *flags)
826 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
827 if (ioctl(netdev->fd, SIOCGIFFLAGS, &ifr) < 0) {
828 VLOG_ERR("ioctl(SIOCGIFFLAGS) on %s device failed: %s",
829 netdev->name, strerror(errno));
832 *flags = ifr.ifr_flags;
837 set_flags(struct netdev *netdev, int flags)
840 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
841 ifr.ifr_flags = flags;
842 if (ioctl(netdev->fd, SIOCSIFFLAGS, &ifr) < 0) {
843 VLOG_ERR("ioctl(SIOCSIFFLAGS) on %s device failed: %s",
844 netdev->name, strerror(errno));