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 <linux/version.h>
45 #include <sys/types.h>
46 #include <sys/ioctl.h>
47 #include <sys/socket.h>
48 #include <netpacket/packet.h>
49 #include <net/ethernet.h>
51 #include <net/if_arp.h>
52 #include <net/if_packet.h>
53 #include <net/route.h>
54 #include <netinet/in.h>
59 #include "fatal-signal.h"
64 #include "poll-loop.h"
65 #include "socket-util.h"
67 #define THIS_MODULE VLM_netdev
75 uint8_t etheraddr[ETH_ADDR_LEN];
79 /* Bitmaps of OFPPF_* that describe features. All bits disabled if
80 * unsupported or unavailable. */
81 uint32_t curr; /* Current features. */
82 uint32_t advertised; /* Features being advertised by the port. */
83 uint32_t supported; /* Features supported by the port. */
84 uint32_t peer; /* Features advertised by the peer. */
87 int save_flags; /* Initial device flags. */
88 int changed_flags; /* Flags that we changed. */
91 /* All open network devices. */
92 static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
94 /* An AF_INET socket (used for ioctl operations). */
95 static int af_inet_sock = -1;
97 /* This is set pretty low because we probably won't learn anything from the
98 * additional log messages. */
99 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
101 static void init_netdev(void);
102 static int restore_flags(struct netdev *netdev);
103 static int get_flags(const struct netdev *, int *flagsp);
104 static int set_flags(struct netdev *, int flags);
106 /* Obtains the IPv6 address for 'name' into 'in6'. */
108 get_ipv6_address(const char *name, struct in6_addr *in6)
113 file = fopen("/proc/net/if_inet6", "r");
115 /* This most likely indicates that the host doesn't have IPv6 support,
116 * so it's not really a failure condition.*/
121 while (fgets(line, sizeof line, file)) {
122 uint8_t *s6 = in6->s6_addr;
126 if (sscanf(line, " "X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8
127 "%*x %*x %*x %*x %16s\n",
128 &s6[0], &s6[1], &s6[2], &s6[3],
129 &s6[4], &s6[5], &s6[6], &s6[7],
130 &s6[8], &s6[9], &s6[10], &s6[11],
131 &s6[12], &s6[13], &s6[14], &s6[15],
133 && !strcmp(name, ifname))
144 do_ethtool(struct netdev *netdev)
147 struct ethtool_cmd ecmd;
150 netdev->supported = 0;
151 netdev->advertised = 0;
154 memset(&ifr, 0, sizeof ifr);
155 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
156 ifr.ifr_data = (caddr_t) &ecmd;
158 memset(&ecmd, 0, sizeof ecmd);
159 ecmd.cmd = ETHTOOL_GSET;
160 if (ioctl(netdev->fd, SIOCETHTOOL, &ifr) == 0) {
161 if (ecmd.supported & SUPPORTED_10baseT_Half) {
162 netdev->supported |= OFPPF_10MB_HD;
164 if (ecmd.supported & SUPPORTED_10baseT_Full) {
165 netdev->supported |= OFPPF_10MB_FD;
167 if (ecmd.supported & SUPPORTED_100baseT_Half) {
168 netdev->supported |= OFPPF_100MB_HD;
170 if (ecmd.supported & SUPPORTED_100baseT_Full) {
171 netdev->supported |= OFPPF_100MB_FD;
173 if (ecmd.supported & SUPPORTED_1000baseT_Half) {
174 netdev->supported |= OFPPF_1GB_HD;
176 if (ecmd.supported & SUPPORTED_1000baseT_Full) {
177 netdev->supported |= OFPPF_1GB_FD;
179 if (ecmd.supported & SUPPORTED_10000baseT_Full) {
180 netdev->supported |= OFPPF_10GB_FD;
182 if (ecmd.supported & SUPPORTED_TP) {
183 netdev->supported |= OFPPF_COPPER;
185 if (ecmd.supported & SUPPORTED_FIBRE) {
186 netdev->supported |= OFPPF_FIBER;
188 if (ecmd.supported & SUPPORTED_Autoneg) {
189 netdev->supported |= OFPPF_AUTONEG;
191 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,14)
192 if (ecmd.supported & SUPPORTED_Pause) {
193 netdev->supported |= OFPPF_PAUSE;
195 if (ecmd.supported & SUPPORTED_Asym_Pause) {
196 netdev->supported |= OFPPF_PAUSE_ASYM;
198 #endif /* kernel >= 2.6.14 */
200 /* Set the advertised features */
201 if (ecmd.advertising & ADVERTISED_10baseT_Half) {
202 netdev->advertised |= OFPPF_10MB_HD;
204 if (ecmd.advertising & ADVERTISED_10baseT_Full) {
205 netdev->advertised |= OFPPF_10MB_FD;
207 if (ecmd.advertising & ADVERTISED_100baseT_Half) {
208 netdev->advertised |= OFPPF_100MB_HD;
210 if (ecmd.advertising & ADVERTISED_100baseT_Full) {
211 netdev->advertised |= OFPPF_100MB_FD;
213 if (ecmd.advertising & ADVERTISED_1000baseT_Half) {
214 netdev->advertised |= OFPPF_1GB_HD;
216 if (ecmd.advertising & ADVERTISED_1000baseT_Full) {
217 netdev->advertised |= OFPPF_1GB_FD;
219 if (ecmd.advertising & ADVERTISED_10000baseT_Full) {
220 netdev->advertised |= OFPPF_10GB_FD;
222 if (ecmd.advertising & ADVERTISED_TP) {
223 netdev->advertised |= OFPPF_COPPER;
225 if (ecmd.advertising & ADVERTISED_FIBRE) {
226 netdev->advertised |= OFPPF_FIBER;
228 if (ecmd.advertising & ADVERTISED_Autoneg) {
229 netdev->advertised |= OFPPF_AUTONEG;
231 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,14)
232 if (ecmd.advertising & ADVERTISED_Pause) {
233 netdev->advertised |= OFPPF_PAUSE;
235 if (ecmd.advertising & ADVERTISED_Asym_Pause) {
236 netdev->advertised |= OFPPF_PAUSE_ASYM;
238 #endif /* kernel >= 2.6.14 */
240 /* Set the current features */
241 if (ecmd.speed == SPEED_10) {
242 netdev->curr = (ecmd.duplex) ? OFPPF_10MB_FD : OFPPF_10MB_HD;
244 else if (ecmd.speed == SPEED_100) {
245 netdev->curr = (ecmd.duplex) ? OFPPF_100MB_FD : OFPPF_100MB_HD;
247 else if (ecmd.speed == SPEED_1000) {
248 netdev->curr = (ecmd.duplex) ? OFPPF_1GB_FD : OFPPF_1GB_HD;
250 else if (ecmd.speed == SPEED_10000) {
251 netdev->curr = OFPPF_10GB_FD;
254 if (ecmd.port == PORT_TP) {
255 netdev->curr |= OFPPF_COPPER;
257 else if (ecmd.port == PORT_FIBRE) {
258 netdev->curr |= OFPPF_FIBER;
262 netdev->curr |= OFPPF_AUTONEG;
265 VLOG_DBG("ioctl(SIOCETHTOOL) failed: %s", strerror(errno));
269 /* Opens the network device named 'name' (e.g. "eth0") and returns zero if
270 * successful, otherwise a positive errno value. On success, sets '*netdev'
271 * to the new network device, otherwise to null.
273 * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
274 * capture frames of that type received on the device. It may also be one of
275 * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
278 netdev_open(const char *name, int ethertype, struct netdev **netdev_)
281 struct sockaddr_ll sll;
283 unsigned int ifindex;
284 uint8_t etheraddr[ETH_ADDR_LEN];
288 struct netdev *netdev;
293 /* Create raw socket. */
294 fd = socket(PF_PACKET, SOCK_RAW,
295 htons(ethertype == NETDEV_ETH_TYPE_NONE ? 0
296 : ethertype == NETDEV_ETH_TYPE_ANY ? ETH_P_ALL
297 : ethertype == NETDEV_ETH_TYPE_802_2 ? ETH_P_802_2
303 /* Get ethernet device index. */
304 strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
305 if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
306 VLOG_ERR("ioctl(SIOCGIFINDEX) on %s device failed: %s",
307 name, strerror(errno));
310 ifindex = ifr.ifr_ifindex;
312 /* Bind to specific ethernet device. */
313 memset(&sll, 0, sizeof sll);
314 sll.sll_family = AF_PACKET;
315 sll.sll_ifindex = ifindex;
316 if (bind(fd, (struct sockaddr *) &sll, sizeof sll) < 0) {
317 VLOG_ERR("bind to %s failed: %s", name, strerror(errno));
321 if (ethertype != NETDEV_ETH_TYPE_NONE) {
322 /* Between the socket() and bind() calls above, the socket receives all
323 * packets of the requested type on all system interfaces. We do not
324 * want to receive that data, but there is no way to avoid it. So we
325 * must now drain out the receive queue. */
326 error = drain_rcvbuf(fd);
332 /* Get MAC address. */
333 if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
334 VLOG_ERR("ioctl(SIOCGIFHWADDR) on %s device failed: %s",
335 name, strerror(errno));
338 if (ifr.ifr_hwaddr.sa_family != AF_UNSPEC
339 && ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
340 VLOG_WARN("%s device has unknown hardware address family %d",
341 name, (int) ifr.ifr_hwaddr.sa_family);
343 memcpy(etheraddr, ifr.ifr_hwaddr.sa_data, sizeof etheraddr);
346 if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
347 VLOG_ERR("ioctl(SIOCGIFMTU) on %s device failed: %s",
348 name, strerror(errno));
353 get_ipv6_address(name, &in6);
355 /* Allocate network device. */
356 netdev = xmalloc(sizeof *netdev);
357 netdev->name = xstrdup(name);
358 netdev->ifindex = ifindex;
360 memcpy(netdev->etheraddr, etheraddr, sizeof etheraddr);
364 /* Get speed, features. */
367 /* Save flags to restore at close or exit. */
368 error = get_flags(netdev, &netdev->save_flags);
372 netdev->changed_flags = 0;
373 fatal_signal_block();
374 list_push_back(&netdev_list, &netdev->node);
375 fatal_signal_unblock();
388 /* Closes and destroys 'netdev'. */
390 netdev_close(struct netdev *netdev)
393 /* Bring down interface and drop promiscuous mode, if we brought up
394 * the interface or enabled promiscuous mode. */
396 fatal_signal_block();
397 error = restore_flags(netdev);
398 list_remove(&netdev->node);
399 fatal_signal_unblock();
401 VLOG_WARN("failed to restore network device flags on %s: %s",
402 netdev->name, strerror(error));
412 /* Pads 'buffer' out with zero-bytes to the minimum valid length of an
413 * Ethernet packet, if necessary. */
415 pad_to_minimum_length(struct ofpbuf *buffer)
417 if (buffer->size < ETH_TOTAL_MIN) {
418 size_t shortage = ETH_TOTAL_MIN - buffer->size;
419 memset(ofpbuf_put_uninit(buffer, shortage), 0, shortage);
423 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
424 * must have initialized with sufficient room for the packet. The space
425 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
426 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
427 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
428 * need not be included.)
430 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
431 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
432 * positive errno value. Returns EAGAIN immediately if no packet is ready to
436 netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
440 assert(buffer->size == 0);
441 assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
443 n_bytes = recv(netdev->fd,
444 ofpbuf_tail(buffer), ofpbuf_tailroom(buffer),
446 } while (n_bytes < 0 && errno == EINTR);
448 if (errno != EAGAIN) {
449 VLOG_WARN_RL(&rl, "error receiving Ethernet packet on %s: %s",
450 strerror(errno), netdev->name);
454 buffer->size += n_bytes;
456 /* When the kernel internally sends out an Ethernet frame on an
457 * interface, it gives us a copy *before* padding the frame to the
458 * minimum length. Thus, when it sends out something like an ARP
459 * request, we see a too-short frame. So pad it out to the minimum
461 pad_to_minimum_length(buffer);
466 /* Registers with the poll loop to wake up from the next call to poll_block()
467 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
469 netdev_recv_wait(struct netdev *netdev)
471 poll_fd_wait(netdev->fd, POLLIN);
474 /* Discards all packets waiting to be received from 'netdev'. */
476 netdev_drain(struct netdev *netdev)
478 drain_rcvbuf(netdev->fd);
481 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
482 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
483 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
484 * the packet is too big or too small to transmit on the device.
486 * The caller retains ownership of 'buffer' in all cases.
488 * The kernel maintains a packet transmission queue, so the caller is not
489 * expected to do additional queuing of packets. */
491 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
496 n_bytes = sendto(netdev->fd, buffer->data, buffer->size, 0, NULL, 0);
497 } while (n_bytes < 0 && errno == EINTR);
500 /* The Linux AF_PACKET implementation never blocks waiting for room
501 * for packets, instead returning ENOBUFS. Translate this into EAGAIN
503 if (errno == ENOBUFS) {
505 } else if (errno != EAGAIN) {
506 VLOG_WARN_RL(&rl, "error sending Ethernet packet on %s: %s",
507 netdev->name, strerror(errno));
510 } else if (n_bytes != buffer->size) {
512 "send partial Ethernet packet (%d bytes of %zu) on %s",
513 (int) n_bytes, buffer->size, netdev->name);
520 /* Registers with the poll loop to wake up from the next call to poll_block()
521 * when the packet transmission queue has sufficient room to transmit a packet
522 * with netdev_send().
524 * The kernel maintains a packet transmission queue, so the client is not
525 * expected to do additional queuing of packets. Thus, this function is
526 * unlikely to ever be used. It is included for completeness. */
528 netdev_send_wait(struct netdev *netdev)
530 poll_fd_wait(netdev->fd, POLLOUT);
533 /* Returns a pointer to 'netdev''s MAC address. The caller must not modify or
534 * free the returned buffer. */
536 netdev_get_etheraddr(const struct netdev *netdev)
538 return netdev->etheraddr;
541 /* Returns the name of the network device that 'netdev' represents,
542 * e.g. "eth0". The caller must not modify or free the returned string. */
544 netdev_get_name(const struct netdev *netdev)
549 /* Returns the maximum size of transmitted (and received) packets on 'netdev',
550 * in bytes, not including the hardware header; thus, this is typically 1500
551 * bytes for Ethernet devices. */
553 netdev_get_mtu(const struct netdev *netdev)
558 /* Checks the link status. Returns 1 or 0 to indicate the link is active
559 * or not, respectively. Any other return value indicates an error. */
561 netdev_get_link_status(const struct netdev *netdev)
564 struct ethtool_value edata;
566 memset(&ifr, 0, sizeof ifr);
567 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
568 ifr.ifr_data = (caddr_t) &edata;
570 memset(&edata, 0, sizeof edata);
571 edata.cmd = ETHTOOL_GLINK;
572 if (ioctl(netdev->fd, SIOCETHTOOL, &ifr) == 0) {
583 /* Returns the features supported by 'netdev' of type 'type', as a bitmap
584 * of bits from enum ofp_phy_features, in host byte order. */
586 netdev_get_features(struct netdev *netdev, int type)
590 case NETDEV_FEAT_CURRENT:
592 case NETDEV_FEAT_ADVERTISED:
593 return netdev->advertised;
594 case NETDEV_FEAT_SUPPORTED:
595 return netdev->supported;
596 case NETDEV_FEAT_PEER:
599 VLOG_WARN("Unknown feature type: %d\n", type);
604 /* If 'netdev' has an assigned IPv4 address, sets '*in4' to that address (if
605 * 'in4' is non-null) and returns true. Otherwise, returns false. */
607 netdev_get_in4(const struct netdev *netdev, struct in_addr *in4)
610 struct in_addr ip = { INADDR_ANY };
612 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
613 ifr.ifr_addr.sa_family = AF_INET;
614 if (ioctl(af_inet_sock, SIOCGIFADDR, &ifr) == 0) {
615 struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
618 VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFADDR) failed: %s",
619 netdev->name, strerror(errno));
624 return ip.s_addr != INADDR_ANY;
628 make_in4_sockaddr(struct sockaddr *sa, struct in_addr addr)
630 struct sockaddr_in sin;
631 memset(&sin, 0, sizeof sin);
632 sin.sin_family = AF_INET;
636 memset(sa, 0, sizeof *sa);
637 memcpy(sa, &sin, sizeof sin);
641 do_set_addr(struct netdev *netdev, int sock,
642 int ioctl_nr, const char *ioctl_name, struct in_addr addr)
647 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
648 make_in4_sockaddr(&ifr.ifr_addr, addr);
649 error = ioctl(sock, ioctl_nr, &ifr) < 0 ? errno : 0;
651 VLOG_WARN("ioctl(%s): %s", ioctl_name, strerror(error));
656 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
657 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
658 * positive errno value. */
660 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
664 error = do_set_addr(netdev, af_inet_sock,
665 SIOCSIFADDR, "SIOCSIFADDR", addr);
666 if (!error && addr.s_addr != INADDR_ANY) {
667 error = do_set_addr(netdev, af_inet_sock,
668 SIOCSIFNETMASK, "SIOCSIFNETMASK", mask);
673 /* Adds 'router' as a default gateway for 'netdev''s IP address. */
675 netdev_add_router(struct netdev *netdev, struct in_addr router)
677 struct in_addr any = { INADDR_ANY };
681 memset(&rt, 0, sizeof rt);
682 make_in4_sockaddr(&rt.rt_dst, any);
683 make_in4_sockaddr(&rt.rt_gateway, router);
684 make_in4_sockaddr(&rt.rt_genmask, any);
685 rt.rt_flags = RTF_UP | RTF_GATEWAY;
686 error = ioctl(af_inet_sock, SIOCADDRT, &rt) < 0 ? errno : 0;
688 VLOG_WARN("ioctl(SIOCADDRT): %s", strerror(error));
693 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address (if
694 * 'in6' is non-null) and returns true. Otherwise, returns false. */
696 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
701 return memcmp(&netdev->in6, &in6addr_any, sizeof netdev->in6) != 0;
704 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
705 * Returns 0 if successful, otherwise a positive errno value. */
707 netdev_get_flags(const struct netdev *netdev, enum netdev_flags *flagsp)
711 error = get_flags(netdev, &flags);
717 if (flags & IFF_UP) {
718 *flagsp |= NETDEV_UP;
720 if (flags & IFF_PROMISC) {
721 *flagsp |= NETDEV_PROMISC;
727 nd_to_iff_flags(enum netdev_flags nd)
730 if (nd & NETDEV_UP) {
733 if (nd & NETDEV_PROMISC) {
739 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
740 * 'on'. If 'permanent' is true, the changes will persist; otherwise, they
741 * will be reverted when 'netdev' is closed or the program exits. Returns 0 if
742 * successful, otherwise a positive errno value. */
744 do_update_flags(struct netdev *netdev, enum netdev_flags off,
745 enum netdev_flags on, bool permanent)
747 int old_flags, new_flags;
750 error = get_flags(netdev, &old_flags);
755 new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
757 netdev->changed_flags |= new_flags ^ old_flags;
759 if (new_flags != old_flags) {
760 error = set_flags(netdev, new_flags);
765 /* Sets the flags for 'netdev' to 'flags'.
766 * If 'permanent' is true, the changes will persist; otherwise, they
767 * will be reverted when 'netdev' is closed or the program exits.
768 * Returns 0 if successful, otherwise a positive errno value. */
770 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
773 return do_update_flags(netdev, -1, flags, permanent);
776 /* Turns on the specified 'flags' on 'netdev'.
777 * If 'permanent' is true, the changes will persist; otherwise, they
778 * will be reverted when 'netdev' is closed or the program exits.
779 * Returns 0 if successful, otherwise a positive errno value. */
781 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
784 return do_update_flags(netdev, 0, flags, permanent);
787 /* Turns off the specified 'flags' on 'netdev'.
788 * If 'permanent' is true, the changes will persist; otherwise, they
789 * will be reverted when 'netdev' is closed or the program exits.
790 * Returns 0 if successful, otherwise a positive errno value. */
792 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
795 return do_update_flags(netdev, flags, 0, permanent);
798 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
799 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
800 * returns 0. Otherwise, it returns a positive errno value; in particular,
801 * ENXIO indicates that there is not ARP table entry for 'ip' on 'netdev'. */
803 netdev_arp_lookup(const struct netdev *netdev,
804 uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
807 struct sockaddr_in *pa;
810 memset(&r, 0, sizeof r);
811 pa = (struct sockaddr_in *) &r.arp_pa;
812 pa->sin_family = AF_INET;
813 pa->sin_addr.s_addr = ip;
815 r.arp_ha.sa_family = ARPHRD_ETHER;
817 strncpy(r.arp_dev, netdev->name, sizeof r.arp_dev);
818 retval = ioctl(af_inet_sock, SIOCGARP, &r) < 0 ? errno : 0;
820 memcpy(mac, r.arp_ha.sa_data, ETH_ADDR_LEN);
821 } else if (retval != ENXIO) {
822 VLOG_WARN_RL(&rl, "%s: could not look up ARP entry for "IP_FMT": %s",
823 netdev->name, IP_ARGS(&ip), strerror(retval));
828 static void restore_all_flags(void *aux);
830 /* Set up a signal hook to restore network device flags on program
838 fatal_signal_add_hook(restore_all_flags, NULL, true);
839 af_inet_sock = socket(AF_INET, SOCK_DGRAM, 0);
840 if (af_inet_sock < 0) {
841 ofp_fatal(errno, "socket(AF_INET)");
846 /* Restore the network device flags on 'netdev' to those that were active
847 * before we changed them. Returns 0 if successful, otherwise a positive
850 * To avoid reentry, the caller must ensure that fatal signals are blocked. */
852 restore_flags(struct netdev *netdev)
857 /* Get current flags. */
858 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
859 if (ioctl(netdev->fd, SIOCGIFFLAGS, &ifr) < 0) {
863 /* Restore flags that we might have changed, if necessary. */
864 restore_flags = netdev->changed_flags & (IFF_PROMISC | IFF_UP);
865 if ((ifr.ifr_flags ^ netdev->save_flags) & restore_flags) {
866 ifr.ifr_flags &= ~restore_flags;
867 ifr.ifr_flags |= netdev->save_flags & restore_flags;
868 if (ioctl(netdev->fd, SIOCSIFFLAGS, &ifr) < 0) {
876 /* Retores all the flags on all network devices that we modified. Called from
877 * a signal handler, so it does not attempt to report error conditions. */
879 restore_all_flags(void *aux UNUSED)
881 struct netdev *netdev;
882 LIST_FOR_EACH (netdev, struct netdev, node, &netdev_list) {
883 restore_flags(netdev);
888 get_flags(const struct netdev *netdev, int *flags)
891 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
892 if (ioctl(netdev->fd, SIOCGIFFLAGS, &ifr) < 0) {
893 VLOG_ERR("ioctl(SIOCGIFFLAGS) on %s device failed: %s",
894 netdev->name, strerror(errno));
897 *flags = ifr.ifr_flags;
902 set_flags(struct netdev *netdev, int flags)
905 strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
906 ifr.ifr_flags = flags;
907 if (ioctl(netdev->fd, SIOCSIFFLAGS, &ifr) < 0) {
908 VLOG_ERR("ioctl(SIOCSIFFLAGS) on %s device failed: %s",
909 netdev->name, strerror(errno));