/*
- * Copyright (c) 2009 Nicira Networks.
+ * Copyright (c) 2009, 2010 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*/
#include <config.h>
-
-#include "netdev-linux.h"
-
+#include <assert.h>
#include <errno.h>
-#include <sys/socket.h>
+#include <fcntl.h>
+#include <arpa/inet.h>
+#include <inttypes.h>
+#include <linux/if_tun.h>
+#include <linux/ip.h>
+#include <linux/types.h>
+#include <linux/ethtool.h>
+#include <linux/pkt_sched.h>
#include <linux/rtnetlink.h>
+#include <linux/sockios.h>
+#include <linux/version.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <linux/if_tunnel.h>
+#include <net/if_arp.h>
+#include <net/if_packet.h>
+#include <net/route.h>
+#include <netinet/in.h>
#include <poll.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
#include "coverage.h"
+#include "dynamic-string.h"
+#include "fatal-signal.h"
+#include "netdev-provider.h"
#include "netlink.h"
#include "ofpbuf.h"
+#include "openflow/openflow.h"
+#include "openvswitch/internal_dev.h"
+#include "openvswitch/gre.h"
+#include "packets.h"
+#include "poll-loop.h"
+#include "rtnetlink.h"
+#include "socket-util.h"
+#include "shash.h"
+#include "svec.h"
#define THIS_MODULE VLM_netdev_linux
#include "vlog.h"
+\f
+/* These were introduced in Linux 2.6.14, so they might be missing if we have
+ * old headers. */
+#ifndef ADVERTISED_Pause
+#define ADVERTISED_Pause (1 << 13)
+#endif
+#ifndef ADVERTISED_Asym_Pause
+#define ADVERTISED_Asym_Pause (1 << 14)
+#endif
+
+static struct rtnetlink_notifier netdev_linux_cache_notifier;
+static int cache_notifier_refcount;
+
+enum {
+ VALID_IFINDEX = 1 << 0,
+ VALID_ETHERADDR = 1 << 1,
+ VALID_IN4 = 1 << 2,
+ VALID_IN6 = 1 << 3,
+ VALID_MTU = 1 << 4,
+ VALID_CARRIER = 1 << 5,
+ VALID_IS_PSEUDO = 1 << 6, /* Represents is_internal and is_tap. */
+ VALID_POLICING = 1 << 7
+};
+
+struct tap_state {
+ int fd;
+};
+
+struct netdev_dev_linux {
+ struct netdev_dev netdev_dev;
+
+ struct shash_node *shash_node;
+ unsigned int cache_valid;
+
+ /* The following are figured out "on demand" only. They are only valid
+ * when the corresponding VALID_* bit in 'cache_valid' is set. */
+ int ifindex;
+ uint8_t etheraddr[ETH_ADDR_LEN];
+ struct in_addr address, netmask;
+ struct in6_addr in6;
+ int mtu;
+ int carrier;
+ bool is_internal; /* Is this an openvswitch internal device? */
+ bool is_tap; /* Is this a tuntap device? */
+ uint32_t kbits_rate; /* Policing data. */
+ uint32_t kbits_burst;
+
+ union {
+ struct tap_state tap;
+ } state;
+};
+
+struct netdev_linux {
+ struct netdev netdev;
+ int fd;
+};
+
+/* An AF_INET socket (used for ioctl operations). */
+static int af_inet_sock = -1;
+
+struct netdev_linux_notifier {
+ struct netdev_notifier notifier;
+ struct list node;
+};
+
+static struct shash netdev_linux_notifiers =
+ SHASH_INITIALIZER(&netdev_linux_notifiers);
+static struct rtnetlink_notifier netdev_linux_poll_notifier;
+
+/* This is set pretty low because we probably won't learn anything from the
+ * additional log messages. */
+static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
+
+static int netdev_linux_init(void);
+
+static int netdev_linux_do_ethtool(const char *name, struct ethtool_cmd *,
+ int cmd, const char *cmd_name);
+static int netdev_linux_do_ioctl(const char *name, struct ifreq *, int cmd,
+ const char *cmd_name);
+static int netdev_linux_get_ipv4(const struct netdev *, struct in_addr *,
+ int cmd, const char *cmd_name);
+static int get_flags(const struct netdev *, int *flagsp);
+static int set_flags(struct netdev *, int flags);
+static int do_get_ifindex(const char *netdev_name);
+static int get_ifindex(const struct netdev *, int *ifindexp);
+static int do_set_addr(struct netdev *netdev,
+ int ioctl_nr, const char *ioctl_name,
+ struct in_addr addr);
+static int get_etheraddr(const char *netdev_name, uint8_t ea[ETH_ADDR_LEN]);
+static int set_etheraddr(const char *netdev_name, int hwaddr_family,
+ const uint8_t[ETH_ADDR_LEN]);
+static int get_stats_via_netlink(int ifindex, struct netdev_stats *stats);
+static int get_stats_via_proc(const char *netdev_name, struct netdev_stats *stats);
+static int get_rtnl_sock(struct nl_sock **);
+
+static bool
+is_netdev_linux_class(const struct netdev_class *netdev_class)
+{
+ return netdev_class->init == netdev_linux_init;
+}
+
+static struct netdev_dev_linux *
+netdev_dev_linux_cast(const struct netdev_dev *netdev_dev)
+{
+ const struct netdev_class *netdev_class = netdev_dev_get_class(netdev_dev);
+ assert(is_netdev_linux_class(netdev_class));
+
+ return CONTAINER_OF(netdev_dev, struct netdev_dev_linux, netdev_dev);
+}
+
+static struct netdev_linux *
+netdev_linux_cast(const struct netdev *netdev)
+{
+ struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
+ const struct netdev_class *netdev_class = netdev_dev_get_class(netdev_dev);
+ assert(is_netdev_linux_class(netdev_class));
-/* rtnetlink socket. */
-static struct nl_sock *rtnl_sock;
+ return CONTAINER_OF(netdev, struct netdev_linux, netdev);
+}
+
+static int
+netdev_linux_init(void)
+{
+ static int status = -1;
+ if (status < 0) {
+ af_inet_sock = socket(AF_INET, SOCK_DGRAM, 0);
+ status = af_inet_sock >= 0 ? 0 : errno;
+ if (status) {
+ VLOG_ERR("failed to create inet socket: %s", strerror(status));
+ }
+ }
+ return status;
+}
+
+static void
+netdev_linux_run(void)
+{
+ rtnetlink_notifier_run();
+}
+
+static void
+netdev_linux_wait(void)
+{
+ rtnetlink_notifier_wait();
+}
+
+static void
+netdev_linux_cache_cb(const struct rtnetlink_change *change,
+ void *aux OVS_UNUSED)
+{
+ struct netdev_dev_linux *dev;
+ if (change) {
+ struct netdev_dev *base_dev = netdev_dev_from_name(change->ifname);
+ if (base_dev) {
+ const struct netdev_class *netdev_class =
+ netdev_dev_get_class(base_dev);
-/* All registered notifiers. */
-static struct list all_notifiers = LIST_INITIALIZER(&all_notifiers);
+ if (is_netdev_linux_class(netdev_class)) {
+ dev = netdev_dev_linux_cast(base_dev);
+ dev->cache_valid = 0;
+ }
+ }
+ } else {
+ struct shash device_shash;
+ struct shash_node *node;
-static void linux_netdev_report_change(const struct nlmsghdr *,
- const struct ifinfomsg *,
- struct nlattr *attrs[]);
-static void linux_netdev_report_notify_error(int error);
+ shash_init(&device_shash);
+ netdev_dev_get_devices(&netdev_linux_class, &device_shash);
+ SHASH_FOR_EACH (node, &device_shash) {
+ dev = node->data;
+ dev->cache_valid = 0;
+ }
+ shash_destroy(&device_shash);
+ }
+}
-int
-linux_netdev_notifier_register(struct linux_netdev_notifier *notifier,
- linux_netdev_notify_func *cb, void *aux)
+/* Creates the netdev device of 'type' with 'name'. */
+static int
+netdev_linux_create_system(const char *name, const char *type OVS_UNUSED,
+ const struct shash *args, struct netdev_dev **netdev_devp)
{
- if (!rtnl_sock) {
- int error = nl_sock_create(NETLINK_ROUTE, RTNLGRP_LINK, 0, 0,
- &rtnl_sock);
+ struct netdev_dev_linux *netdev_dev;
+ int error;
+
+ if (!shash_is_empty(args)) {
+ VLOG_WARN("%s: arguments for system devices should be empty", name);
+ }
+
+ if (!cache_notifier_refcount) {
+ error = rtnetlink_notifier_register(&netdev_linux_cache_notifier,
+ netdev_linux_cache_cb, NULL);
if (error) {
- VLOG_WARN("could not create rtnetlink socket: %s",
- strerror(error));
return error;
}
- } else {
- /* Catch up on notification work so that the new notifier won't
- * receive any stale notifications. */
- linux_netdev_notifier_run();
+ }
+ cache_notifier_refcount++;
+
+ netdev_dev = xzalloc(sizeof *netdev_dev);
+ netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_linux_class);
+
+ *netdev_devp = &netdev_dev->netdev_dev;
+ return 0;
+}
+
+/* For most types of netdevs we open the device for each call of
+ * netdev_open(). However, this is not the case with tap devices,
+ * since it is only possible to open the device once. In this
+ * situation we share a single file descriptor, and consequently
+ * buffers, across all readers. Therefore once data is read it will
+ * be unavailable to other reads for tap devices. */
+static int
+netdev_linux_create_tap(const char *name, const char *type OVS_UNUSED,
+ const struct shash *args, struct netdev_dev **netdev_devp)
+{
+ struct netdev_dev_linux *netdev_dev;
+ struct tap_state *state;
+ static const char tap_dev[] = "/dev/net/tun";
+ struct ifreq ifr;
+ int error;
+
+ if (!shash_is_empty(args)) {
+ VLOG_WARN("%s: arguments for TAP devices should be empty", name);
+ }
+
+ netdev_dev = xzalloc(sizeof *netdev_dev);
+ state = &netdev_dev->state.tap;
+
+ /* Open tap device. */
+ state->fd = open(tap_dev, O_RDWR);
+ if (state->fd < 0) {
+ error = errno;
+ VLOG_WARN("opening \"%s\" failed: %s", tap_dev, strerror(error));
+ goto error;
+ }
+
+ /* Create tap device. */
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+ strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
+ if (ioctl(state->fd, TUNSETIFF, &ifr) == -1) {
+ VLOG_WARN("%s: creating tap device failed: %s", name,
+ strerror(errno));
+ error = errno;
+ goto error;
}
- list_push_back(&all_notifiers, ¬ifier->node);
- notifier->error = 0;
- notifier->cb = cb;
- notifier->aux = aux;
+ /* Make non-blocking. */
+ error = set_nonblocking(state->fd);
+ if (error) {
+ goto error;
+ }
+
+ netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_tap_class);
+ *netdev_devp = &netdev_dev->netdev_dev;
return 0;
+
+error:
+ free(netdev_dev);
+ return error;
+}
+
+static void
+destroy_tap(struct netdev_dev_linux *netdev_dev)
+{
+ struct tap_state *state = &netdev_dev->state.tap;
+
+ if (state->fd >= 0) {
+ close(state->fd);
+ }
}
-void
-linux_netdev_notifier_unregister(struct linux_netdev_notifier *notifier)
+/* Destroys the netdev device 'netdev_dev_'. */
+static void
+netdev_linux_destroy(struct netdev_dev *netdev_dev_)
{
- list_remove(¬ifier->node);
- if (list_is_empty(&all_notifiers)) {
- nl_sock_destroy(rtnl_sock);
- rtnl_sock = NULL;
+ struct netdev_dev_linux *netdev_dev = netdev_dev_linux_cast(netdev_dev_);
+ const char *type = netdev_dev_get_type(netdev_dev_);
+
+ if (!strcmp(type, "system")) {
+ cache_notifier_refcount--;
+
+ if (!cache_notifier_refcount) {
+ rtnetlink_notifier_unregister(&netdev_linux_cache_notifier);
+ }
+ } else if (!strcmp(type, "tap")) {
+ destroy_tap(netdev_dev);
}
+
+ free(netdev_dev);
}
-int
-linux_netdev_notifier_get_error(struct linux_netdev_notifier *notifier)
+static int
+netdev_linux_open(struct netdev_dev *netdev_dev_, int ethertype,
+ struct netdev **netdevp)
{
- int error = notifier->error;
- notifier->error = 0;
+ struct netdev_dev_linux *netdev_dev = netdev_dev_linux_cast(netdev_dev_);
+ struct netdev_linux *netdev;
+ enum netdev_flags flags;
+ int error;
+
+ /* Allocate network device. */
+ netdev = xzalloc(sizeof *netdev);
+ netdev->fd = -1;
+ netdev_init(&netdev->netdev, netdev_dev_);
+
+ error = netdev_get_flags(&netdev->netdev, &flags);
+ if (error == ENODEV) {
+ goto error;
+ }
+
+ if (!strcmp(netdev_dev_get_type(netdev_dev_), "tap")) {
+ netdev->fd = netdev_dev->state.tap.fd;
+ } else if (ethertype != NETDEV_ETH_TYPE_NONE) {
+ struct sockaddr_ll sll;
+ int protocol;
+ int ifindex;
+
+ /* Create file descriptor. */
+ protocol = (ethertype == NETDEV_ETH_TYPE_ANY ? ETH_P_ALL
+ : ethertype == NETDEV_ETH_TYPE_802_2 ? ETH_P_802_2
+ : ethertype);
+ netdev->fd = socket(PF_PACKET, SOCK_RAW, htons(protocol));
+ if (netdev->fd < 0) {
+ error = errno;
+ goto error;
+ }
+
+ /* Set non-blocking mode. */
+ error = set_nonblocking(netdev->fd);
+ if (error) {
+ goto error;
+ }
+
+ /* Get ethernet device index. */
+ error = get_ifindex(&netdev->netdev, &ifindex);
+ if (error) {
+ goto error;
+ }
+
+ /* Bind to specific ethernet device. */
+ memset(&sll, 0, sizeof sll);
+ sll.sll_family = AF_PACKET;
+ sll.sll_ifindex = ifindex;
+ if (bind(netdev->fd,
+ (struct sockaddr *) &sll, sizeof sll) < 0) {
+ error = errno;
+ VLOG_ERR("bind to %s failed: %s", netdev_dev_get_name(netdev_dev_),
+ strerror(error));
+ goto error;
+ }
+
+ /* Between the socket() and bind() calls above, the socket receives all
+ * packets of the requested type on all system interfaces. We do not
+ * want to receive that data, but there is no way to avoid it. So we
+ * must now drain out the receive queue. */
+ error = drain_rcvbuf(netdev->fd);
+ if (error) {
+ goto error;
+ }
+ }
+
+ *netdevp = &netdev->netdev;
+ return 0;
+
+error:
+ netdev_uninit(&netdev->netdev, true);
return error;
}
-int
-linux_netdev_notifier_peek_error(const struct linux_netdev_notifier *notifier)
+/* Closes and destroys 'netdev'. */
+static void
+netdev_linux_close(struct netdev *netdev_)
{
- return notifier->error;
+ struct netdev_linux *netdev = netdev_linux_cast(netdev_);
+
+ if (netdev->fd > 0 && strcmp(netdev_get_type(netdev_), "tap")) {
+ close(netdev->fd);
+ }
+ free(netdev);
}
-static const struct nl_policy rtnlgrp_link_policy[] = {
- [IFLA_IFNAME] = { .type = NL_A_STRING },
- [IFLA_MASTER] = { .type = NL_A_U32, .optional = true },
-};
+/* Initializes 'svec' with a list of the names of all known network devices. */
+static int
+netdev_linux_enumerate(struct svec *svec)
+{
+ struct if_nameindex *names;
+
+ names = if_nameindex();
+ if (names) {
+ size_t i;
+
+ for (i = 0; names[i].if_name != NULL; i++) {
+ svec_add(svec, names[i].if_name);
+ }
+ if_freenameindex(names);
+ return 0;
+ } else {
+ VLOG_WARN("could not obtain list of network device names: %s",
+ strerror(errno));
+ return errno;
+ }
+}
-void
-linux_netdev_notifier_run(void)
+static int
+netdev_linux_recv(struct netdev *netdev_, void *data, size_t size)
{
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ struct netdev_linux *netdev = netdev_linux_cast(netdev_);
- if (!rtnl_sock) {
- return;
+ if (netdev->fd < 0) {
+ /* Device was opened with NETDEV_ETH_TYPE_NONE. */
+ return -EAGAIN;
}
for (;;) {
- struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
- struct ofpbuf *buf;
- int error;
+ ssize_t retval = read(netdev->fd, data, size);
+ if (retval >= 0) {
+ return retval;
+ } else if (errno != EINTR) {
+ if (errno != EAGAIN) {
+ VLOG_WARN_RL(&rl, "error receiving Ethernet packet on %s: %s",
+ strerror(errno), netdev_get_name(netdev_));
+ }
+ return -errno;
+ }
+ }
+}
- error = nl_sock_recv(rtnl_sock, &buf, false);
- if (!error) {
- if (nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
- rtnlgrp_link_policy,
- attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
- struct ifinfomsg *ifinfo;
+/* Registers with the poll loop to wake up from the next call to poll_block()
+ * when a packet is ready to be received with netdev_recv() on 'netdev'. */
+static void
+netdev_linux_recv_wait(struct netdev *netdev_)
+{
+ struct netdev_linux *netdev = netdev_linux_cast(netdev_);
+ if (netdev->fd >= 0) {
+ poll_fd_wait(netdev->fd, POLLIN);
+ }
+}
- ifinfo = (void *) ((char *) buf->data + NLMSG_HDRLEN);
- linux_netdev_report_change(buf->data, ifinfo, attrs);
- } else {
- VLOG_WARN_RL(&rl, "received bad rtnl message");
- linux_netdev_report_notify_error(ENOBUFS);
+/* Discards all packets waiting to be received from 'netdev'. */
+static int
+netdev_linux_drain(struct netdev *netdev_)
+{
+ struct netdev_linux *netdev = netdev_linux_cast(netdev_);
+ if (netdev->fd < 0) {
+ return 0;
+ } else if (!strcmp(netdev_get_type(netdev_), "tap")) {
+ struct ifreq ifr;
+ int error = netdev_linux_do_ioctl(netdev_get_name(netdev_), &ifr,
+ SIOCGIFTXQLEN, "SIOCGIFTXQLEN");
+ if (error) {
+ return error;
+ }
+ drain_fd(netdev->fd, ifr.ifr_qlen);
+ return 0;
+ } else {
+ return drain_rcvbuf(netdev->fd);
+ }
+}
+
+/* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
+ * errno value. Returns EAGAIN without blocking if the packet cannot be queued
+ * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
+ * the packet is too big or too small to transmit on the device.
+ *
+ * The caller retains ownership of 'buffer' in all cases.
+ *
+ * The kernel maintains a packet transmission queue, so the caller is not
+ * expected to do additional queuing of packets. */
+static int
+netdev_linux_send(struct netdev *netdev_, const void *data, size_t size)
+{
+ struct netdev_linux *netdev = netdev_linux_cast(netdev_);
+
+ /* XXX should support sending even if 'ethertype' was NETDEV_ETH_TYPE_NONE.
+ */
+ if (netdev->fd < 0) {
+ return EPIPE;
+ }
+
+ for (;;) {
+ ssize_t retval = write(netdev->fd, data, size);
+ if (retval < 0) {
+ /* The Linux AF_PACKET implementation never blocks waiting for room
+ * for packets, instead returning ENOBUFS. Translate this into
+ * EAGAIN for the caller. */
+ if (errno == ENOBUFS) {
+ return EAGAIN;
+ } else if (errno == EINTR) {
+ continue;
+ } else if (errno != EAGAIN) {
+ VLOG_WARN_RL(&rl, "error sending Ethernet packet on %s: %s",
+ netdev_get_name(netdev_), strerror(errno));
}
- ofpbuf_delete(buf);
- } else if (error == EAGAIN) {
- return;
+ return errno;
+ } else if (retval != size) {
+ VLOG_WARN_RL(&rl, "sent partial Ethernet packet (%zd bytes of "
+ "%zu) on %s", retval, size, netdev_get_name(netdev_));
+ return EMSGSIZE;
} else {
- if (error == ENOBUFS) {
- VLOG_WARN_RL(&rl, "rtnetlink receive buffer overflowed");
+ return 0;
+ }
+ }
+}
+
+/* Registers with the poll loop to wake up from the next call to poll_block()
+ * when the packet transmission queue has sufficient room to transmit a packet
+ * with netdev_send().
+ *
+ * The kernel maintains a packet transmission queue, so the client is not
+ * expected to do additional queuing of packets. Thus, this function is
+ * unlikely to ever be used. It is included for completeness. */
+static void
+netdev_linux_send_wait(struct netdev *netdev_)
+{
+ struct netdev_linux *netdev = netdev_linux_cast(netdev_);
+ if (netdev->fd < 0) {
+ /* Nothing to do. */
+ } else if (strcmp(netdev_get_type(netdev_), "tap")) {
+ poll_fd_wait(netdev->fd, POLLOUT);
+ } else {
+ /* TAP device always accepts packets.*/
+ poll_immediate_wake();
+ }
+}
+
+/* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
+ * otherwise a positive errno value. */
+static int
+netdev_linux_set_etheraddr(struct netdev *netdev_,
+ const uint8_t mac[ETH_ADDR_LEN])
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+ int error;
+
+ if (!(netdev_dev->cache_valid & VALID_ETHERADDR)
+ || !eth_addr_equals(netdev_dev->etheraddr, mac)) {
+ error = set_etheraddr(netdev_get_name(netdev_), ARPHRD_ETHER, mac);
+ if (!error) {
+ netdev_dev->cache_valid |= VALID_ETHERADDR;
+ memcpy(netdev_dev->etheraddr, mac, ETH_ADDR_LEN);
+ }
+ } else {
+ error = 0;
+ }
+ return error;
+}
+
+/* Returns a pointer to 'netdev''s MAC address. The caller must not modify or
+ * free the returned buffer. */
+static int
+netdev_linux_get_etheraddr(const struct netdev *netdev_,
+ uint8_t mac[ETH_ADDR_LEN])
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+ if (!(netdev_dev->cache_valid & VALID_ETHERADDR)) {
+ int error = get_etheraddr(netdev_get_name(netdev_),
+ netdev_dev->etheraddr);
+ if (error) {
+ return error;
+ }
+ netdev_dev->cache_valid |= VALID_ETHERADDR;
+ }
+ memcpy(mac, netdev_dev->etheraddr, ETH_ADDR_LEN);
+ return 0;
+}
+
+/* Returns the maximum size of transmitted (and received) packets on 'netdev',
+ * in bytes, not including the hardware header; thus, this is typically 1500
+ * bytes for Ethernet devices. */
+static int
+netdev_linux_get_mtu(const struct netdev *netdev_, int *mtup)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+ if (!(netdev_dev->cache_valid & VALID_MTU)) {
+ struct ifreq ifr;
+ int error;
+
+ error = netdev_linux_do_ioctl(netdev_get_name(netdev_), &ifr,
+ SIOCGIFMTU, "SIOCGIFMTU");
+ if (error) {
+ return error;
+ }
+ netdev_dev->mtu = ifr.ifr_mtu;
+ netdev_dev->cache_valid |= VALID_MTU;
+ }
+ *mtup = netdev_dev->mtu;
+ return 0;
+}
+
+/* Returns the ifindex of 'netdev', if successful, as a positive number.
+ * On failure, returns a negative errno value. */
+static int
+netdev_linux_get_ifindex(const struct netdev *netdev)
+{
+ int ifindex, error;
+
+ error = get_ifindex(netdev, &ifindex);
+ return error ? -error : ifindex;
+}
+
+static int
+netdev_linux_get_carrier(const struct netdev *netdev_, bool *carrier)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+ int error = 0;
+ char *fn = NULL;
+ int fd = -1;
+
+ if (!(netdev_dev->cache_valid & VALID_CARRIER)) {
+ char line[8];
+ int retval;
+
+ fn = xasprintf("/sys/class/net/%s/carrier",
+ netdev_get_name(netdev_));
+ fd = open(fn, O_RDONLY);
+ if (fd < 0) {
+ error = errno;
+ VLOG_WARN_RL(&rl, "%s: open failed: %s", fn, strerror(error));
+ goto exit;
+ }
+
+ retval = read(fd, line, sizeof line);
+ if (retval < 0) {
+ error = errno;
+ if (error == EINVAL) {
+ /* This is the normal return value when we try to check carrier
+ * if the network device is not up. */
} else {
- VLOG_WARN_RL(&rl, "error reading rtnetlink socket: %s",
- strerror(error));
+ VLOG_WARN_RL(&rl, "%s: read failed: %s", fn, strerror(error));
}
- linux_netdev_report_notify_error(error);
+ goto exit;
+ } else if (retval == 0) {
+ error = EPROTO;
+ VLOG_WARN_RL(&rl, "%s: unexpected end of file", fn);
+ goto exit;
}
+
+ if (line[0] != '0' && line[0] != '1') {
+ error = EPROTO;
+ VLOG_WARN_RL(&rl, "%s: value is %c (expected 0 or 1)",
+ fn, line[0]);
+ goto exit;
+ }
+ netdev_dev->carrier = line[0] != '0';
+ netdev_dev->cache_valid |= VALID_CARRIER;
+ }
+ *carrier = netdev_dev->carrier;
+ error = 0;
+
+exit:
+ if (fd >= 0) {
+ close(fd);
}
+ free(fn);
+ return error;
}
-void
-linux_netdev_notifier_wait(void)
+/* Check whether we can we use RTM_GETLINK to get network device statistics.
+ * In pre-2.6.19 kernels, this was only available if wireless extensions were
+ * enabled. */
+static bool
+check_for_working_netlink_stats(void)
{
- if (rtnl_sock) {
- nl_sock_wait(rtnl_sock, POLLIN);
+ /* Decide on the netdev_get_stats() implementation to use. Netlink is
+ * preferable, so if that works, we'll use it. */
+ int ifindex = do_get_ifindex("lo");
+ if (ifindex < 0) {
+ VLOG_WARN("failed to get ifindex for lo, "
+ "obtaining netdev stats from proc");
+ return false;
+ } else {
+ struct netdev_stats stats;
+ int error = get_stats_via_netlink(ifindex, &stats);
+ if (!error) {
+ VLOG_DBG("obtaining netdev stats via rtnetlink");
+ return true;
+ } else {
+ VLOG_INFO("RTM_GETLINK failed (%s), obtaining netdev stats "
+ "via proc (you are probably running a pre-2.6.19 "
+ "kernel)", strerror(error));
+ return false;
+ }
}
}
+/* Brings the 'is_internal' and 'is_tap' members of 'netdev_dev' up-to-date. */
static void
-linux_netdev_report_change(const struct nlmsghdr *nlmsg,
- const struct ifinfomsg *ifinfo,
- struct nlattr *attrs[])
+netdev_linux_update_is_pseudo(struct netdev_dev_linux *netdev_dev)
{
- struct linux_netdev_notifier *notifier;
- struct linux_netdev_change change;
-
- COVERAGE_INC(linux_netdev_changed);
+ if (!(netdev_dev->cache_valid & VALID_IS_PSEUDO)) {
+ const char *name = netdev_dev_get_name(&netdev_dev->netdev_dev);
+ const char *type = netdev_dev_get_type(&netdev_dev->netdev_dev);
+
+ netdev_dev->is_tap = !strcmp(type, "tap");
+ netdev_dev->is_internal = false;
+ if (!netdev_dev->is_tap) {
+ struct ethtool_drvinfo drvinfo;
+ int error;
- change.nlmsg_type = nlmsg->nlmsg_type;
- change.ifi_index = ifinfo->ifi_index;
- change.ifname = nl_attr_get_string(attrs[IFLA_IFNAME]);
- change.master_ifindex = (attrs[IFLA_MASTER]
- ? nl_attr_get_u32(attrs[IFLA_MASTER]) : 0);
+ memset(&drvinfo, 0, sizeof drvinfo);
+ error = netdev_linux_do_ethtool(name,
+ (struct ethtool_cmd *)&drvinfo,
+ ETHTOOL_GDRVINFO,
+ "ETHTOOL_GDRVINFO");
- LIST_FOR_EACH (notifier, struct linux_netdev_notifier, node,
- &all_notifiers) {
- if (!notifier->error) {
- notifier->cb(&change, notifier->aux);
+ if (!error && !strcmp(drvinfo.driver, "openvswitch")) {
+ netdev_dev->is_internal = true;
+ }
}
+
+ netdev_dev->cache_valid |= VALID_IS_PSEUDO;
}
}
-static void
-linux_netdev_report_notify_error(int error)
+/* Retrieves current device stats for 'netdev'.
+ *
+ * XXX All of the members of struct netdev_stats are 64 bits wide, but on
+ * 32-bit architectures the Linux network stats are only 32 bits. */
+static int
+netdev_linux_get_stats(const struct netdev *netdev_,
+ struct netdev_stats *stats)
{
- struct linux_netdev_notifier *notifier;
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+ static int use_netlink_stats = -1;
+ int error;
+ struct netdev_stats raw_stats;
+ struct netdev_stats *collect_stats = stats;
+
+ COVERAGE_INC(netdev_get_stats);
+
+ netdev_linux_update_is_pseudo(netdev_dev);
+ if (netdev_dev->is_internal) {
+ collect_stats = &raw_stats;
+ }
+
+ if (use_netlink_stats < 0) {
+ use_netlink_stats = check_for_working_netlink_stats();
+ }
+ if (use_netlink_stats) {
+ int ifindex;
- LIST_FOR_EACH (notifier, struct linux_netdev_notifier, node,
- &all_notifiers) {
- if (error != ENOBUFS || !notifier->error) {
- notifier->error = error;
+ error = get_ifindex(netdev_, &ifindex);
+ if (!error) {
+ error = get_stats_via_netlink(ifindex, collect_stats);
}
+ } else {
+ error = get_stats_via_proc(netdev_get_name(netdev_), collect_stats);
+ }
+
+ /* If this port is an internal port then the transmit and receive stats
+ * will appear to be swapped relative to the other ports since we are the
+ * one sending the data, not a remote computer. For consistency, we swap
+ * them back here. */
+ if (!error && (netdev_dev->is_internal || netdev_dev->is_tap)) {
+ stats->rx_packets = raw_stats.tx_packets;
+ stats->tx_packets = raw_stats.rx_packets;
+ stats->rx_bytes = raw_stats.tx_bytes;
+ stats->tx_bytes = raw_stats.rx_bytes;
+ stats->rx_errors = raw_stats.tx_errors;
+ stats->tx_errors = raw_stats.rx_errors;
+ stats->rx_dropped = raw_stats.tx_dropped;
+ stats->tx_dropped = raw_stats.rx_dropped;
+ stats->multicast = raw_stats.multicast;
+ stats->collisions = raw_stats.collisions;
+ stats->rx_length_errors = 0;
+ stats->rx_over_errors = 0;
+ stats->rx_crc_errors = 0;
+ stats->rx_frame_errors = 0;
+ stats->rx_fifo_errors = 0;
+ stats->rx_missed_errors = 0;
+ stats->tx_aborted_errors = 0;
+ stats->tx_carrier_errors = 0;
+ stats->tx_fifo_errors = 0;
+ stats->tx_heartbeat_errors = 0;
+ stats->tx_window_errors = 0;
+ }
+
+ return error;
+}
+
+static int
+netdev_linux_set_stats(struct netdev *netdev,
+ const struct netdev_stats *stats)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev));
+ struct internal_dev_stats dp_dev_stats;
+ struct ifreq ifr;
+
+ /* We must reject this call if 'netdev' is not an Open vSwitch internal
+ * port, because the ioctl that we are about to execute is in the "device
+ * private ioctls" range, which means that executing it on a device that
+ * is not the type we expect could do any random thing.
+ *
+ * (Amusingly, these ioctl numbers are commented "THESE IOCTLS ARE
+ * _DEPRECATED_ AND WILL DISAPPEAR IN 2.5.X" in linux/sockios.h. I guess
+ * DaveM is a little behind on that.) */
+ netdev_linux_update_is_pseudo(netdev_dev);
+ if (!netdev_dev->is_internal) {
+ return EOPNOTSUPP;
+ }
+
+ /* This actually only sets the *offset* that the dp_dev applies, but in our
+ * usage for fake bond devices the dp_dev never has any traffic of it own
+ * so it has the same effect. */
+ dp_dev_stats.rx_packets = stats->rx_packets;
+ dp_dev_stats.rx_bytes = stats->rx_bytes;
+ dp_dev_stats.tx_packets = stats->tx_packets;
+ dp_dev_stats.tx_bytes = stats->tx_bytes;
+ ifr.ifr_data = (void *) &dp_dev_stats;
+ return netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr,
+ INTERNAL_DEV_SET_STATS,
+ "INTERNAL_DEV_SET_STATS");
+}
+
+/* Stores the features supported by 'netdev' into each of '*current',
+ * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
+ * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
+ * successful, otherwise a positive errno value. */
+static int
+netdev_linux_get_features(struct netdev *netdev,
+ uint32_t *current, uint32_t *advertised,
+ uint32_t *supported, uint32_t *peer)
+{
+ struct ethtool_cmd ecmd;
+ int error;
+
+ memset(&ecmd, 0, sizeof ecmd);
+ error = netdev_linux_do_ethtool(netdev_get_name(netdev), &ecmd,
+ ETHTOOL_GSET, "ETHTOOL_GSET");
+ if (error) {
+ return error;
+ }
+
+ /* Supported features. */
+ *supported = 0;
+ if (ecmd.supported & SUPPORTED_10baseT_Half) {
+ *supported |= OFPPF_10MB_HD;
+ }
+ if (ecmd.supported & SUPPORTED_10baseT_Full) {
+ *supported |= OFPPF_10MB_FD;
+ }
+ if (ecmd.supported & SUPPORTED_100baseT_Half) {
+ *supported |= OFPPF_100MB_HD;
+ }
+ if (ecmd.supported & SUPPORTED_100baseT_Full) {
+ *supported |= OFPPF_100MB_FD;
+ }
+ if (ecmd.supported & SUPPORTED_1000baseT_Half) {
+ *supported |= OFPPF_1GB_HD;
+ }
+ if (ecmd.supported & SUPPORTED_1000baseT_Full) {
+ *supported |= OFPPF_1GB_FD;
+ }
+ if (ecmd.supported & SUPPORTED_10000baseT_Full) {
+ *supported |= OFPPF_10GB_FD;
+ }
+ if (ecmd.supported & SUPPORTED_TP) {
+ *supported |= OFPPF_COPPER;
+ }
+ if (ecmd.supported & SUPPORTED_FIBRE) {
+ *supported |= OFPPF_FIBER;
+ }
+ if (ecmd.supported & SUPPORTED_Autoneg) {
+ *supported |= OFPPF_AUTONEG;
+ }
+ if (ecmd.supported & SUPPORTED_Pause) {
+ *supported |= OFPPF_PAUSE;
}
+ if (ecmd.supported & SUPPORTED_Asym_Pause) {
+ *supported |= OFPPF_PAUSE_ASYM;
+ }
+
+ /* Advertised features. */
+ *advertised = 0;
+ if (ecmd.advertising & ADVERTISED_10baseT_Half) {
+ *advertised |= OFPPF_10MB_HD;
+ }
+ if (ecmd.advertising & ADVERTISED_10baseT_Full) {
+ *advertised |= OFPPF_10MB_FD;
+ }
+ if (ecmd.advertising & ADVERTISED_100baseT_Half) {
+ *advertised |= OFPPF_100MB_HD;
+ }
+ if (ecmd.advertising & ADVERTISED_100baseT_Full) {
+ *advertised |= OFPPF_100MB_FD;
+ }
+ if (ecmd.advertising & ADVERTISED_1000baseT_Half) {
+ *advertised |= OFPPF_1GB_HD;
+ }
+ if (ecmd.advertising & ADVERTISED_1000baseT_Full) {
+ *advertised |= OFPPF_1GB_FD;
+ }
+ if (ecmd.advertising & ADVERTISED_10000baseT_Full) {
+ *advertised |= OFPPF_10GB_FD;
+ }
+ if (ecmd.advertising & ADVERTISED_TP) {
+ *advertised |= OFPPF_COPPER;
+ }
+ if (ecmd.advertising & ADVERTISED_FIBRE) {
+ *advertised |= OFPPF_FIBER;
+ }
+ if (ecmd.advertising & ADVERTISED_Autoneg) {
+ *advertised |= OFPPF_AUTONEG;
+ }
+ if (ecmd.advertising & ADVERTISED_Pause) {
+ *advertised |= OFPPF_PAUSE;
+ }
+ if (ecmd.advertising & ADVERTISED_Asym_Pause) {
+ *advertised |= OFPPF_PAUSE_ASYM;
+ }
+
+ /* Current settings. */
+ if (ecmd.speed == SPEED_10) {
+ *current = ecmd.duplex ? OFPPF_10MB_FD : OFPPF_10MB_HD;
+ } else if (ecmd.speed == SPEED_100) {
+ *current = ecmd.duplex ? OFPPF_100MB_FD : OFPPF_100MB_HD;
+ } else if (ecmd.speed == SPEED_1000) {
+ *current = ecmd.duplex ? OFPPF_1GB_FD : OFPPF_1GB_HD;
+ } else if (ecmd.speed == SPEED_10000) {
+ *current = OFPPF_10GB_FD;
+ } else {
+ *current = 0;
+ }
+
+ if (ecmd.port == PORT_TP) {
+ *current |= OFPPF_COPPER;
+ } else if (ecmd.port == PORT_FIBRE) {
+ *current |= OFPPF_FIBER;
+ }
+
+ if (ecmd.autoneg) {
+ *current |= OFPPF_AUTONEG;
+ }
+
+ /* Peer advertisements. */
+ *peer = 0; /* XXX */
+
+ return 0;
+}
+
+/* Set the features advertised by 'netdev' to 'advertise'. */
+static int
+netdev_linux_set_advertisements(struct netdev *netdev, uint32_t advertise)
+{
+ struct ethtool_cmd ecmd;
+ int error;
+
+ memset(&ecmd, 0, sizeof ecmd);
+ error = netdev_linux_do_ethtool(netdev_get_name(netdev), &ecmd,
+ ETHTOOL_GSET, "ETHTOOL_GSET");
+ if (error) {
+ return error;
+ }
+
+ ecmd.advertising = 0;
+ if (advertise & OFPPF_10MB_HD) {
+ ecmd.advertising |= ADVERTISED_10baseT_Half;
+ }
+ if (advertise & OFPPF_10MB_FD) {
+ ecmd.advertising |= ADVERTISED_10baseT_Full;
+ }
+ if (advertise & OFPPF_100MB_HD) {
+ ecmd.advertising |= ADVERTISED_100baseT_Half;
+ }
+ if (advertise & OFPPF_100MB_FD) {
+ ecmd.advertising |= ADVERTISED_100baseT_Full;
+ }
+ if (advertise & OFPPF_1GB_HD) {
+ ecmd.advertising |= ADVERTISED_1000baseT_Half;
+ }
+ if (advertise & OFPPF_1GB_FD) {
+ ecmd.advertising |= ADVERTISED_1000baseT_Full;
+ }
+ if (advertise & OFPPF_10GB_FD) {
+ ecmd.advertising |= ADVERTISED_10000baseT_Full;
+ }
+ if (advertise & OFPPF_COPPER) {
+ ecmd.advertising |= ADVERTISED_TP;
+ }
+ if (advertise & OFPPF_FIBER) {
+ ecmd.advertising |= ADVERTISED_FIBRE;
+ }
+ if (advertise & OFPPF_AUTONEG) {
+ ecmd.advertising |= ADVERTISED_Autoneg;
+ }
+ if (advertise & OFPPF_PAUSE) {
+ ecmd.advertising |= ADVERTISED_Pause;
+ }
+ if (advertise & OFPPF_PAUSE_ASYM) {
+ ecmd.advertising |= ADVERTISED_Asym_Pause;
+ }
+ return netdev_linux_do_ethtool(netdev_get_name(netdev), &ecmd,
+ ETHTOOL_SSET, "ETHTOOL_SSET");
+}
+
+/* If 'netdev_name' is the name of a VLAN network device (e.g. one created with
+ * vconfig(8)), sets '*vlan_vid' to the VLAN VID associated with that device
+ * and returns 0. Otherwise returns a errno value (specifically ENOENT if
+ * 'netdev_name' is the name of a network device that is not a VLAN device) and
+ * sets '*vlan_vid' to -1. */
+static int
+netdev_linux_get_vlan_vid(const struct netdev *netdev, int *vlan_vid)
+{
+ const char *netdev_name = netdev_get_name(netdev);
+ struct ds line = DS_EMPTY_INITIALIZER;
+ FILE *stream = NULL;
+ int error;
+ char *fn;
+
+ COVERAGE_INC(netdev_get_vlan_vid);
+ fn = xasprintf("/proc/net/vlan/%s", netdev_name);
+ stream = fopen(fn, "r");
+ if (!stream) {
+ error = errno;
+ goto done;
+ }
+
+ if (ds_get_line(&line, stream)) {
+ if (ferror(stream)) {
+ error = errno;
+ VLOG_ERR_RL(&rl, "error reading \"%s\": %s", fn, strerror(errno));
+ } else {
+ error = EPROTO;
+ VLOG_ERR_RL(&rl, "unexpected end of file reading \"%s\"", fn);
+ }
+ goto done;
+ }
+
+ if (!sscanf(ds_cstr(&line), "%*s VID: %d", vlan_vid)) {
+ error = EPROTO;
+ VLOG_ERR_RL(&rl, "parse error reading \"%s\" line 1: \"%s\"",
+ fn, ds_cstr(&line));
+ goto done;
+ }
+
+ error = 0;
+
+done:
+ free(fn);
+ if (stream) {
+ fclose(stream);
+ }
+ ds_destroy(&line);
+ if (error) {
+ *vlan_vid = -1;
+ }
+ return error;
+}
+
+#define POLICE_ADD_CMD "/sbin/tc qdisc add dev %s handle ffff: ingress"
+#define POLICE_CONFIG_CMD "/sbin/tc filter add dev %s parent ffff: protocol ip prio 50 u32 match ip src 0.0.0.0/0 police rate %dkbit burst %dk mtu 65535 drop flowid :1"
+
+/* Remove ingress policing from 'netdev'. Returns 0 if successful, otherwise a
+ * positive errno value.
+ *
+ * This function is equivalent to running
+ * /sbin/tc qdisc del dev %s handle ffff: ingress
+ * but it is much, much faster.
+ */
+static int
+netdev_linux_remove_policing(struct netdev *netdev)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev));
+ const char *netdev_name = netdev_get_name(netdev);
+
+ struct ofpbuf request;
+ struct ofpbuf *reply;
+ struct tcmsg *tcmsg;
+ struct nl_sock *rtnl_sock;
+ int ifindex;
+ int error;
+
+ error = get_ifindex(netdev, &ifindex);
+ if (error) {
+ return error;
+ }
+
+ error = get_rtnl_sock(&rtnl_sock);
+ if (error) {
+ return error;
+ }
+
+ ofpbuf_init(&request, 0);
+ nl_msg_put_nlmsghdr(&request, rtnl_sock, sizeof *tcmsg,
+ RTM_DELQDISC, NLM_F_REQUEST);
+ tcmsg = ofpbuf_put_zeros(&request, sizeof *tcmsg);
+ tcmsg->tcm_family = AF_UNSPEC;
+ tcmsg->tcm_ifindex = ifindex;
+ tcmsg->tcm_handle = 0xffff0000;
+ tcmsg->tcm_parent = TC_H_INGRESS;
+ nl_msg_put_string(&request, TCA_KIND, "ingress");
+ nl_msg_put_unspec(&request, TCA_OPTIONS, NULL, 0);
+ error = nl_sock_transact(rtnl_sock, &request, &reply);
+ ofpbuf_uninit(&request);
+ ofpbuf_delete(reply);
+ if (error && error != ENOENT) {
+ VLOG_WARN_RL(&rl, "%s: removing policing failed: %s",
+ netdev_name, strerror(error));
+ return error;
+ }
+
+ netdev_dev->kbits_rate = 0;
+ netdev_dev->kbits_burst = 0;
+ netdev_dev->cache_valid |= VALID_POLICING;
+ return 0;
+}
+
+/* Attempts to set input rate limiting (policing) policy. */
+static int
+netdev_linux_set_policing(struct netdev *netdev,
+ uint32_t kbits_rate, uint32_t kbits_burst)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev));
+ const char *netdev_name = netdev_get_name(netdev);
+ char command[1024];
+
+ COVERAGE_INC(netdev_set_policing);
+
+ kbits_burst = (!kbits_rate ? 0 /* Force to 0 if no rate specified. */
+ : !kbits_burst ? 1000 /* Default to 1000 kbits if 0. */
+ : kbits_burst); /* Stick with user-specified value. */
+
+ if (netdev_dev->cache_valid & VALID_POLICING
+ && netdev_dev->kbits_rate == kbits_rate
+ && netdev_dev->kbits_burst == kbits_burst) {
+ /* Assume that settings haven't changed since we last set them. */
+ return 0;
+ }
+
+ netdev_linux_remove_policing(netdev);
+ if (kbits_rate) {
+ snprintf(command, sizeof(command), POLICE_ADD_CMD, netdev_name);
+ if (system(command) != 0) {
+ VLOG_WARN_RL(&rl, "%s: problem adding policing", netdev_name);
+ return -1;
+ }
+
+ snprintf(command, sizeof(command), POLICE_CONFIG_CMD, netdev_name,
+ kbits_rate, kbits_burst);
+ if (system(command) != 0) {
+ VLOG_WARN_RL(&rl, "%s: problem configuring policing",
+ netdev_name);
+ return -1;
+ }
+
+ netdev_dev->kbits_rate = kbits_rate;
+ netdev_dev->kbits_burst = kbits_burst;
+ netdev_dev->cache_valid |= VALID_POLICING;
+ }
+
+ return 0;
+}
+
+static int
+netdev_linux_get_in4(const struct netdev *netdev_,
+ struct in_addr *address, struct in_addr *netmask)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+
+ if (!(netdev_dev->cache_valid & VALID_IN4)) {
+ int error;
+
+ error = netdev_linux_get_ipv4(netdev_, &netdev_dev->address,
+ SIOCGIFADDR, "SIOCGIFADDR");
+ if (error) {
+ return error;
+ }
+
+ error = netdev_linux_get_ipv4(netdev_, &netdev_dev->netmask,
+ SIOCGIFNETMASK, "SIOCGIFNETMASK");
+ if (error) {
+ return error;
+ }
+
+ netdev_dev->cache_valid |= VALID_IN4;
+ }
+ *address = netdev_dev->address;
+ *netmask = netdev_dev->netmask;
+ return address->s_addr == INADDR_ANY ? EADDRNOTAVAIL : 0;
+}
+
+static int
+netdev_linux_set_in4(struct netdev *netdev_, struct in_addr address,
+ struct in_addr netmask)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+ int error;
+
+ error = do_set_addr(netdev_, SIOCSIFADDR, "SIOCSIFADDR", address);
+ if (!error) {
+ netdev_dev->cache_valid |= VALID_IN4;
+ netdev_dev->address = address;
+ netdev_dev->netmask = netmask;
+ if (address.s_addr != INADDR_ANY) {
+ error = do_set_addr(netdev_, SIOCSIFNETMASK,
+ "SIOCSIFNETMASK", netmask);
+ }
+ }
+ return error;
+}
+
+static bool
+parse_if_inet6_line(const char *line,
+ struct in6_addr *in6, char ifname[16 + 1])
+{
+ uint8_t *s6 = in6->s6_addr;
+#define X8 "%2"SCNx8
+ return sscanf(line,
+ " "X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8
+ "%*x %*x %*x %*x %16s\n",
+ &s6[0], &s6[1], &s6[2], &s6[3],
+ &s6[4], &s6[5], &s6[6], &s6[7],
+ &s6[8], &s6[9], &s6[10], &s6[11],
+ &s6[12], &s6[13], &s6[14], &s6[15],
+ ifname) == 17;
+}
+
+/* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address (if
+ * 'in6' is non-null) and returns true. Otherwise, returns false. */
+static int
+netdev_linux_get_in6(const struct netdev *netdev_, struct in6_addr *in6)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+ if (!(netdev_dev->cache_valid & VALID_IN6)) {
+ FILE *file;
+ char line[128];
+
+ netdev_dev->in6 = in6addr_any;
+
+ file = fopen("/proc/net/if_inet6", "r");
+ if (file != NULL) {
+ const char *name = netdev_get_name(netdev_);
+ while (fgets(line, sizeof line, file)) {
+ struct in6_addr in6;
+ char ifname[16 + 1];
+ if (parse_if_inet6_line(line, &in6, ifname)
+ && !strcmp(name, ifname))
+ {
+ netdev_dev->in6 = in6;
+ break;
+ }
+ }
+ fclose(file);
+ }
+ netdev_dev->cache_valid |= VALID_IN6;
+ }
+ *in6 = netdev_dev->in6;
+ return 0;
+}
+
+static void
+make_in4_sockaddr(struct sockaddr *sa, struct in_addr addr)
+{
+ struct sockaddr_in sin;
+ memset(&sin, 0, sizeof sin);
+ sin.sin_family = AF_INET;
+ sin.sin_addr = addr;
+ sin.sin_port = 0;
+
+ memset(sa, 0, sizeof *sa);
+ memcpy(sa, &sin, sizeof sin);
+}
+
+static int
+do_set_addr(struct netdev *netdev,
+ int ioctl_nr, const char *ioctl_name, struct in_addr addr)
+{
+ struct ifreq ifr;
+ strncpy(ifr.ifr_name, netdev_get_name(netdev), sizeof ifr.ifr_name);
+ make_in4_sockaddr(&ifr.ifr_addr, addr);
+
+ return netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr, ioctl_nr,
+ ioctl_name);
+}
+
+/* Adds 'router' as a default IP gateway. */
+static int
+netdev_linux_add_router(struct netdev *netdev OVS_UNUSED, struct in_addr router)
+{
+ struct in_addr any = { INADDR_ANY };
+ struct rtentry rt;
+ int error;
+
+ memset(&rt, 0, sizeof rt);
+ make_in4_sockaddr(&rt.rt_dst, any);
+ make_in4_sockaddr(&rt.rt_gateway, router);
+ make_in4_sockaddr(&rt.rt_genmask, any);
+ rt.rt_flags = RTF_UP | RTF_GATEWAY;
+ COVERAGE_INC(netdev_add_router);
+ error = ioctl(af_inet_sock, SIOCADDRT, &rt) < 0 ? errno : 0;
+ if (error) {
+ VLOG_WARN("ioctl(SIOCADDRT): %s", strerror(error));
+ }
+ return error;
+}
+
+static int
+netdev_linux_get_next_hop(const struct in_addr *host, struct in_addr *next_hop,
+ char **netdev_name)
+{
+ static const char fn[] = "/proc/net/route";
+ FILE *stream;
+ char line[256];
+ int ln;
+
+ *netdev_name = NULL;
+ stream = fopen(fn, "r");
+ if (stream == NULL) {
+ VLOG_WARN_RL(&rl, "%s: open failed: %s", fn, strerror(errno));
+ return errno;
+ }
+
+ ln = 0;
+ while (fgets(line, sizeof line, stream)) {
+ if (++ln >= 2) {
+ char iface[17];
+ uint32_t dest, gateway, mask;
+ int refcnt, metric, mtu;
+ unsigned int flags, use, window, irtt;
+
+ if (sscanf(line,
+ "%16s %"SCNx32" %"SCNx32" %04X %d %u %d %"SCNx32
+ " %d %u %u\n",
+ iface, &dest, &gateway, &flags, &refcnt,
+ &use, &metric, &mask, &mtu, &window, &irtt) != 11) {
+
+ VLOG_WARN_RL(&rl, "%s: could not parse line %d: %s",
+ fn, ln, line);
+ continue;
+ }
+ if (!(flags & RTF_UP)) {
+ /* Skip routes that aren't up. */
+ continue;
+ }
+
+ /* The output of 'dest', 'mask', and 'gateway' were given in
+ * network byte order, so we don't need need any endian
+ * conversions here. */
+ if ((dest & mask) == (host->s_addr & mask)) {
+ if (!gateway) {
+ /* The host is directly reachable. */
+ next_hop->s_addr = 0;
+ } else {
+ /* To reach the host, we must go through a gateway. */
+ next_hop->s_addr = gateway;
+ }
+ *netdev_name = xstrdup(iface);
+ fclose(stream);
+ return 0;
+ }
+ }
+ }
+
+ fclose(stream);
+ return ENXIO;
+}
+
+/* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
+ * successfully retrieved, it stores the corresponding MAC address in 'mac' and
+ * returns 0. Otherwise, it returns a positive errno value; in particular,
+ * ENXIO indicates that there is not ARP table entry for 'ip' on 'netdev'. */
+static int
+netdev_linux_arp_lookup(const struct netdev *netdev,
+ uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
+{
+ struct arpreq r;
+ struct sockaddr_in sin;
+ int retval;
+
+ memset(&r, 0, sizeof r);
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = ip;
+ sin.sin_port = 0;
+ memcpy(&r.arp_pa, &sin, sizeof sin);
+ r.arp_ha.sa_family = ARPHRD_ETHER;
+ r.arp_flags = 0;
+ strncpy(r.arp_dev, netdev_get_name(netdev), sizeof r.arp_dev);
+ COVERAGE_INC(netdev_arp_lookup);
+ retval = ioctl(af_inet_sock, SIOCGARP, &r) < 0 ? errno : 0;
+ if (!retval) {
+ memcpy(mac, r.arp_ha.sa_data, ETH_ADDR_LEN);
+ } else if (retval != ENXIO) {
+ VLOG_WARN_RL(&rl, "%s: could not look up ARP entry for "IP_FMT": %s",
+ netdev_get_name(netdev), IP_ARGS(&ip), strerror(retval));
+ }
+ return retval;
+}
+
+static int
+nd_to_iff_flags(enum netdev_flags nd)
+{
+ int iff = 0;
+ if (nd & NETDEV_UP) {
+ iff |= IFF_UP;
+ }
+ if (nd & NETDEV_PROMISC) {
+ iff |= IFF_PROMISC;
+ }
+ return iff;
+}
+
+static int
+iff_to_nd_flags(int iff)
+{
+ enum netdev_flags nd = 0;
+ if (iff & IFF_UP) {
+ nd |= NETDEV_UP;
+ }
+ if (iff & IFF_PROMISC) {
+ nd |= NETDEV_PROMISC;
+ }
+ return nd;
+}
+
+static int
+netdev_linux_update_flags(struct netdev *netdev, enum netdev_flags off,
+ enum netdev_flags on, enum netdev_flags *old_flagsp)
+{
+ int old_flags, new_flags;
+ int error;
+
+ error = get_flags(netdev, &old_flags);
+ if (!error) {
+ *old_flagsp = iff_to_nd_flags(old_flags);
+ new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
+ if (new_flags != old_flags) {
+ error = set_flags(netdev, new_flags);
+ }
+ }
+ return error;
+}
+
+static void
+poll_notify(struct list *list)
+{
+ struct netdev_linux_notifier *notifier;
+ LIST_FOR_EACH (notifier, struct netdev_linux_notifier, node, list) {
+ struct netdev_notifier *n = ¬ifier->notifier;
+ n->cb(n);
+ }
+}
+
+static void
+netdev_linux_poll_cb(const struct rtnetlink_change *change,
+ void *aux OVS_UNUSED)
+{
+ if (change) {
+ struct list *list = shash_find_data(&netdev_linux_notifiers,
+ change->ifname);
+ if (list) {
+ poll_notify(list);
+ }
+ } else {
+ struct shash_node *node;
+ SHASH_FOR_EACH (node, &netdev_linux_notifiers) {
+ poll_notify(node->data);
+ }
+ }
+}
+
+static int
+netdev_linux_poll_add(struct netdev *netdev,
+ void (*cb)(struct netdev_notifier *), void *aux,
+ struct netdev_notifier **notifierp)
+{
+ const char *netdev_name = netdev_get_name(netdev);
+ struct netdev_linux_notifier *notifier;
+ struct list *list;
+
+ if (shash_is_empty(&netdev_linux_notifiers)) {
+ int error = rtnetlink_notifier_register(&netdev_linux_poll_notifier,
+ netdev_linux_poll_cb, NULL);
+ if (error) {
+ return error;
+ }
+ }
+
+ list = shash_find_data(&netdev_linux_notifiers, netdev_name);
+ if (!list) {
+ list = xmalloc(sizeof *list);
+ list_init(list);
+ shash_add(&netdev_linux_notifiers, netdev_name, list);
+ }
+
+ notifier = xmalloc(sizeof *notifier);
+ netdev_notifier_init(¬ifier->notifier, netdev, cb, aux);
+ list_push_back(list, ¬ifier->node);
+ *notifierp = ¬ifier->notifier;
+ return 0;
+}
+
+static void
+netdev_linux_poll_remove(struct netdev_notifier *notifier_)
+{
+ struct netdev_linux_notifier *notifier =
+ CONTAINER_OF(notifier_, struct netdev_linux_notifier, notifier);
+ struct list *list;
+
+ /* Remove 'notifier' from its list. */
+ list = list_remove(¬ifier->node);
+ if (list_is_empty(list)) {
+ /* The list is now empty. Remove it from the hash and free it. */
+ const char *netdev_name = netdev_get_name(notifier->notifier.netdev);
+ shash_delete(&netdev_linux_notifiers,
+ shash_find(&netdev_linux_notifiers, netdev_name));
+ free(list);
+ }
+ free(notifier);
+
+ /* If that was the last notifier, unregister. */
+ if (shash_is_empty(&netdev_linux_notifiers)) {
+ rtnetlink_notifier_unregister(&netdev_linux_poll_notifier);
+ }
+}
+
+const struct netdev_class netdev_linux_class = {
+ "system",
+
+ netdev_linux_init,
+ netdev_linux_run,
+ netdev_linux_wait,
+
+ netdev_linux_create_system,
+ netdev_linux_destroy,
+ NULL, /* reconfigure */
+
+ netdev_linux_open,
+ netdev_linux_close,
+
+ netdev_linux_enumerate,
+
+ netdev_linux_recv,
+ netdev_linux_recv_wait,
+ netdev_linux_drain,
+
+ netdev_linux_send,
+ netdev_linux_send_wait,
+
+ netdev_linux_set_etheraddr,
+ netdev_linux_get_etheraddr,
+ netdev_linux_get_mtu,
+ netdev_linux_get_ifindex,
+ netdev_linux_get_carrier,
+ netdev_linux_get_stats,
+ netdev_linux_set_stats,
+
+ netdev_linux_get_features,
+ netdev_linux_set_advertisements,
+ netdev_linux_get_vlan_vid,
+ netdev_linux_set_policing,
+
+ netdev_linux_get_in4,
+ netdev_linux_set_in4,
+ netdev_linux_get_in6,
+ netdev_linux_add_router,
+ netdev_linux_get_next_hop,
+ netdev_linux_arp_lookup,
+
+ netdev_linux_update_flags,
+
+ netdev_linux_poll_add,
+ netdev_linux_poll_remove,
+};
+
+const struct netdev_class netdev_tap_class = {
+ "tap",
+
+ netdev_linux_init,
+ netdev_linux_run,
+ netdev_linux_wait,
+
+ netdev_linux_create_tap,
+ netdev_linux_destroy,
+ NULL, /* reconfigure */
+
+ netdev_linux_open,
+ netdev_linux_close,
+
+ NULL, /* enumerate */
+
+ netdev_linux_recv,
+ netdev_linux_recv_wait,
+ netdev_linux_drain,
+
+ netdev_linux_send,
+ netdev_linux_send_wait,
+
+ netdev_linux_set_etheraddr,
+ netdev_linux_get_etheraddr,
+ netdev_linux_get_mtu,
+ netdev_linux_get_ifindex,
+ netdev_linux_get_carrier,
+ netdev_linux_get_stats,
+ NULL, /* set_stats */
+
+ netdev_linux_get_features,
+ netdev_linux_set_advertisements,
+ netdev_linux_get_vlan_vid,
+ netdev_linux_set_policing,
+
+ netdev_linux_get_in4,
+ netdev_linux_set_in4,
+ netdev_linux_get_in6,
+ netdev_linux_add_router,
+ netdev_linux_get_next_hop,
+ netdev_linux_arp_lookup,
+
+ netdev_linux_update_flags,
+
+ netdev_linux_poll_add,
+ netdev_linux_poll_remove,
+};
+
+\f
+static int
+get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
+{
+ /* Policy for RTNLGRP_LINK messages.
+ *
+ * There are *many* more fields in these messages, but currently we only
+ * care about these fields. */
+ static const struct nl_policy rtnlgrp_link_policy[] = {
+ [IFLA_IFNAME] = { .type = NL_A_STRING, .optional = false },
+ [IFLA_STATS] = { .type = NL_A_UNSPEC, .optional = true,
+ .min_len = sizeof(struct rtnl_link_stats) },
+ };
+
+ struct nl_sock *rtnl_sock;
+ struct ofpbuf request;
+ struct ofpbuf *reply;
+ struct ifinfomsg *ifi;
+ const struct rtnl_link_stats *rtnl_stats;
+ struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
+ int error;
+
+ error = get_rtnl_sock(&rtnl_sock);
+ if (error) {
+ return error;
+ }
+
+ ofpbuf_init(&request, 0);
+ nl_msg_put_nlmsghdr(&request, rtnl_sock, sizeof *ifi,
+ RTM_GETLINK, NLM_F_REQUEST);
+ ifi = ofpbuf_put_zeros(&request, sizeof *ifi);
+ ifi->ifi_family = PF_UNSPEC;
+ ifi->ifi_index = ifindex;
+ error = nl_sock_transact(rtnl_sock, &request, &reply);
+ ofpbuf_uninit(&request);
+ if (error) {
+ return error;
+ }
+
+ if (!nl_policy_parse(reply, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
+ rtnlgrp_link_policy,
+ attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
+ ofpbuf_delete(reply);
+ return EPROTO;
+ }
+
+ if (!attrs[IFLA_STATS]) {
+ VLOG_WARN_RL(&rl, "RTM_GETLINK reply lacks stats");
+ ofpbuf_delete(reply);
+ return EPROTO;
+ }
+
+ rtnl_stats = nl_attr_get(attrs[IFLA_STATS]);
+ stats->rx_packets = rtnl_stats->rx_packets;
+ stats->tx_packets = rtnl_stats->tx_packets;
+ stats->rx_bytes = rtnl_stats->rx_bytes;
+ stats->tx_bytes = rtnl_stats->tx_bytes;
+ stats->rx_errors = rtnl_stats->rx_errors;
+ stats->tx_errors = rtnl_stats->tx_errors;
+ stats->rx_dropped = rtnl_stats->rx_dropped;
+ stats->tx_dropped = rtnl_stats->tx_dropped;
+ stats->multicast = rtnl_stats->multicast;
+ stats->collisions = rtnl_stats->collisions;
+ stats->rx_length_errors = rtnl_stats->rx_length_errors;
+ stats->rx_over_errors = rtnl_stats->rx_over_errors;
+ stats->rx_crc_errors = rtnl_stats->rx_crc_errors;
+ stats->rx_frame_errors = rtnl_stats->rx_frame_errors;
+ stats->rx_fifo_errors = rtnl_stats->rx_fifo_errors;
+ stats->rx_missed_errors = rtnl_stats->rx_missed_errors;
+ stats->tx_aborted_errors = rtnl_stats->tx_aborted_errors;
+ stats->tx_carrier_errors = rtnl_stats->tx_carrier_errors;
+ stats->tx_fifo_errors = rtnl_stats->tx_fifo_errors;
+ stats->tx_heartbeat_errors = rtnl_stats->tx_heartbeat_errors;
+ stats->tx_window_errors = rtnl_stats->tx_window_errors;
+
+ ofpbuf_delete(reply);
+
+ return 0;
+}
+
+static int
+get_stats_via_proc(const char *netdev_name, struct netdev_stats *stats)
+{
+ static const char fn[] = "/proc/net/dev";
+ char line[1024];
+ FILE *stream;
+ int ln;
+
+ stream = fopen(fn, "r");
+ if (!stream) {
+ VLOG_WARN_RL(&rl, "%s: open failed: %s", fn, strerror(errno));
+ return errno;
+ }
+
+ ln = 0;
+ while (fgets(line, sizeof line, stream)) {
+ if (++ln >= 3) {
+ char devname[16];
+#define X64 "%"SCNu64
+ if (sscanf(line,
+ " %15[^:]:"
+ X64 X64 X64 X64 X64 X64 X64 "%*u"
+ X64 X64 X64 X64 X64 X64 X64 "%*u",
+ devname,
+ &stats->rx_bytes,
+ &stats->rx_packets,
+ &stats->rx_errors,
+ &stats->rx_dropped,
+ &stats->rx_fifo_errors,
+ &stats->rx_frame_errors,
+ &stats->multicast,
+ &stats->tx_bytes,
+ &stats->tx_packets,
+ &stats->tx_errors,
+ &stats->tx_dropped,
+ &stats->tx_fifo_errors,
+ &stats->collisions,
+ &stats->tx_carrier_errors) != 15) {
+ VLOG_WARN_RL(&rl, "%s:%d: parse error", fn, ln);
+ } else if (!strcmp(devname, netdev_name)) {
+ stats->rx_length_errors = UINT64_MAX;
+ stats->rx_over_errors = UINT64_MAX;
+ stats->rx_crc_errors = UINT64_MAX;
+ stats->rx_missed_errors = UINT64_MAX;
+ stats->tx_aborted_errors = UINT64_MAX;
+ stats->tx_heartbeat_errors = UINT64_MAX;
+ stats->tx_window_errors = UINT64_MAX;
+ fclose(stream);
+ return 0;
+ }
+ }
+ }
+ VLOG_WARN_RL(&rl, "%s: no stats for %s", fn, netdev_name);
+ fclose(stream);
+ return ENODEV;
+}
+\f
+static int
+get_flags(const struct netdev *netdev, int *flags)
+{
+ struct ifreq ifr;
+ int error;
+
+ error = netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr, SIOCGIFFLAGS,
+ "SIOCGIFFLAGS");
+ *flags = ifr.ifr_flags;
+ return error;
+}
+
+static int
+set_flags(struct netdev *netdev, int flags)
+{
+ struct ifreq ifr;
+
+ ifr.ifr_flags = flags;
+ return netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr, SIOCSIFFLAGS,
+ "SIOCSIFFLAGS");
+}
+
+static int
+do_get_ifindex(const char *netdev_name)
+{
+ struct ifreq ifr;
+
+ strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
+ COVERAGE_INC(netdev_get_ifindex);
+ if (ioctl(af_inet_sock, SIOCGIFINDEX, &ifr) < 0) {
+ VLOG_WARN_RL(&rl, "ioctl(SIOCGIFINDEX) on %s device failed: %s",
+ netdev_name, strerror(errno));
+ return -errno;
+ }
+ return ifr.ifr_ifindex;
+}
+
+static int
+get_ifindex(const struct netdev *netdev_, int *ifindexp)
+{
+ struct netdev_dev_linux *netdev_dev =
+ netdev_dev_linux_cast(netdev_get_dev(netdev_));
+ *ifindexp = 0;
+ if (!(netdev_dev->cache_valid & VALID_IFINDEX)) {
+ int ifindex = do_get_ifindex(netdev_get_name(netdev_));
+ if (ifindex < 0) {
+ return -ifindex;
+ }
+ netdev_dev->cache_valid |= VALID_IFINDEX;
+ netdev_dev->ifindex = ifindex;
+ }
+ *ifindexp = netdev_dev->ifindex;
+ return 0;
+}
+
+static int
+get_etheraddr(const char *netdev_name, uint8_t ea[ETH_ADDR_LEN])
+{
+ struct ifreq ifr;
+ int hwaddr_family;
+
+ memset(&ifr, 0, sizeof ifr);
+ strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
+ COVERAGE_INC(netdev_get_hwaddr);
+ if (ioctl(af_inet_sock, SIOCGIFHWADDR, &ifr) < 0) {
+ VLOG_ERR("ioctl(SIOCGIFHWADDR) on %s device failed: %s",
+ netdev_name, strerror(errno));
+ return errno;
+ }
+ hwaddr_family = ifr.ifr_hwaddr.sa_family;
+ if (hwaddr_family != AF_UNSPEC && hwaddr_family != ARPHRD_ETHER) {
+ VLOG_WARN("%s device has unknown hardware address family %d",
+ netdev_name, hwaddr_family);
+ }
+ memcpy(ea, ifr.ifr_hwaddr.sa_data, ETH_ADDR_LEN);
+ return 0;
+}
+
+static int
+set_etheraddr(const char *netdev_name, int hwaddr_family,
+ const uint8_t mac[ETH_ADDR_LEN])
+{
+ struct ifreq ifr;
+
+ memset(&ifr, 0, sizeof ifr);
+ strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
+ ifr.ifr_hwaddr.sa_family = hwaddr_family;
+ memcpy(ifr.ifr_hwaddr.sa_data, mac, ETH_ADDR_LEN);
+ COVERAGE_INC(netdev_set_hwaddr);
+ if (ioctl(af_inet_sock, SIOCSIFHWADDR, &ifr) < 0) {
+ VLOG_ERR("ioctl(SIOCSIFHWADDR) on %s device failed: %s",
+ netdev_name, strerror(errno));
+ return errno;
+ }
+ return 0;
+}
+
+static int
+netdev_linux_do_ethtool(const char *name, struct ethtool_cmd *ecmd,
+ int cmd, const char *cmd_name)
+{
+ struct ifreq ifr;
+
+ memset(&ifr, 0, sizeof ifr);
+ strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
+ ifr.ifr_data = (caddr_t) ecmd;
+
+ ecmd->cmd = cmd;
+ COVERAGE_INC(netdev_ethtool);
+ if (ioctl(af_inet_sock, SIOCETHTOOL, &ifr) == 0) {
+ return 0;
+ } else {
+ if (errno != EOPNOTSUPP) {
+ VLOG_WARN_RL(&rl, "ethtool command %s on network device %s "
+ "failed: %s", cmd_name, name, strerror(errno));
+ } else {
+ /* The device doesn't support this operation. That's pretty
+ * common, so there's no point in logging anything. */
+ }
+ return errno;
+ }
+}
+
+static int
+netdev_linux_do_ioctl(const char *name, struct ifreq *ifr, int cmd,
+ const char *cmd_name)
+{
+ strncpy(ifr->ifr_name, name, sizeof ifr->ifr_name);
+ if (ioctl(af_inet_sock, cmd, ifr) == -1) {
+ VLOG_DBG_RL(&rl, "%s: ioctl(%s) failed: %s", name, cmd_name,
+ strerror(errno));
+ return errno;
+ }
+ return 0;
+}
+
+static int
+netdev_linux_get_ipv4(const struct netdev *netdev, struct in_addr *ip,
+ int cmd, const char *cmd_name)
+{
+ struct ifreq ifr;
+ int error;
+
+ ifr.ifr_addr.sa_family = AF_INET;
+ error = netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr, cmd, cmd_name);
+ if (!error) {
+ const struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
+ *ip = sin->sin_addr;
+ }
+ return error;
+}
+
+/* Obtains a Netlink routing socket that is not subscribed to any multicast
+ * groups. Returns 0 if successful, otherwise a positive errno value. Stores
+ * the socket in '*rtnl_sockp' if successful, otherwise a null pointer. */
+static int
+get_rtnl_sock(struct nl_sock **rtnl_sockp)
+{
+ static struct nl_sock *sock;
+ int error;
+
+ if (!sock) {
+ error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0, &sock);
+ if (error) {
+ VLOG_ERR_RL(&rl, "failed to create rtnetlink socket: %s",
+ strerror(error));
+ }
+ } else {
+ error = 0;
+ }
+
+ *rtnl_sockp = sock;
+ return error;
}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff