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Import from old repository commit 61ef2b42a9c4ba8e1600f15bb0236765edc2ad45.
2009-07-08 13:19:16 -07:00
/*
* Copyright (c) 2008, 2009 Nicira Networks.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include "netdev.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <inttypes.h>
#include <linux/if_tun.h>
#include <linux/types.h>
#include <linux/ethtool.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 <net/if_arp.h>
#include <net/if_packet.h>
#include <net/route.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "coverage.h"
#include "dynamic-string.h"
#include "fatal-signal.h"
#include "list.h"
#include "netlink.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
#include "packets.h"
#include "poll-loop.h"
#include "socket-util.h"
#include "svec.h"
/* linux/if.h defines IFF_LOWER_UP, net/if.h doesn't.
* net/if.h defines if_nameindex(), linux/if.h doesn't.
* We can't include both headers, so define IFF_LOWER_UP ourselves. */
#ifndef IFF_LOWER_UP
#define IFF_LOWER_UP 0x10000
#endif
/* 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
#define THIS_MODULE VLM_netdev
#include "vlog.h"
struct netdev {
struct list node;
char *name;
/* File descriptors. For ordinary network devices, the two fds below are
* the same; for tap devices, they differ. */
int netdev_fd; /* Network device. */
int tap_fd; /* TAP character device, if any, otherwise the
* network device. */
/* Cached network device information. */
int ifindex; /* -1 if not known. */
uint8_t etheraddr[ETH_ADDR_LEN];
struct in6_addr in6;
int speed;
int mtu;
int txqlen;
int hwaddr_family;
int save_flags; /* Initial device flags. */
int changed_flags; /* Flags that we changed. */
};
/* Policy for RTNLGRP_LINK messages.
*
* There are *many* more fields in these messages, but currently we only care
* about interface names. */
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) },
};
/* All open network devices. */
static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
/* An AF_INET socket (used for ioctl operations). */
static int af_inet_sock = -1;
/* NETLINK_ROUTE socket. */
static struct nl_sock *rtnl_sock;
/* 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 use_netlink_stats;
/* 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 void init_netdev(void);
static int do_open_netdev(const char *name, int ethertype, int tap_fd,
struct netdev **netdev_);
static int restore_flags(struct netdev *netdev);
static int get_flags(const char *netdev_name, int *flagsp);
static int set_flags(const char *netdev_name, int flags);
static int do_get_ifindex(const char *netdev_name);
static int get_ifindex(const struct netdev *, int *ifindexp);
static int get_etheraddr(const char *netdev_name, uint8_t ea[ETH_ADDR_LEN],
int *hwaddr_familyp);
static int set_etheraddr(const char *netdev_name, int hwaddr_family,
const uint8_t[ETH_ADDR_LEN]);
/* Obtains the IPv6 address for 'name' into 'in6'. */
static void
get_ipv6_address(const char *name, struct in6_addr *in6)
{
FILE *file;
char line[128];
file = fopen("/proc/net/if_inet6", "r");
if (file == NULL) {
/* This most likely indicates that the host doesn't have IPv6 support,
* so it's not really a failure condition.*/
*in6 = in6addr_any;
return;
}
while (fgets(line, sizeof line, file)) {
uint8_t *s6 = in6->s6_addr;
char ifname[16 + 1];
#define X8 "%2"SCNx8
if (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
&& !strcmp(name, ifname))
{
fclose(file);
return;
}
}
*in6 = in6addr_any;
fclose(file);
}
static int
do_ethtool(struct netdev *netdev, struct ethtool_cmd *ecmd,
int cmd, const char *cmd_name)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof ifr);
strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
ifr.ifr_data = (caddr_t) ecmd;
ecmd->cmd = cmd;
COVERAGE_INC(netdev_ethtool);
if (ioctl(netdev->netdev_fd, SIOCETHTOOL, &ifr) == 0) {
return 0;
} else {
if (errno != EOPNOTSUPP) {
VLOG_WARN_RL(&rl, "ethtool command %s on network device %s "
"failed: %s", cmd_name, netdev->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
do_get_features(struct netdev *netdev,
uint32_t *current, uint32_t *advertised,
uint32_t *supported, uint32_t *peer)
{
struct ethtool_cmd ecmd;
int error;
*current = 0;
*supported = 0;
*advertised = 0;
*peer = 0;
memset(&ecmd, 0, sizeof ecmd);
error = do_ethtool(netdev, &ecmd, ETHTOOL_GSET, "ETHTOOL_GSET");
if (error) {
return error;
}
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;
}
/* Set the advertised features */
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;
}
/* Set the current features */
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;
}
if (ecmd.port == PORT_TP) {
*current |= OFPPF_COPPER;
}
else if (ecmd.port == PORT_FIBRE) {
*current |= OFPPF_FIBER;
}
if (ecmd.autoneg) {
*current |= OFPPF_AUTONEG;
}
return 0;
}
/* Opens the network device named 'name' (e.g. "eth0") and returns zero if
* successful, otherwise a positive errno value. On success, sets '*netdevp'
* to the new network device, otherwise to null.
*
* 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
* capture frames of that type received on the device. It may also be one of
* the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
* categories. */
int
netdev_open(const char *name, int ethertype, struct netdev **netdevp)
{
if (!strncmp(name, "tap:", 4)) {
return netdev_open_tap(name + 4, netdevp);
} else {
return do_open_netdev(name, ethertype, -1, netdevp);
}
}
/* Opens a TAP virtual network device. If 'name' is a nonnull, non-empty
* string, attempts to assign that name to the TAP device (failing if the name
* is already in use); otherwise, a name is automatically assigned. Returns
* zero if successful, otherwise a positive errno value. On success, sets
* '*netdevp' to the new network device, otherwise to null. */
int
netdev_open_tap(const char *name, struct netdev **netdevp)
{
static const char tap_dev[] = "/dev/net/tun";
struct ifreq ifr;
int error;
int tap_fd;
tap_fd = open(tap_dev, O_RDWR);
if (tap_fd < 0) {
ovs_error(errno, "opening \"%s\" failed", tap_dev);
return errno;
}
memset(&ifr, 0, sizeof ifr);
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (name) {
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
}
if (ioctl(tap_fd, TUNSETIFF, &ifr) < 0) {
int error = errno;
ovs_error(error, "ioctl(TUNSETIFF) on \"%s\" failed", tap_dev);
close(tap_fd);
return error;
}
error = set_nonblocking(tap_fd);
if (error) {
ovs_error(error, "set_nonblocking on \"%s\" failed", tap_dev);
close(tap_fd);
return error;
}
error = do_open_netdev(ifr.ifr_name, NETDEV_ETH_TYPE_NONE, tap_fd,
netdevp);
if (error) {
close(tap_fd);
}
return error;
}
static int
do_open_netdev(const char *name, int ethertype, int tap_fd,
struct netdev **netdev_)
{
int netdev_fd;
struct sockaddr_ll sll;
struct ifreq ifr;
int ifindex = -1;
uint8_t etheraddr[ETH_ADDR_LEN];
struct in6_addr in6;
int mtu;
int txqlen;
int hwaddr_family;
int error;
struct netdev *netdev;
init_netdev();
*netdev_ = NULL;
COVERAGE_INC(netdev_open);
/* Create raw socket. */
netdev_fd = socket(PF_PACKET, SOCK_RAW,
htons(ethertype == NETDEV_ETH_TYPE_NONE ? 0
: ethertype == NETDEV_ETH_TYPE_ANY ? ETH_P_ALL
: ethertype == NETDEV_ETH_TYPE_802_2 ? ETH_P_802_2
: ethertype));
if (netdev_fd < 0) {
return errno;
}
if (ethertype != NETDEV_ETH_TYPE_NONE) {
/* Set non-blocking mode. */
error = set_nonblocking(netdev_fd);
if (error) {
goto error_already_set;
}
/* Get ethernet device index. */
ifindex = do_get_ifindex(name);
if (ifindex < 0) {
return -ifindex;
}
/* 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) {
VLOG_ERR("bind to %s failed: %s", name, strerror(errno));
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_already_set;
}
}
/* Get MAC address. */
error = get_etheraddr(name, etheraddr, &hwaddr_family);
if (error) {
goto error_already_set;
}
/* Get MTU. */
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
if (ioctl(netdev_fd, SIOCGIFMTU, &ifr) < 0) {
VLOG_ERR("ioctl(SIOCGIFMTU) on %s device failed: %s",
name, strerror(errno));
goto error;
}
mtu = ifr.ifr_mtu;
/* Get TX queue length. */
if (ioctl(netdev_fd, SIOCGIFTXQLEN, &ifr) < 0) {
VLOG_ERR("ioctl(SIOCGIFTXQLEN) on %s device failed: %s",
name, strerror(errno));
goto error;
}
txqlen = ifr.ifr_qlen;
get_ipv6_address(name, &in6);
/* Allocate network device. */
netdev = xmalloc(sizeof *netdev);
netdev->name = xstrdup(name);
netdev->ifindex = ifindex;
netdev->txqlen = txqlen;
netdev->hwaddr_family = hwaddr_family;
netdev->netdev_fd = netdev_fd;
netdev->tap_fd = tap_fd < 0 ? netdev_fd : tap_fd;
memcpy(netdev->etheraddr, etheraddr, sizeof etheraddr);
netdev->mtu = mtu;
netdev->in6 = in6;
/* Save flags to restore at close or exit. */
error = get_flags(netdev->name, &netdev->save_flags);
if (error) {
goto error_already_set;
}
netdev->changed_flags = 0;
fatal_signal_block();
list_push_back(&netdev_list, &netdev->node);
fatal_signal_unblock();
/* Success! */
*netdev_ = netdev;
return 0;
error:
error = errno;
error_already_set:
close(netdev_fd);
if (tap_fd >= 0) {
close(tap_fd);
}
return error;
}
/* Closes and destroys 'netdev'. */
void
netdev_close(struct netdev *netdev)
{
if (netdev) {
/* Bring down interface and drop promiscuous mode, if we brought up
* the interface or enabled promiscuous mode. */
int error;
fatal_signal_block();
error = restore_flags(netdev);
list_remove(&netdev->node);
fatal_signal_unblock();
if (error) {
VLOG_WARN("failed to restore network device flags on %s: %s",
netdev->name, strerror(error));
}
/* Free. */
free(netdev->name);
close(netdev->netdev_fd);
if (netdev->netdev_fd != netdev->tap_fd) {
close(netdev->tap_fd);
}
free(netdev);
}
}
/* Pads 'buffer' out with zero-bytes to the minimum valid length of an
* Ethernet packet, if necessary. */
static void
pad_to_minimum_length(struct ofpbuf *buffer)
{
if (buffer->size < ETH_TOTAL_MIN) {
ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
}
}
/* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
* must have initialized with sufficient room for the packet. The space
* required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
* bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
* (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
* need not be included.)
*
* If a packet is successfully retrieved, returns 0. In this case 'buffer' is
* guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
* positive errno value. Returns EAGAIN immediately if no packet is ready to
* be returned.
*/
int
netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
{
ssize_t n_bytes;
assert(buffer->size == 0);
assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
do {
n_bytes = read(netdev->tap_fd,
ofpbuf_tail(buffer), ofpbuf_tailroom(buffer));
} while (n_bytes < 0 && errno == EINTR);
if (n_bytes < 0) {
if (errno != EAGAIN) {
VLOG_WARN_RL(&rl, "error receiving Ethernet packet on %s: %s",
strerror(errno), netdev->name);
}
return errno;
} else {
COVERAGE_INC(netdev_received);
buffer->size += n_bytes;
/* When the kernel internally sends out an Ethernet frame on an
* interface, it gives us a copy *before* padding the frame to the
* minimum length. Thus, when it sends out something like an ARP
* request, we see a too-short frame. So pad it out to the minimum
* length. */
pad_to_minimum_length(buffer);
return 0;
}
}
/* 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'. */
void
netdev_recv_wait(struct netdev *netdev)
{
poll_fd_wait(netdev->tap_fd, POLLIN);
}
/* Discards all packets waiting to be received from 'netdev'. */
int
netdev_drain(struct netdev *netdev)
{
if (netdev->tap_fd != netdev->netdev_fd) {
drain_fd(netdev->tap_fd, netdev->txqlen);
return 0;
} else {
return drain_rcvbuf(netdev->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. */
int
netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
{
ssize_t n_bytes;
do {
n_bytes = write(netdev->tap_fd, buffer->data, buffer->size);
} while (n_bytes < 0 && errno == EINTR);
if (n_bytes < 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 != EAGAIN) {
VLOG_WARN_RL(&rl, "error sending Ethernet packet on %s: %s",
netdev->name, strerror(errno));
}
return errno;
} else if (n_bytes != buffer->size) {
VLOG_WARN_RL(&rl,
"send partial Ethernet packet (%d bytes of %zu) on %s",
(int) n_bytes, buffer->size, netdev->name);
return EMSGSIZE;
} else {
COVERAGE_INC(netdev_sent);
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. */
void
netdev_send_wait(struct netdev *netdev)
{
if (netdev->tap_fd == netdev->netdev_fd) {
poll_fd_wait(netdev->tap_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. */
int
netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
{
int error = set_etheraddr(netdev->name, netdev->hwaddr_family, mac);
if (!error) {
memcpy(netdev->etheraddr, mac, ETH_ADDR_LEN);
}
return error;
}
int
netdev_nodev_set_etheraddr(const char *name, const uint8_t mac[ETH_ADDR_LEN])
{
init_netdev();
return set_etheraddr(name, ARPHRD_ETHER, mac);
}
/* Returns a pointer to 'netdev''s MAC address. The caller must not modify or
* free the returned buffer. */
const uint8_t *
netdev_get_etheraddr(const struct netdev *netdev)
{
return netdev->etheraddr;
}
/* Returns the name of the network device that 'netdev' represents,
* e.g. "eth0". The caller must not modify or free the returned string. */
const char *
netdev_get_name(const struct netdev *netdev)
{
return netdev->name;
}
/* 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. */
int
netdev_get_mtu(const struct netdev *netdev)
{
return netdev->mtu;
}
/* 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. On failure, all of the
* passed-in values are set to 0. */
int
netdev_get_features(struct netdev *netdev,
uint32_t *current, uint32_t *advertised,
uint32_t *supported, uint32_t *peer)
{
uint32_t dummy[4];
return do_get_features(netdev,
current ? current : &dummy[0],
advertised ? advertised : &dummy[1],
supported ? supported : &dummy[2],
peer ? peer : &dummy[3]);
}
int
netdev_set_advertisements(struct netdev *netdev, uint32_t advertise)
{
struct ethtool_cmd ecmd;
int error;
memset(&ecmd, 0, sizeof ecmd);
error = do_ethtool(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 do_ethtool(netdev, &ecmd, ETHTOOL_SSET, "ETHTOOL_SSET");
}
/* If 'netdev' has an assigned IPv4 address, sets '*in4' to that address (if
* 'in4' is non-null) and returns true. Otherwise, returns false. */
bool
netdev_get_in4(const struct netdev *netdev, struct in_addr *in4)
{
struct ifreq ifr;
struct in_addr ip = { INADDR_ANY };
strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
ifr.ifr_addr.sa_family = AF_INET;
COVERAGE_INC(netdev_get_in4);
if (ioctl(af_inet_sock, SIOCGIFADDR, &ifr) == 0) {
struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
ip = sin->sin_addr;
} else {
VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFADDR) failed: %s",
netdev->name, strerror(errno));
}
if (in4) {
*in4 = ip;
}
return ip.s_addr != INADDR_ANY;
}
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 sock,
int ioctl_nr, const char *ioctl_name, struct in_addr addr)
{
struct ifreq ifr;
int error;
strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
make_in4_sockaddr(&ifr.ifr_addr, addr);
COVERAGE_INC(netdev_set_in4);
error = ioctl(sock, ioctl_nr, &ifr) < 0 ? errno : 0;
if (error) {
VLOG_WARN("ioctl(%s): %s", ioctl_name, strerror(error));
}
return error;
}
/* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
* 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
* positive errno value. */
int
netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
{
int error;
error = do_set_addr(netdev, af_inet_sock,
SIOCSIFADDR, "SIOCSIFADDR", addr);
if (!error && addr.s_addr != INADDR_ANY) {
error = do_set_addr(netdev, af_inet_sock,
SIOCSIFNETMASK, "SIOCSIFNETMASK", mask);
}
return error;
}
/* Adds 'router' as a default IP gateway. */
int
netdev_add_router(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;
}
/* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address (if
* 'in6' is non-null) and returns true. Otherwise, returns false. */
bool
netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
{
if (in6) {
*in6 = netdev->in6;
}
return memcmp(&netdev->in6, &in6addr_any, sizeof netdev->in6) != 0;
}
/* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
* Returns 0 if successful, otherwise a positive errno value. On failure,
* stores 0 into '*flagsp'. */
int
netdev_get_flags(const struct netdev *netdev, enum netdev_flags *flagsp)
{
return netdev_nodev_get_flags(netdev->name, flagsp);
}
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;
}
/* On 'netdev', turns off the flags in 'off' and then turns on the flags in
* 'on'. If 'permanent' is true, the changes will persist; otherwise, they
* will be reverted when 'netdev' is closed or the program exits. Returns 0 if
* successful, otherwise a positive errno value. */
static int
do_update_flags(struct netdev *netdev, enum netdev_flags off,
enum netdev_flags on, bool permanent)
{
int old_flags, new_flags;
int error;
error = get_flags(netdev->name, &old_flags);
if (error) {
return error;
}
new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
if (!permanent) {
netdev->changed_flags |= new_flags ^ old_flags;
}
if (new_flags != old_flags) {
error = set_flags(netdev->name, new_flags);
}
return error;
}
/* Sets the flags for 'netdev' to 'flags'.
* If 'permanent' is true, the changes will persist; otherwise, they
* will be reverted when 'netdev' is closed or the program exits.
* Returns 0 if successful, otherwise a positive errno value. */
int
netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
bool permanent)
{
return do_update_flags(netdev, -1, flags, permanent);
}
/* Turns on the specified 'flags' on 'netdev'.
* If 'permanent' is true, the changes will persist; otherwise, they
* will be reverted when 'netdev' is closed or the program exits.
* Returns 0 if successful, otherwise a positive errno value. */
int
netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
bool permanent)
{
return do_update_flags(netdev, 0, flags, permanent);
}
/* Turns off the specified 'flags' on 'netdev'.
* If 'permanent' is true, the changes will persist; otherwise, they
* will be reverted when 'netdev' is closed or the program exits.
* Returns 0 if successful, otherwise a positive errno value. */
int
netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
bool permanent)
{
return do_update_flags(netdev, flags, 0, permanent);
}
/* 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'. */
int
netdev_arp_lookup(const struct netdev *netdev,
uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
{
struct arpreq r;
struct sockaddr_in *pa;
int retval;
memset(&r, 0, sizeof r);
pa = (struct sockaddr_in *) &r.arp_pa;
pa->sin_family = AF_INET;
pa->sin_addr.s_addr = ip;
pa->sin_port = 0;
r.arp_ha.sa_family = ARPHRD_ETHER;
r.arp_flags = 0;
strncpy(r.arp_dev, netdev->name, 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->name, IP_ARGS(&ip), strerror(retval));
}
return retval;
}
static int
get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
{
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;
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");
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;
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;
}
int
netdev_get_carrier(const struct netdev *netdev, bool *carrier)
{
char line[8];
int retval;
int error;
char *fn;
int fd;
*carrier = false;
fn = xasprintf("/sys/class/net/%s/carrier", netdev->name);
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, "%s: read failed: %s", fn, strerror(error));
}
goto exit_close;
} else if (retval == 0) {
error = EPROTO;
VLOG_WARN_RL(&rl, "%s: unexpected end of file", fn);
goto exit_close;
}
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_close;
}
*carrier = line[0] != '0';
error = 0;
exit_close:
close(fd);
exit:
free(fn);
return error;
}
int
netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
{
int error;
COVERAGE_INC(netdev_get_stats);
if (use_netlink_stats) {
int ifindex;
error = get_ifindex(netdev, &ifindex);
if (!error) {
error = get_stats_via_netlink(ifindex, stats);
}
} else {
error = get_stats_via_proc(netdev->name, stats);
}
if (error) {
memset(stats, 0xff, sizeof *stats);
}
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"
/* We redirect stderr to /dev/null because we often want to remove all
* traffic control configuration on a port so its in a known state. If
* this done when there is no such configuration, tc complains, so we just
* always ignore it.
*/
#define POLICE_DEL_CMD "/sbin/tc qdisc del dev %s handle ffff: ingress 2>/dev/null"
/* Attempts to set input rate limiting (policing) policy. */
int
netdev_nodev_set_policing(const char *netdev_name, uint32_t kbits_rate,
uint32_t kbits_burst)
{
char command[1024];
init_netdev();
COVERAGE_INC(netdev_set_policing);
if (kbits_rate) {
if (!kbits_burst) {
/* Default to 10 kilobits if not specified. */
kbits_burst = 10;
}
/* xxx This should be more careful about only adding if it
* xxx actually exists, as opposed to always deleting it. */
snprintf(command, sizeof(command), POLICE_DEL_CMD, netdev_name);
if (system(command) == -1) {
VLOG_WARN_RL(&rl, "%s: problem removing policing", netdev_name);
}
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;
}
} else {
snprintf(command, sizeof(command), POLICE_DEL_CMD, netdev_name);
if (system(command) == -1) {
VLOG_WARN_RL(&rl, "%s: problem removing policing", netdev_name);
}
}
return 0;
}
int
netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
uint32_t kbits_burst)
{
return netdev_nodev_set_policing(netdev->name, kbits_rate, kbits_burst);
}
/* Initializes 'svec' with a list of the names of all known network devices. */
void
netdev_enumerate(struct svec *svec)
{
struct if_nameindex *names;
svec_init(svec);
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);
} else {
VLOG_WARN("could not obtain list of network device names: %s",
strerror(errno));
}
}
/* Obtains the current flags for the network device named 'netdev_name' and
* stores them into '*flagsp'. Returns 0 if successful, otherwise a positive
* errno value. On error, stores 0 into '*flagsp'.
*
* If only device flags are needed, this is more efficient than calling
* netdev_open(), netdev_get_flags(), netdev_close(). */
int
netdev_nodev_get_flags(const char *netdev_name, enum netdev_flags *flagsp)
{
int error, flags;
init_netdev();
*flagsp = 0;
error = get_flags(netdev_name, &flags);
if (error) {
return error;
}
if (flags & IFF_UP) {
*flagsp |= NETDEV_UP;
}
if (flags & IFF_PROMISC) {
*flagsp |= NETDEV_PROMISC;
}
return 0;
}
int
netdev_nodev_get_etheraddr(const char *netdev_name, uint8_t mac[6])
{
init_netdev();
return get_etheraddr(netdev_name, mac, NULL);
}
/* 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. */
int
netdev_get_vlan_vid(const char *netdev_name, int *vlan_vid)
{
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;
}
static void restore_all_flags(void *aux);
/* Set up a signal hook to restore network device flags on program
* termination. */
static void
init_netdev(void)
{
static bool inited;
if (!inited) {
int ifindex;
int error;
inited = true;
fatal_signal_add_hook(restore_all_flags, NULL, true);
af_inet_sock = socket(AF_INET, SOCK_DGRAM, 0);
if (af_inet_sock < 0) {
ovs_fatal(errno, "socket(AF_INET)");
}
error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0, &rtnl_sock);
if (error) {
ovs_fatal(error, "socket(AF_NETLINK, NETLINK_ROUTE)");
}
/* Decide on the netdev_get_stats() implementation to use. Netlink is
* preferable, so if that works, we'll use it. */
ifindex = do_get_ifindex("lo");
if (ifindex < 0) {
VLOG_WARN("failed to get ifindex for lo, "
"obtaining netdev stats from proc");
use_netlink_stats = false;
} else {
struct netdev_stats stats;
error = get_stats_via_netlink(ifindex, &stats);
if (!error) {
VLOG_DBG("obtaining netdev stats via rtnetlink");
use_netlink_stats = 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));
use_netlink_stats = false;
}
}
}
}
/* Restore the network device flags on 'netdev' to those that were active
* before we changed them. Returns 0 if successful, otherwise a positive
* errno value.
*
* To avoid reentry, the caller must ensure that fatal signals are blocked. */
static int
restore_flags(struct netdev *netdev)
{
struct ifreq ifr;
int restore_flags;
/* Get current flags. */
strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
COVERAGE_INC(netdev_get_flags);
if (ioctl(netdev->netdev_fd, SIOCGIFFLAGS, &ifr) < 0) {
return errno;
}
/* Restore flags that we might have changed, if necessary. */
restore_flags = netdev->changed_flags & (IFF_PROMISC | IFF_UP);
if ((ifr.ifr_flags ^ netdev->save_flags) & restore_flags) {
ifr.ifr_flags &= ~restore_flags;
ifr.ifr_flags |= netdev->save_flags & restore_flags;
COVERAGE_INC(netdev_set_flags);
if (ioctl(netdev->netdev_fd, SIOCSIFFLAGS, &ifr) < 0) {
return errno;
}
}
return 0;
}
/* Retores all the flags on all network devices that we modified. Called from
* a signal handler, so it does not attempt to report error conditions. */
static void
restore_all_flags(void *aux UNUSED)
{
struct netdev *netdev;
LIST_FOR_EACH (netdev, struct netdev, node, &netdev_list) {
restore_flags(netdev);
}
}
static int
get_flags(const char *netdev_name, int *flags)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
COVERAGE_INC(netdev_get_flags);
if (ioctl(af_inet_sock, SIOCGIFFLAGS, &ifr) < 0) {
VLOG_ERR("ioctl(SIOCGIFFLAGS) on %s device failed: %s",
netdev_name, strerror(errno));
return errno;
}
*flags = ifr.ifr_flags;
return 0;
}
static int
set_flags(const char *netdev_name, int flags)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
ifr.ifr_flags = flags;
COVERAGE_INC(netdev_set_flags);
if (ioctl(af_inet_sock, SIOCSIFFLAGS, &ifr) < 0) {
VLOG_ERR("ioctl(SIOCSIFFLAGS) on %s device failed: %s",
netdev_name, strerror(errno));
return errno;
}
return 0;
}
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)
{
*ifindexp = 0;
if (netdev->ifindex < 0) {
int ifindex = do_get_ifindex(netdev->name);
if (ifindex < 0) {
return -ifindex;
}
((struct netdev *) netdev)->ifindex = ifindex;
}
*ifindexp = netdev->ifindex;
return 0;
}
static int
get_etheraddr(const char *netdev_name, uint8_t ea[ETH_ADDR_LEN],
int *hwaddr_familyp)
{
struct ifreq ifr;
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;
}
if (hwaddr_familyp) {
int hwaddr_family = ifr.ifr_hwaddr.sa_family;
*hwaddr_familyp = hwaddr_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;
}
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