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libvirt/src/util/virnetdevtap.c
Laine Stump 12207fcfcf conf: make virDomainNetGetActualVlan arg/return val const 
This is needed if we want to call the function when the
virDomainNetDef* we have is a const.

Since virDomainNetGetActualVlan returns a pointer to memory that is
within the virDomainNetDefPtr arg, the returned pointer must also be
made const. This leads to a cascade of other virNetDevVlanPtr's that
must be changed to "const virNetDevVlan *".

Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Cole Robinson <crobinso@redhat.com>
2019-11-25 15:29:46 -05:00

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/*
* Copyright (C) 2007-2014 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "virmacaddr.h"
#include "virnetdevtap.h"
#include "virnetdev.h"
#include "virnetdevbridge.h"
#include "virnetdevmidonet.h"
#include "virnetdevopenvswitch.h"
#include "virerror.h"
#include "virfile.h"
#include "viralloc.h"
#include "virlog.h"
#include "virstring.h"
#include "datatypes.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <fcntl.h>
#ifdef __linux__
# include <linux/if_tun.h> /* IFF_TUN, IFF_NO_PI */
#elif defined(__FreeBSD__)
# include <net/if_mib.h>
# include <sys/sysctl.h>
#endif
#if defined(HAVE_GETIFADDRS) && defined(AF_LINK)
# include <ifaddrs.h>
#endif
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_LOG_INIT("util.netdevtap");
/**
* virNetDevTapGetName:
* @tapfd: a tun/tap file descriptor
* @ifname: a pointer that will receive the interface name
*
* Retrieve the interface name given a file descriptor for a tun/tap
* interface.
*
* Returns 0 if the interface name is successfully queried, -1 otherwise
*/
int
virNetDevTapGetName(int tapfd G_GNUC_UNUSED, char **ifname G_GNUC_UNUSED)
{
#ifdef TUNGETIFF
struct ifreq ifr;
if (ioctl(tapfd, TUNGETIFF, &ifr) < 0) {
virReportSystemError(errno, "%s",
_("Unable to query tap interface name"));
return -1;
}
*ifname = g_strdup(ifr.ifr_name);
return 0;
#else
return -1;
#endif
}
/**
* virNetDevTapGetRealDeviceName:
* @ifname: the interface name
*
* Lookup real interface name (i.e. name of the device entry in /dev),
* because e.g. on FreeBSD if we rename tap device to vnetN its device
* entry still remains unchanged (/dev/tapX), but bhyve needs a name
* that matches /dev entry.
*
* Returns the proper interface name or NULL if no corresponding interface
* found.
*/
char*
virNetDevTapGetRealDeviceName(char *ifname G_GNUC_UNUSED)
{
#ifdef IFDATA_DRIVERNAME
int ifindex = 0;
int name[6];
size_t len = 0;
char *ret = NULL;
if ((ifindex = if_nametoindex(ifname)) == 0) {
virReportSystemError(errno,
_("Unable to get interface index for '%s'"),
ifname);
return NULL;
}
name[0] = CTL_NET;
name[1] = PF_LINK;
name[2] = NETLINK_GENERIC;
name[3] = IFMIB_IFDATA;
name[4] = ifindex;
name[5] = IFDATA_DRIVERNAME;
if (sysctl(name, 6, NULL, &len, 0, 0) < 0) {
virReportSystemError(errno,
_("Unable to get driver name for '%s'"),
ifname);
return NULL;
}
if (VIR_ALLOC_N(ret, len) < 0)
return NULL;
if (sysctl(name, 6, ret, &len, 0, 0) < 0) {
virReportSystemError(errno,
_("Unable to get driver name for '%s'"),
ifname);
VIR_FREE(ret);
return NULL;
}
return ret;
#else
return NULL;
#endif
}
/**
* virNetDevProbeVnetHdr:
* @tapfd: a tun/tap file descriptor
*
* Check whether it is safe to enable the IFF_VNET_HDR flag on the
* tap interface.
*
* Setting IFF_VNET_HDR enables QEMU's virtio_net driver to allow
* guests to pass larger (GSO) packets, with partial checksums, to
* the host. This greatly increases the achievable throughput.
*
* It is only useful to enable this when we're setting up a virtio
* interface. And it is only *safe* to enable it when we know for
* sure that a) qemu has support for IFF_VNET_HDR and b) the running
* kernel implements the TUNGETIFF ioctl(), which qemu needs to query
* the supplied tapfd.
*
* Returns 1 if VnetHdr is supported, 0 if not supported
*/
#ifdef IFF_VNET_HDR
static int
virNetDevProbeVnetHdr(int tapfd)
{
# if defined(IFF_VNET_HDR) && defined(TUNGETFEATURES) && defined(TUNGETIFF)
unsigned int features;
struct ifreq dummy;
if (ioctl(tapfd, TUNGETFEATURES, &features) != 0) {
VIR_INFO("Not enabling IFF_VNET_HDR; "
"TUNGETFEATURES ioctl() not implemented");
return 0;
}
if (!(features & IFF_VNET_HDR)) {
VIR_INFO("Not enabling IFF_VNET_HDR; "
"TUNGETFEATURES ioctl() reports no IFF_VNET_HDR");
return 0;
}
/* The kernel will always return -1 at this point.
* If TUNGETIFF is not implemented then errno == EBADFD.
*/
if (ioctl(tapfd, TUNGETIFF, &dummy) != -1 || errno != EBADFD) {
VIR_INFO("Not enabling IFF_VNET_HDR; "
"TUNGETIFF ioctl() not implemented");
return 0;
}
VIR_INFO("Enabling IFF_VNET_HDR");
return 1;
# else
(void) tapfd;
VIR_INFO("Not enabling IFF_VNET_HDR; disabled at build time");
return 0;
# endif
}
#endif
#ifdef TUNSETIFF
/**
* virNetDevTapCreate:
* @ifname: the interface name
* @tunpath: path to the tun device (if NULL, /dev/net/tun is used)
* @tapfds: array of file descriptors return value for the new tap device
* @tapfdSize: number of file descriptors in @tapfd
* @flags: OR of virNetDevTapCreateFlags. Only one flag is recognized:
*
* VIR_NETDEV_TAP_CREATE_VNET_HDR
* - Enable IFF_VNET_HDR on the tap device
* VIR_NETDEV_TAP_CREATE_PERSIST
* - The device will persist after the file descriptor is closed
*
* Creates a tap interface. The caller must use virNetDevTapDelete to
* remove a persistent TAP device when it is no longer needed. In case
* @tapfdSize is greater than one, multiqueue extension is requested
* from kernel.
*
* Returns 0 in case of success or -1 on failure.
*/
int virNetDevTapCreate(char **ifname,
const char *tunpath,
int *tapfd,
size_t tapfdSize,
unsigned int flags)
{
size_t i;
struct ifreq ifr;
int ret = -1;
int fd;
if (!tunpath)
tunpath = "/dev/net/tun";
memset(&ifr, 0, sizeof(ifr));
for (i = 0; i < tapfdSize; i++) {
if ((fd = open(tunpath, O_RDWR)) < 0) {
virReportSystemError(errno,
_("Unable to open %s, is tun module loaded?"),
tunpath);
goto cleanup;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
/* If tapfdSize is greater than one, request multiqueue */
if (tapfdSize > 1) {
# ifdef IFF_MULTI_QUEUE
ifr.ifr_flags |= IFF_MULTI_QUEUE;
# else
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Multiqueue devices are not supported on this system"));
goto cleanup;
# endif
}
# ifdef IFF_VNET_HDR
if ((flags & VIR_NETDEV_TAP_CREATE_VNET_HDR) &&
virNetDevProbeVnetHdr(fd))
ifr.ifr_flags |= IFF_VNET_HDR;
# endif
if (virStrcpyStatic(ifr.ifr_name, *ifname) < 0) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
*ifname);
goto cleanup;
}
if (ioctl(fd, TUNSETIFF, &ifr) < 0) {
virReportSystemError(errno,
_("Unable to create tap device %s"),
NULLSTR(*ifname));
goto cleanup;
}
if (i == 0) {
/* In case we are looping more than once, set other
* TAPs to have the same name */
VIR_FREE(*ifname);
*ifname = g_strdup(ifr.ifr_name);
}
if ((flags & VIR_NETDEV_TAP_CREATE_PERSIST) &&
ioctl(fd, TUNSETPERSIST, 1) < 0) {
virReportSystemError(errno,
_("Unable to set tap device %s to persistent"),
NULLSTR(*ifname));
goto cleanup;
}
tapfd[i] = fd;
}
ret = 0;
cleanup:
if (ret < 0) {
VIR_FORCE_CLOSE(fd);
while (i--)
VIR_FORCE_CLOSE(tapfd[i]);
}
return ret;
}
int virNetDevTapDelete(const char *ifname,
const char *tunpath)
{
struct ifreq try;
int fd;
int ret = -1;
if (!tunpath)
tunpath = "/dev/net/tun";
if ((fd = open(tunpath, O_RDWR)) < 0) {
virReportSystemError(errno,
_("Unable to open %s, is tun module loaded?"),
tunpath);
return -1;
}
memset(&try, 0, sizeof(struct ifreq));
try.ifr_flags = IFF_TAP|IFF_NO_PI;
if (virStrcpyStatic(try.ifr_name, ifname) < 0) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
ifname);
goto cleanup;
}
if (ioctl(fd, TUNSETIFF, &try) < 0) {
virReportSystemError(errno, "%s",
_("Unable to associate TAP device"));
goto cleanup;
}
if (ioctl(fd, TUNSETPERSIST, 0) < 0) {
virReportSystemError(errno, "%s",
_("Unable to make TAP device non-persistent"));
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#elif defined(SIOCIFCREATE2) && defined(SIOCIFDESTROY) && defined(IF_MAXUNIT)
int virNetDevTapCreate(char **ifname,
const char *tunpath G_GNUC_UNUSED,
int *tapfd,
size_t tapfdSize,
unsigned int flags G_GNUC_UNUSED)
{
int s;
struct ifreq ifr;
int ret = -1;
char *newifname = NULL;
if (tapfdSize > 1) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Multiqueue devices are not supported on this system"));
goto cleanup;
}
/* As FreeBSD determines interface type by name,
* we have to create 'tap' interface first and
* then rename it to 'vnet'
*/
if ((s = virNetDevSetupControl("tap", &ifr)) < 0)
return -1;
if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) {
virReportSystemError(errno, "%s",
_("Unable to create tap device"));
goto cleanup;
}
/* In case we were given exact interface name (e.g. 'vnetN'),
* we just rename to it. If we have format string like
* 'vnet%d', we need to find the first available name that
* matches this pattern
*/
if (strstr(*ifname, "%d") != NULL) {
size_t i;
for (i = 0; i <= IF_MAXUNIT; i++) {
g_autofree char *newname = NULL;
newname = g_strdup_printf(*ifname, i);
if (virNetDevExists(newname) == 0) {
newifname = g_steal_pointer(&newname);
break;
}
}
if (newifname) {
VIR_FREE(*ifname);
*ifname = newifname;
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to generate new name for interface %s"),
ifr.ifr_name);
goto cleanup;
}
}
if (tapfd) {
g_autofree char *dev_path = NULL;
dev_path = g_strdup_printf("/dev/%s", ifr.ifr_name);
if ((*tapfd = open(dev_path, O_RDWR)) < 0) {
virReportSystemError(errno,
_("Unable to open %s"),
dev_path);
goto cleanup;
}
}
if (virNetDevSetName(ifr.ifr_name, *ifname) == -1)
goto cleanup;
ret = 0;
cleanup:
VIR_FORCE_CLOSE(s);
return ret;
}
int virNetDevTapDelete(const char *ifname,
const char *tunpath G_GNUC_UNUSED)
{
int s;
struct ifreq ifr;
int ret = -1;
if ((s = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) {
virReportSystemError(errno,
_("Unable to remove tap device %s"),
ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(s);
return ret;
}
#else
int virNetDevTapCreate(char **ifname G_GNUC_UNUSED,
const char *tunpath G_GNUC_UNUSED,
int *tapfd G_GNUC_UNUSED,
size_t tapfdSize G_GNUC_UNUSED,
unsigned int flags G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to create TAP devices on this platform"));
return -1;
}
int virNetDevTapDelete(const char *ifname G_GNUC_UNUSED,
const char *tunpath G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to delete TAP devices on this platform"));
return -1;
}
#endif
/**
* virNetDevTapAttachBridge:
* @tapname: the tap interface name (or name template)
* @brname: the bridge name
* @macaddr: desired MAC address
* @virtPortProfile: bridge/port specific configuration
* @virtVlan: vlan tag info
* @mtu: requested MTU for port (or 0 for "default")
* @actualMTU: MTU actually set for port (after accounting for bridge's MTU)
*
* This attaches an existing tap device (@tapname) to a bridge
* (@brname).
*
* Returns 0 in case of success or -1 on failure
*/
int
virNetDevTapAttachBridge(const char *tapname,
const char *brname,
const virMacAddr *macaddr,
const unsigned char *vmuuid,
virNetDevVPortProfilePtr virtPortProfile,
const virNetDevVlan *virtVlan,
unsigned int mtu,
unsigned int *actualMTU)
{
/* If an MTU is specified for the new device, set it before
* attaching the device to the bridge, as it may affect the MTU of
* the bridge (in particular if it is the first device attached to
* the bridge, or if it is smaller than the current MTU of the
* bridge). If MTU isn't specified for the new device (i.e. 0),
* we need to set the interface MTU to the current MTU of the
* bridge (to avoid inadvertantly changing the bridge's MTU).
*/
if (mtu > 0) {
if (virNetDevSetMTU(tapname, mtu) < 0)
goto error;
} else {
if (virNetDevSetMTUFromDevice(tapname, brname) < 0)
goto error;
}
if (actualMTU) {
int retMTU = virNetDevGetMTU(tapname);
if (retMTU < 0)
goto error;
*actualMTU = retMTU;
}
if (virtPortProfile) {
if (virtPortProfile->virtPortType == VIR_NETDEV_VPORT_PROFILE_MIDONET) {
if (virNetDevMidonetBindPort(tapname, virtPortProfile) < 0)
goto error;
} else if (virtPortProfile->virtPortType == VIR_NETDEV_VPORT_PROFILE_OPENVSWITCH) {
if (virNetDevOpenvswitchAddPort(brname, tapname, macaddr, vmuuid,
virtPortProfile, virtVlan) < 0)
goto error;
}
} else {
if (virNetDevBridgeAddPort(brname, tapname) < 0)
goto error;
}
return 0;
error:
return -1;
}
/**
* virNetDevTapReattachBridge:
* @tapname: the tap interface name (or name template)
* @brname: the bridge name
* @macaddr: desired MAC address
* @virtPortProfile: bridge/port specific configuration
* @virtVlan: vlan tag info
* @mtu: requested MTU for port (or 0 for "default")
* @actualMTU: MTU actually set for port (after accounting for bridge's MTU)
*
* Ensures that the tap device (@tapname) is connected to the bridge
* (@brname), potentially removing it from any existing bridge that
* does not match.
*
* Returns 0 in case of success or -1 on failure
*/
int
virNetDevTapReattachBridge(const char *tapname,
const char *brname,
const virMacAddr *macaddr,
const unsigned char *vmuuid,
virNetDevVPortProfilePtr virtPortProfile,
const virNetDevVlan *virtVlan,
unsigned int mtu,
unsigned int *actualMTU)
{
bool useOVS = false;
g_autofree char *master = NULL;
if (virNetDevGetMaster(tapname, &master) < 0)
return -1;
/* IFLA_MASTER for a tap on an OVS switch is always "ovs-system" */
if (STREQ_NULLABLE(master, "ovs-system")) {
useOVS = true;
if (virNetDevOpenvswitchInterfaceGetMaster(tapname, &master) < 0)
return -1;
}
/* Nothing more todo if we're on the right bridge already */
if (STREQ_NULLABLE(brname, master))
return 0;
/* disconnect from current (incorrect) bridge, if any */
if (master) {
int ret;
VIR_INFO("Removing %s from %s", tapname, master);
if (useOVS)
ret = virNetDevOpenvswitchRemovePort(master, tapname);
else
ret = virNetDevBridgeRemovePort(master, tapname);
if (ret < 0)
return -1;
}
VIR_INFO("Attaching %s to %s", tapname, brname);
if (virNetDevTapAttachBridge(tapname, brname,
macaddr, vmuuid,
virtPortProfile,
virtVlan,
mtu, actualMTU) < 0)
return -1;
return 0;
}
/**
* virNetDevTapCreateInBridgePort:
* @brname: the bridge name
* @ifname: the interface name (or name template)
* @macaddr: desired MAC address
* @tunpath: path to the tun device (if NULL, /dev/net/tun is used)
* @tapfd: array of file descriptor return value for the new tap device
* @tapfdSize: number of file descriptors in @tapfd
* @virtPortProfile: bridge/port specific configuration
* @coalesce: optional coalesce parameters
* @mtu: requested MTU for port (or 0 for "default")
* @actualMTU: MTU actually set for port (after accounting for bridge's MTU)
* @flags: OR of virNetDevTapCreateFlags:
* VIR_NETDEV_TAP_CREATE_IFUP
* - Bring the interface up
* VIR_NETDEV_TAP_CREATE_VNET_HDR
* - Enable IFF_VNET_HDR on the tap device
* VIR_NETDEV_TAP_CREATE_USE_MAC_FOR_BRIDGE
* - Set this interface's MAC as the bridge's MAC address
* VIR_NETDEV_TAP_CREATE_PERSIST
* - The device will persist after the file descriptor is closed
*
* This function creates a new tap device on a bridge. @ifname can be either
* a fixed name or a name template with '%d' for dynamic name allocation.
* in either case the final name for the bridge will be stored in @ifname.
* If the @tapfd parameter is supplied, the open tap device file descriptor
* will be returned, otherwise the TAP device will be closed. The caller must
* use virNetDevTapDelete to remove a persistent TAP device when it is no
* longer needed.
*
* Returns 0 in case of success or -1 on failure
*/
int virNetDevTapCreateInBridgePort(const char *brname,
char **ifname,
const virMacAddr *macaddr,
const unsigned char *vmuuid,
const char *tunpath,
int *tapfd,
size_t tapfdSize,
virNetDevVPortProfilePtr virtPortProfile,
const virNetDevVlan *virtVlan,
virNetDevCoalescePtr coalesce,
unsigned int mtu,
unsigned int *actualMTU,
unsigned int flags)
{
virMacAddr tapmac;
size_t i;
if (virNetDevTapCreate(ifname, tunpath, tapfd, tapfdSize, flags) < 0)
return -1;
/* We need to set the interface MAC before adding it
* to the bridge, because the bridge assumes the lowest
* MAC of all enslaved interfaces & we don't want it
* seeing the kernel allocate random MAC for the TAP
* device before we set our static MAC.
*/
virMacAddrSet(&tapmac, macaddr);
if (!(flags & VIR_NETDEV_TAP_CREATE_USE_MAC_FOR_BRIDGE)) {
/* The tap device's MAC address cannot match the MAC address
* used by the guest. This results in "received packet on
* vnetX with own address as source address" error logs from
* the kernel. Making the tap address as high as possible
* discourages the bridge from using this tap's MAC as its own
* (a Linux host bridge will take on the lowest numbered MAC
* of all devices attached to it).
*/
if (tapmac.addr[0] == 0xFE)
tapmac.addr[0] = 0xFA;
else
tapmac.addr[0] = 0xFE;
}
if (virNetDevSetMAC(*ifname, &tapmac) < 0)
goto error;
if (virNetDevTapAttachBridge(*ifname, brname, macaddr, vmuuid,
virtPortProfile, virtVlan, mtu, actualMTU) < 0) {
goto error;
}
if (virNetDevSetOnline(*ifname, !!(flags & VIR_NETDEV_TAP_CREATE_IFUP)) < 0)
goto error;
if (virNetDevSetCoalesce(*ifname, coalesce, false) < 0)
goto error;
return 0;
error:
for (i = 0; i < tapfdSize && tapfd[i] >= 0; i++)
VIR_FORCE_CLOSE(tapfd[i]);
return -1;
}
/*-------------------- interface stats --------------------*/
/**
* virNetDevTapInterfaceStats:
* @ifname: interface
* @stats: where to store statistics
* @swapped: whether to swap RX/TX fields
*
* Fetch RX/TX statistics for given named interface (@ifname) and
* store them at @stats. The returned statistics are always from
* domain POV. Because in some cases this means swapping RX/TX in
* the stats and in others this means no swapping (consider TAP
* vs macvtap) caller might choose if the returned stats should
* be @swapped or not.
*
* Returns 0 on success, -1 otherwise (with error reported).
*/
#ifdef __linux__
int
virNetDevTapInterfaceStats(const char *ifname,
virDomainInterfaceStatsPtr stats,
bool swapped)
{
int ifname_len;
FILE *fp;
char line[256], *colon;
if (!ifname) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Interface name not provided"));
return -1;
}
fp = fopen("/proc/net/dev", "r");
if (!fp) {
virReportSystemError(errno, "%s",
_("Could not open /proc/net/dev"));
return -1;
}
ifname_len = strlen(ifname);
while (fgets(line, sizeof(line), fp)) {
long long dummy;
long long rx_bytes;
long long rx_packets;
long long rx_errs;
long long rx_drop;
long long tx_bytes;
long long tx_packets;
long long tx_errs;
long long tx_drop;
/* The line looks like:
* " eth0:..."
* Split it at the colon.
*/
colon = strchr(line, ':');
if (!colon) continue;
*colon = '\0';
if (colon-ifname_len >= line &&
STREQ(colon-ifname_len, ifname)) {
if (sscanf(colon+1,
"%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld",
&rx_bytes, &rx_packets, &rx_errs, &rx_drop,
&dummy, &dummy, &dummy, &dummy,
&tx_bytes, &tx_packets, &tx_errs, &tx_drop,
&dummy, &dummy, &dummy, &dummy) != 16)
continue;
if (swapped) {
stats->rx_bytes = tx_bytes;
stats->rx_packets = tx_packets;
stats->rx_errs = tx_errs;
stats->rx_drop = tx_drop;
stats->tx_bytes = rx_bytes;
stats->tx_packets = rx_packets;
stats->tx_errs = rx_errs;
stats->tx_drop = rx_drop;
} else {
stats->rx_bytes = rx_bytes;
stats->rx_packets = rx_packets;
stats->rx_errs = rx_errs;
stats->rx_drop = rx_drop;
stats->tx_bytes = tx_bytes;
stats->tx_packets = tx_packets;
stats->tx_errs = tx_errs;
stats->tx_drop = tx_drop;
}
VIR_FORCE_FCLOSE(fp);
return 0;
}
}
VIR_FORCE_FCLOSE(fp);
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("/proc/net/dev: Interface not found"));
return -1;
}
#elif defined(HAVE_GETIFADDRS) && defined(AF_LINK)
int
virNetDevTapInterfaceStats(const char *ifname,
virDomainInterfaceStatsPtr stats,
bool swapped)
{
struct ifaddrs *ifap, *ifa;
struct if_data *ifd;
int ret = -1;
if (!ifname) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Interface name not provided"));
return -1;
}
if (getifaddrs(&ifap) < 0) {
virReportSystemError(errno, "%s",
_("Could not get interface list"));
return -1;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr)
continue;
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
if (STREQ(ifa->ifa_name, ifname)) {
ifd = (struct if_data *)ifa->ifa_data;
if (swapped) {
stats->tx_bytes = ifd->ifi_ibytes;
stats->tx_packets = ifd->ifi_ipackets;
stats->tx_errs = ifd->ifi_ierrors;
stats->tx_drop = ifd->ifi_iqdrops;
stats->rx_bytes = ifd->ifi_obytes;
stats->rx_packets = ifd->ifi_opackets;
stats->rx_errs = ifd->ifi_oerrors;
# ifdef HAVE_STRUCT_IF_DATA_IFI_OQDROPS
stats->rx_drop = ifd->ifi_oqdrops;
# else
stats->rx_drop = 0;
# endif
} else {
stats->tx_bytes = ifd->ifi_obytes;
stats->tx_packets = ifd->ifi_opackets;
stats->tx_errs = ifd->ifi_oerrors;
# ifdef HAVE_STRUCT_IF_DATA_IFI_OQDROPS
stats->tx_drop = ifd->ifi_oqdrops;
# else
stats->tx_drop = 0;
# endif
stats->rx_bytes = ifd->ifi_ibytes;
stats->rx_packets = ifd->ifi_ipackets;
stats->rx_errs = ifd->ifi_ierrors;
stats->rx_drop = ifd->ifi_iqdrops;
}
ret = 0;
break;
}
}
if (ret < 0)
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Interface not found"));
freeifaddrs(ifap);
return ret;
}
#else
int
virNetDevTapInterfaceStats(const char *ifname G_GNUC_UNUSED,
virDomainInterfaceStatsPtr stats G_GNUC_UNUSED,
bool swapped G_GNUC_UNUSED)
{
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("interface stats not implemented on this platform"));
return -1;
}
#endif /* __linux__ */
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