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libvirt/src/util/virnetdevmacvlan.c
Michal Privoznik 95b9db4ee2 lib: Prefer WITH_* prefix for #if conditionals 
Currently, we are mixing: #if HAVE_BLAH with #if WITH_BLAH.
Things got way better with Pavel's work on meson, but apparently,
mixing these two lead to confusing and easy to miss bugs (see
31fb929eca for instance). While we were forced to use HAVE_
prefix with autotools, we are free to chose our own prefix with
meson and since WITH_ prefix appears to be more popular let's use
it everywhere.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
2020-09-02 10:28:10 +02:00

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/*
* Copyright (C) 2010-2017 Red Hat, Inc.
* Copyright (C) 2010-2012 IBM Corporation
*
* 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/>.
*
* Notes:
* netlink: http://lovezutto.googlepages.com/netlink.pdf
* iproute2 package
*
*/
#include <config.h>
#include "virnetdevmacvlan.h"
#include "virmacaddr.h"
#include "virerror.h"
#include "virthread.h"
#include "virstring.h"
#define VIR_FROM_THIS VIR_FROM_NET
VIR_ENUM_IMPL(virNetDevMacVLanMode,
VIR_NETDEV_MACVLAN_MODE_LAST,
"vepa",
"private",
"bridge",
"passthrough",
);
#if WITH_MACVTAP
# include <fcntl.h>
# include <net/if.h>
# include <linux/if_tun.h>
# include <math.h>
/* Older kernels lacked this enum value. */
# if !WITH_DECL_MACVLAN_MODE_PASSTHRU
# define MACVLAN_MODE_PASSTHRU 8
# endif
# include "viralloc.h"
# include "virlog.h"
# include "viruuid.h"
# include "virfile.h"
# include "virnetlink.h"
# include "virnetdev.h"
# include "virpidfile.h"
# include "virbitmap.h"
# include "virsocket.h"
VIR_LOG_INIT("util.netdevmacvlan");
# define VIR_NET_GENERATED_MACVTAP_PATTERN VIR_NET_GENERATED_MACVTAP_PREFIX "%d"
# define VIR_NET_GENERATED_MACVLAN_PATTERN VIR_NET_GENERATED_MACVLAN_PREFIX "%d"
# define VIR_NET_GENERATED_PREFIX \
((flags & VIR_NETDEV_MACVLAN_CREATE_WITH_TAP) ? \
VIR_NET_GENERATED_MACVTAP_PREFIX : VIR_NET_GENERATED_MACVLAN_PREFIX)
virMutex virNetDevMacVLanCreateMutex = VIR_MUTEX_INITIALIZER;
static int virNetDevMacVTapLastID = -1;
static int virNetDevMacVLanLastID = -1;
static void
virNetDevMacVLanReserveNameInternal(const char *name)
{
unsigned int id;
const char *idstr = NULL;
int *lastID = NULL;
int len;
if (STRPREFIX(name, VIR_NET_GENERATED_MACVTAP_PREFIX)) {
lastID = &virNetDevMacVTapLastID;
len = strlen(VIR_NET_GENERATED_MACVTAP_PREFIX);
} else if (STRPREFIX(name, VIR_NET_GENERATED_MACVLAN_PREFIX)) {
lastID = &virNetDevMacVTapLastID;
len = strlen(VIR_NET_GENERATED_MACVLAN_PREFIX);
} else {
return;
}
VIR_INFO("marking device in use: '%s'", name);
idstr = name + len;
if (virStrToLong_ui(idstr, NULL, 10, &id) >= 0) {
if (*lastID < (int)id)
*lastID = id;
}
}
/**
* virNetDevMacVLanReserveName:
* @name: name of an existing macvtap/macvlan device
*
* Set the value of virNetDevMacV(Lan|Tap)LastID to assure that any
* new device created with an autogenerated name will use a number
* higher than the number in the given device name.
*
* Returns nothing.
*/
void
virNetDevMacVLanReserveName(const char *name)
{
virMutexLock(&virNetDevMacVLanCreateMutex);
virNetDevMacVLanReserveNameInternal(name);
virMutexUnlock(&virNetDevMacVLanCreateMutex);
}
/**
* virNetDevMacVLanGenerateName:
* @ifname: pointer to pointer to string containing template
* @lastID: counter to add to the template to form the name
*
* generate a new (currently unused) name for a new macvtap/macvlan
* device based on the template string in @ifname - replace %d with
* ++(*counter), and keep trying new values until one is found
* that doesn't already exist, or we've tried 10000 different
* names. Once a usable name is found, replace the template with the
* actual name.
*
* Returns 0 on success, -1 on failure.
*/
static int
virNetDevMacVLanGenerateName(char **ifname, unsigned int flags)
{
const char *prefix;
const char *iftemplate;
int *lastID;
int id;
double maxIDd;
int maxID = INT_MAX;
int attempts = 0;
if (flags & VIR_NETDEV_MACVLAN_CREATE_WITH_TAP) {
prefix = VIR_NET_GENERATED_MACVTAP_PREFIX;
iftemplate = VIR_NET_GENERATED_MACVTAP_PREFIX "%d";
lastID = &virNetDevMacVTapLastID;
} else {
prefix = VIR_NET_GENERATED_MACVLAN_PREFIX;
iftemplate = VIR_NET_GENERATED_MACVLAN_PREFIX "%d";
lastID = &virNetDevMacVLanLastID;
}
maxIDd = pow(10, IFNAMSIZ - 1 - strlen(prefix));
if (maxIDd <= (double)INT_MAX)
maxID = (int)maxIDd;
do {
g_autofree char *try = NULL;
id = ++(*lastID);
/* reset before overflow */
if (*lastID == maxID)
*lastID = -1;
try = g_strdup_printf(iftemplate, id);
if (!virNetDevExists(try)) {
g_free(*ifname);
*ifname = g_steal_pointer(&try);
return 0;
}
} while (++attempts < 10000);
virReportError(VIR_ERR_INTERNAL_ERROR,
_("no unused %s names available"),
*ifname);
return -1;
}
/**
* virNetDevMacVLanIsMacvtap:
* @ifname: Name of the interface
*
* Return T if the named netdev exists and is a macvtap device
* F in all other cases.
*/
bool
virNetDevMacVLanIsMacvtap(const char *ifname)
{
int ifindex;
g_autofree char *tapname = NULL;
if (virNetDevGetIndex(ifname, &ifindex) < 0)
return false;
tapname = g_strdup_printf("/dev/tap%d", ifindex);
return virFileExists(tapname);
}
/**
* virNetDevMacVLanCreate:
*
* @ifname: The name the interface is supposed to have; optional parameter
* @type: The type of device, i.e., "macvtap", "macvlan"
* @macaddress: The MAC address of the device
* @srcdev: The name of the 'link' device
* @macvlan_mode: The macvlan mode to use
* @retry: Pointer to integer that will be '1' upon return if an interface
* with the same name already exists and it is worth to try
* again with a different name
*
* Create a macvtap device with the given properties.
*
* Returns 0 on success, -1 on fatal error.
*/
int
virNetDevMacVLanCreate(const char *ifname,
const char *type,
const virMacAddr *macaddress,
const char *srcdev,
uint32_t macvlan_mode)
{
int error = 0;
int ifindex = 0;
virNetlinkNewLinkData data = {
.macvlan_mode = &macvlan_mode,
.mac = macaddress,
};
if (virNetDevGetIndex(srcdev, &ifindex) < 0)
return -1;
data.ifindex = &ifindex;
if (virNetlinkNewLink(ifname, type, &data, &error) < 0) {
char macstr[VIR_MAC_STRING_BUFLEN];
virReportSystemError(-error,
_("error creating %s interface %s@%s (%s)"),
type, ifname, srcdev,
virMacAddrFormat(macaddress, macstr));
return -1;
}
VIR_INFO("created device: '%s'", ifname);
return 0;
}
/**
* virNetDevMacVLanDelete:
*
* @ifname: Name of the interface
*
* Tear down an interface with the given name.
*
* Returns 0 on success, -1 on fatal error.
*/
int virNetDevMacVLanDelete(const char *ifname)
{
VIR_INFO("delete device: '%s'", ifname);
return virNetlinkDelLink(ifname, NULL);
}
/**
* virNetDevMacVLanTapOpen:
* @ifname: Name of the macvtap interface
* @tapfd: array of file descriptor return value for the new macvtap device
* @tapfdSize: number of file descriptors in @tapfd
*
* Open the macvtap's tap device, possibly multiple times if @tapfdSize > 1.
*
* Returns 0 on success, -1 otherwise.
*/
int
virNetDevMacVLanTapOpen(const char *ifname,
int *tapfd,
size_t tapfdSize)
{
int retries = 10;
int ret = -1;
int ifindex;
size_t i = 0;
g_autofree char *tapname = NULL;
if (virNetDevGetIndex(ifname, &ifindex) < 0)
return -1;
tapname = g_strdup_printf("/dev/tap%d", ifindex);
for (i = 0; i < tapfdSize; i++) {
int fd = -1;
while (fd < 0) {
if ((fd = open(tapname, O_RDWR)) >= 0) {
tapfd[i] = fd;
} else if (retries-- > 0) {
/* may need to wait for udev to be done */
g_usleep(20000);
} else {
/* However, if haven't succeeded, quit. */
virReportSystemError(errno,
_("cannot open macvtap tap device %s"),
tapname);
goto cleanup;
}
}
}
ret = 0;
cleanup:
if (ret < 0) {
while (i--)
VIR_FORCE_CLOSE(tapfd[i]);
}
return ret;
}
/**
* virNetDevMacVLanTapSetup:
* @tapfd: array of file descriptors of the macvtap tap
* @tapfdSize: number of file descriptors in @tapfd
* @vnet_hdr: whether to enable or disable IFF_VNET_HDR
*
* Turn on the IFF_VNET_HDR flag if requested and available, but make sure
* it's off otherwise. Similarly, turn on IFF_MULTI_QUEUE if @tapfdSize is
* greater than one, but if it can't be set, consider it a fatal error
* (rather than ignoring as with @vnet_hdr).
*
* A fatal error is defined as the VNET_HDR flag being set but it cannot
* be turned off for some reason. This is reported with -1. Other fatal
* error is not being able to read the interface flags. In that case the
* macvtap device should not be used.
*
* Returns 0 on success, -1 in case of fatal error.
*/
int
virNetDevMacVLanTapSetup(int *tapfd, size_t tapfdSize, bool vnet_hdr)
{
unsigned int features;
struct ifreq ifreq;
short new_flags = 0;
size_t i;
for (i = 0; i < tapfdSize; i++) {
memset(&ifreq, 0, sizeof(ifreq));
if (ioctl(tapfd[i], TUNGETIFF, &ifreq) < 0) {
virReportSystemError(errno, "%s",
_("cannot get interface flags on macvtap tap"));
return -1;
}
new_flags = ifreq.ifr_flags;
if (vnet_hdr) {
if (ioctl(tapfd[i], TUNGETFEATURES, &features) < 0) {
virReportSystemError(errno, "%s",
_("cannot get feature flags on macvtap tap"));
return -1;
}
if (features & IFF_VNET_HDR)
new_flags |= IFF_VNET_HDR;
} else {
new_flags &= ~IFF_VNET_HDR;
}
# ifdef IFF_MULTI_QUEUE
if (tapfdSize > 1)
new_flags |= IFF_MULTI_QUEUE;
else
new_flags &= ~IFF_MULTI_QUEUE;
# else
if (tapfdSize > 1) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Multiqueue devices are not supported on this system"));
return -1;
}
# endif
if (new_flags != ifreq.ifr_flags) {
ifreq.ifr_flags = new_flags;
if (ioctl(tapfd[i], TUNSETIFF, &ifreq) < 0) {
virReportSystemError(errno, "%s",
_("unable to set vnet or multiqueue flags on macvtap"));
return -1;
}
}
}
return 0;
}
static const uint32_t modeMap[VIR_NETDEV_MACVLAN_MODE_LAST] = {
[VIR_NETDEV_MACVLAN_MODE_VEPA] = MACVLAN_MODE_VEPA,
[VIR_NETDEV_MACVLAN_MODE_PRIVATE] = MACVLAN_MODE_PRIVATE,
[VIR_NETDEV_MACVLAN_MODE_BRIDGE] = MACVLAN_MODE_BRIDGE,
[VIR_NETDEV_MACVLAN_MODE_PASSTHRU] = MACVLAN_MODE_PASSTHRU,
};
/* Struct to hold the state and configuration of a 802.1qbg port */
struct virNetlinkCallbackData {
char *cr_ifname;
virNetDevVPortProfilePtr virtPortProfile;
virMacAddr macaddress;
char *linkdev;
int vf;
unsigned char vmuuid[VIR_UUID_BUFLEN];
virNetDevVPortProfileOp vmOp;
unsigned int linkState;
};
typedef struct virNetlinkCallbackData *virNetlinkCallbackDataPtr;
# define INSTANCE_STRLEN 36
static int instance2str(const unsigned char *p, char *dst, size_t size)
{
if (dst && size > INSTANCE_STRLEN) {
g_snprintf(dst, size, "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
"%02x%02x-%02x%02x%02x%02x%02x%02x",
p[0], p[1], p[2], p[3],
p[4], p[5], p[6], p[7],
p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
return 0;
}
return -1;
}
# define LLDPAD_PID_FILE "/var/run/lldpad.pid"
# define VIRIP_PID_FILE "/var/run/virip.pid"
/**
* virNetDevMacVLanVPortProfileCallback:
*
* @hdr: The buffer containing the received netlink header + payload
* @length: The length of the received netlink message.
* @peer: The netling sockaddr containing the peer information
* @handled: Contains information if the message has been replied to yet
* @opaque: Contains vital information regarding the associated vm an interface
*
* This function is called when a netlink message is received. The function
* reads the message and responds if it is pertinent to the running VMs
* network interface.
*/
static void
virNetDevMacVLanVPortProfileCallback(struct nlmsghdr *hdr,
unsigned int length,
struct sockaddr_nl *peer,
bool *handled,
void *opaque)
{
struct nla_policy ifla_vf_policy[IFLA_VF_MAX + 1] = {
[IFLA_VF_MAC] = {.minlen = sizeof(struct ifla_vf_mac),
.maxlen = sizeof(struct ifla_vf_mac)},
[IFLA_VF_VLAN] = {.minlen = sizeof(struct ifla_vf_vlan),
.maxlen = sizeof(struct ifla_vf_vlan)},
};
struct nla_policy ifla_port_policy[IFLA_PORT_MAX + 1] = {
[IFLA_PORT_RESPONSE] = {.type = NLA_U16},
};
struct nlattr *tb[IFLA_MAX + 1], *tb3[IFLA_PORT_MAX + 1],
*tb_vfinfo[IFLA_VF_MAX + 1], *tb_vfinfo_list;
struct ifinfomsg ifinfo;
void *data;
int rem;
char *ifname;
bool indicate = false;
virNetlinkCallbackDataPtr calld = opaque;
pid_t lldpad_pid = 0;
pid_t virip_pid = 0;
char macaddr[VIR_MAC_STRING_BUFLEN];
data = nlmsg_data(hdr);
/* Quickly decide if we want this or not */
if (virPidFileReadPath(LLDPAD_PID_FILE, &lldpad_pid) < 0)
return;
ignore_value(virPidFileReadPath(VIRIP_PID_FILE, &virip_pid));
if (hdr->nlmsg_pid != lldpad_pid && hdr->nlmsg_pid != virip_pid)
return; /* we only care for lldpad and virip messages */
if (hdr->nlmsg_type != RTM_SETLINK)
return; /* we only care for RTM_SETLINK */
if (*handled)
return; /* if it has been handled - dont handle again */
/* DEBUG start */
VIR_INFO("netlink message nl_sockaddr: %p len: %d", peer, length);
VIR_DEBUG("nlmsg_type = 0x%02x", hdr->nlmsg_type);
VIR_DEBUG("nlmsg_len = 0x%04x", hdr->nlmsg_len);
VIR_DEBUG("nlmsg_pid = %d", hdr->nlmsg_pid);
VIR_DEBUG("nlmsg_seq = 0x%08x", hdr->nlmsg_seq);
VIR_DEBUG("nlmsg_flags = 0x%04x", hdr->nlmsg_flags);
VIR_DEBUG("lldpad pid = %d", lldpad_pid);
switch (hdr->nlmsg_type) {
case RTM_NEWLINK:
case RTM_DELLINK:
case RTM_SETLINK:
case RTM_GETLINK:
VIR_DEBUG(" IFINFOMSG");
VIR_DEBUG(" ifi_family = 0x%02x",
((struct ifinfomsg *)data)->ifi_family);
VIR_DEBUG(" ifi_type = 0x%x",
((struct ifinfomsg *)data)->ifi_type);
VIR_DEBUG(" ifi_index = %i",
((struct ifinfomsg *)data)->ifi_index);
VIR_DEBUG(" ifi_flags = 0x%04x",
((struct ifinfomsg *)data)->ifi_flags);
VIR_DEBUG(" ifi_change = 0x%04x",
((struct ifinfomsg *)data)->ifi_change);
}
/* DEBUG end */
/* Parse netlink message assume a setlink with vfports */
memcpy(&ifinfo, NLMSG_DATA(hdr), sizeof(ifinfo));
VIR_DEBUG("family:%#x type:%#x index:%d flags:%#x change:%#x",
ifinfo.ifi_family, ifinfo.ifi_type, ifinfo.ifi_index,
ifinfo.ifi_flags, ifinfo.ifi_change);
if (nlmsg_parse(hdr, sizeof(ifinfo),
(struct nlattr **)&tb, IFLA_MAX, NULL)) {
VIR_DEBUG("error parsing request...");
return;
}
if (tb[IFLA_VFINFO_LIST]) {
VIR_DEBUG("FOUND IFLA_VFINFO_LIST!");
nla_for_each_nested(tb_vfinfo_list, tb[IFLA_VFINFO_LIST], rem) {
if (nla_type(tb_vfinfo_list) != IFLA_VF_INFO) {
VIR_DEBUG("nested parsing of"
"IFLA_VFINFO_LIST failed.");
return;
}
if (nla_parse_nested(tb_vfinfo, IFLA_VF_MAX,
tb_vfinfo_list, ifla_vf_policy)) {
VIR_DEBUG("nested parsing of "
"IFLA_VF_INFO failed.");
return;
}
}
if (tb_vfinfo[IFLA_VF_MAC]) {
struct ifla_vf_mac *mac = RTA_DATA(tb_vfinfo[IFLA_VF_MAC]);
unsigned char *m = mac->mac;
VIR_DEBUG("IFLA_VF_MAC = %2x:%2x:%2x:%2x:%2x:%2x",
m[0], m[1], m[2], m[3], m[4], m[5]);
if (virMacAddrCmpRaw(&calld->macaddress, mac->mac)) {
/* Repeat the same check for a broadcast mac */
size_t i;
for (i = 0; i < VIR_MAC_BUFLEN; i++) {
if (calld->macaddress.addr[i] != 0xff) {
VIR_DEBUG("MAC address match failed (wasn't broadcast)");
return;
}
}
}
}
if (tb_vfinfo[IFLA_VF_VLAN]) {
struct ifla_vf_vlan *vlan = RTA_DATA(tb_vfinfo[IFLA_VF_VLAN]);
VIR_DEBUG("IFLA_VF_VLAN = %d", vlan->vlan);
}
}
if (tb[IFLA_IFNAME]) {
ifname = (char *)RTA_DATA(tb[IFLA_IFNAME]);
VIR_DEBUG("IFLA_IFNAME = %s", ifname);
}
if (tb[IFLA_OPERSTATE]) {
rem = *(unsigned short *)RTA_DATA(tb[IFLA_OPERSTATE]);
VIR_DEBUG("IFLA_OPERSTATE = %d", rem);
}
if (tb[IFLA_VF_PORTS]) {
struct nlattr *tb_vf_ports;
VIR_DEBUG("found IFLA_VF_PORTS");
nla_for_each_nested(tb_vf_ports, tb[IFLA_VF_PORTS], rem) {
VIR_DEBUG("iterating");
if (nla_type(tb_vf_ports) != IFLA_VF_PORT) {
VIR_DEBUG("not a IFLA_VF_PORT. skipping");
continue;
}
if (nla_parse_nested(tb3, IFLA_PORT_MAX, tb_vf_ports,
ifla_port_policy)) {
VIR_DEBUG("nested parsing on level 2"
" failed.");
}
if (tb3[IFLA_PORT_VF]) {
VIR_DEBUG("IFLA_PORT_VF = %d",
*(uint32_t *) (RTA_DATA(tb3[IFLA_PORT_VF])));
}
if (tb3[IFLA_PORT_PROFILE]) {
VIR_DEBUG("IFLA_PORT_PROFILE = %s",
(char *) RTA_DATA(tb3[IFLA_PORT_PROFILE]));
}
if (tb3[IFLA_PORT_VSI_TYPE]) {
struct ifla_port_vsi *pvsi;
int tid = 0;
pvsi = (struct ifla_port_vsi *)
RTA_DATA(tb3[IFLA_PORT_VSI_TYPE]);
tid = ((pvsi->vsi_type_id[2] << 16) |
(pvsi->vsi_type_id[1] << 8) |
pvsi->vsi_type_id[0]);
VIR_DEBUG("mgr_id: %d", pvsi->vsi_mgr_id);
VIR_DEBUG("type_id: %d", tid);
VIR_DEBUG("type_version: %d",
pvsi->vsi_type_version);
}
if (tb3[IFLA_PORT_INSTANCE_UUID]) {
char instance[INSTANCE_STRLEN + 2];
unsigned char *uuid;
uuid = (unsigned char *)
RTA_DATA(tb3[IFLA_PORT_INSTANCE_UUID]);
instance2str(uuid, instance, sizeof(instance));
VIR_DEBUG("IFLA_PORT_INSTANCE_UUID = %s",
instance);
}
if (tb3[IFLA_PORT_REQUEST]) {
uint8_t req = *(uint8_t *) RTA_DATA(tb3[IFLA_PORT_REQUEST]);
VIR_DEBUG("IFLA_PORT_REQUEST = %d", req);
if (req == PORT_REQUEST_DISASSOCIATE) {
VIR_DEBUG("Set disassociated.");
indicate = true;
}
}
if (tb3[IFLA_PORT_RESPONSE]) {
VIR_DEBUG("IFLA_PORT_RESPONSE = %d",
*(uint16_t *) RTA_DATA(tb3[IFLA_PORT_RESPONSE]));
}
}
}
if (!indicate)
return;
VIR_INFO("Re-send 802.1qbg associate request:");
VIR_INFO(" if: %s", calld->cr_ifname);
VIR_INFO(" lf: %s", calld->linkdev);
VIR_INFO(" mac: %s", virMacAddrFormat(&calld->macaddress, macaddr));
ignore_value(virNetDevVPortProfileAssociate(calld->cr_ifname,
calld->virtPortProfile,
&calld->macaddress,
calld->linkdev,
calld->vf,
calld->vmuuid,
calld->vmOp, true));
*handled = true;
return;
}
/**
* virNetlinkCallbackDataFree
*
* @calld: pointer to a virNetlinkCallbackData object to free
*
* This function frees all the data associated with a virNetlinkCallbackData object
* as well as the object itself. If called with NULL, it does nothing.
*
* Returns nothing.
*/
static void
virNetlinkCallbackDataFree(virNetlinkCallbackDataPtr calld)
{
if (calld) {
VIR_FREE(calld->cr_ifname);
VIR_FREE(calld->virtPortProfile);
VIR_FREE(calld->linkdev);
}
VIR_FREE(calld);
}
/**
* virNetDevMacVLanVPortProfileDestroyCallback:
*
* @watch: watch whose handle to remove
* @macaddr: macaddr whose handle to remove
* @opaque: Contains vital information regarding the associated vm
*
* This function is called when a netlink message handler is terminated.
* The function frees locally allocated data referenced in the opaque
* data, and the opaque object itself.
*/
static void
virNetDevMacVLanVPortProfileDestroyCallback(int watch G_GNUC_UNUSED,
const virMacAddr *macaddr G_GNUC_UNUSED,
void *opaque)
{
virNetlinkCallbackDataFree((virNetlinkCallbackDataPtr)opaque);
}
int
virNetDevMacVLanVPortProfileRegisterCallback(const char *ifname,
const virMacAddr *macaddress,
const char *linkdev,
const unsigned char *vmuuid,
const virNetDevVPortProfile *virtPortProfile,
virNetDevVPortProfileOp vmOp)
{
virNetlinkCallbackDataPtr calld = NULL;
if (virtPortProfile && virNetlinkEventServiceIsRunning(NETLINK_ROUTE)) {
if (VIR_ALLOC(calld) < 0)
goto error;
calld->cr_ifname = g_strdup(ifname);
if (VIR_ALLOC(calld->virtPortProfile) < 0)
goto error;
memcpy(calld->virtPortProfile, virtPortProfile, sizeof(*virtPortProfile));
virMacAddrSet(&calld->macaddress, macaddress);
calld->linkdev = g_strdup(linkdev);
memcpy(calld->vmuuid, vmuuid, sizeof(calld->vmuuid));
calld->vmOp = vmOp;
if (virNetlinkEventAddClient(virNetDevMacVLanVPortProfileCallback,
virNetDevMacVLanVPortProfileDestroyCallback,
calld, macaddress, NETLINK_ROUTE) < 0)
goto error;
}
return 0;
error:
virNetlinkCallbackDataFree(calld);
return -1;
}
/**
* virNetDevMacVLanCreateWithVPortProfile:
* Create an instance of a macvtap device and open its tap character
* device.
* @ifnameRequested: Interface name that the caller wants the macvtap
* device to have, or NULL to pick the first available name
* appropriate for the type (macvlan%d or macvtap%d). If the
* suggested name fits one of those patterns, but is already in
* use, we will fallback to finding the first available. If the
* suggested name *doesn't* fit a pattern and the name is in use,
* we will fail.
* @macaddress: The MAC address for the macvtap device
* @linkdev: The interface name of the NIC to connect to the external bridge
* @mode: macvtap mode (VIR_NETDEV_MACVLAN_MODE_(BRIDGE|VEPA|PRIVATE|PASSTHRU)
* @vmuuid: The UUID of the VM the macvtap belongs to
* @virtPortProfile: pointer to object holding the virtual port profile data
* @ifnameResult: Pointer to a string pointer where the actual name of the
* interface will be stored into if everything succeeded. It is up
* to the caller to free the string.
* @tapfd: array of file descriptor return value for the new tap device
* @tapfdSize: number of file descriptors in @tapfd
* @flags: OR of virNetDevMacVLanCreateFlags.
*
* Creates a macvlan device. Optionally, if flags &
* VIR_NETDEV_MACVLAN_CREATE_WITH_TAP is set, @tapfd is populated with FDs of
* tap devices up to @tapfdSize.
*
* Return 0 on success, -1 on error.
*/
int
virNetDevMacVLanCreateWithVPortProfile(const char *ifnameRequested,
const virMacAddr *macaddress,
const char *linkdev,
virNetDevMacVLanMode mode,
const virNetDevVlan *vlan,
const unsigned char *vmuuid,
const virNetDevVPortProfile *virtPortProfile,
char **ifnameResult,
virNetDevVPortProfileOp vmOp,
char *stateDir,
int *tapfd,
size_t tapfdSize,
unsigned int flags)
{
const char *type = VIR_NET_GENERATED_PREFIX;
g_autofree char *ifname = NULL;
uint32_t macvtapMode;
int vf = -1;
bool vnet_hdr = flags & VIR_NETDEV_MACVLAN_VNET_HDR;
macvtapMode = modeMap[mode];
*ifnameResult = NULL;
/** Note: When using PASSTHROUGH mode with MACVTAP devices the link
* device's MAC address must be set to the VMs MAC address. In
* order to not confuse the first switch or bridge in line this MAC
* address must be reset when the VM is shut down.
* This is especially important when using SRIOV capable cards that
* emulate their switch in firmware.
*/
if (mode == VIR_NETDEV_MACVLAN_MODE_PASSTHRU) {
bool setVlan = true;
if (virtPortProfile &&
virtPortProfile->virtPortType == VIR_NETDEV_VPORT_PROFILE_8021QBH) {
/* The Cisco enic driver (the only SRIOV-capable card that
* uses 802.1Qbh) doesn't support IFLA_VFINFO_LIST, which
* is required to get/set the vlan tag of a VF.
*/
setVlan = false;
}
if (virNetDevSaveNetConfig(linkdev, -1, stateDir, setVlan) < 0)
return -1;
if (virNetDevSetNetConfig(linkdev, -1, NULL, vlan, macaddress, setVlan) < 0)
return -1;
}
virMutexLock(&virNetDevMacVLanCreateMutex);
if (ifnameRequested) {
int rc;
bool isAutoName
= (STRPREFIX(ifnameRequested, VIR_NET_GENERATED_MACVTAP_PREFIX) ||
STRPREFIX(ifnameRequested, VIR_NET_GENERATED_MACVLAN_PREFIX));
VIR_INFO("Requested macvtap device name: %s", ifnameRequested);
if ((rc = virNetDevExists(ifnameRequested)) < 0) {
virMutexUnlock(&virNetDevMacVLanCreateMutex);
return -1;
}
if (rc) {
/* ifnameRequested is already being used */
if (!isAutoName) {
virReportSystemError(EEXIST,
_("Unable to create device '%s'"),
ifnameRequested);
virMutexUnlock(&virNetDevMacVLanCreateMutex);
return -1;
}
} else {
/* ifnameRequested is available. try to open it */
virNetDevMacVLanReserveNameInternal(ifnameRequested);
if (virNetDevMacVLanCreate(ifnameRequested, type, macaddress,
linkdev, macvtapMode) == 0) {
/* virNetDevMacVLanCreate() was successful - use this name */
ifname = g_strdup(ifnameRequested);
} else if (!isAutoName) {
/* coudn't open ifnameRequested, but it wasn't an
* autogenerated named, so there is nothing else to
* try - fail and return.
*/
virMutexUnlock(&virNetDevMacVLanCreateMutex);
return -1;
}
}
}
if (!ifname) {
/* ifnameRequested was NULL, or it was an already in use
* autogenerated name, so now we look for an unused
* autogenerated name.
*/
if (virNetDevMacVLanGenerateName(&ifname, flags) < 0 ||
virNetDevMacVLanCreate(ifname, type, macaddress,
linkdev, macvtapMode) < 0) {
virMutexUnlock(&virNetDevMacVLanCreateMutex);
return -1;
}
}
/* all done creating the device */
virMutexUnlock(&virNetDevMacVLanCreateMutex);
if (virNetDevVPortProfileAssociate(ifname,
virtPortProfile,
macaddress,
linkdev,
vf,
vmuuid, vmOp, false) < 0) {
goto link_del_exit;
}
if (flags & VIR_NETDEV_MACVLAN_CREATE_IFUP) {
if (virNetDevSetOnline(ifname, true) < 0)
goto disassociate_exit;
}
if (flags & VIR_NETDEV_MACVLAN_CREATE_WITH_TAP) {
if (virNetDevMacVLanTapOpen(ifname, tapfd, tapfdSize) < 0)
goto disassociate_exit;
if (virNetDevMacVLanTapSetup(tapfd, tapfdSize, vnet_hdr) < 0)
goto disassociate_exit;
}
if (vmOp == VIR_NETDEV_VPORT_PROFILE_OP_CREATE ||
vmOp == VIR_NETDEV_VPORT_PROFILE_OP_RESTORE) {
/* Only directly register upon a create or restore (restarting
* a saved image) - migration and libvirtd restart are handled
* elsewhere.
*/
if (virNetDevMacVLanVPortProfileRegisterCallback(ifname, macaddress,
linkdev, vmuuid,
virtPortProfile,
vmOp) < 0)
goto disassociate_exit;
}
*ifnameResult = g_steal_pointer(&ifname);
return 0;
disassociate_exit:
ignore_value(virNetDevVPortProfileDisassociate(ifname,
virtPortProfile,
macaddress,
linkdev,
vf,
vmOp));
while (tapfdSize--)
VIR_FORCE_CLOSE(tapfd[tapfdSize]);
link_del_exit:
ignore_value(virNetDevMacVLanDelete(ifname));
return -1;
}
/**
* virNetDevMacVLanDeleteWithVPortProfile:
* @ifname : The name of the macvtap interface
* @linkdev: The interface name of the NIC to connect to the external bridge
* @virtPortProfile: pointer to object holding the virtual port profile data
*
* Delete an interface given its name. Disassociate
* it with the switch if port profile parameters
* were provided.
*/
int virNetDevMacVLanDeleteWithVPortProfile(const char *ifname,
const virMacAddr *macaddr,
const char *linkdev,
int mode,
const virNetDevVPortProfile *virtPortProfile,
char *stateDir)
{
int ret = 0;
if (ifname) {
if (virNetDevVPortProfileDisassociate(ifname,
virtPortProfile,
macaddr,
linkdev,
-1,
VIR_NETDEV_VPORT_PROFILE_OP_DESTROY) < 0)
ret = -1;
if (virNetDevMacVLanDelete(ifname) < 0)
ret = -1;
}
if (mode == VIR_NETDEV_MACVLAN_MODE_PASSTHRU) {
g_autoptr(virMacAddr) MAC = NULL;
g_autoptr(virMacAddr) adminMAC = NULL;
g_autoptr(virNetDevVlan) vlan = NULL;
if ((virNetDevReadNetConfig(linkdev, -1, stateDir,
&adminMAC, &vlan, &MAC) == 0) &&
(adminMAC || vlan || MAC)) {
ignore_value(virNetDevSetNetConfig(linkdev, -1,
adminMAC, vlan, MAC, !!vlan));
}
}
virNetlinkEventRemoveClient(0, macaddr, NETLINK_ROUTE);
return ret;
}
/**
* virNetDevMacVLanRestartWithVPortProfile:
* Register a port profile callback handler for a VM that
* is already running
* .
* @cr_ifname: Interface name that the macvtap has.
* @macaddress: The MAC address for the macvtap device
* @linkdev: The interface name of the NIC to connect to the external bridge
* @vmuuid: The UUID of the VM the macvtap belongs to
* @virtPortProfile: pointer to object holding the virtual port profile data
* @vmOp: Operation to use during setup of the association
*
* Returns 0; returns -1 on error.
*/
int virNetDevMacVLanRestartWithVPortProfile(const char *cr_ifname,
const virMacAddr *macaddress,
const char *linkdev,
const unsigned char *vmuuid,
const virNetDevVPortProfile *virtPortProfile,
virNetDevVPortProfileOp vmOp)
{
int rc = 0;
rc = virNetDevMacVLanVPortProfileRegisterCallback(cr_ifname, macaddress,
linkdev, vmuuid,
virtPortProfile, vmOp);
if (rc < 0)
return rc;
ignore_value(virNetDevVPortProfileAssociate(cr_ifname,
virtPortProfile,
macaddress,
linkdev,
-1,
vmuuid,
vmOp, true));
return rc;
}
#else /* ! WITH_MACVTAP */
bool virNetDevMacVLanIsMacvtap(const char *ifname G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return false;
}
int virNetDevMacVLanCreate(const char *ifname G_GNUC_UNUSED,
const char *type G_GNUC_UNUSED,
const virMacAddr *macaddress G_GNUC_UNUSED,
const char *srcdev G_GNUC_UNUSED,
uint32_t macvlan_mode G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return -1;
}
int virNetDevMacVLanDelete(const char *ifname G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return -1;
}
int
virNetDevMacVLanTapOpen(const char *ifname G_GNUC_UNUSED,
int *tapfd G_GNUC_UNUSED,
size_t tapfdSize G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return -1;
}
int
virNetDevMacVLanTapSetup(int *tapfd G_GNUC_UNUSED,
size_t tapfdSize G_GNUC_UNUSED,
bool vnet_hdr G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return -1;
}
int virNetDevMacVLanCreateWithVPortProfile(const char *ifname G_GNUC_UNUSED,
const virMacAddr *macaddress G_GNUC_UNUSED,
const char *linkdev G_GNUC_UNUSED,
virNetDevMacVLanMode mode G_GNUC_UNUSED,
const virNetDevVlan *vlan G_GNUC_UNUSED,
const unsigned char *vmuuid G_GNUC_UNUSED,
const virNetDevVPortProfile *virtPortProfile G_GNUC_UNUSED,
char **res_ifname G_GNUC_UNUSED,
virNetDevVPortProfileOp vmop G_GNUC_UNUSED,
char *stateDir G_GNUC_UNUSED,
int *tapfd G_GNUC_UNUSED,
size_t tapfdSize G_GNUC_UNUSED,
unsigned int unused_flags G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return -1;
}
int virNetDevMacVLanDeleteWithVPortProfile(const char *ifname G_GNUC_UNUSED,
const virMacAddr *macaddress G_GNUC_UNUSED,
const char *linkdev G_GNUC_UNUSED,
int mode G_GNUC_UNUSED,
const virNetDevVPortProfile *virtPortProfile G_GNUC_UNUSED,
char *stateDir G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return -1;
}
int virNetDevMacVLanRestartWithVPortProfile(const char *cr_ifname G_GNUC_UNUSED,
const virMacAddr *macaddress G_GNUC_UNUSED,
const char *linkdev G_GNUC_UNUSED,
const unsigned char *vmuuid G_GNUC_UNUSED,
const virNetDevVPortProfile *virtPortProfile G_GNUC_UNUSED,
virNetDevVPortProfileOp vmOp G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return -1;
}
int virNetDevMacVLanVPortProfileRegisterCallback(const char *ifname G_GNUC_UNUSED,
const virMacAddr *macaddress G_GNUC_UNUSED,
const char *linkdev G_GNUC_UNUSED,
const unsigned char *vmuuid G_GNUC_UNUSED,
const virNetDevVPortProfile *virtPortProfile G_GNUC_UNUSED,
virNetDevVPortProfileOp vmOp G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
return -1;
}
void virNetDevMacVLanReserveName(const char *name G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot create macvlan devices on this platform"));
}
#endif /* ! WITH_MACVTAP */
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