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libvirt/src/network/bridge_driver.c
Laine Stump 36ba0ee7b9 network: don't "refresh" iptables rules on rule-less networks 
The bridge driver implementation of virNetworkUpdate() removes and
re-adds iptables rules any time a network has an <ip>, <forward>, or
<forward>/<interface> element updated. There are some types of
networks that have those elements and yet have no iptables rules
associated with them, and unfortunately the functions that remove/add
iptables rules don't check the type of network before attempting to
remove/add the rules, sometimes leading to an erroneous failure of the
entire update operation.

Under normal circumstances I would refactor the lower level functions
to be more robust, but to avoid code churn as much as possible, I've
just added extra checks directly to networkUpdate().
2012-09-21 20:10:43 -04:00

4100 lines
134 KiB
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/*
* bridge_driver.c: core driver methods for managing network
*
* Copyright (C) 2006-2012 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
*
* 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/>.
*
* Author: Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include <sys/types.h>
#include <sys/poll.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include "virterror_internal.h"
#include "datatypes.h"
#include "bridge_driver.h"
#include "network_conf.h"
#include "device_conf.h"
#include "driver.h"
#include "buf.h"
#include "virpidfile.h"
#include "util.h"
#include "command.h"
#include "memory.h"
#include "uuid.h"
#include "iptables.h"
#include "logging.h"
#include "dnsmasq.h"
#include "configmake.h"
#include "virnetdev.h"
#include "pci.h"
#include "virnetdevbridge.h"
#include "virnetdevtap.h"
#include "virnetdevvportprofile.h"
#include "virdbus.h"
#define NETWORK_PID_DIR LOCALSTATEDIR "/run/libvirt/network"
#define NETWORK_STATE_DIR LOCALSTATEDIR "/lib/libvirt/network"
#define DNSMASQ_STATE_DIR LOCALSTATEDIR "/lib/libvirt/dnsmasq"
#define RADVD_STATE_DIR LOCALSTATEDIR "/lib/libvirt/radvd"
#define VIR_FROM_THIS VIR_FROM_NETWORK
/* Main driver state */
struct network_driver {
virMutex lock;
virNetworkObjList networks;
iptablesContext *iptables;
char *networkConfigDir;
char *networkAutostartDir;
char *logDir;
};
static void networkDriverLock(struct network_driver *driver)
{
virMutexLock(&driver->lock);
}
static void networkDriverUnlock(struct network_driver *driver)
{
virMutexUnlock(&driver->lock);
}
static int networkShutdown(void);
static int networkStartNetwork(struct network_driver *driver,
virNetworkObjPtr network);
static int networkShutdownNetwork(struct network_driver *driver,
virNetworkObjPtr network);
static int networkStartNetworkVirtual(struct network_driver *driver,
virNetworkObjPtr network);
static int networkShutdownNetworkVirtual(struct network_driver *driver,
virNetworkObjPtr network);
static int networkStartNetworkExternal(struct network_driver *driver,
virNetworkObjPtr network);
static int networkShutdownNetworkExternal(struct network_driver *driver,
virNetworkObjPtr network);
static void networkReloadIptablesRules(struct network_driver *driver);
static void networkRefreshDaemons(struct network_driver *driver);
static struct network_driver *driverState = NULL;
static char *
networkDnsmasqLeaseFileNameDefault(const char *netname)
{
char *leasefile;
ignore_value(virAsprintf(&leasefile, DNSMASQ_STATE_DIR "/%s.leases",
netname));
return leasefile;
}
networkDnsmasqLeaseFileNameFunc networkDnsmasqLeaseFileName =
networkDnsmasqLeaseFileNameDefault;
static char *
networkRadvdPidfileBasename(const char *netname)
{
/* this is simple but we want to be sure it's consistently done */
char *pidfilebase;
ignore_value(virAsprintf(&pidfilebase, "%s-radvd", netname));
return pidfilebase;
}
static char *
networkRadvdConfigFileName(const char *netname)
{
char *configfile;
ignore_value(virAsprintf(&configfile, RADVD_STATE_DIR "/%s-radvd.conf",
netname));
return configfile;
}
static char *
networkBridgeDummyNicName(const char *brname)
{
static const char dummyNicSuffix[] = "-nic";
char *nicname;
if (strlen(brname) + sizeof(dummyNicSuffix) > IFNAMSIZ) {
/* because the length of an ifname is limited to IFNAMSIZ-1
* (usually 15), and we're adding 4 more characters, we must
* truncate the original name to 11 to fit. In order to catch
* a possible numeric ending (eg virbr0, virbr1, etc), we grab
* the first 8 and last 3 characters of the string.
*/
ignore_value(virAsprintf(&nicname, "%.*s%s%s",
/* space for last 3 chars + "-nic" + NULL */
(int)(IFNAMSIZ - (3 + sizeof(dummyNicSuffix))),
brname, brname + strlen(brname) - 3,
dummyNicSuffix));
} else {
ignore_value(virAsprintf(&nicname, "%s%s", brname, dummyNicSuffix));
}
return nicname;
}
static void
networkFindActiveConfigs(struct network_driver *driver) {
unsigned int i;
for (i = 0 ; i < driver->networks.count ; i++) {
virNetworkObjPtr obj = driver->networks.objs[i];
virNetworkDefPtr tmp;
char *config;
virNetworkObjLock(obj);
if ((config = virNetworkConfigFile(NETWORK_STATE_DIR,
obj->def->name)) == NULL) {
virNetworkObjUnlock(obj);
continue;
}
if (access(config, R_OK) < 0) {
VIR_FREE(config);
virNetworkObjUnlock(obj);
continue;
}
/* Try and load the live config */
tmp = virNetworkDefParseFile(config);
VIR_FREE(config);
if (tmp) {
obj->newDef = obj->def;
obj->def = tmp;
}
/* If bridge exists, then mark it active */
if (obj->def->bridge &&
virNetDevExists(obj->def->bridge) == 1) {
obj->active = 1;
/* Try and read dnsmasq/radvd pids if any */
if (obj->def->ips && (obj->def->nips > 0)) {
char *radvdpidbase;
ignore_value(virPidFileReadIfAlive(NETWORK_PID_DIR, obj->def->name,
&obj->dnsmasqPid, DNSMASQ));
if (!(radvdpidbase = networkRadvdPidfileBasename(obj->def->name))) {
virReportOOMError();
goto cleanup;
}
ignore_value(virPidFileReadIfAlive(NETWORK_PID_DIR, radvdpidbase,
&obj->radvdPid, RADVD));
VIR_FREE(radvdpidbase);
}
}
cleanup:
virNetworkObjUnlock(obj);
}
}
static void
networkAutostartConfigs(struct network_driver *driver) {
unsigned int i;
for (i = 0 ; i < driver->networks.count ; i++) {
virNetworkObjLock(driver->networks.objs[i]);
if (driver->networks.objs[i]->autostart &&
!virNetworkObjIsActive(driver->networks.objs[i])) {
if (networkStartNetwork(driver, driver->networks.objs[i]) < 0) {
/* failed to start but already logged */
}
}
virNetworkObjUnlock(driver->networks.objs[i]);
}
}
#if HAVE_FIREWALLD
static DBusHandlerResult
firewalld_dbus_filter_bridge(DBusConnection *connection ATTRIBUTE_UNUSED,
DBusMessage *message, void *user_data) {
struct network_driver *_driverState = user_data;
if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS,
"NameOwnerChanged") ||
dbus_message_is_signal(message, "org.fedoraproject.FirewallD1",
"Reloaded"))
{
VIR_DEBUG("Reload in bridge_driver because of firewalld.");
networkReloadIptablesRules(_driverState);
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
#endif
/**
* networkStartup:
*
* Initialization function for the QEmu daemon
*/
static int
networkStartup(int privileged) {
char *base = NULL;
#ifdef HAVE_FIREWALLD
DBusConnection *sysbus = NULL;
#endif
if (VIR_ALLOC(driverState) < 0)
goto error;
if (virMutexInit(&driverState->lock) < 0) {
VIR_FREE(driverState);
goto error;
}
networkDriverLock(driverState);
if (privileged) {
if (virAsprintf(&driverState->logDir,
"%s/log/libvirt/qemu", LOCALSTATEDIR) == -1)
goto out_of_memory;
if ((base = strdup (SYSCONFDIR "/libvirt")) == NULL)
goto out_of_memory;
} else {
char *userdir = virGetUserCacheDirectory();
if (!userdir)
goto error;
if (virAsprintf(&driverState->logDir,
"%s/qemu/log", userdir) == -1) {
VIR_FREE(userdir);
goto out_of_memory;
}
VIR_FREE(userdir);
userdir = virGetUserConfigDirectory();
if (virAsprintf(&base, "%s", userdir) == -1) {
VIR_FREE(userdir);
goto out_of_memory;
}
VIR_FREE(userdir);
}
/* Configuration paths are either ~/.libvirt/qemu/... (session) or
* /etc/libvirt/qemu/... (system).
*/
if (virAsprintf(&driverState->networkConfigDir, "%s/qemu/networks", base) == -1)
goto out_of_memory;
if (virAsprintf(&driverState->networkAutostartDir, "%s/qemu/networks/autostart",
base) == -1)
goto out_of_memory;
VIR_FREE(base);
if (!(driverState->iptables = iptablesContextNew())) {
goto out_of_memory;
}
if (virNetworkLoadAllConfigs(&driverState->networks,
driverState->networkConfigDir,
driverState->networkAutostartDir) < 0)
goto error;
networkFindActiveConfigs(driverState);
networkReloadIptablesRules(driverState);
networkRefreshDaemons(driverState);
networkAutostartConfigs(driverState);
networkDriverUnlock(driverState);
#ifdef HAVE_FIREWALLD
if (!(sysbus = virDBusGetSystemBus())) {
virErrorPtr err = virGetLastError();
VIR_WARN("DBus not available, disabling firewalld support "
"in bridge_driver: %s", err->message);
} else {
/* add matches for
* NameOwnerChanged on org.freedesktop.DBus for firewalld start/stop
* Reloaded on org.fedoraproject.FirewallD1 for firewalld reload
*/
dbus_bus_add_match(sysbus,
"type='signal'"
",interface='"DBUS_INTERFACE_DBUS"'"
",member='NameOwnerChanged'"
",arg0='org.fedoraproject.FirewallD1'",
NULL);
dbus_bus_add_match(sysbus,
"type='signal'"
",interface='org.fedoraproject.FirewallD1'"
",member='Reloaded'",
NULL);
dbus_connection_add_filter(sysbus, firewalld_dbus_filter_bridge,
driverState, NULL);
}
#endif
return 0;
out_of_memory:
virReportOOMError();
error:
if (driverState)
networkDriverUnlock(driverState);
VIR_FREE(base);
networkShutdown();
return -1;
}
/**
* networkReload:
*
* Function to restart the QEmu daemon, it will recheck the configuration
* files and update its state and the networking
*/
static int
networkReload(void) {
if (!driverState)
return 0;
networkDriverLock(driverState);
virNetworkLoadAllConfigs(&driverState->networks,
driverState->networkConfigDir,
driverState->networkAutostartDir);
networkReloadIptablesRules(driverState);
networkRefreshDaemons(driverState);
networkAutostartConfigs(driverState);
networkDriverUnlock(driverState);
return 0;
}
/**
* networkActive:
*
* Checks if the QEmu daemon is active, i.e. has an active domain or
* an active network
*
* Returns 1 if active, 0 otherwise
*/
static int
networkActive(void) {
unsigned int i;
int active = 0;
if (!driverState)
return 0;
networkDriverLock(driverState);
for (i = 0 ; i < driverState->networks.count ; i++) {
virNetworkObjPtr net = driverState->networks.objs[i];
virNetworkObjLock(net);
if (virNetworkObjIsActive(net))
active = 1;
virNetworkObjUnlock(net);
}
networkDriverUnlock(driverState);
return active;
}
/**
* networkShutdown:
*
* Shutdown the QEmu daemon, it will stop all active domains and networks
*/
static int
networkShutdown(void) {
if (!driverState)
return -1;
networkDriverLock(driverState);
/* free inactive networks */
virNetworkObjListFree(&driverState->networks);
VIR_FREE(driverState->logDir);
VIR_FREE(driverState->networkConfigDir);
VIR_FREE(driverState->networkAutostartDir);
if (driverState->iptables)
iptablesContextFree(driverState->iptables);
networkDriverUnlock(driverState);
virMutexDestroy(&driverState->lock);
VIR_FREE(driverState);
return 0;
}
/* networkKillDaemon:
*
* kill the specified pid/name, and wait a bit to make sure it's dead.
*/
static int
networkKillDaemon(pid_t pid, const char *daemonName, const char *networkName)
{
int ii, ret = -1;
const char *signame = "TERM";
/* send SIGTERM, then wait up to 3 seconds for the process to
* disappear, send SIGKILL, then wait for up to another 2
* seconds. If that fails, log a warning and continue, hoping
* for the best.
*/
for (ii = 0; ii < 25; ii++) {
int signum = 0;
if (ii == 0)
signum = SIGTERM;
else if (ii == 15) {
signum = SIGKILL;
signame = "KILL";
}
if (kill(pid, signum) < 0) {
if (errno == ESRCH) {
ret = 0;
} else {
char ebuf[1024];
VIR_WARN("Failed to terminate %s process %d "
"for network '%s' with SIG%s: %s",
daemonName, pid, networkName, signame,
virStrerror(errno, ebuf, sizeof(ebuf)));
}
goto cleanup;
}
/* NB: since networks have no reference count like
* domains, there is no safe way to unlock the network
* object temporarily, and so we can't follow the
* procedure used by the qemu driver of 1) unlock driver
* 2) sleep, 3) add ref to object 4) unlock object, 5)
* re-lock driver, 6) re-lock object. We may need to add
* that functionality eventually, but for now this
* function is rarely used and, at worst, leaving the
* network driver locked during this loop of sleeps will
* have the effect of holding up any other thread trying
* to make modifications to a network for up to 5 seconds;
* since modifications to networks are much less common
* than modifications to domains, this seems a reasonable
* tradeoff in exchange for less code disruption.
*/
usleep(20 * 1000);
}
VIR_WARN("Timed out waiting after SIG%s to %s process %d "
"(network '%s')",
signame, daemonName, pid, networkName);
cleanup:
return ret;
}
static int
networkBuildDnsmasqHostsfile(dnsmasqContext *dctx,
virNetworkIpDefPtr ipdef,
virNetworkDNSDefPtr dnsdef)
{
unsigned int i, j;
for (i = 0; i < ipdef->nhosts; i++) {
virNetworkDHCPHostDefPtr host = &(ipdef->hosts[i]);
if ((host->mac) && VIR_SOCKET_ADDR_VALID(&host->ip))
if (dnsmasqAddDhcpHost(dctx, host->mac, &host->ip, host->name) < 0)
return -1;
}
if (dnsdef) {
for (i = 0; i < dnsdef->nhosts; i++) {
virNetworkDNSHostsDefPtr host = &(dnsdef->hosts[i]);
if (VIR_SOCKET_ADDR_VALID(&host->ip)) {
for (j = 0; j < host->nnames; j++)
if (dnsmasqAddHost(dctx, &host->ip, host->names[j]) < 0)
return -1;
}
}
}
return 0;
}
static int
networkBuildDnsmasqArgv(virNetworkObjPtr network,
virNetworkIpDefPtr ipdef,
const char *pidfile,
virCommandPtr cmd,
dnsmasqContext *dctx)
{
int r, ret = -1;
int nbleases = 0;
int ii;
char *record = NULL;
char *recordPort = NULL;
char *recordWeight = NULL;
char *recordPriority = NULL;
virNetworkIpDefPtr tmpipdef;
/*
* NB, be careful about syntax for dnsmasq options in long format.
*
* If the flag has a mandatory argument, it can be given using
* either syntax:
*
* --foo bar
* --foo=bar
*
* If the flag has a optional argument, it *must* be given using
* the syntax:
*
* --foo=bar
*
* It is hard to determine whether a flag is optional or not,
* without reading the dnsmasq source :-( The manpage is not
* very explicit on this.
*/
/*
* Needed to ensure dnsmasq uses same algorithm for processing
* multiple namedriver entries in /etc/resolv.conf as GLibC.
*/
virCommandAddArgList(cmd, "--strict-order", "--bind-interfaces", NULL);
if (network->def->domain)
virCommandAddArgPair(cmd, "--domain", network->def->domain);
/* need to specify local even if no domain specified */
virCommandAddArgFormat(cmd, "--local=/%s/",
network->def->domain ? network->def->domain : "");
virCommandAddArg(cmd, "--domain-needed");
if (pidfile)
virCommandAddArgPair(cmd, "--pid-file", pidfile);
/* *no* conf file */
virCommandAddArg(cmd, "--conf-file=");
virCommandAddArgList(cmd,
"--except-interface", "lo",
NULL);
/* If this is an isolated network, set the default route option
* (3) to be empty to avoid setting a default route that's
* guaranteed to not work, and set --no-resolv so that no dns
* requests are forwarded on to the dns server listed in the
* host's /etc/resolv.conf (since this could be used as a channel
* to build a connection to the outside).
*/
if (network->def->forwardType == VIR_NETWORK_FORWARD_NONE) {
virCommandAddArgList(cmd, "--dhcp-option=3",
"--no-resolv", NULL);
}
if (network->def->dns != NULL) {
virNetworkDNSDefPtr dns = network->def->dns;
int i;
for (i = 0; i < dns->ntxtrecords; i++) {
virCommandAddArgFormat(cmd, "--txt-record=%s,%s",
dns->txtrecords[i].name,
dns->txtrecords[i].value);
}
for (i = 0; i < dns->nsrvrecords; i++) {
if (dns->srvrecords[i].service && dns->srvrecords[i].protocol) {
if (dns->srvrecords[i].port) {
if (virAsprintf(&recordPort, "%d", dns->srvrecords[i].port) < 0) {
virReportOOMError();
goto cleanup;
}
}
if (dns->srvrecords[i].priority) {
if (virAsprintf(&recordPriority, "%d", dns->srvrecords[i].priority) < 0) {
virReportOOMError();
goto cleanup;
}
}
if (dns->srvrecords[i].weight) {
if (virAsprintf(&recordWeight, "%d", dns->srvrecords[i].weight) < 0) {
virReportOOMError();
goto cleanup;
}
}
if (virAsprintf(&record, "%s.%s.%s,%s,%s,%s,%s",
dns->srvrecords[i].service,
dns->srvrecords[i].protocol,
dns->srvrecords[i].domain ? dns->srvrecords[i].domain : "",
dns->srvrecords[i].target ? dns->srvrecords[i].target : "",
recordPort ? recordPort : "",
recordPriority ? recordPriority : "",
recordWeight ? recordWeight : "") < 0) {
virReportOOMError();
goto cleanup;
}
virCommandAddArgPair(cmd, "--srv-host", record);
VIR_FREE(record);
VIR_FREE(recordPort);
VIR_FREE(recordWeight);
VIR_FREE(recordPriority);
}
}
}
/*
* --interface does not actually work with dnsmasq < 2.47,
* due to DAD for ipv6 addresses on the interface.
*
* virCommandAddArgList(cmd, "--interface", ipdef->bridge, NULL);
*
* So listen on all defined IPv[46] addresses
*/
for (ii = 0;
(tmpipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, ii));
ii++) {
char *ipaddr = virSocketAddrFormat(&tmpipdef->address);
if (!ipaddr)
goto cleanup;
virCommandAddArgList(cmd, "--listen-address", ipaddr, NULL);
VIR_FREE(ipaddr);
}
if (ipdef) {
for (r = 0 ; r < ipdef->nranges ; r++) {
char *saddr = virSocketAddrFormat(&ipdef->ranges[r].start);
if (!saddr)
goto cleanup;
char *eaddr = virSocketAddrFormat(&ipdef->ranges[r].end);
if (!eaddr) {
VIR_FREE(saddr);
goto cleanup;
}
virCommandAddArg(cmd, "--dhcp-range");
virCommandAddArgFormat(cmd, "%s,%s", saddr, eaddr);
VIR_FREE(saddr);
VIR_FREE(eaddr);
nbleases += virSocketAddrGetRange(&ipdef->ranges[r].start,
&ipdef->ranges[r].end);
}
/*
* For static-only DHCP, i.e. with no range but at least one host element,
* we have to add a special --dhcp-range option to enable the service in
* dnsmasq.
*/
if (!ipdef->nranges && ipdef->nhosts) {
char *bridgeaddr = virSocketAddrFormat(&ipdef->address);
if (!bridgeaddr)
goto cleanup;
virCommandAddArg(cmd, "--dhcp-range");
virCommandAddArgFormat(cmd, "%s,static", bridgeaddr);
VIR_FREE(bridgeaddr);
}
if (ipdef->nranges > 0) {
char *leasefile = networkDnsmasqLeaseFileName(network->def->name);
if (!leasefile)
goto cleanup;
virCommandAddArgFormat(cmd, "--dhcp-leasefile=%s", leasefile);
VIR_FREE(leasefile);
virCommandAddArgFormat(cmd, "--dhcp-lease-max=%d", nbleases);
}
if (ipdef->nranges || ipdef->nhosts)
virCommandAddArg(cmd, "--dhcp-no-override");
/* add domain to any non-qualified hostnames in /etc/hosts or addn-hosts */
if (network->def->domain)
virCommandAddArg(cmd, "--expand-hosts");
if (networkBuildDnsmasqHostsfile(dctx, ipdef, network->def->dns) < 0)
goto cleanup;
if (dctx->hostsfile->nhosts)
virCommandAddArgPair(cmd, "--dhcp-hostsfile",
dctx->hostsfile->path);
if (dctx->addnhostsfile->nhosts)
virCommandAddArgPair(cmd, "--addn-hosts",
dctx->addnhostsfile->path);
if (ipdef->tftproot) {
virCommandAddArgList(cmd, "--enable-tftp",
"--tftp-root", ipdef->tftproot,
NULL);
}
if (ipdef->bootfile) {
virCommandAddArg(cmd, "--dhcp-boot");
if (VIR_SOCKET_ADDR_VALID(&ipdef->bootserver)) {
char *bootserver = virSocketAddrFormat(&ipdef->bootserver);
if (!bootserver)
goto cleanup;
virCommandAddArgFormat(cmd, "%s%s%s",
ipdef->bootfile, ",,", bootserver);
VIR_FREE(bootserver);
} else {
virCommandAddArg(cmd, ipdef->bootfile);
}
}
}
ret = 0;
cleanup:
VIR_FREE(record);
VIR_FREE(recordPort);
VIR_FREE(recordWeight);
VIR_FREE(recordPriority);
return ret;
}
int
networkBuildDhcpDaemonCommandLine(virNetworkObjPtr network, virCommandPtr *cmdout,
char *pidfile, dnsmasqContext *dctx)
{
virCommandPtr cmd = NULL;
int ret = -1, ii;
virNetworkIpDefPtr ipdef;
network->dnsmasqPid = -1;
/* Look for first IPv4 address that has dhcp defined. */
/* We support dhcp config on 1 IPv4 interface only. */
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_INET, ii));
ii++) {
if (ipdef->nranges || ipdef->nhosts)
break;
}
/* If no IPv4 addresses had dhcp info, pick the first (if there were any). */
if (!ipdef)
ipdef = virNetworkDefGetIpByIndex(network->def, AF_INET, 0);
/* If there are no IP addresses at all (v4 or v6), return now, since
* there won't be any address for dnsmasq to listen on anyway.
* If there are any addresses, even if no dhcp ranges or static entries,
* we should continue and run dnsmasq, just for the DNS capabilities.
*/
if (!virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, 0))
return 0;
cmd = virCommandNew(DNSMASQ);
if (networkBuildDnsmasqArgv(network, ipdef, pidfile, cmd, dctx) < 0) {
goto cleanup;
}
if (cmdout)
*cmdout = cmd;
ret = 0;
cleanup:
if (ret < 0)
virCommandFree(cmd);
return ret;
}
static int
networkStartDhcpDaemon(virNetworkObjPtr network)
{
virCommandPtr cmd = NULL;
char *pidfile = NULL;
int ret = -1;
dnsmasqContext *dctx = NULL;
if (!virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, 0)) {
/* no IPv6 addresses, so we don't need to run radvd */
ret = 0;
goto cleanup;
}
if (virFileMakePath(NETWORK_PID_DIR) < 0) {
virReportSystemError(errno,
_("cannot create directory %s"),
NETWORK_PID_DIR);
goto cleanup;
}
if (virFileMakePath(NETWORK_STATE_DIR) < 0) {
virReportSystemError(errno,
_("cannot create directory %s"),
NETWORK_STATE_DIR);
goto cleanup;
}
if (!(pidfile = virPidFileBuildPath(NETWORK_PID_DIR, network->def->name))) {
virReportOOMError();
goto cleanup;
}
if (virFileMakePath(DNSMASQ_STATE_DIR) < 0) {
virReportSystemError(errno,
_("cannot create directory %s"),
DNSMASQ_STATE_DIR);
goto cleanup;
}
dctx = dnsmasqContextNew(network->def->name, DNSMASQ_STATE_DIR);
if (dctx == NULL)
goto cleanup;
ret = networkBuildDhcpDaemonCommandLine(network, &cmd, pidfile, dctx);
if (ret < 0)
goto cleanup;
ret = dnsmasqSave(dctx);
if (ret < 0)
goto cleanup;
ret = virCommandRun(cmd, NULL);
if (ret < 0) {
goto cleanup;
}
/*
* There really is no race here - when dnsmasq daemonizes, its
* leader process stays around until its child has actually
* written its pidfile. So by time virCommandRun exits it has
* waitpid'd and guaranteed the proess has started and written a
* pid
*/
ret = virPidFileRead(NETWORK_PID_DIR, network->def->name,
&network->dnsmasqPid);
if (ret < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(pidfile);
virCommandFree(cmd);
dnsmasqContextFree(dctx);
return ret;
}
/* networkRefreshDhcpDaemon:
* Update dnsmasq config files, then send a SIGHUP so that it rereads
* them.
*
* Returns 0 on success, -1 on failure.
*/
static int
networkRefreshDhcpDaemon(virNetworkObjPtr network)
{
int ret = -1, ii;
virNetworkIpDefPtr ipdef;
dnsmasqContext *dctx = NULL;
/* if there's no running dnsmasq, just start it */
if (network->dnsmasqPid <= 0 || (kill(network->dnsmasqPid, 0) < 0))
return networkStartDhcpDaemon(network);
/* Look for first IPv4 address that has dhcp defined. */
/* We support dhcp config on 1 IPv4 interface only. */
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_INET, ii));
ii++) {
if (ipdef->nranges || ipdef->nhosts)
break;
}
/* If no IPv4 addresses had dhcp info, pick the first (if there were any). */
if (!ipdef)
ipdef = virNetworkDefGetIpByIndex(network->def, AF_INET, 0);
if (!ipdef) {
/* no <ip> elements, so nothing to do */
return 0;
}
if (!(dctx = dnsmasqContextNew(network->def->name, DNSMASQ_STATE_DIR)))
goto cleanup;
if (networkBuildDnsmasqHostsfile(dctx, ipdef, network->def->dns) < 0)
goto cleanup;
if ((ret = dnsmasqSave(dctx)) < 0)
goto cleanup;
ret = kill(network->dnsmasqPid, SIGHUP);
cleanup:
dnsmasqContextFree(dctx);
return ret;
}
/* networkRestartDhcpDaemon:
*
* kill and restart dnsmasq, in order to update any config that is on
* the dnsmasq commandline (and any placed in separate config files).
*
* Returns 0 on success, -1 on failure.
*/
static int
networkRestartDhcpDaemon(virNetworkObjPtr network)
{
/* if there is a running dnsmasq, kill it */
if (network->dnsmasqPid > 0) {
networkKillDaemon(network->dnsmasqPid, "dnsmasq",
network->def->name);
network->dnsmasqPid = -1;
}
/* now start dnsmasq if it should be started */
return networkStartDhcpDaemon(network);
}
static int
networkRadvdConfContents(virNetworkObjPtr network, char **configstr)
{
virBuffer configbuf = VIR_BUFFER_INITIALIZER;;
int ret = -1, ii;
virNetworkIpDefPtr ipdef;
bool v6present = false;
*configstr = NULL;
/* create radvd config file appropriate for this network */
virBufferAsprintf(&configbuf, "interface %s\n"
"{\n"
" AdvSendAdvert on;\n"
" AdvManagedFlag off;\n"
" AdvOtherConfigFlag off;\n"
"\n",
network->def->bridge);
/* add a section for each IPv6 address in the config */
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_INET6, ii));
ii++) {
int prefix;
char *netaddr;
v6present = true;
prefix = virNetworkIpDefPrefix(ipdef);
if (prefix < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("bridge '%s' has an invalid prefix"),
network->def->bridge);
goto cleanup;
}
if (!(netaddr = virSocketAddrFormat(&ipdef->address)))
goto cleanup;
virBufferAsprintf(&configbuf,
" prefix %s/%d\n"
" {\n"
" AdvOnLink on;\n"
" AdvAutonomous on;\n"
" AdvRouterAddr off;\n"
" };\n",
netaddr, prefix);
VIR_FREE(netaddr);
}
/* only create the string if we found at least one IPv6 address */
if (v6present) {
virBufferAddLit(&configbuf, "};\n");
if (virBufferError(&configbuf)) {
virReportOOMError();
goto cleanup;
}
if (!(*configstr = virBufferContentAndReset(&configbuf))) {
virReportOOMError();
goto cleanup;
}
}
ret = 0;
cleanup:
virBufferFreeAndReset(&configbuf);
return ret;
}
/* write file and return it's name (which must be freed by caller) */
static int
networkRadvdConfWrite(virNetworkObjPtr network, char **configFile)
{
int ret = -1;
char *configStr = NULL;
char *myConfigFile = NULL;
if (!configFile)
configFile = &myConfigFile;
*configFile = NULL;
if (networkRadvdConfContents(network, &configStr) < 0)
goto cleanup;
if (!configStr) {
ret = 0;
goto cleanup;
}
/* construct the filename */
if (!(*configFile = networkRadvdConfigFileName(network->def->name))) {
virReportOOMError();
goto cleanup;
}
/* write the file */
if (virFileWriteStr(*configFile, configStr, 0600) < 0) {
virReportSystemError(errno,
_("couldn't write radvd config file '%s'"),
*configFile);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(configStr);
VIR_FREE(myConfigFile);
return ret;
}
static int
networkStartRadvd(virNetworkObjPtr network)
{
char *pidfile = NULL;
char *radvdpidbase = NULL;
char *configfile = NULL;
virCommandPtr cmd = NULL;
int ret = -1;
network->radvdPid = -1;
if (!virNetworkDefGetIpByIndex(network->def, AF_INET6, 0)) {
/* no IPv6 addresses, so we don't need to run radvd */
ret = 0;
goto cleanup;
}
if (!virFileIsExecutable(RADVD)) {
virReportSystemError(errno,
_("Cannot find %s - "
"Possibly the package isn't installed"),
RADVD);
goto cleanup;
}
if (virFileMakePath(NETWORK_PID_DIR) < 0) {
virReportSystemError(errno,
_("cannot create directory %s"),
NETWORK_PID_DIR);
goto cleanup;
}
if (virFileMakePath(RADVD_STATE_DIR) < 0) {
virReportSystemError(errno,
_("cannot create directory %s"),
RADVD_STATE_DIR);
goto cleanup;
}
/* construct pidfile name */
if (!(radvdpidbase = networkRadvdPidfileBasename(network->def->name))) {
virReportOOMError();
goto cleanup;
}
if (!(pidfile = virPidFileBuildPath(NETWORK_PID_DIR, radvdpidbase))) {
virReportOOMError();
goto cleanup;
}
if (networkRadvdConfWrite(network, &configfile) < 0)
goto cleanup;
/* prevent radvd from daemonizing itself with "--debug 1", and use
* a dummy pidfile name - virCommand will create the pidfile we
* want to use (this is necessary because radvd's internal
* daemonization and pidfile creation causes a race, and the
* virPidFileRead() below will fail if we use them).
* Unfortunately, it isn't possible to tell radvd to not create
* its own pidfile, so we just let it do so, with a slightly
* different name. Unused, but harmless.
*/
cmd = virCommandNewArgList(RADVD, "--debug", "1",
"--config", configfile,
"--pidfile", NULL);
virCommandAddArgFormat(cmd, "%s-bin", pidfile);
virCommandSetPidFile(cmd, pidfile);
virCommandDaemonize(cmd);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
if (virPidFileRead(NETWORK_PID_DIR, radvdpidbase, &network->radvdPid) < 0)
goto cleanup;
ret = 0;
cleanup:
virCommandFree(cmd);
VIR_FREE(configfile);
VIR_FREE(radvdpidbase);
VIR_FREE(pidfile);
return ret;
}
static int
networkRefreshRadvd(virNetworkObjPtr network)
{
/* if there's no running radvd, just start it */
if (network->radvdPid <= 0 || (kill(network->radvdPid, 0) < 0))
return networkStartRadvd(network);
if (!virNetworkDefGetIpByIndex(network->def, AF_INET6, 0)) {
/* no IPv6 addresses, so we don't need to run radvd */
return 0;
}
if (networkRadvdConfWrite(network, NULL) < 0)
return -1;
return kill(network->radvdPid, SIGHUP);
}
#if 0
/* currently unused, so it causes a build error unless we #if it out */
static int
networkRestartRadvd(virNetworkObjPtr network)
{
char *radvdpidbase;
/* if there is a running radvd, kill it */
if (network->radvdPid > 0) {
/* essentially ignore errors from the following two functions,
* since there's really no better recovery to be done than to
* just push ahead (and that may be exactly what's needed).
*/
if ((networkKillDaemon(network->dnsmasqPid, "radvd",
network->def->name) >= 0) &&
((radvdpidbase = networkRadvdPidfileBasename(network->def->name))
!= NULL)) {
virPidFileDelete(NETWORK_PID_DIR, radvdpidbase);
VIR_FREE(radvdpidbase);
}
network->radvdPid = -1;
}
/* now start radvd if it should be started */
return networkStartRadvd(network);
}
#endif /* #if 0 */
/* SIGHUP/restart any dnsmasq or radvd daemons.
* This should be called when libvirtd is restarted.
*/
static void
networkRefreshDaemons(struct network_driver *driver)
{
unsigned int i;
VIR_INFO("Refreshing network daemons");
for (i = 0 ; i < driver->networks.count ; i++) {
virNetworkObjPtr network = driver->networks.objs[i];
virNetworkObjLock(network);
if (virNetworkObjIsActive(network) &&
((network->def->forwardType == VIR_NETWORK_FORWARD_NONE) ||
(network->def->forwardType == VIR_NETWORK_FORWARD_NAT) ||
(network->def->forwardType == VIR_NETWORK_FORWARD_ROUTE))) {
/* Only the three L3 network types that are configured by
* libvirt will have a dnsmasq or radvd daemon associated
* with them. Here we send a SIGHUP to an existing
* dnsmasq and/or radvd, or restart them if they've
* disappeared.
*/
networkRefreshDhcpDaemon(network);
networkRefreshRadvd(network);
}
virNetworkObjUnlock(network);
}
}
static int
networkAddMasqueradingIptablesRules(struct network_driver *driver,
virNetworkObjPtr network,
virNetworkIpDefPtr ipdef)
{
int prefix = virNetworkIpDefPrefix(ipdef);
const char *forwardIf = virNetworkDefForwardIf(network->def, 0);
if (prefix < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid prefix or netmask for '%s'"),
network->def->bridge);
goto masqerr1;
}
/* allow forwarding packets from the bridge interface */
if (iptablesAddForwardAllowOut(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow forwarding from '%s'"),
network->def->bridge);
goto masqerr1;
}
/* allow forwarding packets to the bridge interface if they are
* part of an existing connection
*/
if (iptablesAddForwardAllowRelatedIn(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow forwarding to '%s'"),
network->def->bridge);
goto masqerr2;
}
/*
* Enable masquerading.
*
* We need to end up with 3 rules in the table in this order
*
* 1. protocol=tcp with sport mapping restriction
* 2. protocol=udp with sport mapping restriction
* 3. generic any protocol
*
* The sport mappings are required, because default IPtables
* MASQUERADE maintain port numbers unchanged where possible.
*
* NFS can be configured to only "trust" port numbers < 1023.
*
* Guests using NAT thus need to be prevented from having port
* numbers < 1023, otherwise they can bypass the NFS "security"
* check on the source port number.
*
* Since we use '--insert' to add rules to the header of the
* chain, we actually need to add them in the reverse of the
* order just mentioned !
*/
/* First the generic masquerade rule for other protocols */
if (iptablesAddForwardMasquerade(driver->iptables,
&ipdef->address,
prefix,
forwardIf,
NULL) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
forwardIf ?
_("failed to add iptables rule to enable masquerading to %s") :
_("failed to add iptables rule to enable masquerading"),
forwardIf);
goto masqerr3;
}
/* UDP with a source port restriction */
if (iptablesAddForwardMasquerade(driver->iptables,
&ipdef->address,
prefix,
forwardIf,
"udp") < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
forwardIf ?
_("failed to add iptables rule to enable UDP masquerading to %s") :
_("failed to add iptables rule to enable UDP masquerading"),
forwardIf);
goto masqerr4;
}
/* TCP with a source port restriction */
if (iptablesAddForwardMasquerade(driver->iptables,
&ipdef->address,
prefix,
forwardIf,
"tcp") < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
forwardIf ?
_("failed to add iptables rule to enable TCP masquerading to %s") :
_("failed to add iptables rule to enable TCP masquerading"),
forwardIf);
goto masqerr5;
}
return 0;
masqerr5:
iptablesRemoveForwardMasquerade(driver->iptables,
&ipdef->address,
prefix,
forwardIf,
"udp");
masqerr4:
iptablesRemoveForwardMasquerade(driver->iptables,
&ipdef->address,
prefix,
forwardIf,
NULL);
masqerr3:
iptablesRemoveForwardAllowRelatedIn(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf);
masqerr2:
iptablesRemoveForwardAllowOut(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf);
masqerr1:
return -1;
}
static void
networkRemoveMasqueradingIptablesRules(struct network_driver *driver,
virNetworkObjPtr network,
virNetworkIpDefPtr ipdef)
{
int prefix = virNetworkIpDefPrefix(ipdef);
const char *forwardIf = virNetworkDefForwardIf(network->def, 0);
if (prefix >= 0) {
iptablesRemoveForwardMasquerade(driver->iptables,
&ipdef->address,
prefix,
forwardIf,
"tcp");
iptablesRemoveForwardMasquerade(driver->iptables,
&ipdef->address,
prefix,
forwardIf,
"udp");
iptablesRemoveForwardMasquerade(driver->iptables,
&ipdef->address,
prefix,
forwardIf,
NULL);
iptablesRemoveForwardAllowRelatedIn(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf);
iptablesRemoveForwardAllowOut(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf);
}
}
static int
networkAddRoutingIptablesRules(struct network_driver *driver,
virNetworkObjPtr network,
virNetworkIpDefPtr ipdef)
{
int prefix = virNetworkIpDefPrefix(ipdef);
const char *forwardIf = virNetworkDefForwardIf(network->def, 0);
if (prefix < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid prefix or netmask for '%s'"),
network->def->bridge);
goto routeerr1;
}
/* allow routing packets from the bridge interface */
if (iptablesAddForwardAllowOut(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow routing from '%s'"),
network->def->bridge);
goto routeerr1;
}
/* allow routing packets to the bridge interface */
if (iptablesAddForwardAllowIn(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow routing to '%s'"),
network->def->bridge);
goto routeerr2;
}
return 0;
routeerr2:
iptablesRemoveForwardAllowOut(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf);
routeerr1:
return -1;
}
static void
networkRemoveRoutingIptablesRules(struct network_driver *driver,
virNetworkObjPtr network,
virNetworkIpDefPtr ipdef)
{
int prefix = virNetworkIpDefPrefix(ipdef);
const char *forwardIf = virNetworkDefForwardIf(network->def, 0);
if (prefix >= 0) {
iptablesRemoveForwardAllowIn(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf);
iptablesRemoveForwardAllowOut(driver->iptables,
&ipdef->address,
prefix,
network->def->bridge,
forwardIf);
}
}
/* Add all once/network rules required for IPv6 (if any IPv6 addresses are defined) */
static int
networkAddGeneralIp6tablesRules(struct network_driver *driver,
virNetworkObjPtr network)
{
if (!virNetworkDefGetIpByIndex(network->def, AF_INET6, 0))
return 0;
/* Catch all rules to block forwarding to/from bridges */
if (iptablesAddForwardRejectOut(driver->iptables, AF_INET6,
network->def->bridge) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add ip6tables rule to block outbound traffic from '%s'"),
network->def->bridge);
goto err1;
}
if (iptablesAddForwardRejectIn(driver->iptables, AF_INET6,
network->def->bridge) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add ip6tables rule to block inbound traffic to '%s'"),
network->def->bridge);
goto err2;
}
/* Allow traffic between guests on the same bridge */
if (iptablesAddForwardAllowCross(driver->iptables, AF_INET6,
network->def->bridge) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add ip6tables rule to allow cross bridge traffic on '%s'"),
network->def->bridge);
goto err3;
}
/* allow DNS over IPv6 */
if (iptablesAddTcpInput(driver->iptables, AF_INET6,
network->def->bridge, 53) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add ip6tables rule to allow DNS requests from '%s'"),
network->def->bridge);
goto err4;
}
if (iptablesAddUdpInput(driver->iptables, AF_INET6,
network->def->bridge, 53) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add ip6tables rule to allow DNS requests from '%s'"),
network->def->bridge);
goto err5;
}
return 0;
/* unwind in reverse order from the point of failure */
err5:
iptablesRemoveTcpInput(driver->iptables, AF_INET6, network->def->bridge, 53);
err4:
iptablesRemoveForwardAllowCross(driver->iptables, AF_INET6, network->def->bridge);
err3:
iptablesRemoveForwardRejectIn(driver->iptables, AF_INET6, network->def->bridge);
err2:
iptablesRemoveForwardRejectOut(driver->iptables, AF_INET6, network->def->bridge);
err1:
return -1;
}
static void
networkRemoveGeneralIp6tablesRules(struct network_driver *driver,
virNetworkObjPtr network)
{
if (!virNetworkDefGetIpByIndex(network->def, AF_INET6, 0))
return;
iptablesRemoveForwardAllowCross(driver->iptables, AF_INET6, network->def->bridge);
iptablesRemoveForwardRejectIn(driver->iptables, AF_INET6, network->def->bridge);
iptablesRemoveForwardRejectOut(driver->iptables, AF_INET6, network->def->bridge);
}
static int
networkAddGeneralIptablesRules(struct network_driver *driver,
virNetworkObjPtr network)
{
int ii;
virNetworkIpDefPtr ipv4def;
/* First look for first IPv4 address that has dhcp or tftpboot defined. */
/* We support dhcp config on 1 IPv4 interface only. */
for (ii = 0;
(ipv4def = virNetworkDefGetIpByIndex(network->def, AF_INET, ii));
ii++) {
if (ipv4def->nranges || ipv4def->nhosts || ipv4def->tftproot)
break;
}
/* allow DHCP requests through to dnsmasq */
if (iptablesAddTcpInput(driver->iptables, AF_INET,
network->def->bridge, 67) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow DHCP requests from '%s'"),
network->def->bridge);
goto err1;
}
if (iptablesAddUdpInput(driver->iptables, AF_INET,
network->def->bridge, 67) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow DHCP requests from '%s'"),
network->def->bridge);
goto err2;
}
/* If we are doing local DHCP service on this network, attempt to
* add a rule that will fixup the checksum of DHCP response
* packets back to the guests (but report failure without
* aborting, since not all iptables implementations support it).
*/
if (ipv4def && (ipv4def->nranges || ipv4def->nhosts) &&
(iptablesAddOutputFixUdpChecksum(driver->iptables,
network->def->bridge, 68) < 0)) {
VIR_WARN("Could not add rule to fixup DHCP response checksums "
"on network '%s'.", network->def->name);
VIR_WARN("May need to update iptables package & kernel to support CHECKSUM rule.");
}
/* allow DNS requests through to dnsmasq */
if (iptablesAddTcpInput(driver->iptables, AF_INET,
network->def->bridge, 53) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow DNS requests from '%s'"),
network->def->bridge);
goto err3;
}
if (iptablesAddUdpInput(driver->iptables, AF_INET,
network->def->bridge, 53) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow DNS requests from '%s'"),
network->def->bridge);
goto err4;
}
/* allow TFTP requests through to dnsmasq if necessary */
if (ipv4def && ipv4def->tftproot &&
iptablesAddUdpInput(driver->iptables, AF_INET,
network->def->bridge, 69) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow TFTP requests from '%s'"),
network->def->bridge);
goto err5;
}
/* Catch all rules to block forwarding to/from bridges */
if (iptablesAddForwardRejectOut(driver->iptables, AF_INET,
network->def->bridge) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to block outbound traffic from '%s'"),
network->def->bridge);
goto err6;
}
if (iptablesAddForwardRejectIn(driver->iptables, AF_INET,
network->def->bridge) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to block inbound traffic to '%s'"),
network->def->bridge);
goto err7;
}
/* Allow traffic between guests on the same bridge */
if (iptablesAddForwardAllowCross(driver->iptables, AF_INET,
network->def->bridge) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add iptables rule to allow cross bridge traffic on '%s'"),
network->def->bridge);
goto err8;
}
/* add IPv6 general rules, if needed */
if (networkAddGeneralIp6tablesRules(driver, network) < 0) {
goto err9;
}
return 0;
/* unwind in reverse order from the point of failure */
err9:
iptablesRemoveForwardAllowCross(driver->iptables, AF_INET, network->def->bridge);
err8:
iptablesRemoveForwardRejectIn(driver->iptables, AF_INET, network->def->bridge);
err7:
iptablesRemoveForwardRejectOut(driver->iptables, AF_INET, network->def->bridge);
err6:
if (ipv4def && ipv4def->tftproot) {
iptablesRemoveUdpInput(driver->iptables, AF_INET, network->def->bridge, 69);
}
err5:
iptablesRemoveUdpInput(driver->iptables, AF_INET, network->def->bridge, 53);
err4:
iptablesRemoveTcpInput(driver->iptables, AF_INET, network->def->bridge, 53);
err3:
iptablesRemoveUdpInput(driver->iptables, AF_INET, network->def->bridge, 67);
err2:
iptablesRemoveTcpInput(driver->iptables, AF_INET, network->def->bridge, 67);
err1:
return -1;
}
static void
networkRemoveGeneralIptablesRules(struct network_driver *driver,
virNetworkObjPtr network)
{
int ii;
virNetworkIpDefPtr ipv4def;
networkRemoveGeneralIp6tablesRules(driver, network);
for (ii = 0;
(ipv4def = virNetworkDefGetIpByIndex(network->def, AF_INET, ii));
ii++) {
if (ipv4def->nranges || ipv4def->nhosts || ipv4def->tftproot)
break;
}
iptablesRemoveForwardAllowCross(driver->iptables, AF_INET, network->def->bridge);
iptablesRemoveForwardRejectIn(driver->iptables, AF_INET, network->def->bridge);
iptablesRemoveForwardRejectOut(driver->iptables, AF_INET, network->def->bridge);
if (ipv4def && ipv4def->tftproot) {
iptablesRemoveUdpInput(driver->iptables, AF_INET, network->def->bridge, 69);
}
iptablesRemoveUdpInput(driver->iptables, AF_INET, network->def->bridge, 53);
iptablesRemoveTcpInput(driver->iptables, AF_INET, network->def->bridge, 53);
if (ipv4def && (ipv4def->nranges || ipv4def->nhosts)) {
iptablesRemoveOutputFixUdpChecksum(driver->iptables,
network->def->bridge, 68);
}
iptablesRemoveUdpInput(driver->iptables, AF_INET, network->def->bridge, 67);
iptablesRemoveTcpInput(driver->iptables, AF_INET, network->def->bridge, 67);
}
static int
networkAddIpSpecificIptablesRules(struct network_driver *driver,
virNetworkObjPtr network,
virNetworkIpDefPtr ipdef)
{
/* NB: in the case of IPv6, routing rules are added when the
* forward mode is NAT. This is because IPv6 has no NAT.
*/
if (network->def->forwardType == VIR_NETWORK_FORWARD_NAT) {
if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET))
return networkAddMasqueradingIptablesRules(driver, network, ipdef);
else if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6))
return networkAddRoutingIptablesRules(driver, network, ipdef);
} else if (network->def->forwardType == VIR_NETWORK_FORWARD_ROUTE) {
return networkAddRoutingIptablesRules(driver, network, ipdef);
}
return 0;
}
static void
networkRemoveIpSpecificIptablesRules(struct network_driver *driver,
virNetworkObjPtr network,
virNetworkIpDefPtr ipdef)
{
if (network->def->forwardType == VIR_NETWORK_FORWARD_NAT) {
if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET))
networkRemoveMasqueradingIptablesRules(driver, network, ipdef);
else if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6))
networkRemoveRoutingIptablesRules(driver, network, ipdef);
} else if (network->def->forwardType == VIR_NETWORK_FORWARD_ROUTE) {
networkRemoveRoutingIptablesRules(driver, network, ipdef);
}
}
/* Add all rules for all ip addresses (and general rules) on a network */
static int
networkAddIptablesRules(struct network_driver *driver,
virNetworkObjPtr network)
{
int ii;
virNetworkIpDefPtr ipdef;
/* Add "once per network" rules */
if (networkAddGeneralIptablesRules(driver, network) < 0)
return -1;
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, ii));
ii++) {
/* Add address-specific iptables rules */
if (networkAddIpSpecificIptablesRules(driver, network, ipdef) < 0) {
goto err;
}
}
return 0;
err:
/* The final failed call to networkAddIpSpecificIptablesRules will
* have removed any rules it created, but we need to remove those
* added for previous IP addresses.
*/
while ((--ii >= 0) &&
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, ii))) {
networkRemoveIpSpecificIptablesRules(driver, network, ipdef);
}
networkRemoveGeneralIptablesRules(driver, network);
return -1;
}
/* Remove all rules for all ip addresses (and general rules) on a network */
static void
networkRemoveIptablesRules(struct network_driver *driver,
virNetworkObjPtr network)
{
int ii;
virNetworkIpDefPtr ipdef;
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, ii));
ii++) {
networkRemoveIpSpecificIptablesRules(driver, network, ipdef);
}
networkRemoveGeneralIptablesRules(driver, network);
}
static void
networkReloadIptablesRules(struct network_driver *driver)
{
unsigned int i;
VIR_INFO("Reloading iptables rules");
for (i = 0 ; i < driver->networks.count ; i++) {
virNetworkObjPtr network = driver->networks.objs[i];
virNetworkObjLock(network);
if (virNetworkObjIsActive(network) &&
((network->def->forwardType == VIR_NETWORK_FORWARD_NONE) ||
(network->def->forwardType == VIR_NETWORK_FORWARD_NAT) ||
(network->def->forwardType == VIR_NETWORK_FORWARD_ROUTE))) {
/* Only the three L3 network types that are configured by libvirt
* need to have iptables rules reloaded.
*/
networkRemoveIptablesRules(driver, network);
if (networkAddIptablesRules(driver, network) < 0) {
/* failed to add but already logged */
}
}
virNetworkObjUnlock(network);
}
}
/* Enable IP Forwarding. Return 0 for success, -1 for failure. */
static int
networkEnableIpForwarding(bool enableIPv4, bool enableIPv6)
{
int ret = 0;
if (enableIPv4)
ret = virFileWriteStr("/proc/sys/net/ipv4/ip_forward", "1\n", 0);
if (enableIPv6 && ret == 0)
ret = virFileWriteStr("/proc/sys/net/ipv6/conf/all/forwarding", "1\n", 0);
return ret;
}
#define SYSCTL_PATH "/proc/sys"
static int
networkSetIPv6Sysctls(virNetworkObjPtr network)
{
char *field = NULL;
int ret = -1;
if (!virNetworkDefGetIpByIndex(network->def, AF_INET6, 0)) {
/* Only set disable_ipv6 if there are no ipv6 addresses defined for
* the network.
*/
if (virAsprintf(&field, SYSCTL_PATH "/net/ipv6/conf/%s/disable_ipv6",
network->def->bridge) < 0) {
virReportOOMError();
goto cleanup;
}
if (access(field, W_OK) < 0 && errno == ENOENT) {
VIR_DEBUG("ipv6 appears to already be disabled on %s",
network->def->bridge);
ret = 0;
goto cleanup;
}
if (virFileWriteStr(field, "1", 0) < 0) {
virReportSystemError(errno,
_("cannot write to %s to disable IPv6 on bridge %s"),
field, network->def->bridge);
goto cleanup;
}
VIR_FREE(field);
}
/* The rest of the ipv6 sysctl tunables should always be set,
* whether or not we're using ipv6 on this bridge.
*/
/* Prevent guests from hijacking the host network by sending out
* their own router advertisements.
*/
if (virAsprintf(&field, SYSCTL_PATH "/net/ipv6/conf/%s/accept_ra",
network->def->bridge) < 0) {
virReportOOMError();
goto cleanup;
}
if (virFileWriteStr(field, "0", 0) < 0) {
virReportSystemError(errno,
_("cannot disable %s"), field);
goto cleanup;
}
VIR_FREE(field);
/* All interfaces used as a gateway (which is what this is, by
* definition), must always have autoconf=0.
*/
if (virAsprintf(&field, SYSCTL_PATH "/net/ipv6/conf/%s/autoconf",
network->def->bridge) < 0) {
virReportOOMError();
goto cleanup;
}
if (virFileWriteStr(field, "0", 0) < 0) {
virReportSystemError(errno,
_("cannot disable %s"), field);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(field);
return ret;
}
#define PROC_NET_ROUTE "/proc/net/route"
/* XXX: This function can be a lot more exhaustive, there are certainly
* other scenarios where we can ruin host network connectivity.
* XXX: Using a proper library is preferred over parsing /proc
*/
static int
networkCheckRouteCollision(virNetworkObjPtr network)
{
int ret = 0, len;
char *cur, *buf = NULL;
enum {MAX_ROUTE_SIZE = 1024*64};
/* Read whole routing table into memory */
if ((len = virFileReadAll(PROC_NET_ROUTE, MAX_ROUTE_SIZE, &buf)) < 0)
goto out;
/* Dropping the last character shouldn't hurt */
if (len > 0)
buf[len-1] = '\0';
VIR_DEBUG("%s output:\n%s", PROC_NET_ROUTE, buf);
if (!STRPREFIX (buf, "Iface"))
goto out;
/* First line is just headings, skip it */
cur = strchr(buf, '\n');
if (cur)
cur++;
while (cur) {
char iface[17], dest[128], mask[128];
unsigned int addr_val, mask_val;
virNetworkIpDefPtr ipdef;
int num, ii;
/* NUL-terminate the line, so sscanf doesn't go beyond a newline. */
char *nl = strchr(cur, '\n');
if (nl) {
*nl++ = '\0';
}
num = sscanf(cur, "%16s %127s %*s %*s %*s %*s %*s %127s",
iface, dest, mask);
cur = nl;
if (num != 3) {
VIR_DEBUG("Failed to parse %s", PROC_NET_ROUTE);
continue;
}
if (virStrToLong_ui(dest, NULL, 16, &addr_val) < 0) {
VIR_DEBUG("Failed to convert network address %s to uint", dest);
continue;
}
if (virStrToLong_ui(mask, NULL, 16, &mask_val) < 0) {
VIR_DEBUG("Failed to convert network mask %s to uint", mask);
continue;
}
addr_val &= mask_val;
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_INET, ii));
ii++) {
unsigned int net_dest;
virSocketAddr netmask;
if (virNetworkIpDefNetmask(ipdef, &netmask) < 0) {
VIR_WARN("Failed to get netmask of '%s'",
network->def->bridge);
continue;
}
net_dest = (ipdef->address.data.inet4.sin_addr.s_addr &
netmask.data.inet4.sin_addr.s_addr);
if ((net_dest == addr_val) &&
(netmask.data.inet4.sin_addr.s_addr == mask_val)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Network is already in use by interface %s"),
iface);
ret = -1;
goto out;
}
}
}
out:
VIR_FREE(buf);
return ret;
}
static int
networkAddAddrToBridge(virNetworkObjPtr network,
virNetworkIpDefPtr ipdef)
{
int prefix = virNetworkIpDefPrefix(ipdef);
if (prefix < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("bridge '%s' has an invalid netmask or IP address"),
network->def->bridge);
return -1;
}
if (virNetDevSetIPv4Address(network->def->bridge,
&ipdef->address, prefix) < 0)
return -1;
return 0;
}
static int
networkStartNetworkVirtual(struct network_driver *driver,
virNetworkObjPtr network)
{
int ii;
bool v4present = false, v6present = false;
virErrorPtr save_err = NULL;
virNetworkIpDefPtr ipdef;
char *macTapIfName = NULL;
/* Check to see if any network IP collides with an existing route */
if (networkCheckRouteCollision(network) < 0)
return -1;
/* Create and configure the bridge device */
if (virNetDevBridgeCreate(network->def->bridge) < 0)
return -1;
if (network->def->mac_specified) {
/* To set a mac for the bridge, we need to define a dummy tap
* device, set its mac, then attach it to the bridge. As long
* as its mac address is lower than any other interface that
* gets attached, the bridge will always maintain this mac
* address.
*/
macTapIfName = networkBridgeDummyNicName(network->def->bridge);
if (!macTapIfName) {
virReportOOMError();
goto err0;
}
if (virNetDevTapCreateInBridgePort(network->def->bridge,
&macTapIfName, &network->def->mac,
NULL, NULL, NULL, NULL,
VIR_NETDEV_TAP_CREATE_USE_MAC_FOR_BRIDGE) < 0) {
VIR_FREE(macTapIfName);
goto err0;
}
}
/* Set bridge options */
/* delay is configured in seconds, but virNetDevBridgeSetSTPDelay
* expects milliseconds
*/
if (virNetDevBridgeSetSTPDelay(network->def->bridge,
network->def->delay * 1000) < 0)
goto err1;
if (virNetDevBridgeSetSTP(network->def->bridge,
network->def->stp ? true : false) < 0)
goto err1;
/* Disable IPv6 on the bridge if there are no IPv6 addresses
* defined, and set other IPv6 sysctl tunables appropriately.
*/
if (networkSetIPv6Sysctls(network) < 0)
goto err1;
/* Add "once per network" rules */
if (networkAddIptablesRules(driver, network) < 0)
goto err1;
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, ii));
ii++) {
if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET))
v4present = true;
if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6))
v6present = true;
/* Add the IP address/netmask to the bridge */
if (networkAddAddrToBridge(network, ipdef) < 0) {
goto err2;
}
}
/* Bring up the bridge interface */
if (virNetDevSetOnline(network->def->bridge, 1) < 0)
goto err2;
/* If forwardType != NONE, turn on global IP forwarding */
if (network->def->forwardType != VIR_NETWORK_FORWARD_NONE &&
networkEnableIpForwarding(v4present, v6present) < 0) {
virReportSystemError(errno, "%s",
_("failed to enable IP forwarding"));
goto err3;
}
/* start dnsmasq if there are any IP addresses (v4 or v6) */
if ((v4present || v6present) && networkStartDhcpDaemon(network) < 0)
goto err3;
/* start radvd if there are any ipv6 addresses */
if (v6present && networkStartRadvd(network) < 0)
goto err4;
if (virNetDevBandwidthSet(network->def->bridge, network->def->bandwidth) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot set bandwidth limits on %s"),
network->def->bridge);
goto err5;
}
VIR_FREE(macTapIfName);
return 0;
err5:
virNetDevBandwidthClear(network->def->bridge);
err4:
if (!save_err)
save_err = virSaveLastError();
if (network->dnsmasqPid > 0) {
kill(network->dnsmasqPid, SIGTERM);
network->dnsmasqPid = -1;
}
err3:
if (!save_err)
save_err = virSaveLastError();
ignore_value(virNetDevSetOnline(network->def->bridge, 0));
err2:
if (!save_err)
save_err = virSaveLastError();
networkRemoveIptablesRules(driver, network);
err1:
if (!save_err)
save_err = virSaveLastError();
if (macTapIfName) {
ignore_value(virNetDevTapDelete(macTapIfName));
VIR_FREE(macTapIfName);
}
err0:
if (!save_err)
save_err = virSaveLastError();
ignore_value(virNetDevBridgeDelete(network->def->bridge));
if (save_err) {
virSetError(save_err);
virFreeError(save_err);
}
return -1;
}
static int networkShutdownNetworkVirtual(struct network_driver *driver,
virNetworkObjPtr network)
{
virNetDevBandwidthClear(network->def->bridge);
if (network->radvdPid > 0) {
char *radvdpidbase;
kill(network->radvdPid, SIGTERM);
/* attempt to delete the pidfile we created */
if (!(radvdpidbase = networkRadvdPidfileBasename(network->def->name))) {
virReportOOMError();
} else {
virPidFileDelete(NETWORK_PID_DIR, radvdpidbase);
VIR_FREE(radvdpidbase);
}
}
if (network->dnsmasqPid > 0)
kill(network->dnsmasqPid, SIGTERM);
if (network->def->mac_specified) {
char *macTapIfName = networkBridgeDummyNicName(network->def->bridge);
if (!macTapIfName) {
virReportOOMError();
} else {
ignore_value(virNetDevTapDelete(macTapIfName));
VIR_FREE(macTapIfName);
}
}
ignore_value(virNetDevSetOnline(network->def->bridge, 0));
networkRemoveIptablesRules(driver, network);
ignore_value(virNetDevBridgeDelete(network->def->bridge));
/* See if its still alive and really really kill it */
if (network->dnsmasqPid > 0 &&
(kill(network->dnsmasqPid, 0) == 0))
kill(network->dnsmasqPid, SIGKILL);
network->dnsmasqPid = -1;
if (network->radvdPid > 0 &&
(kill(network->radvdPid, 0) == 0))
kill(network->radvdPid, SIGKILL);
network->radvdPid = -1;
return 0;
}
static int
networkStartNetworkExternal(struct network_driver *driver ATTRIBUTE_UNUSED,
virNetworkObjPtr network ATTRIBUTE_UNUSED)
{
/* put anything here that needs to be done each time a network of
* type BRIDGE, PRIVATE, VEPA, HOSTDEV or PASSTHROUGH is started. On
* failure, undo anything you've done, and return -1. On success
* return 0.
*/
return 0;
}
static int networkShutdownNetworkExternal(struct network_driver *driver ATTRIBUTE_UNUSED,
virNetworkObjPtr network ATTRIBUTE_UNUSED)
{
/* put anything here that needs to be done each time a network of
* type BRIDGE, PRIVATE, VEPA, HOSTDEV or PASSTHROUGH is shutdown. On
* failure, undo anything you've done, and return -1. On success
* return 0.
*/
return 0;
}
static int
networkStartNetwork(struct network_driver *driver,
virNetworkObjPtr network)
{
int ret = 0;
if (virNetworkObjIsActive(network)) {
virReportError(VIR_ERR_OPERATION_INVALID,
"%s", _("network is already active"));
return -1;
}
if (virNetworkObjSetDefTransient(network, true) < 0)
return -1;
switch (network->def->forwardType) {
case VIR_NETWORK_FORWARD_NONE:
case VIR_NETWORK_FORWARD_NAT:
case VIR_NETWORK_FORWARD_ROUTE:
ret = networkStartNetworkVirtual(driver, network);
break;
case VIR_NETWORK_FORWARD_BRIDGE:
case VIR_NETWORK_FORWARD_PRIVATE:
case VIR_NETWORK_FORWARD_VEPA:
case VIR_NETWORK_FORWARD_PASSTHROUGH:
case VIR_NETWORK_FORWARD_HOSTDEV:
ret = networkStartNetworkExternal(driver, network);
break;
}
if (ret < 0)
return ret;
/* Persist the live configuration now that anything autogenerated
* is setup.
*/
if ((ret = virNetworkSaveStatus(NETWORK_STATE_DIR, network)) < 0) {
goto error;
}
VIR_INFO("Starting up network '%s'", network->def->name);
network->active = 1;
error:
if (ret < 0) {
virErrorPtr save_err = virSaveLastError();
int save_errno = errno;
networkShutdownNetwork(driver, network);
virSetError(save_err);
virFreeError(save_err);
errno = save_errno;
}
return ret;
}
static int networkShutdownNetwork(struct network_driver *driver,
virNetworkObjPtr network)
{
int ret = 0;
char *stateFile;
VIR_INFO("Shutting down network '%s'", network->def->name);
if (!virNetworkObjIsActive(network))
return 0;
stateFile = virNetworkConfigFile(NETWORK_STATE_DIR, network->def->name);
if (!stateFile)
return -1;
unlink(stateFile);
VIR_FREE(stateFile);
switch (network->def->forwardType) {
case VIR_NETWORK_FORWARD_NONE:
case VIR_NETWORK_FORWARD_NAT:
case VIR_NETWORK_FORWARD_ROUTE:
ret = networkShutdownNetworkVirtual(driver, network);
break;
case VIR_NETWORK_FORWARD_BRIDGE:
case VIR_NETWORK_FORWARD_PRIVATE:
case VIR_NETWORK_FORWARD_VEPA:
case VIR_NETWORK_FORWARD_PASSTHROUGH:
case VIR_NETWORK_FORWARD_HOSTDEV:
ret = networkShutdownNetworkExternal(driver, network);
break;
}
network->active = 0;
if (network->newDef) {
virNetworkDefFree(network->def);
network->def = network->newDef;
network->newDef = NULL;
}
return ret;
}
static virNetworkPtr networkLookupByUUID(virConnectPtr conn,
const unsigned char *uuid) {
struct network_driver *driver = conn->networkPrivateData;
virNetworkObjPtr network;
virNetworkPtr ret = NULL;
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, uuid);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching uuid"));
goto cleanup;
}
ret = virGetNetwork(conn, network->def->name, network->def->uuid);
cleanup:
if (network)
virNetworkObjUnlock(network);
return ret;
}
static virNetworkPtr networkLookupByName(virConnectPtr conn,
const char *name) {
struct network_driver *driver = conn->networkPrivateData;
virNetworkObjPtr network;
virNetworkPtr ret = NULL;
networkDriverLock(driver);
network = virNetworkFindByName(&driver->networks, name);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
_("no network with matching name '%s'"), name);
goto cleanup;
}
ret = virGetNetwork(conn, network->def->name, network->def->uuid);
cleanup:
if (network)
virNetworkObjUnlock(network);
return ret;
}
static virDrvOpenStatus networkOpenNetwork(virConnectPtr conn,
virConnectAuthPtr auth ATTRIBUTE_UNUSED,
unsigned int flags)
{
virCheckFlags(VIR_CONNECT_RO, VIR_DRV_OPEN_ERROR);
if (!driverState)
return VIR_DRV_OPEN_DECLINED;
conn->networkPrivateData = driverState;
return VIR_DRV_OPEN_SUCCESS;
}
static int networkCloseNetwork(virConnectPtr conn) {
conn->networkPrivateData = NULL;
return 0;
}
static int networkNumNetworks(virConnectPtr conn) {
int nactive = 0, i;
struct network_driver *driver = conn->networkPrivateData;
networkDriverLock(driver);
for (i = 0 ; i < driver->networks.count ; i++) {
virNetworkObjLock(driver->networks.objs[i]);
if (virNetworkObjIsActive(driver->networks.objs[i]))
nactive++;
virNetworkObjUnlock(driver->networks.objs[i]);
}
networkDriverUnlock(driver);
return nactive;
}
static int networkListNetworks(virConnectPtr conn, char **const names, int nnames) {
struct network_driver *driver = conn->networkPrivateData;
int got = 0, i;
networkDriverLock(driver);
for (i = 0 ; i < driver->networks.count && got < nnames ; i++) {
virNetworkObjLock(driver->networks.objs[i]);
if (virNetworkObjIsActive(driver->networks.objs[i])) {
if (!(names[got] = strdup(driver->networks.objs[i]->def->name))) {
virNetworkObjUnlock(driver->networks.objs[i]);
virReportOOMError();
goto cleanup;
}
got++;
}
virNetworkObjUnlock(driver->networks.objs[i]);
}
networkDriverUnlock(driver);
return got;
cleanup:
networkDriverUnlock(driver);
for (i = 0 ; i < got ; i++)
VIR_FREE(names[i]);
return -1;
}
static int networkNumDefinedNetworks(virConnectPtr conn) {
int ninactive = 0, i;
struct network_driver *driver = conn->networkPrivateData;
networkDriverLock(driver);
for (i = 0 ; i < driver->networks.count ; i++) {
virNetworkObjLock(driver->networks.objs[i]);
if (!virNetworkObjIsActive(driver->networks.objs[i]))
ninactive++;
virNetworkObjUnlock(driver->networks.objs[i]);
}
networkDriverUnlock(driver);
return ninactive;
}
static int networkListDefinedNetworks(virConnectPtr conn, char **const names, int nnames) {
struct network_driver *driver = conn->networkPrivateData;
int got = 0, i;
networkDriverLock(driver);
for (i = 0 ; i < driver->networks.count && got < nnames ; i++) {
virNetworkObjLock(driver->networks.objs[i]);
if (!virNetworkObjIsActive(driver->networks.objs[i])) {
if (!(names[got] = strdup(driver->networks.objs[i]->def->name))) {
virNetworkObjUnlock(driver->networks.objs[i]);
virReportOOMError();
goto cleanup;
}
got++;
}
virNetworkObjUnlock(driver->networks.objs[i]);
}
networkDriverUnlock(driver);
return got;
cleanup:
networkDriverUnlock(driver);
for (i = 0 ; i < got ; i++)
VIR_FREE(names[i]);
return -1;
}
static int
networkListAllNetworks(virConnectPtr conn,
virNetworkPtr **nets,
unsigned int flags)
{
struct network_driver *driver = conn->networkPrivateData;
int ret = -1;
virCheckFlags(VIR_CONNECT_LIST_NETWORKS_FILTERS_ALL, -1);
networkDriverLock(driver);
ret = virNetworkList(conn, driver->networks, nets, flags);
networkDriverUnlock(driver);
return ret;
}
static int networkIsActive(virNetworkPtr net)
{
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr obj;
int ret = -1;
networkDriverLock(driver);
obj = virNetworkFindByUUID(&driver->networks, net->uuid);
networkDriverUnlock(driver);
if (!obj) {
virReportError(VIR_ERR_NO_NETWORK, NULL);
goto cleanup;
}
ret = virNetworkObjIsActive(obj);
cleanup:
if (obj)
virNetworkObjUnlock(obj);
return ret;
}
static int networkIsPersistent(virNetworkPtr net)
{
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr obj;
int ret = -1;
networkDriverLock(driver);
obj = virNetworkFindByUUID(&driver->networks, net->uuid);
networkDriverUnlock(driver);
if (!obj) {
virReportError(VIR_ERR_NO_NETWORK, NULL);
goto cleanup;
}
ret = obj->persistent;
cleanup:
if (obj)
virNetworkObjUnlock(obj);
return ret;
}
static int
networkValidate(virNetworkDefPtr def)
{
int ii;
bool vlanUsed, vlanAllowed;
/* The only type of networks that currently support transparent
* vlan configuration are those using hostdev sr-iov devices from
* a pool, and those using an Open vSwitch bridge.
*/
vlanAllowed = (def->forwardType == VIR_NETWORK_FORWARD_BRIDGE &&
def->virtPortProfile &&
def->virtPortProfile->virtPortType == VIR_NETDEV_VPORT_PROFILE_OPENVSWITCH);
vlanUsed = def->vlan.nTags > 0;
for (ii = 0; ii < def->nPortGroups && !(vlanUsed && vlanAllowed); ii++) {
if (def->portGroups[ii].vlan.nTags > 0)
vlanUsed = true;
if (def->forwardType == VIR_NETWORK_FORWARD_BRIDGE &&
def->portGroups[ii].virtPortProfile &&
(def->portGroups[ii].virtPortProfile->virtPortType
== VIR_NETDEV_VPORT_PROFILE_OPENVSWITCH)) {
vlanAllowed = true;
}
}
if (vlanUsed && !vlanAllowed) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("<vlan> element specified for network %s, "
"whose type doesn't support vlan configuration"),
def->name);
return -1;
}
return 0;
}
static virNetworkPtr networkCreate(virConnectPtr conn, const char *xml) {
struct network_driver *driver = conn->networkPrivateData;
virNetworkDefPtr def;
virNetworkObjPtr network = NULL;
virNetworkPtr ret = NULL;
networkDriverLock(driver);
if (!(def = virNetworkDefParseString(xml)))
goto cleanup;
if (virNetworkObjIsDuplicate(&driver->networks, def, 1) < 0)
goto cleanup;
/* Only the three L3 network types that are configured by libvirt
* need to have a bridge device name / mac address provided
*/
if (def->forwardType == VIR_NETWORK_FORWARD_NONE ||
def->forwardType == VIR_NETWORK_FORWARD_NAT ||
def->forwardType == VIR_NETWORK_FORWARD_ROUTE) {
if (virNetworkSetBridgeName(&driver->networks, def, 1))
goto cleanup;
virNetworkSetBridgeMacAddr(def);
}
if (networkValidate(def) < 0)
goto cleanup;
/* NB: "live" is false because this transient network hasn't yet
* been started
*/
if (!(network = virNetworkAssignDef(&driver->networks, def, false)))
goto cleanup;
def = NULL;
if (networkStartNetwork(driver, network) < 0) {
virNetworkRemoveInactive(&driver->networks,
network);
network = NULL;
goto cleanup;
}
VIR_INFO("Creating network '%s'", network->def->name);
ret = virGetNetwork(conn, network->def->name, network->def->uuid);
cleanup:
virNetworkDefFree(def);
if (network)
virNetworkObjUnlock(network);
networkDriverUnlock(driver);
return ret;
}
static virNetworkPtr networkDefine(virConnectPtr conn, const char *xml) {
struct network_driver *driver = conn->networkPrivateData;
virNetworkIpDefPtr ipdef, ipv4def = NULL;
virNetworkDefPtr def;
bool freeDef = true;
virNetworkObjPtr network = NULL;
virNetworkPtr ret = NULL;
int ii;
dnsmasqContext* dctx = NULL;
networkDriverLock(driver);
if (!(def = virNetworkDefParseString(xml)))
goto cleanup;
if (virNetworkObjIsDuplicate(&driver->networks, def, 0) < 0)
goto cleanup;
/* Only the three L3 network types that are configured by libvirt
* need to have a bridge device name / mac address provided
*/
if (def->forwardType == VIR_NETWORK_FORWARD_NONE ||
def->forwardType == VIR_NETWORK_FORWARD_NAT ||
def->forwardType == VIR_NETWORK_FORWARD_ROUTE) {
if (virNetworkSetBridgeName(&driver->networks, def, 1))
goto cleanup;
virNetworkSetBridgeMacAddr(def);
}
/* We only support dhcp on one IPv4 address per defined network */
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(def, AF_UNSPEC, ii));
ii++) {
if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET)) {
if (ipdef->nranges || ipdef->nhosts) {
if (ipv4def) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Multiple dhcp sections found. "
"dhcp is supported only for a "
"single IPv4 address on each network"));
goto cleanup;
} else {
ipv4def = ipdef;
}
}
}
}
if (networkValidate(def) < 0)
goto cleanup;
if (!(network = virNetworkAssignDef(&driver->networks, def, false)))
goto cleanup;
freeDef = false;
network->persistent = 1;
if (virNetworkSaveConfig(driver->networkConfigDir, def) < 0) {
virNetworkRemoveInactive(&driver->networks, network);
network = NULL;
goto cleanup;
}
if (ipv4def) {
dctx = dnsmasqContextNew(def->name, DNSMASQ_STATE_DIR);
if (dctx == NULL ||
networkBuildDnsmasqHostsfile(dctx, ipv4def, def->dns) < 0 ||
dnsmasqSave(dctx) < 0)
goto cleanup;
}
VIR_INFO("Defining network '%s'", def->name);
ret = virGetNetwork(conn, def->name, def->uuid);
cleanup:
if (freeDef)
virNetworkDefFree(def);
dnsmasqContextFree(dctx);
if (network)
virNetworkObjUnlock(network);
networkDriverUnlock(driver);
return ret;
}
static int networkUndefine(virNetworkPtr net) {
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr network;
virNetworkIpDefPtr ipdef;
bool dhcp_present = false, v6present = false;
int ret = -1, ii;
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, net->uuid);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching uuid"));
goto cleanup;
}
if (virNetworkObjIsActive(network)) {
virReportError(VIR_ERR_OPERATION_INVALID,
"%s", _("network is still active"));
goto cleanup;
}
if (virNetworkDeleteConfig(driver->networkConfigDir,
driver->networkAutostartDir,
network) < 0)
goto cleanup;
/* we only support dhcp on one IPv4 address per defined network */
for (ii = 0;
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, ii));
ii++) {
if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET)) {
if (ipdef->nranges || ipdef->nhosts)
dhcp_present = true;
} else if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6)) {
v6present = true;
}
}
if (dhcp_present) {
char *leasefile;
dnsmasqContext *dctx = dnsmasqContextNew(network->def->name, DNSMASQ_STATE_DIR);
if (dctx == NULL)
goto cleanup;
dnsmasqDelete(dctx);
dnsmasqContextFree(dctx);
leasefile = networkDnsmasqLeaseFileName(network->def->name);
if (!leasefile)
goto cleanup;
unlink(leasefile);
VIR_FREE(leasefile);
}
if (v6present) {
char *configfile = networkRadvdConfigFileName(network->def->name);
if (!configfile) {
virReportOOMError();
goto cleanup;
}
unlink(configfile);
VIR_FREE(configfile);
char *radvdpidbase = networkRadvdPidfileBasename(network->def->name);
if (!(radvdpidbase)) {
virReportOOMError();
goto cleanup;
}
virPidFileDelete(NETWORK_PID_DIR, radvdpidbase);
VIR_FREE(radvdpidbase);
}
VIR_INFO("Undefining network '%s'", network->def->name);
virNetworkRemoveInactive(&driver->networks,
network);
network = NULL;
ret = 0;
cleanup:
if (network)
virNetworkObjUnlock(network);
networkDriverUnlock(driver);
return ret;
}
static int
networkUpdate(virNetworkPtr net,
unsigned int command,
unsigned int section,
int parentIndex,
const char *xml,
unsigned int flags)
{
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr network = NULL;
int isActive, ret = -1;
virCheckFlags(VIR_NETWORK_UPDATE_AFFECT_LIVE |
VIR_NETWORK_UPDATE_AFFECT_CONFIG,
-1);
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, net->uuid);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching uuid"));
goto cleanup;
}
/* VIR_NETWORK_UPDATE_AFFECT_CURRENT means "change LIVE if network
* is active, else change CONFIG
*/
isActive = virNetworkObjIsActive(network);
if ((flags & (VIR_NETWORK_UPDATE_AFFECT_LIVE
| VIR_NETWORK_UPDATE_AFFECT_CONFIG)) ==
VIR_NETWORK_UPDATE_AFFECT_CURRENT) {
if (isActive)
flags |= VIR_NETWORK_UPDATE_AFFECT_LIVE;
else
flags |= VIR_NETWORK_UPDATE_AFFECT_CONFIG;
}
/* update the network config in memory/on disk */
if (virNetworkObjUpdate(network, command, section, parentIndex, xml, flags) < 0)
goto cleanup;
if (flags & VIR_NETWORK_UPDATE_AFFECT_CONFIG) {
/* save updated persistent config to disk */
if (virNetworkSaveConfig(driver->networkConfigDir,
virNetworkObjGetPersistentDef(network)) < 0) {
goto cleanup;
}
}
if (isActive && (flags & VIR_NETWORK_UPDATE_AFFECT_LIVE)) {
/* rewrite dnsmasq host files, restart dnsmasq, update iptables
* rules, etc, according to which section was modified. Note that
* some sections require multiple actions, so a single switch
* statement is inadequate.
*/
if (section == VIR_NETWORK_SECTION_BRIDGE ||
section == VIR_NETWORK_SECTION_DOMAIN ||
section == VIR_NETWORK_SECTION_IP ||
section == VIR_NETWORK_SECTION_IP_DHCP_RANGE) {
/* these sections all change things on the dnsmasq commandline,
* so we need to kill and restart dnsmasq.
*/
if (networkRestartDhcpDaemon(network) < 0)
goto cleanup;
} else if (section == VIR_NETWORK_SECTION_IP_DHCP_HOST ||
section == VIR_NETWORK_SECTION_DNS_HOST ||
section == VIR_NETWORK_SECTION_DNS_TXT ||
section == VIR_NETWORK_SECTION_DNS_SRV) {
/* these sections only change things in config files, so we
* can just update the config files and send SIGHUP to
* dnsmasq.
*/
if (networkRefreshDhcpDaemon(network) < 0)
goto cleanup;
}
if (section == VIR_NETWORK_SECTION_IP) {
/* only a change in IP addresses will affect radvd, and all of radvd's
* config is stored in the conf file which will be re-read with a SIGHUP.
*/
if (networkRefreshRadvd(network) < 0)
goto cleanup;
}
if ((section == VIR_NETWORK_SECTION_IP ||
section == VIR_NETWORK_SECTION_FORWARD ||
section == VIR_NETWORK_SECTION_FORWARD_INTERFACE) &&
(network->def->forwardType == VIR_NETWORK_FORWARD_NONE ||
network->def->forwardType == VIR_NETWORK_FORWARD_NAT ||
network->def->forwardType == VIR_NETWORK_FORWARD_ROUTE)) {
/* these could affect the iptables rules */
networkRemoveIptablesRules(driver, network);
if (networkAddIptablesRules(driver, network) < 0)
goto cleanup;
}
/* save current network state to disk */
if ((ret = virNetworkSaveStatus(NETWORK_STATE_DIR, network)) < 0)
goto cleanup;
}
ret = 0;
cleanup:
if (network)
virNetworkObjUnlock(network);
networkDriverUnlock(driver);
return ret;
}
static int networkStart(virNetworkPtr net) {
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr network;
int ret = -1;
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, net->uuid);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching uuid"));
goto cleanup;
}
ret = networkStartNetwork(driver, network);
cleanup:
if (network)
virNetworkObjUnlock(network);
networkDriverUnlock(driver);
return ret;
}
static int networkDestroy(virNetworkPtr net) {
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr network;
int ret = -1;
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, net->uuid);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching uuid"));
goto cleanup;
}
if (!virNetworkObjIsActive(network)) {
virReportError(VIR_ERR_OPERATION_INVALID,
"%s", _("network is not active"));
goto cleanup;
}
ret = networkShutdownNetwork(driver, network);
if (!network->persistent) {
virNetworkRemoveInactive(&driver->networks,
network);
network = NULL;
}
cleanup:
if (network)
virNetworkObjUnlock(network);
networkDriverUnlock(driver);
return ret;
}
static char *networkGetXMLDesc(virNetworkPtr net,
unsigned int flags)
{
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr network;
virNetworkDefPtr def;
char *ret = NULL;
virCheckFlags(VIR_NETWORK_XML_INACTIVE, NULL);
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, net->uuid);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching uuid"));
goto cleanup;
}
if ((flags & VIR_NETWORK_XML_INACTIVE) && network->newDef)
def = network->newDef;
else
def = network->def;
ret = virNetworkDefFormat(def, flags);
cleanup:
if (network)
virNetworkObjUnlock(network);
return ret;
}
static char *networkGetBridgeName(virNetworkPtr net) {
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr network;
char *bridge = NULL;
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, net->uuid);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching id"));
goto cleanup;
}
if (!(network->def->bridge)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' does not have a bridge name."),
network->def->name);
goto cleanup;
}
bridge = strdup(network->def->bridge);
if (!bridge)
virReportOOMError();
cleanup:
if (network)
virNetworkObjUnlock(network);
return bridge;
}
static int networkGetAutostart(virNetworkPtr net,
int *autostart) {
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr network;
int ret = -1;
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, net->uuid);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching uuid"));
goto cleanup;
}
*autostart = network->autostart;
ret = 0;
cleanup:
if (network)
virNetworkObjUnlock(network);
return ret;
}
static int networkSetAutostart(virNetworkPtr net,
int autostart) {
struct network_driver *driver = net->conn->networkPrivateData;
virNetworkObjPtr network;
char *configFile = NULL, *autostartLink = NULL;
int ret = -1;
networkDriverLock(driver);
network = virNetworkFindByUUID(&driver->networks, net->uuid);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
"%s", _("no network with matching uuid"));
goto cleanup;
}
if (!network->persistent) {
virReportError(VIR_ERR_OPERATION_INVALID,
"%s", _("cannot set autostart for transient network"));
goto cleanup;
}
autostart = (autostart != 0);
if (network->autostart != autostart) {
if ((configFile = virNetworkConfigFile(driver->networkConfigDir, network->def->name)) == NULL)
goto cleanup;
if ((autostartLink = virNetworkConfigFile(driver->networkAutostartDir, network->def->name)) == NULL)
goto cleanup;
if (autostart) {
if (virFileMakePath(driver->networkAutostartDir) < 0) {
virReportSystemError(errno,
_("cannot create autostart directory '%s'"),
driver->networkAutostartDir);
goto cleanup;
}
if (symlink(configFile, autostartLink) < 0) {
virReportSystemError(errno,
_("Failed to create symlink '%s' to '%s'"),
autostartLink, configFile);
goto cleanup;
}
} else {
if (unlink(autostartLink) < 0 && errno != ENOENT && errno != ENOTDIR) {
virReportSystemError(errno,
_("Failed to delete symlink '%s'"),
autostartLink);
goto cleanup;
}
}
network->autostart = autostart;
}
ret = 0;
cleanup:
VIR_FREE(configFile);
VIR_FREE(autostartLink);
if (network)
virNetworkObjUnlock(network);
networkDriverUnlock(driver);
return ret;
}
static virNetworkDriver networkDriver = {
"Network",
.open = networkOpenNetwork, /* 0.2.0 */
.close = networkCloseNetwork, /* 0.2.0 */
.numOfNetworks = networkNumNetworks, /* 0.2.0 */
.listNetworks = networkListNetworks, /* 0.2.0 */
.numOfDefinedNetworks = networkNumDefinedNetworks, /* 0.2.0 */
.listDefinedNetworks = networkListDefinedNetworks, /* 0.2.0 */
.listAllNetworks = networkListAllNetworks, /* 0.10.2 */
.networkLookupByUUID = networkLookupByUUID, /* 0.2.0 */
.networkLookupByName = networkLookupByName, /* 0.2.0 */
.networkCreateXML = networkCreate, /* 0.2.0 */
.networkDefineXML = networkDefine, /* 0.2.0 */
.networkUndefine = networkUndefine, /* 0.2.0 */
.networkUpdate = networkUpdate, /* 0.10.2 */
.networkCreate = networkStart, /* 0.2.0 */
.networkDestroy = networkDestroy, /* 0.2.0 */
.networkGetXMLDesc = networkGetXMLDesc, /* 0.2.0 */
.networkGetBridgeName = networkGetBridgeName, /* 0.2.0 */
.networkGetAutostart = networkGetAutostart, /* 0.2.1 */
.networkSetAutostart = networkSetAutostart, /* 0.2.1 */
.networkIsActive = networkIsActive, /* 0.7.3 */
.networkIsPersistent = networkIsPersistent, /* 0.7.3 */
};
static virStateDriver networkStateDriver = {
"Network",
networkStartup,
networkShutdown,
networkReload,
networkActive,
};
int networkRegister(void) {
virRegisterNetworkDriver(&networkDriver);
virRegisterStateDriver(&networkStateDriver);
return 0;
}
/********************************************************/
/* Private API to deal with logical switch capabilities.
* These functions are exported so that other parts of libvirt can
* call them, but are not part of the public API and not in the
* driver's function table. If we ever have more than one network
* driver, we will need to present these functions via a second
* "backend" function table.
*/
/* networkCreateInterfacePool:
* @netdef: the original NetDef from the network
*
* Creates an implicit interface pool of VF's when a PF dev is given
*/
static int
networkCreateInterfacePool(virNetworkDefPtr netdef) {
unsigned int num_virt_fns = 0;
char **vfname = NULL;
struct pci_config_address **virt_fns;
int ret = -1, ii = 0;
if ((virNetDevGetVirtualFunctions(netdef->forwardPfs->dev,
&vfname, &virt_fns, &num_virt_fns)) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Could not get Virtual functions on %s"),
netdef->forwardPfs->dev);
goto finish;
}
if (num_virt_fns == 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("No Vf's present on SRIOV PF %s"),
netdef->forwardPfs->dev);
goto finish;
}
if ((VIR_ALLOC_N(netdef->forwardIfs, num_virt_fns)) < 0) {
virReportOOMError();
goto finish;
}
netdef->nForwardIfs = num_virt_fns;
for (ii = 0; ii < netdef->nForwardIfs; ii++) {
if ((netdef->forwardType == VIR_NETWORK_FORWARD_BRIDGE) ||
(netdef->forwardType == VIR_NETWORK_FORWARD_PRIVATE) ||
(netdef->forwardType == VIR_NETWORK_FORWARD_VEPA) ||
(netdef->forwardType == VIR_NETWORK_FORWARD_PASSTHROUGH)) {
netdef->forwardIfs[ii].type = VIR_NETWORK_FORWARD_HOSTDEV_DEVICE_NETDEV;
if(vfname[ii]) {
netdef->forwardIfs[ii].device.dev = strdup(vfname[ii]);
if (!netdef->forwardIfs[ii].device.dev) {
virReportOOMError();
goto finish;
}
}
else {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Direct mode types require interface names"));
goto finish;
}
}
else if (netdef->forwardType == VIR_NETWORK_FORWARD_HOSTDEV) {
/* VF's are always PCI devices */
netdef->forwardIfs[ii].type = VIR_NETWORK_FORWARD_HOSTDEV_DEVICE_PCI;
netdef->forwardIfs[ii].device.pci.domain = virt_fns[ii]->domain;
netdef->forwardIfs[ii].device.pci.bus = virt_fns[ii]->bus;
netdef->forwardIfs[ii].device.pci.slot = virt_fns[ii]->slot;
netdef->forwardIfs[ii].device.pci.function = virt_fns[ii]->function;
}
}
ret = 0;
finish:
for (ii = 0; ii < num_virt_fns; ii++) {
VIR_FREE(vfname[ii]);
VIR_FREE(virt_fns[ii]);
}
VIR_FREE(vfname);
VIR_FREE(virt_fns);
return ret;
}
/* networkAllocateActualDevice:
* @iface: the original NetDef from the domain
*
* Looks up the network reference by iface, allocates a physical
* device from that network (if appropriate), and returns with the
* virDomainActualNetDef filled in accordingly. If there are no
* changes to be made in the netdef, then just leave the actualdef
* empty.
*
* Returns 0 on success, -1 on failure.
*/
int
networkAllocateActualDevice(virDomainNetDefPtr iface)
{
struct network_driver *driver = driverState;
enum virDomainNetType actualType = iface->type;
virNetworkObjPtr network = NULL;
virNetworkDefPtr netdef = NULL;
virPortGroupDefPtr portgroup = NULL;
virNetDevVPortProfilePtr virtport = iface->virtPortProfile;
virNetDevVlanPtr vlan = NULL;
virNetworkForwardIfDefPtr dev = NULL;
int ii;
int ret = -1;
/* it's handy to have this initialized if we skip directly to validate */
if (iface->vlan.nTags > 0)
vlan = &iface->vlan;
if (iface->type != VIR_DOMAIN_NET_TYPE_NETWORK)
goto validate;
virDomainActualNetDefFree(iface->data.network.actual);
iface->data.network.actual = NULL;
networkDriverLock(driver);
network = virNetworkFindByName(&driver->networks, iface->data.network.name);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
_("no network with matching name '%s'"),
iface->data.network.name);
goto error;
}
netdef = network->def;
/* portgroup can be present for any type of network, in particular
* for bandwidth information, so we need to check for that and
* fill it in appropriately for all forward types.
*/
portgroup = virPortGroupFindByName(netdef, iface->data.network.portgroup);
/* If there is already interface-specific bandwidth, just use that
* (already in NetDef). Otherwise, if there is bandwidth info in
* the portgroup, fill that into the ActualDef.
*/
if (portgroup && !iface->bandwidth) {
if (!iface->data.network.actual
&& (VIR_ALLOC(iface->data.network.actual) < 0)) {
virReportOOMError();
goto error;
}
if (virNetDevBandwidthCopy(&iface->data.network.actual->bandwidth,
portgroup->bandwidth) < 0)
goto error;
}
if ((netdef->forwardType == VIR_NETWORK_FORWARD_NONE) ||
(netdef->forwardType == VIR_NETWORK_FORWARD_NAT) ||
(netdef->forwardType == VIR_NETWORK_FORWARD_ROUTE)) {
/* for these forward types, the actual net type really *is*
*NETWORK; we just keep the info from the portgroup in
* iface->data.network.actual
*/
if (iface->data.network.actual)
iface->data.network.actual->type = VIR_DOMAIN_NET_TYPE_NETWORK;
} else if ((netdef->forwardType == VIR_NETWORK_FORWARD_BRIDGE) &&
netdef->bridge) {
/* <forward type='bridge'/> <bridge name='xxx'/>
* is VIR_DOMAIN_NET_TYPE_BRIDGE
*/
if (!iface->data.network.actual
&& (VIR_ALLOC(iface->data.network.actual) < 0)) {
virReportOOMError();
goto error;
}
iface->data.network.actual->type = actualType = VIR_DOMAIN_NET_TYPE_BRIDGE;
iface->data.network.actual->data.bridge.brname = strdup(netdef->bridge);
if (!iface->data.network.actual->data.bridge.brname) {
virReportOOMError();
goto error;
}
/* merge virtualports from interface, network, and portgroup to
* arrive at actual virtualport to use
*/
if (virNetDevVPortProfileMerge3(&iface->data.network.actual->virtPortProfile,
iface->virtPortProfile,
netdef->virtPortProfile,
portgroup
? portgroup->virtPortProfile : NULL) < 0) {
goto error;
}
virtport = iface->data.network.actual->virtPortProfile;
if (virtport) {
/* only type='openvswitch' is allowed for bridges */
if (virtport->virtPortType != VIR_NETDEV_VPORT_PROFILE_OPENVSWITCH) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("<virtualport type='%s'> not supported for network "
"'%s' which uses a bridge device"),
virNetDevVPortTypeToString(virtport->virtPortType),
netdef->name);
goto error;
}
}
} else if (netdef->forwardType == VIR_NETWORK_FORWARD_HOSTDEV) {
if (!iface->data.network.actual
&& (VIR_ALLOC(iface->data.network.actual) < 0)) {
virReportOOMError();
goto error;
}
iface->data.network.actual->type = actualType = VIR_DOMAIN_NET_TYPE_HOSTDEV;
if (netdef->nForwardPfs > 0 && netdef->nForwardIfs <= 0 &&
networkCreateInterfacePool(netdef) < 0) {
goto error;
}
/* pick first dev with 0 connections */
for (ii = 0; ii < netdef->nForwardIfs; ii++) {
if (netdef->forwardIfs[ii].connections == 0) {
dev = &netdef->forwardIfs[ii];
break;
}
}
if (!dev) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' requires exclusive access "
"to interfaces, but none are available"),
netdef->name);
goto error;
}
iface->data.network.actual->data.hostdev.def.parent.type = VIR_DOMAIN_DEVICE_NET;
iface->data.network.actual->data.hostdev.def.parent.data.net = iface;
iface->data.network.actual->data.hostdev.def.info = &iface->info;
iface->data.network.actual->data.hostdev.def.mode = VIR_DOMAIN_HOSTDEV_MODE_SUBSYS;
iface->data.network.actual->data.hostdev.def.managed = netdef->managed;
iface->data.network.actual->data.hostdev.def.source.subsys.type = dev->type;
iface->data.network.actual->data.hostdev.def.source.subsys.u.pci = dev->device.pci;
/* merge virtualports from interface, network, and portgroup to
* arrive at actual virtualport to use
*/
if (virNetDevVPortProfileMerge3(&iface->data.network.actual->virtPortProfile,
iface->virtPortProfile,
netdef->virtPortProfile,
portgroup
? portgroup->virtPortProfile : NULL) < 0) {
goto error;
}
virtport = iface->data.network.actual->virtPortProfile;
if (virtport) {
/* make sure type is supported for hostdev connections */
if (virtport->virtPortType != VIR_NETDEV_VPORT_PROFILE_8021QBG &&
virtport->virtPortType != VIR_NETDEV_VPORT_PROFILE_8021QBH) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("<virtualport type='%s'> not supported for network "
"'%s' which uses an SR-IOV Virtual Function "
"via PCI passthrough"),
virNetDevVPortTypeToString(virtport->virtPortType),
netdef->name);
goto error;
}
}
} else if ((netdef->forwardType == VIR_NETWORK_FORWARD_BRIDGE) ||
(netdef->forwardType == VIR_NETWORK_FORWARD_PRIVATE) ||
(netdef->forwardType == VIR_NETWORK_FORWARD_VEPA) ||
(netdef->forwardType == VIR_NETWORK_FORWARD_PASSTHROUGH)) {
/* <forward type='bridge|private|vepa|passthrough'> are all
* VIR_DOMAIN_NET_TYPE_DIRECT.
*/
if (!iface->data.network.actual
&& (VIR_ALLOC(iface->data.network.actual) < 0)) {
virReportOOMError();
goto error;
}
/* Set type=direct and appropriate <source mode='xxx'/> */
iface->data.network.actual->type = actualType = VIR_DOMAIN_NET_TYPE_DIRECT;
switch (netdef->forwardType) {
case VIR_NETWORK_FORWARD_BRIDGE:
iface->data.network.actual->data.direct.mode = VIR_NETDEV_MACVLAN_MODE_BRIDGE;
break;
case VIR_NETWORK_FORWARD_PRIVATE:
iface->data.network.actual->data.direct.mode = VIR_NETDEV_MACVLAN_MODE_PRIVATE;
break;
case VIR_NETWORK_FORWARD_VEPA:
iface->data.network.actual->data.direct.mode = VIR_NETDEV_MACVLAN_MODE_VEPA;
break;
case VIR_NETWORK_FORWARD_PASSTHROUGH:
iface->data.network.actual->data.direct.mode = VIR_NETDEV_MACVLAN_MODE_PASSTHRU;
break;
}
/* merge virtualports from interface, network, and portgroup to
* arrive at actual virtualport to use
*/
if (virNetDevVPortProfileMerge3(&iface->data.network.actual->virtPortProfile,
iface->virtPortProfile,
netdef->virtPortProfile,
portgroup
? portgroup->virtPortProfile : NULL) < 0) {
goto error;
}
virtport = iface->data.network.actual->virtPortProfile;
if (virtport) {
/* make sure type is supported for macvtap connections */
if (virtport->virtPortType != VIR_NETDEV_VPORT_PROFILE_8021QBG &&
virtport->virtPortType != VIR_NETDEV_VPORT_PROFILE_8021QBH) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("<virtualport type='%s'> not supported for network "
"'%s' which uses a macvtap device"),
virNetDevVPortTypeToString(virtport->virtPortType),
netdef->name);
goto error;
}
}
/* If there is only a single device, just return it (caller will detect
* any error if exclusive use is required but could not be acquired).
*/
if ((netdef->nForwardIfs <= 0) && (netdef->nForwardPfs <= 0)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' uses a direct mode, but "
"has no forward dev and no interface pool"),
netdef->name);
goto error;
} else {
/* pick an interface from the pool */
if (netdef->nForwardPfs > 0 && netdef->nForwardIfs == 0 &&
networkCreateInterfacePool(netdef) < 0) {
goto error;
}
/* PASSTHROUGH mode, and PRIVATE Mode + 802.1Qbh both
* require exclusive access to a device, so current
* connections count must be 0. Other modes can share, so
* just search for the one with the lowest number of
* connections.
*/
if ((netdef->forwardType == VIR_NETWORK_FORWARD_PASSTHROUGH) ||
((netdef->forwardType == VIR_NETWORK_FORWARD_PRIVATE) &&
iface->data.network.actual->virtPortProfile &&
(iface->data.network.actual->virtPortProfile->virtPortType
== VIR_NETDEV_VPORT_PROFILE_8021QBH))) {
/* pick first dev with 0 connections */
for (ii = 0; ii < netdef->nForwardIfs; ii++) {
if (netdef->forwardIfs[ii].connections == 0) {
dev = &netdef->forwardIfs[ii];
break;
}
}
} else {
/* pick least used dev */
dev = &netdef->forwardIfs[0];
for (ii = 1; ii < netdef->nForwardIfs; ii++) {
if (netdef->forwardIfs[ii].connections < dev->connections)
dev = &netdef->forwardIfs[ii];
}
}
/* dev points at the physical device we want to use */
if (!dev) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' requires exclusive access "
"to interfaces, but none are available"),
netdef->name);
goto error;
}
iface->data.network.actual->data.direct.linkdev = strdup(dev->device.dev);
if (!iface->data.network.actual->data.direct.linkdev) {
virReportOOMError();
goto error;
}
}
}
if (virNetDevVPortProfileCheckComplete(virtport, true) < 0)
goto error;
/* copy appropriate vlan info to actualNet */
if (iface->vlan.nTags > 0)
vlan = &iface->vlan;
else if (portgroup && portgroup->vlan.nTags > 0)
vlan = &portgroup->vlan;
else if (netdef && netdef->vlan.nTags > 0)
vlan = &netdef->vlan;
if (virNetDevVlanCopy(&iface->data.network.actual->vlan, vlan) < 0)
goto error;
validate:
/* make sure that everything now specified for the device is
* actually supported on this type of network. NB: network,
* netdev, and iface->data.network.actual may all be NULL.
*/
if (vlan) {
/* vlan configuration via libvirt is only supported for
* PCI Passthrough SR-IOV devices and openvswitch bridges.
* otherwise log an error and fail
*/
if (!(actualType == VIR_DOMAIN_NET_TYPE_HOSTDEV ||
(actualType == VIR_DOMAIN_NET_TYPE_BRIDGE &&
virtport && virtport->virtPortType
== VIR_NETDEV_VPORT_PROFILE_OPENVSWITCH))) {
if (netdef) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("an interface connecting to network '%s' "
"is requesting a vlan tag, but that is not "
"supported for this type of network"),
netdef->name);
} else {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("an interface of type '%s' "
"is requesting a vlan tag, but that is not "
"supported for this type of connection"),
virDomainNetTypeToString(iface->type));
}
goto error;
}
}
if (dev) {
/* we are now assured of success, so mark the allocation */
dev->connections++;
if (actualType != VIR_DOMAIN_NET_TYPE_HOSTDEV) {
VIR_DEBUG("Using physical device %s, %d connections",
dev->device.dev, dev->connections);
} else {
VIR_DEBUG("Using physical device %04x:%02x:%02x.%x, connections %d",
dev->device.pci.domain, dev->device.pci.bus,
dev->device.pci.slot, dev->device.pci.function,
dev->connections);
}
}
if (netdef) {
netdef->connections++;
VIR_DEBUG("Using network %s, %d connections",
netdef->name, netdef->connections);
}
ret = 0;
cleanup:
if (network)
virNetworkObjUnlock(network);
return ret;
error:
if (iface->type == VIR_DOMAIN_NET_TYPE_NETWORK) {
virDomainActualNetDefFree(iface->data.network.actual);
iface->data.network.actual = NULL;
}
goto cleanup;
}
/* networkNotifyActualDevice:
* @iface: the domain's NetDef with an "actual" device already filled in.
*
* Called to notify the network driver when libvirtd is restarted and
* finds an already running domain. If appropriate it will force an
* allocation of the actual->direct.linkdev to get everything back in
* order.
*
* Returns 0 on success, -1 on failure.
*/
int
networkNotifyActualDevice(virDomainNetDefPtr iface)
{
struct network_driver *driver = driverState;
enum virDomainNetType actualType = virDomainNetGetActualType(iface);
virNetworkObjPtr network;
virNetworkDefPtr netdef;
virNetworkForwardIfDefPtr dev = NULL;
int ii, ret = -1;
if (iface->type != VIR_DOMAIN_NET_TYPE_NETWORK)
return 0;
networkDriverLock(driver);
network = virNetworkFindByName(&driver->networks, iface->data.network.name);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
_("no network with matching name '%s'"),
iface->data.network.name);
goto error;
}
netdef = network->def;
if (!iface->data.network.actual ||
(actualType != VIR_DOMAIN_NET_TYPE_DIRECT &&
actualType != VIR_DOMAIN_NET_TYPE_HOSTDEV)) {
VIR_DEBUG("Nothing to claim from network %s", iface->data.network.name);
goto success;
}
if (netdef->nForwardPfs > 0 && netdef->nForwardIfs == 0 &&
networkCreateInterfacePool(netdef) < 0) {
goto error;
}
if (netdef->nForwardIfs == 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' uses a direct or hostdev mode, "
"but has no forward dev and no interface pool"),
netdef->name);
goto error;
}
if (actualType == VIR_DOMAIN_NET_TYPE_DIRECT) {
const char *actualDev;
actualDev = virDomainNetGetActualDirectDev(iface);
if (!actualDev) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("the interface uses a direct mode, "
"but has no source dev"));
goto error;
}
/* find the matching interface and increment its connections */
for (ii = 0; ii < netdef->nForwardIfs; ii++) {
if (netdef->forwardIfs[ii].type
== VIR_NETWORK_FORWARD_HOSTDEV_DEVICE_NETDEV &&
STREQ(actualDev, netdef->forwardIfs[ii].device.dev)) {
dev = &netdef->forwardIfs[ii];
break;
}
}
/* dev points at the physical device we want to use */
if (!dev) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' doesn't have dev='%s' "
"in use by domain"),
netdef->name, actualDev);
goto error;
}
/* PASSTHROUGH mode and PRIVATE Mode + 802.1Qbh both require
* exclusive access to a device, so current connections count
* must be 0 in those cases.
*/
if ((dev->connections > 0) &&
((netdef->forwardType == VIR_NETWORK_FORWARD_PASSTHROUGH) ||
((netdef->forwardType == VIR_NETWORK_FORWARD_PRIVATE) &&
iface->data.network.actual->virtPortProfile &&
(iface->data.network.actual->virtPortProfile->virtPortType
== VIR_NETDEV_VPORT_PROFILE_8021QBH)))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' claims dev='%s' is already in "
"use by a different domain"),
netdef->name, actualDev);
goto error;
}
/* we are now assured of success, so mark the allocation */
dev->connections++;
VIR_DEBUG("Using physical device %s, connections %d",
dev->device.dev, dev->connections);
} else /* if (actualType == VIR_DOMAIN_NET_TYPE_HOSTDEV) */ {
virDomainHostdevDefPtr hostdev;
hostdev = virDomainNetGetActualHostdev(iface);
if (!hostdev) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("the interface uses a hostdev mode, "
"but has no hostdev"));
goto error;
}
/* find the matching interface and increment its connections */
for (ii = 0; ii < netdef->nForwardIfs; ii++) {
if (netdef->forwardIfs[ii].type
== VIR_NETWORK_FORWARD_HOSTDEV_DEVICE_PCI &&
(virDevicePCIAddressEqual(hostdev->source.subsys.u.pci,
netdef->forwardIfs[ii].device.pci) == 0)) {
dev = &netdef->forwardIfs[ii];
break;
}
}
/* dev points at the physical device we want to use */
if (!dev) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' doesn't have "
"PCI device %04x:%02x:%02x.%x in use by domain"),
netdef->name,
hostdev->source.subsys.u.pci.domain,
hostdev->source.subsys.u.pci.bus,
hostdev->source.subsys.u.pci.slot,
hostdev->source.subsys.u.pci.function);
goto error;
}
/* PASSTHROUGH mode, PRIVATE Mode + 802.1Qbh, and hostdev (PCI
* passthrough) all require exclusive access to a device, so
* current connections count must be 0 in those cases.
*/
if ((dev->connections > 0) &&
netdef->forwardType == VIR_NETWORK_FORWARD_HOSTDEV) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' claims the PCI device at "
"domain=%d bus=%d slot=%d function=%d "
"is already in use by a different domain"),
netdef->name,
dev->device.pci.domain, dev->device.pci.bus,
dev->device.pci.slot, dev->device.pci.function);
goto error;
}
/* we are now assured of success, so mark the allocation */
dev->connections++;
VIR_DEBUG("Using physical device %04x:%02x:%02x.%x, connections %d",
dev->device.pci.domain, dev->device.pci.bus,
dev->device.pci.slot, dev->device.pci.function,
dev->connections);
}
success:
netdef->connections++;
VIR_DEBUG("Using network %s, %d connections",
netdef->name, netdef->connections);
ret = 0;
cleanup:
if (network)
virNetworkObjUnlock(network);
return ret;
error:
goto cleanup;
}
/* networkReleaseActualDevice:
* @iface: a domain's NetDef (interface definition)
*
* Given a domain <interface> element that previously had its <actual>
* element filled in (and possibly a physical device allocated to it),
* free up the physical device for use by someone else, and free the
* virDomainActualNetDef.
*
* Returns 0 on success, -1 on failure.
*/
int
networkReleaseActualDevice(virDomainNetDefPtr iface)
{
struct network_driver *driver = driverState;
enum virDomainNetType actualType = virDomainNetGetActualType(iface);
virNetworkObjPtr network;
virNetworkDefPtr netdef;
virNetworkForwardIfDefPtr dev = NULL;
int ii, ret = -1;
if (iface->type != VIR_DOMAIN_NET_TYPE_NETWORK)
return 0;
networkDriverLock(driver);
network = virNetworkFindByName(&driver->networks, iface->data.network.name);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
_("no network with matching name '%s'"),
iface->data.network.name);
goto error;
}
netdef = network->def;
if ((!iface->data.network.actual) ||
((actualType != VIR_DOMAIN_NET_TYPE_DIRECT) &&
(actualType != VIR_DOMAIN_NET_TYPE_HOSTDEV))) {
VIR_DEBUG("Nothing to release to network %s", iface->data.network.name);
goto success;
}
if (netdef->nForwardIfs == 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' uses a direct/hostdev mode, but "
"has no forward dev and no interface pool"),
netdef->name);
goto error;
}
if (actualType == VIR_DOMAIN_NET_TYPE_DIRECT) {
const char *actualDev;
actualDev = virDomainNetGetActualDirectDev(iface);
if (!actualDev) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("the interface uses a direct mode, "
"but has no source dev"));
goto error;
}
for (ii = 0; ii < netdef->nForwardIfs; ii++) {
if (netdef->forwardIfs[ii].type
== VIR_NETWORK_FORWARD_HOSTDEV_DEVICE_NETDEV &&
STREQ(actualDev, netdef->forwardIfs[ii].device.dev)) {
dev = &netdef->forwardIfs[ii];
break;
}
}
if (!dev) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' doesn't have dev='%s' "
"in use by domain"),
netdef->name, actualDev);
goto error;
}
dev->connections--;
VIR_DEBUG("Releasing physical device %s, connections %d",
dev->device.dev, dev->connections);
} else /* if (actualType == VIR_DOMAIN_NET_TYPE_HOSTDEV) */ {
virDomainHostdevDefPtr hostdev;
hostdev = virDomainNetGetActualHostdev(iface);
if (!hostdev) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("the interface uses a hostdev mode, but has no hostdev"));
goto error;
}
for (ii = 0; ii < netdef->nForwardIfs; ii++) {
if (netdef->forwardIfs[ii].type
== VIR_NETWORK_FORWARD_HOSTDEV_DEVICE_PCI &&
(virDevicePCIAddressEqual(hostdev->source.subsys.u.pci,
netdef->forwardIfs[ii].device.pci) == 0)) {
dev = &netdef->forwardIfs[ii];
break;
}
}
if (!dev) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' doesn't have "
"PCI device %04x:%02x:%02x.%x in use by domain"),
netdef->name,
hostdev->source.subsys.u.pci.domain,
hostdev->source.subsys.u.pci.bus,
hostdev->source.subsys.u.pci.slot,
hostdev->source.subsys.u.pci.function);
goto error;
}
dev->connections--;
VIR_DEBUG("Releasing physical device %04x:%02x:%02x.%x, connections %d",
dev->device.pci.domain, dev->device.pci.bus,
dev->device.pci.slot, dev->device.pci.function,
dev->connections);
}
success:
netdef->connections--;
VIR_DEBUG("Releasing network %s, %d connections",
netdef->name, netdef->connections);
ret = 0;
cleanup:
if (network)
virNetworkObjUnlock(network);
if (iface->type == VIR_DOMAIN_NET_TYPE_NETWORK) {
virDomainActualNetDefFree(iface->data.network.actual);
iface->data.network.actual = NULL;
}
return ret;
error:
goto cleanup;
}
/*
* networkGetNetworkAddress:
* @netname: the name of a network
* @netaddr: string representation of IP address for that network.
*
* Attempt to return an IP (v4) address associated with the named
* network. If a libvirt virtual network, that will be provided in the
* configuration. For host bridge and direct (macvtap) networks, we
* must do an ioctl to learn the address.
*
* Note: This function returns the 1st IPv4 address it finds. It might
* be useful if it was more flexible, but the current use (getting a
* listen address for qemu's vnc/spice graphics server) can only use a
* single address anyway.
*
* Returns 0 on success, and puts a string (which must be free'd by
* the caller) into *netaddr. Returns -1 on failure or -2 if
* completely unsupported.
*/
int
networkGetNetworkAddress(const char *netname, char **netaddr)
{
int ret = -1;
struct network_driver *driver = driverState;
virNetworkObjPtr network;
virNetworkDefPtr netdef;
virNetworkIpDefPtr ipdef;
virSocketAddr addr;
virSocketAddrPtr addrptr = NULL;
char *dev_name = NULL;
*netaddr = NULL;
networkDriverLock(driver);
network = virNetworkFindByName(&driver->networks, netname);
networkDriverUnlock(driver);
if (!network) {
virReportError(VIR_ERR_NO_NETWORK,
_("no network with matching name '%s'"),
netname);
goto error;
}
netdef = network->def;
switch (netdef->forwardType) {
case VIR_NETWORK_FORWARD_NONE:
case VIR_NETWORK_FORWARD_NAT:
case VIR_NETWORK_FORWARD_ROUTE:
/* if there's an ipv4def, get it's address */
ipdef = virNetworkDefGetIpByIndex(netdef, AF_INET, 0);
if (!ipdef) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' doesn't have an IPv4 address"),
netdef->name);
break;
}
addrptr = &ipdef->address;
break;
case VIR_NETWORK_FORWARD_BRIDGE:
if ((dev_name = netdef->bridge))
break;
/*
* fall through if netdef->bridge wasn't set, since this is
* also a direct-mode interface.
*/
case VIR_NETWORK_FORWARD_PRIVATE:
case VIR_NETWORK_FORWARD_VEPA:
case VIR_NETWORK_FORWARD_PASSTHROUGH:
if ((netdef->nForwardIfs > 0) && netdef->forwardIfs)
dev_name = netdef->forwardIfs[0].device.dev;
if (!dev_name) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("network '%s' has no associated interface or bridge"),
netdef->name);
}
break;
}
if (dev_name) {
if (virNetDevGetIPv4Address(dev_name, &addr) < 0)
goto error;
addrptr = &addr;
}
if (!(addrptr &&
(*netaddr = virSocketAddrFormat(addrptr)))) {
goto error;
}
ret = 0;
cleanup:
if (network)
virNetworkObjUnlock(network);
return ret;
error:
goto cleanup;
}
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