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libvirt/src/util/virnetdevbridge.c
Laine Stump 97d26e470d util: fallback to ioctl(SIOCBRDELBR) if netlink RTM_DELLINK fails 
commit 09778e09 switched from using ioctl(SIOCBRDELBR) for bridge
device deletion to using a netlink RTM_DELLINK message, which is the
more modern way to delete a bridge (and also doesn't require the
bridge to be ~IFF_UP to succeed). However, although older kernels
(e.g. 2.6.32, in RHEL6/CentOS6) support deleting *some* link types
with RTM_NEWLINK, they don't support deleting bridges, and there is no
compile-time way to figure this out.

This patch moves the body of the SIOCBRDELBR version of
virNetDevBridgeDelete() into a static function, calls the new function
from the original, and also calls the new function from the
RTM_DELLINK version if the RTM_DELLINK message generates an EOPNOTSUPP
error. Since RTM_DELLINK is done from the subordinate function
virNetlinkDelLink, which is also called for other purposes (deleting a
macvtap interface), a function pointer called "fallback" has been
added to the arglist of virNetlinkDelLink() - if that arg != NULL, the
provided function will be called when (and only when) RTM_DELLINK
fails with EOPNOTSUPP.

Resolves:  https://bugzilla.redhat.com/show_bug.cgi?id=1252780 (part 2)
2015-08-28 16:39:30 -04:00

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/*
* Copyright (C) 2007-2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Authors:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "virnetdevbridge.h"
#include "virnetdev.h"
#include "virerror.h"
#include "virutil.h"
#include "virfile.h"
#include "viralloc.h"
#include "intprops.h"
#include "virstring.h"
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#ifdef __linux__
# if defined(HAVE_LIBNL)
# include "virnetlink.h"
# endif
# include <linux/sockios.h>
# include <linux/param.h> /* HZ */
# if NETINET_LINUX_WORKAROUND
/* Depending on the version of kernel vs. glibc, there may be a collision
* between <net/in.h> and kernel IPv6 structures. The different types
* are ABI compatible, but choke the C type system; work around it by
* using temporary redefinitions. */
# define in6_addr in6_addr_
# define sockaddr_in6 sockaddr_in6_
# define ipv6_mreq ipv6_mreq_
# define in6addr_any in6addr_any_
# define in6addr_loopback in6addr_loopback_
# endif
# include <linux/in6.h>
# include <linux/if_bridge.h> /* SYSFS_BRIDGE_ATTR */
# if NETINET_LINUX_WORKAROUND
# undef in6_addr
# undef sockaddr_in6
# undef ipv6_mreq
# undef in6addr_any
# undef in6addr_loopback
# endif
# define JIFFIES_TO_MS(j) (((j)*1000)/HZ)
# define MS_TO_JIFFIES(ms) (((ms)*HZ)/1000)
#endif
#if defined(HAVE_BSD_BRIDGE_MGMT)
# include <net/ethernet.h>
# include <net/if_bridgevar.h>
#endif
#define VIR_FROM_THIS VIR_FROM_NONE
#if defined(HAVE_BSD_BRIDGE_MGMT)
static int virNetDevBridgeCmd(const char *brname,
u_long op,
void *arg,
size_t argsize)
{
int s;
int ret = -1;
struct ifdrv ifd;
memset(&ifd, 0, sizeof(ifd));
if ((s = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0) {
virReportSystemError(errno, "%s",
_("Cannot open network interface control socket"));
return -1;
}
if (virStrcpyStatic(ifd.ifd_name, brname) == NULL) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
brname);
goto cleanup;
}
ifd.ifd_cmd = op;
ifd.ifd_len = argsize;
ifd.ifd_data = arg;
ret = ioctl(s, SIOCSDRVSPEC, &ifd);
cleanup:
VIR_FORCE_CLOSE(s);
return ret;
}
#endif
#if defined(HAVE_STRUCT_IFREQ) && defined(__linux__)
/*
* Bridge parameters can be set via sysfs on newish kernels,
* or by ioctl on older kernels. Perhaps we could just use
* ioctl for every kernel, but its not clear what the long
* term lifespan of the ioctl interface is...
*/
static int virNetDevBridgeSet(const char *brname,
const char *paramname, /* sysfs param name */
unsigned long value, /* new value */
int fd, /* control socket */
struct ifreq *ifr) /* pre-filled bridge name */
{
char *path = NULL;
int ret = -1;
if (virAsprintf(&path, SYSFS_NET_DIR "%s/bridge/%s", brname, paramname) < 0)
return -1;
if (virFileExists(path)) {
char valuestr[INT_BUFSIZE_BOUND(value)];
snprintf(valuestr, sizeof(valuestr), "%lu", value);
if (virFileWriteStr(path, valuestr, 0) < 0) {
virReportSystemError(errno,
_("Unable to set bridge %s %s"), brname, paramname);
goto cleanup;
}
} else {
unsigned long paramid;
if (STREQ(paramname, "stp_state")) {
paramid = BRCTL_SET_BRIDGE_STP_STATE;
} else if (STREQ(paramname, "forward_delay")) {
paramid = BRCTL_SET_BRIDGE_FORWARD_DELAY;
} else {
virReportSystemError(EINVAL,
_("Unable to set bridge %s %s"), brname, paramname);
goto cleanup;
}
unsigned long args[] = { paramid, value, 0, 0 };
ifr->ifr_data = (char*)&args;
if (ioctl(fd, SIOCDEVPRIVATE, ifr) < 0) {
virReportSystemError(errno,
_("Unable to set bridge %s %s"), brname, paramname);
goto cleanup;
}
}
ret = 0;
cleanup:
VIR_FREE(path);
return ret;
}
static int virNetDevBridgeGet(const char *brname,
const char *paramname, /* sysfs param name */
unsigned long *value, /* current value */
int fd, /* control socket */
struct ifreq *ifr) /* pre-filled bridge name */
{
char *path = NULL;
int ret = -1;
if (virAsprintf(&path, SYSFS_NET_DIR "%s/bridge/%s", brname, paramname) < 0)
return -1;
if (virFileExists(path)) {
char *valuestr;
if (virFileReadAll(path, INT_BUFSIZE_BOUND(unsigned long),
&valuestr) < 0)
goto cleanup;
if (virStrToLong_ul(valuestr, NULL, 10, value) < 0) {
virReportSystemError(EINVAL,
_("Unable to get bridge %s %s"),
brname, paramname);
VIR_FREE(valuestr);
goto cleanup;
}
VIR_FREE(valuestr);
} else {
struct __bridge_info info;
unsigned long args[] = { BRCTL_GET_BRIDGE_INFO, (unsigned long)&info, 0, 0 };
ifr->ifr_data = (char*)&args;
if (ioctl(fd, SIOCDEVPRIVATE, ifr) < 0) {
virReportSystemError(errno,
_("Unable to get bridge %s %s"), brname, paramname);
goto cleanup;
}
if (STREQ(paramname, "stp_state")) {
*value = info.stp_enabled;
} else if (STREQ(paramname, "forward_delay")) {
*value = info.forward_delay;
} else {
virReportSystemError(EINVAL,
_("Unable to get bridge %s %s"), brname, paramname);
goto cleanup;
}
}
ret = 0;
cleanup:
VIR_FREE(path);
return ret;
}
#endif /* __linux__ */
#if defined(__linux__)
static int
virNetDevBridgePortSet(const char *brname,
const char *ifname,
const char *paramname,
unsigned long value)
{
char *path = NULL;
char valuestr[INT_BUFSIZE_BOUND(value)];
int ret = -1;
snprintf(valuestr, sizeof(valuestr), "%lu", value);
if (virAsprintf(&path, SYSFS_NET_DIR "%s/brif/%s/%s",
brname, ifname, paramname) < 0)
return -1;
if (!virFileExists(path))
errno = EINVAL;
else
ret = virFileWriteStr(path, valuestr, 0);
if (ret < 0) {
virReportSystemError(errno,
_("Unable to set bridge %s port %s %s to %s"),
brname, ifname, paramname, valuestr);
}
VIR_FREE(path);
return ret;
}
static int
virNetDevBridgePortGet(const char *brname,
const char *ifname,
const char *paramname,
unsigned long *value)
{
char *path = NULL;
char *valuestr = NULL;
int ret = -1;
if (virAsprintf(&path, SYSFS_NET_DIR "%s/brif/%s/%s",
brname, ifname, paramname) < 0)
return -1;
if (virFileReadAll(path, INT_BUFSIZE_BOUND(unsigned long), &valuestr) < 0)
goto cleanup;
if (virStrToLong_ul(valuestr, NULL, 10, value) < 0) {
virReportSystemError(EINVAL,
_("Unable to get bridge %s port %s %s"),
brname, ifname, paramname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(path);
VIR_FREE(valuestr);
return ret;
}
int
virNetDevBridgePortGetLearning(const char *brname,
const char *ifname,
bool *enable)
{
int ret = -1;
unsigned long value;
if (virNetDevBridgePortGet(brname, ifname, "learning", &value) < 0)
goto cleanup;
*enable = !!value;
ret = 0;
cleanup:
return ret;
}
int
virNetDevBridgePortSetLearning(const char *brname,
const char *ifname,
bool enable)
{
return virNetDevBridgePortSet(brname, ifname, "learning", enable ? 1 : 0);
}
int
virNetDevBridgePortGetUnicastFlood(const char *brname,
const char *ifname,
bool *enable)
{
int ret = -1;
unsigned long value;
if (virNetDevBridgePortGet(brname, ifname, "unicast_flood", &value) < 0)
goto cleanup;
*enable = !!value;
ret = 0;
cleanup:
return ret;
}
int
virNetDevBridgePortSetUnicastFlood(const char *brname,
const char *ifname,
bool enable)
{
return virNetDevBridgePortSet(brname, ifname, "unicast_flood", enable ? 1 : 0);
}
#else
int
virNetDevBridgePortGetLearning(const char *brname ATTRIBUTE_UNUSED,
const char *ifname ATTRIBUTE_UNUSED,
bool *enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to get bridge port learning on this platform"));
return -1;
}
int
virNetDevBridgePortSetLearning(const char *brname ATTRIBUTE_UNUSED,
const char *ifname ATTRIBUTE_UNUSED,
bool enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to set bridge port learning on this platform"));
return -1;
}
int
virNetDevBridgePortGetUnicastFlood(const char *brname ATTRIBUTE_UNUSED,
const char *ifname ATTRIBUTE_UNUSED,
bool *enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to get bridge port unicast_flood on this platform"));
return -1;
}
int
virNetDevBridgePortSetUnicastFlood(const char *brname ATTRIBUTE_UNUSED,
const char *ifname ATTRIBUTE_UNUSED,
bool enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to set bridge port unicast_flood on this platform"));
return -1;
}
#endif
/**
* virNetDevBridgeCreate:
* @brname: the bridge name
*
* This function register a new bridge
*
* Returns 0 in case of success or -1 on failure
*/
#if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRADDBR)
static int
virNetDevBridgeCreateWithIoctl(const char *brname)
{
int fd = -1;
int ret = -1;
if ((fd = virNetDevSetupControl(NULL, NULL)) < 0)
return -1;
if (ioctl(fd, SIOCBRADDBR, brname) < 0) {
virReportSystemError(errno,
_("Unable to create bridge %s"), brname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#endif
#if defined(__linux__) && defined(HAVE_LIBNL)
int
virNetDevBridgeCreate(const char *brname)
{
/* use a netlink RTM_NEWLINK message to create the bridge */
const char *type = "bridge";
int rc = -1;
struct nlmsghdr *resp = NULL;
struct nlmsgerr *err;
struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
unsigned int recvbuflen;
struct nl_msg *nl_msg;
struct nlattr *linkinfo;
nl_msg = nlmsg_alloc_simple(RTM_NEWLINK,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
if (!nl_msg) {
virReportOOMError();
return -1;
}
if (nlmsg_append(nl_msg, &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO) < 0)
goto buffer_too_small;
if (nla_put(nl_msg, IFLA_IFNAME, strlen(brname)+1, brname) < 0)
goto buffer_too_small;
if (!(linkinfo = nla_nest_start(nl_msg, IFLA_LINKINFO)))
goto buffer_too_small;
if (nla_put(nl_msg, IFLA_INFO_KIND, strlen(type), type) < 0)
goto buffer_too_small;
nla_nest_end(nl_msg, linkinfo);
if (virNetlinkCommand(nl_msg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0) {
goto cleanup;
}
if (recvbuflen < NLMSG_LENGTH(0) || resp == NULL)
goto malformed_resp;
switch (resp->nlmsg_type) {
case NLMSG_ERROR:
err = (struct nlmsgerr *)NLMSG_DATA(resp);
if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
goto malformed_resp;
switch (err->error) {
case 0:
break;
case -EOPNOTSUPP:
# if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRADDBR)
/* fallback to ioctl if netlink doesn't support creating
* bridges
*/
rc = virNetDevBridgeCreateWithIoctl(brname);
goto cleanup;
# endif
/* intentionally fall through if virNetDevBridgeCreateWithIoctl()
* isn't available.
*/
default:
virReportSystemError(-err->error,
_("error creating bridge interface %s"),
brname);
goto cleanup;
}
break;
case NLMSG_DONE:
break;
default:
goto malformed_resp;
}
rc = 0;
cleanup:
nlmsg_free(nl_msg);
VIR_FREE(resp);
return rc;
malformed_resp:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("malformed netlink response message"));
goto cleanup;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
goto cleanup;
}
#elif defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRADDBR)
int
virNetDevBridgeCreate(const char *brname)
{
return virNetDevBridgeCreateWithIoctl(brname);
}
#elif defined(HAVE_STRUCT_IFREQ) && defined(SIOCIFCREATE2)
int
virNetDevBridgeCreate(const char *brname)
{
int s;
struct ifreq ifr;
int ret = - 1;
if ((s = virNetDevSetupControl("bridge", &ifr)) < 0)
return -1;
if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) {
virReportSystemError(errno, "%s",
_("Unable to create bridge device"));
goto cleanup;
}
if (virNetDevSetName(ifr.ifr_name, brname) == -1)
goto cleanup;
ret = 0;
cleanup:
VIR_FORCE_CLOSE(s);
return ret;
}
#else
int virNetDevBridgeCreate(const char *brname)
{
virReportSystemError(ENOSYS,
_("Unable to create bridge %s"), brname);
return -1;
}
#endif
/**
* virNetDevBridgeDelete:
* @brname: the bridge name
*
* Remove a bridge from the layer.
*
* Returns 0 in case of success or an errno code in case of failure.
*/
#if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRDELBR)
static int
virNetDevBridgeDeleteWithIoctl(const char *brname)
{
int fd = -1;
int ret = -1;
ignore_value(virNetDevSetOnline(brname, false));
if ((fd = virNetDevSetupControl(NULL, NULL)) < 0)
return -1;
if (ioctl(fd, SIOCBRDELBR, brname) < 0) {
virReportSystemError(errno,
_("Unable to delete bridge %s"), brname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#endif
#if defined(__linux__) && defined(HAVE_LIBNL)
int
virNetDevBridgeDelete(const char *brname)
{
/* If netlink is available, use it, as it is successful at
* deleting a bridge even if it is currently IFF_UP. fallback to
* using ioctl(SIOCBRDELBR) if netlink fails with EOPNOTSUPP.
*/
# if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRDELBR)
return virNetlinkDelLink(brname, virNetDevBridgeDeleteWithIoctl);
# else
return virNetlinkDelLink(brname, NULL);
# endif
}
#elif defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRDELBR)
int
virNetDevBridgeDelete(const char *brname)
{
return virNetDevBridgeDeleteWithIoctl(brname);
}
#elif defined(HAVE_STRUCT_IFREQ) && defined(SIOCIFDESTROY)
int
virNetDevBridgeDelete(const char *brname)
{
int s;
struct ifreq ifr;
int ret = -1;
if ((s = virNetDevSetupControl(brname, &ifr)) < 0)
return -1;
if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) {
virReportSystemError(errno,
_("Unable to remove bridge %s"),
brname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(s);
return ret;
}
#else
int virNetDevBridgeDelete(const char *brname ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to delete bridge %s"), brname);
return EINVAL;
}
#endif
/**
* virNetDevBridgeAddPort:
* @brname: the bridge name
* @ifname: the network interface name
*
* Adds an interface to a bridge
*
* Returns 0 in case of success or an errno code in case of failure.
*/
#if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRADDIF)
int virNetDevBridgeAddPort(const char *brname,
const char *ifname)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
return -1;
if (!(ifr.ifr_ifindex = if_nametoindex(ifname))) {
virReportSystemError(ENODEV,
_("Unable to get interface index for %s"), ifname);
goto cleanup;
}
if (ioctl(fd, SIOCBRADDIF, &ifr) < 0) {
virReportSystemError(errno,
_("Unable to add bridge %s port %s"), brname, ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#elif defined(HAVE_BSD_BRIDGE_MGMT)
int virNetDevBridgeAddPort(const char *brname,
const char *ifname)
{
struct ifbreq req;
memset(&req, 0, sizeof(req));
if (virStrcpyStatic(req.ifbr_ifsname, ifname) == NULL) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
ifname);
return -1;
}
if (virNetDevBridgeCmd(brname, BRDGADD, &req, sizeof(req)) < 0) {
virReportSystemError(errno,
_("Unable to add bridge %s port %s"), brname, ifname);
return -1;
}
return 0;
}
#else
int virNetDevBridgeAddPort(const char *brname,
const char *ifname)
{
virReportSystemError(ENOSYS,
_("Unable to add bridge %s port %s"), brname, ifname);
return -1;
}
#endif
/**
* virNetDevBridgeRemovePort:
* @brname: the bridge name
* @ifname: the network interface name
*
* Removes an interface from a bridge
*
* Returns 0 in case of success or an errno code in case of failure.
*/
#if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRDELIF)
int virNetDevBridgeRemovePort(const char *brname,
const char *ifname)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
return -1;
if (!(ifr.ifr_ifindex = if_nametoindex(ifname))) {
virReportSystemError(ENODEV,
_("Unable to get interface index for %s"), ifname);
goto cleanup;
}
if (ioctl(fd, SIOCBRDELIF, &ifr) < 0) {
virReportSystemError(errno,
_("Unable to remove bridge %s port %s"), brname, ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#elif defined(HAVE_BSD_BRIDGE_MGMT)
int virNetDevBridgeRemovePort(const char *brname,
const char *ifname)
{
struct ifbreq req;
memset(&req, 0, sizeof(req));
if (virStrcpyStatic(req.ifbr_ifsname, ifname) == NULL) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
ifname);
return -1;
}
if (virNetDevBridgeCmd(brname, BRDGDEL, &req, sizeof(req)) < 0) {
virReportSystemError(errno,
_("Unable to remove bridge %s port %s"), brname, ifname);
return -1;
}
return 0;
}
#else
int virNetDevBridgeRemovePort(const char *brname,
const char *ifname)
{
virReportSystemError(ENOSYS,
_("Unable to remove bridge %s port %s"), brname, ifname);
return -1;
}
#endif
#if defined(HAVE_STRUCT_IFREQ) && defined(__linux__)
/**
* virNetDevBridgeSetSTPDelay:
* @brname: the bridge name
* @delay: delay in milliseconds
*
* Set the bridge forward delay
*
* Returns 0 in case of success or -1 on failure
*/
int virNetDevBridgeSetSTPDelay(const char *brname,
int delay)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
ret = virNetDevBridgeSet(brname, "forward_delay", MS_TO_JIFFIES(delay),
fd, &ifr);
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
/**
* virNetDevBridgeGetSTPDelay:
* @brname: the bridge device name
* @delayms: the forward delay in milliseconds
*
* Retrieves the forward delay for the bridge device @brname
* storing it in @delayms. The forward delay is only meaningful
* if STP is enabled
*
* Returns 0 on success, -1 on error+
*/
int virNetDevBridgeGetSTPDelay(const char *brname,
int *delayms)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
unsigned long val;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
ret = virNetDevBridgeGet(brname, "forward_delay", &val,
fd, &ifr);
*delayms = JIFFIES_TO_MS(val);
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
/**
* virNetDevBridgeSetSTP:
* @brname: the bridge name
* @enable: 1 to enable, 0 to disable
*
* Control whether the bridge participates in the spanning tree protocol,
* in general don't disable it without good reasons.
*
* Returns 0 in case of success or -1 on failure
*/
int virNetDevBridgeSetSTP(const char *brname,
bool enable)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
ret = virNetDevBridgeSet(brname, "stp_state", enable ? 1 : 0,
fd, &ifr);
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
/**
* virNetDevBridgeGetSTP:
* @brname: the bridge device name
* @enabled: returns the STP state
*
* Determine the state of the spanning tree protocol on
* the device @brname, returning the state in @enabled
*
* Returns 0 on success, -1 on error
*/
int virNetDevBridgeGetSTP(const char *brname,
bool *enabled)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
unsigned long val;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
ret = virNetDevBridgeGet(brname, "stp_state", &val,
fd, &ifr);
*enabled = val ? true : false;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#elif defined(HAVE_BSD_BRIDGE_MGMT)
int virNetDevBridgeSetSTPDelay(const char *brname,
int delay)
{
struct ifbrparam param;
u_long delay_seconds = delay / 1000;
/* FreeBSD doesn't allow setting STP delay < 4 */
delay_seconds = delay_seconds < 4 ? 4 : delay_seconds;
param.ifbrp_fwddelay = delay_seconds & 0xff;
if (virNetDevBridgeCmd(brname, BRDGSFD, &param, sizeof(param)) < 0) {
virReportSystemError(errno,
_("Unable to set STP delay on %s"), brname);
return -1;
}
return 0;
}
int virNetDevBridgeGetSTPDelay(const char *brname,
int *delay ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to get STP delay on %s on this platform"),
brname);
return -1;
}
int virNetDevBridgeSetSTP(const char *brname ATTRIBUTE_UNUSED,
bool enable ATTRIBUTE_UNUSED)
{
/* FreeBSD doesn't allow to set STP per bridge,
* only per-device in bridge */
return 0;
}
int virNetDevBridgeGetSTP(const char *brname,
bool *enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to get STP on %s on this platform"),
brname);
return -1;
}
#else
int virNetDevBridgeSetSTPDelay(const char *brname,
int delay ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to set STP delay on %s on this platform"),
brname);
return -1;
}
int virNetDevBridgeGetSTPDelay(const char *brname,
int *delay ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to get STP delay on %s on this platform"),
brname);
return -1;
}
int virNetDevBridgeSetSTP(const char *brname,
bool enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to set STP on %s on this platform"),
brname);
return -1;
}
int virNetDevBridgeGetSTP(const char *brname,
bool *enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to get STP on %s on this platform"),
brname);
return -1;
}
#endif
#if defined(HAVE_STRUCT_IFREQ) && defined(__linux__)
/**
* virNetDevBridgeGetVlanFiltering:
* @brname: the bridge device name
* @enable: true or false
*
* Retrieves the vlan_filtering setting for the bridge device @brname
* storing it in @enable.
*
* Returns 0 on success, -1 on error
*/
int
virNetDevBridgeGetVlanFiltering(const char *brname,
bool *enable)
{
int ret = -1;
unsigned long value;
if (virNetDevBridgeGet(brname, "vlan_filtering", &value, -1, NULL) < 0)
goto cleanup;
*enable = !!value;
ret = 0;
cleanup:
return ret;
}
/**
* virNetDevBridgeSetVlanFiltering:
* @brname: the bridge name
* @enable: true or false
*
* Set the bridge vlan_filtering mode
*
* Returns 0 in case of success or -1 on failure
*/
int
virNetDevBridgeSetVlanFiltering(const char *brname,
bool enable)
{
return virNetDevBridgeSet(brname, "vlan_filtering", enable ? 1 : 0, -1, NULL);
}
#else
int
virNetDevBridgeGetVlanFiltering(const char *brname ATTRIBUTE_UNUSED,
bool *enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to get bridge vlan_filtering on this platform"));
return -1;
}
int
virNetDevBridgeSetVlanFiltering(const char *brname ATTRIBUTE_UNUSED,
bool enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to set bridge vlan_filtering on this platform"));
return -1;
}
#endif
#if defined(__linux__) && defined(HAVE_LIBNL)
# ifndef NTF_SELF
# define NTF_SELF 0x02
# endif
# ifndef NTF_MASTER
# define NTF_MASTER 0x04
# endif
/* virNetDevBridgeFDBAddDel:
* @mac: the MAC address being added to the table
* @ifname: name of the port (interface) of the bridge that wants this MAC
* @flags: any of virNetDevBridgeFDBFlags ORed together.
* @isAdd: true if adding the entry, fals if deleting
*
* Use netlink RTM_NEWNEIGH and RTM_DELNEIGH messages to add and
* delete entries from a bridge's fdb. The bridge itself is not
* referenced in the arguments to the function, only the name of the
* device that is attached to the bridge (since a device can only be
* attached to one bridge at a time, and must be attached for this
* function to make sense, the kernel easily infers which bridge's fdb
* is being modified by looking at the device name/index).
*
* Attempting to add an existing entry, or delete a non-existing entry
* *is* an error.
*
* returns 0 on success, -1 on failure.
*/
static int
virNetDevBridgeFDBAddDel(const virMacAddr *mac, const char *ifname,
unsigned int flags, bool isAdd)
{
int ret = -1;
struct nlmsghdr *resp = NULL;
struct nlmsgerr *err;
unsigned int recvbuflen;
struct nl_msg *nl_msg;
struct ndmsg ndm = { .ndm_family = PF_BRIDGE, .ndm_state = NUD_NOARP };
if (virNetDevGetIndex(ifname, &ndm.ndm_ifindex) < 0)
return -1;
if (flags & VIR_NETDEVBRIDGE_FDB_FLAG_ROUTER)
ndm.ndm_flags |= NTF_ROUTER;
if (flags & VIR_NETDEVBRIDGE_FDB_FLAG_SELF)
ndm.ndm_flags |= NTF_SELF;
if (flags & VIR_NETDEVBRIDGE_FDB_FLAG_MASTER)
ndm.ndm_flags |= NTF_MASTER;
/* default self (same as iproute2's bridge command */
if (!(ndm.ndm_flags & (NTF_MASTER | NTF_SELF)))
ndm.ndm_flags |= NTF_SELF;
if (flags & VIR_NETDEVBRIDGE_FDB_FLAG_PERMANENT)
ndm.ndm_state |= NUD_PERMANENT;
if (flags & VIR_NETDEVBRIDGE_FDB_FLAG_TEMP)
ndm.ndm_state |= NUD_REACHABLE;
/* default permanent, same as iproute2's bridge command */
if (!(ndm.ndm_state & (NUD_PERMANENT | NUD_REACHABLE)))
ndm.ndm_state |= NUD_PERMANENT;
nl_msg = nlmsg_alloc_simple(isAdd ? RTM_NEWNEIGH : RTM_DELNEIGH,
NLM_F_REQUEST |
(isAdd ? (NLM_F_CREATE | NLM_F_EXCL) : 0));
if (!nl_msg) {
virReportOOMError();
return -1;
}
if (nlmsg_append(nl_msg, &ndm, sizeof(ndm), NLMSG_ALIGNTO) < 0)
goto buffer_too_small;
if (nla_put(nl_msg, NDA_LLADDR, VIR_MAC_BUFLEN, mac) < 0)
goto buffer_too_small;
/* NB: this message can also accept a Destination IP, a port, a
* vlan tag, and a via (see iproute2/bridge/fdb.c:fdb_modify()),
* but those aren't required for our application
*/
if (virNetlinkCommand(nl_msg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0) {
goto cleanup;
}
if (recvbuflen < NLMSG_LENGTH(0) || resp == NULL)
goto malformed_resp;
switch (resp->nlmsg_type) {
case NLMSG_ERROR:
err = (struct nlmsgerr *)NLMSG_DATA(resp);
if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
goto malformed_resp;
if (err->error) {
virReportSystemError(-err->error,
_("error adding fdb entry for %s"), ifname);
goto cleanup;
}
break;
case NLMSG_DONE:
break;
default:
goto malformed_resp;
}
ret = 0;
cleanup:
nlmsg_free(nl_msg);
VIR_FREE(resp);
return ret;
malformed_resp:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("malformed netlink response message"));
goto cleanup;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
goto cleanup;
}
#else
static int
virNetDevBridgeFDBAddDel(const virMacAddr *mac ATTRIBUTE_UNUSED,
const char *ifname ATTRIBUTE_UNUSED,
unsigned int fdbFlags ATTRIBUTE_UNUSED,
bool isAdd ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to add/delete fdb entries on this platform"));
return -1;
}
#endif
int
virNetDevBridgeFDBAdd(const virMacAddr *mac, const char *ifname,
unsigned int flags)
{
return virNetDevBridgeFDBAddDel(mac, ifname, flags, true);
}
int
virNetDevBridgeFDBDel(const virMacAddr *mac, const char *ifname,
unsigned int flags)
{
return virNetDevBridgeFDBAddDel(mac, ifname, flags, false);
}
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