[libvirt] [PATCH 07/33] Remove usage of brctl command line tool
Daniel P. Berrange
berrange at redhat.com
Thu Nov 3 17:30:03 UTC 2011
From: "Daniel P. Berrange" <berrange at redhat.com>
Convert the virNetDevBridgeSetSTP and virNetDevBridgeSetSTPDelay
to use ioctls instead of spawning brctl.
Implement the virNetDevBridgeGetSTP and virNetDevBridgeGetSTPDelay
methods which were declared in the header but never existed
* src/util/bridge.c: Convert to use bridge ioctls instead of brctl
---
configure.ac | 2 -
libvirt.spec.in | 2 -
src/util/bridge.c | 199 +++++++++++++++++++++++++++++++++++++++++++++++++----
3 files changed, 184 insertions(+), 19 deletions(-)
diff --git a/configure.ac b/configure.ac
index 5753c08..0ce020d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -197,8 +197,6 @@ AC_DEFINE_UNQUOTED([DNSMASQ],["$DNSMASQ"],
[Location or name of the dnsmasq program])
AC_DEFINE_UNQUOTED([RADVD],["$RADVD"],
[Location or name of the radvd program])
-AC_DEFINE_UNQUOTED([BRCTL],["$BRCTL"],
- [Location or name of the brctl program (see bridge-utils)])
AC_DEFINE_UNQUOTED([TC],["$TC"],
[Location or name of the tc profram (see iproute2)])
if test -n "$UDEVADM"; then
diff --git a/libvirt.spec.in b/libvirt.spec.in
index 261f34c..eda0bcc 100644
--- a/libvirt.spec.in
+++ b/libvirt.spec.in
@@ -251,7 +251,6 @@ Requires: %{name}-client = %{version}-%{release}
# Used by many of the drivers, so turn it on whenever the
# daemon is present
%if %{with_libvirtd}
-Requires: bridge-utils
# for modprobe of pci devices
Requires: module-init-tools
# for /sbin/ip & /sbin/tc
@@ -380,7 +379,6 @@ BuildRequires: radvd
%if %{with_nwfilter}
BuildRequires: ebtables
%endif
-BuildRequires: bridge-utils
BuildRequires: module-init-tools
%if %{with_sasl}
BuildRequires: cyrus-sasl-devel
diff --git a/src/util/bridge.c b/src/util/bridge.c
index 3a7012c..0265e81 100644
--- a/src/util/bridge.c
+++ b/src/util/bridge.c
@@ -52,6 +52,7 @@
# include "logging.h"
# include "network.h"
# include "virterror_internal.h"
+# include "intprops.h"
# define JIFFIES_TO_MS(j) (((j)*1000)/HZ)
# define MS_TO_JIFFIES(ms) (((ms)*HZ)/1000)
@@ -99,6 +100,112 @@ static int virNetDevSetupControl(const char *ifname,
return virNetDevSetupControlFull(ifname, ifr, AF_PACKET, SOCK_DGRAM);
}
+# define SYSFS_NET_DIR "/sys/class/net"
+/*
+ * 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, "%s/%s/bridge/%s", SYSFS_NET_DIR, brname, paramname) < 0) {
+ virReportOOMError();
+ 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, "%s/%s/bridge/%s", SYSFS_NET_DIR, brname, paramname) < 0) {
+ virReportOOMError();
+ 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);
+ }
+ } 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;
+}
+
/**
* virNetDevBridgeCreate:
@@ -817,22 +924,54 @@ cleanup:
int virNetDevBridgeSetSTPDelay(const char *brname,
int delay)
{
- virCommandPtr cmd;
+ int fd = -1;
int ret = -1;
+ struct ifreq ifr;
+
+ if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
+ goto cleanup;
- cmd = virCommandNew(BRCTL);
- virCommandAddArgList(cmd, "setfd", brname, NULL);
- virCommandAddArgFormat(cmd, "%d", delay);
+ ret = virNetDevBridgeSet(brname, "stp_state", MS_TO_JIFFIES(delay),
+ fd, &ifr);
- if (virCommandRun(cmd, NULL) < 0)
+cleanup:
+ VIR_FORCE_CLOSE(fd);
+ return ret;
+}
+
+
+/**
+ * virNetDevBridgeGetSTPDelay:
+ * @brname: the bridge device name
+ * @delayms: the forward delay in milliseconds
+ *
+ * Retrives 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 i;
+
+ if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
- ret = 0;
+ ret = virNetDevBridgeGet(brname, "stp_state", &i,
+ fd, &ifr);
+ *delayms = JIFFIES_TO_MS(i);
+
cleanup:
- virCommandFree(cmd);
+ VIR_FORCE_CLOSE(fd);
return ret;
}
+
/**
* virNetDevBridgeSetSTP:
* @brname: the bridge name
@@ -846,23 +985,53 @@ cleanup:
int virNetDevBridgeSetSTP(const char *brname,
bool enable)
{
- virCommandPtr cmd;
+ int fd = -1;
int ret = -1;
+ struct ifreq ifr;
- cmd = virCommandNew(BRCTL);
- virCommandAddArgList(cmd, "stp", brname,
- enable ? "on" : "off",
- NULL);
+ if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
+ goto cleanup;
- if (virCommandRun(cmd, NULL) < 0)
+ 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 i;
+
+ if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
- ret = 0;
+ ret = virNetDevBridgeGet(brname, "stp_state", &i,
+ fd, &ifr);
+ *enabled = i ? true : false;
+
cleanup:
- virCommandFree(cmd);
+ VIR_FORCE_CLOSE(fd);
return ret;
}
+
/**
* brCreateTap:
* @ifname: the interface name
--
1.7.6.4
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