[libvirt] PATCH 1/4: More generic MAC address handling
Daniel P. Berrange
berrange at redhat.com
Tue Oct 14 15:17:57 UTC 2008
This patch improves the MAC address handling.
Currently our XML parser auto-generates a MAC addres using the KVM vendor
prefix. This isn't much use for other drivers. This patch addresses this:
- Stores each driver's vendor prefix in the capability object
- Changes domain parser to use the per-driver vendor prefix for
generating mac addresses
- Adds more utility methods to util.c for parsing/generating/formatting
MAC addresses
- Updates each driver to record its vendor prefix for MAC address.
NB, for LXC driver we're 'borrowing' KVM's vendor prefix.
capabilities.c | 16 +++++++++++++++-
capabilities.h | 11 +++++++++++
domain_conf.c | 34 +++++++---------------------------
domain_conf.h | 8 ++------
lxc_conf.c | 3 +++
lxc_driver.c | 4 +++-
openvz_conf.c | 2 +-
qemu_conf.c | 3 +++
qemu_driver.c | 6 ++++--
util.c | 24 +++++++++++++++++++++++-
util.h | 12 +++++++++++-
xen_internal.c | 3 +++
xend_internal.c | 8 ++++++--
xm_internal.c | 34 +++++++++++-----------------------
14 files changed, 103 insertions(+), 65 deletions(-)
Daniel
diff -r c928fca9ce2b src/capabilities.c
--- a/src/capabilities.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/capabilities.c Tue Oct 14 12:24:44 2008 +0100
@@ -26,7 +26,7 @@
#include "capabilities.h"
#include "buf.h"
#include "memory.h"
-
+#include "util.h"
/**
* virCapabilitiesNew:
@@ -647,3 +647,17 @@ virCapabilitiesFormatXML(virCapsPtr caps
return virBufferContentAndReset(&xml);
}
+
+extern void
+virCapabilitiesSetMacPrefix(virCapsPtr caps,
+ unsigned char *prefix)
+{
+ memcpy(caps->macPrefix, prefix, sizeof(caps->macPrefix));
+}
+
+extern void
+virCapabilitiesGenerateMac(virCapsPtr caps,
+ unsigned char *mac)
+{
+ virGenerateMacAddr(caps->macPrefix, mac);
+}
diff -r c928fca9ce2b src/capabilities.h
--- a/src/capabilities.h Tue Oct 14 11:16:52 2008 +0100
+++ b/src/capabilities.h Tue Oct 14 12:24:13 2008 +0100
@@ -23,6 +23,9 @@
#ifndef __VIR_CAPABILITIES_H
#define __VIR_CAPABILITIES_H
+
+#include "internal.h"
+#include "util.h"
typedef struct _virCapsGuestFeature virCapsGuestFeature;
typedef virCapsGuestFeature *virCapsGuestFeaturePtr;
@@ -95,6 +98,7 @@ struct _virCaps {
virCapsHost host;
int nguests;
virCapsGuestPtr *guests;
+ unsigned char macPrefix[VIR_MAC_PREFIX_BUFLEN];
};
@@ -106,6 +110,13 @@ extern void
extern void
virCapabilitiesFree(virCapsPtr caps);
+extern void
+virCapabilitiesSetMacPrefix(virCapsPtr caps,
+ unsigned char *prefix);
+
+extern void
+virCapabilitiesGenerateMac(virCapsPtr caps,
+ unsigned char *mac);
extern int
virCapabilitiesAddHostFeature(virCapsPtr caps,
diff -r c928fca9ce2b src/domain_conf.c
--- a/src/domain_conf.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/domain_conf.c Tue Oct 14 12:26:36 2008 +0100
@@ -762,23 +762,14 @@ cleanup:
}
-static void virDomainNetRandomMAC(virDomainNetDefPtr def) {
- /* XXX there different vendor prefixes per hypervisor */
- def->mac[0] = 0x52;
- def->mac[1] = 0x54;
- def->mac[2] = 0x00;
- def->mac[3] = 1 + (int)(256*(rand()/(RAND_MAX+1.0)));
- def->mac[4] = 1 + (int)(256*(rand()/(RAND_MAX+1.0)));
- def->mac[5] = 1 + (int)(256*(rand()/(RAND_MAX+1.0)));
-}
-
/* Parse the XML definition for a network interface
* @param node XML nodeset to parse for net definition
* @return 0 on success, -1 on failure
*/
-virDomainNetDefPtr
+static virDomainNetDefPtr
virDomainNetDefParseXML(virConnectPtr conn,
+ virCapsPtr caps,
xmlNodePtr node) {
virDomainNetDefPtr def;
xmlNodePtr cur;
@@ -857,22 +848,9 @@ virDomainNetDefParseXML(virConnectPtr co
}
if (macaddr) {
- unsigned int mac[6];
- sscanf((const char *)macaddr, "%02x:%02x:%02x:%02x:%02x:%02x",
- (unsigned int*)&mac[0],
- (unsigned int*)&mac[1],
- (unsigned int*)&mac[2],
- (unsigned int*)&mac[3],
- (unsigned int*)&mac[4],
- (unsigned int*)&mac[5]);
- def->mac[0] = mac[0];
- def->mac[1] = mac[1];
- def->mac[2] = mac[2];
- def->mac[3] = mac[3];
- def->mac[4] = mac[4];
- def->mac[5] = mac[5];
+ virParseMacAddr((const char *)macaddr, def->mac);
} else {
- virDomainNetRandomMAC(def);
+ virCapabilitiesGenerateMac(caps, def->mac);
}
switch (def->type) {
@@ -1630,6 +1608,7 @@ static int virDomainLifecycleParseXML(vi
virDomainDeviceDefPtr virDomainDeviceDefParse(virConnectPtr conn,
+ virCapsPtr caps,
const virDomainDefPtr def,
const char *xmlStr)
{
@@ -1666,7 +1645,7 @@ virDomainDeviceDefPtr virDomainDeviceDef
goto error;
} else if (xmlStrEqual(node->name, BAD_CAST "interface")) {
dev->type = VIR_DOMAIN_DEVICE_NET;
- if (!(dev->data.net = virDomainNetDefParseXML(conn, node)))
+ if (!(dev->data.net = virDomainNetDefParseXML(conn, caps, node)))
goto error;
} else if (xmlStrEqual(node->name, BAD_CAST "input")) {
dev->type = VIR_DOMAIN_DEVICE_INPUT;
@@ -1988,6 +1967,7 @@ static virDomainDefPtr virDomainDefParse
goto no_memory;
for (i = 0 ; i < n ; i++) {
virDomainNetDefPtr net = virDomainNetDefParseXML(conn,
+ caps,
nodes[i]);
if (!net)
goto error;
diff -r c928fca9ce2b src/domain_conf.h
--- a/src/domain_conf.h Tue Oct 14 11:16:52 2008 +0100
+++ b/src/domain_conf.h Tue Oct 14 12:26:56 2008 +0100
@@ -127,14 +127,12 @@ enum virDomainNetType {
};
-#define VIR_DOMAIN_NET_MAC_SIZE 6
-
/* Stores the virtual network interface configuration */
typedef struct _virDomainNetDef virDomainNetDef;
typedef virDomainNetDef *virDomainNetDefPtr;
struct _virDomainNetDef {
int type;
- unsigned char mac[VIR_DOMAIN_NET_MAC_SIZE];
+ unsigned char mac[VIR_MAC_BUFLEN];
char *model;
union {
struct {
@@ -513,6 +511,7 @@ void virDomainRemoveInactive(virDomainOb
#ifndef PROXY
virDomainDeviceDefPtr virDomainDeviceDefParse(virConnectPtr conn,
+ virCapsPtr caps,
const virDomainDefPtr def,
const char *xmlStr);
virDomainDefPtr virDomainDefParseString(virConnectPtr conn,
@@ -573,9 +572,6 @@ int virDiskNameToBusDeviceIndex(virDomai
int *busIdx,
int *devIdx);
-virDomainNetDefPtr virDomainNetDefParseXML(virConnectPtr conn,
- xmlNodePtr node);
-
const char *virDomainDefDefaultEmulator(virConnectPtr conn,
virDomainDefPtr def,
virCapsPtr caps);
diff -r c928fca9ce2b src/lxc_conf.c
--- a/src/lxc_conf.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/lxc_conf.c Tue Oct 14 12:33:39 2008 +0100
@@ -42,6 +42,9 @@ virCapsPtr lxcCapsInit(void)
0, 0)) == NULL)
goto no_memory;
+ /* XXX shouldn't 'borrow' KVM's prefix */
+ virCapabilitiesSetMacPrefix(caps, (unsigned char []){ 0x52, 0x54, 0x00 });
+
if ((guest = virCapabilitiesAddGuest(caps,
"exe",
utsname.machine,
diff -r c928fca9ce2b src/lxc_driver.c
--- a/src/lxc_driver.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/lxc_driver.c Tue Oct 14 12:34:45 2008 +0100
@@ -1187,6 +1187,7 @@ static int lxcGetSchedulerParameters(vir
int rc = 0;
virCgroupPtr group;
virDomainObjPtr domain;
+ unsigned long val;
if (virCgroupHaveSupport() != 0)
return 0;
@@ -1208,7 +1209,8 @@ static int lxcGetSchedulerParameters(vir
if (rc != 0)
return rc;
- rc = virCgroupGetCpuShares(group, (unsigned long *)¶ms[0].value.ul);
+ rc = virCgroupGetCpuShares(group, &val);
+ params[0].value.ul = val;
strncpy(params[0].field, "cpu_shares", sizeof(params[0].field));
params[0].type = VIR_DOMAIN_SCHED_FIELD_ULLONG;
diff -r c928fca9ce2b src/openvz_conf.c
--- a/src/openvz_conf.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/openvz_conf.c Tue Oct 14 14:41:29 2008 +0100
@@ -108,7 +108,7 @@ int openvzCheckEmptyMac(const unsigned c
int openvzCheckEmptyMac(const unsigned char *mac)
{
int i;
- for (i = 0; i < VIR_DOMAIN_NET_MAC_SIZE; i++)
+ for (i = 0; i < VIR_MAC_BUFLEN; i++)
if (mac[i] != 0x00)
return 1;
diff -r c928fca9ce2b src/qemu_conf.c
--- a/src/qemu_conf.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/qemu_conf.c Tue Oct 14 12:32:22 2008 +0100
@@ -364,6 +364,9 @@ virCapsPtr qemudCapsInit(void) {
if ((caps = virCapabilitiesNew(utsname.machine,
0, 0)) == NULL)
goto no_memory;
+
+ /* Using KVM's mac prefix for QEMU too */
+ virCapabilitiesSetMacPrefix(caps, (unsigned char[]){ 0x52, 0x54, 0x00 });
if (qemudCapsInitNUMA(caps) < 0)
goto no_memory;
diff -r c928fca9ce2b src/qemu_driver.c
--- a/src/qemu_driver.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/qemu_driver.c Tue Oct 14 12:33:23 2008 +0100
@@ -2389,7 +2389,7 @@ static int qemudDomainChangeEjectableMed
{
struct qemud_driver *driver = (struct qemud_driver *)dom->conn->privateData;
virDomainObjPtr vm = virDomainFindByUUID(&driver->domains, dom->uuid);
- virDomainDiskDefPtr origdisk, newdisk;
+ virDomainDiskDefPtr origdisk = NULL, newdisk;
char *cmd, *reply, *safe_path;
char *devname = NULL;
unsigned int qemuCmdFlags;
@@ -2631,7 +2631,9 @@ static int qemudDomainAttachDevice(virDo
return -1;
}
- dev = virDomainDeviceDefParse(dom->conn, vm->def, xml);
+ dev = virDomainDeviceDefParse(dom->conn,
+ driver->caps,
+ vm->def, xml);
if (dev == NULL) {
return -1;
}
diff -r c928fca9ce2b src/util.c
--- a/src/util.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/util.c Tue Oct 14 12:23:15 2008 +0100
@@ -983,7 +983,7 @@ virParseMacAddr(const char* str, unsigne
int i;
errno = 0;
- for (i = 0; i < 6; i++) {
+ for (i = 0; i < VIR_MAC_BUFLEN; i++) {
char *end_ptr;
unsigned long result;
@@ -1012,6 +1012,28 @@ virParseMacAddr(const char* str, unsigne
return -1;
}
+
+void virFormatMacAddr(const unsigned char *addr,
+ char *str)
+{
+ snprintf(str, VIR_MAC_STRING_BUFLEN,
+ "%02X:%02X:%02X:%02X:%02X:%02X",
+ addr[0], addr[1], addr[2],
+ addr[3], addr[4], addr[5]);
+ str[VIR_MAC_STRING_BUFLEN-1] = '\0';
+}
+
+void virGenerateMacAddr(const unsigned char *prefix,
+ unsigned char *addr)
+{
+ addr[0] = prefix[0];
+ addr[1] = prefix[1];
+ addr[2] = prefix[2];
+ addr[3] = 1 + (int)(256*(rand()/(RAND_MAX+1.0)));
+ addr[4] = 1 + (int)(256*(rand()/(RAND_MAX+1.0)));
+ addr[5] = 1 + (int)(256*(rand()/(RAND_MAX+1.0)));
+}
+
int virEnumFromString(const char *const*types,
unsigned int ntypes,
diff -r c928fca9ce2b src/util.h
--- a/src/util.h Tue Oct 14 11:16:52 2008 +0100
+++ b/src/util.h Tue Oct 14 12:21:58 2008 +0100
@@ -1,3 +1,4 @@
+
/*
* utils.h: common, generic utility functions
*
@@ -113,7 +114,16 @@ void virSkipSpaces(const char **str);
void virSkipSpaces(const char **str);
int virParseNumber(const char **str);
-int virParseMacAddr(const char* str, unsigned char *addr);
+#define VIR_MAC_BUFLEN 6
+#define VIR_MAC_PREFIX_BUFLEN 3
+#define VIR_MAC_STRING_BUFLEN VIR_MAC_BUFLEN * 3
+
+int virParseMacAddr(const char* str,
+ unsigned char *addr);
+void virFormatMacAddr(const unsigned char *addr,
+ char *str);
+void virGenerateMacAddr(const unsigned char *prefix,
+ unsigned char *addr);
int virDiskNameToIndex(const char* str);
diff -r c928fca9ce2b src/xen_internal.c
--- a/src/xen_internal.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/xen_internal.c Tue Oct 14 12:27:38 2008 +0100
@@ -2132,6 +2132,9 @@ xenHypervisorBuildCapabilities(virConnec
if ((caps = virCapabilitiesNew(hostmachine, 1, 1)) == NULL)
goto no_memory;
+
+ virCapabilitiesSetMacPrefix(caps, (unsigned char[]){ 0x00, 0x16, 0x3e });
+
if (hvm_type && STRNEQ(hvm_type, "") &&
virCapabilitiesAddHostFeature(caps, hvm_type) < 0)
goto no_memory;
diff -r c928fca9ce2b src/xend_internal.c
--- a/src/xend_internal.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/xend_internal.c Tue Oct 14 12:29:07 2008 +0100
@@ -3852,7 +3852,9 @@ xenDaemonAttachDevice(virDomainPtr domai
NULL)))
goto cleanup;
- if (!(dev = virDomainDeviceDefParse(domain->conn, def, xml)))
+ if (!(dev = virDomainDeviceDefParse(domain->conn,
+ priv->caps,
+ def, xml)))
goto cleanup;
@@ -3940,7 +3942,9 @@ xenDaemonDetachDevice(virDomainPtr domai
NULL)))
goto cleanup;
- if (!(dev = virDomainDeviceDefParse(domain->conn, def, xml)))
+ if (!(dev = virDomainDeviceDefParse(domain->conn,
+ priv->caps,
+ def, xml)))
goto cleanup;
if (virDomainXMLDevID(domain, dev, class, ref, sizeof(ref)))
diff -r c928fca9ce2b src/xm_internal.c
--- a/src/xm_internal.c Tue Oct 14 11:16:52 2008 +0100
+++ b/src/xm_internal.c Tue Oct 14 12:30:37 2008 +0100
@@ -2422,12 +2422,16 @@ xenXMDomainAttachDevice(virDomainPtr dom
int ret = -1;
virDomainDeviceDefPtr dev = NULL;
virDomainDefPtr def;
+ xenUnifiedPrivatePtr priv;
if ((!domain) || (!domain->conn) || (!domain->name) || (!xml)) {
xenXMError((domain ? domain->conn : NULL), VIR_ERR_INVALID_ARG,
__FUNCTION__);
return -1;
}
+
+ priv = (xenUnifiedPrivatePtr) domain->conn->privateData;
+
if (domain->conn->flags & VIR_CONNECT_RO)
return -1;
if (domain->id != -1)
@@ -2440,6 +2444,7 @@ xenXMDomainAttachDevice(virDomainPtr dom
def = entry->def;
if (!(dev = virDomainDeviceDefParse(domain->conn,
+ priv->caps,
entry->def,
xml)))
return -1;
@@ -2489,28 +2494,6 @@ xenXMDomainAttachDevice(virDomainPtr dom
return ret;
}
-
-/**
- * xenXMAutoAssignMac:
- * @mac: pointer to Mac String
- *
- * a mac is assigned automatically.
- *
- * Returns 0 in case of success, -1 in case of failure.
- */
-char *
-xenXMAutoAssignMac() {
- char *buf;
-
- if (VIR_ALLOC_N(buf, 18) < 0)
- return 0;
- srand((unsigned)time(NULL));
- sprintf(buf, "00:16:3e:%02x:%02x:%02x"
- ,1 + (int)(256*(rand()/(RAND_MAX+1.0)))
- ,1 + (int)(256*(rand()/(RAND_MAX+1.0)))
- ,1 + (int)(256*(rand()/(RAND_MAX+1.0))));
- return buf;
-}
/**
* xenXMDomainDetachDevice:
@@ -2529,12 +2512,16 @@ xenXMDomainDetachDevice(virDomainPtr dom
virDomainDefPtr def;
int ret = -1;
int i;
+ xenUnifiedPrivatePtr priv;
if ((!domain) || (!domain->conn) || (!domain->name) || (!xml)) {
xenXMError((domain ? domain->conn : NULL), VIR_ERR_INVALID_ARG,
__FUNCTION__);
return -1;
}
+
+ priv = (xenUnifiedPrivatePtr) domain->conn->privateData;
+
if (domain->conn->flags & VIR_CONNECT_RO)
return -1;
if (domain->id != -1)
@@ -2546,6 +2533,7 @@ xenXMDomainDetachDevice(virDomainPtr dom
def = entry->def;
if (!(dev = virDomainDeviceDefParse(domain->conn,
+ priv->caps,
entry->def,
xml)))
return -1;
@@ -2573,7 +2561,7 @@ xenXMDomainDetachDevice(virDomainPtr dom
for (i = 0 ; i < def->nnets ; i++) {
if (!memcmp(def->nets[i]->mac,
dev->data.net->mac,
- VIR_DOMAIN_NET_MAC_SIZE)) {
+ sizeof(def->nets[i]->mac))) {
virDomainNetDefFree(def->nets[i]);
if (i < (def->nnets - 1))
memmove(def->nets + i,
--
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|: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :|
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