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[libvirt] [PATCH 1/2] nwfilter: move code for IP address map into separate file



The goal of this patch is to prepare for support for multiple IP
addresses per interface in the DHCP snooping code.

Move the code for the IP address map that maps interface names to
IP addresses into their own file. Rename the functions on the way
but otherwise leave the code as-is. Initialize this new layer
separately before dependent layers (iplearning, dhcpsnooping)
and shut it down after them.

---
 src/Makefile.am                        |    2
 src/nwfilter/nwfilter_driver.c         |   11 +-
 src/nwfilter/nwfilter_gentech_driver.c |    5
src/nwfilter/nwfilter_ipaddrmap.c | 167 +++++++++++++++++++++++++++++++++
 src/nwfilter/nwfilter_ipaddrmap.h      |   38 +++++++
 src/nwfilter/nwfilter_learnipaddr.c    |  127 -------------------------
 src/nwfilter/nwfilter_learnipaddr.h    |    3
 7 files changed, 222 insertions(+), 131 deletions(-)

Index: libvirt-acl/src/nwfilter/nwfilter_ipaddrmap.h
===================================================================
--- /dev/null
+++ libvirt-acl/src/nwfilter/nwfilter_ipaddrmap.h
@@ -0,0 +1,38 @@
+/*
+ * nwfilter_ipaddrmap.h: IP address map for mapping interfaces to their
+ *                       detected/expected IP addresses
+ *
+ * Copyright (C) 2010, 2012 IBM Corp.
+ *
+ * Author:
+ *     Stefan Berger <stefanb linux vnet ibm com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ */
+
+#ifndef __VIR_NWFILTER_IPADDRMAP_H
+# define __VIR_NWFILTER_IPADDRMAP_H
+
+int virNWFilterIPAddrMapInit(void);
+void virNWFilterIPAddrMapShutdown(void);
+
+int virNWFilterIPAddrMapAddIPAddrForIfname(const char *ifname, char *addr);
+int virNWFilterIPAddrMapDelIPAddrForIfname(const char *ifname,
+                                           const char *ipaddr);
+virNWFilterVarValuePtr virNWFilterIPAddrMapGetIPAddrForIfname(
+                                           const char *ifname);
+
+#endif /* __VIR_NWFILTER_IPADDRMAP_H */
Index: libvirt-acl/src/Makefile.am
===================================================================
--- libvirt-acl.orig/src/Makefile.am
+++ libvirt-acl/src/Makefile.am
@@ -513,6 +513,8 @@ NWFILTER_DRIVER_SOURCES =                    \
         nwfilter/nwfilter_dhcpsnoop.h                \
         nwfilter/nwfilter_ebiptables_driver.c            \
         nwfilter/nwfilter_ebiptables_driver.h            \
+        nwfilter/nwfilter_ipaddrmap.c                \
+        nwfilter/nwfilter_ipaddrmap.h                \
         nwfilter/nwfilter_learnipaddr.c                \
         nwfilter/nwfilter_learnipaddr.h

Index: libvirt-acl/src/nwfilter/nwfilter_driver.c
===================================================================
--- libvirt-acl.orig/src/nwfilter/nwfilter_driver.c
+++ libvirt-acl/src/nwfilter/nwfilter_driver.c
@@ -39,6 +39,7 @@
 #include "nwfilter_gentech_driver.h"
 #include "configmake.h"

+#include "nwfilter_ipaddrmap.h"
 #include "nwfilter_dhcpsnoop.h"
 #include "nwfilter_learnipaddr.h"

@@ -67,10 +68,12 @@ static int
 nwfilterDriverStartup(int privileged) {
     char *base = NULL;

-    if (virNWFilterDHCPSnoopInit() < 0)
+    if (virNWFilterIPAddrMapInit() < 0)
         return -1;
     if (virNWFilterLearnInit() < 0)
-        return -1;
+        goto err_exit_ipaddrmapshutdown;
+    if (virNWFilterDHCPSnoopInit() < 0)
+        goto err_exit_learnshutdown;

     virNWFilterTechDriversInit(privileged);

@@ -131,7 +134,10 @@ alloc_err_exit:
 conf_init_err:
     virNWFilterTechDriversShutdown();
     virNWFilterDHCPSnoopShutdown();
+err_exit_learnshutdown:
     virNWFilterLearnShutdown();
+err_exit_ipaddrmapshutdown:
+    virNWFilterIPAddrMapShutdown();

     return -1;
 }
@@ -210,6 +216,7 @@ nwfilterDriverShutdown(void) {
     virNWFilterTechDriversShutdown();
     virNWFilterDHCPSnoopShutdown();
     virNWFilterLearnShutdown();
+    virNWFilterIPAddrMapShutdown();

     nwfilterDriverLock(driverState);

Index: libvirt-acl/src/nwfilter/nwfilter_gentech_driver.c
===================================================================
--- libvirt-acl.orig/src/nwfilter/nwfilter_gentech_driver.c
+++ libvirt-acl/src/nwfilter/nwfilter_gentech_driver.c
@@ -33,6 +33,7 @@
 #include "nwfilter_gentech_driver.h"
 #include "nwfilter_ebiptables_driver.h"
 #include "nwfilter_dhcpsnoop.h"
+#include "nwfilter_ipaddrmap.h"
 #include "nwfilter_learnipaddr.h"
 #include "virnetdev.h"
 #include "datatypes.h"
@@ -870,7 +871,7 @@ __virNWFilterInstantiateFilter(const uns
         goto err_exit;
     }

-    ipaddr = virNWFilterGetIpAddrForIfname(ifname);
+    ipaddr = virNWFilterIPAddrMapGetIPAddrForIfname(ifname);

     vars1 = virNWFilterCreateVarHashmap(str_macaddr, ipaddr);
     if (!vars1) {
@@ -1132,7 +1133,7 @@ _virNWFilterTeardownFilter(const char *i

     techdriver->allTeardown(ifname);

-    virNWFilterDelIpAddrForIfname(ifname, NULL);
+    virNWFilterIPAddrMapDelIPAddrForIfname(ifname, NULL);

     virNWFilterUnlockIface(ifname);

Index: libvirt-acl/src/nwfilter/nwfilter_ipaddrmap.c
===================================================================
--- /dev/null
+++ libvirt-acl/src/nwfilter/nwfilter_ipaddrmap.c
@@ -0,0 +1,167 @@
+/*
+ * nwfilter_ipaddrmap.c: IP address map for mapping interfaces to their
+ *                       detected/expected IP addresses
+ *
+ * Copyright (C) 2010, 2012 IBM Corp.
+ *
+ * Author:
+ *     Stefan Berger <stefanb linux vnet ibm com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ */
+
+#include <config.h>
+
+#include "internal.h"
+
+#include "virterror_internal.h"
+#include "datatypes.h"
+#include "nwfilter_params.h"
+#include "nwfilter_ipaddrmap.h"
+
+#define VIR_FROM_THIS VIR_FROM_NWFILTER
+
+static virMutex ipAddressMapLock;
+static virNWFilterHashTablePtr ipAddressMap;
+
+
+/* Add an IP address to the list of IP addresses an interface is
+ * known to use. This function feeds the per-interface cache that
+ * is used to instantiate filters with variable '$IP'.
+ *
+ * @ifname: The name of the (tap) interface
+ * @addr: An IPv4 address in dotted decimal format that the (tap)
+ *        interface is known to use.
+ *
+ * This function returns 0 on success, -1 otherwise
+ */
+int
+virNWFilterIPAddrMapAddIPAddrForIfname(const char *ifname, char *addr)
+{
+    int ret = -1;
+    virNWFilterVarValuePtr val;
+
+    virMutexLock(&ipAddressMapLock);
+
+    val = virHashLookup(ipAddressMap->hashTable, ifname);
+    if (!val) {
+        val = virNWFilterVarValueCreateSimple(addr);
+        if (!val) {
+            virReportOOMError();
+            goto cleanup;
+        }
+        ret = virNWFilterHashTablePut(ipAddressMap, ifname, val, 1);
+        goto cleanup;
+    } else {
+        if (virNWFilterVarValueAddValue(val, addr) < 0)
+            goto cleanup;
+    }
+
+    ret = 0;
+
+cleanup:
+    virMutexUnlock(&ipAddressMapLock);
+
+    return ret;
+}
+
+/* Delete all or a specific IP address from an interface. After this
+ * call either all or the given IP address will not be associated
+ * with the interface anymore.
+ *
+ * @ifname: The name of the (tap) interface
+ * @addr: An IPv4 address in dotted decimal format that the (tap)
+ *        interface is not using anymore; provide NULL to remove all IP
+ *        addresses associated with the given interface
+ *
+ * This function returns the number of IP addresses that are still
+ * known to be associated with this interface, in case of an error
+ * -1 is returned. Error conditions are:
+ * - IP addresses is not known to be associated with the interface
+ */
+int
+virNWFilterIPAddrMapDelIPAddrForIfname(const char *ifname, const char *ipaddr)
+{
+    int ret = -1;
+    virNWFilterVarValuePtr val = NULL;
+
+    virMutexLock(&ipAddressMapLock);
+
+    if (ipaddr != NULL) {
+        val = virHashLookup(ipAddressMap->hashTable, ifname);
+        if (val) {
+            if (virNWFilterVarValueGetCardinality(val) == 1 &&
+                STREQ(ipaddr,
+                      virNWFilterVarValueGetNthValue(val, 0)))
+                goto remove_entry;
+            virNWFilterVarValueDelValue(val, ipaddr);
+            ret = virNWFilterVarValueGetCardinality(val);
+        }
+    } else {
+remove_entry:
+        /* remove whole entry */
+        val = virNWFilterHashTableRemoveEntry(ipAddressMap, ifname);
+        virNWFilterVarValueFree(val);
+        ret = 0;
+    }
+
+    virMutexUnlock(&ipAddressMapLock);
+
+    return ret;
+}
+
+/* Get the list of IP addresses known to be in use by an interface
+ *
+ * This function returns NULL in case no IP address is known to be
+ * associated with the interface, a virNWFilterVarValuePtr otherwise
+ * that then can contain one or multiple entries.
+ */
+virNWFilterVarValuePtr
+virNWFilterIPAddrMapGetIPAddrForIfname(const char *ifname)
+{
+    virNWFilterVarValuePtr res;
+
+    virMutexLock(&ipAddressMapLock);
+
+    res = virHashLookup(ipAddressMap->hashTable, ifname);
+
+    virMutexUnlock(&ipAddressMapLock);
+
+    return res;
+}
+
+int
+virNWFilterIPAddrMapInit(void)
+{
+    ipAddressMap = virNWFilterHashTableCreate(0);
+    if (!ipAddressMap) {
+        virReportOOMError();
+        return -1;
+    }
+
+    if (virMutexInit(&ipAddressMapLock) < 0) {
+        virNWFilterIPAddrMapShutdown();
+        return -1;
+    }
+
+    return 0;
+}
+
+void
+virNWFilterIPAddrMapShutdown(void)
+{
+    virNWFilterHashTableFree(ipAddressMap);
+    ipAddressMap = NULL;
+}
Index: libvirt-acl/src/nwfilter/nwfilter_learnipaddr.c
===================================================================
--- libvirt-acl.orig/src/nwfilter/nwfilter_learnipaddr.c
+++ libvirt-acl/src/nwfilter/nwfilter_learnipaddr.c
@@ -52,6 +52,7 @@
 #include "conf/domain_conf.h"
 #include "nwfilter_gentech_driver.h"
 #include "nwfilter_ebiptables_driver.h"
+#include "nwfilter_ipaddrmap.h"
 #include "nwfilter_learnipaddr.h"

 #define VIR_FROM_THIS VIR_FROM_NWFILTER
@@ -118,9 +119,6 @@ struct ether_vlan_header
 static virMutex pendingLearnReqLock;
 static virHashTablePtr pendingLearnReq;

-static virMutex ipAddressMapLock;
-static virNWFilterHashTablePtr ipAddressMap;
-
 static virMutex ifaceMapLock;
 static virHashTablePtr ifaceLockMap;

@@ -310,113 +308,8 @@ virNWFilterDeregisterLearnReq(int ifinde
     return res;
 }

-/* Add an IP address to the list of IP addresses an interface is
- * known to use. This function feeds the per-interface cache that
- * is used to instantiate filters with variable '$IP'.
- *
- * @ifname: The name of the (tap) interface
- * @addr: An IPv4 address in dotted decimal format that the (tap)
- *        interface is known to use.
- *
- * This function returns 0 on success, -1 otherwise
- */
-static int
-virNWFilterAddIpAddrForIfname(const char *ifname, char *addr)
-{
-    int ret = -1;
-    virNWFilterVarValuePtr val;
-
-    virMutexLock(&ipAddressMapLock);
-
-    val = virHashLookup(ipAddressMap->hashTable, ifname);
-    if (!val) {
-        val = virNWFilterVarValueCreateSimple(addr);
-        if (!val) {
-            virReportOOMError();
-            goto cleanup;
-        }
-        ret = virNWFilterHashTablePut(ipAddressMap, ifname, val, 1);
-        goto cleanup;
-    } else {
-        if (virNWFilterVarValueAddValue(val, addr) < 0)
-            goto cleanup;
-    }
-
-    ret = 0;
-
-cleanup:
-    virMutexUnlock(&ipAddressMapLock);
-
-    return ret;
-}
 #endif

-/* Delete all or a specific IP address from an interface. After this
- * call either all or the given IP address will not be associated
- * with the interface anymore.
- *
- * @ifname: The name of the (tap) interface
- * @addr: An IPv4 address in dotted decimal format that the (tap)
- *        interface is not using anymore; provide NULL to remove all IP
- *        addresses associated with the given interface
- *
- * This function returns the number of IP addresses that are still
- * known to be associated with this interface, in case of an error
- * -1 is returned. Error conditions are:
- * - IP addresses is not known to be associated with the interface
- */
-int
-virNWFilterDelIpAddrForIfname(const char *ifname, const char *ipaddr)
-{
-    int ret = -1;
-    virNWFilterVarValuePtr val = NULL;
-
-    virMutexLock(&ipAddressMapLock);
-
-    if (ipaddr != NULL) {
-        val = virHashLookup(ipAddressMap->hashTable, ifname);
-        if (val) {
-            if (virNWFilterVarValueGetCardinality(val) == 1 &&
-                STREQ(ipaddr,
-                      virNWFilterVarValueGetNthValue(val, 0)))
-                goto remove_entry;
-            virNWFilterVarValueDelValue(val, ipaddr);
-            ret = virNWFilterVarValueGetCardinality(val);
-        }
-    } else {
-remove_entry:
-        /* remove whole entry */
-        val = virNWFilterHashTableRemoveEntry(ipAddressMap, ifname);
-        virNWFilterVarValueFree(val);
-        ret = 0;
-    }
-
-    virMutexUnlock(&ipAddressMapLock);
-
-    return ret;
-}
-
-/* Get the list of IP addresses known to be in use by an interface
- *
- * This function returns NULL in case no IP address is known to be
- * associated with the interface, a virNWFilterVarValuePtr otherwise
- * that then can contain one or multiple entries.
- */
-virNWFilterVarValuePtr
-virNWFilterGetIpAddrForIfname(const char *ifname)
-{
-    virNWFilterVarValuePtr res;
-
-    virMutexLock(&ipAddressMapLock);
-
-    res = virHashLookup(ipAddressMap->hashTable, ifname);
-
-    virMutexUnlock(&ipAddressMapLock);
-
-    return res;
-}
-
-
 #ifdef HAVE_LIBPCAP

 static void
@@ -699,7 +592,8 @@ learnIPAddressThread(void *arg)
         char *inetaddr;

         if ((inetaddr = virSocketAddrFormat(&sa)) != NULL) {
-            if (virNWFilterAddIpAddrForIfname(req->ifname, inetaddr) < 0) {
+            if (virNWFilterIPAddrMapAddIPAddrForIfname(req->ifname,
+                                                       inetaddr) < 0) {
                 VIR_ERROR(_("Failed to add IP address %s to IP address "
"cache for interface %s"), inetaddr, req->ifname);
             }
@@ -901,18 +795,6 @@ virNWFilterLearnInit(void) {
         return -1;
     }

-    ipAddressMap = virNWFilterHashTableCreate(0);
-    if (!ipAddressMap) {
-        virReportOOMError();
-        virNWFilterLearnShutdown();
-        return -1;
-    }
-
-    if (virMutexInit(&ipAddressMapLock) < 0) {
-        virNWFilterLearnShutdown();
-        return -1;
-    }
-
     ifaceLockMap = virHashCreate(0, freeIfaceLock);
     if (!ifaceLockMap) {
         virNWFilterLearnShutdown();
@@ -954,9 +836,6 @@ virNWFilterLearnShutdown(void)
     virHashFree(pendingLearnReq);
     pendingLearnReq = NULL;

-    virNWFilterHashTableFree(ipAddressMap);
-    ipAddressMap = NULL;
-
     virHashFree(ifaceLockMap);
     ifaceLockMap = NULL;
 }
Index: libvirt-acl/src/nwfilter/nwfilter_learnipaddr.h
===================================================================
--- libvirt-acl.orig/src/nwfilter/nwfilter_learnipaddr.h
+++ libvirt-acl/src/nwfilter/nwfilter_learnipaddr.h
@@ -65,9 +65,6 @@ int virNWFilterLearnIPAddress(virNWFilte
 virNWFilterIPAddrLearnReqPtr virNWFilterLookupLearnReq(int ifindex);
 int virNWFilterTerminateLearnReq(const char *ifname);

-int virNWFilterDelIpAddrForIfname(const char *ifname, const char *ipaddr);
-virNWFilterVarValuePtr virNWFilterGetIpAddrForIfname(const char *ifname);
-
 int virNWFilterLockIface(const char *ifname) ATTRIBUTE_RETURN_CHECK;
 void virNWFilterUnlockIface(const char *ifname);


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