nwfilter: also purge ip(6)tables rules before detecting IP address

Rather than only cleaning any remaining ebtables rules, also clean those applied to iptables and ip6tables when detecting the IP address of an interface. Previous applied iptables rules may hinder DHCP packets.

src/nwfilter/nwfilter_ebiptables_driver.c

@@ -117,6 +117,7 @@ static int ebtablesRemoveBasicRules(const char *ifname);
 static int ebiptablesDriverInit(void);
 static void ebiptablesDriverShutdown(void);
 static int ebtablesCleanAll(const char *ifname);
+static int ebiptablesAllTeardown(const char *ifname);
 
 static virMutex execCLIMutex;
 
@@ -2942,7 +2943,7 @@ ebtablesApplyBasicRules(const char *ifname,
 
     virFormatMacAddr(macaddr, macaddr_str);
 
-    ebtablesCleanAll(ifname);
+    ebiptablesAllTeardown(ifname);
 
     ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
 
@@ -3041,7 +3042,7 @@ ebtablesApplyDHCPOnlyRules(const char *ifname,
 
     virFormatMacAddr(macaddr, macaddr_str);
 
-    ebtablesCleanAll(ifname);
+    ebiptablesAllTeardown(ifname);
 
     ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
     ebtablesCreateTmpRootChain(&buf, 0, ifname, 1);
@@ -3143,7 +3144,7 @@ ebtablesApplyDropAllRules(const char *ifname)
         return 1;
     }
 
-    ebtablesCleanAll(ifname);
+    ebiptablesAllTeardown(ifname);
 
     ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
     ebtablesCreateTmpRootChain(&buf, 0, ifname, 1);