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[libvirt] [PATCH 1/2] nwfilter: use shell variable to invoke 'ebtables' command



Introduce a shell variable 'EBT' to invoke the ebtables command.
Hard-code the used ebtables table to '-t nat'.

Tested with libvirt-tck.

---
 src/nwfilter/nwfilter_ebiptables_driver.c |  170 +++++++++++++++++-------------
 1 file changed, 97 insertions(+), 73 deletions(-)

Index: libvirt-acl/src/nwfilter/nwfilter_ebiptables_driver.c
===================================================================
--- libvirt-acl.orig/src/nwfilter/nwfilter_ebiptables_driver.c
+++ libvirt-acl/src/nwfilter/nwfilter_ebiptables_driver.c
@@ -46,7 +46,6 @@
 #define VIR_FROM_THIS VIR_FROM_NWFILTER
 
 
-#define EBTABLES_DEFAULT_TABLE  "nat"
 #define EBTABLES_CHAIN_INCOMING "PREROUTING"
 #define EBTABLES_CHAIN_OUTGOING "POSTROUTING"
 
@@ -86,7 +85,6 @@ static char *ip6tables_cmd_path;
 static char *grep_cmd_path;
 static char *gawk_cmd_path;
 
-
 #define PRINT_ROOT_CHAIN(buf, prefix, ifname) \
     snprintf(buf, sizeof(buf), "libvirt-%c-%s", prefix, ifname)
 #define PRINT_CHAIN(buf, prefix, ifname, suffix) \
@@ -110,7 +108,7 @@ static const char ebtables_script_func_c
     "collect_chains()\n"
     "{\n"
     "  for tmp2 in $*; do\n"
-    "    for tmp in $(%s -t %s -L $tmp2 | \\\n"
+    "    for tmp in $($EBT -t nat -L $tmp2 | \\\n"
     "      sed -n \"/Bridge chain/,\\$ s/.*-j \\\\([%s]-.*\\\\)/\\\\1/p\");\n"
     "    do\n"
     "      echo $tmp\n"
@@ -122,8 +120,8 @@ static const char ebtables_script_func_c
 static const char ebiptables_script_func_rm_chains[] =
     "rm_chains()\n"
     "{\n"
-    "  for tmp in $*; do %s -t %s -F $tmp; done\n"
-    "  for tmp in $*; do %s -t %s -X $tmp; done\n"
+    "  for tmp in $*; do $EBT -t nat -F $tmp; done\n"
+    "  for tmp in $*; do $EBT -t nat -X $tmp; done\n"
     "}\n";
 
 static const char ebiptables_script_func_rename_chains[] =
@@ -131,8 +129,8 @@ static const char ebiptables_script_func
     "{\n"
     "  for tmp in $*; do\n"
     "    case $tmp in\n"
-    "      %c*) %s -t %s -E $tmp %c${tmp#?} ;;\n"
-    "      %c*) %s -t %s -E $tmp %c${tmp#?} ;;\n"
+    "      %c*) $EBT -t nat -E $tmp %c${tmp#?} ;;\n"
+    "      %c*) $EBT -t nat -E $tmp %c${tmp#?} ;;\n"
     "    esac\n"
     "  done\n"
     "}\n";
@@ -146,6 +144,9 @@ static const char ebiptables_script_set_
 #define NWFILTER_FUNC_RENAME_CHAINS ebiptables_script_func_rename_chains
 #define NWFILTER_FUNC_SET_IFS ebiptables_script_set_ifs
 
+#define NWFILTER_SET_EBTABLES_SHELLVAR(BUFPTR) \
+    virBufferAsprintf(BUFPTR, "EBT=%s\n", ebtables_cmd_path);
+
 #define VIRT_IN_CHAIN      "libvirt-in"
 #define VIRT_OUT_CHAIN     "libvirt-out"
 #define VIRT_IN_POST_CHAIN "libvirt-in-post"
@@ -1990,9 +1991,8 @@ ebtablesCreateRuleInstance(char chainPre
     case VIR_NWFILTER_RULE_PROTOCOL_MAC:
 
         virBufferAsprintf(&buf,
-                          CMD_DEF_PRE "%s -t %s -%%c %s %%s",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain);
-
+                          CMD_DEF_PRE "$EBT -t nat -%%c %s %%s",
+                          chain);
 
         if (ebtablesHandleEthHdr(&buf,
                                  vars,
@@ -2015,8 +2015,8 @@ ebtablesCreateRuleInstance(char chainPre
     case VIR_NWFILTER_RULE_PROTOCOL_VLAN:
 
         virBufferAsprintf(&buf,
-                          CMD_DEF_PRE "%s -t %s -%%c %s %%s",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain);
+                          CMD_DEF_PRE "$EBT -t nat -%%c %s %%s",
+                          chain);
 
 
         if (ebtablesHandleEthHdr(&buf,
@@ -2082,8 +2082,8 @@ ebtablesCreateRuleInstance(char chainPre
         }
 
         virBufferAsprintf(&buf,
-                          CMD_DEF_PRE "%s -t %s -%%c %s %%s",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain);
+                          CMD_DEF_PRE "$EBT -t nat -%%c %s %%s",
+                          chain);
 
 
         if (ebtablesHandleEthHdr(&buf,
@@ -2120,8 +2120,8 @@ ebtablesCreateRuleInstance(char chainPre
     case VIR_NWFILTER_RULE_PROTOCOL_RARP:
 
         virBufferAsprintf(&buf,
-                          CMD_DEF_PRE "%s -t %s -%%c %s %%s",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain);
+                          CMD_DEF_PRE "$EBT -t nat -%%c %s %%s",
+                          chain);
 
         if (ebtablesHandleEthHdr(&buf,
                                  vars,
@@ -2229,8 +2229,8 @@ ebtablesCreateRuleInstance(char chainPre
 
     case VIR_NWFILTER_RULE_PROTOCOL_IP:
         virBufferAsprintf(&buf,
-                          CMD_DEF_PRE "%s -t %s -%%c %s %%s",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain);
+                          CMD_DEF_PRE "$EBT -t nat -%%c %s %%s",
+                          chain);
 
         if (ebtablesHandleEthHdr(&buf,
                                  vars,
@@ -2365,8 +2365,8 @@ ebtablesCreateRuleInstance(char chainPre
 
     case VIR_NWFILTER_RULE_PROTOCOL_IPV6:
         virBufferAsprintf(&buf,
-                          CMD_DEF_PRE "%s -t %s -%%c %s %%s",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain);
+                          CMD_DEF_PRE "$EBT -t nat -%%c %s %%s",
+                          chain);
 
         if (ebtablesHandleEthHdr(&buf,
                                  vars,
@@ -2489,8 +2489,8 @@ ebtablesCreateRuleInstance(char chainPre
 
     case VIR_NWFILTER_RULE_PROTOCOL_NONE:
         virBufferAsprintf(&buf,
-                          CMD_DEF_PRE "%s -t %s -%%c %s %%s",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain);
+                          CMD_DEF_PRE "$EBT -t nat -%%c %s %%s",
+                          chain);
     break;
 
     default:
@@ -2757,10 +2757,10 @@ ebtablesCreateTmpRootChain(virBufferPtr 
     PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
 
     virBufferAsprintf(buf,
-                      CMD_DEF("%s -t %s -N %s") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -N %s") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain,
+                      chain,
                       CMD_STOPONERR(stopOnError));
 
     return 0;
@@ -2780,10 +2780,9 @@ ebtablesLinkTmpRootChain(virBufferPtr bu
     PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
 
     virBufferAsprintf(buf,
-                      CMD_DEF("%s -t %s -A %s -%c %s -j %s") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -%c %s -j %s") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
                       (incoming) ? EBTABLES_CHAIN_INCOMING
                                  : EBTABLES_CHAIN_OUTGOING,
                       iodev, ifname, chain,
@@ -2811,10 +2810,10 @@ _ebtablesRemoveRootChain(virBufferPtr bu
     PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
 
     virBufferAsprintf(buf,
-                      "%s -t %s -F %s" CMD_SEPARATOR
-                      "%s -t %s -X %s" CMD_SEPARATOR,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain);
+                      "$EBT -t nat -F %s" CMD_SEPARATOR
+                      "$EBT -t nat -X %s" CMD_SEPARATOR,
+                      chain,
+                      chain);
 
     return 0;
 }
@@ -2856,8 +2855,7 @@ _ebtablesUnlinkRootChain(virBufferPtr bu
     PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
 
     virBufferAsprintf(buf,
-                      "%s -t %s -D %s -%c %s -j %s" CMD_SEPARATOR,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
+                      "$EBT -t nat -D %s -%c %s -j %s" CMD_SEPARATOR,
                       (incoming) ? EBTABLES_CHAIN_INCOMING
                                  : EBTABLES_CHAIN_OUTGOING,
                       iodev, ifname, chain);
@@ -2917,25 +2915,24 @@ ebtablesCreateTmpSubChain(ebiptablesRule
     }
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -F %s") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -F %s") CMD_SEPARATOR
                       CMD_EXEC
-                      CMD_DEF("%s -t %s -X %s") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -X %s") CMD_SEPARATOR
                       CMD_EXEC
-                      CMD_DEF("%s -t %s -N %s") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -N %s") CMD_SEPARATOR
                       CMD_EXEC
                       "%s"
-                      CMD_DEF("%s -t %s -%%c %s %%s %s -j %s")
+                      CMD_DEF("$EBT -t nat -%%c %s %%s %s -j %s")
                           CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain,
+                      chain,
+                      chain,
+                      chain,
 
                       CMD_STOPONERR(stopOnError),
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
                       rootchain, protostr, chain,
 
                       CMD_STOPONERR(stopOnError));
@@ -2967,11 +2964,11 @@ _ebtablesRemoveSubChains(virBufferPtr bu
     char rootchain[MAX_CHAINNAME_LENGTH];
     unsigned i;
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(buf);
+
     virBufferAsprintf(buf, NWFILTER_FUNC_COLLECT_CHAINS,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chains);
-    virBufferAsprintf(buf, NWFILTER_FUNC_RM_CHAINS,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE);
+                      chains);
+    virBufferAdd(buf, NWFILTER_FUNC_RM_CHAINS, -1);
 
     virBufferAsprintf(buf, NWFILTER_FUNC_SET_IFS);
     virBufferAddLit(buf, "chains=\"$(collect_chains");
@@ -2984,8 +2981,7 @@ _ebtablesRemoveSubChains(virBufferPtr bu
     for (i = 0; chains[i] != 0; i++) {
         PRINT_ROOT_CHAIN(rootchain, chains[i], ifname);
         virBufferAsprintf(buf,
-                          "%s -t %s -F %s\n",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
+                          "$EBT -t nat -F %s\n",
                           rootchain);
     }
     virBufferAddLit(buf, "rm_chains $chains\n");
@@ -3040,8 +3036,8 @@ ebtablesRenameTmpSubChain(virBufferPtr b
     }
 
     virBufferAsprintf(buf,
-                      "%s -t %s -E %s %s" CMD_SEPARATOR,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, tmpchain, chain);
+                      "$EBT -t nat -E %s %s" CMD_SEPARATOR,
+                      tmpchain, chain);
     return 0;
 }
 
@@ -3064,14 +3060,14 @@ ebtablesRenameTmpSubAndRootChains(virBuf
         CHAINPREFIX_HOST_OUT_TEMP,
         0};
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(buf);
+
     virBufferAsprintf(buf, NWFILTER_FUNC_COLLECT_CHAINS,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chains);
+                      chains);
     virBufferAsprintf(buf, NWFILTER_FUNC_RENAME_CHAINS,
                       CHAINPREFIX_HOST_IN_TEMP,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
                       CHAINPREFIX_HOST_IN,
                       CHAINPREFIX_HOST_OUT_TEMP,
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
                       CHAINPREFIX_HOST_OUT);
 
     virBufferAsprintf(buf, NWFILTER_FUNC_SET_IFS);
@@ -3151,40 +3147,41 @@ ebtablesApplyBasicRules(const char *ifna
 
     ebiptablesAllTeardown(ifname);
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
     ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
 
     PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s -s ! %s -j DROP") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -s ! %s -j DROP") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
                       chain, macaddr_str,
                       CMD_STOPONERR(1));
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s -p IPv4 -j ACCEPT") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -p IPv4 -j ACCEPT") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain,
+                      chain,
                       CMD_STOPONERR(1));
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s -p ARP -j ACCEPT") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -p ARP -j ACCEPT") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain,
+                      chain,
                       CMD_STOPONERR(1));
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s -j DROP") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -j DROP") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain,
+                      chain,
                       CMD_STOPONERR(1));
 
     ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
@@ -3250,6 +3247,8 @@ ebtablesApplyDHCPOnlyRules(const char *i
 
     ebiptablesAllTeardown(ifname);
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
     ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
     ebtablesCreateTmpRootChain(&buf, 0, ifname, 1);
 
@@ -3257,7 +3256,7 @@ ebtablesApplyDHCPOnlyRules(const char *i
     PRINT_ROOT_CHAIN(chain_out, CHAINPREFIX_HOST_OUT_TEMP, ifname);
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s"
+                      CMD_DEF("$EBT -t nat -A %s"
                               " -s %s -d Broadcast "
                               " -p ipv4 --ip-protocol udp"
                               " --ip-src 0.0.0.0 --ip-dst 255.255.255.255"
@@ -3266,20 +3265,20 @@ ebtablesApplyDHCPOnlyRules(const char *i
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain_in,
+                      chain_in,
                       macaddr_str,
                       CMD_STOPONERR(1));
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s -j DROP") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -j DROP") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain_in,
+                      chain_in,
                       CMD_STOPONERR(1));
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s"
+                      CMD_DEF("$EBT -t nat -A %s"
                               " -d %s"
                               " -p ipv4 --ip-protocol udp"
                               " %s"
@@ -3288,17 +3287,17 @@ ebtablesApplyDHCPOnlyRules(const char *i
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain_out,
+                      chain_out,
                       macaddr_str,
                       srcIPParam != NULL ? srcIPParam : "",
                       CMD_STOPONERR(1));
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s -j DROP") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -j DROP") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain_out,
+                      chain_out,
                       CMD_STOPONERR(1));
 
     ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
@@ -3352,6 +3351,8 @@ ebtablesApplyDropAllRules(const char *if
 
     ebiptablesAllTeardown(ifname);
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
     ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
     ebtablesCreateTmpRootChain(&buf, 0, ifname, 1);
 
@@ -3359,19 +3360,19 @@ ebtablesApplyDropAllRules(const char *if
     PRINT_ROOT_CHAIN(chain_out, CHAINPREFIX_HOST_OUT_TEMP, ifname);
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s -j DROP") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -j DROP") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain_in,
+                      chain_in,
                       CMD_STOPONERR(1));
 
     virBufferAsprintf(&buf,
-                      CMD_DEF("%s -t %s -A %s -j DROP") CMD_SEPARATOR
+                      CMD_DEF("$EBT -t nat -A %s -j DROP") CMD_SEPARATOR
                       CMD_EXEC
                       "%s",
 
-                      ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain_out,
+                      chain_out,
                       CMD_STOPONERR(1));
 
     ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
@@ -3410,6 +3411,8 @@ static int ebtablesCleanAll(const char *
     if (!ebtables_cmd_path)
         return 0;
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
     ebtablesUnlinkRootChain(&buf, 1, ifname);
     ebtablesUnlinkRootChain(&buf, 0, ifname);
     ebtablesRemoveSubChains(&buf, ifname);
@@ -3611,8 +3614,11 @@ ebiptablesApplyNewRules(virConnectPtr co
         }
     }
 
+
     /* cleanup whatever may exist */
     if (ebtables_cmd_path) {
+        NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
         ebtablesUnlinkTmpRootChain(&buf, 1, ifname);
         ebtablesUnlinkTmpRootChain(&buf, 0, ifname);
         ebtablesRemoveTmpSubChains(&buf, ifname);
@@ -3621,6 +3627,8 @@ ebiptablesApplyNewRules(virConnectPtr co
         ebiptablesExecCLI(&buf, &cli_status, NULL);
     }
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
     /* create needed chains */
     if (ebtablesCreateTmpRootAndSubChains(&buf, ifname, chains_in_set , 1,
                                           &ebtChains, &nEbtChains) ||
@@ -3636,6 +3644,8 @@ ebiptablesApplyNewRules(virConnectPtr co
     if (ebiptablesExecCLI(&buf, &cli_status, &errmsg) || cli_status != 0)
         goto tear_down_tmpebchains;
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
     /* process ebtables commands; interleave commands from filters with
        commands for creating and connecting ebtables chains */
     j = 0;
@@ -3735,6 +3745,8 @@ ebiptablesApplyNewRules(virConnectPtr co
         iptablesCheckBridgeNFCallEnabled(true);
     }
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
     if (virHashSize(chains_in_set) != 0)
         ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
     if (virHashSize(chains_out_set) != 0)
@@ -3756,6 +3768,8 @@ ebiptablesApplyNewRules(virConnectPtr co
 
 tear_down_ebsubchains_and_unlink:
     if (ebtables_cmd_path) {
+        NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
         ebtablesUnlinkTmpRootChain(&buf, 1, ifname);
         ebtablesUnlinkTmpRootChain(&buf, 0, ifname);
     }
@@ -3774,6 +3788,8 @@ tear_down_tmpiptchains:
 
 tear_down_tmpebchains:
     if (ebtables_cmd_path) {
+        NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
         ebtablesRemoveTmpSubChains(&buf, ifname);
         ebtablesRemoveTmpRootChain(&buf, 1, ifname);
         ebtablesRemoveTmpRootChain(&buf, 0, ifname);
@@ -3819,6 +3835,8 @@ ebiptablesTearNewRules(virConnectPtr con
     }
 
     if (ebtables_cmd_path) {
+        NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
         ebtablesUnlinkTmpRootChain(&buf, 1, ifname);
         ebtablesUnlinkTmpRootChain(&buf, 0, ifname);
 
@@ -3858,6 +3876,8 @@ ebiptablesTearOldRules(virConnectPtr con
     }
 
     if (ebtables_cmd_path) {
+        NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
         ebtablesUnlinkRootChain(&buf, 1, ifname);
         ebtablesUnlinkRootChain(&buf, 0, ifname);
 
@@ -3899,6 +3919,8 @@ ebiptablesRemoveRules(virConnectPtr conn
     virBuffer buf = VIR_BUFFER_INITIALIZER;
     ebiptablesRuleInstPtr *inst = (ebiptablesRuleInstPtr *)_inst;
 
+    NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
     for (i = 0; i < nruleInstances; i++)
         ebiptablesInstCommand(&buf,
                               inst[i]->commandTemplate,
@@ -3948,6 +3970,8 @@ ebiptablesAllTeardown(const char *ifname
     }
 
     if (ebtables_cmd_path) {
+        NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
+
         ebtablesUnlinkRootChain(&buf, 1, ifname);
         ebtablesUnlinkRootChain(&buf, 0, ifname);
 
@@ -4003,12 +4027,12 @@ ebiptablesDriverInit(bool privileged)
 
     ebtables_cmd_path = virFindFileInPath("ebtables");
     if (ebtables_cmd_path) {
+        NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
         /* basic probing */
         virBufferAsprintf(&buf,
-                          CMD_DEF("%s -t %s -L") CMD_SEPARATOR
+                          CMD_DEF("$EBT -t nat -L") CMD_SEPARATOR
                           CMD_EXEC
                           "%s",
-                          ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
                           CMD_STOPONERR(1));
 
         if (ebiptablesExecCLI(&buf, &cli_status, NULL) || cli_status)


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