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[libvirt] [PATCH] nwfilter: enable rejection of packets



This patch adds the possibility to not just drop packets, but to also have them rejected where iptables at least sends an ICMP msg back to the originator. On ebtables this again maps into dropping packets since rejecting is not supported.

I am adding 'since 0.8.9' to the docs assuming this will be the next version of libvirt.

Signed-off-by: Stefan Berger <stefanb us ibm com>

---
 docs/formatnwfilter.html.in               |    8 +++++---
 docs/schemas/nwfilter.rng                 |    1 +
 src/conf/nwfilter_conf.c                  |    6 ++++--
 src/conf/nwfilter_conf.h                  |    1 +
 src/nwfilter/nwfilter_ebiptables_driver.c |   15 +++++++++++++--
 5 files changed, 24 insertions(+), 7 deletions(-)

Index: libvirt-acl/src/conf/nwfilter_conf.c
===================================================================
--- libvirt-acl.orig/src/conf/nwfilter_conf.c
+++ libvirt-acl/src/conf/nwfilter_conf.c
@@ -53,11 +53,13 @@

 VIR_ENUM_IMPL(virNWFilterRuleAction, VIR_NWFILTER_RULE_ACTION_LAST,
               "drop",
-              "accept");
+              "accept",
+              "reject");

 VIR_ENUM_IMPL(virNWFilterJumpTarget, VIR_NWFILTER_RULE_ACTION_LAST,
               "DROP",
-              "ACCEPT");
+              "ACCEPT",
+              "REJECT");

 VIR_ENUM_IMPL(virNWFilterRuleDirection, VIR_NWFILTER_RULE_DIRECTION_LAST,
               "in",
Index: libvirt-acl/src/conf/nwfilter_conf.h
===================================================================
--- libvirt-acl.orig/src/conf/nwfilter_conf.h
+++ libvirt-acl/src/conf/nwfilter_conf.h
@@ -291,6 +291,7 @@ struct _udpliteHdrFilterDef {
 enum virNWFilterRuleActionType {
     VIR_NWFILTER_RULE_ACTION_DROP = 0,
     VIR_NWFILTER_RULE_ACTION_ACCEPT,
+    VIR_NWFILTER_RULE_ACTION_REJECT,

     VIR_NWFILTER_RULE_ACTION_LAST,
 };
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
@@ -1516,7 +1516,7 @@ _iptablesCreateRuleInstance(int directio
     if (rule->action == VIR_NWFILTER_RULE_ACTION_ACCEPT)
         target = accept_target;
     else {
-        target = "DROP";
+        target = virNWFilterJumpTargetTypeToString(rule->action);
         skipMatch = defMatch;
     }

@@ -1880,6 +1880,7 @@ ebtablesCreateRuleInstance(char chainPre
          number[20];
     char chain[MAX_CHAINNAME_LENGTH];
     virBuffer buf = VIR_BUFFER_INITIALIZER;
+    const char *target;

     if (!ebtables_cmd_path) {
         virNWFilterReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@@ -2295,10 +2296,20 @@ ebtablesCreateRuleInstance(char chainPre
         return -1;
     }

+    switch (rule->action) {
+    case VIR_NWFILTER_RULE_ACTION_REJECT:
+        /* REJECT not supported */
+        target = virNWFilterJumpTargetTypeToString(
+                                     VIR_NWFILTER_RULE_ACTION_DROP);
+    break;
+    default:
+        target = virNWFilterJumpTargetTypeToString(rule->action);
+    }
+
     virBufferVSprintf(&buf,
                       " -j %s" CMD_DEF_POST CMD_SEPARATOR
                       CMD_EXEC,
-                      virNWFilterJumpTargetTypeToString(rule->action));
+                      target);

     if (virBufferError(&buf)) {
         virBufferFreeAndReset(&buf);
Index: libvirt-acl/docs/schemas/nwfilter.rng
===================================================================
--- libvirt-acl.orig/docs/schemas/nwfilter.rng
+++ libvirt-acl/docs/schemas/nwfilter.rng
@@ -839,6 +839,7 @@
<choice>
<value>drop</value>
<value>accept</value>
+ <value>reject</value>
</choice>
</define>

Index: libvirt-acl/docs/formatnwfilter.html.in
===================================================================
--- libvirt-acl.orig/docs/formatnwfilter.html.in
+++ libvirt-acl/docs/formatnwfilter.html.in
@@ -260,9 +260,11 @@
</p>
<ul>
<li>
- action -- mandatory; must either be <code>drop</code> or <code>accept</code> if
-        the evaluation of the filtering rule is supposed to drop or accept
-        a packet
+        action -- mandatory; must either be <code>drop</code>,
+ <code>reject</code><span class="since">(since 0.8.9)</span>,
+        or <code>accept</code> if
+        the evaluation of the filtering rule is supposed to drop,
+        reject (using ICMP message), or accept a packet
</li>
<li>
direction -- mandatory; must either be <code>in</code>, <code>out</code> or


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