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Re: [libvirt] Appending REJECT rules.



On 06/22/2011 06:01 PM, Eric Blake wrote:
On 05/18/2011 03:10 PM, Stephen O'Dor wrote:
Greetings folks,
Hello, and sorry for the delayed response.  Looks like this fell through
the cracks, because it wasn't in traditional 'git format-patch' style.

I've patched the libvirt iptables interface to append it's REJECT
rules rather than insert at the head. Idea being that I'm not the only
person who usually puts the REJECTs at the end of a chain.

In my particular case any custom ACCEPT rules involving the bridge
interfaces would get pushed below the rules that libvirt puts in to
REJECT everything on the bridge interface.

I'm using the routed network mode, I have no idea if this hurts any
other network mode.
Stefan is probably the best person to comment on whether this makes sense.

Thanks,

-Steve


--- iptables.c  2011-02-28 23:03:32.000000000 -0800
+++ iptables.c_new      2011-05-18 14:00:59.110855881 -0700
@@ -51,7 +51,8 @@

  enum {
      ADD = 0,
-    REMOVE
+    REMOVE,
+    APPEND
  };

  typedef struct
@@ -111,7 +112,7 @@
                          ? IP6TABLES_PATH : IPTABLES_PATH);

      virCommandAddArgList(cmd, "--table", rules->table,
-                         action == ADD ? "--insert" : "--delete",
+                         action == ADD ? "--insert" : action ==
REMOVE ? "--delete" : "--append",
                           rules->chain, arg, NULL);

      va_start(args, arg);
@@ -666,7 +667,7 @@
                              int family,
                              const char *iface)
  {
-    return iptablesForwardRejectOut(ctx, family, iface, ADD);
+    return iptablesForwardRejectOut(ctx, family, iface, APPEND);
  }

  /**
@@ -722,7 +723,7 @@
                             int family,
                             const char *iface)
  {
-    return iptablesForwardRejectIn(ctx, family, iface, ADD);
+    return iptablesForwardRejectIn(ctx, family, iface, APPEND);
  }

'ADD' caused an 'insertion' at position 0. Now 'APPEND' appends the new rule to the end. To me it makes sense per-se to put the reject rules to the end. There shoudn't be any negative side effects because of this. So I'd give it an ACK.

   Stefan

  /**

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