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Re: [libvirt] [PATCH V1 4/9] Add a mac chain



On 11/21/2011 05:13 PM, Eric Blake wrote:
On 10/26/2011 09:12 AM, Stefan Berger wrote:
With hunks borrowed from one of David Steven's previous patches, we now
add the capability of having a 'mac' chain which is useful to filter
for multiple valid MAC addresses.

Signed-off-by: David L Stevens<dlstevens us ibm com>
Signed-off-by: Stefan Berger<stefanb linux vnet ibm com>

+    char protostr[16] = { 0, };
A bit oversized...


      PRINT_ROOT_CHAIN(rootchain, chainPrefix, ifname);
      PRINT_CHAIN(chain, chainPrefix, ifname,
                  (filtername) ? filtername : l3_protocols[protoidx].val);

+    switch (protoidx) {
+    case L2_PROTO_MAC_IDX:
+        break;
+    default:
+        snprintf(protostr, sizeof(protostr), "-p 0x%04x ",
for a max of 11 bytes (including trailing NUL) ever printed into it, but
not the end of the world.  And since you didn't check snprintf results
for failure, if we ever change the size of protostr or the length of
what we print into it, it's a slight maintenance risk we are taking on,
compared to dynamic allocation that always gets the right length.  But I
don't know if it is worth replacing this snprintf with
virAsprintf/VIR_FREE overhead, so I can live with it as is.
I converted it now to virAsprintf / VIR_FREE.
@@ -2918,7 +2930,7 @@ ebtablesCreateTmpSubChain(ebiptablesRule
                        CMD_DEF("%s -t %s -N %s") CMD_SEPARATOR
                        CMD_EXEC
                        "%s"
-                      CMD_DEF("%s -t %s -%%c %s %%s -p 0x%x -j %s")
+                      CMD_DEF("%s -t %s -%%c %s %%s %s -j %s")
This results in output with a double space, either:

...%s  -j ...

or

...%s -p 0xnnnn  -j ...

Also not the end of the world, but you may want to remove the extra
space before the -j.
Fixed. Will repost as v2.
ACK.  There is some conflict resolution needed in nwfilter.rng, but that
should be trivial.



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