This patch adds support for the connlimit match in iptables that is used
to limit number of outgoing directions.
Signed-off-by" Stefan Berger <stefanb@xxxxxxxxxx>
---
src/conf/nwfilter_conf.c | 5 ++
src/conf/nwfilter_conf.h | 1
src/nwfilter/nwfilter_ebiptables_driver.c | 57 +++++++++++++++++++++++-------
3 files changed, 50 insertions(+), 13 deletions(-)
Index: libvirt-acl/src/conf/nwfilter_conf.c
===================================================================
--- libvirt-acl.orig/src/conf/nwfilter_conf.c
+++ libvirt-acl/src/conf/nwfilter_conf.c
@@ -875,6 +875,11 @@ static const virXMLAttr2Struct ipv6Attri
.datatype = DATATYPE_UINT8,\
.dataIdx = offsetof(virNWFilterRuleDef, p.STRUCT.ipHdr.dataDSCP),\
/*.validator = dscpValidator,*/\
+ },\
+ {\
+ .name = "connlimit-above",\
+ .datatype = DATATYPE_UINT16,\
+ .dataIdx = offsetof(virNWFilterRuleDef, p.STRUCT.ipHdr.dataConnlimitAbove),\
}
#define COMMON_PORT_PROPS(STRUCT) \
Index: libvirt-acl/src/conf/nwfilter_conf.h
===================================================================
--- libvirt-acl.orig/src/conf/nwfilter_conf.h
+++ libvirt-acl/src/conf/nwfilter_conf.h
@@ -153,6 +153,7 @@ struct _ipHdrDataDef {
nwItemDesc dataDstIPFrom;
nwItemDesc dataDstIPTo;
nwItemDesc dataDSCP;
+ nwItemDesc dataConnlimitAbove;
};
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
@@ -815,7 +815,8 @@ static int
iptablesHandleIpHdr(virBufferPtr buf,
virNWFilterHashTablePtr vars,
ipHdrDataDefPtr ipHdr,
- int directionIn)
+ int directionIn,
+ bool *skipRule, bool *skipMatch)
{
char ipaddr[INET6_ADDRSTRLEN],
number[20];
@@ -944,6 +945,24 @@ iptablesHandleIpHdr(virBufferPtr buf,
number);
}
+ if (HAS_ENTRY_ITEM(&ipHdr->dataConnlimitAbove)) {
+ if (directionIn) {
+ // only support for limit in outgoing dir.
+ *skipRule = true;
+ } else {
+ if (printDataType(vars,
+ number, sizeof(number),
+ &ipHdr->dataConnlimitAbove))
+ goto err_exit;
+
+ virBufferVSprintf(buf,
+ " -m connlimit %s --connlimit-above %s",
+ ENTRY_GET_NEG_SIGN(&ipHdr->dataConnlimitAbove),
+ number);
+ *skipMatch = true;
+ }
+ }
+
return 0;
err_exit:
@@ -1063,6 +1082,8 @@ _iptablesCreateRuleInstance(int directio
: iptables_cmd_path;
unsigned int bufUsed;
bool srcMacSkipped = false;
+ bool skipRule = false;
+ bool skipMatch = false;
if (!iptables_cmd) {
virNWFilterReportError(VIR_ERR_INTERNAL_ERROR,
@@ -1096,7 +1117,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.tcpHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
if (iptablesHandlePortData(&buf,
@@ -1140,7 +1162,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.udpHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
if (iptablesHandlePortData(&buf,
@@ -1171,7 +1194,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.udpliteHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
break;
@@ -1197,7 +1221,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.espHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
break;
@@ -1223,7 +1248,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.ahHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
break;
@@ -1249,7 +1275,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.sctpHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
if (iptablesHandlePortData(&buf,
@@ -1283,7 +1310,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.icmpHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
if (HAS_ENTRY_ITEM(&rule->p.icmpHdrFilter.dataICMPType)) {
@@ -1341,7 +1369,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.igmpHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
break;
@@ -1367,7 +1396,8 @@ _iptablesCreateRuleInstance(int directio
if (iptablesHandleIpHdr(&buf,
vars,
&rule->p.allHdrFilter.ipHdr,
- directionIn))
+ directionIn,
+ &skipRule, &skipMatch))
goto err_exit;
break;
@@ -1376,7 +1406,8 @@ _iptablesCreateRuleInstance(int directio
return -1;
}
- if (srcMacSkipped && bufUsed == virBufferUse(&buf)) {
+ if ((srcMacSkipped && bufUsed == virBufferUse(&buf)) ||
+ skipRule) {
virBufferFreeAndReset(&buf);
return 0;
}
@@ -1385,10 +1416,10 @@ _iptablesCreateRuleInstance(int directio
target = accept_target;
else {
target = "DROP";
- match = NULL;
+ skipMatch = true;
}
- if (match)
+ if (match && !skipMatch)
virBufferVSprintf(&buf, " %s", match);
--
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