[libvirt] [PATCHv2 2/2] net: add support for specifying port range for forward mode nat
Laine Stump
laine at laine.org
Fri Feb 15 19:34:37 UTC 2013
From: Natanael Copa <ncopa at alpinelinux.org>
Let users set the port range to be used for forward mode NAT:
...
<forward mode='nat'>
<nat>
<port start='1024' end='65535'/>
</nat>
</forward>
...
Signed-off-by: Natanael Copa <ncopa at alpinelinux.org>
Signed-off-by: Laine Stump <laine at laine.org>
---
Differences from V1:
* rebased and resolved conflicts due to changes in PATCH 1/2
* renamed port_(start|end) to port(Start|End).
* fixed nits listed in review
docs/formatnetwork.html.in | 22 +++++++++++++---
src/conf/network_conf.c | 59 +++++++++++++++++++++++++++++++++++-------
src/conf/network_conf.h | 3 ++-
src/network/bridge_driver.c | 16 ++++++++++++
src/util/viriptables.c | 62 +++++++++++++++++++++++++++++++--------------
src/util/viriptables.h | 4 +++
6 files changed, 134 insertions(+), 32 deletions(-)
diff --git a/docs/formatnetwork.html.in b/docs/formatnetwork.html.in
index cad47d0..b85d9f6 100644
--- a/docs/formatnetwork.html.in
+++ b/docs/formatnetwork.html.in
@@ -139,9 +139,11 @@
<p>
<span class="since">Since 1.0.3</span> it is possible to
- specify a public IPv4 address range to be used for NAT
- by using the <code><nat></code> element and
- its <code><address></code> subelement.
+ specify a public IPv4 address and port range to be used for NAT
+ by using the <code><nat></code> element.
+ The address range is set with the <code><address></code>
+ subelement and <code>start</code> and <code>stop</code>
+ attributes:
</p>
<pre>
...
@@ -160,6 +162,20 @@
egress, just don't specify any <code><nat></code>
element.
</p>
+ <p>
+ The port range to be used for NAT can also be set via
+ the <code><port></code> subelement
+ of <code><nat></code>:
+ </p>
+ <pre>
+...
+ <forward mode='nat'>
+ <nat>
+ <port start='500' end='1000'/>
+ </nat>
+ </forward>
+...
+ </pre>
</dd>
<dt><code>route</code></dt>
diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c
index d7b31cf..581f885 100644
--- a/src/conf/network_conf.c
+++ b/src/conf/network_conf.c
@@ -1332,7 +1332,8 @@ virNetworkForwardNatDefParseXML(const char *networkName,
{
int ret = -1;
xmlNodePtr *natAddrNodes = NULL;
- int nNatAddrs;
+ xmlNodePtr *natPortNodes = NULL;
+ int nNatAddrs, nNatPorts;
char *addrStart = NULL;
char *addrEnd = NULL;
xmlNodePtr save = ctxt->node;
@@ -1390,6 +1391,36 @@ virNetworkForwardNatDefParseXML(const char *networkName,
goto cleanup;
}
+ /* ports for SNAT and MASQUERADE */
+ nNatPorts = virXPathNodeSet("./port", ctxt, &natPortNodes);
+ if (nNatPorts < 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("invalid <port> element found in <forward> of "
+ "network %s"), networkName);
+ goto cleanup;
+ } else if (nNatPorts > 1) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("Only one <port> element is allowed in <nat> in "
+ "<forward> in network %s"), networkName);
+ goto cleanup;
+ } else if (nNatPorts == 1) {
+ if (virXPathUInt("string(./port[1]/@start)", ctxt, &def->portStart) < 0
+ || def->portStart > 65535) {
+
+ virReportError(VIR_ERR_XML_DETAIL,
+ _("Missing or invalid 'start' attribute in <port> "
+ "in <nat> in <forward> in network %s"),
+ networkName);
+ goto cleanup;
+ }
+ if (virXPathUInt("string(./port[1]/@end)", ctxt, &def->portEnd) < 0
+ || def->portEnd > 65535 || def->portEnd < def->portStart) {
+ virReportError(VIR_ERR_XML_DETAIL,
+ _("Missing or invalid 'end' attribute in <port> in "
+ "<nat> in <forward> in network %s"), networkName);
+ goto cleanup;
+ }
+ }
ret = 0;
cleanup:
@@ -2194,16 +2225,25 @@ virNetworkForwardNatDefFormat(virBufferPtr buf,
goto cleanup;
}
- if (!addrEnd && !addrStart)
+ if (!addrEnd && !addrStart && !fwd->portStart && !fwd->portEnd)
return 0;
virBufferAddLit(buf, "<nat>\n");
virBufferAdjustIndent(buf, 2);
- virBufferAsprintf(buf, "<address start='%s'", addrStart);
- if (addrEnd)
- virBufferAsprintf(buf, " end='%s'", addrEnd);
- virBufferAsprintf(buf, "/>\n");
+ if (addrStart) {
+ virBufferAsprintf(buf, "<address start='%s'", addrStart);
+ if (addrEnd)
+ virBufferAsprintf(buf, " end='%s'", addrEnd);
+ virBufferAsprintf(buf, "/>\n");
+ }
+
+ if (fwd->portStart || fwd->portEnd) {
+ virBufferAsprintf(buf, "<port start='%d'", fwd->portStart);
+ if (fwd->portEnd)
+ virBufferAsprintf(buf, " end='%d'", fwd->portEnd);
+ virBufferAsprintf(buf, "/>\n");
+ }
virBufferAdjustIndent(buf, -2);
virBufferAsprintf(buf, "</nat>\n");
@@ -2259,9 +2299,10 @@ virNetworkDefFormatInternal(virBufferPtr buf,
else
virBufferAddLit(buf, " managed='no'");
}
- shortforward = !(def->forward.nifs || def->forward.npfs
- || VIR_SOCKET_ADDR_VALID(&def->forward.addrStart)
- || VIR_SOCKET_ADDR_VALID(&def->forward.addrEnd));
+ shortforward = !(def->forward.nifs || def->forward.npfs ||
+ VIR_SOCKET_ADDR_VALID(&def->forward.addrStart) ||
+ VIR_SOCKET_ADDR_VALID(&def->forward.addrEnd) ||
+ def->forward.portStart || def->forward.portEnd);
virBufferAsprintf(buf, "%s>\n", shortforward ? "/" : "");
virBufferAdjustIndent(buf, 2);
diff --git a/src/conf/network_conf.h b/src/conf/network_conf.h
index 11d6c9c..515115b 100644
--- a/src/conf/network_conf.h
+++ b/src/conf/network_conf.h
@@ -175,8 +175,9 @@ struct _virNetworkForwardDef {
size_t nifs;
virNetworkForwardIfDefPtr ifs;
- /* adresses for SNAT */
+ /* ranges for NAT */
virSocketAddr addrStart, addrEnd;
+ unsigned int portStart, portEnd;
};
typedef struct _virPortGroupDef virPortGroupDef;
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 9f502a5..cf47ec4 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -1589,6 +1589,8 @@ networkAddMasqueradingIptablesRules(struct network_driver *driver,
forwardIf,
&network->def->forward.addrStart,
&network->def->forward.addrEnd,
+ network->def->forward.portStart,
+ network->def->forward.portEnd,
NULL) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
forwardIf ?
@@ -1605,6 +1607,8 @@ networkAddMasqueradingIptablesRules(struct network_driver *driver,
forwardIf,
&network->def->forward.addrStart,
&network->def->forward.addrEnd,
+ network->def->forward.portStart,
+ network->def->forward.portEnd,
"udp") < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
forwardIf ?
@@ -1621,6 +1625,8 @@ networkAddMasqueradingIptablesRules(struct network_driver *driver,
forwardIf,
&network->def->forward.addrStart,
&network->def->forward.addrEnd,
+ network->def->forward.portStart,
+ network->def->forward.portEnd,
"tcp") < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
forwardIf ?
@@ -1639,6 +1645,8 @@ networkAddMasqueradingIptablesRules(struct network_driver *driver,
forwardIf,
&network->def->forward.addrStart,
&network->def->forward.addrEnd,
+ network->def->forward.portStart,
+ network->def->forward.portEnd,
"udp");
masqerr4:
iptablesRemoveForwardMasquerade(driver->iptables,
@@ -1647,6 +1655,8 @@ networkAddMasqueradingIptablesRules(struct network_driver *driver,
forwardIf,
&network->def->forward.addrStart,
&network->def->forward.addrEnd,
+ network->def->forward.portStart,
+ network->def->forward.portEnd,
NULL);
masqerr3:
iptablesRemoveForwardAllowRelatedIn(driver->iptables,
@@ -1679,6 +1689,8 @@ networkRemoveMasqueradingIptablesRules(struct network_driver *driver,
forwardIf,
&network->def->forward.addrStart,
&network->def->forward.addrEnd,
+ network->def->forward.portStart,
+ network->def->forward.portEnd,
"tcp");
iptablesRemoveForwardMasquerade(driver->iptables,
&ipdef->address,
@@ -1686,6 +1698,8 @@ networkRemoveMasqueradingIptablesRules(struct network_driver *driver,
forwardIf,
&network->def->forward.addrStart,
&network->def->forward.addrEnd,
+ network->def->forward.portStart,
+ network->def->forward.portEnd,
"udp");
iptablesRemoveForwardMasquerade(driver->iptables,
&ipdef->address,
@@ -1693,6 +1707,8 @@ networkRemoveMasqueradingIptablesRules(struct network_driver *driver,
forwardIf,
&network->def->forward.addrStart,
&network->def->forward.addrEnd,
+ network->def->forward.portStart,
+ network->def->forward.portEnd,
NULL);
iptablesRemoveForwardAllowRelatedIn(driver->iptables,
diff --git a/src/util/viriptables.c b/src/util/viriptables.c
index f8a09bf..b0951b5 100644
--- a/src/util/viriptables.c
+++ b/src/util/viriptables.c
@@ -807,6 +807,8 @@ iptablesForwardMasquerade(iptablesContext *ctx,
const char *physdev,
virSocketAddr *addrStart,
virSocketAddr *addrEnd,
+ unsigned int portStart,
+ unsigned int portEnd,
const char *protocol,
int action)
{
@@ -815,6 +817,7 @@ iptablesForwardMasquerade(iptablesContext *ctx,
char *addrStartStr = NULL;
char *addrEndStr = NULL;
char *addrRangeStr = NULL;
+ char *portRangeStr = NULL;
virCommandPtr cmd = NULL;
if (!(networkstr = iptablesFormatNetwork(netaddr, prefix)))
@@ -850,32 +853,44 @@ iptablesForwardMasquerade(iptablesContext *ctx,
if (physdev && physdev[0])
virCommandAddArgList(cmd, "--out-interface", physdev, NULL);
+ if (protocol && protocol[0]) {
+ if (portStart == 0 && portEnd == 0) {
+ portStart = 1024;
+ portEnd = 65535;
+ }
+ if (portStart > portEnd || portEnd > 65535) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Bad NAT port range '%u-%u'"),
+ portStart, portEnd);
+ goto cleanup;
+ }
+ if (virAsprintf(&portRangeStr, ":%u-%u", portStart, portEnd) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+ }
+
/* Use --jump SNAT if public addr is spec1ified */
if (addrStartStr && addrStartStr[0]) {
- const char *portstr = "";
-
- if (protocol && protocol[0])
- portstr = ":1024-65535";
if (addrEndStr && addrEndStr[0]) {
- if (virAsprintf(&addrRangeStr, "%s-%s%s",
- addrStartStr, addrEndStr, portstr) < 0) {
- virReportOOMError();
- goto cleanup;
- }
- } else {
- if (virAsprintf(&addrRangeStr, "%s%s", addrStartStr, portstr) < 0) {
+ if (virAsprintf(&addrRangeStr, "%s-%s%s", addrStartStr, addrEndStr,
+ portRangeStr ? portRangeStr : "") < 0) {
virReportOOMError();
goto cleanup;
}
+ } else if (virAsprintf(&addrRangeStr, "%s%s", addrStartStr,
+ portRangeStr ? portRangeStr : "") < 0) {
+ virReportOOMError();
+ goto cleanup;
}
virCommandAddArgList(cmd, "--jump", "SNAT",
- "--to-source", addrRangeStr, NULL);
- } else {
- virCommandAddArgList(cmd, "--jump", "MASQUERADE", NULL);
+ "--to-source", addrRangeStr, NULL);
+ } else {
+ virCommandAddArgList(cmd, "--jump", "MASQUERADE", NULL);
- if (protocol && protocol[0])
- virCommandAddArgList(cmd, "--to-ports", "1024-65535", NULL);
- }
+ if (portRangeStr && portRangeStr[0])
+ virCommandAddArgList(cmd, "--to-ports", &portRangeStr[1], NULL);
+ }
ret = iptablesCommandRunAndFree(cmd);
cleanup:
@@ -883,6 +898,7 @@ cleanup:
VIR_FREE(addrStartStr);
VIR_FREE(addrEndStr);
VIR_FREE(addrRangeStr);
+ VIR_FREE(portRangeStr);
return ret;
}
@@ -906,10 +922,14 @@ iptablesAddForwardMasquerade(iptablesContext *ctx,
const char *physdev,
virSocketAddr *addrStart,
virSocketAddr *addrEnd,
+ unsigned int portStart,
+ unsigned int portEnd,
const char *protocol)
{
return iptablesForwardMasquerade(ctx, netaddr, prefix, physdev,
- addrStart, addrEnd, protocol, ADD);
+ addrStart, addrEnd,
+ portStart, portEnd,
+ protocol, ADD);
}
/**
@@ -932,10 +952,14 @@ iptablesRemoveForwardMasquerade(iptablesContext *ctx,
const char *physdev,
virSocketAddr *addrStart,
virSocketAddr *addrEnd,
+ unsigned int portStart,
+ unsigned int portEnd,
const char *protocol)
{
return iptablesForwardMasquerade(ctx, netaddr, prefix, physdev,
- addrStart, addrEnd, protocol, REMOVE);
+ addrStart, addrEnd,
+ portStart, portEnd,
+ protocol, REMOVE);
}
diff --git a/src/util/viriptables.h b/src/util/viriptables.h
index 05362da..ca6adcc 100644
--- a/src/util/viriptables.h
+++ b/src/util/viriptables.h
@@ -109,6 +109,8 @@ int iptablesAddForwardMasquerade (iptablesContext *ctx,
const char *physdev,
virSocketAddr *addrStart,
virSocketAddr *addrEnd,
+ unsigned int portStart,
+ unsigned int portEnd,
const char *protocol);
int iptablesRemoveForwardMasquerade (iptablesContext *ctx,
virSocketAddr *netaddr,
@@ -116,6 +118,8 @@ int iptablesRemoveForwardMasquerade (iptablesContext *ctx,
const char *physdev,
virSocketAddr *addrStart,
virSocketAddr *addrEnd,
+ unsigned int portStart,
+ unsigned int portEnd,
const char *protocol);
int iptablesAddOutputFixUdpChecksum (iptablesContext *ctx,
const char *iface,
--
1.7.11.7
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