[PATCH 21/23] qemu-process: prepare slirp-helper

[marcandre.lureau@xxxxxxxxxx]

From: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>

When the network interface is of "user" type, and QEMU has the "-net
socket,fd=" datagram support, call qemuInterfacePrepareSlirp() to
probe and associate a slirp-helper with the interface.

The usage of automated slirp-helper can be prevented with
VIR_QEMU_PROCESS_START_NO_SLIRP (in particular when resuming a
VM that didn't start with slirp-helper before).

Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
---
 src/qemu/qemu_interface.c | 27 +++++++++++++++++++++++++++
 src/qemu/qemu_interface.h |  4 ++++
 src/qemu/qemu_process.c   | 17 ++++++++++++++---
 3 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_interface.c b/src/qemu/qemu_interface.c
index c8effa68f4..e58f464d87 100644
--- a/src/qemu/qemu_interface.c
+++ b/src/qemu/qemu_interface.c
@@ -603,6 +603,33 @@ qemuInterfaceBridgeConnect(virDomainDefPtr def,
 }
 
 
+qemuSlirpPtr
+qemuInterfacePrepareSlirp(virQEMUDriverPtr driver,
+                          virDomainNetDefPtr net)
+{
+    virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
+    VIR_AUTOPTR(qemuSlirp) slirp = NULL;
+    size_t i;
+
+    if (!(slirp = qemuSlirpNewForHelper(cfg->slirpHelperName)))
+        return NULL;
+
+    for (i = 0; i < net->guestIP.nips; i++) {
+        const virNetDevIPAddr *ip = net->guestIP.ips[i];
+
+        if (VIR_SOCKET_ADDR_IS_FAMILY(&ip->address, AF_INET) &&
+            !qemuSlirpHasFeature(slirp, QEMU_SLIRP_FEATURE_IPV4))
+            return NULL;
+
+        if (VIR_SOCKET_ADDR_IS_FAMILY(&ip->address, AF_INET6) &&
+            !qemuSlirpHasFeature(slirp, QEMU_SLIRP_FEATURE_IPV6))
+            return NULL;
+    }
+
+    VIR_RETURN_PTR(slirp);
+}
+
+
 /**
  * qemuInterfaceOpenVhostNet:
  * @def: domain definition
diff --git a/src/qemu/qemu_interface.h b/src/qemu/qemu_interface.h
index 5a2f87e532..0464b903d7 100644
--- a/src/qemu/qemu_interface.h
+++ b/src/qemu/qemu_interface.h
@@ -24,6 +24,7 @@
 #include "domain_conf.h"
 #include "qemu_conf.h"
 #include "qemu_domain.h"
+#include "qemu_slirp.h"
 
 int qemuInterfaceStartDevice(virDomainNetDefPtr net);
 int qemuInterfaceStartDevices(virDomainDefPtr def);
@@ -54,3 +55,6 @@ int qemuInterfaceOpenVhostNet(virDomainDefPtr def,
                               virDomainNetDefPtr net,
                               int *vhostfd,
                               size_t *vhostfdSize);
+
+qemuSlirpPtr qemuInterfacePrepareSlirp(virQEMUDriverPtr driver,
+                                       virDomainNetDefPtr net);
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index d067223a0e..856460f0b6 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -5619,8 +5619,12 @@ qemuProcessInit(virQEMUDriverPtr driver,
  * qemuProcessNetworkPrepareDevices
  */
 static int
-qemuProcessNetworkPrepareDevices(virDomainDefPtr def)
+qemuProcessNetworkPrepareDevices(virQEMUDriverPtr driver,
+                                 virDomainObjPtr vm,
+                                 unsigned int flags)
 {
+    virDomainDefPtr def = vm->def;
+    qemuDomainObjPrivatePtr priv = vm->privateData;
     int ret = -1;
     size_t i;
     virConnectPtr conn = NULL;
@@ -5665,7 +5669,14 @@ qemuProcessNetworkPrepareDevices(virDomainDefPtr def)
             }
             if (virDomainHostdevInsert(def, hostdev) < 0)
                 goto cleanup;
-        }
+        } else if (actualType == VIR_DOMAIN_NET_TYPE_USER &&
+                   !(flags & VIR_QEMU_PROCESS_START_NO_SLIRP) &&
+                   virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_NET_SOCKET_DGRAM)) {
+            qemuSlirpPtr slirp = qemuInterfacePrepareSlirp(driver, net);
+
+            QEMU_DOMAIN_NETWORK_PRIVATE(net)->slirp = slirp;
+         }
+
     }
     ret = 0;
  cleanup:
@@ -6468,7 +6479,7 @@ qemuProcessPrepareHost(virQEMUDriverPtr driver,
      * will need to be setup.
      */
     VIR_DEBUG("Preparing network devices");
-    if (qemuProcessNetworkPrepareDevices(vm->def) < 0)
+    if (qemuProcessNetworkPrepareDevices(driver, vm, flags) < 0)
         goto cleanup;
 
     /* Must be run before security labelling */
-- 
2.22.0.214.g8dca754b1e

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