[PATCH v2 3/3] network: Taint networks that are using hook script

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

Basically, the idea is copied from domain code, where tainting
exists for a while. Currently, only one taint reason exists -
VIR_NETWORK_TAINT_HOOK to mark those networks which caused invoking
of hook script.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/conf/network_conf.c     | 16 ++++++++++++++++
 src/conf/network_conf.h     | 17 +++++++++++++++++
 src/libvirt_private.syms    |  3 +++
 src/network/bridge_driver.c | 26 ++++++++++++++++++++++++++
 4 files changed, 62 insertions(+)

diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c
index e59938c..aa881d8 100644
--- a/src/conf/network_conf.c
+++ b/src/conf/network_conf.c
@@ -72,6 +72,22 @@ VIR_ENUM_IMPL(virNetworkDNSForwardPlainNames,
               "yes",
               "no")
 
+VIR_ENUM_IMPL(virNetworkTaint, VIR_NETWORK_TAINT_LAST,
+              "hook-script");
+
+bool
+virNetworkObjTaint(virNetworkObjPtr obj,
+                   enum virNetworkTaintFlags taint)
+{
+    unsigned int flag = (1 << taint);
+
+    if (obj->taint & flag)
+        return false;
+
+    obj->taint |= flag;
+    return true;
+}
+
 virNetworkObjPtr virNetworkFindByUUID(virNetworkObjListPtr nets,
                                       const unsigned char *uuid)
 {
diff --git a/src/conf/network_conf.h b/src/conf/network_conf.h
index b84762a..edcc49f 100644
--- a/src/conf/network_conf.h
+++ b/src/conf/network_conf.h
@@ -287,6 +287,8 @@ struct _virNetworkObj {
 
     virBitmapPtr class_id; /* bitmap of class IDs for QoS */
     unsigned long long floor_sum; /* sum of all 'floor'-s of attached NICs */
+
+    unsigned int taint;
 };
 
 typedef struct _virNetworkObjList virNetworkObjList;
@@ -296,12 +298,26 @@ struct _virNetworkObjList {
     virNetworkObjPtr *objs;
 };
 
+enum virNetworkTaintFlags {
+    VIR_NETWORK_TAINT_HOOK,                 /* Hook script was executed over
+                                               network. We can't guarantee
+                                               connectivity or other settings
+                                               as the script may have played
+                                               with iptables, tc, you name it.
+                                             */
+
+    VIR_NETWORK_TAINT_LAST
+};
+
 static inline int
 virNetworkObjIsActive(const virNetworkObj *net)
 {
     return net->active;
 }
 
+bool virNetworkObjTaint(virNetworkObjPtr obj,
+                        enum virNetworkTaintFlags taint);
+
 virNetworkObjPtr virNetworkFindByUUID(virNetworkObjListPtr nets,
                                       const unsigned char *uuid);
 virNetworkObjPtr virNetworkFindByName(virNetworkObjListPtr nets,
@@ -452,4 +468,5 @@ virNetworkDefUpdateSection(virNetworkDefPtr def,
                            const char *xml,
                            unsigned int flags);  /* virNetworkUpdateFlags */
 
+VIR_ENUM_DECL(virNetworkTaint)
 #endif /* __NETWORK_CONF_H__ */
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index c5a7637..0759d73 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -525,6 +525,7 @@ virNetworkObjListFree;
 virNetworkObjLock;
 virNetworkObjReplacePersistentDef;
 virNetworkObjSetDefTransient;
+virNetworkObjTaint;
 virNetworkObjUnlock;
 virNetworkObjUnsetDefTransient;
 virNetworkObjUpdate;
@@ -533,6 +534,8 @@ virNetworkSaveConfig;
 virNetworkSaveStatus;
 virNetworkSetBridgeMacAddr;
 virNetworkSetBridgeName;
+virNetworkTaintTypeFromString;
+virNetworkTaintTypeToString;
 virPortGroupFindByName;
 
 
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 1ba2b2d..f2aef48 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -112,6 +112,9 @@ static int networkPlugBandwidth(virNetworkObjPtr net,
 static int networkUnplugBandwidth(virNetworkObjPtr net,
                                   virDomainNetDefPtr iface);
 
+static void networkNetworkObjTaint(virNetworkObjPtr net,
+                                   enum virNetworkTaintFlags taint);
+
 static virNetworkDriverStatePtr driverState = NULL;
 
 static virNetworkObjPtr
@@ -2024,6 +2027,8 @@ networkStartNetwork(virNetworkDriverStatePtr driver,
          */
         if (hookret < 0)
             goto cleanup;
+
+        networkNetworkObjTaint(network, VIR_NETWORK_TAINT_HOOK);
     }
 
     switch (network->def->forward.type) {
@@ -2067,6 +2072,8 @@ networkStartNetwork(virNetworkDriverStatePtr driver,
          */
         if (hookret < 0)
             goto cleanup;
+
+        networkNetworkObjTaint(network, VIR_NETWORK_TAINT_HOOK);
     }
 
     network->active = 1;
@@ -3649,6 +3656,8 @@ validate:
          */
         if (hookret < 0)
             goto error;
+
+        networkNetworkObjTaint(network, VIR_NETWORK_TAINT_HOOK);
     }
 
     if (dev) {
@@ -4023,6 +4032,8 @@ success:
                     VIR_HOOK_NETWORK_OP_IFACE_UNPLUGGED,
                     VIR_HOOK_SUBOP_BEGIN, NULL, xml, NULL);
         VIR_FREE(xml);
+
+        networkNetworkObjTaint(network, VIR_NETWORK_TAINT_HOOK);
     }
 
     VIR_DEBUG("Releasing network %s, %d connections",
@@ -4359,3 +4370,18 @@ networkUnplugBandwidth(virNetworkObjPtr net,
 cleanup:
     return ret;
 }
+
+static void
+networkNetworkObjTaint(virNetworkObjPtr net,
+                       enum virNetworkTaintFlags taint)
+{
+    if (virNetworkObjTaint(net, taint)) {
+        char uuidstr[VIR_UUID_STRING_BUFLEN];
+        virUUIDFormat(net->def->uuid, uuidstr);
+
+        VIR_WARN("Network name='%s' uuid=%s is tainted: %s",
+                 net->def->name,
+                 uuidstr,
+                 virNetworkTaintTypeToString(taint));
+    }
+}
-- 
1.8.5.2

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