From 018fd697b6a98230d007c2c729bdd2688c218ff6 Mon Sep 17 00:00:00 2001 From: Stefan Berger Date: Mon, 3 May 2010 18:14:58 -0400 Subject: [PATCH] nwfilter: skip some interfaces on filter update When a filter is updated, only those interfaces must have their old rules cleared that either reference the filter directly or indirectly through another filter. Remember between the different steps of the instantiation of the filters which interfaces must be skipped. I am using a hash map to remember the names of the interfaces and store a bogus pointer to ~0 into it that need not be freed. --- src/conf/nwfilter_conf.c | 8 ++++ src/conf/nwfilter_conf.h | 1 + src/nwfilter/nwfilter_gentech_driver.c | 66 +++++++++++++++++++------- src/nwfilter/nwfilter_gentech_driver.h | 3 +- 4 files changed, 59 insertions(+), 19 deletions(-) diff --git a/src/conf/nwfilter_conf.c b/src/conf/nwfilter_conf.c index a8a6a78ab6..ea73a33e0f 100644 --- a/src/conf/nwfilter_conf.c +++ b/src/conf/nwfilter_conf.c @@ -2088,8 +2088,14 @@ virNWFilterTriggerVMFilterRebuild(virConnectPtr conn) .conn = conn, .err = 0, .step = STEP_APPLY_NEW, + .skipInterfaces = virHashCreate(0), }; + if (!cb.skipInterfaces) { + virReportOOMError(); + return 1; + } + for (i = 0; i < nCallbackDriver; i++) { callbackDrvArray[i]->vmFilterRebuild(conn, virNWFilterDomainFWUpdateCB, @@ -2115,6 +2121,8 @@ virNWFilterTriggerVMFilterRebuild(virConnectPtr conn) &cb); } + virHashFree(cb.skipInterfaces, NULL); + return err; } diff --git a/src/conf/nwfilter_conf.h b/src/conf/nwfilter_conf.h index 3aef3fb110..b7b62adc33 100644 --- a/src/conf/nwfilter_conf.h +++ b/src/conf/nwfilter_conf.h @@ -471,6 +471,7 @@ struct domUpdateCBStruct { virConnectPtr conn; enum UpdateStep step; int err; + virHashTablePtr skipInterfaces; }; diff --git a/src/nwfilter/nwfilter_gentech_driver.c b/src/nwfilter/nwfilter_gentech_driver.c index 515d381a18..494637354e 100644 --- a/src/nwfilter/nwfilter_gentech_driver.c +++ b/src/nwfilter/nwfilter_gentech_driver.c @@ -316,7 +316,7 @@ _virNWFilterInstantiateRec(virConnectPtr conn, virNWFilterHashTablePtr vars, int *nEntries, virNWFilterRuleInstPtr **insts, - enum instCase useNewFilter, int *foundNewFilter, + enum instCase useNewFilter, bool *foundNewFilter, virNWFilterDriverStatePtr driver) { virNWFilterPoolObjPtr obj; @@ -381,7 +381,7 @@ _virNWFilterInstantiateRec(virConnectPtr conn, case INSTANTIATE_FOLLOW_NEWFILTER: if (obj->newDef) { next_filter = obj->newDef; - *foundNewFilter = 1; + *foundNewFilter = true; } break; case INSTANTIATE_ALWAYS: @@ -562,7 +562,7 @@ virNWFilterInstantiate(virConnectPtr conn, int ifindex, const char *linkdev, virNWFilterHashTablePtr vars, - enum instCase useNewFilter, int *foundNewFilter, + enum instCase useNewFilter, bool *foundNewFilter, bool teardownOld, const unsigned char *macaddr, virNWFilterDriverStatePtr driver, @@ -693,7 +693,8 @@ __virNWFilterInstantiateFilter(virConnectPtr conn, virNWFilterHashTablePtr filterparams, enum instCase useNewFilter, virNWFilterDriverStatePtr driver, - bool forceWithPendingReq) + bool forceWithPendingReq, + bool *foundNewFilter) { int rc; const char *drvname = EBIPTABLES_DRIVER_ID; @@ -702,7 +703,6 @@ __virNWFilterInstantiateFilter(virConnectPtr conn, virNWFilterHashTablePtr vars, vars1; virNWFilterDefPtr filter; char vmmacaddr[VIR_MAC_STRING_BUFLEN] = {0}; - int foundNewFilter = 0; char *str_macaddr = NULL; const char *ipaddr; char *str_ipaddr = NULL; @@ -775,7 +775,7 @@ __virNWFilterInstantiateFilter(virConnectPtr conn, case INSTANTIATE_FOLLOW_NEWFILTER: if (obj->newDef) { filter = obj->newDef; - foundNewFilter = 1; + *foundNewFilter = true; } break; @@ -791,7 +791,7 @@ __virNWFilterInstantiateFilter(virConnectPtr conn, ifindex, linkdev, vars, - useNewFilter, &foundNewFilter, + useNewFilter, foundNewFilter, teardownOld, macaddr, driver, @@ -816,7 +816,8 @@ static int _virNWFilterInstantiateFilter(virConnectPtr conn, const virDomainNetDefPtr net, bool teardownOld, - enum instCase useNewFilter) + enum instCase useNewFilter, + bool *foundNewFilter) { const char *linkdev = (net->type == VIR_DOMAIN_NET_TYPE_DIRECT) ? net->data.direct.linkdev @@ -837,7 +838,8 @@ _virNWFilterInstantiateFilter(virConnectPtr conn, net->filterparams, useNewFilter, conn->nwfilterPrivateData, - false); + false, + foundNewFilter); } @@ -853,6 +855,8 @@ virNWFilterInstantiateFilterLate(virConnectPtr conn, virNWFilterDriverStatePtr driver) { int rc; + bool foundNewFilter = false; + rc = __virNWFilterInstantiateFilter(conn, 1, ifname, @@ -864,7 +868,8 @@ virNWFilterInstantiateFilterLate(virConnectPtr conn, filterparams, INSTANTIATE_ALWAYS, driver, - true); + true, + &foundNewFilter); if (rc) { //something went wrong... 'DOWN' the interface if (ifaceCheck(false, ifname, NULL, ifindex) != 0 || @@ -881,19 +886,29 @@ int virNWFilterInstantiateFilter(virConnectPtr conn, const virDomainNetDefPtr net) { + bool foundNewFilter = false; + return _virNWFilterInstantiateFilter(conn, net, 1, - INSTANTIATE_ALWAYS); + INSTANTIATE_ALWAYS, + &foundNewFilter); } int virNWFilterUpdateInstantiateFilter(virConnectPtr conn, - const virDomainNetDefPtr net) + const virDomainNetDefPtr net, + bool *skipIface) { - return _virNWFilterInstantiateFilter(conn, net, - 0, - INSTANTIATE_FOLLOW_NEWFILTER); + bool foundNewFilter = false; + + int rc = _virNWFilterInstantiateFilter(conn, net, + 0, + INSTANTIATE_FOLLOW_NEWFILTER, + &foundNewFilter); + + *skipIface = !foundNewFilter; + return rc; } int virNWFilterRollbackUpdateFilter(virConnectPtr conn, @@ -993,6 +1008,7 @@ virNWFilterDomainFWUpdateCB(void *payload, virDomainDefPtr vm = obj->def; struct domUpdateCBStruct *cb = data; int i; + bool skipIface; virDomainObjLock(obj); @@ -1003,15 +1019,29 @@ virNWFilterDomainFWUpdateCB(void *payload, switch (cb->step) { case STEP_APPLY_NEW: cb->err = virNWFilterUpdateInstantiateFilter(cb->conn, - net); + net, + &skipIface); + if (cb->err == 0 && skipIface == true) { + // filter tree unchanged -- no update needed + cb->err = virHashAddEntry(cb->skipInterfaces, + net->ifname, + (void *)~0); + if (cb->err) + virReportOOMError(); + } break; case STEP_TEAR_NEW: - cb->err = virNWFilterRollbackUpdateFilter(cb->conn, net); + if ( !virHashLookup(cb->skipInterfaces, net->ifname)) { + cb->err = virNWFilterRollbackUpdateFilter(cb->conn, + net); + } break; case STEP_TEAR_OLD: - cb->err = virNWFilterTearOldFilter(cb->conn, net); + if ( !virHashLookup(cb->skipInterfaces, net->ifname)) { + cb->err = virNWFilterTearOldFilter(cb->conn, net); + } break; } if (cb->err) diff --git a/src/nwfilter/nwfilter_gentech_driver.h b/src/nwfilter/nwfilter_gentech_driver.h index 646a558d29..7328c516e3 100644 --- a/src/nwfilter/nwfilter_gentech_driver.h +++ b/src/nwfilter/nwfilter_gentech_driver.h @@ -40,7 +40,8 @@ enum instCase { int virNWFilterInstantiateFilter(virConnectPtr conn, const virDomainNetDefPtr net); int virNWFilterUpdateInstantiateFilter(virConnectPtr conn, - const virDomainNetDefPtr net); + const virDomainNetDefPtr net, + bool *skipIface); int virNWFilterRollbackUpdateFilter(virConnectPtr conn, const virDomainNetDefPtr net);