This patch adds support for filtering of STP (spanning tree protocol) traffic to the parser and makes us of the ebtables support for STP filtering. This code now enables the filtering of traffic in chains with prefix 'stp'. Signed-off-by: Stefan Berger --- docs/schemas/nwfilter.rng | 154 +++++++++++++++++++++++++ src/conf/nwfilter_conf.c | 178 ++++++++++++++++++++++++++++++ src/conf/nwfilter_conf.h | 41 ++++++ src/libvirt_private.syms | 1 src/nwfilter/nwfilter_ebiptables_driver.c | 90 +++++++++++++++ 5 files changed, 461 insertions(+), 3 deletions(-) Index: libvirt-acl/src/conf/nwfilter_conf.c =================================================================== --- libvirt-acl.orig/src/conf/nwfilter_conf.c +++ libvirt-acl/src/conf/nwfilter_conf.c @@ -84,6 +84,7 @@ VIR_ENUM_IMPL(virNWFilterChainSuffix, VI "root", "mac", "vlan", + "stp", "arp", "rarp", "ipv4", @@ -93,6 +94,7 @@ VIR_ENUM_IMPL(virNWFilterRuleProtocol, V "none", "mac", "vlan", + "stp", "arp", "rarp", "ip", @@ -1047,6 +1049,136 @@ static const virXMLAttr2Struct vlanAttri } }; +static const virXMLAttr2Struct stpAttributes[] = { + /* spanning tree uses a special destination MAC address */ + { + .name = SRCMACADDR, + .datatype = DATATYPE_MACADDR, + .dataIdx = offsetof(virNWFilterRuleDef, + p.stpHdrFilter.ethHdr.dataSrcMACAddr), + }, + { + .name = SRCMACMASK, + .datatype = DATATYPE_MACMASK, + .dataIdx = offsetof(virNWFilterRuleDef, + p.stpHdrFilter.ethHdr.dataSrcMACMask), + }, + { + .name = "type", + .datatype = DATATYPE_UINT8 | DATATYPE_UINT8_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataType), + }, + { + .name = "flags", + .datatype = DATATYPE_UINT8 | DATATYPE_UINT8_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataFlags), + }, + { + .name = "root-priority", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataRootPri), + }, + { + .name = "root-priority-hi", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataRootPriHi), + }, + { + .name = "root-address", + .datatype = DATATYPE_MACADDR, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataRootAddr), + }, + { + .name = "root-address-mask", + .datatype = DATATYPE_MACMASK, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataRootAddrMask), + }, + { + .name = "root-cost", + .datatype = DATATYPE_UINT32 | DATATYPE_UINT32_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataRootCost), + }, + { + .name = "root-cost-hi", + .datatype = DATATYPE_UINT32 | DATATYPE_UINT32_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataRootCostHi), + }, + { + .name = "sender-priority", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataSndrPrio), + }, + { + .name = "sender-priority-hi", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataSndrPrioHi), + }, + { + .name = "sender-address", + .datatype = DATATYPE_MACADDR, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataSndrAddr), + }, + { + .name = "sender-address-mask", + .datatype = DATATYPE_MACMASK, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataSndrAddrMask), + }, + { + .name = "port", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataPort), + }, + { + .name = "port-hi", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataPortHi), + }, + { + .name = "age", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataAge), + }, + { + .name = "age-hi", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataAgeHi), + }, + { + .name = "max-age", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataMaxAge), + }, + { + .name = "max-age-hi", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataMaxAgeHi), + }, + { + .name = "hello-time", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataHelloTime), + }, + { + .name = "hello-time-hi", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataHelloTimeHi), + }, + { + .name = "forward-delay", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataFwdDelay), + }, + { + .name = "forward-delay-hi", + .datatype = DATATYPE_UINT16 | DATATYPE_UINT16_HEX, + .dataIdx = offsetof(virNWFilterRuleDef, p.stpHdrFilter.dataFwdDelayHi), + }, + COMMENT_PROP(stpHdrFilter), + { + .name = NULL, + } +}; + static const virXMLAttr2Struct arpAttributes[] = { COMMON_MAC_PROPS(arpHdrFilter), { @@ -1505,6 +1637,7 @@ static const virAttributes virAttr[] = { PROTOCOL_ENTRY("rarp" , arpAttributes , VIR_NWFILTER_RULE_PROTOCOL_RARP), PROTOCOL_ENTRY("mac" , macAttributes , VIR_NWFILTER_RULE_PROTOCOL_MAC), PROTOCOL_ENTRY("vlan" , vlanAttributes , VIR_NWFILTER_RULE_PROTOCOL_VLAN), + PROTOCOL_ENTRY("stp" , stpAttributes , VIR_NWFILTER_RULE_PROTOCOL_STP), PROTOCOL_ENTRY("ip" , ipAttributes , VIR_NWFILTER_RULE_PROTOCOL_IP), PROTOCOL_ENTRY("ipv6" , ipv6Attributes , VIR_NWFILTER_RULE_PROTOCOL_IPV6), PROTOCOL_ENTRY("tcp" , tcpAttributes , VIR_NWFILTER_RULE_PROTOCOL_TCP), @@ -1628,6 +1761,18 @@ virNWFilterRuleDetailsParse(xmlNodePtr n rc = -1; break; + case DATATYPE_UINT32_HEX: + base = 16; + /* fallthrough */ + case DATATYPE_UINT32: + if (virStrToLong_ui(prop, NULL, base, &uint_val) >= 0) { + item->u.u32 = uint_val; + found = 1; + data.ui = uint_val; + } else + rc = -1; + break; + case DATATYPE_IPADDR: if (virSocketParseIpv4Addr(prop, &item->u.ipaddr) < 0) @@ -1841,6 +1986,31 @@ virNWFilterRuleDefFixup(virNWFilterRuleD rule->p.vlanHdrFilter.ethHdr.dataDstMACAddr); break; + case VIR_NWFILTER_RULE_PROTOCOL_STP: + COPY_NEG_SIGN(rule->p.stpHdrFilter.ethHdr.dataSrcMACMask, + rule->p.stpHdrFilter.ethHdr.dataSrcMACAddr); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataRootPriHi, + rule->p.stpHdrFilter.dataRootPri); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataRootAddrMask, + rule->p.stpHdrFilter.dataRootAddr); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataRootCostHi, + rule->p.stpHdrFilter.dataRootCost); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataSndrPrioHi, + rule->p.stpHdrFilter.dataSndrPrio); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataSndrAddrMask, + rule->p.stpHdrFilter.dataSndrAddr); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataPortHi, + rule->p.stpHdrFilter.dataPort); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataAgeHi, + rule->p.stpHdrFilter.dataAge); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataMaxAgeHi, + rule->p.stpHdrFilter.dataMaxAge); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataHelloTimeHi, + rule->p.stpHdrFilter.dataHelloTime); + COPY_NEG_SIGN(rule->p.stpHdrFilter.dataFwdDelayHi, + rule->p.stpHdrFilter.dataFwdDelay); + break; + case VIR_NWFILTER_RULE_PROTOCOL_IP: COPY_NEG_SIGN(rule->p.ipHdrFilter.ipHdr.dataSrcIPMask, rule->p.ipHdrFilter.ipHdr.dataSrcIPAddr); @@ -2979,6 +3149,14 @@ virNWFilterRuleDefDetailsFormat(virBuffe item->u.u16); break; + case DATATYPE_UINT32_HEX: + asHex = true; + /* fallthrough */ + case DATATYPE_UINT32: + virBufferAsprintf(buf, asHex ? "0x%x" : "%d", + item->u.u32); + break; + case DATATYPE_IPADDR: case DATATYPE_IPV6ADDR: virNWIPAddressFormat(buf, Index: libvirt-acl/src/conf/nwfilter_conf.h =================================================================== --- libvirt-acl.orig/src/conf/nwfilter_conf.h +++ libvirt-acl/src/conf/nwfilter_conf.h @@ -101,10 +101,14 @@ enum attrDatatype { DATATYPE_IPV6MASK = (1 << 10), DATATYPE_STRINGCOPY = (1 << 11), DATATYPE_BOOLEAN = (1 << 12), + DATATYPE_UINT32 = (1 << 13), + DATATYPE_UINT32_HEX = (1 << 14), - DATATYPE_LAST = (1 << 13), + DATATYPE_LAST = (1 << 15), }; +# define NWFILTER_MAC_BGA "01:80:c2:00:00:00" + typedef struct _nwMACAddress nwMACAddress; typedef nwMACAddress *nwMACAddressPtr; @@ -125,6 +129,7 @@ struct _nwItemDesc { bool boolean; uint8_t u8; uint16_t u16; + uint32_t u32; char protocolID[10]; char *string; struct { @@ -164,6 +169,36 @@ struct _vlanHdrFilterDef { }; +typedef struct _stpHdrFilterDef stpHdrFilterDef; +typedef stpHdrFilterDef *stpHdrFilterDefPtr; +struct _stpHdrFilterDef { + ethHdrDataDef ethHdr; + nwItemDesc dataType; + nwItemDesc dataFlags; + nwItemDesc dataRootPri; + nwItemDesc dataRootPriHi; + nwItemDesc dataRootAddr; + nwItemDesc dataRootAddrMask; + nwItemDesc dataRootCost; + nwItemDesc dataRootCostHi; + nwItemDesc dataSndrPrio; + nwItemDesc dataSndrPrioHi; + nwItemDesc dataSndrAddr; + nwItemDesc dataSndrAddrMask; + nwItemDesc dataPort; + nwItemDesc dataPortHi; + nwItemDesc dataAge; + nwItemDesc dataAgeHi; + nwItemDesc dataMaxAge; + nwItemDesc dataMaxAgeHi; + nwItemDesc dataHelloTime; + nwItemDesc dataHelloTimeHi; + nwItemDesc dataFwdDelay; + nwItemDesc dataFwdDelayHi; + nwItemDesc dataComment; +}; + + typedef struct _arpHdrFilterDef arpHdrFilterDef; typedef arpHdrFilterDef *arpHdrFilterDefPtr; struct _arpHdrFilterDef { @@ -337,6 +372,7 @@ enum virNWFilterRuleProtocolType { VIR_NWFILTER_RULE_PROTOCOL_NONE = 0, VIR_NWFILTER_RULE_PROTOCOL_MAC, VIR_NWFILTER_RULE_PROTOCOL_VLAN, + VIR_NWFILTER_RULE_PROTOCOL_STP, VIR_NWFILTER_RULE_PROTOCOL_ARP, VIR_NWFILTER_RULE_PROTOCOL_RARP, VIR_NWFILTER_RULE_PROTOCOL_IP, @@ -378,6 +414,7 @@ enum virNWFilterEbtablesTableType { # define NWFILTER_MAX_FILTER_PRIORITY MAX_RULE_PRIORITY # define NWFILTER_ROOT_FILTER_PRI 0 +# define NWFILTER_STP_FILTER_PRI -810 # define NWFILTER_MAC_FILTER_PRI -800 # define NWFILTER_VLAN_FILTER_PRI -750 # define NWFILTER_IPV4_FILTER_PRI -700 @@ -418,6 +455,7 @@ struct _virNWFilterRuleDef { union { ethHdrFilterDef ethHdrFilter; vlanHdrFilterDef vlanHdrFilter; + stpHdrFilterDef stpHdrFilter; arpHdrFilterDef arpHdrFilter; /* also used for rarp */ ipHdrFilterDef ipHdrFilter; ipv6HdrFilterDef ipv6HdrFilter; @@ -459,6 +497,7 @@ enum virNWFilterChainSuffixType { VIR_NWFILTER_CHAINSUFFIX_ROOT = 0, VIR_NWFILTER_CHAINSUFFIX_MAC, VIR_NWFILTER_CHAINSUFFIX_VLAN, + VIR_NWFILTER_CHAINSUFFIX_STP, VIR_NWFILTER_CHAINSUFFIX_ARP, VIR_NWFILTER_CHAINSUFFIX_RARP, VIR_NWFILTER_CHAINSUFFIX_IPv4, 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 @@ -179,6 +179,7 @@ enum l3_proto_idx { L3_PROTO_RARP_IDX, L2_PROTO_MAC_IDX, L2_PROTO_VLAN_IDX, + L2_PROTO_STP_IDX, L3_PROTO_LAST_IDX }; @@ -190,6 +191,7 @@ static const struct ushort_map l3_protoc USHORTMAP_ENTRY_IDX(L3_PROTO_ARP_IDX , ETHERTYPE_ARP , "arp"), USHORTMAP_ENTRY_IDX(L3_PROTO_RARP_IDX, ETHERTYPE_REVARP, "rarp"), USHORTMAP_ENTRY_IDX(L2_PROTO_VLAN_IDX, ETHERTYPE_VLAN , "vlan"), + USHORTMAP_ENTRY_IDX(L2_PROTO_STP_IDX, 0 , "stp"), USHORTMAP_ENTRY_IDX(L2_PROTO_MAC_IDX, 0 , "mac"), USHORTMAP_ENTRY_IDX(L3_PROTO_LAST_IDX, 0 , NULL), }; @@ -290,6 +292,16 @@ _printDataType(virNWFilterVarCombIterPtr } break; + case DATATYPE_UINT32: + case DATATYPE_UINT32_HEX: + if (snprintf(buf, bufsize, asHex ? "0x%x" : "%d", + item->u.u32) >= bufsize) { + virNWFilterReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Buffer too small for uint32 type")); + return 1; + } + break; + case DATATYPE_UINT16: case DATATYPE_UINT16_HEX: if (snprintf(buf, bufsize, asHex ? "0x%x" : "%d", @@ -2012,10 +2024,82 @@ ebtablesCreateRuleInstance(char chainPre number); \ } +#define INST_ITEM_2PARMS(STRUCT, ITEM, ITEM_HI, CLI, SEP) \ + if (HAS_ENTRY_ITEM(&rule->p.STRUCT.ITEM)) { \ + if (printDataType(vars, \ + number, sizeof(number), \ + &rule->p.STRUCT.ITEM)) \ + goto err_exit; \ + virBufferAsprintf(&buf, \ + " " CLI " %s %s", \ + ENTRY_GET_NEG_SIGN(&rule->p.STRUCT.ITEM), \ + number); \ + if (HAS_ENTRY_ITEM(&rule->p.STRUCT.ITEM_HI)) { \ + if (printDataType(vars, \ + number, sizeof(number), \ + &rule->p.STRUCT.ITEM_HI)) \ + goto err_exit; \ + virBufferAsprintf(&buf, SEP "%s", number); \ + } \ + } +#define INST_ITEM_RANGE(S, I, I_HI, C) \ + INST_ITEM_2PARMS(S, I, I_HI, C, ":") +#define INST_ITEM_MASK(S, I, MASK, C) \ + INST_ITEM_2PARMS(S, I, MASK, C, "/") + INST_ITEM(vlanHdrFilter, dataVlanID, "--vlan-id") INST_ITEM(vlanHdrFilter, dataVlanEncap, "--vlan-encap") break; + case VIR_NWFILTER_RULE_PROTOCOL_STP: + + /* cannot handle inout direction with srcmask set in reverse dir. + since this clashes with -d below... */ + if (reverse && + HAS_ENTRY_ITEM(&rule->p.stpHdrFilter.ethHdr.dataSrcMACAddr)) { + virNWFilterReportError(VIR_ERR_INTERNAL_ERROR, + _("STP filtering in %s direction with " + "source MAC address set is not supported"), + virNWFilterRuleDirectionTypeToString( + VIR_NWFILTER_RULE_DIRECTION_INOUT)); + return -1; + } + + virBufferAsprintf(&buf, + CMD_DEF_PRE "%s -t %s -%%c %s %%s", + ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain); + + + if (ebtablesHandleEthHdr(&buf, + vars, + &rule->p.stpHdrFilter.ethHdr, + reverse)) + goto err_exit; + + virBufferAddLit(&buf, " -d " NWFILTER_MAC_BGA); + + INST_ITEM(stpHdrFilter, dataType, "--stp-type") + INST_ITEM(stpHdrFilter, dataFlags, "--stp-flags") + INST_ITEM_RANGE(stpHdrFilter, dataRootPri, dataRootPriHi, + "--stp-root-pri"); + INST_ITEM_MASK( stpHdrFilter, dataRootAddr, dataRootAddrMask, + "--stp-root-addr"); + INST_ITEM_RANGE(stpHdrFilter, dataRootCost, dataRootCostHi, + "--stp-root-cost"); + INST_ITEM_RANGE(stpHdrFilter, dataSndrPrio, dataSndrPrioHi, + "--stp-sender-prio"); + INST_ITEM_MASK( stpHdrFilter, dataSndrAddr, dataSndrAddrMask, + "--stp-sender-addr"); + INST_ITEM_RANGE(stpHdrFilter, dataPort, dataPortHi, "--stp-port"); + INST_ITEM_RANGE(stpHdrFilter, dataAge, dataAgeHi, "--stp-msg-age"); + INST_ITEM_RANGE(stpHdrFilter, dataMaxAge, dataMaxAgeHi, + "--stp-max-age"); + INST_ITEM_RANGE(stpHdrFilter, dataHelloTime, dataHelloTimeHi, + "--stp-hello-time"); + INST_ITEM_RANGE(stpHdrFilter, dataFwdDelay, dataFwdDelayHi, + "--stp-forward-delay"); + break; + case VIR_NWFILTER_RULE_PROTOCOL_ARP: case VIR_NWFILTER_RULE_PROTOCOL_RARP: @@ -2464,6 +2548,7 @@ ebiptablesCreateRuleInstance(virConnectP case VIR_NWFILTER_RULE_PROTOCOL_IP: case VIR_NWFILTER_RULE_PROTOCOL_MAC: case VIR_NWFILTER_RULE_PROTOCOL_VLAN: + case VIR_NWFILTER_RULE_PROTOCOL_STP: case VIR_NWFILTER_RULE_PROTOCOL_ARP: case VIR_NWFILTER_RULE_PROTOCOL_RARP: case VIR_NWFILTER_RULE_PROTOCOL_NONE: @@ -2907,7 +2992,7 @@ ebtablesCreateTmpSubChain(ebiptablesRule char rootchain[MAX_CHAINNAME_LENGTH], chain[MAX_CHAINNAME_LENGTH]; char chainPrefix = (incoming) ? CHAINPREFIX_HOST_IN_TEMP : CHAINPREFIX_HOST_OUT_TEMP; - char protostr[16] = { 0, }; + char protostr[32] = { 0, }; PRINT_ROOT_CHAIN(rootchain, chainPrefix, ifname); PRINT_CHAIN(chain, chainPrefix, ifname, @@ -2916,6 +3001,9 @@ ebtablesCreateTmpSubChain(ebiptablesRule switch (protoidx) { case L2_PROTO_MAC_IDX: break; + case L2_PROTO_STP_IDX: + snprintf(protostr, sizeof(protostr), "-d " NWFILTER_MAC_BGA); + break; default: snprintf(protostr, sizeof(protostr), "-p 0x%04x ", l3_protocols[protoidx].attr); Index: libvirt-acl/docs/schemas/nwfilter.rng =================================================================== --- libvirt-acl.orig/docs/schemas/nwfilter.rng +++ libvirt-acl/docs/schemas/nwfilter.rng @@ -40,6 +40,16 @@ + + + + + + + + + + @@ -300,6 +310,9 @@ mac[a-zA-Z0-9_\.:-]* + stp[a-zA-Z0-9_\.:-]* + + vlan[a-zA-Z0-9_\.:-]* @@ -384,7 +397,7 @@ - + @@ -392,6 +405,12 @@ + + + + + + @@ -590,6 +609,121 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + @@ -854,6 +988,24 @@ + + + + + $[a-zA-Z0-9_]+ + + + + 0x[0-9a-fA-F]{1,8} + + + + 0 + 4294967295 + + + + yes Index: libvirt-acl/src/libvirt_private.syms =================================================================== --- libvirt-acl.orig/src/libvirt_private.syms +++ libvirt-acl/src/libvirt_private.syms @@ -874,6 +874,7 @@ virNWFilterPrintStateMatchFlags; virNWFilterPrintTCPFlags; virNWFilterRegisterCallbackDriver; virNWFilterRuleActionTypeToString; +virNWFilterRuleDirectionTypeToString; virNWFilterRuleProtocolTypeToString; virNWFilterTestUnassignDef; virNWFilterUnlockFilterUpdates;