ARP/ND entries for the same address on different interfaces (VPP-848) - vpp

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author	Neale Ranns <nranns@cisco.com>	2017-05-18 03:03:22 -0700
committer	Damjan Marion <dmarion.lists@gmail.com>	2017-05-23 09:48:52 +0000
commit	8142499cd1cb3b8d0168d0e6cf5309c5b4813cc4 (patch)
tree	b6191c8b7417aa3a6865ec8b90837d852b90b539 /test/doc
parent	f3b53643e87e7521c57cccc157385d2fa4bd0d80 (diff)

ARP/ND entries for the same address on different interfaces (VPP-848)

there are, intentionally, no validation checks in the ARP/ND code to prevent an ARP/ND entry from being installed for an address that is not local to the interface's sub-net. This is ok, since the adjacency/FIB code is designed to handle this case using the 'refinement' criteria - i.e. only installing a FIB entry for the address if the address 'refines' (i.e. is more specific than) the interface's sub-net. However, the refinement criteria currently operates on the FIB entry's prefix (which is a /32, so on the address) and not on the next-hop in the path. So, enter multiple ARP entries for the same address on different links, and this refinement criteria uses only the last added path, and so will remove the FIB entry should the ARP entries be added in the 'wrong' order. This fix updates the refinement criteria to work on each path of the FIB entry. The entry is installed if one of the paths refines the covers and only paths refining the cover contribute forwarding. Per-path refinement checks are stored in path-extensions. The patch is rather large as path-extension, which were previously used only for out-going MPLS labels, have been generalized. Change-Id: I00be359148cb948c32c52109e832a70537a7920a Signed-off-by: Neale Ranns <nranns@cisco.com>

Diffstat (limited to 'test/doc')

0 files changed, 0 insertions, 0 deletions

# Copyright (c) 2018 Cisco and/or its affiliates. # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at: # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. option(VPP_BUFFER_FAULT_INJECTOR "Include the buffer fault injector" OFF) ############################################################################## # Generate vlib/config.h ############################################################################## if(VPP_BUFFER_FAULT_INJECTOR) set(BUFFER_ALLOC_FAULT_INJECTOR 1 CACHE STRING "fault injector on") else() set(BUFFER_ALLOC_FAULT_INJECTOR 0 CACHE STRING "fault injector off") endif() set(PRE_DATA_SIZE 128 CACHE STRING "Buffer headroom size.") if (CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG") set(_ss 16) else() set(_ss 15) endif() set(VLIB_PROCESS_LOG2_STACK_SIZE ${_ss} CACHE STRING "Process node default stack size (log2)" ) configure_file( ${CMAKE_SOURCE_DIR}/vlib/config.h.in ${CMAKE_CURRENT_BINARY_DIR}/config.h ) install( FILES ${CMAKE_CURRENT_BINARY_DIR}/config.h DESTINATION include/vlib COMPONENT vpp-dev ) ############################################################################## # Find lib and include files ############################################################################## message(STATUS "Looking for libuuid") vpp_find_path(UUID_INCLUDE_DIR NAMES uuid/uuid.h) vpp_find_library(UUID_LIB NAMES uuid) if(UUID_INCLUDE_DIR AND UUID_LIB) include_directories(${UUID_INCLUDE_DIR}) set(VMBUS_SOURCE linux/vmbus.c) set(VMBUS_LIBS uuid) message(STATUS "Found uuid in ${UUID_INCLUDE_DIR}") else() message(WARNING "-- libuuid not found - vmbus support disabled") endif() ############################################################################## # vlib shared library ############################################################################## add_vpp_library(vlib SOURCES buffer.c buffer_funcs.c cli.c counter.c drop.c error.c format.c handoff_trace.c init.c linux/pci.c linux/vfio.c log.c main.c node.c node_cli.c node_format.c node_init.c pci/pci.c pci/pci_types_api.c physmem.c punt.c punt_node.c threads.c threads_cli.c trace.c unix/cli.c unix/input.c unix/main.c unix/plugin.c unix/util.c vmbus/vmbus.c ${VMBUS_SOURCE} MULTIARCH_SOURCES buffer_funcs.c drop.c punt_node.c node_init.c INSTALL_HEADERS buffer_funcs.h buffer.h buffer_node.h cli.h counter.h counter_types.h defs.h error_funcs.h error.h format_funcs.h global_funcs.h init.h linux/vfio.h log.h main.h node_funcs.h node.h pci/pci_config.h pci/pci.h pci/pci_types_api.h physmem_funcs.h physmem.h punt.h threads.h trace_funcs.h trace.h unix/mc_socket.h unix/plugin.h unix/unix.h vlib.h vmbus/vmbus.h API_FILES pci/pci_types.api LINK_LIBRARIES vppinfra svm ${VMBUS_LIBS} ${CMAKE_DL_LIBS} DEPENDS api_headers )


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