Understanding and Programming with Netlink Sockets

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1、UnderstandingAndProgrammingWithNetlinkSocketsNeilHormanVersion0.3December6,20041Contents1Introduction32TheNetlinkAddressFamily42.1SocketCreation..........................42.2SendingandReceivingDatagrams................42.3TheNetlinkSocketAddressStructure.

2、............53TheNetlinkMessageFormat73.1TheNetlinkHeader........................73.2NetlinkUtilityMacros......................93.3AVisualOverview........................104TheNETLINKFIREWALLprotocol114.1CreationandUse.........................114.2Message

3、Types..........................124.2.1IPQMMODE.......................124.2.2IPQMPACKET.....................134.2.3IPQMVERDICT.....................144.3ExampleuseoftheNETLINKFILTERprotocol........165TheNETLINKROUTEProtocol185.1CreationandUse...............

4、..........185.2theNETLINKROUTEmessagemacros............185.3AnotherVisualOverview.....................195.4MessageTypes..........................195.4.1TheLINKmessages...................205.4.2TheADDRmessages...................215.4.3TheROUTEmessages.....

5、.............235.4.4TheNEIGHmessages..................245.4.5TheRULEmessages...................245.4.6TheQDISCmessages...................245.4.7TheCLASSmessages...................245.4.8TheFILTERmessages..................246AddingNetlinkProtocolsintheKern

6、el251ListofFigures1Netlinkmessagelayoutandnetlinkmacrointeraction.....102Netlinkrouteprotocolmessagelayoutandmacrointeraction.2021IntroductionNetworkconfigurationinLinux,andinvariousimplementationsofUnixingeneral,hasalwaysbeensomethingofanafterthoughtfromt

7、heprogrammerspointofview.Addingroutes,neighbortableentries,orinterfaceconfigura-tionoptionsrequiredasomewhathaphazardcombinationofrawsockets,ioctlcallsandspecializedpseudo-networkprotocols.Inthe2.4Linuxker-nel,developersbegananefforttocreateamorestandardint

8、erfacefortheconfigurationofthenetworkcontrolplane1.Thisconfigurationinterfaceandprotocol,knownasnetlinksocketsaimstocreateacommunicationframe-worksuitableforsettingallaspectsofthenetworkcontrolplane.Whilethebuildoutof