ip层的处理流程

1、04095:0100;5tati匚int_initpacketjnitfvoidi04101：01102:intrc-proto_register(p<tcket_protOf匚)；04103:04104：if匕匚！=o)0-4105:gotolout;oioe：酬uiu/:sockregister(日世血一op引；_'41_8:register_pernet_su&/?q匸后:(_打啟_0卩3)；0109：register_netdevice_notifiert_nctdev_notfffer);04110：O<lt：04mrerurnrc;04112：01113

2、:staticconststructnet_proto_familyJ債耳希TtICl莎.family=PF.PACKET,.create=packet_create,.owner=THIS.MODULE,；staticinipaeket_create：sirucinetiielfstructsuck,itprotocol,【ntkern)structwckFit：sinjetpackCsockpo；_belfjproto=(forte_be16)protocol;/vweirdrbut:documented*/interr;if('ns_capable(ncr>iner_nsf

3、CAP_NET_RAW)return-EPERM；rftsock->typeI二SOCK_DGRAM&8lsock->typeI=SDCK_RAW(Uksock->typeJ=SOCICPACKET)return-ESOCKTNOSUPPORT;sock->5tate=鉛UNCONNECTED;err二-ENOBUFS；sk=sk_allocnet,P1=_PACKET,GFP_KERNEL,ApacireCproro);if(sk=NULL)gotoJout;sotk->cps=&fidcJretops',H(sock->type=

4、SOCK_PACKET)sock>ops=packet_ops_spkt;|sock_iriit_datijsock,sk);pc=pktsk(sk);sk->sk_tamily-Pl-_PACKLT;po->num=proto;|jc->xrnlt=dev_queue_xniii;err=packet_alk)c_pending(po);if伽)goto;staticconststructprota_opeJamriy=PF_PACKETX.owner=TH!s_MODULE,.release=packet_release,.bind=packet_bindF.con

5、nect=socnoonnect,-socketpair=sock_另ockEtpbir,.accept=sock_no_acceptx,getname=packet_getname,.poll=packet_pollr.icMztl=packet_iocti,.listen二sockjojisten,.shutdown=sock_no_£hutdownf.setsockopt=packet_setsockopt,.getsockopt=packet_getsockopty.SAndmsg=packet_sendm&gfTecvmsg=packet_recvmsgf.mmap

6、=packet_nwnapf.sendpage=&ock_no_sendpagefF面来看看：staticstructinet_protogwinetsw_array=-一-type=SOCKSTREAM,.protocol=IPPROTO.TCPj_prot=tcp_pratf-ops=&i«etstreamopst.flags=INET_PROTOSVV_PERMANENT|INETPROTOSWJCSK,*name.owner.close.connect*discon门启匚t_匚匕-mtureduced.hash.unhash,get_port-enter_me

7、mory_pressure.stream_memory_free.sockets_aIlocated=.orphan_count*.sys匚tl_wrn已m.sys#ifdeftfONFTG_COMPAT.compat_setsockopt.romnataptsnrkontstructprotoPnffWTffln="TCP11二thisJmodule,=tcp_doseftcp._v4_connect,=tcp_disconnect,=iri皂t_csk_acceptf-tcp_ioctl,tcp_v4_init_sockTtcp_v4_destroy_sock,-tcp-Shut

8、down,=tcp_setsockopt,=tcp_getsockoptftcp_recvmsg,tcp_sendmsg,=tcp_sendpage,=tcp_v4_do_rev,=tcpreleasecb,=tcp_v4_mtu_reducedf=inet-hash,=inet_unhash,inet_csk_gexport,-tep-enter-memory-pressure,j=tcp_strearn_memory_free,sockts_allocatedf&orphan_count,memory_ailocated,&Wp_memory_pressuretsysctl

9、_tcp_menirsysctl_tcp_wmem,sysctl_tcp_rmem,MAX_TCPJHEADERf=sizeof(structtcp_sock)f=SLABDESTROYBYRCU,=&tcp_timewait_sock_opst=Sitcp-request-sock-ops,&tcp_hashinfoftrue,=compat_tcp_setsockopt,=rnmnartrnnetsnrknnr.Prot是prototcp_prot在connect的时候，会调用tcp_v4_connect.yhlinet_hash_conneet(iirucL11m廿Iie

10、wdit_dedLhuwydealli_rowfstructso匚UdreturnirielJiasli-CoiinecLfdealh-rowskfinel_ik_port_uffset(sk)finet-Lheck-eUablislied,inei_tiaUi_nolisten);met_stream_opsconststructproto_ops=PFJNET,=THIS.MODULE,inet_release,=inebind,inet-Stream-Connect,=sock_no_socketpairT=inet_acceptfinet-getname,tcp_poll,=inet_

11、ioctL=inet_listenr=inet-Shutdown,=s©ck_commosetsocko卩t,=sock-common-getsockoptinet-sendmsg,inet_recvmsg,=sock-HO-mmapj=inet_seHdpagef二tcp_splice_read,xonnec±Joctiisten.shutdown+setso匚kopt,getsockopt.sendmsg,recvmsg,mmap.sendpage+splice_readxonnec±Joctiisten.shutdown+setso匚kopt,getsockopt.sendmsg,recvmsg,mmap.sendpage+splice_read#i