// SPDX-License-Identifier: GPL-2.0-or-later /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * This file implements the various access functions for the * PROC file system. It is mainly used for debugging and * statistics. * * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de> * Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de> * Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de> * * Fixes: * Alan Cox : UDP sockets show the rxqueue/txqueue * using hint flag for the netinfo. * Pauline Middelink : identd support * Alan Cox : Make /proc safer. * Erik Schoenfelder : /proc/net/snmp * Alan Cox : Handle dead sockets properly. * Gerhard Koerting : Show both timers * Alan Cox : Allow inode to be NULL (kernel socket) * Andi Kleen : Add support for open_requests and * split functions for more readibility. * Andi Kleen : Add support for /proc/net/netstat * Arnaldo C. Melo : Convert to seq_file #include <linux/types.h>#include <net/net_namespace.h>#include <net/icmp.h>#include <net/protocol.h>#include <net/tcp.h>#include <net/mptcp.h>#include <net/proto_memory.h>#include <net/udp.h>#include <net/udplite.h>#include <linux/bottom_half.h>#include <linux/inetdevice.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/export.h>#include <net/sock.h>#include <net/raw.h>#define TCPUDP_MIB_MAX MAX_T(u32, UDP_MIB_MAX, TCP_MIB_MAX)/* * Report socket allocation statistics [mea@utu.fi] static int sockstat_seq_show(struct seq_file *seq, void *v)struct net *net = seq->private ;int orphans, sockets;"TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n" ,"UDP: inuse %d mem %ld\n" ,"UDPLITE: inuse %d\n" ,"RAW: inuse %d\n" ,"FRAG: inuse %u memory %lu\n" ,return 0;/* snmp items */ static const struct snmp_mib snmp4_ipstats_list[] = {"InReceives" , IPSTATS_MIB_INPKTS),"InHdrErrors" , IPSTATS_MIB_INHDRERRORS),"InAddrErrors" , IPSTATS_MIB_INADDRERRORS),"ForwDatagrams" , IPSTATS_MIB_OUTFORWDATAGRAMS),"InUnknownProtos" , IPSTATS_MIB_INUNKNOWNPROTOS),"InDiscards" , IPSTATS_MIB_INDISCARDS),"InDelivers" , IPSTATS_MIB_INDELIVERS),"OutRequests" , IPSTATS_MIB_OUTREQUESTS),"OutDiscards" , IPSTATS_MIB_OUTDISCARDS),"OutNoRoutes" , IPSTATS_MIB_OUTNOROUTES),"ReasmTimeout" , IPSTATS_MIB_REASMTIMEOUT),"ReasmReqds" , IPSTATS_MIB_REASMREQDS),"ReasmOKs" , IPSTATS_MIB_REASMOKS),"ReasmFails" , IPSTATS_MIB_REASMFAILS),"FragOKs" , IPSTATS_MIB_FRAGOKS),"FragFails" , IPSTATS_MIB_FRAGFAILS),"FragCreates" , IPSTATS_MIB_FRAGCREATES),"OutTransmits" , IPSTATS_MIB_OUTPKTS),/* Following items are displayed in /proc/net/netstat */ static const struct snmp_mib snmp4_ipextstats_list[] = {"InNoRoutes" , IPSTATS_MIB_INNOROUTES),"InTruncatedPkts" , IPSTATS_MIB_INTRUNCATEDPKTS),"InMcastPkts" , IPSTATS_MIB_INMCASTPKTS),"OutMcastPkts" , IPSTATS_MIB_OUTMCASTPKTS),"InBcastPkts" , IPSTATS_MIB_INBCASTPKTS),"OutBcastPkts" , IPSTATS_MIB_OUTBCASTPKTS),"InOctets" , IPSTATS_MIB_INOCTETS),"OutOctets" , IPSTATS_MIB_OUTOCTETS),"InMcastOctets" , IPSTATS_MIB_INMCASTOCTETS),"OutMcastOctets" , IPSTATS_MIB_OUTMCASTOCTETS),"InBcastOctets" , IPSTATS_MIB_INBCASTOCTETS),"OutBcastOctets" , IPSTATS_MIB_OUTBCASTOCTETS),/* Non RFC4293 fields */ "InCsumErrors" , IPSTATS_MIB_CSUMERRORS),"InNoECTPkts" , IPSTATS_MIB_NOECTPKTS),"InECT1Pkts" , IPSTATS_MIB_ECT1PKTS),"InECT0Pkts" , IPSTATS_MIB_ECT0PKTS),"InCEPkts" , IPSTATS_MIB_CEPKTS),"ReasmOverlaps" , IPSTATS_MIB_REASM_OVERLAPS),static const struct {const char *name;int index;"DestUnreachs" , ICMP_DEST_UNREACH },"TimeExcds" , ICMP_TIME_EXCEEDED },"ParmProbs" , ICMP_PARAMETERPROB },"SrcQuenchs" , ICMP_SOURCE_QUENCH },"Redirects" , ICMP_REDIRECT },"Echos" , ICMP_ECHO },"EchoReps" , ICMP_ECHOREPLY },"Timestamps" , ICMP_TIMESTAMP },"TimestampReps" , ICMP_TIMESTAMPREPLY },"AddrMasks" , ICMP_ADDRESS },"AddrMaskReps" , ICMP_ADDRESSREPLY },static const struct snmp_mib snmp4_tcp_list[] = {"RtoAlgorithm" , TCP_MIB_RTOALGORITHM),"RtoMin" , TCP_MIB_RTOMIN),"RtoMax" , TCP_MIB_RTOMAX),"MaxConn" , TCP_MIB_MAXCONN),"ActiveOpens" , TCP_MIB_ACTIVEOPENS),"PassiveOpens" , TCP_MIB_PASSIVEOPENS),"AttemptFails" , TCP_MIB_ATTEMPTFAILS),"EstabResets" , TCP_MIB_ESTABRESETS),"CurrEstab" , TCP_MIB_CURRESTAB),"InSegs" , TCP_MIB_INSEGS),"OutSegs" , TCP_MIB_OUTSEGS),"RetransSegs" , TCP_MIB_RETRANSSEGS),"InErrs" , TCP_MIB_INERRS),"OutRsts" , TCP_MIB_OUTRSTS),"InCsumErrors" , TCP_MIB_CSUMERRORS),static const struct snmp_mib snmp4_udp_list[] = {"InDatagrams" , UDP_MIB_INDATAGRAMS),"NoPorts" , UDP_MIB_NOPORTS),"InErrors" , UDP_MIB_INERRORS),"OutDatagrams" , UDP_MIB_OUTDATAGRAMS),"RcvbufErrors" , UDP_MIB_RCVBUFERRORS),"SndbufErrors" , UDP_MIB_SNDBUFERRORS),"InCsumErrors" , UDP_MIB_CSUMERRORS),"IgnoredMulti" , UDP_MIB_IGNOREDMULTI),"MemErrors" , UDP_MIB_MEMERRORS),static const struct snmp_mib snmp4_net_list[] = {"SyncookiesSent" , LINUX_MIB_SYNCOOKIESSENT),"SyncookiesRecv" , LINUX_MIB_SYNCOOKIESRECV),"SyncookiesFailed" , LINUX_MIB_SYNCOOKIESFAILED),"EmbryonicRsts" , LINUX_MIB_EMBRYONICRSTS),"PruneCalled" , LINUX_MIB_PRUNECALLED),"RcvPruned" , LINUX_MIB_RCVPRUNED),"OfoPruned" , LINUX_MIB_OFOPRUNED),"OutOfWindowIcmps" , LINUX_MIB_OUTOFWINDOWICMPS),"LockDroppedIcmps" , LINUX_MIB_LOCKDROPPEDICMPS),"ArpFilter" , LINUX_MIB_ARPFILTER),"TW" , LINUX_MIB_TIMEWAITED),"TWRecycled" , LINUX_MIB_TIMEWAITRECYCLED),"TWKilled" , LINUX_MIB_TIMEWAITKILLED),"PAWSActive" , LINUX_MIB_PAWSACTIVEREJECTED),"PAWSEstab" , LINUX_MIB_PAWSESTABREJECTED),"BeyondWindow" , LINUX_MIB_BEYOND_WINDOW),"TSEcrRejected" , LINUX_MIB_TSECRREJECTED),"PAWSOldAck" , LINUX_MIB_PAWS_OLD_ACK),"PAWSTimewait" , LINUX_MIB_PAWS_TW_REJECTED),"DelayedACKs" , LINUX_MIB_DELAYEDACKS),"DelayedACKLocked" , LINUX_MIB_DELAYEDACKLOCKED),"DelayedACKLost" , LINUX_MIB_DELAYEDACKLOST),"ListenOverflows" , LINUX_MIB_LISTENOVERFLOWS),"ListenDrops" , LINUX_MIB_LISTENDROPS),"TCPHPHits" , LINUX_MIB_TCPHPHITS),"TCPPureAcks" , LINUX_MIB_TCPPUREACKS),"TCPHPAcks" , LINUX_MIB_TCPHPACKS),"TCPRenoRecovery" , LINUX_MIB_TCPRENORECOVERY),"TCPSackRecovery" , LINUX_MIB_TCPSACKRECOVERY),"TCPSACKReneging" , LINUX_MIB_TCPSACKRENEGING),"TCPSACKReorder" , LINUX_MIB_TCPSACKREORDER),"TCPRenoReorder" , LINUX_MIB_TCPRENOREORDER),"TCPTSReorder" , LINUX_MIB_TCPTSREORDER),"TCPFullUndo" , LINUX_MIB_TCPFULLUNDO),"TCPPartialUndo" , LINUX_MIB_TCPPARTIALUNDO),"TCPDSACKUndo" , LINUX_MIB_TCPDSACKUNDO),"TCPLossUndo" , LINUX_MIB_TCPLOSSUNDO),"TCPLostRetransmit" , LINUX_MIB_TCPLOSTRETRANSMIT),"TCPRenoFailures" , LINUX_MIB_TCPRENOFAILURES),"TCPSackFailures" , LINUX_MIB_TCPSACKFAILURES),"TCPLossFailures" , LINUX_MIB_TCPLOSSFAILURES),"TCPFastRetrans" , LINUX_MIB_TCPFASTRETRANS),"TCPSlowStartRetrans" , LINUX_MIB_TCPSLOWSTARTRETRANS),"TCPTimeouts" , LINUX_MIB_TCPTIMEOUTS),"TCPLossProbes" , LINUX_MIB_TCPLOSSPROBES),"TCPLossProbeRecovery" , LINUX_MIB_TCPLOSSPROBERECOVERY),"TCPRenoRecoveryFail" , LINUX_MIB_TCPRENORECOVERYFAIL),"TCPSackRecoveryFail" , LINUX_MIB_TCPSACKRECOVERYFAIL),"TCPRcvCollapsed" , LINUX_MIB_TCPRCVCOLLAPSED),"TCPBacklogCoalesce" , LINUX_MIB_TCPBACKLOGCOALESCE),"TCPDSACKOldSent" , LINUX_MIB_TCPDSACKOLDSENT),"TCPDSACKOfoSent" , LINUX_MIB_TCPDSACKOFOSENT),"TCPDSACKRecv" , LINUX_MIB_TCPDSACKRECV),"TCPDSACKOfoRecv" , LINUX_MIB_TCPDSACKOFORECV),"TCPAbortOnData" , LINUX_MIB_TCPABORTONDATA),"TCPAbortOnClose" , LINUX_MIB_TCPABORTONCLOSE),"TCPAbortOnMemory" , LINUX_MIB_TCPABORTONMEMORY),"TCPAbortOnTimeout" , LINUX_MIB_TCPABORTONTIMEOUT),"TCPAbortOnLinger" , LINUX_MIB_TCPABORTONLINGER),"TCPAbortFailed" , LINUX_MIB_TCPABORTFAILED),"TCPMemoryPressures" , LINUX_MIB_TCPMEMORYPRESSURES),"TCPMemoryPressuresChrono" , LINUX_MIB_TCPMEMORYPRESSURESCHRONO),"TCPSACKDiscard" , LINUX_MIB_TCPSACKDISCARD),"TCPDSACKIgnoredOld" , LINUX_MIB_TCPDSACKIGNOREDOLD),"TCPDSACKIgnoredNoUndo" , LINUX_MIB_TCPDSACKIGNOREDNOUNDO),"TCPSpuriousRTOs" , LINUX_MIB_TCPSPURIOUSRTOS),"TCPMD5NotFound" , LINUX_MIB_TCPMD5NOTFOUND),"TCPMD5Unexpected" , LINUX_MIB_TCPMD5UNEXPECTED),"TCPMD5Failure" , LINUX_MIB_TCPMD5FAILURE),"TCPSackShifted" , LINUX_MIB_SACKSHIFTED),"TCPSackMerged" , LINUX_MIB_SACKMERGED),"TCPSackShiftFallback" , LINUX_MIB_SACKSHIFTFALLBACK),"TCPBacklogDrop" , LINUX_MIB_TCPBACKLOGDROP),"PFMemallocDrop" , LINUX_MIB_PFMEMALLOCDROP),"TCPMinTTLDrop" , LINUX_MIB_TCPMINTTLDROP),"TCPDeferAcceptDrop" , LINUX_MIB_TCPDEFERACCEPTDROP),"IPReversePathFilter" , LINUX_MIB_IPRPFILTER),"TCPTimeWaitOverflow" , LINUX_MIB_TCPTIMEWAITOVERFLOW),"TCPReqQFullDoCookies" , LINUX_MIB_TCPREQQFULLDOCOOKIES),"TCPReqQFullDrop" , LINUX_MIB_TCPREQQFULLDROP),"TCPRetransFail" , LINUX_MIB_TCPRETRANSFAIL),"TCPRcvCoalesce" , LINUX_MIB_TCPRCVCOALESCE),"TCPOFOQueue" , LINUX_MIB_TCPOFOQUEUE),"TCPOFODrop" , LINUX_MIB_TCPOFODROP),"TCPOFOMerge" , LINUX_MIB_TCPOFOMERGE),"TCPChallengeACK" , LINUX_MIB_TCPCHALLENGEACK),"TCPSYNChallenge" , LINUX_MIB_TCPSYNCHALLENGE),"TCPFastOpenActive" , LINUX_MIB_TCPFASTOPENACTIVE),"TCPFastOpenActiveFail" , LINUX_MIB_TCPFASTOPENACTIVEFAIL),"TCPFastOpenPassive" , LINUX_MIB_TCPFASTOPENPASSIVE),"TCPFastOpenPassiveFail" , LINUX_MIB_TCPFASTOPENPASSIVEFAIL),"TCPFastOpenListenOverflow" , LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),"TCPFastOpenCookieReqd" , LINUX_MIB_TCPFASTOPENCOOKIEREQD),"TCPFastOpenBlackhole" , LINUX_MIB_TCPFASTOPENBLACKHOLE),"TCPSpuriousRtxHostQueues" , LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),"BusyPollRxPackets" , LINUX_MIB_BUSYPOLLRXPACKETS),"TCPAutoCorking" , LINUX_MIB_TCPAUTOCORKING),"TCPFromZeroWindowAdv" , LINUX_MIB_TCPFROMZEROWINDOWADV),"TCPToZeroWindowAdv" , LINUX_MIB_TCPTOZEROWINDOWADV),"TCPWantZeroWindowAdv" , LINUX_MIB_TCPWANTZEROWINDOWADV),"TCPSynRetrans" , LINUX_MIB_TCPSYNRETRANS),"TCPOrigDataSent" , LINUX_MIB_TCPORIGDATASENT),"TCPHystartTrainDetect" , LINUX_MIB_TCPHYSTARTTRAINDETECT),"TCPHystartTrainCwnd" , LINUX_MIB_TCPHYSTARTTRAINCWND),"TCPHystartDelayDetect" , LINUX_MIB_TCPHYSTARTDELAYDETECT),"TCPHystartDelayCwnd" , LINUX_MIB_TCPHYSTARTDELAYCWND),"TCPACKSkippedSynRecv" , LINUX_MIB_TCPACKSKIPPEDSYNRECV),"TCPACKSkippedPAWS" , LINUX_MIB_TCPACKSKIPPEDPAWS),"TCPACKSkippedSeq" , LINUX_MIB_TCPACKSKIPPEDSEQ),"TCPACKSkippedFinWait2" , LINUX_MIB_TCPACKSKIPPEDFINWAIT2),"TCPACKSkippedTimeWait" , LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),"TCPACKSkippedChallenge" , LINUX_MIB_TCPACKSKIPPEDCHALLENGE),"TCPWinProbe" , LINUX_MIB_TCPWINPROBE),"TCPKeepAlive" , LINUX_MIB_TCPKEEPALIVE),"TCPMTUPFail" , LINUX_MIB_TCPMTUPFAIL),"TCPMTUPSuccess" , LINUX_MIB_TCPMTUPSUCCESS),"TCPDelivered" , LINUX_MIB_TCPDELIVERED),"TCPDeliveredCE" , LINUX_MIB_TCPDELIVEREDCE),"TCPAckCompressed" , LINUX_MIB_TCPACKCOMPRESSED),"TCPZeroWindowDrop" , LINUX_MIB_TCPZEROWINDOWDROP),"TCPRcvQDrop" , LINUX_MIB_TCPRCVQDROP),"TCPWqueueTooBig" , LINUX_MIB_TCPWQUEUETOOBIG),"TCPFastOpenPassiveAltKey" , LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),"TcpTimeoutRehash" , LINUX_MIB_TCPTIMEOUTREHASH),"TcpDuplicateDataRehash" , LINUX_MIB_TCPDUPLICATEDATAREHASH),"TCPDSACKRecvSegs" , LINUX_MIB_TCPDSACKRECVSEGS),"TCPDSACKIgnoredDubious" , LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),"TCPMigrateReqSuccess" , LINUX_MIB_TCPMIGRATEREQSUCCESS),"TCPMigrateReqFailure" , LINUX_MIB_TCPMIGRATEREQFAILURE),"TCPPLBRehash" , LINUX_MIB_TCPPLBREHASH),"TCPAORequired" , LINUX_MIB_TCPAOREQUIRED),"TCPAOBad" , LINUX_MIB_TCPAOBAD),"TCPAOKeyNotFound" , LINUX_MIB_TCPAOKEYNOTFOUND),"TCPAOGood" , LINUX_MIB_TCPAOGOOD),"TCPAODroppedIcmps" , LINUX_MIB_TCPAODROPPEDICMPS),static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,unsigned short *type, int count)int j;if (count) {"\nIcmpMsg:" );for (j = 0; j < count; ++j)" %sType%u" ,"Out" : "In" ,"\nIcmpMsg:" );for (j = 0; j < count; ++j)" %lu" , vals[j]);static void icmpmsg_put(struct seq_file *seq)#define PERLINE 16int i, count;unsigned short type[PERLINE];unsigned long vals[PERLINE], val;struct net *net = seq->private ;for (i = 0; i < ICMPMSG_MIB_MAX; i++) {if (val) {if (count == PERLINE) {#undef PERLINEstatic void icmp_put(struct seq_file *seq)int i;struct net *net = seq->private ;"\nIcmp: InMsgs InErrors InCsumErrors" );for (i = 0; icmpmibmap[i].name; i++)" In%s" , icmpmibmap[i].name);" OutMsgs OutErrors OutRateLimitGlobal OutRateLimitHost" );for (i = 0; icmpmibmap[i].name; i++)" Out%s" , icmpmibmap[i].name);"\nIcmp: %lu %lu %lu" ,for (i = 0; icmpmibmap[i].name; i++)" %lu" ," %lu %lu %lu %lu" ,for (i = 0; icmpmibmap[i].name; i++)" %lu" ,/* * Called from the PROCfs module. This outputs /proc/net/snmp. static int snmp_seq_show_ipstats(struct seq_file *seq, void *v)struct net *net = seq->private ;int i;sizeof (u64));"Ip: Forwarding DefaultTTL" );for (i = 0; snmp4_ipstats_list[i].name; i++)" %s" , snmp4_ipstats_list[i].name);"\nIp: %d %d" ,struct ipstats_mib, mibs) != 0);struct ipstats_mib, syncp));for (i = 0; snmp4_ipstats_list[i].name; i++)" %llu" , buff64[i]);return 0;static int snmp_seq_show_tcp_udp(struct seq_file *seq, void *v)unsigned long buff[TCPUDP_MIB_MAX];struct net *net = seq->private ;int i;sizeof (unsigned long ));"\nTcp:" );for (i = 0; snmp4_tcp_list[i].name; i++)" %s" , snmp4_tcp_list[i].name);"\nTcp:" );for (i = 0; snmp4_tcp_list[i].name; i++) {/* MaxConn field is signed, RFC 2012 */ if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)" %ld" , buff[i]);else " %lu" , buff[i]);sizeof (unsigned long ));"\nUdp:" );for (i = 0; snmp4_udp_list[i].name; i++)" %s" , snmp4_udp_list[i].name);"\nUdp:" );for (i = 0; snmp4_udp_list[i].name; i++)" %lu" , buff[i]);sizeof (unsigned long ));/* the UDP and UDP-Lite MIBs are the same */ "\nUdpLite:" );for (i = 0; snmp4_udp_list[i].name; i++)" %s" , snmp4_udp_list[i].name);"\nUdpLite:" );for (i = 0; snmp4_udp_list[i].name; i++)" %lu" , buff[i]);'\n' );return 0;static int snmp_seq_show(struct seq_file *seq, void *v)/* RFC 2011 compatibility */ return 0;/* * Output /proc/net/netstat static int netstat_seq_show(struct seq_file *seq, void *v)const int ip_cnt = ARRAY_SIZE(snmp4_ipextstats_list) - 1;const int tcp_cnt = ARRAY_SIZE(snmp4_net_list) - 1;struct net *net = seq->private ;unsigned long *buff;int i;"TcpExt:" );for (i = 0; i < tcp_cnt; i++)" %s" , snmp4_net_list[i].name);"\nTcpExt:" );sizeof (long ), ip_cnt * sizeof (u64)),if (buff) {for (i = 0; i < tcp_cnt; i++)" %lu" , buff[i]);else {for (i = 0; i < tcp_cnt; i++)" %lu" ,"\nIpExt:" );for (i = 0; i < ip_cnt; i++)" %s" , snmp4_ipextstats_list[i].name);"\nIpExt:" );if (buff) {sizeof (u64));struct ipstats_mib, syncp));for (i = 0; i < ip_cnt; i++)" %llu" , buff64[i]);else {for (i = 0; i < ip_cnt; i++)" %llu" ,struct ipstats_mib, syncp)));'\n' );return 0;static __net_init int ip_proc_init_net(struct net *net)if (!proc_create_net_single("sockstat" , 0444, net->proc_net,goto out_sockstat;if (!proc_create_net_single("netstat" , 0444, net->proc_net,goto out_netstat;if (!proc_create_net_single("snmp" , 0444, net->proc_net, snmp_seq_show,goto out_snmp;return 0;"netstat" , net->proc_net);"sockstat" , net->proc_net);return -ENOMEM;static __net_exit void ip_proc_exit_net(struct net *net)"snmp" , net->proc_net);"netstat" , net->proc_net);"sockstat" , net->proc_net);static __net_initdata struct pernet_operations ip_proc_ops = {exit = ip_proc_exit_net,int __init ip_misc_proc_init(void )return register_pernet_subsys(&ip_proc_ops);
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