// 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/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;

  	orphans = percpu_counter_sum_positive(&tcp_orphan_count);

  	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);

  	socket_seq_show(seq);

  	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld
  ",

  		   sock_prot_inuse_get(net, &tcp_prot), orphans,

  		   atomic_read(&net->ipv4.tcp_death_row.tw_count), sockets,

  		   proto_memory_allocated(&tcp_prot));

  	seq_printf(seq, "UDP: inuse %d mem %ld
  ",

  		   sock_prot_inuse_get(net, &udp_prot),

  		   proto_memory_allocated(&udp_prot));

  	seq_printf(seq, "UDPLITE: inuse %d
  ",

  		   sock_prot_inuse_get(net, &udplite_prot));

  	seq_printf(seq, "RAW: inuse %d
  ",

  		   sock_prot_inuse_get(net, &raw_prot));

  	seq_printf(seq,  "FRAG: inuse %u memory %lu
  ",

  		   atomic_read(&net->ipv4.fqdir->rhashtable.nelems),
  		   frag_mem_limit(net->ipv4.fqdir));

  	return 0;
  }

  /* snmp items */

  static const struct snmp_mib snmp4_ipstats_list[] = {

  	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),

  	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
  	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),

  	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),

  	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
  	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
  	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
  	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
  	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
  	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
  	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
  	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
  	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
  	SNMP_MIB_SENTINEL
  };

  /* Following items are displayed in /proc/net/netstat */

  static const struct snmp_mib snmp4_ipextstats_list[] = {
  	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
  	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
  	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
  	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
  	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
  	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),

  	SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
  	SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
  	SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
  	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
  	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
  	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),

  	/* Non RFC4293 fields */

  	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),

  	SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
  	SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
  	SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
  	SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),

  	SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),

  	SNMP_MIB_SENTINEL
  };

  static const struct {
  	const char *name;

  	int index;
  } icmpmibmap[] = {
  	{ "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 },

  	{ NULL, 0 }

  };

  static const struct snmp_mib snmp4_tcp_list[] = {

  	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
  	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
  	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
  	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
  	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
  	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
  	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
  	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
  	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
  	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
  	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
  	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
  	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
  	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),

  	SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),

  	SNMP_MIB_SENTINEL
  };

  static const struct snmp_mib snmp4_udp_list[] = {

  	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
  	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
  	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
  	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),

  	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
  	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),

  	SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),

  	SNMP_MIB_ITEM("IgnoredMulti", UDP_MIB_IGNOREDMULTI),

  	SNMP_MIB_SENTINEL
  };

  static const struct snmp_mib snmp4_net_list[] = {

  	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
  	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
  	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
  	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
  	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
  	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
  	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
  	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
  	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
  	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
  	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
  	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
  	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),

  	SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
  	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
  	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
  	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
  	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
  	SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
  	SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),

  	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),

  	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),

  	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),

  	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
  	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
  	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),

  	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
  	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
  	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
  	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
  	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
  	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
  	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),

  	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
  	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
  	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
  	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
  	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),

  	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
  	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),

  	SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),

  	SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),

  	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
  	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),

  	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),

  	SNMP_MIB_ITEM("TCPBacklogCoalesce", LINUX_MIB_TCPBACKLOGCOALESCE),

  	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
  	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
  	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
  	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),

  	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
  	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
  	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
  	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
  	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
  	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
  	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),

  	SNMP_MIB_ITEM("TCPMemoryPressuresChrono", LINUX_MIB_TCPMEMORYPRESSURESCHRONO),

  	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
  	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
  	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),

  	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),

  	SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
  	SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),

  	SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE),

  	SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
  	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
  	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),

  	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),

  	SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),

  	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),

  	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),

  	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),

  	SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),

  	SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
  	SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),

  	SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),

  	SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),

  	SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
  	SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
  	SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),

  	SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),

  	SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),

  	SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),

  	SNMP_MIB_ITEM("TCPFastOpenActiveFail", LINUX_MIB_TCPFASTOPENACTIVEFAIL),

  	SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
  	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
  	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
  	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),

  	SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),

  	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),

  	SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),

  	SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),

  	SNMP_MIB_ITEM("TCPFromZeroWindowAdv", LINUX_MIB_TCPFROMZEROWINDOWADV),
  	SNMP_MIB_ITEM("TCPToZeroWindowAdv", LINUX_MIB_TCPTOZEROWINDOWADV),
  	SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV),

  	SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS),
  	SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT),

  	SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT),
  	SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND),
  	SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT),
  	SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND),

  	SNMP_MIB_ITEM("TCPACKSkippedSynRecv", LINUX_MIB_TCPACKSKIPPEDSYNRECV),
  	SNMP_MIB_ITEM("TCPACKSkippedPAWS", LINUX_MIB_TCPACKSKIPPEDPAWS),
  	SNMP_MIB_ITEM("TCPACKSkippedSeq", LINUX_MIB_TCPACKSKIPPEDSEQ),
  	SNMP_MIB_ITEM("TCPACKSkippedFinWait2", LINUX_MIB_TCPACKSKIPPEDFINWAIT2),
  	SNMP_MIB_ITEM("TCPACKSkippedTimeWait", LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),
  	SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),

  	SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
  	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),

  	SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
  	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),

  	SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
  	SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),

  	SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),

  	SNMP_MIB_ITEM("TCPZeroWindowDrop", LINUX_MIB_TCPZEROWINDOWDROP),

  	SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),

  	SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),

  	SNMP_MIB_ITEM("TCPFastOpenPassiveAltKey", LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),

  	SNMP_MIB_ITEM("TcpTimeoutRehash", LINUX_MIB_TCPTIMEOUTREHASH),
  	SNMP_MIB_ITEM("TcpDuplicateDataRehash", LINUX_MIB_TCPDUPLICATEDATAREHASH),

  	SNMP_MIB_ITEM("TCPDSACKRecvSegs", LINUX_MIB_TCPDSACKRECVSEGS),

  	SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),

  	SNMP_MIB_SENTINEL
  };

  static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
  			     unsigned short *type, int count)
  {
  	int j;
  
  	if (count) {

  		seq_puts(seq, "
  IcmpMsg:");

  		for (j = 0; j < count; ++j)
  			seq_printf(seq, " %sType%u",
  				type[j] & 0x100 ? "Out" : "In",
  				type[j] & 0xff);

  		seq_puts(seq, "
  IcmpMsg:");

  		for (j = 0; j < count; ++j)
  			seq_printf(seq, " %lu", vals[j]);
  	}
  }

  static void icmpmsg_put(struct seq_file *seq)
  {
  #define PERLINE	16

  	int i, count;
  	unsigned short type[PERLINE];
  	unsigned long vals[PERLINE], val;

  	struct net *net = seq->private;

  
  	count = 0;
  	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {

  		val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);

  		if (val) {
  			type[count] = i;
  			vals[count++] = val;
  		}
  		if (count == PERLINE) {
  			icmpmsg_put_line(seq, vals, type, count);
  			count = 0;
  		}

  	}

  	icmpmsg_put_line(seq, vals, type, count);

  
  #undef PERLINE
  }
  
  static void icmp_put(struct seq_file *seq)
  {
  	int i;

  	struct net *net = seq->private;

  	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;

  	seq_puts(seq, "
  Icmp: InMsgs InErrors InCsumErrors");

  	for (i = 0; icmpmibmap[i].name; i++)

  		seq_printf(seq, " In%s", icmpmibmap[i].name);

  	seq_puts(seq, " OutMsgs OutErrors");

  	for (i = 0; icmpmibmap[i].name; i++)

  		seq_printf(seq, " Out%s", icmpmibmap[i].name);

  	seq_printf(seq, "
  Icmp: %lu %lu %lu",

  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INMSGS),
  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INERRORS),
  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));

  	for (i = 0; icmpmibmap[i].name; i++)

  		seq_printf(seq, " %lu",

  			   atomic_long_read(ptr + icmpmibmap[i].index));

  	seq_printf(seq, " %lu %lu",

  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));

  	for (i = 0; icmpmibmap[i].name; i++)

  		seq_printf(seq, " %lu",

  			   atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));

  }

  /*
   *	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;

  	u64 buff64[IPSTATS_MIB_MAX];
  	int i;

  	memset(buff64, 0, IPSTATS_MIB_MAX * sizeof(u64));

  	seq_puts(seq, "Ip: Forwarding DefaultTTL");

  	for (i = 0; snmp4_ipstats_list[i].name; i++)

  		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
  
  	seq_printf(seq, "
  Ip: %d %d",

  		   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,

  		   net->ipv4.sysctl_ip_default_ttl);

  	BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);

  	snmp_get_cpu_field64_batch(buff64, snmp4_ipstats_list,
  				   net->mib.ip_statistics,
  				   offsetof(struct ipstats_mib, syncp));

  	for (i = 0; snmp4_ipstats_list[i].name; i++)

  		seq_printf(seq, " %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;
  
  	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));

  
  	seq_puts(seq, "
  Tcp:");

  	for (i = 0; snmp4_tcp_list[i].name; i++)

  		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
  
  	seq_puts(seq, "
  Tcp:");

  	snmp_get_cpu_field_batch(buff, snmp4_tcp_list,
  				 net->mib.tcp_statistics);

  	for (i = 0; snmp4_tcp_list[i].name; i++) {

  		/* MaxConn field is signed, RFC 2012 */
  		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)

  			seq_printf(seq, " %ld", buff[i]);

  		else

  			seq_printf(seq, " %lu", buff[i]);

  	}

  	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
  
  	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
  				 net->mib.udp_statistics);

  	seq_puts(seq, "
  Udp:");

  	for (i = 0; snmp4_udp_list[i].name; i++)

  		seq_printf(seq, " %s", snmp4_udp_list[i].name);

  	seq_puts(seq, "
  Udp:");

  	for (i = 0; snmp4_udp_list[i].name; i++)

  		seq_printf(seq, " %lu", buff[i]);
  
  	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));

  	/* the UDP and UDP-Lite MIBs are the same */
  	seq_puts(seq, "
  UdpLite:");

  	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
  				 net->mib.udplite_statistics);

  	for (i = 0; snmp4_udp_list[i].name; i++)

  		seq_printf(seq, " %s", snmp4_udp_list[i].name);

  	seq_puts(seq, "
  UdpLite:");

  	for (i = 0; snmp4_udp_list[i].name; i++)

  		seq_printf(seq, " %lu", buff[i]);

  	seq_putc(seq, '
  ');
  	return 0;
  }

  static int snmp_seq_show(struct seq_file *seq, void *v)
  {
  	snmp_seq_show_ipstats(seq, v);
  
  	icmp_put(seq);	/* RFC 2011 compatibility */
  	icmpmsg_put(seq);
  
  	snmp_seq_show_tcp_udp(seq, v);
  
  	return 0;
  }

  /*
   *	Output /proc/net/netstat
   */
  static int netstat_seq_show(struct seq_file *seq, void *v)
  {
  	int i;

  	struct net *net = seq->private;

  
  	seq_puts(seq, "TcpExt:");

  	for (i = 0; snmp4_net_list[i].name; i++)

  		seq_printf(seq, " %s", snmp4_net_list[i].name);
  
  	seq_puts(seq, "
  TcpExt:");

  	for (i = 0; snmp4_net_list[i].name; i++)

  		seq_printf(seq, " %lu",

  			   snmp_fold_field(net->mib.net_statistics,

  					   snmp4_net_list[i].entry));

  	seq_puts(seq, "
  IpExt:");

  	for (i = 0; snmp4_ipextstats_list[i].name; i++)

  		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
  
  	seq_puts(seq, "
  IpExt:");

  	for (i = 0; snmp4_ipextstats_list[i].name; i++)

  		seq_printf(seq, " %llu",

  			   snmp_fold_field64(net->mib.ip_statistics,

  					     snmp4_ipextstats_list[i].entry,
  					     offsetof(struct ipstats_mib, syncp)));

  	seq_putc(seq, '
  ');

  	mptcp_seq_show(seq);

  	return 0;
  }

  static __net_init int ip_proc_init_net(struct net *net)
  {

  	if (!proc_create_net_single("sockstat", 0444, net->proc_net,
  			sockstat_seq_show, NULL))

  		goto out_sockstat;

  	if (!proc_create_net_single("netstat", 0444, net->proc_net,
  			netstat_seq_show, NULL))

  		goto out_netstat;

  	if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
  			NULL))

  		goto out_snmp;

  	return 0;

  out_snmp:

  	remove_proc_entry("netstat", net->proc_net);

  out_netstat:

  	remove_proc_entry("sockstat", net->proc_net);

  out_sockstat:

  	return -ENOMEM;

  }
  
  static __net_exit void ip_proc_exit_net(struct net *net)
  {

  	remove_proc_entry("snmp", net->proc_net);
  	remove_proc_entry("netstat", net->proc_net);
  	remove_proc_entry("sockstat", net->proc_net);

  }
  
  static __net_initdata struct pernet_operations ip_proc_ops = {
  	.init = ip_proc_init_net,
  	.exit = ip_proc_exit_net,
  };

  int __init ip_misc_proc_init(void)
  {

  	return register_pernet_subsys(&ip_proc_ops);

  }