linux/net/ipv4/proc.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4 *              operating system.  INET is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              This file implements the various access functions for the
   8 *              PROC file system.  It is mainly used for debugging and
   9 *              statistics.
  10 *
  11 * Authors:     Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 *              Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
  13 *              Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
  14 *              Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
  15 *
  16 * Fixes:
  17 *              Alan Cox        :       UDP sockets show the rxqueue/txqueue
  18 *                                      using hint flag for the netinfo.
  19 *      Pauline Middelink       :       identd support
  20 *              Alan Cox        :       Make /proc safer.
  21 *      Erik Schoenfelder       :       /proc/net/snmp
  22 *              Alan Cox        :       Handle dead sockets properly.
  23 *      Gerhard Koerting        :       Show both timers
  24 *              Alan Cox        :       Allow inode to be NULL (kernel socket)
  25 *      Andi Kleen              :       Add support for open_requests and
  26 *                                      split functions for more readibility.
  27 *      Andi Kleen              :       Add support for /proc/net/netstat
  28 *      Arnaldo C. Melo         :       Convert to seq_file
  29 */
  30#include <linux/types.h>
  31#include <net/net_namespace.h>
  32#include <net/icmp.h>
  33#include <net/protocol.h>
  34#include <net/tcp.h>
  35#include <net/mptcp.h>
  36#include <net/udp.h>
  37#include <net/udplite.h>
  38#include <linux/bottom_half.h>
  39#include <linux/inetdevice.h>
  40#include <linux/proc_fs.h>
  41#include <linux/seq_file.h>
  42#include <linux/export.h>
  43#include <net/sock.h>
  44#include <net/raw.h>
  45
  46#define TCPUDP_MIB_MAX max_t(u32, UDP_MIB_MAX, TCP_MIB_MAX)
  47
  48/*
  49 *      Report socket allocation statistics [mea@utu.fi]
  50 */
  51static int sockstat_seq_show(struct seq_file *seq, void *v)
  52{
  53        struct net *net = seq->private;
  54        int orphans, sockets;
  55
  56        orphans = percpu_counter_sum_positive(&tcp_orphan_count);
  57        sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
  58
  59        socket_seq_show(seq);
  60        seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
  61                   sock_prot_inuse_get(net, &tcp_prot), orphans,
  62                   atomic_read(&net->ipv4.tcp_death_row.tw_count), sockets,
  63                   proto_memory_allocated(&tcp_prot));
  64        seq_printf(seq, "UDP: inuse %d mem %ld\n",
  65                   sock_prot_inuse_get(net, &udp_prot),
  66                   proto_memory_allocated(&udp_prot));
  67        seq_printf(seq, "UDPLITE: inuse %d\n",
  68                   sock_prot_inuse_get(net, &udplite_prot));
  69        seq_printf(seq, "RAW: inuse %d\n",
  70                   sock_prot_inuse_get(net, &raw_prot));
  71        seq_printf(seq,  "FRAG: inuse %u memory %lu\n",
  72                   atomic_read(&net->ipv4.fqdir->rhashtable.nelems),
  73                   frag_mem_limit(net->ipv4.fqdir));
  74        return 0;
  75}
  76
  77/* snmp items */
  78static const struct snmp_mib snmp4_ipstats_list[] = {
  79        SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
  80        SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  81        SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  82        SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  83        SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  84        SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
  85        SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
  86        SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
  87        SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
  88        SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
  89        SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
  90        SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
  91        SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
  92        SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
  93        SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
  94        SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
  95        SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
  96        SNMP_MIB_SENTINEL
  97};
  98
  99/* Following items are displayed in /proc/net/netstat */
 100static const struct snmp_mib snmp4_ipextstats_list[] = {
 101        SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 102        SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 103        SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 104        SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 105        SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 106        SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 107        SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
 108        SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
 109        SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
 110        SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
 111        SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
 112        SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
 113        /* Non RFC4293 fields */
 114        SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
 115        SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
 116        SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
 117        SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
 118        SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),
 119        SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),
 120        SNMP_MIB_SENTINEL
 121};
 122
 123static const struct {
 124        const char *name;
 125        int index;
 126} icmpmibmap[] = {
 127        { "DestUnreachs", ICMP_DEST_UNREACH },
 128        { "TimeExcds", ICMP_TIME_EXCEEDED },
 129        { "ParmProbs", ICMP_PARAMETERPROB },
 130        { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 131        { "Redirects", ICMP_REDIRECT },
 132        { "Echos", ICMP_ECHO },
 133        { "EchoReps", ICMP_ECHOREPLY },
 134        { "Timestamps", ICMP_TIMESTAMP },
 135        { "TimestampReps", ICMP_TIMESTAMPREPLY },
 136        { "AddrMasks", ICMP_ADDRESS },
 137        { "AddrMaskReps", ICMP_ADDRESSREPLY },
 138        { NULL, 0 }
 139};
 140
 141
 142static const struct snmp_mib snmp4_tcp_list[] = {
 143        SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 144        SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 145        SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 146        SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 147        SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 148        SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 149        SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 150        SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 151        SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 152        SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 153        SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 154        SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 155        SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 156        SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 157        SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),
 158        SNMP_MIB_SENTINEL
 159};
 160
 161static const struct snmp_mib snmp4_udp_list[] = {
 162        SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 163        SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 164        SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 165        SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 166        SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 167        SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 168        SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),
 169        SNMP_MIB_ITEM("IgnoredMulti", UDP_MIB_IGNOREDMULTI),
 170        SNMP_MIB_ITEM("MemErrors", UDP_MIB_MEMERRORS),
 171        SNMP_MIB_SENTINEL
 172};
 173
 174static const struct snmp_mib snmp4_net_list[] = {
 175        SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 176        SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 177        SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 178        SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 179        SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 180        SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 181        SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 182        SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 183        SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 184        SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 185        SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 186        SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 187        SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 188        SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 189        SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 190        SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 191        SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 192        SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 193        SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 194        SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 195        SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 196        SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 197        SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 198        SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 199        SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 200        SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 201        SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 202        SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 203        SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 204        SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 205        SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 206        SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 207        SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 208        SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 209        SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 210        SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 211        SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 212        SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 213        SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 214        SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 215        SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),
 216        SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),
 217        SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 218        SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 219        SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 220        SNMP_MIB_ITEM("TCPBacklogCoalesce", LINUX_MIB_TCPBACKLOGCOALESCE),
 221        SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 222        SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 223        SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 224        SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 225        SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 226        SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 227        SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 228        SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 229        SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 230        SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 231        SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 232        SNMP_MIB_ITEM("TCPMemoryPressuresChrono", LINUX_MIB_TCPMEMORYPRESSURESCHRONO),
 233        SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 234        SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 235        SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 236        SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 237        SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
 238        SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
 239        SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE),
 240        SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
 241        SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
 242        SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
 243        SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
 244        SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),
 245        SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
 246        SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
 247        SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
 248        SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
 249        SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
 250        SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
 251        SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
 252        SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
 253        SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
 254        SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
 255        SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
 256        SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
 257        SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
 258        SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
 259        SNMP_MIB_ITEM("TCPFastOpenActiveFail", LINUX_MIB_TCPFASTOPENACTIVEFAIL),
 260        SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
 261        SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
 262        SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
 263        SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
 264        SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),
 265        SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
 266        SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),
 267        SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),
 268        SNMP_MIB_ITEM("TCPFromZeroWindowAdv", LINUX_MIB_TCPFROMZEROWINDOWADV),
 269        SNMP_MIB_ITEM("TCPToZeroWindowAdv", LINUX_MIB_TCPTOZEROWINDOWADV),
 270        SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV),
 271        SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS),
 272        SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT),
 273        SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT),
 274        SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND),
 275        SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT),
 276        SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND),
 277        SNMP_MIB_ITEM("TCPACKSkippedSynRecv", LINUX_MIB_TCPACKSKIPPEDSYNRECV),
 278        SNMP_MIB_ITEM("TCPACKSkippedPAWS", LINUX_MIB_TCPACKSKIPPEDPAWS),
 279        SNMP_MIB_ITEM("TCPACKSkippedSeq", LINUX_MIB_TCPACKSKIPPEDSEQ),
 280        SNMP_MIB_ITEM("TCPACKSkippedFinWait2", LINUX_MIB_TCPACKSKIPPEDFINWAIT2),
 281        SNMP_MIB_ITEM("TCPACKSkippedTimeWait", LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),
 282        SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
 283        SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
 284        SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
 285        SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
 286        SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
 287        SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
 288        SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),
 289        SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),
 290        SNMP_MIB_ITEM("TCPZeroWindowDrop", LINUX_MIB_TCPZEROWINDOWDROP),
 291        SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),
 292        SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),
 293        SNMP_MIB_ITEM("TCPFastOpenPassiveAltKey", LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),
 294        SNMP_MIB_ITEM("TcpTimeoutRehash", LINUX_MIB_TCPTIMEOUTREHASH),
 295        SNMP_MIB_ITEM("TcpDuplicateDataRehash", LINUX_MIB_TCPDUPLICATEDATAREHASH),
 296        SNMP_MIB_ITEM("TCPDSACKRecvSegs", LINUX_MIB_TCPDSACKRECVSEGS),
 297        SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),
 298        SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS),
 299        SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE),
 300        SNMP_MIB_SENTINEL
 301};
 302
 303static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
 304                             unsigned short *type, int count)
 305{
 306        int j;
 307
 308        if (count) {
 309                seq_puts(seq, "\nIcmpMsg:");
 310                for (j = 0; j < count; ++j)
 311                        seq_printf(seq, " %sType%u",
 312                                type[j] & 0x100 ? "Out" : "In",
 313                                type[j] & 0xff);
 314                seq_puts(seq, "\nIcmpMsg:");
 315                for (j = 0; j < count; ++j)
 316                        seq_printf(seq, " %lu", vals[j]);
 317        }
 318}
 319
 320static void icmpmsg_put(struct seq_file *seq)
 321{
 322#define PERLINE 16
 323
 324        int i, count;
 325        unsigned short type[PERLINE];
 326        unsigned long vals[PERLINE], val;
 327        struct net *net = seq->private;
 328
 329        count = 0;
 330        for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 331                val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
 332                if (val) {
 333                        type[count] = i;
 334                        vals[count++] = val;
 335                }
 336                if (count == PERLINE) {
 337                        icmpmsg_put_line(seq, vals, type, count);
 338                        count = 0;
 339                }
 340        }
 341        icmpmsg_put_line(seq, vals, type, count);
 342
 343#undef PERLINE
 344}
 345
 346static void icmp_put(struct seq_file *seq)
 347{
 348        int i;
 349        struct net *net = seq->private;
 350        atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
 351
 352        seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
 353        for (i = 0; icmpmibmap[i].name; i++)
 354                seq_printf(seq, " In%s", icmpmibmap[i].name);
 355        seq_puts(seq, " OutMsgs OutErrors");
 356        for (i = 0; icmpmibmap[i].name; i++)
 357                seq_printf(seq, " Out%s", icmpmibmap[i].name);
 358        seq_printf(seq, "\nIcmp: %lu %lu %lu",
 359                snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INMSGS),
 360                snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INERRORS),
 361                snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));
 362        for (i = 0; icmpmibmap[i].name; i++)
 363                seq_printf(seq, " %lu",
 364                           atomic_long_read(ptr + icmpmibmap[i].index));
 365        seq_printf(seq, " %lu %lu",
 366                snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
 367                snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
 368        for (i = 0; icmpmibmap[i].name; i++)
 369                seq_printf(seq, " %lu",
 370                           atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
 371}
 372
 373/*
 374 *      Called from the PROCfs module. This outputs /proc/net/snmp.
 375 */
 376static int snmp_seq_show_ipstats(struct seq_file *seq, void *v)
 377{
 378        struct net *net = seq->private;
 379        u64 buff64[IPSTATS_MIB_MAX];
 380        int i;
 381
 382        memset(buff64, 0, IPSTATS_MIB_MAX * sizeof(u64));
 383
 384        seq_puts(seq, "Ip: Forwarding DefaultTTL");
 385        for (i = 0; snmp4_ipstats_list[i].name; i++)
 386                seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 387
 388        seq_printf(seq, "\nIp: %d %d",
 389                   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
 390                   net->ipv4.sysctl_ip_default_ttl);
 391
 392        BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
 393        snmp_get_cpu_field64_batch(buff64, snmp4_ipstats_list,
 394                                   net->mib.ip_statistics,
 395                                   offsetof(struct ipstats_mib, syncp));
 396        for (i = 0; snmp4_ipstats_list[i].name; i++)
 397                seq_printf(seq, " %llu", buff64[i]);
 398
 399        return 0;
 400}
 401
 402static int snmp_seq_show_tcp_udp(struct seq_file *seq, void *v)
 403{
 404        unsigned long buff[TCPUDP_MIB_MAX];
 405        struct net *net = seq->private;
 406        int i;
 407
 408        memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
 409
 410        seq_puts(seq, "\nTcp:");
 411        for (i = 0; snmp4_tcp_list[i].name; i++)
 412                seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 413
 414        seq_puts(seq, "\nTcp:");
 415        snmp_get_cpu_field_batch(buff, snmp4_tcp_list,
 416                                 net->mib.tcp_statistics);
 417        for (i = 0; snmp4_tcp_list[i].name; i++) {
 418                /* MaxConn field is signed, RFC 2012 */
 419                if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 420                        seq_printf(seq, " %ld", buff[i]);
 421                else
 422                        seq_printf(seq, " %lu", buff[i]);
 423        }
 424
 425        memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
 426
 427        snmp_get_cpu_field_batch(buff, snmp4_udp_list,
 428                                 net->mib.udp_statistics);
 429        seq_puts(seq, "\nUdp:");
 430        for (i = 0; snmp4_udp_list[i].name; i++)
 431                seq_printf(seq, " %s", snmp4_udp_list[i].name);
 432        seq_puts(seq, "\nUdp:");
 433        for (i = 0; snmp4_udp_list[i].name; i++)
 434                seq_printf(seq, " %lu", buff[i]);
 435
 436        memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
 437
 438        /* the UDP and UDP-Lite MIBs are the same */
 439        seq_puts(seq, "\nUdpLite:");
 440        snmp_get_cpu_field_batch(buff, snmp4_udp_list,
 441                                 net->mib.udplite_statistics);
 442        for (i = 0; snmp4_udp_list[i].name; i++)
 443                seq_printf(seq, " %s", snmp4_udp_list[i].name);
 444        seq_puts(seq, "\nUdpLite:");
 445        for (i = 0; snmp4_udp_list[i].name; i++)
 446                seq_printf(seq, " %lu", buff[i]);
 447
 448        seq_putc(seq, '\n');
 449        return 0;
 450}
 451
 452static int snmp_seq_show(struct seq_file *seq, void *v)
 453{
 454        snmp_seq_show_ipstats(seq, v);
 455
 456        icmp_put(seq);  /* RFC 2011 compatibility */
 457        icmpmsg_put(seq);
 458
 459        snmp_seq_show_tcp_udp(seq, v);
 460
 461        return 0;
 462}
 463
 464/*
 465 *      Output /proc/net/netstat
 466 */
 467static int netstat_seq_show(struct seq_file *seq, void *v)
 468{
 469        const int ip_cnt = ARRAY_SIZE(snmp4_ipextstats_list) - 1;
 470        const int tcp_cnt = ARRAY_SIZE(snmp4_net_list) - 1;
 471        struct net *net = seq->private;
 472        unsigned long *buff;
 473        int i;
 474
 475        seq_puts(seq, "TcpExt:");
 476        for (i = 0; i < tcp_cnt; i++)
 477                seq_printf(seq, " %s", snmp4_net_list[i].name);
 478
 479        seq_puts(seq, "\nTcpExt:");
 480        buff = kzalloc(max(tcp_cnt * sizeof(long), ip_cnt * sizeof(u64)),
 481                       GFP_KERNEL);
 482        if (buff) {
 483                snmp_get_cpu_field_batch(buff, snmp4_net_list,
 484                                         net->mib.net_statistics);
 485                for (i = 0; i < tcp_cnt; i++)
 486                        seq_printf(seq, " %lu", buff[i]);
 487        } else {
 488                for (i = 0; i < tcp_cnt; i++)
 489                        seq_printf(seq, " %lu",
 490                                   snmp_fold_field(net->mib.net_statistics,
 491                                                   snmp4_net_list[i].entry));
 492        }
 493        seq_puts(seq, "\nIpExt:");
 494        for (i = 0; i < ip_cnt; i++)
 495                seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 496
 497        seq_puts(seq, "\nIpExt:");
 498        if (buff) {
 499                u64 *buff64 = (u64 *)buff;
 500
 501                memset(buff64, 0, ip_cnt * sizeof(u64));
 502                snmp_get_cpu_field64_batch(buff64, snmp4_ipextstats_list,
 503                                           net->mib.ip_statistics,
 504                                           offsetof(struct ipstats_mib, syncp));
 505                for (i = 0; i < ip_cnt; i++)
 506                        seq_printf(seq, " %llu", buff64[i]);
 507        } else {
 508                for (i = 0; i < ip_cnt; i++)
 509                        seq_printf(seq, " %llu",
 510                                   snmp_fold_field64(net->mib.ip_statistics,
 511                                                     snmp4_ipextstats_list[i].entry,
 512                                                     offsetof(struct ipstats_mib, syncp)));
 513        }
 514        kfree(buff);
 515        seq_putc(seq, '\n');
 516        mptcp_seq_show(seq);
 517        return 0;
 518}
 519
 520static __net_init int ip_proc_init_net(struct net *net)
 521{
 522        if (!proc_create_net_single("sockstat", 0444, net->proc_net,
 523                        sockstat_seq_show, NULL))
 524                goto out_sockstat;
 525        if (!proc_create_net_single("netstat", 0444, net->proc_net,
 526                        netstat_seq_show, NULL))
 527                goto out_netstat;
 528        if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
 529                        NULL))
 530                goto out_snmp;
 531
 532        return 0;
 533
 534out_snmp:
 535        remove_proc_entry("netstat", net->proc_net);
 536out_netstat:
 537        remove_proc_entry("sockstat", net->proc_net);
 538out_sockstat:
 539        return -ENOMEM;
 540}
 541
 542static __net_exit void ip_proc_exit_net(struct net *net)
 543{
 544        remove_proc_entry("snmp", net->proc_net);
 545        remove_proc_entry("netstat", net->proc_net);
 546        remove_proc_entry("sockstat", net->proc_net);
 547}
 548
 549static __net_initdata struct pernet_operations ip_proc_ops = {
 550        .init = ip_proc_init_net,
 551        .exit = ip_proc_exit_net,
 552};
 553
 554int __init ip_misc_proc_init(void)
 555{
 556        return register_pernet_subsys(&ip_proc_ops);
 557}
 558