net/ipv4/proc.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * INET     An implementation of the TCP/IP protocol suite for the LINUX
0004  *      operating system.  INET is implemented using the  BSD Socket
0005  *      interface as the means of communication with the user level.
0006  *
0007  *      This file implements the various access functions for the
0008  *      PROC file system.  It is mainly used for debugging and
0009  *      statistics.
0010  *
0011  * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
0012  *      Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
0013  *      Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
0014  *      Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
0015  *
0016  * Fixes:
0017  *      Alan Cox    :   UDP sockets show the rxqueue/txqueue
0018  *                  using hint flag for the netinfo.
0019  *  Pauline Middelink   :   identd support
0020  *      Alan Cox    :   Make /proc safer.
0021  *  Erik Schoenfelder   :   /proc/net/snmp
0022  *      Alan Cox    :   Handle dead sockets properly.
0023  *  Gerhard Koerting    :   Show both timers
0024  *      Alan Cox    :   Allow inode to be NULL (kernel socket)
0025  *  Andi Kleen      :   Add support for open_requests and
0026  *                  split functions for more readibility.
0027  *  Andi Kleen      :   Add support for /proc/net/netstat
0028  *  Arnaldo C. Melo     :   Convert to seq_file
0029  */
0030 #include <linux/types.h>
0031 #include <net/net_namespace.h>
0032 #include <net/icmp.h>
0033 #include <net/protocol.h>
0034 #include <net/tcp.h>
0035 #include <net/mptcp.h>
0036 #include <net/udp.h>
0037 #include <net/udplite.h>
0038 #include <linux/bottom_half.h>
0039 #include <linux/inetdevice.h>
0040 #include <linux/proc_fs.h>
0041 #include <linux/seq_file.h>
0042 #include <linux/export.h>
0043 #include <net/sock.h>
0044 #include <net/raw.h>
0045
0046 #define TCPUDP_MIB_MAX max_t(u32, UDP_MIB_MAX, TCP_MIB_MAX)
0047
0048 /*
0049  *  Report socket allocation statistics [mea@utu.fi]
0050  */
0051 static int sockstat_seq_show(struct seq_file *seq, void *v)
0052 {
0053     struct net *net = seq->private;
0054     int orphans, sockets;
0055
0056     orphans = tcp_orphan_count_sum();
0057     sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
0058
0059     socket_seq_show(seq);
0060     seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
0061            sock_prot_inuse_get(net, &tcp_prot), orphans,
0062            refcount_read(&net->ipv4.tcp_death_row->tw_refcount) - 1,
0063            sockets, proto_memory_allocated(&tcp_prot));
0064     seq_printf(seq, "UDP: inuse %d mem %ld\n",
0065            sock_prot_inuse_get(net, &udp_prot),
0066            proto_memory_allocated(&udp_prot));
0067     seq_printf(seq, "UDPLITE: inuse %d\n",
0068            sock_prot_inuse_get(net, &udplite_prot));
0069     seq_printf(seq, "RAW: inuse %d\n",
0070            sock_prot_inuse_get(net, &raw_prot));
0071     seq_printf(seq,  "FRAG: inuse %u memory %lu\n",
0072            atomic_read(&net->ipv4.fqdir->rhashtable.nelems),
0073            frag_mem_limit(net->ipv4.fqdir));
0074     return 0;
0075 }
0076
0077 /* snmp items */
0078 static const struct snmp_mib snmp4_ipstats_list[] = {
0079     SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
0080     SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
0081     SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
0082     SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
0083     SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
0084     SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
0085     SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
0086     SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
0087     SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
0088     SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
0089     SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
0090     SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
0091     SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
0092     SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
0093     SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
0094     SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
0095     SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
0096     SNMP_MIB_SENTINEL
0097 };
0098
0099 /* Following items are displayed in /proc/net/netstat */
0100 static const struct snmp_mib snmp4_ipextstats_list[] = {
0101     SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
0102     SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
0103     SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
0104     SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
0105     SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
0106     SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
0107     SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
0108     SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
0109     SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
0110     SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
0111     SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
0112     SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
0113     /* Non RFC4293 fields */
0114     SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
0115     SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
0116     SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
0117     SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
0118     SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),
0119     SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),
0120     SNMP_MIB_SENTINEL
0121 };
0122
0123 static const struct {
0124     const char *name;
0125     int index;
0126 } icmpmibmap[] = {
0127     { "DestUnreachs", ICMP_DEST_UNREACH },
0128     { "TimeExcds", ICMP_TIME_EXCEEDED },
0129     { "ParmProbs", ICMP_PARAMETERPROB },
0130     { "SrcQuenchs", ICMP_SOURCE_QUENCH },
0131     { "Redirects", ICMP_REDIRECT },
0132     { "Echos", ICMP_ECHO },
0133     { "EchoReps", ICMP_ECHOREPLY },
0134     { "Timestamps", ICMP_TIMESTAMP },
0135     { "TimestampReps", ICMP_TIMESTAMPREPLY },
0136     { "AddrMasks", ICMP_ADDRESS },
0137     { "AddrMaskReps", ICMP_ADDRESSREPLY },
0138     { NULL, 0 }
0139 };
0140
0141
0142 static const struct snmp_mib snmp4_tcp_list[] = {
0143     SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
0144     SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
0145     SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
0146     SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
0147     SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
0148     SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
0149     SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
0150     SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
0151     SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
0152     SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
0153     SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
0154     SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
0155     SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
0156     SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
0157     SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),
0158     SNMP_MIB_SENTINEL
0159 };
0160
0161 static const struct snmp_mib snmp4_udp_list[] = {
0162     SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
0163     SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
0164     SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
0165     SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
0166     SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
0167     SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
0168     SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),
0169     SNMP_MIB_ITEM("IgnoredMulti", UDP_MIB_IGNOREDMULTI),
0170     SNMP_MIB_ITEM("MemErrors", UDP_MIB_MEMERRORS),
0171     SNMP_MIB_SENTINEL
0172 };
0173
0174 static const struct snmp_mib snmp4_net_list[] = {
0175     SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
0176     SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
0177     SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
0178     SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
0179     SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
0180     SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
0181     SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
0182     SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
0183     SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
0184     SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
0185     SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
0186     SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
0187     SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
0188     SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
0189     SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
0190     SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
0191     SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
0192     SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
0193     SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
0194     SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
0195     SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
0196     SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
0197     SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
0198     SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
0199     SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
0200     SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
0201     SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
0202     SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
0203     SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
0204     SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
0205     SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
0206     SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
0207     SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
0208     SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
0209     SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
0210     SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
0211     SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
0212     SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
0213     SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
0214     SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
0215     SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),
0216     SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),
0217     SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
0218     SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
0219     SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
0220     SNMP_MIB_ITEM("TCPBacklogCoalesce", LINUX_MIB_TCPBACKLOGCOALESCE),
0221     SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
0222     SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
0223     SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
0224     SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
0225     SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
0226     SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
0227     SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
0228     SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
0229     SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
0230     SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
0231     SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
0232     SNMP_MIB_ITEM("TCPMemoryPressuresChrono", LINUX_MIB_TCPMEMORYPRESSURESCHRONO),
0233     SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
0234     SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
0235     SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
0236     SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
0237     SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
0238     SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
0239     SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE),
0240     SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
0241     SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
0242     SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
0243     SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
0244     SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),
0245     SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
0246     SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
0247     SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
0248     SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
0249     SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
0250     SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
0251     SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
0252     SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
0253     SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
0254     SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
0255     SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
0256     SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
0257     SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
0258     SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
0259     SNMP_MIB_ITEM("TCPFastOpenActiveFail", LINUX_MIB_TCPFASTOPENACTIVEFAIL),
0260     SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
0261     SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
0262     SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
0263     SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
0264     SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),
0265     SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
0266     SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),
0267     SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),
0268     SNMP_MIB_ITEM("TCPFromZeroWindowAdv", LINUX_MIB_TCPFROMZEROWINDOWADV),
0269     SNMP_MIB_ITEM("TCPToZeroWindowAdv", LINUX_MIB_TCPTOZEROWINDOWADV),
0270     SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV),
0271     SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS),
0272     SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT),
0273     SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT),
0274     SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND),
0275     SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT),
0276     SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND),
0277     SNMP_MIB_ITEM("TCPACKSkippedSynRecv", LINUX_MIB_TCPACKSKIPPEDSYNRECV),
0278     SNMP_MIB_ITEM("TCPACKSkippedPAWS", LINUX_MIB_TCPACKSKIPPEDPAWS),
0279     SNMP_MIB_ITEM("TCPACKSkippedSeq", LINUX_MIB_TCPACKSKIPPEDSEQ),
0280     SNMP_MIB_ITEM("TCPACKSkippedFinWait2", LINUX_MIB_TCPACKSKIPPEDFINWAIT2),
0281     SNMP_MIB_ITEM("TCPACKSkippedTimeWait", LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),
0282     SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
0283     SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
0284     SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
0285     SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
0286     SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
0287     SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
0288     SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),
0289     SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),
0290     SNMP_MIB_ITEM("TCPZeroWindowDrop", LINUX_MIB_TCPZEROWINDOWDROP),
0291     SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),
0292     SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),
0293     SNMP_MIB_ITEM("TCPFastOpenPassiveAltKey", LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),
0294     SNMP_MIB_ITEM("TcpTimeoutRehash", LINUX_MIB_TCPTIMEOUTREHASH),
0295     SNMP_MIB_ITEM("TcpDuplicateDataRehash", LINUX_MIB_TCPDUPLICATEDATAREHASH),
0296     SNMP_MIB_ITEM("TCPDSACKRecvSegs", LINUX_MIB_TCPDSACKRECVSEGS),
0297     SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),
0298     SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS),
0299     SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE),
0300     SNMP_MIB_SENTINEL
0301 };
0302
0303 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
0304                  unsigned short *type, int count)
0305 {
0306     int j;
0307
0308     if (count) {
0309         seq_puts(seq, "\nIcmpMsg:");
0310         for (j = 0; j < count; ++j)
0311             seq_printf(seq, " %sType%u",
0312                 type[j] & 0x100 ? "Out" : "In",
0313                 type[j] & 0xff);
0314         seq_puts(seq, "\nIcmpMsg:");
0315         for (j = 0; j < count; ++j)
0316             seq_printf(seq, " %lu", vals[j]);
0317     }
0318 }
0319
0320 static void icmpmsg_put(struct seq_file *seq)
0321 {
0322 #define PERLINE 16
0323
0324     int i, count;
0325     unsigned short type[PERLINE];
0326     unsigned long vals[PERLINE], val;
0327     struct net *net = seq->private;
0328
0329     count = 0;
0330     for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
0331         val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
0332         if (val) {
0333             type[count] = i;
0334             vals[count++] = val;
0335         }
0336         if (count == PERLINE) {
0337             icmpmsg_put_line(seq, vals, type, count);
0338             count = 0;
0339         }
0340     }
0341     icmpmsg_put_line(seq, vals, type, count);
0342
0343 #undef PERLINE
0344 }
0345
0346 static void icmp_put(struct seq_file *seq)
0347 {
0348     int i;
0349     struct net *net = seq->private;
0350     atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
0351
0352     seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
0353     for (i = 0; icmpmibmap[i].name; i++)
0354         seq_printf(seq, " In%s", icmpmibmap[i].name);
0355     seq_puts(seq, " OutMsgs OutErrors");
0356     for (i = 0; icmpmibmap[i].name; i++)
0357         seq_printf(seq, " Out%s", icmpmibmap[i].name);
0358     seq_printf(seq, "\nIcmp: %lu %lu %lu",
0359         snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INMSGS),
0360         snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INERRORS),
0361         snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));
0362     for (i = 0; icmpmibmap[i].name; i++)
0363         seq_printf(seq, " %lu",
0364                atomic_long_read(ptr + icmpmibmap[i].index));
0365     seq_printf(seq, " %lu %lu",
0366         snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
0367         snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
0368     for (i = 0; icmpmibmap[i].name; i++)
0369         seq_printf(seq, " %lu",
0370                atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
0371 }
0372
0373 /*
0374  *  Called from the PROCfs module. This outputs /proc/net/snmp.
0375  */
0376 static int snmp_seq_show_ipstats(struct seq_file *seq, void *v)
0377 {
0378     struct net *net = seq->private;
0379     u64 buff64[IPSTATS_MIB_MAX];
0380     int i;
0381
0382     memset(buff64, 0, IPSTATS_MIB_MAX * sizeof(u64));
0383
0384     seq_puts(seq, "Ip: Forwarding DefaultTTL");
0385     for (i = 0; snmp4_ipstats_list[i].name; i++)
0386         seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
0387
0388     seq_printf(seq, "\nIp: %d %d",
0389            IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
0390            READ_ONCE(net->ipv4.sysctl_ip_default_ttl));
0391
0392     BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
0393     snmp_get_cpu_field64_batch(buff64, snmp4_ipstats_list,
0394                    net->mib.ip_statistics,
0395                    offsetof(struct ipstats_mib, syncp));
0396     for (i = 0; snmp4_ipstats_list[i].name; i++)
0397         seq_printf(seq, " %llu", buff64[i]);
0398
0399     return 0;
0400 }
0401
0402 static int snmp_seq_show_tcp_udp(struct seq_file *seq, void *v)
0403 {
0404     unsigned long buff[TCPUDP_MIB_MAX];
0405     struct net *net = seq->private;
0406     int i;
0407
0408     memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
0409
0410     seq_puts(seq, "\nTcp:");
0411     for (i = 0; snmp4_tcp_list[i].name; i++)
0412         seq_printf(seq, " %s", snmp4_tcp_list[i].name);
0413
0414     seq_puts(seq, "\nTcp:");
0415     snmp_get_cpu_field_batch(buff, snmp4_tcp_list,
0416                  net->mib.tcp_statistics);
0417     for (i = 0; snmp4_tcp_list[i].name; i++) {
0418         /* MaxConn field is signed, RFC 2012 */
0419         if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
0420             seq_printf(seq, " %ld", buff[i]);
0421         else
0422             seq_printf(seq, " %lu", buff[i]);
0423     }
0424
0425     memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
0426
0427     snmp_get_cpu_field_batch(buff, snmp4_udp_list,
0428                  net->mib.udp_statistics);
0429     seq_puts(seq, "\nUdp:");
0430     for (i = 0; snmp4_udp_list[i].name; i++)
0431         seq_printf(seq, " %s", snmp4_udp_list[i].name);
0432     seq_puts(seq, "\nUdp:");
0433     for (i = 0; snmp4_udp_list[i].name; i++)
0434         seq_printf(seq, " %lu", buff[i]);
0435
0436     memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
0437
0438     /* the UDP and UDP-Lite MIBs are the same */
0439     seq_puts(seq, "\nUdpLite:");
0440     snmp_get_cpu_field_batch(buff, snmp4_udp_list,
0441                  net->mib.udplite_statistics);
0442     for (i = 0; snmp4_udp_list[i].name; i++)
0443         seq_printf(seq, " %s", snmp4_udp_list[i].name);
0444     seq_puts(seq, "\nUdpLite:");
0445     for (i = 0; snmp4_udp_list[i].name; i++)
0446         seq_printf(seq, " %lu", buff[i]);
0447
0448     seq_putc(seq, '\n');
0449     return 0;
0450 }
0451
0452 static int snmp_seq_show(struct seq_file *seq, void *v)
0453 {
0454     snmp_seq_show_ipstats(seq, v);
0455
0456     icmp_put(seq);  /* RFC 2011 compatibility */
0457     icmpmsg_put(seq);
0458
0459     snmp_seq_show_tcp_udp(seq, v);
0460
0461     return 0;
0462 }
0463
0464 /*
0465  *  Output /proc/net/netstat
0466  */
0467 static int netstat_seq_show(struct seq_file *seq, void *v)
0468 {
0469     const int ip_cnt = ARRAY_SIZE(snmp4_ipextstats_list) - 1;
0470     const int tcp_cnt = ARRAY_SIZE(snmp4_net_list) - 1;
0471     struct net *net = seq->private;
0472     unsigned long *buff;
0473     int i;
0474
0475     seq_puts(seq, "TcpExt:");
0476     for (i = 0; i < tcp_cnt; i++)
0477         seq_printf(seq, " %s", snmp4_net_list[i].name);
0478
0479     seq_puts(seq, "\nTcpExt:");
0480     buff = kzalloc(max(tcp_cnt * sizeof(long), ip_cnt * sizeof(u64)),
0481                GFP_KERNEL);
0482     if (buff) {
0483         snmp_get_cpu_field_batch(buff, snmp4_net_list,
0484                      net->mib.net_statistics);
0485         for (i = 0; i < tcp_cnt; i++)
0486             seq_printf(seq, " %lu", buff[i]);
0487     } else {
0488         for (i = 0; i < tcp_cnt; i++)
0489             seq_printf(seq, " %lu",
0490                    snmp_fold_field(net->mib.net_statistics,
0491                            snmp4_net_list[i].entry));
0492     }
0493     seq_puts(seq, "\nIpExt:");
0494     for (i = 0; i < ip_cnt; i++)
0495         seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
0496
0497     seq_puts(seq, "\nIpExt:");
0498     if (buff) {
0499         u64 *buff64 = (u64 *)buff;
0500
0501         memset(buff64, 0, ip_cnt * sizeof(u64));
0502         snmp_get_cpu_field64_batch(buff64, snmp4_ipextstats_list,
0503                        net->mib.ip_statistics,
0504                        offsetof(struct ipstats_mib, syncp));
0505         for (i = 0; i < ip_cnt; i++)
0506             seq_printf(seq, " %llu", buff64[i]);
0507     } else {
0508         for (i = 0; i < ip_cnt; i++)
0509             seq_printf(seq, " %llu",
0510                    snmp_fold_field64(net->mib.ip_statistics,
0511                              snmp4_ipextstats_list[i].entry,
0512                              offsetof(struct ipstats_mib, syncp)));
0513     }
0514     kfree(buff);
0515     seq_putc(seq, '\n');
0516     mptcp_seq_show(seq);
0517     return 0;
0518 }
0519
0520 static __net_init int ip_proc_init_net(struct net *net)
0521 {
0522     if (!proc_create_net_single("sockstat", 0444, net->proc_net,
0523             sockstat_seq_show, NULL))
0524         goto out_sockstat;
0525     if (!proc_create_net_single("netstat", 0444, net->proc_net,
0526             netstat_seq_show, NULL))
0527         goto out_netstat;
0528     if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
0529             NULL))
0530         goto out_snmp;
0531
0532     return 0;
0533
0534 out_snmp:
0535     remove_proc_entry("netstat", net->proc_net);
0536 out_netstat:
0537     remove_proc_entry("sockstat", net->proc_net);
0538 out_sockstat:
0539     return -ENOMEM;
0540 }
0541
0542 static __net_exit void ip_proc_exit_net(struct net *net)
0543 {
0544     remove_proc_entry("snmp", net->proc_net);
0545     remove_proc_entry("netstat", net->proc_net);
0546     remove_proc_entry("sockstat", net->proc_net);
0547 }
0548
0549 static __net_initdata struct pernet_operations ip_proc_ops = {
0550     .init = ip_proc_init_net,
0551     .exit = ip_proc_exit_net,
0552 };
0553
0554 int __init ip_misc_proc_init(void)
0555 {
0556     return register_pernet_subsys(&ip_proc_ops);
0557 }