net/ipv4/proc.c

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