linux/net/ipv4/proc.c
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   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 <net/sock.h>
  46#include <net/raw.h>
  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        local_bh_disable();
  57        orphans = percpu_counter_sum_positive(&tcp_orphan_count);
  58        sockets = percpu_counter_sum_positive(&tcp_sockets_allocated);
  59        local_bh_enable();
  60
  61        socket_seq_show(seq);
  62        seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
  63                   sock_prot_inuse_get(net, &tcp_prot), orphans,
  64                   tcp_death_row.tw_count, sockets,
  65                   atomic_read(&tcp_memory_allocated));
  66        seq_printf(seq, "UDP: inuse %d mem %d\n",
  67                   sock_prot_inuse_get(net, &udp_prot),
  68                   atomic_read(&udp_memory_allocated));
  69        seq_printf(seq, "UDPLITE: inuse %d\n",
  70                   sock_prot_inuse_get(net, &udplite_prot));
  71        seq_printf(seq, "RAW: inuse %d\n",
  72                   sock_prot_inuse_get(net, &raw_prot));
  73        seq_printf(seq,  "FRAG: inuse %d memory %d\n",
  74                        ip_frag_nqueues(net), ip_frag_mem(net));
  75        return 0;
  76}
  77
  78static int sockstat_seq_open(struct inode *inode, struct file *file)
  79{
  80        return single_open_net(inode, file, sockstat_seq_show);
  81}
  82
  83static const struct file_operations sockstat_seq_fops = {
  84        .owner   = THIS_MODULE,
  85        .open    = sockstat_seq_open,
  86        .read    = seq_read,
  87        .llseek  = seq_lseek,
  88        .release = single_release_net,
  89};
  90
  91/* snmp items */
  92static const struct snmp_mib snmp4_ipstats_list[] = {
  93        SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
  94        SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  95        SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  96        SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  97        SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  98        SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
  99        SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
 100        SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
 101        SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 102        SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 103        SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 104        SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
 105        SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
 106        SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
 107        SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
 108        SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 109        SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 110        SNMP_MIB_SENTINEL
 111};
 112
 113/* Following RFC4293 items are displayed in /proc/net/netstat */
 114static const struct snmp_mib snmp4_ipextstats_list[] = {
 115        SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 116        SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 117        SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 118        SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 119        SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 120        SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 121        SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
 122        SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
 123        SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
 124        SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
 125        SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
 126        SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
 127        SNMP_MIB_SENTINEL
 128};
 129
 130static const struct {
 131        const char *name;
 132        int index;
 133} icmpmibmap[] = {
 134        { "DestUnreachs", ICMP_DEST_UNREACH },
 135        { "TimeExcds", ICMP_TIME_EXCEEDED },
 136        { "ParmProbs", ICMP_PARAMETERPROB },
 137        { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 138        { "Redirects", ICMP_REDIRECT },
 139        { "Echos", ICMP_ECHO },
 140        { "EchoReps", ICMP_ECHOREPLY },
 141        { "Timestamps", ICMP_TIMESTAMP },
 142        { "TimestampReps", ICMP_TIMESTAMPREPLY },
 143        { "AddrMasks", ICMP_ADDRESS },
 144        { "AddrMaskReps", ICMP_ADDRESSREPLY },
 145        { NULL, 0 }
 146};
 147
 148
 149static const struct snmp_mib snmp4_tcp_list[] = {
 150        SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 151        SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 152        SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 153        SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 154        SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 155        SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 156        SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 157        SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 158        SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 159        SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 160        SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 161        SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 162        SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 163        SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 164        SNMP_MIB_SENTINEL
 165};
 166
 167static const struct snmp_mib snmp4_udp_list[] = {
 168        SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 169        SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 170        SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 171        SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 172        SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 173        SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 174        SNMP_MIB_SENTINEL
 175};
 176
 177static const struct snmp_mib snmp4_net_list[] = {
 178        SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 179        SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 180        SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 181        SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 182        SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 183        SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 184        SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 185        SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 186        SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 187        SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 188        SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 189        SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 190        SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 191        SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 192        SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 193        SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 194        SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 195        SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 196        SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 197        SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 198        SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 199        SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 200        SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 201        SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 202        SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 203        SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 204        SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 205        SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 206        SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 207        SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 208        SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 209        SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 210        SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 211        SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 212        SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 213        SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 214        SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 215        SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 216        SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 217        SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 218        SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 219        SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 220        SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 221        SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 222        SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 223        SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 224        SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 225        SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 226        SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 227        SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 228        SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 229        SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 230        SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 231        SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 232        SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 233        SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 234        SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 235        SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 236        SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 237        SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 238        SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 239        SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 240        SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 241        SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 242        SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 243        SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 244        SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 245        SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 246        SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 247        SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
 248        SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
 249        SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
 250        SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
 251        SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
 252        SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
 253        SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
 254        SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
 255        SNMP_MIB_SENTINEL
 256};
 257
 258static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
 259                             unsigned short *type, int count)
 260{
 261        int j;
 262
 263        if (count) {
 264                seq_printf(seq, "\nIcmpMsg:");
 265                for (j = 0; j < count; ++j)
 266                        seq_printf(seq, " %sType%u",
 267                                type[j] & 0x100 ? "Out" : "In",
 268                                type[j] & 0xff);
 269                seq_printf(seq, "\nIcmpMsg:");
 270                for (j = 0; j < count; ++j)
 271                        seq_printf(seq, " %lu", vals[j]);
 272        }
 273}
 274
 275static void icmpmsg_put(struct seq_file *seq)
 276{
 277#define PERLINE 16
 278
 279        int i, count;
 280        unsigned short type[PERLINE];
 281        unsigned long vals[PERLINE], val;
 282        struct net *net = seq->private;
 283
 284        count = 0;
 285        for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 286                val = snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics, i);
 287                if (val) {
 288                        type[count] = i;
 289                        vals[count++] = val;
 290                }
 291                if (count == PERLINE) {
 292                        icmpmsg_put_line(seq, vals, type, count);
 293                        count = 0;
 294                }
 295        }
 296        icmpmsg_put_line(seq, vals, type, count);
 297
 298#undef PERLINE
 299}
 300
 301static void icmp_put(struct seq_file *seq)
 302{
 303        int i;
 304        struct net *net = seq->private;
 305
 306        seq_puts(seq, "\nIcmp: InMsgs InErrors");
 307        for (i=0; icmpmibmap[i].name != NULL; i++)
 308                seq_printf(seq, " In%s", icmpmibmap[i].name);
 309        seq_printf(seq, " OutMsgs OutErrors");
 310        for (i=0; icmpmibmap[i].name != NULL; i++)
 311                seq_printf(seq, " Out%s", icmpmibmap[i].name);
 312        seq_printf(seq, "\nIcmp: %lu %lu",
 313                snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
 314                snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
 315        for (i=0; icmpmibmap[i].name != NULL; i++)
 316                seq_printf(seq, " %lu",
 317                        snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics,
 318                                icmpmibmap[i].index));
 319        seq_printf(seq, " %lu %lu",
 320                snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
 321                snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
 322        for (i=0; icmpmibmap[i].name != NULL; i++)
 323                seq_printf(seq, " %lu",
 324                        snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics,
 325                                icmpmibmap[i].index | 0x100));
 326}
 327
 328/*
 329 *      Called from the PROCfs module. This outputs /proc/net/snmp.
 330 */
 331static int snmp_seq_show(struct seq_file *seq, void *v)
 332{
 333        int i;
 334        struct net *net = seq->private;
 335
 336        seq_puts(seq, "Ip: Forwarding DefaultTTL");
 337
 338        for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 339                seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 340
 341        seq_printf(seq, "\nIp: %d %d",
 342                   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
 343                   sysctl_ip_default_ttl);
 344
 345        for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 346                seq_printf(seq, " %lu",
 347                           snmp_fold_field((void __percpu **)net->mib.ip_statistics,
 348                                           snmp4_ipstats_list[i].entry));
 349
 350        icmp_put(seq);  /* RFC 2011 compatibility */
 351        icmpmsg_put(seq);
 352
 353        seq_puts(seq, "\nTcp:");
 354        for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 355                seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 356
 357        seq_puts(seq, "\nTcp:");
 358        for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 359                /* MaxConn field is signed, RFC 2012 */
 360                if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 361                        seq_printf(seq, " %ld",
 362                                   snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 363                                                   snmp4_tcp_list[i].entry));
 364                else
 365                        seq_printf(seq, " %lu",
 366                                   snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 367                                                   snmp4_tcp_list[i].entry));
 368        }
 369
 370        seq_puts(seq, "\nUdp:");
 371        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 372                seq_printf(seq, " %s", snmp4_udp_list[i].name);
 373
 374        seq_puts(seq, "\nUdp:");
 375        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 376                seq_printf(seq, " %lu",
 377                           snmp_fold_field((void __percpu **)net->mib.udp_statistics,
 378                                           snmp4_udp_list[i].entry));
 379
 380        /* the UDP and UDP-Lite MIBs are the same */
 381        seq_puts(seq, "\nUdpLite:");
 382        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 383                seq_printf(seq, " %s", snmp4_udp_list[i].name);
 384
 385        seq_puts(seq, "\nUdpLite:");
 386        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 387                seq_printf(seq, " %lu",
 388                           snmp_fold_field((void __percpu **)net->mib.udplite_statistics,
 389                                           snmp4_udp_list[i].entry));
 390
 391        seq_putc(seq, '\n');
 392        return 0;
 393}
 394
 395static int snmp_seq_open(struct inode *inode, struct file *file)
 396{
 397        return single_open_net(inode, file, snmp_seq_show);
 398}
 399
 400static const struct file_operations snmp_seq_fops = {
 401        .owner   = THIS_MODULE,
 402        .open    = snmp_seq_open,
 403        .read    = seq_read,
 404        .llseek  = seq_lseek,
 405        .release = single_release_net,
 406};
 407
 408
 409
 410/*
 411 *      Output /proc/net/netstat
 412 */
 413static int netstat_seq_show(struct seq_file *seq, void *v)
 414{
 415        int i;
 416        struct net *net = seq->private;
 417
 418        seq_puts(seq, "TcpExt:");
 419        for (i = 0; snmp4_net_list[i].name != NULL; i++)
 420                seq_printf(seq, " %s", snmp4_net_list[i].name);
 421
 422        seq_puts(seq, "\nTcpExt:");
 423        for (i = 0; snmp4_net_list[i].name != NULL; i++)
 424                seq_printf(seq, " %lu",
 425                           snmp_fold_field((void __percpu **)net->mib.net_statistics,
 426                                           snmp4_net_list[i].entry));
 427
 428        seq_puts(seq, "\nIpExt:");
 429        for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 430                seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 431
 432        seq_puts(seq, "\nIpExt:");
 433        for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 434                seq_printf(seq, " %lu",
 435                           snmp_fold_field((void __percpu **)net->mib.ip_statistics,
 436                                           snmp4_ipextstats_list[i].entry));
 437
 438        seq_putc(seq, '\n');
 439        return 0;
 440}
 441
 442static int netstat_seq_open(struct inode *inode, struct file *file)
 443{
 444        return single_open_net(inode, file, netstat_seq_show);
 445}
 446
 447static const struct file_operations netstat_seq_fops = {
 448        .owner   = THIS_MODULE,
 449        .open    = netstat_seq_open,
 450        .read    = seq_read,
 451        .llseek  = seq_lseek,
 452        .release = single_release_net,
 453};
 454
 455static __net_init int ip_proc_init_net(struct net *net)
 456{
 457        if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 458                goto out_sockstat;
 459        if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
 460                goto out_netstat;
 461        if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
 462                goto out_snmp;
 463
 464        return 0;
 465
 466out_snmp:
 467        proc_net_remove(net, "netstat");
 468out_netstat:
 469        proc_net_remove(net, "sockstat");
 470out_sockstat:
 471        return -ENOMEM;
 472}
 473
 474static __net_exit void ip_proc_exit_net(struct net *net)
 475{
 476        proc_net_remove(net, "snmp");
 477        proc_net_remove(net, "netstat");
 478        proc_net_remove(net, "sockstat");
 479}
 480
 481static __net_initdata struct pernet_operations ip_proc_ops = {
 482        .init = ip_proc_init_net,
 483        .exit = ip_proc_exit_net,
 484};
 485
 486int __init ip_misc_proc_init(void)
 487{
 488        return register_pernet_subsys(&ip_proc_ops);
 489}
 490
 491