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 <linux/export.h>
  46#include <net/sock.h>
  47#include <net/raw.h>
  48
  49/*
  50 *      Report socket allocation statistics [mea@utu.fi]
  51 */
  52static int sockstat_seq_show(struct seq_file *seq, void *v)
  53{
  54        struct net *net = seq->private;
  55        int orphans, sockets;
  56
  57        local_bh_disable();
  58        orphans = percpu_counter_sum_positive(&tcp_orphan_count);
  59        sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
  60        local_bh_enable();
  61
  62        socket_seq_show(seq);
  63        seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
  64                   sock_prot_inuse_get(net, &tcp_prot), orphans,
  65                   tcp_death_row.tw_count, sockets,
  66                   proto_memory_allocated(&tcp_prot));
  67        seq_printf(seq, "UDP: inuse %d mem %ld\n",
  68                   sock_prot_inuse_get(net, &udp_prot),
  69                   proto_memory_allocated(&udp_prot));
  70        seq_printf(seq, "UDPLITE: inuse %d\n",
  71                   sock_prot_inuse_get(net, &udplite_prot));
  72        seq_printf(seq, "RAW: inuse %d\n",
  73                   sock_prot_inuse_get(net, &raw_prot));
  74        seq_printf(seq,  "FRAG: inuse %d memory %d\n",
  75                        ip_frag_nqueues(net), ip_frag_mem(net));
  76        return 0;
  77}
  78
  79static int sockstat_seq_open(struct inode *inode, struct file *file)
  80{
  81        return single_open_net(inode, file, sockstat_seq_show);
  82}
  83
  84static const struct file_operations sockstat_seq_fops = {
  85        .owner   = THIS_MODULE,
  86        .open    = sockstat_seq_open,
  87        .read    = seq_read,
  88        .llseek  = seq_lseek,
  89        .release = single_release_net,
  90};
  91
  92/* snmp items */
  93static 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 RFC4293 items are displayed in /proc/net/netstat */
 115static 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        SNMP_MIB_SENTINEL
 129};
 130
 131static const struct {
 132        const char *name;
 133        int index;
 134} icmpmibmap[] = {
 135        { "DestUnreachs", ICMP_DEST_UNREACH },
 136        { "TimeExcds", ICMP_TIME_EXCEEDED },
 137        { "ParmProbs", ICMP_PARAMETERPROB },
 138        { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 139        { "Redirects", ICMP_REDIRECT },
 140        { "Echos", ICMP_ECHO },
 141        { "EchoReps", ICMP_ECHOREPLY },
 142        { "Timestamps", ICMP_TIMESTAMP },
 143        { "TimestampReps", ICMP_TIMESTAMPREPLY },
 144        { "AddrMasks", ICMP_ADDRESS },
 145        { "AddrMaskReps", ICMP_ADDRESSREPLY },
 146        { NULL, 0 }
 147};
 148
 149
 150static const struct snmp_mib snmp4_tcp_list[] = {
 151        SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 152        SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 153        SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 154        SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 155        SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 156        SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 157        SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 158        SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 159        SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 160        SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 161        SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 162        SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 163        SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 164        SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 165        SNMP_MIB_SENTINEL
 166};
 167
 168static const struct snmp_mib snmp4_udp_list[] = {
 169        SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 170        SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 171        SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 172        SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 173        SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 174        SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 175        SNMP_MIB_SENTINEL
 176};
 177
 178static const struct snmp_mib snmp4_net_list[] = {
 179        SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 180        SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 181        SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 182        SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 183        SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 184        SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 185        SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 186        SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 187        SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 188        SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 189        SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 190        SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 191        SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 192        SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 193        SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 194        SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 195        SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 196        SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 197        SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 198        SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 199        SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 200        SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 201        SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 202        SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 203        SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 204        SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 205        SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 206        SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 207        SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 208        SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 209        SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 210        SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 211        SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 212        SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 213        SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 214        SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 215        SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 216        SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 217        SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 218        SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 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("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 236        SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 237        SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 238        SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 239        SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 240        SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 241        SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 242        SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 243        SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 244        SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 245        SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 246        SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
 247        SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
 248        SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
 249        SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
 250        SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
 251        SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
 252        SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
 253        SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
 254        SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
 255        SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
 256        SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
 257        SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
 258        SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
 259        SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
 260        SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
 261        SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
 262        SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
 263        SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
 264        SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
 265        SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
 266        SNMP_MIB_SENTINEL
 267};
 268
 269static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
 270                             unsigned short *type, int count)
 271{
 272        int j;
 273
 274        if (count) {
 275                seq_printf(seq, "\nIcmpMsg:");
 276                for (j = 0; j < count; ++j)
 277                        seq_printf(seq, " %sType%u",
 278                                type[j] & 0x100 ? "Out" : "In",
 279                                type[j] & 0xff);
 280                seq_printf(seq, "\nIcmpMsg:");
 281                for (j = 0; j < count; ++j)
 282                        seq_printf(seq, " %lu", vals[j]);
 283        }
 284}
 285
 286static void icmpmsg_put(struct seq_file *seq)
 287{
 288#define PERLINE 16
 289
 290        int i, count;
 291        unsigned short type[PERLINE];
 292        unsigned long vals[PERLINE], val;
 293        struct net *net = seq->private;
 294
 295        count = 0;
 296        for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 297                val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
 298                if (val) {
 299                        type[count] = i;
 300                        vals[count++] = val;
 301                }
 302                if (count == PERLINE) {
 303                        icmpmsg_put_line(seq, vals, type, count);
 304                        count = 0;
 305                }
 306        }
 307        icmpmsg_put_line(seq, vals, type, count);
 308
 309#undef PERLINE
 310}
 311
 312static void icmp_put(struct seq_file *seq)
 313{
 314        int i;
 315        struct net *net = seq->private;
 316        atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
 317
 318        seq_puts(seq, "\nIcmp: InMsgs InErrors");
 319        for (i=0; icmpmibmap[i].name != NULL; i++)
 320                seq_printf(seq, " In%s", icmpmibmap[i].name);
 321        seq_printf(seq, " OutMsgs OutErrors");
 322        for (i=0; icmpmibmap[i].name != NULL; i++)
 323                seq_printf(seq, " Out%s", icmpmibmap[i].name);
 324        seq_printf(seq, "\nIcmp: %lu %lu",
 325                snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
 326                snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
 327        for (i=0; icmpmibmap[i].name != NULL; i++)
 328                seq_printf(seq, " %lu",
 329                           atomic_long_read(ptr + icmpmibmap[i].index));
 330        seq_printf(seq, " %lu %lu",
 331                snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
 332                snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
 333        for (i=0; icmpmibmap[i].name != NULL; i++)
 334                seq_printf(seq, " %lu",
 335                           atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
 336}
 337
 338/*
 339 *      Called from the PROCfs module. This outputs /proc/net/snmp.
 340 */
 341static int snmp_seq_show(struct seq_file *seq, void *v)
 342{
 343        int i;
 344        struct net *net = seq->private;
 345
 346        seq_puts(seq, "Ip: Forwarding DefaultTTL");
 347
 348        for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 349                seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 350
 351        seq_printf(seq, "\nIp: %d %d",
 352                   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
 353                   sysctl_ip_default_ttl);
 354
 355        BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
 356        for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 357                seq_printf(seq, " %llu",
 358                           snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
 359                                             snmp4_ipstats_list[i].entry,
 360                                             offsetof(struct ipstats_mib, syncp)));
 361
 362        icmp_put(seq);  /* RFC 2011 compatibility */
 363        icmpmsg_put(seq);
 364
 365        seq_puts(seq, "\nTcp:");
 366        for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 367                seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 368
 369        seq_puts(seq, "\nTcp:");
 370        for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 371                /* MaxConn field is signed, RFC 2012 */
 372                if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 373                        seq_printf(seq, " %ld",
 374                                   snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 375                                                   snmp4_tcp_list[i].entry));
 376                else
 377                        seq_printf(seq, " %lu",
 378                                   snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 379                                                   snmp4_tcp_list[i].entry));
 380        }
 381
 382        seq_puts(seq, "\nUdp:");
 383        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 384                seq_printf(seq, " %s", snmp4_udp_list[i].name);
 385
 386        seq_puts(seq, "\nUdp:");
 387        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 388                seq_printf(seq, " %lu",
 389                           snmp_fold_field((void __percpu **)net->mib.udp_statistics,
 390                                           snmp4_udp_list[i].entry));
 391
 392        /* the UDP and UDP-Lite MIBs are the same */
 393        seq_puts(seq, "\nUdpLite:");
 394        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 395                seq_printf(seq, " %s", snmp4_udp_list[i].name);
 396
 397        seq_puts(seq, "\nUdpLite:");
 398        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 399                seq_printf(seq, " %lu",
 400                           snmp_fold_field((void __percpu **)net->mib.udplite_statistics,
 401                                           snmp4_udp_list[i].entry));
 402
 403        seq_putc(seq, '\n');
 404        return 0;
 405}
 406
 407static int snmp_seq_open(struct inode *inode, struct file *file)
 408{
 409        return single_open_net(inode, file, snmp_seq_show);
 410}
 411
 412static const struct file_operations snmp_seq_fops = {
 413        .owner   = THIS_MODULE,
 414        .open    = snmp_seq_open,
 415        .read    = seq_read,
 416        .llseek  = seq_lseek,
 417        .release = single_release_net,
 418};
 419
 420
 421
 422/*
 423 *      Output /proc/net/netstat
 424 */
 425static int netstat_seq_show(struct seq_file *seq, void *v)
 426{
 427        int i;
 428        struct net *net = seq->private;
 429
 430        seq_puts(seq, "TcpExt:");
 431        for (i = 0; snmp4_net_list[i].name != NULL; i++)
 432                seq_printf(seq, " %s", snmp4_net_list[i].name);
 433
 434        seq_puts(seq, "\nTcpExt:");
 435        for (i = 0; snmp4_net_list[i].name != NULL; i++)
 436                seq_printf(seq, " %lu",
 437                           snmp_fold_field((void __percpu **)net->mib.net_statistics,
 438                                           snmp4_net_list[i].entry));
 439
 440        seq_puts(seq, "\nIpExt:");
 441        for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 442                seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 443
 444        seq_puts(seq, "\nIpExt:");
 445        for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 446                seq_printf(seq, " %llu",
 447                           snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
 448                                             snmp4_ipextstats_list[i].entry,
 449                                             offsetof(struct ipstats_mib, syncp)));
 450
 451        seq_putc(seq, '\n');
 452        return 0;
 453}
 454
 455static int netstat_seq_open(struct inode *inode, struct file *file)
 456{
 457        return single_open_net(inode, file, netstat_seq_show);
 458}
 459
 460static const struct file_operations netstat_seq_fops = {
 461        .owner   = THIS_MODULE,
 462        .open    = netstat_seq_open,
 463        .read    = seq_read,
 464        .llseek  = seq_lseek,
 465        .release = single_release_net,
 466};
 467
 468static __net_init int ip_proc_init_net(struct net *net)
 469{
 470        if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 471                goto out_sockstat;
 472        if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
 473                goto out_netstat;
 474        if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
 475                goto out_snmp;
 476
 477        return 0;
 478
 479out_snmp:
 480        proc_net_remove(net, "netstat");
 481out_netstat:
 482        proc_net_remove(net, "sockstat");
 483out_sockstat:
 484        return -ENOMEM;
 485}
 486
 487static __net_exit void ip_proc_exit_net(struct net *net)
 488{
 489        proc_net_remove(net, "snmp");
 490        proc_net_remove(net, "netstat");
 491        proc_net_remove(net, "sockstat");
 492}
 493
 494static __net_initdata struct pernet_operations ip_proc_ops = {
 495        .init = ip_proc_init_net,
 496        .exit = ip_proc_exit_net,
 497};
 498
 499int __init ip_misc_proc_init(void)
 500{
 501        return register_pernet_subsys(&ip_proc_ops);
 502}
 503
 504
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