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  * Version:     $Id: proc.c,v 1.45 2001/05/16 16:45:35 davem Exp $
  11  *
  12  * Authors:     Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  13  *              Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
  14  *              Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
  15  *              Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
  16  *
  17  * Fixes:
  18  *              Alan Cox        :       UDP sockets show the rxqueue/txqueue
  19  *                                      using hint flag for the netinfo.
  20  *      Pauline Middelink       :       identd support
  21  *              Alan Cox        :       Make /proc safer.
  22  *      Erik Schoenfelder       :       /proc/net/snmp
  23  *              Alan Cox        :       Handle dead sockets properly.
  24  *      Gerhard Koerting        :       Show both timers
  25  *              Alan Cox        :       Allow inode to be NULL (kernel socket)
  26  *      Andi Kleen              :       Add support for open_requests and
  27  *                                      split functions for more readibility.
  28  *      Andi Kleen              :       Add support for /proc/net/netstat
  29  *      Arnaldo C. Melo         :       Convert to seq_file
  30  *
  31  *              This program is free software; you can redistribute it and/or
  32  *              modify it under the terms of the GNU General Public License
  33  *              as published by the Free Software Foundation; either version
  34  *              2 of the License, or (at your option) any later version.
  35  */
  36 #include <linux/types.h>
  37 #include <net/net_namespace.h>
  38 #include <net/icmp.h>
  39 #include <net/protocol.h>
  40 #include <net/tcp.h>
  41 #include <net/udp.h>
  42 #include <net/udplite.h>
  43 #include <linux/inetdevice.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <net/sock.h>
  47 #include <net/raw.h>
  48
  49 static int fold_prot_inuse(struct proto *proto)
  50 {
  51         int res = 0;
  52         int cpu;
  53
  54         for_each_possible_cpu(cpu)
  55                 res += proto->stats[cpu].inuse;
  56
  57         return res;
  58 }
  59
  60 /*
  61  *      Report socket allocation statistics [mea@utu.fi]
  62  */
  63 static int sockstat_seq_show(struct seq_file *seq, void *v)
  64 {
  65         socket_seq_show(seq);
  66         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
  67                    fold_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count),
  68                    tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
  69                    atomic_read(&tcp_memory_allocated));
  70         seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_prot));
  71         seq_printf(seq, "UDPLITE: inuse %d\n", fold_prot_inuse(&udplite_prot));
  72         seq_printf(seq, "RAW: inuse %d\n", fold_prot_inuse(&raw_prot));
  73         seq_printf(seq,  "FRAG: inuse %d memory %d\n", ip_frag_nqueues,
  74                    atomic_read(&ip_frag_mem));
  75         return 0;
  76 }
  77
  78 static int sockstat_seq_open(struct inode *inode, struct file *file)
  79 {
  80         return single_open(file, sockstat_seq_show, NULL);
  81 }
  82
  83 static 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,
  89 };
  90
  91 /* snmp items */
  92 static const struct snmp_mib snmp4_ipstats_list[] = {
  93         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
  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_OUTREQUESTS),
 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 */
 114 static 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_SENTINEL
 122 };
 123
 124 static const struct snmp_mib snmp4_icmp_list[] = {
 125         SNMP_MIB_ITEM("InMsgs", ICMP_MIB_INMSGS),
 126         SNMP_MIB_ITEM("InErrors", ICMP_MIB_INERRORS),
 127         SNMP_MIB_ITEM("OutMsgs", ICMP_MIB_OUTMSGS),
 128         SNMP_MIB_ITEM("OutErrors", ICMP_MIB_OUTERRORS),
 129         SNMP_MIB_SENTINEL
 130 };
 131
 132 static struct {
 133         char *name;
 134         int index;
 135 } icmpmibmap[] = {
 136         { "DestUnreachs", ICMP_DEST_UNREACH },
 137         { "TimeExcds", ICMP_TIME_EXCEEDED },
 138         { "ParmProbs", ICMP_PARAMETERPROB },
 139         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 140         { "Redirects", ICMP_REDIRECT },
 141         { "Echos", ICMP_ECHO },
 142         { "EchoReps", ICMP_ECHOREPLY },
 143         { "Timestamps", ICMP_TIMESTAMP },
 144         { "TimestampReps", ICMP_TIMESTAMPREPLY },
 145         { "AddrMasks", ICMP_ADDRESS },
 146         { "AddrMaskReps", ICMP_ADDRESSREPLY },
 147         { 0, 0 }
 148 };
 149
 150
 151 static const struct snmp_mib snmp4_tcp_list[] = {
 152         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 153         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 154         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 155         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 156         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 157         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 158         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 159         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 160         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 161         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 162         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 163         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 164         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 165         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 166         SNMP_MIB_SENTINEL
 167 };
 168
 169 static const struct snmp_mib snmp4_udp_list[] = {
 170         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 171         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 172         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 173         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 174         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 175         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 176         SNMP_MIB_SENTINEL
 177 };
 178
 179 static const struct snmp_mib snmp4_net_list[] = {
 180         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 181         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 182         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 183         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 184         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 185         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 186         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 187         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 188         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 189         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 190         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 191         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 192         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 193         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 194         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 195         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 196         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 197         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 198         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 199         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 200         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 201         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 202         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 203         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 204         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 205         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 206         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 207         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 208         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 209         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 210         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 211         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 212         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 213         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 214         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 215         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 216         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 217         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 218         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 219         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 220         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 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("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 227         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 228         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 229         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 230         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 231         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 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("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 238         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 239         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 240         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 241         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 242         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 243         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 244         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 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_SENTINEL
 249 };
 250
 251 static void icmpmsg_put(struct seq_file *seq)
 252 {
 253 #define PERLINE 16
 254
 255         int j, i, count;
 256         static int out[PERLINE];
 257
 258         count = 0;
 259         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 260
 261                 if (snmp_fold_field((void **) icmpmsg_statistics, i))
 262                         out[count++] = i;
 263                 if (count < PERLINE)
 264                         continue;
 265
 266                 seq_printf(seq, "\nIcmpMsg:");
 267                 for (j = 0; j < PERLINE; ++j)
 268                         seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
 269                                         i & 0xff);
 270                 seq_printf(seq, "\nIcmpMsg: ");
 271                 for (j = 0; j < PERLINE; ++j)
 272                         seq_printf(seq, " %lu",
 273                                 snmp_fold_field((void **) icmpmsg_statistics,
 274                                 out[j]));
 275                 seq_putc(seq, '\n');
 276         }
 277         if (count) {
 278                 seq_printf(seq, "\nIcmpMsg:");
 279                 for (j = 0; j < count; ++j)
 280                         seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :
 281                                 "In", out[j] & 0xff);
 282                 seq_printf(seq, "\nIcmpMsg:");
 283                 for (j = 0; j < count; ++j)
 284                         seq_printf(seq, " %lu", snmp_fold_field((void **)
 285                                 icmpmsg_statistics, out[j]));
 286         }
 287
 288 #undef PERLINE
 289 }
 290
 291 static void icmp_put(struct seq_file *seq)
 292 {
 293         int i;
 294
 295         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 296         for (i=0; icmpmibmap[i].name != NULL; i++)
 297                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 298         seq_printf(seq, " OutMsgs OutErrors");
 299         for (i=0; icmpmibmap[i].name != NULL; i++)
 300                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 301         seq_printf(seq, "\nIcmp: %lu %lu",
 302                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),
 303                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));
 304         for (i=0; icmpmibmap[i].name != NULL; i++)
 305                 seq_printf(seq, " %lu",
 306                         snmp_fold_field((void **) icmpmsg_statistics,
 307                                 icmpmibmap[i].index));
 308         seq_printf(seq, " %lu %lu",
 309                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),
 310                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));
 311         for (i=0; icmpmibmap[i].name != NULL; i++)
 312                 seq_printf(seq, " %lu",
 313                         snmp_fold_field((void **) icmpmsg_statistics,
 314                                 icmpmibmap[i].index));
 315 }
 316
 317 /*
 318  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 319  */
 320 static int snmp_seq_show(struct seq_file *seq, void *v)
 321 {
 322         int i;
 323
 324         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 325
 326         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 327                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 328
 329         seq_printf(seq, "\nIp: %d %d",
 330                    IPV4_DEVCONF_ALL(FORWARDING) ? 1 : 2, sysctl_ip_default_ttl);
 331
 332         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 333                 seq_printf(seq, " %lu",
 334                            snmp_fold_field((void **)ip_statistics,
 335                                            snmp4_ipstats_list[i].entry));
 336
 337         icmp_put(seq);  /* RFC 2011 compatibility */
 338         icmpmsg_put(seq);
 339
 340         seq_puts(seq, "\nTcp:");
 341         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 342                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 343
 344         seq_puts(seq, "\nTcp:");
 345         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 346                 /* MaxConn field is signed, RFC 2012 */
 347                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 348                         seq_printf(seq, " %ld",
 349                                    snmp_fold_field((void **)tcp_statistics,
 350                                                    snmp4_tcp_list[i].entry));
 351                 else
 352                         seq_printf(seq, " %lu",
 353                                    snmp_fold_field((void **)tcp_statistics,
 354                                                    snmp4_tcp_list[i].entry));
 355         }
 356
 357         seq_puts(seq, "\nUdp:");
 358         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 359                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 360
 361         seq_puts(seq, "\nUdp:");
 362         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 363                 seq_printf(seq, " %lu",
 364                            snmp_fold_field((void **)udp_statistics,
 365                                            snmp4_udp_list[i].entry));
 366
 367         /* the UDP and UDP-Lite MIBs are the same */
 368         seq_puts(seq, "\nUdpLite:");
 369         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 370                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 371
 372         seq_puts(seq, "\nUdpLite:");
 373         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 374                 seq_printf(seq, " %lu",
 375                            snmp_fold_field((void **)udplite_statistics,
 376                                            snmp4_udp_list[i].entry));
 377
 378         seq_putc(seq, '\n');
 379         return 0;
 380 }
 381
 382 static int snmp_seq_open(struct inode *inode, struct file *file)
 383 {
 384         return single_open(file, snmp_seq_show, NULL);
 385 }
 386
 387 static const struct file_operations snmp_seq_fops = {
 388         .owner   = THIS_MODULE,
 389         .open    = snmp_seq_open,
 390         .read    = seq_read,
 391         .llseek  = seq_lseek,
 392         .release = single_release,
 393 };
 394
 395
 396
 397 /*
 398  *      Output /proc/net/netstat
 399  */
 400 static int netstat_seq_show(struct seq_file *seq, void *v)
 401 {
 402         int i;
 403
 404         seq_puts(seq, "TcpExt:");
 405         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 406                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 407
 408         seq_puts(seq, "\nTcpExt:");
 409         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 410                 seq_printf(seq, " %lu",
 411                            snmp_fold_field((void **)net_statistics,
 412                                            snmp4_net_list[i].entry));
 413
 414         seq_puts(seq, "\nIpExt:");
 415         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 416                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 417
 418         seq_puts(seq, "\nIpExt:");
 419         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 420                 seq_printf(seq, " %lu",
 421                            snmp_fold_field((void **)ip_statistics,
 422                                            snmp4_ipextstats_list[i].entry));
 423
 424         seq_putc(seq, '\n');
 425         return 0;
 426 }
 427
 428 static int netstat_seq_open(struct inode *inode, struct file *file)
 429 {
 430         return single_open(file, netstat_seq_show, NULL);
 431 }
 432
 433 static const struct file_operations netstat_seq_fops = {
 434         .owner   = THIS_MODULE,
 435         .open    = netstat_seq_open,
 436         .read    = seq_read,
 437         .llseek  = seq_lseek,
 438         .release = single_release,
 439 };
 440
 441 int __init ip_misc_proc_init(void)
 442 {
 443         int rc = 0;
 444
 445         if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
 446                 goto out_netstat;
 447
 448         if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
 449                 goto out_snmp;
 450
 451         if (!proc_net_fops_create(&init_net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 452                 goto out_sockstat;
 453 out:
 454         return rc;
 455 out_sockstat:
 456         proc_net_remove(&init_net, "snmp");
 457 out_snmp:
 458         proc_net_remove(&init_net, "netstat");
 459 out_netstat:
 460         rc = -ENOMEM;
 461         goto out;
 462 }
 463