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/icmp.h>
  38 #include <net/protocol.h>
  39 #include <net/tcp.h>
  40 #include <net/udp.h>
  41 #include <net/udplite.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 static int fold_prot_inuse(struct proto *proto)
  49 {
  50         int res = 0;
  51         int cpu;
  52
  53         for_each_possible_cpu(cpu)
  54                 res += proto->stats[cpu].inuse;
  55
  56         return res;
  57 }
  58
  59 /*
  60  *      Report socket allocation statistics [mea@utu.fi]
  61  */
  62 static int sockstat_seq_show(struct seq_file *seq, void *v)
  63 {
  64         socket_seq_show(seq);
  65         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
  66                    fold_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count),
  67                    tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
  68                    atomic_read(&tcp_memory_allocated));
  69         seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_prot));
  70         seq_printf(seq, "UDPLITE: inuse %d\n", fold_prot_inuse(&udplite_prot));
  71         seq_printf(seq, "RAW: inuse %d\n", fold_prot_inuse(&raw_prot));
  72         seq_printf(seq,  "FRAG: inuse %d memory %d\n", ip_frag_nqueues,
  73                    atomic_read(&ip_frag_mem));
  74         return 0;
  75 }
  76
  77 static int sockstat_seq_open(struct inode *inode, struct file *file)
  78 {
  79         return single_open(file, sockstat_seq_show, NULL);
  80 }
  81
  82 static const struct file_operations sockstat_seq_fops = {
  83         .owner   = THIS_MODULE,
  84         .open    = sockstat_seq_open,
  85         .read    = seq_read,
  86         .llseek  = seq_lseek,
  87         .release = single_release,
  88 };
  89
  90 /* snmp items */
  91 static const struct snmp_mib snmp4_ipstats_list[] = {
  92         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
  93         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  94         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  95         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  96         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  97         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
  98         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
  99         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
 100         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 101         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 102         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 103         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
 104         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
 105         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
 106         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
 107         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 108         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 109         SNMP_MIB_SENTINEL
 110 };
 111
 112 /* Following RFC4293 items are displayed in /proc/net/netstat */
 113 static const struct snmp_mib snmp4_ipextstats_list[] = {
 114         SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 115         SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 116         SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 117         SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 118         SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 119         SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 120         SNMP_MIB_SENTINEL
 121 };
 122
 123 static const struct snmp_mib snmp4_icmp_list[] = {
 124         SNMP_MIB_ITEM("InMsgs", ICMP_MIB_INMSGS),
 125         SNMP_MIB_ITEM("InErrors", ICMP_MIB_INERRORS),
 126         SNMP_MIB_ITEM("InDestUnreachs", ICMP_MIB_INDESTUNREACHS),
 127         SNMP_MIB_ITEM("InTimeExcds", ICMP_MIB_INTIMEEXCDS),
 128         SNMP_MIB_ITEM("InParmProbs", ICMP_MIB_INPARMPROBS),
 129         SNMP_MIB_ITEM("InSrcQuenchs", ICMP_MIB_INSRCQUENCHS),
 130         SNMP_MIB_ITEM("InRedirects", ICMP_MIB_INREDIRECTS),
 131         SNMP_MIB_ITEM("InEchos", ICMP_MIB_INECHOS),
 132         SNMP_MIB_ITEM("InEchoReps", ICMP_MIB_INECHOREPS),
 133         SNMP_MIB_ITEM("InTimestamps", ICMP_MIB_INTIMESTAMPS),
 134         SNMP_MIB_ITEM("InTimestampReps", ICMP_MIB_INTIMESTAMPREPS),
 135         SNMP_MIB_ITEM("InAddrMasks", ICMP_MIB_INADDRMASKS),
 136         SNMP_MIB_ITEM("InAddrMaskReps", ICMP_MIB_INADDRMASKREPS),
 137         SNMP_MIB_ITEM("OutMsgs", ICMP_MIB_OUTMSGS),
 138         SNMP_MIB_ITEM("OutErrors", ICMP_MIB_OUTERRORS),
 139         SNMP_MIB_ITEM("OutDestUnreachs", ICMP_MIB_OUTDESTUNREACHS),
 140         SNMP_MIB_ITEM("OutTimeExcds", ICMP_MIB_OUTTIMEEXCDS),
 141         SNMP_MIB_ITEM("OutParmProbs", ICMP_MIB_OUTPARMPROBS),
 142         SNMP_MIB_ITEM("OutSrcQuenchs", ICMP_MIB_OUTSRCQUENCHS),
 143         SNMP_MIB_ITEM("OutRedirects", ICMP_MIB_OUTREDIRECTS),
 144         SNMP_MIB_ITEM("OutEchos", ICMP_MIB_OUTECHOS),
 145         SNMP_MIB_ITEM("OutEchoReps", ICMP_MIB_OUTECHOREPS),
 146         SNMP_MIB_ITEM("OutTimestamps", ICMP_MIB_OUTTIMESTAMPS),
 147         SNMP_MIB_ITEM("OutTimestampReps", ICMP_MIB_OUTTIMESTAMPREPS),
 148         SNMP_MIB_ITEM("OutAddrMasks", ICMP_MIB_OUTADDRMASKS),
 149         SNMP_MIB_ITEM("OutAddrMaskReps", ICMP_MIB_OUTADDRMASKREPS),
 150         SNMP_MIB_SENTINEL
 151 };
 152
 153 static const struct snmp_mib snmp4_tcp_list[] = {
 154         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 155         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 156         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 157         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 158         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 159         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 160         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 161         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 162         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 163         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 164         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 165         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 166         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 167         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 168         SNMP_MIB_SENTINEL
 169 };
 170
 171 static const struct snmp_mib snmp4_udp_list[] = {
 172         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 173         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 174         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 175         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 176         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 177         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 178         SNMP_MIB_SENTINEL
 179 };
 180
 181 static const struct snmp_mib snmp4_net_list[] = {
 182         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 183         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 184         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 185         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 186         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 187         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 188         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 189         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 190         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 191         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 192         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 193         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 194         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 195         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 196         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 197         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 198         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 199         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 200         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 201         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 202         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 203         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 204         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 205         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 206         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 207         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 208         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 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("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 215         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 216         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 217         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 218         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 219         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 220         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 221         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 222         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 223         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 224         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 225         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 226         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 227         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 228         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 229         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 230         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 231         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 232         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 233         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 234         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 235         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 236         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 237         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 238         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 239         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 240         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 241         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 242         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 243         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 244         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 245         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 246         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 247         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 248         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 249         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 250         SNMP_MIB_SENTINEL
 251 };
 252
 253 /*
 254  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 255  */
 256 static int snmp_seq_show(struct seq_file *seq, void *v)
 257 {
 258         int i;
 259
 260         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 261
 262         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 263                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 264
 265         seq_printf(seq, "\nIp: %d %d",
 266                    IPV4_DEVCONF_ALL(FORWARDING) ? 1 : 2, sysctl_ip_default_ttl);
 267
 268         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 269                 seq_printf(seq, " %lu",
 270                            snmp_fold_field((void **)ip_statistics,
 271                                            snmp4_ipstats_list[i].entry));
 272
 273         seq_puts(seq, "\nIcmp:");
 274         for (i = 0; snmp4_icmp_list[i].name != NULL; i++)
 275                 seq_printf(seq, " %s", snmp4_icmp_list[i].name);
 276
 277         seq_puts(seq, "\nIcmp:");
 278         for (i = 0; snmp4_icmp_list[i].name != NULL; i++)
 279                 seq_printf(seq, " %lu",
 280                            snmp_fold_field((void **)icmp_statistics,
 281                                            snmp4_icmp_list[i].entry));
 282
 283         seq_puts(seq, "\nTcp:");
 284         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 285                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 286
 287         seq_puts(seq, "\nTcp:");
 288         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 289                 /* MaxConn field is signed, RFC 2012 */
 290                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 291                         seq_printf(seq, " %ld",
 292                                    snmp_fold_field((void **)tcp_statistics,
 293                                                    snmp4_tcp_list[i].entry));
 294                 else
 295                         seq_printf(seq, " %lu",
 296                                    snmp_fold_field((void **)tcp_statistics,
 297                                                    snmp4_tcp_list[i].entry));
 298         }
 299
 300         seq_puts(seq, "\nUdp:");
 301         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 302                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 303
 304         seq_puts(seq, "\nUdp:");
 305         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 306                 seq_printf(seq, " %lu",
 307                            snmp_fold_field((void **)udp_statistics,
 308                                            snmp4_udp_list[i].entry));
 309
 310         /* the UDP and UDP-Lite MIBs are the same */
 311         seq_puts(seq, "\nUdpLite:");
 312         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 313                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 314
 315         seq_puts(seq, "\nUdpLite:");
 316         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 317                 seq_printf(seq, " %lu",
 318                            snmp_fold_field((void **)udplite_statistics,
 319                                            snmp4_udp_list[i].entry));
 320
 321         seq_putc(seq, '\n');
 322         return 0;
 323 }
 324
 325 static int snmp_seq_open(struct inode *inode, struct file *file)
 326 {
 327         return single_open(file, snmp_seq_show, NULL);
 328 }
 329
 330 static const struct file_operations snmp_seq_fops = {
 331         .owner   = THIS_MODULE,
 332         .open    = snmp_seq_open,
 333         .read    = seq_read,
 334         .llseek  = seq_lseek,
 335         .release = single_release,
 336 };
 337
 338 /*
 339  *      Output /proc/net/netstat
 340  */
 341 static int netstat_seq_show(struct seq_file *seq, void *v)
 342 {
 343         int i;
 344
 345         seq_puts(seq, "TcpExt:");
 346         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 347                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 348
 349         seq_puts(seq, "\nTcpExt:");
 350         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 351                 seq_printf(seq, " %lu",
 352                            snmp_fold_field((void **)net_statistics,
 353                                            snmp4_net_list[i].entry));
 354
 355         seq_puts(seq, "\nIpExt:");
 356         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 357                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 358
 359         seq_puts(seq, "\nIpExt:");
 360         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 361                 seq_printf(seq, " %lu",
 362                            snmp_fold_field((void **)ip_statistics,
 363                                            snmp4_ipextstats_list[i].entry));
 364
 365         seq_putc(seq, '\n');
 366         return 0;
 367 }
 368
 369 static int netstat_seq_open(struct inode *inode, struct file *file)
 370 {
 371         return single_open(file, netstat_seq_show, NULL);
 372 }
 373
 374 static const struct file_operations netstat_seq_fops = {
 375         .owner   = THIS_MODULE,
 376         .open    = netstat_seq_open,
 377         .read    = seq_read,
 378         .llseek  = seq_lseek,
 379         .release = single_release,
 380 };
 381
 382 int __init ip_misc_proc_init(void)
 383 {
 384         int rc = 0;
 385
 386         if (!proc_net_fops_create("netstat", S_IRUGO, &netstat_seq_fops))
 387                 goto out_netstat;
 388
 389         if (!proc_net_fops_create("snmp", S_IRUGO, &snmp_seq_fops))
 390                 goto out_snmp;
 391
 392         if (!proc_net_fops_create("sockstat", S_IRUGO, &sockstat_seq_fops))
 393                 goto out_sockstat;
 394 out:
 395         return rc;
 396 out_sockstat:
 397         proc_net_remove("snmp");
 398 out_snmp:
 399         proc_net_remove("netstat");
 400 out_netstat:
 401         rc = -ENOMEM;
 402         goto out;
 403 }
 404