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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  * 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",
  74                         ip_frag_nqueues(), 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 struct {
 125         char *name;
 126         int index;
 127 } icmpmibmap[] = {
 128         { "DestUnreachs", ICMP_DEST_UNREACH },
 129         { "TimeExcds", ICMP_TIME_EXCEEDED },
 130         { "ParmProbs", ICMP_PARAMETERPROB },
 131         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 132         { "Redirects", ICMP_REDIRECT },
 133         { "Echos", ICMP_ECHO },
 134         { "EchoReps", ICMP_ECHOREPLY },
 135         { "Timestamps", ICMP_TIMESTAMP },
 136         { "TimestampReps", ICMP_TIMESTAMPREPLY },
 137         { "AddrMasks", ICMP_ADDRESS },
 138         { "AddrMaskReps", ICMP_ADDRESSREPLY },
 139         { NULL, 0 }
 140 };
 141
 142
 143 static const struct snmp_mib snmp4_tcp_list[] = {
 144         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 145         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 146         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 147         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 148         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 149         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 150         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 151         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 152         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 153         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 154         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 155         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 156         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 157         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 158         SNMP_MIB_SENTINEL
 159 };
 160
 161 static const struct snmp_mib snmp4_udp_list[] = {
 162         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 163         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 164         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 165         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 166         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 167         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 168         SNMP_MIB_SENTINEL
 169 };
 170
 171 static const struct snmp_mib snmp4_net_list[] = {
 172         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 173         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 174         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 175         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 176         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 177         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 178         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 179         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 180         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 181         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 182         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 183         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 184         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 185         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 186         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 187         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 188         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 189         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 190         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 191         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 192         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 193         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 194         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 195         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 196         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 197         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 198         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 199         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 200         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 201         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 202         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 203         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 204         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 205         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 206         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 207         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 208         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 209         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 210         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 211         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 212         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 213         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 214         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 215         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 216         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 217         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 218         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 219         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 220         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 221         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 222         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 223         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 224         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 225         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 226         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 227         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 228         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 229         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 230         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 231         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 232         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 233         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 234         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 235         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 236         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 237         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 238         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 239         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 240         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 241         SNMP_MIB_SENTINEL
 242 };
 243
 244 static void icmpmsg_put(struct seq_file *seq)
 245 {
 246 #define PERLINE 16
 247
 248         int j, i, count;
 249         static int out[PERLINE];
 250
 251         count = 0;
 252         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 253
 254                 if (snmp_fold_field((void **) icmpmsg_statistics, i))
 255                         out[count++] = i;
 256                 if (count < PERLINE)
 257                         continue;
 258
 259                 seq_printf(seq, "\nIcmpMsg:");
 260                 for (j = 0; j < PERLINE; ++j)
 261                         seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
 262                                         i & 0xff);
 263                 seq_printf(seq, "\nIcmpMsg: ");
 264                 for (j = 0; j < PERLINE; ++j)
 265                         seq_printf(seq, " %lu",
 266                                 snmp_fold_field((void **) icmpmsg_statistics,
 267                                 out[j]));
 268                 seq_putc(seq, '\n');
 269         }
 270         if (count) {
 271                 seq_printf(seq, "\nIcmpMsg:");
 272                 for (j = 0; j < count; ++j)
 273                         seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :
 274                                 "In", out[j] & 0xff);
 275                 seq_printf(seq, "\nIcmpMsg:");
 276                 for (j = 0; j < count; ++j)
 277                         seq_printf(seq, " %lu", snmp_fold_field((void **)
 278                                 icmpmsg_statistics, out[j]));
 279         }
 280
 281 #undef PERLINE
 282 }
 283
 284 static void icmp_put(struct seq_file *seq)
 285 {
 286         int i;
 287
 288         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 289         for (i=0; icmpmibmap[i].name != NULL; i++)
 290                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 291         seq_printf(seq, " OutMsgs OutErrors");
 292         for (i=0; icmpmibmap[i].name != NULL; i++)
 293                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 294         seq_printf(seq, "\nIcmp: %lu %lu",
 295                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),
 296                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));
 297         for (i=0; icmpmibmap[i].name != NULL; i++)
 298                 seq_printf(seq, " %lu",
 299                         snmp_fold_field((void **) icmpmsg_statistics,
 300                                 icmpmibmap[i].index));
 301         seq_printf(seq, " %lu %lu",
 302                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),
 303                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));
 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 | 0x100));
 308 }
 309
 310 /*
 311  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 312  */
 313 static int snmp_seq_show(struct seq_file *seq, void *v)
 314 {
 315         int i;
 316
 317         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 318
 319         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 320                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 321
 322         seq_printf(seq, "\nIp: %d %d",
 323                    IPV4_DEVCONF_ALL(FORWARDING) ? 1 : 2, sysctl_ip_default_ttl);
 324
 325         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 326                 seq_printf(seq, " %lu",
 327                            snmp_fold_field((void **)ip_statistics,
 328                                            snmp4_ipstats_list[i].entry));
 329
 330         icmp_put(seq);  /* RFC 2011 compatibility */
 331         icmpmsg_put(seq);
 332
 333         seq_puts(seq, "\nTcp:");
 334         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 335                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 336
 337         seq_puts(seq, "\nTcp:");
 338         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 339                 /* MaxConn field is signed, RFC 2012 */
 340                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 341                         seq_printf(seq, " %ld",
 342                                    snmp_fold_field((void **)tcp_statistics,
 343                                                    snmp4_tcp_list[i].entry));
 344                 else
 345                         seq_printf(seq, " %lu",
 346                                    snmp_fold_field((void **)tcp_statistics,
 347                                                    snmp4_tcp_list[i].entry));
 348         }
 349
 350         seq_puts(seq, "\nUdp:");
 351         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 352                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 353
 354         seq_puts(seq, "\nUdp:");
 355         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 356                 seq_printf(seq, " %lu",
 357                            snmp_fold_field((void **)udp_statistics,
 358                                            snmp4_udp_list[i].entry));
 359
 360         /* the UDP and UDP-Lite MIBs are the same */
 361         seq_puts(seq, "\nUdpLite:");
 362         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 363                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 364
 365         seq_puts(seq, "\nUdpLite:");
 366         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 367                 seq_printf(seq, " %lu",
 368                            snmp_fold_field((void **)udplite_statistics,
 369                                            snmp4_udp_list[i].entry));
 370
 371         seq_putc(seq, '\n');
 372         return 0;
 373 }
 374
 375 static int snmp_seq_open(struct inode *inode, struct file *file)
 376 {
 377         return single_open(file, snmp_seq_show, NULL);
 378 }
 379
 380 static const struct file_operations snmp_seq_fops = {
 381         .owner   = THIS_MODULE,
 382         .open    = snmp_seq_open,
 383         .read    = seq_read,
 384         .llseek  = seq_lseek,
 385         .release = single_release,
 386 };
 387
 388
 389
 390 /*
 391  *      Output /proc/net/netstat
 392  */
 393 static int netstat_seq_show(struct seq_file *seq, void *v)
 394 {
 395         int i;
 396
 397         seq_puts(seq, "TcpExt:");
 398         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 399                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 400
 401         seq_puts(seq, "\nTcpExt:");
 402         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 403                 seq_printf(seq, " %lu",
 404                            snmp_fold_field((void **)net_statistics,
 405                                            snmp4_net_list[i].entry));
 406
 407         seq_puts(seq, "\nIpExt:");
 408         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 409                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 410
 411         seq_puts(seq, "\nIpExt:");
 412         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 413                 seq_printf(seq, " %lu",
 414                            snmp_fold_field((void **)ip_statistics,
 415                                            snmp4_ipextstats_list[i].entry));
 416
 417         seq_putc(seq, '\n');
 418         return 0;
 419 }
 420
 421 static int netstat_seq_open(struct inode *inode, struct file *file)
 422 {
 423         return single_open(file, netstat_seq_show, NULL);
 424 }
 425
 426 static const struct file_operations netstat_seq_fops = {
 427         .owner   = THIS_MODULE,
 428         .open    = netstat_seq_open,
 429         .read    = seq_read,
 430         .llseek  = seq_lseek,
 431         .release = single_release,
 432 };
 433
 434 int __init ip_misc_proc_init(void)
 435 {
 436         int rc = 0;
 437
 438         if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
 439                 goto out_netstat;
 440
 441         if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
 442                 goto out_snmp;
 443
 444         if (!proc_net_fops_create(&init_net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 445                 goto out_sockstat;
 446 out:
 447         return rc;
 448 out_sockstat:
 449         proc_net_remove(&init_net, "snmp");
 450 out_snmp:
 451         proc_net_remove(&init_net, "netstat");
 452 out_netstat:
 453         rc = -ENOMEM;
 454         goto out;
 455 }
 456