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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 /*
  50  *      Report socket allocation statistics [mea@utu.fi]
  51  */
  52 static int sockstat_seq_show(struct seq_file *seq, void *v)
  53 {
  54         socket_seq_show(seq);
  55         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
  56                    sock_prot_inuse_get(&tcp_prot),
  57                    atomic_read(&tcp_orphan_count),
  58                    tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
  59                    atomic_read(&tcp_memory_allocated));
  60         seq_printf(seq, "UDP: inuse %d mem %d\n", sock_prot_inuse_get(&udp_prot),
  61                    atomic_read(&udp_memory_allocated));
  62         seq_printf(seq, "UDPLITE: inuse %d\n", sock_prot_inuse_get(&udplite_prot));
  63         seq_printf(seq, "RAW: inuse %d\n", sock_prot_inuse_get(&raw_prot));
  64         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
  65                         ip_frag_nqueues(&init_net), ip_frag_mem(&init_net));
  66         return 0;
  67 }
  68
  69 static int sockstat_seq_open(struct inode *inode, struct file *file)
  70 {
  71         return single_open(file, sockstat_seq_show, NULL);
  72 }
  73
  74 static const struct file_operations sockstat_seq_fops = {
  75         .owner   = THIS_MODULE,
  76         .open    = sockstat_seq_open,
  77         .read    = seq_read,
  78         .llseek  = seq_lseek,
  79         .release = single_release,
  80 };
  81
  82 /* snmp items */
  83 static const struct snmp_mib snmp4_ipstats_list[] = {
  84         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
  85         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  86         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  87         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  88         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  89         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
  90         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
  91         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
  92         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
  93         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
  94         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
  95         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
  96         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
  97         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
  98         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
  99         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 100         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 101         SNMP_MIB_SENTINEL
 102 };
 103
 104 /* Following RFC4293 items are displayed in /proc/net/netstat */
 105 static const struct snmp_mib snmp4_ipextstats_list[] = {
 106         SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 107         SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 108         SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 109         SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 110         SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 111         SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 112         SNMP_MIB_SENTINEL
 113 };
 114
 115 static struct {
 116         char *name;
 117         int index;
 118 } icmpmibmap[] = {
 119         { "DestUnreachs", ICMP_DEST_UNREACH },
 120         { "TimeExcds", ICMP_TIME_EXCEEDED },
 121         { "ParmProbs", ICMP_PARAMETERPROB },
 122         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 123         { "Redirects", ICMP_REDIRECT },
 124         { "Echos", ICMP_ECHO },
 125         { "EchoReps", ICMP_ECHOREPLY },
 126         { "Timestamps", ICMP_TIMESTAMP },
 127         { "TimestampReps", ICMP_TIMESTAMPREPLY },
 128         { "AddrMasks", ICMP_ADDRESS },
 129         { "AddrMaskReps", ICMP_ADDRESSREPLY },
 130         { NULL, 0 }
 131 };
 132
 133
 134 static const struct snmp_mib snmp4_tcp_list[] = {
 135         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 136         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 137         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 138         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 139         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 140         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 141         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 142         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 143         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 144         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 145         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 146         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 147         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 148         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 149         SNMP_MIB_SENTINEL
 150 };
 151
 152 static const struct snmp_mib snmp4_udp_list[] = {
 153         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 154         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 155         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 156         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 157         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 158         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 159         SNMP_MIB_SENTINEL
 160 };
 161
 162 static const struct snmp_mib snmp4_net_list[] = {
 163         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 164         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 165         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 166         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 167         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 168         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 169         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 170         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 171         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 172         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 173         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 174         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 175         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 176         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 177         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 178         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 179         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 180         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 181         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 182         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 183         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 184         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 185         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 186         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 187         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 188         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 189         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 190         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 191         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 192         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 193         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 194         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 195         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 196         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 197         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 198         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 199         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 200         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 201         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 202         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 203         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 204         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 205         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 206         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 207         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 208         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 209         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 210         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 211         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 212         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 213         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 214         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 215         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 216         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 217         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 218         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 219         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 220         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 221         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 222         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 223         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 224         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 225         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 226         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 227         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 228         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 229         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 230         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 231         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 232         SNMP_MIB_SENTINEL
 233 };
 234
 235 static void icmpmsg_put(struct seq_file *seq)
 236 {
 237 #define PERLINE 16
 238
 239         int j, i, count;
 240         static int out[PERLINE];
 241
 242         count = 0;
 243         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 244
 245                 if (snmp_fold_field((void **) icmpmsg_statistics, i))
 246                         out[count++] = i;
 247                 if (count < PERLINE)
 248                         continue;
 249
 250                 seq_printf(seq, "\nIcmpMsg:");
 251                 for (j = 0; j < PERLINE; ++j)
 252                         seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
 253                                         i & 0xff);
 254                 seq_printf(seq, "\nIcmpMsg: ");
 255                 for (j = 0; j < PERLINE; ++j)
 256                         seq_printf(seq, " %lu",
 257                                 snmp_fold_field((void **) icmpmsg_statistics,
 258                                 out[j]));
 259                 seq_putc(seq, '\n');
 260         }
 261         if (count) {
 262                 seq_printf(seq, "\nIcmpMsg:");
 263                 for (j = 0; j < count; ++j)
 264                         seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :
 265                                 "In", out[j] & 0xff);
 266                 seq_printf(seq, "\nIcmpMsg:");
 267                 for (j = 0; j < count; ++j)
 268                         seq_printf(seq, " %lu", snmp_fold_field((void **)
 269                                 icmpmsg_statistics, out[j]));
 270         }
 271
 272 #undef PERLINE
 273 }
 274
 275 static void icmp_put(struct seq_file *seq)
 276 {
 277         int i;
 278
 279         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 280         for (i=0; icmpmibmap[i].name != NULL; i++)
 281                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 282         seq_printf(seq, " OutMsgs OutErrors");
 283         for (i=0; icmpmibmap[i].name != NULL; i++)
 284                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 285         seq_printf(seq, "\nIcmp: %lu %lu",
 286                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),
 287                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));
 288         for (i=0; icmpmibmap[i].name != NULL; i++)
 289                 seq_printf(seq, " %lu",
 290                         snmp_fold_field((void **) icmpmsg_statistics,
 291                                 icmpmibmap[i].index));
 292         seq_printf(seq, " %lu %lu",
 293                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),
 294                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));
 295         for (i=0; icmpmibmap[i].name != NULL; i++)
 296                 seq_printf(seq, " %lu",
 297                         snmp_fold_field((void **) icmpmsg_statistics,
 298                                 icmpmibmap[i].index | 0x100));
 299 }
 300
 301 /*
 302  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 303  */
 304 static int snmp_seq_show(struct seq_file *seq, void *v)
 305 {
 306         int i;
 307
 308         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 309
 310         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 311                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 312
 313         seq_printf(seq, "\nIp: %d %d",
 314                    IPV4_DEVCONF_ALL(&init_net, FORWARDING) ? 1 : 2,
 315                    sysctl_ip_default_ttl);
 316
 317         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 318                 seq_printf(seq, " %lu",
 319                            snmp_fold_field((void **)ip_statistics,
 320                                            snmp4_ipstats_list[i].entry));
 321
 322         icmp_put(seq);  /* RFC 2011 compatibility */
 323         icmpmsg_put(seq);
 324
 325         seq_puts(seq, "\nTcp:");
 326         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 327                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 328
 329         seq_puts(seq, "\nTcp:");
 330         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 331                 /* MaxConn field is signed, RFC 2012 */
 332                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 333                         seq_printf(seq, " %ld",
 334                                    snmp_fold_field((void **)tcp_statistics,
 335                                                    snmp4_tcp_list[i].entry));
 336                 else
 337                         seq_printf(seq, " %lu",
 338                                    snmp_fold_field((void **)tcp_statistics,
 339                                                    snmp4_tcp_list[i].entry));
 340         }
 341
 342         seq_puts(seq, "\nUdp:");
 343         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 344                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 345
 346         seq_puts(seq, "\nUdp:");
 347         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 348                 seq_printf(seq, " %lu",
 349                            snmp_fold_field((void **)udp_statistics,
 350                                            snmp4_udp_list[i].entry));
 351
 352         /* the UDP and UDP-Lite MIBs are the same */
 353         seq_puts(seq, "\nUdpLite:");
 354         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 355                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 356
 357         seq_puts(seq, "\nUdpLite:");
 358         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 359                 seq_printf(seq, " %lu",
 360                            snmp_fold_field((void **)udplite_statistics,
 361                                            snmp4_udp_list[i].entry));
 362
 363         seq_putc(seq, '\n');
 364         return 0;
 365 }
 366
 367 static int snmp_seq_open(struct inode *inode, struct file *file)
 368 {
 369         return single_open(file, snmp_seq_show, NULL);
 370 }
 371
 372 static const struct file_operations snmp_seq_fops = {
 373         .owner   = THIS_MODULE,
 374         .open    = snmp_seq_open,
 375         .read    = seq_read,
 376         .llseek  = seq_lseek,
 377         .release = single_release,
 378 };
 379
 380
 381
 382 /*
 383  *      Output /proc/net/netstat
 384  */
 385 static int netstat_seq_show(struct seq_file *seq, void *v)
 386 {
 387         int i;
 388
 389         seq_puts(seq, "TcpExt:");
 390         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 391                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 392
 393         seq_puts(seq, "\nTcpExt:");
 394         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 395                 seq_printf(seq, " %lu",
 396                            snmp_fold_field((void **)net_statistics,
 397                                            snmp4_net_list[i].entry));
 398
 399         seq_puts(seq, "\nIpExt:");
 400         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 401                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 402
 403         seq_puts(seq, "\nIpExt:");
 404         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 405                 seq_printf(seq, " %lu",
 406                            snmp_fold_field((void **)ip_statistics,
 407                                            snmp4_ipextstats_list[i].entry));
 408
 409         seq_putc(seq, '\n');
 410         return 0;
 411 }
 412
 413 static int netstat_seq_open(struct inode *inode, struct file *file)
 414 {
 415         return single_open(file, netstat_seq_show, NULL);
 416 }
 417
 418 static const struct file_operations netstat_seq_fops = {
 419         .owner   = THIS_MODULE,
 420         .open    = netstat_seq_open,
 421         .read    = seq_read,
 422         .llseek  = seq_lseek,
 423         .release = single_release,
 424 };
 425
 426 int __init ip_misc_proc_init(void)
 427 {
 428         int rc = 0;
 429
 430         if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
 431                 goto out_netstat;
 432
 433         if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
 434                 goto out_snmp;
 435
 436         if (!proc_net_fops_create(&init_net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 437                 goto out_sockstat;
 438 out:
 439         return rc;
 440 out_sockstat:
 441         proc_net_remove(&init_net, "snmp");
 442 out_snmp:
 443         proc_net_remove(&init_net, "netstat");
 444 out_netstat:
 445         rc = -ENOMEM;
 446         goto out;
 447 }
 448