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