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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(&init_net, &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",
  61                    sock_prot_inuse_get(&init_net, &udp_prot),
  62                    atomic_read(&udp_memory_allocated));
  63         seq_printf(seq, "UDPLITE: inuse %d\n",
  64                    sock_prot_inuse_get(&init_net, &udplite_prot));
  65         seq_printf(seq, "RAW: inuse %d\n",
  66                    sock_prot_inuse_get(&init_net, &raw_prot));
  67         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
  68                         ip_frag_nqueues(&init_net), ip_frag_mem(&init_net));
  69         return 0;
  70 }
  71
  72 static int sockstat_seq_open(struct inode *inode, struct file *file)
  73 {
  74         return single_open(file, sockstat_seq_show, NULL);
  75 }
  76
  77 static const struct file_operations sockstat_seq_fops = {
  78         .owner   = THIS_MODULE,
  79         .open    = sockstat_seq_open,
  80         .read    = seq_read,
  81         .llseek  = seq_lseek,
  82         .release = single_release,
  83 };
  84
  85 /* snmp items */
  86 static const struct snmp_mib snmp4_ipstats_list[] = {
  87         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
  88         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  89         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  90         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  91         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  92         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
  93         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
  94         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
  95         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
  96         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
  97         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
  98         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
  99         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
 100         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
 101         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
 102         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 103         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 104         SNMP_MIB_SENTINEL
 105 };
 106
 107 /* Following RFC4293 items are displayed in /proc/net/netstat */
 108 static const struct snmp_mib snmp4_ipextstats_list[] = {
 109         SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 110         SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 111         SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 112         SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 113         SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 114         SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 115         SNMP_MIB_SENTINEL
 116 };
 117
 118 static struct {
 119         char *name;
 120         int index;
 121 } icmpmibmap[] = {
 122         { "DestUnreachs", ICMP_DEST_UNREACH },
 123         { "TimeExcds", ICMP_TIME_EXCEEDED },
 124         { "ParmProbs", ICMP_PARAMETERPROB },
 125         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 126         { "Redirects", ICMP_REDIRECT },
 127         { "Echos", ICMP_ECHO },
 128         { "EchoReps", ICMP_ECHOREPLY },
 129         { "Timestamps", ICMP_TIMESTAMP },
 130         { "TimestampReps", ICMP_TIMESTAMPREPLY },
 131         { "AddrMasks", ICMP_ADDRESS },
 132         { "AddrMaskReps", ICMP_ADDRESSREPLY },
 133         { NULL, 0 }
 134 };
 135
 136
 137 static const struct snmp_mib snmp4_tcp_list[] = {
 138         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 139         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 140         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 141         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 142         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 143         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 144         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 145         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 146         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 147         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 148         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 149         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 150         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 151         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 152         SNMP_MIB_SENTINEL
 153 };
 154
 155 static const struct snmp_mib snmp4_udp_list[] = {
 156         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 157         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 158         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 159         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 160         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 161         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 162         SNMP_MIB_SENTINEL
 163 };
 164
 165 static const struct snmp_mib snmp4_net_list[] = {
 166         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 167         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 168         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 169         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 170         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 171         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 172         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 173         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 174         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 175         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 176         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 177         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 178         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 179         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 180         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 181         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 182         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 183         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 184         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 185         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 186         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 187         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 188         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 189         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 190         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 191         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 192         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 193         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 194         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 195         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 196         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 197         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 198         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 199         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 200         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 201         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 202         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 203         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 204         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 205         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 206         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 207         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 208         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 209         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 210         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 211         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 212         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 213         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 214         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 215         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 216         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 217         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 218         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 219         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 220         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 221         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 222         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 223         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 224         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 225         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 226         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 227         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 228         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 229         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 230         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 231         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 232         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 233         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 234         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 235         SNMP_MIB_SENTINEL
 236 };
 237
 238 static void icmpmsg_put(struct seq_file *seq)
 239 {
 240 #define PERLINE 16
 241
 242         int j, i, count;
 243         static int out[PERLINE];
 244
 245         count = 0;
 246         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 247
 248                 if (snmp_fold_field((void **) icmpmsg_statistics, i))
 249                         out[count++] = i;
 250                 if (count < PERLINE)
 251                         continue;
 252
 253                 seq_printf(seq, "\nIcmpMsg:");
 254                 for (j = 0; j < PERLINE; ++j)
 255                         seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
 256                                         i & 0xff);
 257                 seq_printf(seq, "\nIcmpMsg: ");
 258                 for (j = 0; j < PERLINE; ++j)
 259                         seq_printf(seq, " %lu",
 260                                 snmp_fold_field((void **) icmpmsg_statistics,
 261                                 out[j]));
 262                 seq_putc(seq, '\n');
 263         }
 264         if (count) {
 265                 seq_printf(seq, "\nIcmpMsg:");
 266                 for (j = 0; j < count; ++j)
 267                         seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :
 268                                 "In", out[j] & 0xff);
 269                 seq_printf(seq, "\nIcmpMsg:");
 270                 for (j = 0; j < count; ++j)
 271                         seq_printf(seq, " %lu", snmp_fold_field((void **)
 272                                 icmpmsg_statistics, out[j]));
 273         }
 274
 275 #undef PERLINE
 276 }
 277
 278 static void icmp_put(struct seq_file *seq)
 279 {
 280         int i;
 281
 282         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 283         for (i=0; icmpmibmap[i].name != NULL; i++)
 284                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 285         seq_printf(seq, " OutMsgs OutErrors");
 286         for (i=0; icmpmibmap[i].name != NULL; i++)
 287                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 288         seq_printf(seq, "\nIcmp: %lu %lu",
 289                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),
 290                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));
 291         for (i=0; icmpmibmap[i].name != NULL; i++)
 292                 seq_printf(seq, " %lu",
 293                         snmp_fold_field((void **) icmpmsg_statistics,
 294                                 icmpmibmap[i].index));
 295         seq_printf(seq, " %lu %lu",
 296                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),
 297                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));
 298         for (i=0; icmpmibmap[i].name != NULL; i++)
 299                 seq_printf(seq, " %lu",
 300                         snmp_fold_field((void **) icmpmsg_statistics,
 301                                 icmpmibmap[i].index | 0x100));
 302 }
 303
 304 /*
 305  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 306  */
 307 static int snmp_seq_show(struct seq_file *seq, void *v)
 308 {
 309         int i;
 310
 311         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 312
 313         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 314                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 315
 316         seq_printf(seq, "\nIp: %d %d",
 317                    IPV4_DEVCONF_ALL(&init_net, FORWARDING) ? 1 : 2,
 318                    sysctl_ip_default_ttl);
 319
 320         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 321                 seq_printf(seq, " %lu",
 322                            snmp_fold_field((void **)ip_statistics,
 323                                            snmp4_ipstats_list[i].entry));
 324
 325         icmp_put(seq);  /* RFC 2011 compatibility */
 326         icmpmsg_put(seq);
 327
 328         seq_puts(seq, "\nTcp:");
 329         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 330                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 331
 332         seq_puts(seq, "\nTcp:");
 333         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 334                 /* MaxConn field is signed, RFC 2012 */
 335                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 336                         seq_printf(seq, " %ld",
 337                                    snmp_fold_field((void **)tcp_statistics,
 338                                                    snmp4_tcp_list[i].entry));
 339                 else
 340                         seq_printf(seq, " %lu",
 341                                    snmp_fold_field((void **)tcp_statistics,
 342                                                    snmp4_tcp_list[i].entry));
 343         }
 344
 345         seq_puts(seq, "\nUdp:");
 346         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 347                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 348
 349         seq_puts(seq, "\nUdp:");
 350         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 351                 seq_printf(seq, " %lu",
 352                            snmp_fold_field((void **)udp_statistics,
 353                                            snmp4_udp_list[i].entry));
 354
 355         /* the UDP and UDP-Lite MIBs are the same */
 356         seq_puts(seq, "\nUdpLite:");
 357         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 358                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 359
 360         seq_puts(seq, "\nUdpLite:");
 361         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 362                 seq_printf(seq, " %lu",
 363                            snmp_fold_field((void **)udplite_statistics,
 364                                            snmp4_udp_list[i].entry));
 365
 366         seq_putc(seq, '\n');
 367         return 0;
 368 }
 369
 370 static int snmp_seq_open(struct inode *inode, struct file *file)
 371 {
 372         return single_open(file, snmp_seq_show, NULL);
 373 }
 374
 375 static const struct file_operations snmp_seq_fops = {
 376         .owner   = THIS_MODULE,
 377         .open    = snmp_seq_open,
 378         .read    = seq_read,
 379         .llseek  = seq_lseek,
 380         .release = single_release,
 381 };
 382
 383
 384
 385 /*
 386  *      Output /proc/net/netstat
 387  */
 388 static int netstat_seq_show(struct seq_file *seq, void *v)
 389 {
 390         int i;
 391
 392         seq_puts(seq, "TcpExt:");
 393         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 394                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 395
 396         seq_puts(seq, "\nTcpExt:");
 397         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 398                 seq_printf(seq, " %lu",
 399                            snmp_fold_field((void **)net_statistics,
 400                                            snmp4_net_list[i].entry));
 401
 402         seq_puts(seq, "\nIpExt:");
 403         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 404                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 405
 406         seq_puts(seq, "\nIpExt:");
 407         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 408                 seq_printf(seq, " %lu",
 409                            snmp_fold_field((void **)ip_statistics,
 410                                            snmp4_ipextstats_list[i].entry));
 411
 412         seq_putc(seq, '\n');
 413         return 0;
 414 }
 415
 416 static int netstat_seq_open(struct inode *inode, struct file *file)
 417 {
 418         return single_open(file, netstat_seq_show, NULL);
 419 }
 420
 421 static const struct file_operations netstat_seq_fops = {
 422         .owner   = THIS_MODULE,
 423         .open    = netstat_seq_open,
 424         .read    = seq_read,
 425         .llseek  = seq_lseek,
 426         .release = single_release,
 427 };
 428
 429 static __net_init int ip_proc_init_net(struct net *net)
 430 {
 431         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 432                 return -ENOMEM;
 433         return 0;
 434 }
 435
 436 static __net_exit void ip_proc_exit_net(struct net *net)
 437 {
 438         proc_net_remove(net, "sockstat");
 439 }
 440
 441 static __net_initdata struct pernet_operations ip_proc_ops = {
 442         .init = ip_proc_init_net,
 443         .exit = ip_proc_exit_net,
 444 };
 445
 446 int __init ip_misc_proc_init(void)
 447 {
 448         int rc = 0;
 449
 450         if (register_pernet_subsys(&ip_proc_ops))
 451                 goto out_pernet;
 452
 453         if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
 454                 goto out_netstat;
 455
 456         if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
 457                 goto out_snmp;
 458 out:
 459         return rc;
 460 out_snmp:
 461         proc_net_remove(&init_net, "netstat");
 462 out_netstat:
 463         unregister_pernet_subsys(&ip_proc_ops);
 464 out_pernet:
 465         rc = -ENOMEM;
 466         goto out;
 467 }
 468