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  * Authors:     Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11  *              Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
  12  *              Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
  13  *              Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
  14  *
  15  * Fixes:
  16  *              Alan Cox        :       UDP sockets show the rxqueue/txqueue
  17  *                                      using hint flag for the netinfo.
  18  *      Pauline Middelink       :       identd support
  19  *              Alan Cox        :       Make /proc safer.
  20  *      Erik Schoenfelder       :       /proc/net/snmp
  21  *              Alan Cox        :       Handle dead sockets properly.
  22  *      Gerhard Koerting        :       Show both timers
  23  *              Alan Cox        :       Allow inode to be NULL (kernel socket)
  24  *      Andi Kleen              :       Add support for open_requests and
  25  *                                      split functions for more readibility.
  26  *      Andi Kleen              :       Add support for /proc/net/netstat
  27  *      Arnaldo C. Melo         :       Convert to seq_file
  28  *
  29  *              This program is free software; you can redistribute it and/or
  30  *              modify it under the terms of the GNU General Public License
  31  *              as published by the Free Software Foundation; either version
  32  *              2 of the License, or (at your option) any later version.
  33  */
  34 #include <linux/types.h>
  35 #include <net/net_namespace.h>
  36 #include <net/icmp.h>
  37 #include <net/protocol.h>
  38 #include <net/tcp.h>
  39 #include <net/udp.h>
  40 #include <net/udplite.h>
  41 #include <linux/inetdevice.h>
  42 #include <linux/proc_fs.h>
  43 #include <linux/seq_file.h>
  44 #include <net/sock.h>
  45 #include <net/raw.h>
  46
  47 /*
  48  *      Report socket allocation statistics [mea@utu.fi]
  49  */
  50 static int sockstat_seq_show(struct seq_file *seq, void *v)
  51 {
  52         struct net *net = seq->private;
  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(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(net, &udp_prot),
  62                    atomic_read(&udp_memory_allocated));
  63         seq_printf(seq, "UDPLITE: inuse %d\n",
  64                    sock_prot_inuse_get(net, &udplite_prot));
  65         seq_printf(seq, "RAW: inuse %d\n",
  66                    sock_prot_inuse_get(net, &raw_prot));
  67         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
  68                         ip_frag_nqueues(net), ip_frag_mem(net));
  69         return 0;
  70 }
  71
  72 static int sockstat_seq_open(struct inode *inode, struct file *file)
  73 {
  74         return single_open_net(inode, file, sockstat_seq_show);
  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_net,
  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_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
 236         SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
 237         SNMP_MIB_SENTINEL
 238 };
 239
 240 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
 241                              unsigned short *type, int count)
 242 {
 243         int j;
 244
 245         if (count) {
 246                 seq_printf(seq, "\nIcmpMsg:");
 247                 for (j = 0; j < count; ++j)
 248                         seq_printf(seq, " %sType%u",
 249                                 type[j] & 0x100 ? "Out" : "In",
 250                                 type[j] & 0xff);
 251                 seq_printf(seq, "\nIcmpMsg:");
 252                 for (j = 0; j < count; ++j)
 253                         seq_printf(seq, " %lu", vals[j]);
 254         }
 255 }
 256
 257 static void icmpmsg_put(struct seq_file *seq)
 258 {
 259 #define PERLINE 16
 260
 261         int i, count;
 262         unsigned short type[PERLINE];
 263         unsigned long vals[PERLINE], val;
 264         struct net *net = seq->private;
 265
 266         count = 0;
 267         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 268                 val = snmp_fold_field((void **) net->mib.icmpmsg_statistics, i);
 269                 if (val) {
 270                         type[count] = i;
 271                         vals[count++] = val;
 272                 }
 273                 if (count == PERLINE) {
 274                         icmpmsg_put_line(seq, vals, type, count);
 275                         count = 0;
 276                 }
 277         }
 278         icmpmsg_put_line(seq, vals, type, count);
 279
 280 #undef PERLINE
 281 }
 282
 283 static void icmp_put(struct seq_file *seq)
 284 {
 285         int i;
 286         struct net *net = seq->private;
 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 **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
 296                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
 297         for (i=0; icmpmibmap[i].name != NULL; i++)
 298                 seq_printf(seq, " %lu",
 299                         snmp_fold_field((void **) net->mib.icmpmsg_statistics,
 300                                 icmpmibmap[i].index));
 301         seq_printf(seq, " %lu %lu",
 302                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
 303                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
 304         for (i=0; icmpmibmap[i].name != NULL; i++)
 305                 seq_printf(seq, " %lu",
 306                         snmp_fold_field((void **) net->mib.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         struct net *net = seq->private;
 317
 318         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 319
 320         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 321                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 322
 323         seq_printf(seq, "\nIp: %d %d",
 324                    IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
 325                    sysctl_ip_default_ttl);
 326
 327         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 328                 seq_printf(seq, " %lu",
 329                            snmp_fold_field((void **)net->mib.ip_statistics,
 330                                            snmp4_ipstats_list[i].entry));
 331
 332         icmp_put(seq);  /* RFC 2011 compatibility */
 333         icmpmsg_put(seq);
 334
 335         seq_puts(seq, "\nTcp:");
 336         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 337                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 338
 339         seq_puts(seq, "\nTcp:");
 340         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 341                 /* MaxConn field is signed, RFC 2012 */
 342                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 343                         seq_printf(seq, " %ld",
 344                                    snmp_fold_field((void **)net->mib.tcp_statistics,
 345                                                    snmp4_tcp_list[i].entry));
 346                 else
 347                         seq_printf(seq, " %lu",
 348                                    snmp_fold_field((void **)net->mib.tcp_statistics,
 349                                                    snmp4_tcp_list[i].entry));
 350         }
 351
 352         seq_puts(seq, "\nUdp:");
 353         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 354                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 355
 356         seq_puts(seq, "\nUdp:");
 357         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 358                 seq_printf(seq, " %lu",
 359                            snmp_fold_field((void **)net->mib.udp_statistics,
 360                                            snmp4_udp_list[i].entry));
 361
 362         /* the UDP and UDP-Lite MIBs are the same */
 363         seq_puts(seq, "\nUdpLite:");
 364         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 365                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 366
 367         seq_puts(seq, "\nUdpLite:");
 368         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 369                 seq_printf(seq, " %lu",
 370                            snmp_fold_field((void **)net->mib.udplite_statistics,
 371                                            snmp4_udp_list[i].entry));
 372
 373         seq_putc(seq, '\n');
 374         return 0;
 375 }
 376
 377 static int snmp_seq_open(struct inode *inode, struct file *file)
 378 {
 379         return single_open_net(inode, file, snmp_seq_show);
 380 }
 381
 382 static const struct file_operations snmp_seq_fops = {
 383         .owner   = THIS_MODULE,
 384         .open    = snmp_seq_open,
 385         .read    = seq_read,
 386         .llseek  = seq_lseek,
 387         .release = single_release_net,
 388 };
 389
 390
 391
 392 /*
 393  *      Output /proc/net/netstat
 394  */
 395 static int netstat_seq_show(struct seq_file *seq, void *v)
 396 {
 397         int i;
 398         struct net *net = seq->private;
 399
 400         seq_puts(seq, "TcpExt:");
 401         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 402                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 403
 404         seq_puts(seq, "\nTcpExt:");
 405         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 406                 seq_printf(seq, " %lu",
 407                            snmp_fold_field((void **)net->mib.net_statistics,
 408                                            snmp4_net_list[i].entry));
 409
 410         seq_puts(seq, "\nIpExt:");
 411         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 412                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 413
 414         seq_puts(seq, "\nIpExt:");
 415         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 416                 seq_printf(seq, " %lu",
 417                            snmp_fold_field((void **)net->mib.ip_statistics,
 418                                            snmp4_ipextstats_list[i].entry));
 419
 420         seq_putc(seq, '\n');
 421         return 0;
 422 }
 423
 424 static int netstat_seq_open(struct inode *inode, struct file *file)
 425 {
 426         return single_open_net(inode, file, netstat_seq_show);
 427 }
 428
 429 static const struct file_operations netstat_seq_fops = {
 430         .owner   = THIS_MODULE,
 431         .open    = netstat_seq_open,
 432         .read    = seq_read,
 433         .llseek  = seq_lseek,
 434         .release = single_release_net,
 435 };
 436
 437 static __net_init int ip_proc_init_net(struct net *net)
 438 {
 439         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 440                 goto out_sockstat;
 441         if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
 442                 goto out_netstat;
 443         if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
 444                 goto out_snmp;
 445
 446         return 0;
 447
 448 out_snmp:
 449         proc_net_remove(net, "netstat");
 450 out_netstat:
 451         proc_net_remove(net, "sockstat");
 452 out_sockstat:
 453         return -ENOMEM;
 454 }
 455
 456 static __net_exit void ip_proc_exit_net(struct net *net)
 457 {
 458         proc_net_remove(net, "snmp");
 459         proc_net_remove(net, "netstat");
 460         proc_net_remove(net, "sockstat");
 461 }
 462
 463 static __net_initdata struct pernet_operations ip_proc_ops = {
 464         .init = ip_proc_init_net,
 465         .exit = ip_proc_exit_net,
 466 };
 467
 468 int __init ip_misc_proc_init(void)
 469 {
 470         return register_pernet_subsys(&ip_proc_ops);
 471 }
 472