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         int err;
  75         struct net *net;
  76
  77         err = -ENXIO;
  78         net = get_proc_net(inode);
  79         if (net == NULL)
  80                 goto err_net;
  81
  82         err = single_open(file, sockstat_seq_show, net);
  83         if (err < 0)
  84                 goto err_open;
  85
  86         return 0;
  87
  88 err_open:
  89         put_net(net);
  90 err_net:
  91         return err;
  92 }
  93
  94 static int sockstat_seq_release(struct inode *inode, struct file *file)
  95 {
  96         struct net *net = ((struct seq_file *)file->private_data)->private;
  97
  98         put_net(net);
  99         return single_release(inode, file);
 100 }
 101
 102 static const struct file_operations sockstat_seq_fops = {
 103         .owner   = THIS_MODULE,
 104         .open    = sockstat_seq_open,
 105         .read    = seq_read,
 106         .llseek  = seq_lseek,
 107         .release = sockstat_seq_release,
 108 };
 109
 110 /* snmp items */
 111 static const struct snmp_mib snmp4_ipstats_list[] = {
 112         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
 113         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
 114         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
 115         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
 116         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
 117         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
 118         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
 119         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
 120         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 121         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 122         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 123         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
 124         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
 125         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
 126         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
 127         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 128         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 129         SNMP_MIB_SENTINEL
 130 };
 131
 132 /* Following RFC4293 items are displayed in /proc/net/netstat */
 133 static const struct snmp_mib snmp4_ipextstats_list[] = {
 134         SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 135         SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 136         SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 137         SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 138         SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 139         SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 140         SNMP_MIB_SENTINEL
 141 };
 142
 143 static struct {
 144         char *name;
 145         int index;
 146 } icmpmibmap[] = {
 147         { "DestUnreachs", ICMP_DEST_UNREACH },
 148         { "TimeExcds", ICMP_TIME_EXCEEDED },
 149         { "ParmProbs", ICMP_PARAMETERPROB },
 150         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 151         { "Redirects", ICMP_REDIRECT },
 152         { "Echos", ICMP_ECHO },
 153         { "EchoReps", ICMP_ECHOREPLY },
 154         { "Timestamps", ICMP_TIMESTAMP },
 155         { "TimestampReps", ICMP_TIMESTAMPREPLY },
 156         { "AddrMasks", ICMP_ADDRESS },
 157         { "AddrMaskReps", ICMP_ADDRESSREPLY },
 158         { NULL, 0 }
 159 };
 160
 161
 162 static const struct snmp_mib snmp4_tcp_list[] = {
 163         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 164         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 165         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 166         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 167         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 168         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 169         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 170         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 171         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 172         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 173         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 174         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 175         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 176         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 177         SNMP_MIB_SENTINEL
 178 };
 179
 180 static const struct snmp_mib snmp4_udp_list[] = {
 181         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 182         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 183         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 184         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 185         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 186         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 187         SNMP_MIB_SENTINEL
 188 };
 189
 190 static const struct snmp_mib snmp4_net_list[] = {
 191         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 192         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 193         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 194         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 195         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 196         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 197         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 198         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 199         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 200         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 201         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 202         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 203         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 204         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 205         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 206         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 207         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 208         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 209         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 210         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 211         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 212         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 213         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 214         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 215         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 216         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 217         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 218         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 219         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 220         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 221         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 222         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 223         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 224         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 225         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 226         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 227         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 228         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 229         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 230         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 231         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 232         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 233         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 234         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 235         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 236         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 237         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 238         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 239         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 240         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 241         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 242         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 243         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 244         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 245         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 246         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 247         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 248         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 249         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 250         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 251         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 252         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 253         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 254         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 255         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 256         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 257         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 258         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 259         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 260         SNMP_MIB_SENTINEL
 261 };
 262
 263 static void icmpmsg_put(struct seq_file *seq)
 264 {
 265 #define PERLINE 16
 266
 267         int j, i, count;
 268         static int out[PERLINE];
 269
 270         count = 0;
 271         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 272
 273                 if (snmp_fold_field((void **) icmpmsg_statistics, i))
 274                         out[count++] = i;
 275                 if (count < PERLINE)
 276                         continue;
 277
 278                 seq_printf(seq, "\nIcmpMsg:");
 279                 for (j = 0; j < PERLINE; ++j)
 280                         seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
 281                                         i & 0xff);
 282                 seq_printf(seq, "\nIcmpMsg: ");
 283                 for (j = 0; j < PERLINE; ++j)
 284                         seq_printf(seq, " %lu",
 285                                 snmp_fold_field((void **) icmpmsg_statistics,
 286                                 out[j]));
 287                 seq_putc(seq, '\n');
 288         }
 289         if (count) {
 290                 seq_printf(seq, "\nIcmpMsg:");
 291                 for (j = 0; j < count; ++j)
 292                         seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :
 293                                 "In", out[j] & 0xff);
 294                 seq_printf(seq, "\nIcmpMsg:");
 295                 for (j = 0; j < count; ++j)
 296                         seq_printf(seq, " %lu", snmp_fold_field((void **)
 297                                 icmpmsg_statistics, out[j]));
 298         }
 299
 300 #undef PERLINE
 301 }
 302
 303 static void icmp_put(struct seq_file *seq)
 304 {
 305         int i;
 306
 307         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 308         for (i=0; icmpmibmap[i].name != NULL; i++)
 309                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 310         seq_printf(seq, " OutMsgs OutErrors");
 311         for (i=0; icmpmibmap[i].name != NULL; i++)
 312                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 313         seq_printf(seq, "\nIcmp: %lu %lu",
 314                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),
 315                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));
 316         for (i=0; icmpmibmap[i].name != NULL; i++)
 317                 seq_printf(seq, " %lu",
 318                         snmp_fold_field((void **) icmpmsg_statistics,
 319                                 icmpmibmap[i].index));
 320         seq_printf(seq, " %lu %lu",
 321                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),
 322                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));
 323         for (i=0; icmpmibmap[i].name != NULL; i++)
 324                 seq_printf(seq, " %lu",
 325                         snmp_fold_field((void **) icmpmsg_statistics,
 326                                 icmpmibmap[i].index | 0x100));
 327 }
 328
 329 /*
 330  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 331  */
 332 static int snmp_seq_show(struct seq_file *seq, void *v)
 333 {
 334         int i;
 335
 336         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 337
 338         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 339                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 340
 341         seq_printf(seq, "\nIp: %d %d",
 342                    IPV4_DEVCONF_ALL(&init_net, FORWARDING) ? 1 : 2,
 343                    sysctl_ip_default_ttl);
 344
 345         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 346                 seq_printf(seq, " %lu",
 347                            snmp_fold_field((void **)ip_statistics,
 348                                            snmp4_ipstats_list[i].entry));
 349
 350         icmp_put(seq);  /* RFC 2011 compatibility */
 351         icmpmsg_put(seq);
 352
 353         seq_puts(seq, "\nTcp:");
 354         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 355                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 356
 357         seq_puts(seq, "\nTcp:");
 358         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 359                 /* MaxConn field is signed, RFC 2012 */
 360                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 361                         seq_printf(seq, " %ld",
 362                                    snmp_fold_field((void **)tcp_statistics,
 363                                                    snmp4_tcp_list[i].entry));
 364                 else
 365                         seq_printf(seq, " %lu",
 366                                    snmp_fold_field((void **)tcp_statistics,
 367                                                    snmp4_tcp_list[i].entry));
 368         }
 369
 370         seq_puts(seq, "\nUdp:");
 371         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 372                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 373
 374         seq_puts(seq, "\nUdp:");
 375         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 376                 seq_printf(seq, " %lu",
 377                            snmp_fold_field((void **)udp_statistics,
 378                                            snmp4_udp_list[i].entry));
 379
 380         /* the UDP and UDP-Lite MIBs are the same */
 381         seq_puts(seq, "\nUdpLite:");
 382         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 383                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 384
 385         seq_puts(seq, "\nUdpLite:");
 386         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 387                 seq_printf(seq, " %lu",
 388                            snmp_fold_field((void **)udplite_statistics,
 389                                            snmp4_udp_list[i].entry));
 390
 391         seq_putc(seq, '\n');
 392         return 0;
 393 }
 394
 395 static int snmp_seq_open(struct inode *inode, struct file *file)
 396 {
 397         return single_open(file, snmp_seq_show, NULL);
 398 }
 399
 400 static const struct file_operations snmp_seq_fops = {
 401         .owner   = THIS_MODULE,
 402         .open    = snmp_seq_open,
 403         .read    = seq_read,
 404         .llseek  = seq_lseek,
 405         .release = single_release,
 406 };
 407
 408
 409
 410 /*
 411  *      Output /proc/net/netstat
 412  */
 413 static int netstat_seq_show(struct seq_file *seq, void *v)
 414 {
 415         int i;
 416
 417         seq_puts(seq, "TcpExt:");
 418         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 419                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 420
 421         seq_puts(seq, "\nTcpExt:");
 422         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 423                 seq_printf(seq, " %lu",
 424                            snmp_fold_field((void **)net_statistics,
 425                                            snmp4_net_list[i].entry));
 426
 427         seq_puts(seq, "\nIpExt:");
 428         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 429                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 430
 431         seq_puts(seq, "\nIpExt:");
 432         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 433                 seq_printf(seq, " %lu",
 434                            snmp_fold_field((void **)ip_statistics,
 435                                            snmp4_ipextstats_list[i].entry));
 436
 437         seq_putc(seq, '\n');
 438         return 0;
 439 }
 440
 441 static int netstat_seq_open(struct inode *inode, struct file *file)
 442 {
 443         return single_open(file, netstat_seq_show, NULL);
 444 }
 445
 446 static const struct file_operations netstat_seq_fops = {
 447         .owner   = THIS_MODULE,
 448         .open    = netstat_seq_open,
 449         .read    = seq_read,
 450         .llseek  = seq_lseek,
 451         .release = single_release,
 452 };
 453
 454 static __net_init int ip_proc_init_net(struct net *net)
 455 {
 456         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 457                 return -ENOMEM;
 458         return 0;
 459 }
 460
 461 static __net_exit void ip_proc_exit_net(struct net *net)
 462 {
 463         proc_net_remove(net, "sockstat");
 464 }
 465
 466 static __net_initdata struct pernet_operations ip_proc_ops = {
 467         .init = ip_proc_init_net,
 468         .exit = ip_proc_exit_net,
 469 };
 470
 471 int __init ip_misc_proc_init(void)
 472 {
 473         int rc = 0;
 474
 475         if (register_pernet_subsys(&ip_proc_ops))
 476                 goto out_pernet;
 477
 478         if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
 479                 goto out_netstat;
 480
 481         if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
 482                 goto out_snmp;
 483 out:
 484         return rc;
 485 out_snmp:
 486         proc_net_remove(&init_net, "netstat");
 487 out_netstat:
 488         unregister_pernet_subsys(&ip_proc_ops);
 489 out_pernet:
 490         rc = -ENOMEM;
 491         goto out;
 492 }
 493