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         struct net *net = seq->private;
  55
  56         socket_seq_show(seq);
  57         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
  58                    sock_prot_inuse_get(net, &tcp_prot),
  59                    atomic_read(&tcp_orphan_count),
  60                    tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
  61                    atomic_read(&tcp_memory_allocated));
  62         seq_printf(seq, "UDP: inuse %d mem %d\n",
  63                    sock_prot_inuse_get(net, &udp_prot),
  64                    atomic_read(&udp_memory_allocated));
  65         seq_printf(seq, "UDPLITE: inuse %d\n",
  66                    sock_prot_inuse_get(net, &udplite_prot));
  67         seq_printf(seq, "RAW: inuse %d\n",
  68                    sock_prot_inuse_get(net, &raw_prot));
  69         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
  70                         ip_frag_nqueues(net), ip_frag_mem(net));
  71         return 0;
  72 }
  73
  74 static int sockstat_seq_open(struct inode *inode, struct file *file)
  75 {
  76         int err;
  77         struct net *net;
  78
  79         err = -ENXIO;
  80         net = get_proc_net(inode);
  81         if (net == NULL)
  82                 goto err_net;
  83
  84         err = single_open(file, sockstat_seq_show, net);
  85         if (err < 0)
  86                 goto err_open;
  87
  88         return 0;
  89
  90 err_open:
  91         put_net(net);
  92 err_net:
  93         return err;
  94 }
  95
  96 static int sockstat_seq_release(struct inode *inode, struct file *file)
  97 {
  98         struct net *net = ((struct seq_file *)file->private_data)->private;
  99
 100         put_net(net);
 101         return single_release(inode, file);
 102 }
 103
 104 static const struct file_operations sockstat_seq_fops = {
 105         .owner   = THIS_MODULE,
 106         .open    = sockstat_seq_open,
 107         .read    = seq_read,
 108         .llseek  = seq_lseek,
 109         .release = sockstat_seq_release,
 110 };
 111
 112 /* snmp items */
 113 static const struct snmp_mib snmp4_ipstats_list[] = {
 114         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
 115         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
 116         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
 117         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
 118         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
 119         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
 120         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
 121         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
 122         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 123         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 124         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 125         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
 126         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
 127         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
 128         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
 129         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 130         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 131         SNMP_MIB_SENTINEL
 132 };
 133
 134 /* Following RFC4293 items are displayed in /proc/net/netstat */
 135 static const struct snmp_mib snmp4_ipextstats_list[] = {
 136         SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 137         SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 138         SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 139         SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 140         SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 141         SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 142         SNMP_MIB_SENTINEL
 143 };
 144
 145 static struct {
 146         char *name;
 147         int index;
 148 } icmpmibmap[] = {
 149         { "DestUnreachs", ICMP_DEST_UNREACH },
 150         { "TimeExcds", ICMP_TIME_EXCEEDED },
 151         { "ParmProbs", ICMP_PARAMETERPROB },
 152         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 153         { "Redirects", ICMP_REDIRECT },
 154         { "Echos", ICMP_ECHO },
 155         { "EchoReps", ICMP_ECHOREPLY },
 156         { "Timestamps", ICMP_TIMESTAMP },
 157         { "TimestampReps", ICMP_TIMESTAMPREPLY },
 158         { "AddrMasks", ICMP_ADDRESS },
 159         { "AddrMaskReps", ICMP_ADDRESSREPLY },
 160         { NULL, 0 }
 161 };
 162
 163
 164 static const struct snmp_mib snmp4_tcp_list[] = {
 165         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 166         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 167         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 168         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 169         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 170         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 171         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 172         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 173         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 174         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 175         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 176         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 177         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 178         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 179         SNMP_MIB_SENTINEL
 180 };
 181
 182 static const struct snmp_mib snmp4_udp_list[] = {
 183         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 184         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 185         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 186         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 187         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 188         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 189         SNMP_MIB_SENTINEL
 190 };
 191
 192 static const struct snmp_mib snmp4_net_list[] = {
 193         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 194         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 195         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 196         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 197         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 198         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 199         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 200         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 201         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 202         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 203         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 204         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 205         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 206         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 207         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 208         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 209         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 210         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 211         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 212         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 213         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 214         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 215         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 216         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 217         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 218         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 219         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 220         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 221         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 222         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 223         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 224         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 225         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 226         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 227         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 228         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 229         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 230         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 231         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 232         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 233         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 234         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 235         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 236         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 237         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 238         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 239         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 240         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 241         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 242         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 243         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 244         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 245         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 246         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 247         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 248         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 249         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 250         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 251         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 252         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 253         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 254         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 255         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 256         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 257         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 258         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 259         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 260         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 261         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 262         SNMP_MIB_SENTINEL
 263 };
 264
 265 static void icmpmsg_put(struct seq_file *seq)
 266 {
 267 #define PERLINE 16
 268
 269         int j, i, count;
 270         static int out[PERLINE];
 271
 272         count = 0;
 273         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 274
 275                 if (snmp_fold_field((void **) icmpmsg_statistics, i))
 276                         out[count++] = i;
 277                 if (count < PERLINE)
 278                         continue;
 279
 280                 seq_printf(seq, "\nIcmpMsg:");
 281                 for (j = 0; j < PERLINE; ++j)
 282                         seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
 283                                         i & 0xff);
 284                 seq_printf(seq, "\nIcmpMsg: ");
 285                 for (j = 0; j < PERLINE; ++j)
 286                         seq_printf(seq, " %lu",
 287                                 snmp_fold_field((void **) icmpmsg_statistics,
 288                                 out[j]));
 289                 seq_putc(seq, '\n');
 290         }
 291         if (count) {
 292                 seq_printf(seq, "\nIcmpMsg:");
 293                 for (j = 0; j < count; ++j)
 294                         seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :
 295                                 "In", out[j] & 0xff);
 296                 seq_printf(seq, "\nIcmpMsg:");
 297                 for (j = 0; j < count; ++j)
 298                         seq_printf(seq, " %lu", snmp_fold_field((void **)
 299                                 icmpmsg_statistics, out[j]));
 300         }
 301
 302 #undef PERLINE
 303 }
 304
 305 static void icmp_put(struct seq_file *seq)
 306 {
 307         int i;
 308
 309         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 310         for (i=0; icmpmibmap[i].name != NULL; i++)
 311                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 312         seq_printf(seq, " OutMsgs OutErrors");
 313         for (i=0; icmpmibmap[i].name != NULL; i++)
 314                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 315         seq_printf(seq, "\nIcmp: %lu %lu",
 316                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),
 317                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));
 318         for (i=0; icmpmibmap[i].name != NULL; i++)
 319                 seq_printf(seq, " %lu",
 320                         snmp_fold_field((void **) icmpmsg_statistics,
 321                                 icmpmibmap[i].index));
 322         seq_printf(seq, " %lu %lu",
 323                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),
 324                 snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));
 325         for (i=0; icmpmibmap[i].name != NULL; i++)
 326                 seq_printf(seq, " %lu",
 327                         snmp_fold_field((void **) icmpmsg_statistics,
 328                                 icmpmibmap[i].index | 0x100));
 329 }
 330
 331 /*
 332  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 333  */
 334 static int snmp_seq_show(struct seq_file *seq, void *v)
 335 {
 336         int i;
 337
 338         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 339
 340         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 341                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 342
 343         seq_printf(seq, "\nIp: %d %d",
 344                    IPV4_DEVCONF_ALL(&init_net, FORWARDING) ? 1 : 2,
 345                    sysctl_ip_default_ttl);
 346
 347         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 348                 seq_printf(seq, " %lu",
 349                            snmp_fold_field((void **)ip_statistics,
 350                                            snmp4_ipstats_list[i].entry));
 351
 352         icmp_put(seq);  /* RFC 2011 compatibility */
 353         icmpmsg_put(seq);
 354
 355         seq_puts(seq, "\nTcp:");
 356         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 357                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 358
 359         seq_puts(seq, "\nTcp:");
 360         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 361                 /* MaxConn field is signed, RFC 2012 */
 362                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 363                         seq_printf(seq, " %ld",
 364                                    snmp_fold_field((void **)tcp_statistics,
 365                                                    snmp4_tcp_list[i].entry));
 366                 else
 367                         seq_printf(seq, " %lu",
 368                                    snmp_fold_field((void **)tcp_statistics,
 369                                                    snmp4_tcp_list[i].entry));
 370         }
 371
 372         seq_puts(seq, "\nUdp:");
 373         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 374                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 375
 376         seq_puts(seq, "\nUdp:");
 377         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 378                 seq_printf(seq, " %lu",
 379                            snmp_fold_field((void **)udp_statistics,
 380                                            snmp4_udp_list[i].entry));
 381
 382         /* the UDP and UDP-Lite MIBs are the same */
 383         seq_puts(seq, "\nUdpLite:");
 384         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 385                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 386
 387         seq_puts(seq, "\nUdpLite:");
 388         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 389                 seq_printf(seq, " %lu",
 390                            snmp_fold_field((void **)udplite_statistics,
 391                                            snmp4_udp_list[i].entry));
 392
 393         seq_putc(seq, '\n');
 394         return 0;
 395 }
 396
 397 static int snmp_seq_open(struct inode *inode, struct file *file)
 398 {
 399         return single_open(file, snmp_seq_show, NULL);
 400 }
 401
 402 static const struct file_operations snmp_seq_fops = {
 403         .owner   = THIS_MODULE,
 404         .open    = snmp_seq_open,
 405         .read    = seq_read,
 406         .llseek  = seq_lseek,
 407         .release = single_release,
 408 };
 409
 410
 411
 412 /*
 413  *      Output /proc/net/netstat
 414  */
 415 static int netstat_seq_show(struct seq_file *seq, void *v)
 416 {
 417         int i;
 418
 419         seq_puts(seq, "TcpExt:");
 420         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 421                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 422
 423         seq_puts(seq, "\nTcpExt:");
 424         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 425                 seq_printf(seq, " %lu",
 426                            snmp_fold_field((void **)net_statistics,
 427                                            snmp4_net_list[i].entry));
 428
 429         seq_puts(seq, "\nIpExt:");
 430         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 431                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 432
 433         seq_puts(seq, "\nIpExt:");
 434         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 435                 seq_printf(seq, " %lu",
 436                            snmp_fold_field((void **)ip_statistics,
 437                                            snmp4_ipextstats_list[i].entry));
 438
 439         seq_putc(seq, '\n');
 440         return 0;
 441 }
 442
 443 static int netstat_seq_open(struct inode *inode, struct file *file)
 444 {
 445         return single_open(file, netstat_seq_show, NULL);
 446 }
 447
 448 static const struct file_operations netstat_seq_fops = {
 449         .owner   = THIS_MODULE,
 450         .open    = netstat_seq_open,
 451         .read    = seq_read,
 452         .llseek  = seq_lseek,
 453         .release = single_release,
 454 };
 455
 456 static __net_init int ip_proc_init_net(struct net *net)
 457 {
 458         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 459                 return -ENOMEM;
 460         return 0;
 461 }
 462
 463 static __net_exit void ip_proc_exit_net(struct net *net)
 464 {
 465         proc_net_remove(net, "sockstat");
 466 }
 467
 468 static __net_initdata struct pernet_operations ip_proc_ops = {
 469         .init = ip_proc_init_net,
 470         .exit = ip_proc_exit_net,
 471 };
 472
 473 int __init ip_misc_proc_init(void)
 474 {
 475         int rc = 0;
 476
 477         if (register_pernet_subsys(&ip_proc_ops))
 478                 goto out_pernet;
 479
 480         if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
 481                 goto out_netstat;
 482
 483         if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
 484                 goto out_snmp;
 485 out:
 486         return rc;
 487 out_snmp:
 488         proc_net_remove(&init_net, "netstat");
 489 out_netstat:
 490         unregister_pernet_subsys(&ip_proc_ops);
 491 out_pernet:
 492         rc = -ENOMEM;
 493         goto out;
 494 }
 495