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/bottom_half.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/export.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         int orphans, sockets;
  56
  57         local_bh_disable();
  58         orphans = percpu_counter_sum_positive(&tcp_orphan_count);
  59         sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
  60         local_bh_enable();
  61
  62         socket_seq_show(seq);
  63         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
  64                    sock_prot_inuse_get(net, &tcp_prot), orphans,
  65                    tcp_death_row.tw_count, sockets,
  66                    proto_memory_allocated(&tcp_prot));
  67         seq_printf(seq, "UDP: inuse %d mem %ld\n",
  68                    sock_prot_inuse_get(net, &udp_prot),
  69                    proto_memory_allocated(&udp_prot));
  70         seq_printf(seq, "UDPLITE: inuse %d\n",
  71                    sock_prot_inuse_get(net, &udplite_prot));
  72         seq_printf(seq, "RAW: inuse %d\n",
  73                    sock_prot_inuse_get(net, &raw_prot));
  74         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
  75                         ip_frag_nqueues(net), ip_frag_mem(net));
  76         return 0;
  77 }
  78
  79 static int sockstat_seq_open(struct inode *inode, struct file *file)
  80 {
  81         return single_open_net(inode, file, sockstat_seq_show);
  82 }
  83
  84 static const struct file_operations sockstat_seq_fops = {
  85         .owner   = THIS_MODULE,
  86         .open    = sockstat_seq_open,
  87         .read    = seq_read,
  88         .llseek  = seq_lseek,
  89         .release = single_release_net,
  90 };
  91
  92 /* snmp items */
  93 static const struct snmp_mib snmp4_ipstats_list[] = {
  94         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
  95         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  96         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  97         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  98         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  99         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
 100         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
 101         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
 102         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 103         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 104         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 105         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
 106         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
 107         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
 108         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
 109         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 110         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 111         SNMP_MIB_SENTINEL
 112 };
 113
 114 /* Following RFC4293 items are displayed in /proc/net/netstat */
 115 static const struct snmp_mib snmp4_ipextstats_list[] = {
 116         SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 117         SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 118         SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 119         SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 120         SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 121         SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 122         SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
 123         SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
 124         SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
 125         SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
 126         SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
 127         SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
 128         SNMP_MIB_SENTINEL
 129 };
 130
 131 static const struct {
 132         const char *name;
 133         int index;
 134 } icmpmibmap[] = {
 135         { "DestUnreachs", ICMP_DEST_UNREACH },
 136         { "TimeExcds", ICMP_TIME_EXCEEDED },
 137         { "ParmProbs", ICMP_PARAMETERPROB },
 138         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 139         { "Redirects", ICMP_REDIRECT },
 140         { "Echos", ICMP_ECHO },
 141         { "EchoReps", ICMP_ECHOREPLY },
 142         { "Timestamps", ICMP_TIMESTAMP },
 143         { "TimestampReps", ICMP_TIMESTAMPREPLY },
 144         { "AddrMasks", ICMP_ADDRESS },
 145         { "AddrMaskReps", ICMP_ADDRESSREPLY },
 146         { NULL, 0 }
 147 };
 148
 149
 150 static const struct snmp_mib snmp4_tcp_list[] = {
 151         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 152         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 153         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 154         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 155         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 156         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 157         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 158         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 159         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 160         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 161         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 162         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 163         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 164         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 165         SNMP_MIB_SENTINEL
 166 };
 167
 168 static const struct snmp_mib snmp4_udp_list[] = {
 169         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 170         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 171         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 172         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 173         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 174         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 175         SNMP_MIB_SENTINEL
 176 };
 177
 178 static const struct snmp_mib snmp4_net_list[] = {
 179         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 180         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 181         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 182         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 183         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 184         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 185         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 186         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 187         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 188         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 189         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 190         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 191         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 192         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 193         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 194         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 195         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 196         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 197         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 198         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 199         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 200         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 201         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 202         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 203         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 204         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 205         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 206         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 207         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 208         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 209         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 210         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 211         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 212         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 213         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 214         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 215         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 216         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 217         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 218         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 219         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 220         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 221         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 222         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 223         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 224         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 225         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 226         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 227         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 228         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 229         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 230         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 231         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 232         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 233         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 234         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 235         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 236         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 237         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 238         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 239         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 240         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 241         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 242         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 243         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 244         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 245         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 246         SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
 247         SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
 248         SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
 249         SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
 250         SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
 251         SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
 252         SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
 253         SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
 254         SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
 255         SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
 256         SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
 257         SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
 258         SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
 259         SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
 260         SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
 261         SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
 262         SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
 263         SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
 264         SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
 265         SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
 266         SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
 267         SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
 268         SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
 269         SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
 270         SNMP_MIB_SENTINEL
 271 };
 272
 273 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
 274                              unsigned short *type, int count)
 275 {
 276         int j;
 277
 278         if (count) {
 279                 seq_printf(seq, "\nIcmpMsg:");
 280                 for (j = 0; j < count; ++j)
 281                         seq_printf(seq, " %sType%u",
 282                                 type[j] & 0x100 ? "Out" : "In",
 283                                 type[j] & 0xff);
 284                 seq_printf(seq, "\nIcmpMsg:");
 285                 for (j = 0; j < count; ++j)
 286                         seq_printf(seq, " %lu", vals[j]);
 287         }
 288 }
 289
 290 static void icmpmsg_put(struct seq_file *seq)
 291 {
 292 #define PERLINE 16
 293
 294         int i, count;
 295         unsigned short type[PERLINE];
 296         unsigned long vals[PERLINE], val;
 297         struct net *net = seq->private;
 298
 299         count = 0;
 300         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 301                 val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
 302                 if (val) {
 303                         type[count] = i;
 304                         vals[count++] = val;
 305                 }
 306                 if (count == PERLINE) {
 307                         icmpmsg_put_line(seq, vals, type, count);
 308                         count = 0;
 309                 }
 310         }
 311         icmpmsg_put_line(seq, vals, type, count);
 312
 313 #undef PERLINE
 314 }
 315
 316 static void icmp_put(struct seq_file *seq)
 317 {
 318         int i;
 319         struct net *net = seq->private;
 320         atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
 321
 322         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 323         for (i=0; icmpmibmap[i].name != NULL; i++)
 324                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 325         seq_printf(seq, " OutMsgs OutErrors");
 326         for (i=0; icmpmibmap[i].name != NULL; i++)
 327                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 328         seq_printf(seq, "\nIcmp: %lu %lu",
 329                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
 330                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
 331         for (i=0; icmpmibmap[i].name != NULL; i++)
 332                 seq_printf(seq, " %lu",
 333                            atomic_long_read(ptr + icmpmibmap[i].index));
 334         seq_printf(seq, " %lu %lu",
 335                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
 336                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
 337         for (i=0; icmpmibmap[i].name != NULL; i++)
 338                 seq_printf(seq, " %lu",
 339                            atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
 340 }
 341
 342 /*
 343  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 344  */
 345 static int snmp_seq_show(struct seq_file *seq, void *v)
 346 {
 347         int i;
 348         struct net *net = seq->private;
 349
 350         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 351
 352         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 353                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 354
 355         seq_printf(seq, "\nIp: %d %d",
 356                    IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
 357                    sysctl_ip_default_ttl);
 358
 359         BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
 360         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 361                 seq_printf(seq, " %llu",
 362                            snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
 363                                              snmp4_ipstats_list[i].entry,
 364                                              offsetof(struct ipstats_mib, syncp)));
 365
 366         icmp_put(seq);  /* RFC 2011 compatibility */
 367         icmpmsg_put(seq);
 368
 369         seq_puts(seq, "\nTcp:");
 370         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 371                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 372
 373         seq_puts(seq, "\nTcp:");
 374         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 375                 /* MaxConn field is signed, RFC 2012 */
 376                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 377                         seq_printf(seq, " %ld",
 378                                    snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 379                                                    snmp4_tcp_list[i].entry));
 380                 else
 381                         seq_printf(seq, " %lu",
 382                                    snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 383                                                    snmp4_tcp_list[i].entry));
 384         }
 385
 386         seq_puts(seq, "\nUdp:");
 387         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 388                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 389
 390         seq_puts(seq, "\nUdp:");
 391         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 392                 seq_printf(seq, " %lu",
 393                            snmp_fold_field((void __percpu **)net->mib.udp_statistics,
 394                                            snmp4_udp_list[i].entry));
 395
 396         /* the UDP and UDP-Lite MIBs are the same */
 397         seq_puts(seq, "\nUdpLite:");
 398         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 399                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 400
 401         seq_puts(seq, "\nUdpLite:");
 402         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 403                 seq_printf(seq, " %lu",
 404                            snmp_fold_field((void __percpu **)net->mib.udplite_statistics,
 405                                            snmp4_udp_list[i].entry));
 406
 407         seq_putc(seq, '\n');
 408         return 0;
 409 }
 410
 411 static int snmp_seq_open(struct inode *inode, struct file *file)
 412 {
 413         return single_open_net(inode, file, snmp_seq_show);
 414 }
 415
 416 static const struct file_operations snmp_seq_fops = {
 417         .owner   = THIS_MODULE,
 418         .open    = snmp_seq_open,
 419         .read    = seq_read,
 420         .llseek  = seq_lseek,
 421         .release = single_release_net,
 422 };
 423
 424
 425
 426 /*
 427  *      Output /proc/net/netstat
 428  */
 429 static int netstat_seq_show(struct seq_file *seq, void *v)
 430 {
 431         int i;
 432         struct net *net = seq->private;
 433
 434         seq_puts(seq, "TcpExt:");
 435         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 436                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 437
 438         seq_puts(seq, "\nTcpExt:");
 439         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 440                 seq_printf(seq, " %lu",
 441                            snmp_fold_field((void __percpu **)net->mib.net_statistics,
 442                                            snmp4_net_list[i].entry));
 443
 444         seq_puts(seq, "\nIpExt:");
 445         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 446                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 447
 448         seq_puts(seq, "\nIpExt:");
 449         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 450                 seq_printf(seq, " %llu",
 451                            snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
 452                                              snmp4_ipextstats_list[i].entry,
 453                                              offsetof(struct ipstats_mib, syncp)));
 454
 455         seq_putc(seq, '\n');
 456         return 0;
 457 }
 458
 459 static int netstat_seq_open(struct inode *inode, struct file *file)
 460 {
 461         return single_open_net(inode, file, netstat_seq_show);
 462 }
 463
 464 static const struct file_operations netstat_seq_fops = {
 465         .owner   = THIS_MODULE,
 466         .open    = netstat_seq_open,
 467         .read    = seq_read,
 468         .llseek  = seq_lseek,
 469         .release = single_release_net,
 470 };
 471
 472 static __net_init int ip_proc_init_net(struct net *net)
 473 {
 474         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 475                 goto out_sockstat;
 476         if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
 477                 goto out_netstat;
 478         if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
 479                 goto out_snmp;
 480
 481         return 0;
 482
 483 out_snmp:
 484         proc_net_remove(net, "netstat");
 485 out_netstat:
 486         proc_net_remove(net, "sockstat");
 487 out_sockstat:
 488         return -ENOMEM;
 489 }
 490
 491 static __net_exit void ip_proc_exit_net(struct net *net)
 492 {
 493         proc_net_remove(net, "snmp");
 494         proc_net_remove(net, "netstat");
 495         proc_net_remove(net, "sockstat");
 496 }
 497
 498 static __net_initdata struct pernet_operations ip_proc_ops = {
 499         .init = ip_proc_init_net,
 500         .exit = ip_proc_exit_net,
 501 };
 502
 503 int __init ip_misc_proc_init(void)
 504 {
 505         return register_pernet_subsys(&ip_proc_ops);
 506 }
 507