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("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 236         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 237         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 238         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 239         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 240         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 241         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 242         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 243         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 244         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 245         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 246         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 247         SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
 248         SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
 249         SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
 250         SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
 251         SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
 252         SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
 253         SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
 254         SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
 255         SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
 256         SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
 257         SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
 258         SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
 259         SNMP_MIB_SENTINEL
 260 };
 261
 262 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
 263                              unsigned short *type, int count)
 264 {
 265         int j;
 266
 267         if (count) {
 268                 seq_printf(seq, "\nIcmpMsg:");
 269                 for (j = 0; j < count; ++j)
 270                         seq_printf(seq, " %sType%u",
 271                                 type[j] & 0x100 ? "Out" : "In",
 272                                 type[j] & 0xff);
 273                 seq_printf(seq, "\nIcmpMsg:");
 274                 for (j = 0; j < count; ++j)
 275                         seq_printf(seq, " %lu", vals[j]);
 276         }
 277 }
 278
 279 static void icmpmsg_put(struct seq_file *seq)
 280 {
 281 #define PERLINE 16
 282
 283         int i, count;
 284         unsigned short type[PERLINE];
 285         unsigned long vals[PERLINE], val;
 286         struct net *net = seq->private;
 287
 288         count = 0;
 289         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 290                 val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
 291                 if (val) {
 292                         type[count] = i;
 293                         vals[count++] = val;
 294                 }
 295                 if (count == PERLINE) {
 296                         icmpmsg_put_line(seq, vals, type, count);
 297                         count = 0;
 298                 }
 299         }
 300         icmpmsg_put_line(seq, vals, type, count);
 301
 302 #undef PERLINE
 303 }
 304
 305 static void icmp_put(struct seq_file *seq)
 306 {
 307         int i;
 308         struct net *net = seq->private;
 309         atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
 310
 311         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 312         for (i=0; icmpmibmap[i].name != NULL; i++)
 313                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 314         seq_printf(seq, " OutMsgs OutErrors");
 315         for (i=0; icmpmibmap[i].name != NULL; i++)
 316                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 317         seq_printf(seq, "\nIcmp: %lu %lu",
 318                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
 319                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
 320         for (i=0; icmpmibmap[i].name != NULL; i++)
 321                 seq_printf(seq, " %lu",
 322                            atomic_long_read(ptr + icmpmibmap[i].index));
 323         seq_printf(seq, " %lu %lu",
 324                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
 325                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
 326         for (i=0; icmpmibmap[i].name != NULL; i++)
 327                 seq_printf(seq, " %lu",
 328                            atomic_long_read(ptr + (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         struct net *net = seq->private;
 338
 339         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 340
 341         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 342                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 343
 344         seq_printf(seq, "\nIp: %d %d",
 345                    IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
 346                    sysctl_ip_default_ttl);
 347
 348         BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
 349         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 350                 seq_printf(seq, " %llu",
 351                            snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
 352                                              snmp4_ipstats_list[i].entry,
 353                                              offsetof(struct ipstats_mib, syncp)));
 354
 355         icmp_put(seq);  /* RFC 2011 compatibility */
 356         icmpmsg_put(seq);
 357
 358         seq_puts(seq, "\nTcp:");
 359         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 360                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 361
 362         seq_puts(seq, "\nTcp:");
 363         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 364                 /* MaxConn field is signed, RFC 2012 */
 365                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 366                         seq_printf(seq, " %ld",
 367                                    snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 368                                                    snmp4_tcp_list[i].entry));
 369                 else
 370                         seq_printf(seq, " %lu",
 371                                    snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 372                                                    snmp4_tcp_list[i].entry));
 373         }
 374
 375         seq_puts(seq, "\nUdp:");
 376         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 377                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 378
 379         seq_puts(seq, "\nUdp:");
 380         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 381                 seq_printf(seq, " %lu",
 382                            snmp_fold_field((void __percpu **)net->mib.udp_statistics,
 383                                            snmp4_udp_list[i].entry));
 384
 385         /* the UDP and UDP-Lite MIBs are the same */
 386         seq_puts(seq, "\nUdpLite:");
 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, "\nUdpLite:");
 391         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 392                 seq_printf(seq, " %lu",
 393                            snmp_fold_field((void __percpu **)net->mib.udplite_statistics,
 394                                            snmp4_udp_list[i].entry));
 395
 396         seq_putc(seq, '\n');
 397         return 0;
 398 }
 399
 400 static int snmp_seq_open(struct inode *inode, struct file *file)
 401 {
 402         return single_open_net(inode, file, snmp_seq_show);
 403 }
 404
 405 static const struct file_operations snmp_seq_fops = {
 406         .owner   = THIS_MODULE,
 407         .open    = snmp_seq_open,
 408         .read    = seq_read,
 409         .llseek  = seq_lseek,
 410         .release = single_release_net,
 411 };
 412
 413
 414
 415 /*
 416  *      Output /proc/net/netstat
 417  */
 418 static int netstat_seq_show(struct seq_file *seq, void *v)
 419 {
 420         int i;
 421         struct net *net = seq->private;
 422
 423         seq_puts(seq, "TcpExt:");
 424         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 425                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 426
 427         seq_puts(seq, "\nTcpExt:");
 428         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 429                 seq_printf(seq, " %lu",
 430                            snmp_fold_field((void __percpu **)net->mib.net_statistics,
 431                                            snmp4_net_list[i].entry));
 432
 433         seq_puts(seq, "\nIpExt:");
 434         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 435                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 436
 437         seq_puts(seq, "\nIpExt:");
 438         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 439                 seq_printf(seq, " %llu",
 440                            snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
 441                                              snmp4_ipextstats_list[i].entry,
 442                                              offsetof(struct ipstats_mib, syncp)));
 443
 444         seq_putc(seq, '\n');
 445         return 0;
 446 }
 447
 448 static int netstat_seq_open(struct inode *inode, struct file *file)
 449 {
 450         return single_open_net(inode, file, netstat_seq_show);
 451 }
 452
 453 static const struct file_operations netstat_seq_fops = {
 454         .owner   = THIS_MODULE,
 455         .open    = netstat_seq_open,
 456         .read    = seq_read,
 457         .llseek  = seq_lseek,
 458         .release = single_release_net,
 459 };
 460
 461 static __net_init int ip_proc_init_net(struct net *net)
 462 {
 463         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 464                 goto out_sockstat;
 465         if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
 466                 goto out_netstat;
 467         if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
 468                 goto out_snmp;
 469
 470         return 0;
 471
 472 out_snmp:
 473         proc_net_remove(net, "netstat");
 474 out_netstat:
 475         proc_net_remove(net, "sockstat");
 476 out_sockstat:
 477         return -ENOMEM;
 478 }
 479
 480 static __net_exit void ip_proc_exit_net(struct net *net)
 481 {
 482         proc_net_remove(net, "snmp");
 483         proc_net_remove(net, "netstat");
 484         proc_net_remove(net, "sockstat");
 485 }
 486
 487 static __net_initdata struct pernet_operations ip_proc_ops = {
 488         .init = ip_proc_init_net,
 489         .exit = ip_proc_exit_net,
 490 };
 491
 492 int __init ip_misc_proc_init(void)
 493 {
 494         return register_pernet_subsys(&ip_proc_ops);
 495 }
 496