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/icmp.h>
  38 #include <net/protocol.h>
  39 #include <net/tcp.h>
  40 #include <net/udp.h>
  41 #include <net/udplite.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <net/sock.h>
  46 #include <net/raw.h>
  47
  48 static int fold_prot_inuse(struct proto *proto)
  49 {
  50         int res = 0;
  51         int cpu;
  52
  53         for_each_possible_cpu(cpu)
  54                 res += proto->stats[cpu].inuse;
  55
  56         return res;
  57 }
  58
  59 /*
  60  *      Report socket allocation statistics [mea@utu.fi]
  61  */
  62 static int sockstat_seq_show(struct seq_file *seq, void *v)
  63 {
  64         socket_seq_show(seq);
  65         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
  66                    fold_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count),
  67                    tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
  68                    atomic_read(&tcp_memory_allocated));
  69         seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_prot));
  70         seq_printf(seq, "UDPLITE: inuse %d\n", fold_prot_inuse(&udplite_prot));
  71         seq_printf(seq, "RAW: inuse %d\n", fold_prot_inuse(&raw_prot));
  72         seq_printf(seq,  "FRAG: inuse %d memory %d\n", ip_frag_nqueues,
  73                    atomic_read(&ip_frag_mem));
  74         return 0;
  75 }
  76
  77 static int sockstat_seq_open(struct inode *inode, struct file *file)
  78 {
  79         return single_open(file, sockstat_seq_show, NULL);
  80 }
  81
  82 static struct file_operations sockstat_seq_fops = {
  83         .owner   = THIS_MODULE,
  84         .open    = sockstat_seq_open,
  85         .read    = seq_read,
  86         .llseek  = seq_lseek,
  87         .release = single_release,
  88 };
  89
  90 static unsigned long
  91 fold_field(void *mib[], int offt)
  92 {
  93         unsigned long res = 0;
  94         int i;
  95
  96         for_each_possible_cpu(i) {
  97                 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
  98                 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
  99         }
 100         return res;
 101 }
 102
 103 /* snmp items */
 104 static const struct snmp_mib snmp4_ipstats_list[] = {
 105         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
 106         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
 107         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
 108         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
 109         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
 110         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
 111         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
 112         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
 113         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 114         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 115         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 116         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
 117         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
 118         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
 119         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
 120         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 121         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 122         SNMP_MIB_SENTINEL
 123 };
 124
 125 static const struct snmp_mib snmp4_icmp_list[] = {
 126         SNMP_MIB_ITEM("InMsgs", ICMP_MIB_INMSGS),
 127         SNMP_MIB_ITEM("InErrors", ICMP_MIB_INERRORS),
 128         SNMP_MIB_ITEM("InDestUnreachs", ICMP_MIB_INDESTUNREACHS),
 129         SNMP_MIB_ITEM("InTimeExcds", ICMP_MIB_INTIMEEXCDS),
 130         SNMP_MIB_ITEM("InParmProbs", ICMP_MIB_INPARMPROBS),
 131         SNMP_MIB_ITEM("InSrcQuenchs", ICMP_MIB_INSRCQUENCHS),
 132         SNMP_MIB_ITEM("InRedirects", ICMP_MIB_INREDIRECTS),
 133         SNMP_MIB_ITEM("InEchos", ICMP_MIB_INECHOS),
 134         SNMP_MIB_ITEM("InEchoReps", ICMP_MIB_INECHOREPS),
 135         SNMP_MIB_ITEM("InTimestamps", ICMP_MIB_INTIMESTAMPS),
 136         SNMP_MIB_ITEM("InTimestampReps", ICMP_MIB_INTIMESTAMPREPS),
 137         SNMP_MIB_ITEM("InAddrMasks", ICMP_MIB_INADDRMASKS),
 138         SNMP_MIB_ITEM("InAddrMaskReps", ICMP_MIB_INADDRMASKREPS),
 139         SNMP_MIB_ITEM("OutMsgs", ICMP_MIB_OUTMSGS),
 140         SNMP_MIB_ITEM("OutErrors", ICMP_MIB_OUTERRORS),
 141         SNMP_MIB_ITEM("OutDestUnreachs", ICMP_MIB_OUTDESTUNREACHS),
 142         SNMP_MIB_ITEM("OutTimeExcds", ICMP_MIB_OUTTIMEEXCDS),
 143         SNMP_MIB_ITEM("OutParmProbs", ICMP_MIB_OUTPARMPROBS),
 144         SNMP_MIB_ITEM("OutSrcQuenchs", ICMP_MIB_OUTSRCQUENCHS),
 145         SNMP_MIB_ITEM("OutRedirects", ICMP_MIB_OUTREDIRECTS),
 146         SNMP_MIB_ITEM("OutEchos", ICMP_MIB_OUTECHOS),
 147         SNMP_MIB_ITEM("OutEchoReps", ICMP_MIB_OUTECHOREPS),
 148         SNMP_MIB_ITEM("OutTimestamps", ICMP_MIB_OUTTIMESTAMPS),
 149         SNMP_MIB_ITEM("OutTimestampReps", ICMP_MIB_OUTTIMESTAMPREPS),
 150         SNMP_MIB_ITEM("OutAddrMasks", ICMP_MIB_OUTADDRMASKS),
 151         SNMP_MIB_ITEM("OutAddrMaskReps", ICMP_MIB_OUTADDRMASKREPS),
 152         SNMP_MIB_SENTINEL
 153 };
 154
 155 static const struct snmp_mib snmp4_tcp_list[] = {
 156         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 157         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 158         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 159         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 160         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 161         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 162         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 163         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 164         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 165         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 166         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 167         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 168         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 169         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 170         SNMP_MIB_SENTINEL
 171 };
 172
 173 static const struct snmp_mib snmp4_udp_list[] = {
 174         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 175         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 176         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 177         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 178         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 179         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 180         SNMP_MIB_SENTINEL
 181 };
 182
 183 static const struct snmp_mib snmp4_net_list[] = {
 184         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 185         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 186         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 187         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 188         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 189         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 190         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 191         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 192         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 193         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 194         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 195         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 196         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 197         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 198         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 199         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 200         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 201         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 202         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 203         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 204         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 205         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 206         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 207         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 208         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 209         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 210         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 211         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 212         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 213         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 214         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 215         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 216         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 217         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 218         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 219         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 220         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 221         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 222         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 223         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 224         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 225         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 226         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 227         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 228         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 229         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 230         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 231         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 232         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 233         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 234         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 235         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 236         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 237         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 238         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 239         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 240         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 241         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 242         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 243         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 244         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 245         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 246         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 247         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 248         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 249         SNMP_MIB_SENTINEL
 250 };
 251
 252 /*
 253  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 254  */
 255 static int snmp_seq_show(struct seq_file *seq, void *v)
 256 {
 257         int i;
 258
 259         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 260
 261         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 262                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 263
 264         seq_printf(seq, "\nIp: %d %d",
 265                         ipv4_devconf.forwarding ? 1 : 2, sysctl_ip_default_ttl);
 266
 267         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 268                 seq_printf(seq, " %lu",
 269                            fold_field((void **) ip_statistics,
 270                                       snmp4_ipstats_list[i].entry));
 271
 272         seq_puts(seq, "\nIcmp:");
 273         for (i = 0; snmp4_icmp_list[i].name != NULL; i++)
 274                 seq_printf(seq, " %s", snmp4_icmp_list[i].name);
 275
 276         seq_puts(seq, "\nIcmp:");
 277         for (i = 0; snmp4_icmp_list[i].name != NULL; i++)
 278                 seq_printf(seq, " %lu",
 279                            fold_field((void **) icmp_statistics,
 280                                       snmp4_icmp_list[i].entry));
 281
 282         seq_puts(seq, "\nTcp:");
 283         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 284                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 285
 286         seq_puts(seq, "\nTcp:");
 287         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 288                 /* MaxConn field is signed, RFC 2012 */
 289                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 290                         seq_printf(seq, " %ld",
 291                                    fold_field((void **) tcp_statistics,
 292                                               snmp4_tcp_list[i].entry));
 293                 else
 294                         seq_printf(seq, " %lu",
 295                                    fold_field((void **) tcp_statistics,
 296                                               snmp4_tcp_list[i].entry));
 297         }
 298
 299         seq_puts(seq, "\nUdp:");
 300         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 301                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 302
 303         seq_puts(seq, "\nUdp:");
 304         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 305                 seq_printf(seq, " %lu",
 306                            fold_field((void **) udp_statistics,
 307                                       snmp4_udp_list[i].entry));
 308
 309         /* the UDP and UDP-Lite MIBs are the same */
 310         seq_puts(seq, "\nUdpLite:");
 311         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 312                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 313
 314         seq_puts(seq, "\nUdpLite:");
 315         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 316                 seq_printf(seq, " %lu",
 317                            fold_field((void **) udplite_statistics,
 318                                       snmp4_udp_list[i].entry)     );
 319
 320         seq_putc(seq, '\n');
 321         return 0;
 322 }
 323
 324 static int snmp_seq_open(struct inode *inode, struct file *file)
 325 {
 326         return single_open(file, snmp_seq_show, NULL);
 327 }
 328
 329 static struct file_operations snmp_seq_fops = {
 330         .owner   = THIS_MODULE,
 331         .open    = snmp_seq_open,
 332         .read    = seq_read,
 333         .llseek  = seq_lseek,
 334         .release = single_release,
 335 };
 336
 337 /*
 338  *      Output /proc/net/netstat
 339  */
 340 static int netstat_seq_show(struct seq_file *seq, void *v)
 341 {
 342         int i;
 343
 344         seq_puts(seq, "TcpExt:");
 345         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 346                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 347
 348         seq_puts(seq, "\nTcpExt:");
 349         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 350                 seq_printf(seq, " %lu",
 351                            fold_field((void **) net_statistics,
 352                                       snmp4_net_list[i].entry));
 353
 354         seq_putc(seq, '\n');
 355         return 0;
 356 }
 357
 358 static int netstat_seq_open(struct inode *inode, struct file *file)
 359 {
 360         return single_open(file, netstat_seq_show, NULL);
 361 }
 362
 363 static struct file_operations netstat_seq_fops = {
 364         .owner   = THIS_MODULE,
 365         .open    = netstat_seq_open,
 366         .read    = seq_read,
 367         .llseek  = seq_lseek,
 368         .release = single_release,
 369 };
 370
 371 int __init ip_misc_proc_init(void)
 372 {
 373         int rc = 0;
 374
 375         if (!proc_net_fops_create("netstat", S_IRUGO, &netstat_seq_fops))
 376                 goto out_netstat;
 377
 378         if (!proc_net_fops_create("snmp", S_IRUGO, &snmp_seq_fops))
 379                 goto out_snmp;
 380
 381         if (!proc_net_fops_create("sockstat", S_IRUGO, &sockstat_seq_fops))
 382                 goto out_sockstat;
 383 out:
 384         return rc;
 385 out_sockstat:
 386         proc_net_remove("snmp");
 387 out_snmp:
 388         proc_net_remove("netstat");
 389 out_netstat:
 390         rc = -ENOMEM;
 391         goto out;
 392 }
 393