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