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         /* From net/socket.c */
  63         extern void socket_seq_show(struct seq_file *seq);
  64
  65         socket_seq_show(seq);
  66         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
  67                    fold_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count),
  68                    tcp_tw_count, atomic_read(&tcp_sockets_allocated),
  69                    atomic_read(&tcp_memory_allocated));
  70         seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_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 nr)
  92 {
  93         unsigned long res = 0;
  94         int i;
  95
  96         for (i = 0; i < NR_CPUS; i++) {
  97                 if (!cpu_possible(i))
  98                         continue;
  99                 res +=
 100                     *((unsigned long *) (((void *) per_cpu_ptr(mib[0], i)) +
 101                                          sizeof (unsigned long) * nr));
 102                 res +=
 103                     *((unsigned long *) (((void *) per_cpu_ptr(mib[1], i)) +
 104                                          sizeof (unsigned long) * nr));
 105         }
 106         return res;
 107 }
 108
 109 /*
 110  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 111  */
 112 static int snmp_seq_show(struct seq_file *seq, void *v)
 113 {
 114         int i;
 115
 116         seq_printf(seq, "Ip: Forwarding DefaultTTL InReceives InHdrErrors "
 117                         "InAddrErrors ForwDatagrams InUnknownProtos "
 118                         "InDiscards InDelivers OutRequests OutDiscards "
 119                         "OutNoRoutes ReasmTimeout ReasmReqds ReasmOKs "
 120                         "ReasmFails FragOKs FragFails FragCreates\nIp: %d %d",
 121                         ipv4_devconf.forwarding ? 1 : 2, sysctl_ip_default_ttl);
 122
 123         for (i = 0;
 124              i < offsetof(struct ip_mib, __pad) / sizeof(unsigned long); i++)
 125                 seq_printf(seq, " %lu",
 126                            fold_field((void **) ip_statistics, i));
 127
 128         seq_printf(seq, "\nIcmp: InMsgs InErrors InDestUnreachs InTimeExcds "
 129                         "InParmProbs InSrcQuenchs InRedirects InEchos "
 130                         "InEchoReps InTimestamps InTimestampReps InAddrMasks "
 131                         "InAddrMaskReps OutMsgs OutErrors OutDestUnreachs "
 132                         "OutTimeExcds OutParmProbs OutSrcQuenchs OutRedirects "
 133                         "OutEchos OutEchoReps OutTimestamps OutTimestampReps "
 134                         "OutAddrMasks OutAddrMaskReps\nIcmp:");
 135
 136         for (i = 0;
 137              i < offsetof(struct icmp_mib, dummy) / sizeof(unsigned long); i++)
 138                 seq_printf(seq, " %lu",
 139                            fold_field((void **) icmp_statistics, i));
 140
 141         seq_printf(seq, "\nTcp: RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens "
 142                         "PassiveOpens AttemptFails EstabResets CurrEstab "
 143                         "InSegs OutSegs RetransSegs InErrs OutRsts\nTcp:");
 144
 145         for (i = 0;
 146              i < offsetof(struct tcp_mib, __pad) / sizeof(unsigned long); i++) {
 147                 if (i == (offsetof(struct tcp_mib, TcpMaxConn) / sizeof(unsigned long)))
 148                         /* MaxConn field is negative, RFC 2012 */
 149                         seq_printf(seq, " %ld",
 150                                    fold_field((void **) tcp_statistics, i));
 151                 else
 152                         seq_printf(seq, " %lu",
 153                                    fold_field((void **) tcp_statistics, i));
 154         }
 155
 156         seq_printf(seq, "\nUdp: InDatagrams NoPorts InErrors OutDatagrams\n"
 157                         "Udp:");
 158
 159         for (i = 0;
 160              i < offsetof(struct udp_mib, __pad) / sizeof(unsigned long); i++)
 161                 seq_printf(seq, " %lu",
 162                                 fold_field((void **) udp_statistics, i));
 163
 164         seq_putc(seq, '\n');
 165         return 0;
 166 }
 167
 168 static int snmp_seq_open(struct inode *inode, struct file *file)
 169 {
 170         return single_open(file, snmp_seq_show, NULL);
 171 }
 172
 173 static struct file_operations snmp_seq_fops = {
 174         .owner   = THIS_MODULE,
 175         .open    = snmp_seq_open,
 176         .read    = seq_read,
 177         .llseek  = seq_lseek,
 178         .release = single_release,
 179 };
 180
 181 /*
 182  *      Output /proc/net/netstat
 183  */
 184 static int netstat_seq_show(struct seq_file *seq, void *v)
 185 {
 186         int i;
 187
 188         seq_puts(seq, "TcpExt: SyncookiesSent SyncookiesRecv SyncookiesFailed"
 189                       " EmbryonicRsts PruneCalled RcvPruned OfoPruned"
 190                       " OutOfWindowIcmps LockDroppedIcmps ArpFilter"
 191                       " TW TWRecycled TWKilled"
 192                       " PAWSPassive PAWSActive PAWSEstab"
 193                       " DelayedACKs DelayedACKLocked DelayedACKLost"
 194                       " ListenOverflows ListenDrops"
 195                       " TCPPrequeued TCPDirectCopyFromBacklog"
 196                       " TCPDirectCopyFromPrequeue TCPPrequeueDropped"
 197                       " TCPHPHits TCPHPHitsToUser"
 198                       " TCPPureAcks TCPHPAcks"
 199                       " TCPRenoRecovery TCPSackRecovery"
 200                       " TCPSACKReneging"
 201                       " TCPFACKReorder TCPSACKReorder TCPRenoReorder"
 202                       " TCPTSReorder"
 203                       " TCPFullUndo TCPPartialUndo TCPDSACKUndo TCPLossUndo"
 204                       " TCPLoss TCPLostRetransmit"
 205                       " TCPRenoFailures TCPSackFailures TCPLossFailures"
 206                       " TCPFastRetrans TCPForwardRetrans TCPSlowStartRetrans"
 207                       " TCPTimeouts"
 208                       " TCPRenoRecoveryFail TCPSackRecoveryFail"
 209                       " TCPSchedulerFailed TCPRcvCollapsed"
 210                       " TCPDSACKOldSent TCPDSACKOfoSent TCPDSACKRecv"
 211                       " TCPDSACKOfoRecv"
 212                       " TCPAbortOnSyn TCPAbortOnData TCPAbortOnClose"
 213                       " TCPAbortOnMemory TCPAbortOnTimeout TCPAbortOnLinger"
 214                       " TCPAbortFailed TCPMemoryPressures\n"
 215                       "TcpExt:");
 216         for (i = 0;
 217              i < offsetof(struct linux_mib, __pad) / sizeof(unsigned long);
 218              i++)
 219                 seq_printf(seq, " %lu",
 220                            fold_field((void **) net_statistics, i));
 221         seq_putc(seq, '\n');
 222         return 0;
 223 }
 224
 225 static int netstat_seq_open(struct inode *inode, struct file *file)
 226 {
 227         return single_open(file, netstat_seq_show, NULL);
 228 }
 229
 230 static struct file_operations netstat_seq_fops = {
 231         .owner   = THIS_MODULE,
 232         .open    = netstat_seq_open,
 233         .read    = seq_read,
 234         .llseek  = seq_lseek,
 235         .release = single_release,
 236 };
 237
 238 int __init ip_misc_proc_init(void)
 239 {
 240         int rc = 0;
 241         struct proc_dir_entry *p;
 242
 243         p = create_proc_entry("netstat", S_IRUGO, proc_net);
 244         if (!p)
 245                 goto out_netstat;
 246         p->proc_fops = &netstat_seq_fops;
 247
 248         p = create_proc_entry("snmp", S_IRUGO, proc_net);
 249         if (!p)
 250                 goto out_snmp;
 251         p->proc_fops = &snmp_seq_fops;
 252
 253         p = create_proc_entry("sockstat", S_IRUGO, proc_net);
 254         if (!p)
 255                 goto out_sockstat;
 256         p->proc_fops = &sockstat_seq_fops;
 257 out:
 258         return rc;
 259 out_sockstat:
 260         remove_proc_entry("snmp", proc_net);
 261 out_snmp:
 262         remove_proc_entry("netstat", proc_net);
 263 out_netstat:
 264         rc = -ENOMEM;
 265         goto out;
 266 }
 267