/*
   * INET		An implementation of the TCP/IP protocol suite for the LINUX
   *		operating system.  INET is implemented using the  BSD Socket
   *		interface as the means of communication with the user level.
   *
   *		This file implements the various access functions for the
   *		PROC file system.  It is mainly used for debugging and
   *		statistics.
   *
   * Version:	$Id: proc.c,v 1.45 2001/05/16 16:45:35 davem Exp $
   *
   * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
   *		Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
   *		Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
   *		Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
   *
   * Fixes:
   *		Alan Cox	:	UDP sockets show the rxqueue/txqueue
   *					using hint flag for the netinfo.
   *	Pauline Middelink	:	identd support
   *		Alan Cox	:	Make /proc safer.
   *	Erik Schoenfelder	:	/proc/net/snmp
   *		Alan Cox	:	Handle dead sockets properly.
   *	Gerhard Koerting	:	Show both timers
   *		Alan Cox	:	Allow inode to be NULL (kernel socket)
   *	Andi Kleen		:	Add support for open_requests and
   *					split functions for more readibility.
   *	Andi Kleen		:	Add support for /proc/net/netstat
   *	Arnaldo C. Melo		:	Convert to seq_file
   *
   *		This program is free software; you can redistribute it and/or
   *		modify it under the terms of the GNU General Public License
   *		as published by the Free Software Foundation; either version
   *		2 of the License, or (at your option) any later version.
   */
  #include <linux/types.h>

  #include <net/net_namespace.h>

  #include <net/icmp.h>
  #include <net/protocol.h>
  #include <net/tcp.h>
  #include <net/udp.h>

  #include <net/udplite.h>

  #include <linux/inetdevice.h>

  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>
  #include <net/sock.h>
  #include <net/raw.h>

  /*
   *	Report socket allocation statistics [mea@utu.fi]
   */
  static int sockstat_seq_show(struct seq_file *seq, void *v)
  {

  	struct net *net = seq->private;

  	socket_seq_show(seq);
  	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d
  ",

  		   sock_prot_inuse_get(net, &tcp_prot),

  		   atomic_read(&tcp_orphan_count),

  		   tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),

  		   atomic_read(&tcp_memory_allocated));

  	seq_printf(seq, "UDP: inuse %d mem %d
  ",

  		   sock_prot_inuse_get(net, &udp_prot),

  		   atomic_read(&udp_memory_allocated));

  	seq_printf(seq, "UDPLITE: inuse %d
  ",

  		   sock_prot_inuse_get(net, &udplite_prot));

  	seq_printf(seq, "RAW: inuse %d
  ",

  		   sock_prot_inuse_get(net, &raw_prot));

  	seq_printf(seq,  "FRAG: inuse %d memory %d
  ",

  			ip_frag_nqueues(net), ip_frag_mem(net));

  	return 0;
  }
  
  static int sockstat_seq_open(struct inode *inode, struct file *file)
  {

  	int err;
  	struct net *net;
  
  	err = -ENXIO;
  	net = get_proc_net(inode);
  	if (net == NULL)
  		goto err_net;
  
  	err = single_open(file, sockstat_seq_show, net);
  	if (err < 0)
  		goto err_open;
  
  	return 0;
  
  err_open:
  	put_net(net);
  err_net:
  	return err;
  }
  
  static int sockstat_seq_release(struct inode *inode, struct file *file)
  {
  	struct net *net = ((struct seq_file *)file->private_data)->private;
  
  	put_net(net);
  	return single_release(inode, file);

  }

  static const struct file_operations sockstat_seq_fops = {

  	.owner	 = THIS_MODULE,
  	.open	 = sockstat_seq_open,
  	.read	 = seq_read,
  	.llseek	 = seq_lseek,

  	.release = sockstat_seq_release,

  };

  /* snmp items */

  static const struct snmp_mib snmp4_ipstats_list[] = {

  	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
  	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
  	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
  	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
  	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
  	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
  	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
  	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
  	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
  	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
  	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
  	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
  	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
  	SNMP_MIB_SENTINEL
  };

  /* Following RFC4293 items are displayed in /proc/net/netstat */
  static const struct snmp_mib snmp4_ipextstats_list[] = {
  	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
  	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
  	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
  	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
  	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
  	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
  	SNMP_MIB_SENTINEL
  };

  static struct {
  	char *name;
  	int index;
  } icmpmibmap[] = {
  	{ "DestUnreachs", ICMP_DEST_UNREACH },
  	{ "TimeExcds", ICMP_TIME_EXCEEDED },
  	{ "ParmProbs", ICMP_PARAMETERPROB },
  	{ "SrcQuenchs", ICMP_SOURCE_QUENCH },
  	{ "Redirects", ICMP_REDIRECT },
  	{ "Echos", ICMP_ECHO },
  	{ "EchoReps", ICMP_ECHOREPLY },
  	{ "Timestamps", ICMP_TIMESTAMP },
  	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
  	{ "AddrMasks", ICMP_ADDRESS },
  	{ "AddrMaskReps", ICMP_ADDRESSREPLY },

  	{ NULL, 0 }

  };

  static const struct snmp_mib snmp4_tcp_list[] = {

  	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
  	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
  	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
  	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
  	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
  	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
  	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
  	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
  	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
  	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
  	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
  	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
  	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
  	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
  	SNMP_MIB_SENTINEL
  };

  static const struct snmp_mib snmp4_udp_list[] = {

  	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
  	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
  	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
  	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),

  	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
  	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),

  	SNMP_MIB_SENTINEL
  };

  static const struct snmp_mib snmp4_net_list[] = {

  	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
  	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
  	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
  	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
  	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
  	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
  	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
  	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
  	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
  	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
  	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
  	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
  	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
  	SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
  	SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
  	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
  	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
  	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
  	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
  	SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
  	SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
  	SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
  	SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
  	SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
  	SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
  	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
  	SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
  	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
  	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
  	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
  	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
  	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
  	SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
  	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
  	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
  	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
  	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
  	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
  	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
  	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
  	SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
  	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
  	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
  	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
  	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
  	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
  	SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
  	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
  	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
  	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
  	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
  	SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
  	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
  	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
  	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
  	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
  	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
  	SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
  	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
  	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
  	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
  	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
  	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
  	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
  	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),

  	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
  	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
  	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),

  	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),

  	SNMP_MIB_SENTINEL
  };

  static void icmpmsg_put(struct seq_file *seq)
  {
  #define PERLINE	16
  
  	int j, i, count;
  	static int out[PERLINE];
  
  	count = 0;
  	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
  
  		if (snmp_fold_field((void **) icmpmsg_statistics, i))
  			out[count++] = i;
  		if (count < PERLINE)
  			continue;
  
  		seq_printf(seq, "
  IcmpMsg:");
  		for (j = 0; j < PERLINE; ++j)
  			seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
  					i & 0xff);
  		seq_printf(seq, "
  IcmpMsg: ");
  		for (j = 0; j < PERLINE; ++j)
  			seq_printf(seq, " %lu",
  				snmp_fold_field((void **) icmpmsg_statistics,
  				out[j]));
  		seq_putc(seq, '
  ');
  	}
  	if (count) {
  		seq_printf(seq, "
  IcmpMsg:");
  		for (j = 0; j < count; ++j)
  			seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :
  				"In", out[j] & 0xff);
  		seq_printf(seq, "
  IcmpMsg:");
  		for (j = 0; j < count; ++j)
  			seq_printf(seq, " %lu", snmp_fold_field((void **)
  				icmpmsg_statistics, out[j]));
  	}
  
  #undef PERLINE
  }
  
  static void icmp_put(struct seq_file *seq)
  {
  	int i;
  
  	seq_puts(seq, "
  Icmp: InMsgs InErrors");
  	for (i=0; icmpmibmap[i].name != NULL; i++)
  		seq_printf(seq, " In%s", icmpmibmap[i].name);
  	seq_printf(seq, " OutMsgs OutErrors");
  	for (i=0; icmpmibmap[i].name != NULL; i++)
  		seq_printf(seq, " Out%s", icmpmibmap[i].name);
  	seq_printf(seq, "
  Icmp: %lu %lu",
  		snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),
  		snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));
  	for (i=0; icmpmibmap[i].name != NULL; i++)
  		seq_printf(seq, " %lu",
  			snmp_fold_field((void **) icmpmsg_statistics,
  				icmpmibmap[i].index));
  	seq_printf(seq, " %lu %lu",
  		snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),
  		snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));
  	for (i=0; icmpmibmap[i].name != NULL; i++)
  		seq_printf(seq, " %lu",
  			snmp_fold_field((void **) icmpmsg_statistics,

  				icmpmibmap[i].index | 0x100));

  }

  /*
   *	Called from the PROCfs module. This outputs /proc/net/snmp.
   */
  static int snmp_seq_show(struct seq_file *seq, void *v)
  {
  	int i;
  
  	seq_puts(seq, "Ip: Forwarding DefaultTTL");
  
  	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
  		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
  
  	seq_printf(seq, "
  Ip: %d %d",

  		   IPV4_DEVCONF_ALL(&init_net, FORWARDING) ? 1 : 2,
  		   sysctl_ip_default_ttl);

  
  	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
  		seq_printf(seq, " %lu",

  			   snmp_fold_field((void **)ip_statistics,
  					   snmp4_ipstats_list[i].entry));

  	icmp_put(seq);	/* RFC 2011 compatibility */
  	icmpmsg_put(seq);

  
  	seq_puts(seq, "
  Tcp:");
  	for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
  		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
  
  	seq_puts(seq, "
  Tcp:");
  	for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
  		/* MaxConn field is signed, RFC 2012 */
  		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
  			seq_printf(seq, " %ld",

  				   snmp_fold_field((void **)tcp_statistics,
  						   snmp4_tcp_list[i].entry));

  		else
  			seq_printf(seq, " %lu",

  				   snmp_fold_field((void **)tcp_statistics,
  						   snmp4_tcp_list[i].entry));

  	}
  
  	seq_puts(seq, "
  Udp:");
  	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
  		seq_printf(seq, " %s", snmp4_udp_list[i].name);
  
  	seq_puts(seq, "
  Udp:");
  	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
  		seq_printf(seq, " %lu",

  			   snmp_fold_field((void **)udp_statistics,
  					   snmp4_udp_list[i].entry));

  	/* the UDP and UDP-Lite MIBs are the same */
  	seq_puts(seq, "
  UdpLite:");
  	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
  		seq_printf(seq, " %s", snmp4_udp_list[i].name);
  
  	seq_puts(seq, "
  UdpLite:");
  	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
  		seq_printf(seq, " %lu",

  			   snmp_fold_field((void **)udplite_statistics,
  					   snmp4_udp_list[i].entry));

  	seq_putc(seq, '
  ');
  	return 0;
  }
  
  static int snmp_seq_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, snmp_seq_show, NULL);
  }

  static const struct file_operations snmp_seq_fops = {

  	.owner	 = THIS_MODULE,
  	.open	 = snmp_seq_open,
  	.read	 = seq_read,
  	.llseek	 = seq_lseek,
  	.release = single_release,
  };

  /*
   *	Output /proc/net/netstat
   */
  static int netstat_seq_show(struct seq_file *seq, void *v)
  {
  	int i;
  
  	seq_puts(seq, "TcpExt:");
  	for (i = 0; snmp4_net_list[i].name != NULL; i++)
  		seq_printf(seq, " %s", snmp4_net_list[i].name);
  
  	seq_puts(seq, "
  TcpExt:");
  	for (i = 0; snmp4_net_list[i].name != NULL; i++)
  		seq_printf(seq, " %lu",

  			   snmp_fold_field((void **)net_statistics,
  					   snmp4_net_list[i].entry));

  	seq_puts(seq, "
  IpExt:");
  	for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
  		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
  
  	seq_puts(seq, "
  IpExt:");
  	for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
  		seq_printf(seq, " %lu",
  			   snmp_fold_field((void **)ip_statistics,
  					   snmp4_ipextstats_list[i].entry));

  	seq_putc(seq, '
  ');
  	return 0;
  }
  
  static int netstat_seq_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, netstat_seq_show, NULL);
  }

  static const struct file_operations netstat_seq_fops = {

  	.owner	 = THIS_MODULE,
  	.open	 = netstat_seq_open,
  	.read	 = seq_read,
  	.llseek	 = seq_lseek,
  	.release = single_release,
  };

  static __net_init int ip_proc_init_net(struct net *net)
  {
  	if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
  		return -ENOMEM;
  	return 0;
  }
  
  static __net_exit void ip_proc_exit_net(struct net *net)
  {
  	proc_net_remove(net, "sockstat");
  }
  
  static __net_initdata struct pernet_operations ip_proc_ops = {
  	.init = ip_proc_init_net,
  	.exit = ip_proc_exit_net,
  };

  int __init ip_misc_proc_init(void)
  {
  	int rc = 0;

  	if (register_pernet_subsys(&ip_proc_ops))
  		goto out_pernet;

  	if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))

  		goto out_netstat;

  	if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))

  		goto out_snmp;

  out:
  	return rc;

  out_snmp:

  	proc_net_remove(&init_net, "netstat");

  out_netstat:

  	unregister_pernet_subsys(&ip_proc_ops);
  out_pernet:

  	rc = -ENOMEM;
  	goto out;
  }