/*
 * 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 1.41 2000/01/21 23:45:57 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
 *
 *		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 <asm/system.h>
#include <linux/sched.h>
#include <linux/socket.h>
#include <linux/net.h>
#include <linux/un.h>
#include <linux/in.h>
#include <linux/param.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/raw.h>

static int fold_prot_inuse(struct proto *proto)
{
	int res = 0;
	int cpu;

	for (cpu=0; cpu<smp_num_cpus; cpu++)
		res += proto->stats[cpu].inuse;

	return res;
}

/*
 *	Report socket allocation statistics [mea@utu.fi]
 */
int afinet_get_info(char *buffer, char **start, off_t offset, int length)
{
	/* From  net/socket.c  */
	extern int socket_get_info(char *, char **, off_t, int);

	int len  = socket_get_info(buffer,start,offset,length);

	len += sprintf(buffer+len,"TCP: inuse %d orphan %d tw %d\n",
		       fold_prot_inuse(&tcp_prot),
		       atomic_read(&tcp_orphan_count), tcp_tw_count);
	len += sprintf(buffer+len,"UDP: inuse %d\n",
		       fold_prot_inuse(&udp_prot));
	len += sprintf(buffer+len,"RAW: inuse %d\n",
		       fold_prot_inuse(&raw_prot));
	if (offset >= len)
	{
		*start = buffer;
		return 0;
	}
	*start = buffer + offset;
	len -= offset;
	if (len > length)
		len = length;
	if (len < 0)
		len = 0;
	return len;
}

static unsigned long fold_field(unsigned long *begin, int sz, int nr)
{
	unsigned long res = 0;
	int i;

	sz /= sizeof(unsigned long);

	for (i=0; i<2*smp_num_cpus; i++)
		res += begin[i*sz + nr];
	return res;
}

/* 
 *	Called from the PROCfs module. This outputs /proc/net/snmp.
 */
 
int snmp_get_info(char *buffer, char **start, off_t offset, int length)
{
	extern int sysctl_ip_default_ttl;
	int len, i;

	len = sprintf (buffer,
		"Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreates\n"
		"Ip: %d %d", ipv4_devconf.forwarding ? 1 : 2, sysctl_ip_default_ttl);
	for (i=0; i<offsetof(struct ip_mib, __pad)/sizeof(unsigned long); i++)
		len += sprintf(buffer+len, " %lu", fold_field((unsigned long*)ip_statistics, sizeof(struct ip_mib), i));

	len += sprintf (buffer + len,
		"\nIcmp: InMsgs InErrors InDestUnreachs InTimeExcds InParmProbs InSrcQuenchs InRedirects InEchos InEchoReps InTimestamps InTimestampReps InAddrMasks InAddrMaskReps OutMsgs OutErrors OutDestUnreachs OutTimeExcds OutParmProbs OutSrcQuenchs OutRedirects OutEchos OutEchoReps OutTimestamps OutTimestampReps OutAddrMasks OutAddrMaskReps\n"
		  "Icmp:");
	for (i=0; i<offsetof(struct icmp_mib, __pad)/sizeof(unsigned long); i++)
		len += sprintf(buffer+len, " %lu", fold_field((unsigned long*)icmp_statistics, sizeof(struct icmp_mib), i));

	len += sprintf (buffer + len,
		"\nTcp: RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens PassiveOpens AttemptFails EstabResets CurrEstab InSegs OutSegs RetransSegs InErrs OutRsts\n"
		  "Tcp:");
	for (i=0; i<offsetof(struct tcp_mib, __pad)/sizeof(unsigned long); i++)
		len += sprintf(buffer+len, " %lu", fold_field((unsigned long*)tcp_statistics, sizeof(struct tcp_mib), i));

	len += sprintf (buffer + len,
		"\nUdp: InDatagrams NoPorts InErrors OutDatagrams\n"
		  "Udp:");
	for (i=0; i<offsetof(struct udp_mib, __pad)/sizeof(unsigned long); i++)
		len += sprintf(buffer+len, " %lu", fold_field((unsigned long*)udp_statistics, sizeof(struct udp_mib), i));

	len += sprintf (buffer + len, "\n");

	if (offset >= len)
	{
		*start = buffer;
		return 0;
	}
	*start = buffer + offset;
	len -= offset;
	if (len > length)
		len = length;
	if (len < 0)
		len = 0; 
	return len;
}

/* 
 *	Output /proc/net/netstat
 */
 
int netstat_get_info(char *buffer, char **start, off_t offset, int length)
{
	int len, i;

	len = sprintf(buffer,
		      "TcpExt: SyncookiesSent SyncookiesRecv SyncookiesFailed"
		      " EmbryonicRsts PruneCalled RcvPruned OfoPruned"
		      " OutOfWindowIcmps LockDroppedIcmps"
		      " TW TWRecycled TWKilled"
		      " PAWSPassive PAWSActive PAWSEstab"
		      " DelayedACKs DelayedACKLocked DelayedACKLost"
		      " ListenOverflows ListenDrops"
		      " TCPPrequeued TCPDirectCopyFromBacklog"
		      " TCPDirectCopyFromPrequeue TCPPrequeueDropped"
		      " TCPHPHits TCPHPHitsToUser\n"
		      "TcpExt:");
	for (i=0; i<offsetof(struct linux_mib, __pad)/sizeof(unsigned long); i++)
		len += sprintf(buffer+len, " %lu", fold_field((unsigned long*)net_statistics, sizeof(struct linux_mib), i));

	len += sprintf (buffer + len, "\n");

	if (offset >= len)
	{
		*start = buffer;
		return 0;
	}
	*start = buffer + offset;
	len -= offset;
	if (len > length)
		len = length;
	if (len < 0)
		len = 0; 
	return len;
}