/* * 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. * * 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/bottom_half.h>#include <linux/inetdevice.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/export.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;	int orphans, sockets; 	local_bh_disable();	orphans = percpu_counter_sum_positive(&tcp_orphan_count);	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);	local_bh_enable(); 	socket_seq_show(seq);	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",		   sock_prot_inuse_get(net, &tcp_prot), orphans,		   tcp_death_row.tw_count, sockets,		   proto_memory_allocated(&tcp_prot));	seq_printf(seq, "UDP: inuse %d mem %ld\n",		   sock_prot_inuse_get(net, &udp_prot),		   proto_memory_allocated(&udp_prot));	seq_printf(seq, "UDPLITE: inuse %d\n",		   sock_prot_inuse_get(net, &udplite_prot));	seq_printf(seq, "RAW: inuse %d\n",		   sock_prot_inuse_get(net, &raw_prot));	seq_printf(seq,  "FRAG: inuse %d memory %d\n",			ip_frag_nqueues(net), ip_frag_mem(net));	return 0;} static int sockstat_seq_open(struct inode *inode, struct file *file){	return single_open_net(inode, file, sockstat_seq_show);} static const struct file_operations sockstat_seq_fops = {	.owner	 = THIS_MODULE,	.open	 = sockstat_seq_open,	.read	 = seq_read,	.llseek	 = seq_lseek,	.release = single_release_net,}; /* snmp items */static const struct snmp_mib snmp4_ipstats_list[] = {	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),	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_OUTPKTS),	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 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_ITEM("InOctets", IPSTATS_MIB_INOCTETS),	SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),	SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),	/* Non RFC4293 fields */	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),	SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),	SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),	SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),	SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),	SNMP_MIB_SENTINEL}; static const struct {	const 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_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),	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_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),	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("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("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),	SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),	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("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_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),	SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),	SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),	SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),	SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),	SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),	SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),	SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),	SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),	SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),	SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),	SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),	SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),	SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),	SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),	SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),	SNMP_MIB_SENTINEL}; static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,			     unsigned short *type, int count){	int j; 	if (count) {		seq_printf(seq, "\nIcmpMsg:");		for (j = 0; j < count; ++j)			seq_printf(seq, " %sType%u",				type[j] & 0x100 ? "Out" : "In",				type[j] & 0xff);		seq_printf(seq, "\nIcmpMsg:");		for (j = 0; j < count; ++j)			seq_printf(seq, " %lu", vals[j]);	}} static void icmpmsg_put(struct seq_file *seq){#define PERLINE	16 	int i, count;	unsigned short type[PERLINE];	unsigned long vals[PERLINE], val;	struct net *net = seq->private; 	count = 0;	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {		val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);		if (val) {			type[count] = i;			vals[count++] = val;		}		if (count == PERLINE) {			icmpmsg_put_line(seq, vals, type, count);			count = 0;		}	}	icmpmsg_put_line(seq, vals, type, count); #undef PERLINE} static void icmp_put(struct seq_file *seq){	int i;	struct net *net = seq->private;	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs; 	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");	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, "\nIcmp: %lu %lu %lu",		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS),		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));	for (i=0; icmpmibmap[i].name != NULL; i++)		seq_printf(seq, " %lu",			   atomic_long_read(ptr + icmpmibmap[i].index));	seq_printf(seq, " %lu %lu",		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));	for (i=0; icmpmibmap[i].name != NULL; i++)		seq_printf(seq, " %lu",			   atomic_long_read(ptr + (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;	struct net *net = seq->private; 	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, "\nIp: %d %d",		   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,		   sysctl_ip_default_ttl); 	BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)		seq_printf(seq, " %llu",			   snmp_fold_field64((void __percpu **)net->mib.ip_statistics,					     snmp4_ipstats_list[i].entry,					     offsetof(struct ipstats_mib, syncp))); 	icmp_put(seq);	/* RFC 2011 compatibility */	icmpmsg_put(seq); 	seq_puts(seq, "\nTcp:");	for (i = 0; snmp4_tcp_list[i].name != NULL; i++)		seq_printf(seq, " %s", snmp4_tcp_list[i].name); 	seq_puts(seq, "\nTcp:");	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 __percpu **)net->mib.tcp_statistics,						   snmp4_tcp_list[i].entry));		else			seq_printf(seq, " %lu",				   snmp_fold_field((void __percpu **)net->mib.tcp_statistics,						   snmp4_tcp_list[i].entry));	} 	seq_puts(seq, "\nUdp:");	for (i = 0; snmp4_udp_list[i].name != NULL; i++)		seq_printf(seq, " %s", snmp4_udp_list[i].name); 	seq_puts(seq, "\nUdp:");	for (i = 0; snmp4_udp_list[i].name != NULL; i++)		seq_printf(seq, " %lu",			   snmp_fold_field((void __percpu **)net->mib.udp_statistics,					   snmp4_udp_list[i].entry)); 	/* the UDP and UDP-Lite MIBs are the same */	seq_puts(seq, "\nUdpLite:");	for (i = 0; snmp4_udp_list[i].name != NULL; i++)		seq_printf(seq, " %s", snmp4_udp_list[i].name); 	seq_puts(seq, "\nUdpLite:");	for (i = 0; snmp4_udp_list[i].name != NULL; i++)		seq_printf(seq, " %lu",			   snmp_fold_field((void __percpu **)net->mib.udplite_statistics,					   snmp4_udp_list[i].entry)); 	seq_putc(seq, '\n');	return 0;} static int snmp_seq_open(struct inode *inode, struct file *file){	return single_open_net(inode, file, snmp_seq_show);} static const struct file_operations snmp_seq_fops = {	.owner	 = THIS_MODULE,	.open	 = snmp_seq_open,	.read	 = seq_read,	.llseek	 = seq_lseek,	.release = single_release_net,};   /* *	Output /proc/net/netstat */static int netstat_seq_show(struct seq_file *seq, void *v){	int i;	struct net *net = seq->private; 	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, "\nTcpExt:");	for (i = 0; snmp4_net_list[i].name != NULL; i++)		seq_printf(seq, " %lu",			   snmp_fold_field((void __percpu **)net->mib.net_statistics,					   snmp4_net_list[i].entry)); 	seq_puts(seq, "\nIpExt:");	for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name); 	seq_puts(seq, "\nIpExt:");	for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)		seq_printf(seq, " %llu",			   snmp_fold_field64((void __percpu **)net->mib.ip_statistics,					     snmp4_ipextstats_list[i].entry,					     offsetof(struct ipstats_mib, syncp))); 	seq_putc(seq, '\n');	return 0;} static int netstat_seq_open(struct inode *inode, struct file *file){	return single_open_net(inode, file, netstat_seq_show);} static const struct file_operations netstat_seq_fops = {	.owner	 = THIS_MODULE,	.open	 = netstat_seq_open,	.read	 = seq_read,	.llseek	 = seq_lseek,	.release = single_release_net,}; static __net_init int ip_proc_init_net(struct net *net){	if (!proc_create("sockstat", S_IRUGO, net->proc_net,			 &sockstat_seq_fops))		goto out_sockstat;	if (!proc_create("netstat", S_IRUGO, net->proc_net, &netstat_seq_fops))		goto out_netstat;	if (!proc_create("snmp", S_IRUGO, net->proc_net, &snmp_seq_fops))		goto out_snmp; 	return 0; out_snmp:	remove_proc_entry("netstat", net->proc_net);out_netstat:	remove_proc_entry("sockstat", net->proc_net);

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