xref: /openbmc/linux/net/ipv4/proc.c (revision a2818ee4)
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  * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11  *		Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
12  *		Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
13  *		Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
14  *
15  * Fixes:
16  *		Alan Cox	:	UDP sockets show the rxqueue/txqueue
17  *					using hint flag for the netinfo.
18  *	Pauline Middelink	:	identd support
19  *		Alan Cox	:	Make /proc safer.
20  *	Erik Schoenfelder	:	/proc/net/snmp
21  *		Alan Cox	:	Handle dead sockets properly.
22  *	Gerhard Koerting	:	Show both timers
23  *		Alan Cox	:	Allow inode to be NULL (kernel socket)
24  *	Andi Kleen		:	Add support for open_requests and
25  *					split functions for more readibility.
26  *	Andi Kleen		:	Add support for /proc/net/netstat
27  *	Arnaldo C. Melo		:	Convert to seq_file
28  *
29  *		This program is free software; you can redistribute it and/or
30  *		modify it under the terms of the GNU General Public License
31  *		as published by the Free Software Foundation; either version
32  *		2 of the License, or (at your option) any later version.
33  */
34 #include <linux/types.h>
35 #include <net/net_namespace.h>
36 #include <net/icmp.h>
37 #include <net/protocol.h>
38 #include <net/tcp.h>
39 #include <net/udp.h>
40 #include <net/udplite.h>
41 #include <linux/bottom_half.h>
42 #include <linux/inetdevice.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/export.h>
46 #include <net/sock.h>
47 #include <net/raw.h>
48 
49 #define TCPUDP_MIB_MAX max_t(u32, UDP_MIB_MAX, TCP_MIB_MAX)
50 
51 /*
52  *	Report socket allocation statistics [mea@utu.fi]
53  */
54 static int sockstat_seq_show(struct seq_file *seq, void *v)
55 {
56 	struct net *net = seq->private;
57 	int orphans, sockets;
58 
59 	orphans = percpu_counter_sum_positive(&tcp_orphan_count);
60 	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
61 
62 	socket_seq_show(seq);
63 	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
64 		   sock_prot_inuse_get(net, &tcp_prot), orphans,
65 		   atomic_read(&net->ipv4.tcp_death_row.tw_count), sockets,
66 		   proto_memory_allocated(&tcp_prot));
67 	seq_printf(seq, "UDP: inuse %d mem %ld\n",
68 		   sock_prot_inuse_get(net, &udp_prot),
69 		   proto_memory_allocated(&udp_prot));
70 	seq_printf(seq, "UDPLITE: inuse %d\n",
71 		   sock_prot_inuse_get(net, &udplite_prot));
72 	seq_printf(seq, "RAW: inuse %d\n",
73 		   sock_prot_inuse_get(net, &raw_prot));
74 	seq_printf(seq,  "FRAG: inuse %u memory %lu\n",
75 		   atomic_read(&net->ipv4.frags.rhashtable.nelems),
76 		   frag_mem_limit(&net->ipv4.frags));
77 	return 0;
78 }
79 
80 /* snmp items */
81 static const struct snmp_mib snmp4_ipstats_list[] = {
82 	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
83 	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
84 	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
85 	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
86 	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
87 	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
88 	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
89 	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
90 	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
91 	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
92 	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
93 	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
94 	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
95 	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
96 	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
97 	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
98 	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
99 	SNMP_MIB_SENTINEL
100 };
101 
102 /* Following items are displayed in /proc/net/netstat */
103 static const struct snmp_mib snmp4_ipextstats_list[] = {
104 	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
105 	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
106 	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
107 	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
108 	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
109 	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
110 	SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
111 	SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
112 	SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
113 	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
114 	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
115 	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
116 	/* Non RFC4293 fields */
117 	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
118 	SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
119 	SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
120 	SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
121 	SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),
122 	SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),
123 	SNMP_MIB_SENTINEL
124 };
125 
126 static const struct {
127 	const char *name;
128 	int index;
129 } icmpmibmap[] = {
130 	{ "DestUnreachs", ICMP_DEST_UNREACH },
131 	{ "TimeExcds", ICMP_TIME_EXCEEDED },
132 	{ "ParmProbs", ICMP_PARAMETERPROB },
133 	{ "SrcQuenchs", ICMP_SOURCE_QUENCH },
134 	{ "Redirects", ICMP_REDIRECT },
135 	{ "Echos", ICMP_ECHO },
136 	{ "EchoReps", ICMP_ECHOREPLY },
137 	{ "Timestamps", ICMP_TIMESTAMP },
138 	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
139 	{ "AddrMasks", ICMP_ADDRESS },
140 	{ "AddrMaskReps", ICMP_ADDRESSREPLY },
141 	{ NULL, 0 }
142 };
143 
144 
145 static const struct snmp_mib snmp4_tcp_list[] = {
146 	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
147 	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
148 	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
149 	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
150 	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
151 	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
152 	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
153 	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
154 	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
155 	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
156 	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
157 	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
158 	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
159 	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
160 	SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),
161 	SNMP_MIB_SENTINEL
162 };
163 
164 static const struct snmp_mib snmp4_udp_list[] = {
165 	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
166 	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
167 	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
168 	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
169 	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
170 	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
171 	SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),
172 	SNMP_MIB_ITEM("IgnoredMulti", UDP_MIB_IGNOREDMULTI),
173 	SNMP_MIB_SENTINEL
174 };
175 
176 static const struct snmp_mib snmp4_net_list[] = {
177 	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
178 	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
179 	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
180 	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
181 	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
182 	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
183 	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
184 	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
185 	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
186 	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
187 	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
188 	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
189 	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
190 	SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
191 	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
192 	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
193 	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
194 	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
195 	SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
196 	SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
197 	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
198 	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
199 	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
200 	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
201 	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
202 	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
203 	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
204 	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
205 	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
206 	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
207 	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
208 	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
209 	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
210 	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
211 	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
212 	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
213 	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
214 	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
215 	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
216 	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
217 	SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),
218 	SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),
219 	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
220 	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
221 	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
222 	SNMP_MIB_ITEM("TCPBacklogCoalesce", LINUX_MIB_TCPBACKLOGCOALESCE),
223 	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
224 	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
225 	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
226 	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
227 	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
228 	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
229 	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
230 	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
231 	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
232 	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
233 	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
234 	SNMP_MIB_ITEM("TCPMemoryPressuresChrono", LINUX_MIB_TCPMEMORYPRESSURESCHRONO),
235 	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
236 	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
237 	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
238 	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
239 	SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
240 	SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
241 	SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE),
242 	SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
243 	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
244 	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
245 	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
246 	SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),
247 	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
248 	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
249 	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
250 	SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
251 	SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
252 	SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
253 	SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
254 	SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
255 	SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
256 	SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
257 	SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
258 	SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
259 	SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
260 	SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
261 	SNMP_MIB_ITEM("TCPFastOpenActiveFail", LINUX_MIB_TCPFASTOPENACTIVEFAIL),
262 	SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
263 	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
264 	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
265 	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
266 	SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),
267 	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
268 	SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),
269 	SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),
270 	SNMP_MIB_ITEM("TCPFromZeroWindowAdv", LINUX_MIB_TCPFROMZEROWINDOWADV),
271 	SNMP_MIB_ITEM("TCPToZeroWindowAdv", LINUX_MIB_TCPTOZEROWINDOWADV),
272 	SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV),
273 	SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS),
274 	SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT),
275 	SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT),
276 	SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND),
277 	SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT),
278 	SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND),
279 	SNMP_MIB_ITEM("TCPACKSkippedSynRecv", LINUX_MIB_TCPACKSKIPPEDSYNRECV),
280 	SNMP_MIB_ITEM("TCPACKSkippedPAWS", LINUX_MIB_TCPACKSKIPPEDPAWS),
281 	SNMP_MIB_ITEM("TCPACKSkippedSeq", LINUX_MIB_TCPACKSKIPPEDSEQ),
282 	SNMP_MIB_ITEM("TCPACKSkippedFinWait2", LINUX_MIB_TCPACKSKIPPEDFINWAIT2),
283 	SNMP_MIB_ITEM("TCPACKSkippedTimeWait", LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),
284 	SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
285 	SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
286 	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
287 	SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
288 	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
289 	SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
290 	SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),
291 	SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),
292 	SNMP_MIB_ITEM("TCPZeroWindowDrop", LINUX_MIB_TCPZEROWINDOWDROP),
293 	SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),
294 	SNMP_MIB_SENTINEL
295 };
296 
297 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
298 			     unsigned short *type, int count)
299 {
300 	int j;
301 
302 	if (count) {
303 		seq_puts(seq, "\nIcmpMsg:");
304 		for (j = 0; j < count; ++j)
305 			seq_printf(seq, " %sType%u",
306 				type[j] & 0x100 ? "Out" : "In",
307 				type[j] & 0xff);
308 		seq_puts(seq, "\nIcmpMsg:");
309 		for (j = 0; j < count; ++j)
310 			seq_printf(seq, " %lu", vals[j]);
311 	}
312 }
313 
314 static void icmpmsg_put(struct seq_file *seq)
315 {
316 #define PERLINE	16
317 
318 	int i, count;
319 	unsigned short type[PERLINE];
320 	unsigned long vals[PERLINE], val;
321 	struct net *net = seq->private;
322 
323 	count = 0;
324 	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
325 		val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
326 		if (val) {
327 			type[count] = i;
328 			vals[count++] = val;
329 		}
330 		if (count == PERLINE) {
331 			icmpmsg_put_line(seq, vals, type, count);
332 			count = 0;
333 		}
334 	}
335 	icmpmsg_put_line(seq, vals, type, count);
336 
337 #undef PERLINE
338 }
339 
340 static void icmp_put(struct seq_file *seq)
341 {
342 	int i;
343 	struct net *net = seq->private;
344 	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
345 
346 	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
347 	for (i = 0; icmpmibmap[i].name; i++)
348 		seq_printf(seq, " In%s", icmpmibmap[i].name);
349 	seq_puts(seq, " OutMsgs OutErrors");
350 	for (i = 0; icmpmibmap[i].name; i++)
351 		seq_printf(seq, " Out%s", icmpmibmap[i].name);
352 	seq_printf(seq, "\nIcmp: %lu %lu %lu",
353 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INMSGS),
354 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INERRORS),
355 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));
356 	for (i = 0; icmpmibmap[i].name; i++)
357 		seq_printf(seq, " %lu",
358 			   atomic_long_read(ptr + icmpmibmap[i].index));
359 	seq_printf(seq, " %lu %lu",
360 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
361 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
362 	for (i = 0; icmpmibmap[i].name; i++)
363 		seq_printf(seq, " %lu",
364 			   atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
365 }
366 
367 /*
368  *	Called from the PROCfs module. This outputs /proc/net/snmp.
369  */
370 static int snmp_seq_show_ipstats(struct seq_file *seq, void *v)
371 {
372 	struct net *net = seq->private;
373 	u64 buff64[IPSTATS_MIB_MAX];
374 	int i;
375 
376 	memset(buff64, 0, IPSTATS_MIB_MAX * sizeof(u64));
377 
378 	seq_puts(seq, "Ip: Forwarding DefaultTTL");
379 	for (i = 0; snmp4_ipstats_list[i].name; i++)
380 		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
381 
382 	seq_printf(seq, "\nIp: %d %d",
383 		   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
384 		   net->ipv4.sysctl_ip_default_ttl);
385 
386 	BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
387 	snmp_get_cpu_field64_batch(buff64, snmp4_ipstats_list,
388 				   net->mib.ip_statistics,
389 				   offsetof(struct ipstats_mib, syncp));
390 	for (i = 0; snmp4_ipstats_list[i].name; i++)
391 		seq_printf(seq, " %llu", buff64[i]);
392 
393 	return 0;
394 }
395 
396 static int snmp_seq_show_tcp_udp(struct seq_file *seq, void *v)
397 {
398 	unsigned long buff[TCPUDP_MIB_MAX];
399 	struct net *net = seq->private;
400 	int i;
401 
402 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
403 
404 	seq_puts(seq, "\nTcp:");
405 	for (i = 0; snmp4_tcp_list[i].name; i++)
406 		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
407 
408 	seq_puts(seq, "\nTcp:");
409 	snmp_get_cpu_field_batch(buff, snmp4_tcp_list,
410 				 net->mib.tcp_statistics);
411 	for (i = 0; snmp4_tcp_list[i].name; i++) {
412 		/* MaxConn field is signed, RFC 2012 */
413 		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
414 			seq_printf(seq, " %ld", buff[i]);
415 		else
416 			seq_printf(seq, " %lu", buff[i]);
417 	}
418 
419 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
420 
421 	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
422 				 net->mib.udp_statistics);
423 	seq_puts(seq, "\nUdp:");
424 	for (i = 0; snmp4_udp_list[i].name; i++)
425 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
426 	seq_puts(seq, "\nUdp:");
427 	for (i = 0; snmp4_udp_list[i].name; i++)
428 		seq_printf(seq, " %lu", buff[i]);
429 
430 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
431 
432 	/* the UDP and UDP-Lite MIBs are the same */
433 	seq_puts(seq, "\nUdpLite:");
434 	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
435 				 net->mib.udplite_statistics);
436 	for (i = 0; snmp4_udp_list[i].name; i++)
437 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
438 	seq_puts(seq, "\nUdpLite:");
439 	for (i = 0; snmp4_udp_list[i].name; i++)
440 		seq_printf(seq, " %lu", buff[i]);
441 
442 	seq_putc(seq, '\n');
443 	return 0;
444 }
445 
446 static int snmp_seq_show(struct seq_file *seq, void *v)
447 {
448 	snmp_seq_show_ipstats(seq, v);
449 
450 	icmp_put(seq);	/* RFC 2011 compatibility */
451 	icmpmsg_put(seq);
452 
453 	snmp_seq_show_tcp_udp(seq, v);
454 
455 	return 0;
456 }
457 
458 /*
459  *	Output /proc/net/netstat
460  */
461 static int netstat_seq_show(struct seq_file *seq, void *v)
462 {
463 	int i;
464 	struct net *net = seq->private;
465 
466 	seq_puts(seq, "TcpExt:");
467 	for (i = 0; snmp4_net_list[i].name; i++)
468 		seq_printf(seq, " %s", snmp4_net_list[i].name);
469 
470 	seq_puts(seq, "\nTcpExt:");
471 	for (i = 0; snmp4_net_list[i].name; i++)
472 		seq_printf(seq, " %lu",
473 			   snmp_fold_field(net->mib.net_statistics,
474 					   snmp4_net_list[i].entry));
475 
476 	seq_puts(seq, "\nIpExt:");
477 	for (i = 0; snmp4_ipextstats_list[i].name; i++)
478 		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
479 
480 	seq_puts(seq, "\nIpExt:");
481 	for (i = 0; snmp4_ipextstats_list[i].name; i++)
482 		seq_printf(seq, " %llu",
483 			   snmp_fold_field64(net->mib.ip_statistics,
484 					     snmp4_ipextstats_list[i].entry,
485 					     offsetof(struct ipstats_mib, syncp)));
486 
487 	seq_putc(seq, '\n');
488 	return 0;
489 }
490 
491 static __net_init int ip_proc_init_net(struct net *net)
492 {
493 	if (!proc_create_net_single("sockstat", 0444, net->proc_net,
494 			sockstat_seq_show, NULL))
495 		goto out_sockstat;
496 	if (!proc_create_net_single("netstat", 0444, net->proc_net,
497 			netstat_seq_show, NULL))
498 		goto out_netstat;
499 	if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
500 			NULL))
501 		goto out_snmp;
502 
503 	return 0;
504 
505 out_snmp:
506 	remove_proc_entry("netstat", net->proc_net);
507 out_netstat:
508 	remove_proc_entry("sockstat", net->proc_net);
509 out_sockstat:
510 	return -ENOMEM;
511 }
512 
513 static __net_exit void ip_proc_exit_net(struct net *net)
514 {
515 	remove_proc_entry("snmp", net->proc_net);
516 	remove_proc_entry("netstat", net->proc_net);
517 	remove_proc_entry("sockstat", net->proc_net);
518 }
519 
520 static __net_initdata struct pernet_operations ip_proc_ops = {
521 	.init = ip_proc_init_net,
522 	.exit = ip_proc_exit_net,
523 };
524 
525 int __init ip_misc_proc_init(void)
526 {
527 	return register_pernet_subsys(&ip_proc_ops);
528 }
529