xref: /openbmc/linux/net/ipv4/proc.c (revision b830f94f)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * INET		An implementation of the TCP/IP protocol suite for the LINUX
4  *		operating system.  INET is implemented using the  BSD Socket
5  *		interface as the means of communication with the user level.
6  *
7  *		This file implements the various access functions for the
8  *		PROC file system.  It is mainly used for debugging and
9  *		statistics.
10  *
11  * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12  *		Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
13  *		Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
14  *		Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
15  *
16  * Fixes:
17  *		Alan Cox	:	UDP sockets show the rxqueue/txqueue
18  *					using hint flag for the netinfo.
19  *	Pauline Middelink	:	identd support
20  *		Alan Cox	:	Make /proc safer.
21  *	Erik Schoenfelder	:	/proc/net/snmp
22  *		Alan Cox	:	Handle dead sockets properly.
23  *	Gerhard Koerting	:	Show both timers
24  *		Alan Cox	:	Allow inode to be NULL (kernel socket)
25  *	Andi Kleen		:	Add support for open_requests and
26  *					split functions for more readibility.
27  *	Andi Kleen		:	Add support for /proc/net/netstat
28  *	Arnaldo C. Melo		:	Convert to seq_file
29  */
30 #include <linux/types.h>
31 #include <net/net_namespace.h>
32 #include <net/icmp.h>
33 #include <net/protocol.h>
34 #include <net/tcp.h>
35 #include <net/udp.h>
36 #include <net/udplite.h>
37 #include <linux/bottom_half.h>
38 #include <linux/inetdevice.h>
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <linux/export.h>
42 #include <net/sock.h>
43 #include <net/raw.h>
44 
45 #define TCPUDP_MIB_MAX max_t(u32, UDP_MIB_MAX, TCP_MIB_MAX)
46 
47 /*
48  *	Report socket allocation statistics [mea@utu.fi]
49  */
50 static int sockstat_seq_show(struct seq_file *seq, void *v)
51 {
52 	struct net *net = seq->private;
53 	int orphans, sockets;
54 
55 	orphans = percpu_counter_sum_positive(&tcp_orphan_count);
56 	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
57 
58 	socket_seq_show(seq);
59 	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
60 		   sock_prot_inuse_get(net, &tcp_prot), orphans,
61 		   atomic_read(&net->ipv4.tcp_death_row.tw_count), sockets,
62 		   proto_memory_allocated(&tcp_prot));
63 	seq_printf(seq, "UDP: inuse %d mem %ld\n",
64 		   sock_prot_inuse_get(net, &udp_prot),
65 		   proto_memory_allocated(&udp_prot));
66 	seq_printf(seq, "UDPLITE: inuse %d\n",
67 		   sock_prot_inuse_get(net, &udplite_prot));
68 	seq_printf(seq, "RAW: inuse %d\n",
69 		   sock_prot_inuse_get(net, &raw_prot));
70 	seq_printf(seq,  "FRAG: inuse %u memory %lu\n",
71 		   atomic_read(&net->ipv4.fqdir->rhashtable.nelems),
72 		   frag_mem_limit(net->ipv4.fqdir));
73 	return 0;
74 }
75 
76 /* snmp items */
77 static const struct snmp_mib snmp4_ipstats_list[] = {
78 	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
79 	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
80 	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
81 	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
82 	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
83 	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
84 	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
85 	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
86 	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
87 	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
88 	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
89 	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
90 	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
91 	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
92 	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
93 	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
94 	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
95 	SNMP_MIB_SENTINEL
96 };
97 
98 /* Following items are displayed in /proc/net/netstat */
99 static const struct snmp_mib snmp4_ipextstats_list[] = {
100 	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
101 	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
102 	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
103 	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
104 	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
105 	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
106 	SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
107 	SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
108 	SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
109 	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
110 	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
111 	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
112 	/* Non RFC4293 fields */
113 	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
114 	SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
115 	SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
116 	SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
117 	SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),
118 	SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),
119 	SNMP_MIB_SENTINEL
120 };
121 
122 static const struct {
123 	const char *name;
124 	int index;
125 } icmpmibmap[] = {
126 	{ "DestUnreachs", ICMP_DEST_UNREACH },
127 	{ "TimeExcds", ICMP_TIME_EXCEEDED },
128 	{ "ParmProbs", ICMP_PARAMETERPROB },
129 	{ "SrcQuenchs", ICMP_SOURCE_QUENCH },
130 	{ "Redirects", ICMP_REDIRECT },
131 	{ "Echos", ICMP_ECHO },
132 	{ "EchoReps", ICMP_ECHOREPLY },
133 	{ "Timestamps", ICMP_TIMESTAMP },
134 	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
135 	{ "AddrMasks", ICMP_ADDRESS },
136 	{ "AddrMaskReps", ICMP_ADDRESSREPLY },
137 	{ NULL, 0 }
138 };
139 
140 
141 static const struct snmp_mib snmp4_tcp_list[] = {
142 	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
143 	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
144 	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
145 	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
146 	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
147 	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
148 	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
149 	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
150 	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
151 	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
152 	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
153 	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
154 	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
155 	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
156 	SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),
157 	SNMP_MIB_SENTINEL
158 };
159 
160 static const struct snmp_mib snmp4_udp_list[] = {
161 	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
162 	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
163 	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
164 	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
165 	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
166 	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
167 	SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),
168 	SNMP_MIB_ITEM("IgnoredMulti", UDP_MIB_IGNOREDMULTI),
169 	SNMP_MIB_SENTINEL
170 };
171 
172 static const struct snmp_mib snmp4_net_list[] = {
173 	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
174 	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
175 	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
176 	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
177 	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
178 	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
179 	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
180 	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
181 	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
182 	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
183 	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
184 	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
185 	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
186 	SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
187 	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
188 	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
189 	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
190 	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
191 	SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
192 	SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
193 	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
194 	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
195 	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
196 	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
197 	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
198 	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
199 	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
200 	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
201 	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
202 	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
203 	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
204 	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
205 	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
206 	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
207 	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
208 	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
209 	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
210 	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
211 	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
212 	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
213 	SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),
214 	SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),
215 	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
216 	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
217 	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
218 	SNMP_MIB_ITEM("TCPBacklogCoalesce", LINUX_MIB_TCPBACKLOGCOALESCE),
219 	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
220 	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
221 	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
222 	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
223 	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
224 	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
225 	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
226 	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
227 	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
228 	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
229 	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
230 	SNMP_MIB_ITEM("TCPMemoryPressuresChrono", LINUX_MIB_TCPMEMORYPRESSURESCHRONO),
231 	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
232 	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
233 	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
234 	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
235 	SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
236 	SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
237 	SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE),
238 	SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
239 	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
240 	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
241 	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
242 	SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),
243 	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
244 	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
245 	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
246 	SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
247 	SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
248 	SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
249 	SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
250 	SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
251 	SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
252 	SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
253 	SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
254 	SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
255 	SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
256 	SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
257 	SNMP_MIB_ITEM("TCPFastOpenActiveFail", LINUX_MIB_TCPFASTOPENACTIVEFAIL),
258 	SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
259 	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
260 	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
261 	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
262 	SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),
263 	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
264 	SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),
265 	SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),
266 	SNMP_MIB_ITEM("TCPFromZeroWindowAdv", LINUX_MIB_TCPFROMZEROWINDOWADV),
267 	SNMP_MIB_ITEM("TCPToZeroWindowAdv", LINUX_MIB_TCPTOZEROWINDOWADV),
268 	SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV),
269 	SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS),
270 	SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT),
271 	SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT),
272 	SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND),
273 	SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT),
274 	SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND),
275 	SNMP_MIB_ITEM("TCPACKSkippedSynRecv", LINUX_MIB_TCPACKSKIPPEDSYNRECV),
276 	SNMP_MIB_ITEM("TCPACKSkippedPAWS", LINUX_MIB_TCPACKSKIPPEDPAWS),
277 	SNMP_MIB_ITEM("TCPACKSkippedSeq", LINUX_MIB_TCPACKSKIPPEDSEQ),
278 	SNMP_MIB_ITEM("TCPACKSkippedFinWait2", LINUX_MIB_TCPACKSKIPPEDFINWAIT2),
279 	SNMP_MIB_ITEM("TCPACKSkippedTimeWait", LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),
280 	SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
281 	SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
282 	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
283 	SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
284 	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
285 	SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
286 	SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),
287 	SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),
288 	SNMP_MIB_ITEM("TCPZeroWindowDrop", LINUX_MIB_TCPZEROWINDOWDROP),
289 	SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),
290 	SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),
291 	SNMP_MIB_ITEM("TCPFastOpenPassiveAltKey", LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),
292 	SNMP_MIB_SENTINEL
293 };
294 
295 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
296 			     unsigned short *type, int count)
297 {
298 	int j;
299 
300 	if (count) {
301 		seq_puts(seq, "\nIcmpMsg:");
302 		for (j = 0; j < count; ++j)
303 			seq_printf(seq, " %sType%u",
304 				type[j] & 0x100 ? "Out" : "In",
305 				type[j] & 0xff);
306 		seq_puts(seq, "\nIcmpMsg:");
307 		for (j = 0; j < count; ++j)
308 			seq_printf(seq, " %lu", vals[j]);
309 	}
310 }
311 
312 static void icmpmsg_put(struct seq_file *seq)
313 {
314 #define PERLINE	16
315 
316 	int i, count;
317 	unsigned short type[PERLINE];
318 	unsigned long vals[PERLINE], val;
319 	struct net *net = seq->private;
320 
321 	count = 0;
322 	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
323 		val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
324 		if (val) {
325 			type[count] = i;
326 			vals[count++] = val;
327 		}
328 		if (count == PERLINE) {
329 			icmpmsg_put_line(seq, vals, type, count);
330 			count = 0;
331 		}
332 	}
333 	icmpmsg_put_line(seq, vals, type, count);
334 
335 #undef PERLINE
336 }
337 
338 static void icmp_put(struct seq_file *seq)
339 {
340 	int i;
341 	struct net *net = seq->private;
342 	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
343 
344 	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
345 	for (i = 0; icmpmibmap[i].name; i++)
346 		seq_printf(seq, " In%s", icmpmibmap[i].name);
347 	seq_puts(seq, " OutMsgs OutErrors");
348 	for (i = 0; icmpmibmap[i].name; i++)
349 		seq_printf(seq, " Out%s", icmpmibmap[i].name);
350 	seq_printf(seq, "\nIcmp: %lu %lu %lu",
351 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INMSGS),
352 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INERRORS),
353 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));
354 	for (i = 0; icmpmibmap[i].name; i++)
355 		seq_printf(seq, " %lu",
356 			   atomic_long_read(ptr + icmpmibmap[i].index));
357 	seq_printf(seq, " %lu %lu",
358 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
359 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
360 	for (i = 0; icmpmibmap[i].name; i++)
361 		seq_printf(seq, " %lu",
362 			   atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
363 }
364 
365 /*
366  *	Called from the PROCfs module. This outputs /proc/net/snmp.
367  */
368 static int snmp_seq_show_ipstats(struct seq_file *seq, void *v)
369 {
370 	struct net *net = seq->private;
371 	u64 buff64[IPSTATS_MIB_MAX];
372 	int i;
373 
374 	memset(buff64, 0, IPSTATS_MIB_MAX * sizeof(u64));
375 
376 	seq_puts(seq, "Ip: Forwarding DefaultTTL");
377 	for (i = 0; snmp4_ipstats_list[i].name; i++)
378 		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
379 
380 	seq_printf(seq, "\nIp: %d %d",
381 		   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
382 		   net->ipv4.sysctl_ip_default_ttl);
383 
384 	BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
385 	snmp_get_cpu_field64_batch(buff64, snmp4_ipstats_list,
386 				   net->mib.ip_statistics,
387 				   offsetof(struct ipstats_mib, syncp));
388 	for (i = 0; snmp4_ipstats_list[i].name; i++)
389 		seq_printf(seq, " %llu", buff64[i]);
390 
391 	return 0;
392 }
393 
394 static int snmp_seq_show_tcp_udp(struct seq_file *seq, void *v)
395 {
396 	unsigned long buff[TCPUDP_MIB_MAX];
397 	struct net *net = seq->private;
398 	int i;
399 
400 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
401 
402 	seq_puts(seq, "\nTcp:");
403 	for (i = 0; snmp4_tcp_list[i].name; i++)
404 		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
405 
406 	seq_puts(seq, "\nTcp:");
407 	snmp_get_cpu_field_batch(buff, snmp4_tcp_list,
408 				 net->mib.tcp_statistics);
409 	for (i = 0; snmp4_tcp_list[i].name; i++) {
410 		/* MaxConn field is signed, RFC 2012 */
411 		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
412 			seq_printf(seq, " %ld", buff[i]);
413 		else
414 			seq_printf(seq, " %lu", buff[i]);
415 	}
416 
417 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
418 
419 	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
420 				 net->mib.udp_statistics);
421 	seq_puts(seq, "\nUdp:");
422 	for (i = 0; snmp4_udp_list[i].name; i++)
423 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
424 	seq_puts(seq, "\nUdp:");
425 	for (i = 0; snmp4_udp_list[i].name; i++)
426 		seq_printf(seq, " %lu", buff[i]);
427 
428 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
429 
430 	/* the UDP and UDP-Lite MIBs are the same */
431 	seq_puts(seq, "\nUdpLite:");
432 	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
433 				 net->mib.udplite_statistics);
434 	for (i = 0; snmp4_udp_list[i].name; i++)
435 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
436 	seq_puts(seq, "\nUdpLite:");
437 	for (i = 0; snmp4_udp_list[i].name; i++)
438 		seq_printf(seq, " %lu", buff[i]);
439 
440 	seq_putc(seq, '\n');
441 	return 0;
442 }
443 
444 static int snmp_seq_show(struct seq_file *seq, void *v)
445 {
446 	snmp_seq_show_ipstats(seq, v);
447 
448 	icmp_put(seq);	/* RFC 2011 compatibility */
449 	icmpmsg_put(seq);
450 
451 	snmp_seq_show_tcp_udp(seq, v);
452 
453 	return 0;
454 }
455 
456 /*
457  *	Output /proc/net/netstat
458  */
459 static int netstat_seq_show(struct seq_file *seq, void *v)
460 {
461 	int i;
462 	struct net *net = seq->private;
463 
464 	seq_puts(seq, "TcpExt:");
465 	for (i = 0; snmp4_net_list[i].name; i++)
466 		seq_printf(seq, " %s", snmp4_net_list[i].name);
467 
468 	seq_puts(seq, "\nTcpExt:");
469 	for (i = 0; snmp4_net_list[i].name; i++)
470 		seq_printf(seq, " %lu",
471 			   snmp_fold_field(net->mib.net_statistics,
472 					   snmp4_net_list[i].entry));
473 
474 	seq_puts(seq, "\nIpExt:");
475 	for (i = 0; snmp4_ipextstats_list[i].name; i++)
476 		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
477 
478 	seq_puts(seq, "\nIpExt:");
479 	for (i = 0; snmp4_ipextstats_list[i].name; i++)
480 		seq_printf(seq, " %llu",
481 			   snmp_fold_field64(net->mib.ip_statistics,
482 					     snmp4_ipextstats_list[i].entry,
483 					     offsetof(struct ipstats_mib, syncp)));
484 
485 	seq_putc(seq, '\n');
486 	return 0;
487 }
488 
489 static __net_init int ip_proc_init_net(struct net *net)
490 {
491 	if (!proc_create_net_single("sockstat", 0444, net->proc_net,
492 			sockstat_seq_show, NULL))
493 		goto out_sockstat;
494 	if (!proc_create_net_single("netstat", 0444, net->proc_net,
495 			netstat_seq_show, NULL))
496 		goto out_netstat;
497 	if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
498 			NULL))
499 		goto out_snmp;
500 
501 	return 0;
502 
503 out_snmp:
504 	remove_proc_entry("netstat", net->proc_net);
505 out_netstat:
506 	remove_proc_entry("sockstat", net->proc_net);
507 out_sockstat:
508 	return -ENOMEM;
509 }
510 
511 static __net_exit void ip_proc_exit_net(struct net *net)
512 {
513 	remove_proc_entry("snmp", net->proc_net);
514 	remove_proc_entry("netstat", net->proc_net);
515 	remove_proc_entry("sockstat", net->proc_net);
516 }
517 
518 static __net_initdata struct pernet_operations ip_proc_ops = {
519 	.init = ip_proc_init_net,
520 	.exit = ip_proc_exit_net,
521 };
522 
523 int __init ip_misc_proc_init(void)
524 {
525 	return register_pernet_subsys(&ip_proc_ops);
526 }
527