xref: /openbmc/linux/net/ipv4/proc.c (revision 0030d7d6)
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/mptcp.h>
36  #include <net/udp.h>
37  #include <net/udplite.h>
38  #include <linux/bottom_half.h>
39  #include <linux/inetdevice.h>
40  #include <linux/proc_fs.h>
41  #include <linux/seq_file.h>
42  #include <linux/export.h>
43  #include <net/sock.h>
44  #include <net/raw.h>
45  
46  #define TCPUDP_MIB_MAX max_t(u32, UDP_MIB_MAX, TCP_MIB_MAX)
47  
48  /*
49   *	Report socket allocation statistics [mea@utu.fi]
50   */
51  static int sockstat_seq_show(struct seq_file *seq, void *v)
52  {
53  	struct net *net = seq->private;
54  	int orphans, sockets;
55  
56  	orphans = tcp_orphan_count_sum();
57  	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
58  
59  	socket_seq_show(seq);
60  	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
61  		   sock_prot_inuse_get(net, &tcp_prot), orphans,
62  		   refcount_read(&net->ipv4.tcp_death_row.tw_refcount) - 1,
63  		   sockets, proto_memory_allocated(&tcp_prot));
64  	seq_printf(seq, "UDP: inuse %d mem %ld\n",
65  		   sock_prot_inuse_get(net, &udp_prot),
66  		   proto_memory_allocated(&udp_prot));
67  	seq_printf(seq, "UDPLITE: inuse %d\n",
68  		   sock_prot_inuse_get(net, &udplite_prot));
69  	seq_printf(seq, "RAW: inuse %d\n",
70  		   sock_prot_inuse_get(net, &raw_prot));
71  	seq_printf(seq,  "FRAG: inuse %u memory %lu\n",
72  		   atomic_read(&net->ipv4.fqdir->rhashtable.nelems),
73  		   frag_mem_limit(net->ipv4.fqdir));
74  	return 0;
75  }
76  
77  /* snmp items */
78  static const struct snmp_mib snmp4_ipstats_list[] = {
79  	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
80  	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
81  	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
82  	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
83  	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
84  	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
85  	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
86  	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
87  	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
88  	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
89  	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
90  	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
91  	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
92  	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
93  	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
94  	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
95  	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
96  	SNMP_MIB_SENTINEL
97  };
98  
99  /* Following items are displayed in /proc/net/netstat */
100  static const struct snmp_mib snmp4_ipextstats_list[] = {
101  	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
102  	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
103  	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
104  	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
105  	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
106  	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
107  	SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
108  	SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
109  	SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
110  	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
111  	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
112  	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
113  	/* Non RFC4293 fields */
114  	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
115  	SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
116  	SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
117  	SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
118  	SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),
119  	SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),
120  	SNMP_MIB_SENTINEL
121  };
122  
123  static const struct {
124  	const char *name;
125  	int index;
126  } icmpmibmap[] = {
127  	{ "DestUnreachs", ICMP_DEST_UNREACH },
128  	{ "TimeExcds", ICMP_TIME_EXCEEDED },
129  	{ "ParmProbs", ICMP_PARAMETERPROB },
130  	{ "SrcQuenchs", ICMP_SOURCE_QUENCH },
131  	{ "Redirects", ICMP_REDIRECT },
132  	{ "Echos", ICMP_ECHO },
133  	{ "EchoReps", ICMP_ECHOREPLY },
134  	{ "Timestamps", ICMP_TIMESTAMP },
135  	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
136  	{ "AddrMasks", ICMP_ADDRESS },
137  	{ "AddrMaskReps", ICMP_ADDRESSREPLY },
138  	{ NULL, 0 }
139  };
140  
141  
142  static const struct snmp_mib snmp4_tcp_list[] = {
143  	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
144  	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
145  	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
146  	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
147  	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
148  	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
149  	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
150  	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
151  	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
152  	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
153  	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
154  	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
155  	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
156  	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
157  	SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),
158  	SNMP_MIB_SENTINEL
159  };
160  
161  static const struct snmp_mib snmp4_udp_list[] = {
162  	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
163  	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
164  	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
165  	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
166  	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
167  	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
168  	SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),
169  	SNMP_MIB_ITEM("IgnoredMulti", UDP_MIB_IGNOREDMULTI),
170  	SNMP_MIB_ITEM("MemErrors", UDP_MIB_MEMERRORS),
171  	SNMP_MIB_SENTINEL
172  };
173  
174  static const struct snmp_mib snmp4_net_list[] = {
175  	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
176  	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
177  	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
178  	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
179  	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
180  	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
181  	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
182  	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
183  	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
184  	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
185  	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
186  	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
187  	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
188  	SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
189  	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
190  	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
191  	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
192  	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
193  	SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
194  	SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
195  	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
196  	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
197  	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
198  	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
199  	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
200  	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
201  	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
202  	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
203  	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
204  	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
205  	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
206  	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
207  	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
208  	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
209  	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
210  	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
211  	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
212  	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
213  	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
214  	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
215  	SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),
216  	SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),
217  	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
218  	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
219  	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
220  	SNMP_MIB_ITEM("TCPBacklogCoalesce", LINUX_MIB_TCPBACKLOGCOALESCE),
221  	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
222  	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
223  	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
224  	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
225  	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
226  	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
227  	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
228  	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
229  	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
230  	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
231  	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
232  	SNMP_MIB_ITEM("TCPMemoryPressuresChrono", LINUX_MIB_TCPMEMORYPRESSURESCHRONO),
233  	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
234  	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
235  	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
236  	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
237  	SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
238  	SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
239  	SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE),
240  	SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
241  	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
242  	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
243  	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
244  	SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),
245  	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
246  	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
247  	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
248  	SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
249  	SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
250  	SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
251  	SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
252  	SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
253  	SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
254  	SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
255  	SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
256  	SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
257  	SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
258  	SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
259  	SNMP_MIB_ITEM("TCPFastOpenActiveFail", LINUX_MIB_TCPFASTOPENACTIVEFAIL),
260  	SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
261  	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
262  	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
263  	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
264  	SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),
265  	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
266  	SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),
267  	SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),
268  	SNMP_MIB_ITEM("TCPFromZeroWindowAdv", LINUX_MIB_TCPFROMZEROWINDOWADV),
269  	SNMP_MIB_ITEM("TCPToZeroWindowAdv", LINUX_MIB_TCPTOZEROWINDOWADV),
270  	SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV),
271  	SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS),
272  	SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT),
273  	SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT),
274  	SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND),
275  	SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT),
276  	SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND),
277  	SNMP_MIB_ITEM("TCPACKSkippedSynRecv", LINUX_MIB_TCPACKSKIPPEDSYNRECV),
278  	SNMP_MIB_ITEM("TCPACKSkippedPAWS", LINUX_MIB_TCPACKSKIPPEDPAWS),
279  	SNMP_MIB_ITEM("TCPACKSkippedSeq", LINUX_MIB_TCPACKSKIPPEDSEQ),
280  	SNMP_MIB_ITEM("TCPACKSkippedFinWait2", LINUX_MIB_TCPACKSKIPPEDFINWAIT2),
281  	SNMP_MIB_ITEM("TCPACKSkippedTimeWait", LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),
282  	SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
283  	SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
284  	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
285  	SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
286  	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
287  	SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
288  	SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),
289  	SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),
290  	SNMP_MIB_ITEM("TCPZeroWindowDrop", LINUX_MIB_TCPZEROWINDOWDROP),
291  	SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),
292  	SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),
293  	SNMP_MIB_ITEM("TCPFastOpenPassiveAltKey", LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),
294  	SNMP_MIB_ITEM("TcpTimeoutRehash", LINUX_MIB_TCPTIMEOUTREHASH),
295  	SNMP_MIB_ITEM("TcpDuplicateDataRehash", LINUX_MIB_TCPDUPLICATEDATAREHASH),
296  	SNMP_MIB_ITEM("TCPDSACKRecvSegs", LINUX_MIB_TCPDSACKRECVSEGS),
297  	SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),
298  	SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS),
299  	SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE),
300  	SNMP_MIB_ITEM("TCPPLBRehash", LINUX_MIB_TCPPLBREHASH),
301  	SNMP_MIB_SENTINEL
302  };
303  
304  static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
305  			     unsigned short *type, int count)
306  {
307  	int j;
308  
309  	if (count) {
310  		seq_puts(seq, "\nIcmpMsg:");
311  		for (j = 0; j < count; ++j)
312  			seq_printf(seq, " %sType%u",
313  				type[j] & 0x100 ? "Out" : "In",
314  				type[j] & 0xff);
315  		seq_puts(seq, "\nIcmpMsg:");
316  		for (j = 0; j < count; ++j)
317  			seq_printf(seq, " %lu", vals[j]);
318  	}
319  }
320  
321  static void icmpmsg_put(struct seq_file *seq)
322  {
323  #define PERLINE	16
324  
325  	int i, count;
326  	unsigned short type[PERLINE];
327  	unsigned long vals[PERLINE], val;
328  	struct net *net = seq->private;
329  
330  	count = 0;
331  	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
332  		val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
333  		if (val) {
334  			type[count] = i;
335  			vals[count++] = val;
336  		}
337  		if (count == PERLINE) {
338  			icmpmsg_put_line(seq, vals, type, count);
339  			count = 0;
340  		}
341  	}
342  	icmpmsg_put_line(seq, vals, type, count);
343  
344  #undef PERLINE
345  }
346  
347  static void icmp_put(struct seq_file *seq)
348  {
349  	int i;
350  	struct net *net = seq->private;
351  	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
352  
353  	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
354  	for (i = 0; icmpmibmap[i].name; i++)
355  		seq_printf(seq, " In%s", icmpmibmap[i].name);
356  	seq_puts(seq, " OutMsgs OutErrors");
357  	for (i = 0; icmpmibmap[i].name; i++)
358  		seq_printf(seq, " Out%s", icmpmibmap[i].name);
359  	seq_printf(seq, "\nIcmp: %lu %lu %lu",
360  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INMSGS),
361  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INERRORS),
362  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));
363  	for (i = 0; icmpmibmap[i].name; i++)
364  		seq_printf(seq, " %lu",
365  			   atomic_long_read(ptr + icmpmibmap[i].index));
366  	seq_printf(seq, " %lu %lu",
367  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
368  		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
369  	for (i = 0; icmpmibmap[i].name; i++)
370  		seq_printf(seq, " %lu",
371  			   atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
372  }
373  
374  /*
375   *	Called from the PROCfs module. This outputs /proc/net/snmp.
376   */
377  static int snmp_seq_show_ipstats(struct seq_file *seq, void *v)
378  {
379  	struct net *net = seq->private;
380  	u64 buff64[IPSTATS_MIB_MAX];
381  	int i;
382  
383  	memset(buff64, 0, IPSTATS_MIB_MAX * sizeof(u64));
384  
385  	seq_puts(seq, "Ip: Forwarding DefaultTTL");
386  	for (i = 0; snmp4_ipstats_list[i].name; i++)
387  		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
388  
389  	seq_printf(seq, "\nIp: %d %d",
390  		   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
391  		   READ_ONCE(net->ipv4.sysctl_ip_default_ttl));
392  
393  	BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
394  	snmp_get_cpu_field64_batch(buff64, snmp4_ipstats_list,
395  				   net->mib.ip_statistics,
396  				   offsetof(struct ipstats_mib, syncp));
397  	for (i = 0; snmp4_ipstats_list[i].name; i++)
398  		seq_printf(seq, " %llu", buff64[i]);
399  
400  	return 0;
401  }
402  
403  static int snmp_seq_show_tcp_udp(struct seq_file *seq, void *v)
404  {
405  	unsigned long buff[TCPUDP_MIB_MAX];
406  	struct net *net = seq->private;
407  	int i;
408  
409  	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
410  
411  	seq_puts(seq, "\nTcp:");
412  	for (i = 0; snmp4_tcp_list[i].name; i++)
413  		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
414  
415  	seq_puts(seq, "\nTcp:");
416  	snmp_get_cpu_field_batch(buff, snmp4_tcp_list,
417  				 net->mib.tcp_statistics);
418  	for (i = 0; snmp4_tcp_list[i].name; i++) {
419  		/* MaxConn field is signed, RFC 2012 */
420  		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
421  			seq_printf(seq, " %ld", buff[i]);
422  		else
423  			seq_printf(seq, " %lu", buff[i]);
424  	}
425  
426  	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
427  
428  	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
429  				 net->mib.udp_statistics);
430  	seq_puts(seq, "\nUdp:");
431  	for (i = 0; snmp4_udp_list[i].name; i++)
432  		seq_printf(seq, " %s", snmp4_udp_list[i].name);
433  	seq_puts(seq, "\nUdp:");
434  	for (i = 0; snmp4_udp_list[i].name; i++)
435  		seq_printf(seq, " %lu", buff[i]);
436  
437  	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
438  
439  	/* the UDP and UDP-Lite MIBs are the same */
440  	seq_puts(seq, "\nUdpLite:");
441  	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
442  				 net->mib.udplite_statistics);
443  	for (i = 0; snmp4_udp_list[i].name; i++)
444  		seq_printf(seq, " %s", snmp4_udp_list[i].name);
445  	seq_puts(seq, "\nUdpLite:");
446  	for (i = 0; snmp4_udp_list[i].name; i++)
447  		seq_printf(seq, " %lu", buff[i]);
448  
449  	seq_putc(seq, '\n');
450  	return 0;
451  }
452  
453  static int snmp_seq_show(struct seq_file *seq, void *v)
454  {
455  	snmp_seq_show_ipstats(seq, v);
456  
457  	icmp_put(seq);	/* RFC 2011 compatibility */
458  	icmpmsg_put(seq);
459  
460  	snmp_seq_show_tcp_udp(seq, v);
461  
462  	return 0;
463  }
464  
465  /*
466   *	Output /proc/net/netstat
467   */
468  static int netstat_seq_show(struct seq_file *seq, void *v)
469  {
470  	const int ip_cnt = ARRAY_SIZE(snmp4_ipextstats_list) - 1;
471  	const int tcp_cnt = ARRAY_SIZE(snmp4_net_list) - 1;
472  	struct net *net = seq->private;
473  	unsigned long *buff;
474  	int i;
475  
476  	seq_puts(seq, "TcpExt:");
477  	for (i = 0; i < tcp_cnt; i++)
478  		seq_printf(seq, " %s", snmp4_net_list[i].name);
479  
480  	seq_puts(seq, "\nTcpExt:");
481  	buff = kzalloc(max(tcp_cnt * sizeof(long), ip_cnt * sizeof(u64)),
482  		       GFP_KERNEL);
483  	if (buff) {
484  		snmp_get_cpu_field_batch(buff, snmp4_net_list,
485  					 net->mib.net_statistics);
486  		for (i = 0; i < tcp_cnt; i++)
487  			seq_printf(seq, " %lu", buff[i]);
488  	} else {
489  		for (i = 0; i < tcp_cnt; i++)
490  			seq_printf(seq, " %lu",
491  				   snmp_fold_field(net->mib.net_statistics,
492  						   snmp4_net_list[i].entry));
493  	}
494  	seq_puts(seq, "\nIpExt:");
495  	for (i = 0; i < ip_cnt; i++)
496  		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
497  
498  	seq_puts(seq, "\nIpExt:");
499  	if (buff) {
500  		u64 *buff64 = (u64 *)buff;
501  
502  		memset(buff64, 0, ip_cnt * sizeof(u64));
503  		snmp_get_cpu_field64_batch(buff64, snmp4_ipextstats_list,
504  					   net->mib.ip_statistics,
505  					   offsetof(struct ipstats_mib, syncp));
506  		for (i = 0; i < ip_cnt; i++)
507  			seq_printf(seq, " %llu", buff64[i]);
508  	} else {
509  		for (i = 0; i < ip_cnt; i++)
510  			seq_printf(seq, " %llu",
511  				   snmp_fold_field64(net->mib.ip_statistics,
512  						     snmp4_ipextstats_list[i].entry,
513  						     offsetof(struct ipstats_mib, syncp)));
514  	}
515  	kfree(buff);
516  	seq_putc(seq, '\n');
517  	mptcp_seq_show(seq);
518  	return 0;
519  }
520  
521  static __net_init int ip_proc_init_net(struct net *net)
522  {
523  	if (!proc_create_net_single("sockstat", 0444, net->proc_net,
524  			sockstat_seq_show, NULL))
525  		goto out_sockstat;
526  	if (!proc_create_net_single("netstat", 0444, net->proc_net,
527  			netstat_seq_show, NULL))
528  		goto out_netstat;
529  	if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
530  			NULL))
531  		goto out_snmp;
532  
533  	return 0;
534  
535  out_snmp:
536  	remove_proc_entry("netstat", net->proc_net);
537  out_netstat:
538  	remove_proc_entry("sockstat", net->proc_net);
539  out_sockstat:
540  	return -ENOMEM;
541  }
542  
543  static __net_exit void ip_proc_exit_net(struct net *net)
544  {
545  	remove_proc_entry("snmp", net->proc_net);
546  	remove_proc_entry("netstat", net->proc_net);
547  	remove_proc_entry("sockstat", net->proc_net);
548  }
549  
550  static __net_initdata struct pernet_operations ip_proc_ops = {
551  	.init = ip_proc_init_net,
552  	.exit = ip_proc_exit_net,
553  };
554  
555  int __init ip_misc_proc_init(void)
556  {
557  	return register_pernet_subsys(&ip_proc_ops);
558  }
559