xref: /openbmc/linux/net/ipv4/proc.c (revision 56712f74)
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  */
sockstat_seq_show(struct seq_file * seq,void * v)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_OUTREQUESTS),
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_ITEM("OutTransmits", IPSTATS_MIB_OUTPKTS),
97 	SNMP_MIB_SENTINEL
98 };
99 
100 /* Following items are displayed in /proc/net/netstat */
101 static const struct snmp_mib snmp4_ipextstats_list[] = {
102 	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
103 	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
104 	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
105 	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
106 	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
107 	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
108 	SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
109 	SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
110 	SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
111 	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
112 	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
113 	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
114 	/* Non RFC4293 fields */
115 	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
116 	SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
117 	SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
118 	SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
119 	SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),
120 	SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),
121 	SNMP_MIB_SENTINEL
122 };
123 
124 static const struct {
125 	const char *name;
126 	int index;
127 } icmpmibmap[] = {
128 	{ "DestUnreachs", ICMP_DEST_UNREACH },
129 	{ "TimeExcds", ICMP_TIME_EXCEEDED },
130 	{ "ParmProbs", ICMP_PARAMETERPROB },
131 	{ "SrcQuenchs", ICMP_SOURCE_QUENCH },
132 	{ "Redirects", ICMP_REDIRECT },
133 	{ "Echos", ICMP_ECHO },
134 	{ "EchoReps", ICMP_ECHOREPLY },
135 	{ "Timestamps", ICMP_TIMESTAMP },
136 	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
137 	{ "AddrMasks", ICMP_ADDRESS },
138 	{ "AddrMaskReps", ICMP_ADDRESSREPLY },
139 	{ NULL, 0 }
140 };
141 
142 
143 static const struct snmp_mib snmp4_tcp_list[] = {
144 	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
145 	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
146 	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
147 	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
148 	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
149 	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
150 	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
151 	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
152 	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
153 	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
154 	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
155 	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
156 	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
157 	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
158 	SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),
159 	SNMP_MIB_SENTINEL
160 };
161 
162 static const struct snmp_mib snmp4_udp_list[] = {
163 	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
164 	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
165 	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
166 	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
167 	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
168 	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
169 	SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),
170 	SNMP_MIB_ITEM("IgnoredMulti", UDP_MIB_IGNOREDMULTI),
171 	SNMP_MIB_ITEM("MemErrors", UDP_MIB_MEMERRORS),
172 	SNMP_MIB_SENTINEL
173 };
174 
175 static const struct snmp_mib snmp4_net_list[] = {
176 	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
177 	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
178 	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
179 	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
180 	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
181 	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
182 	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
183 	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
184 	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
185 	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
186 	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
187 	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
188 	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
189 	SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
190 	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
191 	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
192 	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
193 	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
194 	SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
195 	SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
196 	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
197 	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
198 	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
199 	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
200 	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
201 	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
202 	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
203 	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
204 	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
205 	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
206 	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
207 	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
208 	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
209 	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
210 	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
211 	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
212 	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
213 	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
214 	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
215 	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
216 	SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),
217 	SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),
218 	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
219 	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
220 	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
221 	SNMP_MIB_ITEM("TCPBacklogCoalesce", LINUX_MIB_TCPBACKLOGCOALESCE),
222 	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
223 	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
224 	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
225 	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
226 	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
227 	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
228 	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
229 	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
230 	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
231 	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
232 	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
233 	SNMP_MIB_ITEM("TCPMemoryPressuresChrono", LINUX_MIB_TCPMEMORYPRESSURESCHRONO),
234 	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
235 	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
236 	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
237 	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
238 	SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
239 	SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
240 	SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE),
241 	SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
242 	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
243 	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
244 	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
245 	SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),
246 	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
247 	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
248 	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
249 	SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
250 	SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
251 	SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
252 	SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
253 	SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
254 	SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
255 	SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
256 	SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
257 	SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
258 	SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
259 	SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
260 	SNMP_MIB_ITEM("TCPFastOpenActiveFail", LINUX_MIB_TCPFASTOPENACTIVEFAIL),
261 	SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
262 	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
263 	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
264 	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
265 	SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),
266 	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
267 	SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),
268 	SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),
269 	SNMP_MIB_ITEM("TCPFromZeroWindowAdv", LINUX_MIB_TCPFROMZEROWINDOWADV),
270 	SNMP_MIB_ITEM("TCPToZeroWindowAdv", LINUX_MIB_TCPTOZEROWINDOWADV),
271 	SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV),
272 	SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS),
273 	SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT),
274 	SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT),
275 	SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND),
276 	SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT),
277 	SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND),
278 	SNMP_MIB_ITEM("TCPACKSkippedSynRecv", LINUX_MIB_TCPACKSKIPPEDSYNRECV),
279 	SNMP_MIB_ITEM("TCPACKSkippedPAWS", LINUX_MIB_TCPACKSKIPPEDPAWS),
280 	SNMP_MIB_ITEM("TCPACKSkippedSeq", LINUX_MIB_TCPACKSKIPPEDSEQ),
281 	SNMP_MIB_ITEM("TCPACKSkippedFinWait2", LINUX_MIB_TCPACKSKIPPEDFINWAIT2),
282 	SNMP_MIB_ITEM("TCPACKSkippedTimeWait", LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),
283 	SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
284 	SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
285 	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
286 	SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
287 	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
288 	SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
289 	SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),
290 	SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),
291 	SNMP_MIB_ITEM("TCPZeroWindowDrop", LINUX_MIB_TCPZEROWINDOWDROP),
292 	SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),
293 	SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),
294 	SNMP_MIB_ITEM("TCPFastOpenPassiveAltKey", LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),
295 	SNMP_MIB_ITEM("TcpTimeoutRehash", LINUX_MIB_TCPTIMEOUTREHASH),
296 	SNMP_MIB_ITEM("TcpDuplicateDataRehash", LINUX_MIB_TCPDUPLICATEDATAREHASH),
297 	SNMP_MIB_ITEM("TCPDSACKRecvSegs", LINUX_MIB_TCPDSACKRECVSEGS),
298 	SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),
299 	SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS),
300 	SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE),
301 	SNMP_MIB_ITEM("TCPPLBRehash", LINUX_MIB_TCPPLBREHASH),
302 	SNMP_MIB_SENTINEL
303 };
304 
icmpmsg_put_line(struct seq_file * seq,unsigned long * vals,unsigned short * type,int count)305 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
306 			     unsigned short *type, int count)
307 {
308 	int j;
309 
310 	if (count) {
311 		seq_puts(seq, "\nIcmpMsg:");
312 		for (j = 0; j < count; ++j)
313 			seq_printf(seq, " %sType%u",
314 				type[j] & 0x100 ? "Out" : "In",
315 				type[j] & 0xff);
316 		seq_puts(seq, "\nIcmpMsg:");
317 		for (j = 0; j < count; ++j)
318 			seq_printf(seq, " %lu", vals[j]);
319 	}
320 }
321 
icmpmsg_put(struct seq_file * seq)322 static void icmpmsg_put(struct seq_file *seq)
323 {
324 #define PERLINE	16
325 
326 	int i, count;
327 	unsigned short type[PERLINE];
328 	unsigned long vals[PERLINE], val;
329 	struct net *net = seq->private;
330 
331 	count = 0;
332 	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
333 		val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
334 		if (val) {
335 			type[count] = i;
336 			vals[count++] = val;
337 		}
338 		if (count == PERLINE) {
339 			icmpmsg_put_line(seq, vals, type, count);
340 			count = 0;
341 		}
342 	}
343 	icmpmsg_put_line(seq, vals, type, count);
344 
345 #undef PERLINE
346 }
347 
icmp_put(struct seq_file * seq)348 static void icmp_put(struct seq_file *seq)
349 {
350 	int i;
351 	struct net *net = seq->private;
352 	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
353 
354 	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
355 	for (i = 0; icmpmibmap[i].name; i++)
356 		seq_printf(seq, " In%s", icmpmibmap[i].name);
357 	seq_puts(seq, " OutMsgs OutErrors OutRateLimitGlobal OutRateLimitHost");
358 	for (i = 0; icmpmibmap[i].name; i++)
359 		seq_printf(seq, " Out%s", icmpmibmap[i].name);
360 	seq_printf(seq, "\nIcmp: %lu %lu %lu",
361 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INMSGS),
362 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INERRORS),
363 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));
364 	for (i = 0; icmpmibmap[i].name; i++)
365 		seq_printf(seq, " %lu",
366 			   atomic_long_read(ptr + icmpmibmap[i].index));
367 	seq_printf(seq, " %lu %lu %lu %lu",
368 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
369 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS),
370 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_RATELIMITGLOBAL),
371 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_RATELIMITHOST));
372 	for (i = 0; icmpmibmap[i].name; i++)
373 		seq_printf(seq, " %lu",
374 			   atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
375 }
376 
377 /*
378  *	Called from the PROCfs module. This outputs /proc/net/snmp.
379  */
snmp_seq_show_ipstats(struct seq_file * seq,void * v)380 static int snmp_seq_show_ipstats(struct seq_file *seq, void *v)
381 {
382 	struct net *net = seq->private;
383 	u64 buff64[IPSTATS_MIB_MAX];
384 	int i;
385 
386 	memset(buff64, 0, IPSTATS_MIB_MAX * sizeof(u64));
387 
388 	seq_puts(seq, "Ip: Forwarding DefaultTTL");
389 	for (i = 0; snmp4_ipstats_list[i].name; i++)
390 		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
391 
392 	seq_printf(seq, "\nIp: %d %d",
393 		   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
394 		   READ_ONCE(net->ipv4.sysctl_ip_default_ttl));
395 
396 	BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
397 	snmp_get_cpu_field64_batch(buff64, snmp4_ipstats_list,
398 				   net->mib.ip_statistics,
399 				   offsetof(struct ipstats_mib, syncp));
400 	for (i = 0; snmp4_ipstats_list[i].name; i++)
401 		seq_printf(seq, " %llu", buff64[i]);
402 
403 	return 0;
404 }
405 
snmp_seq_show_tcp_udp(struct seq_file * seq,void * v)406 static int snmp_seq_show_tcp_udp(struct seq_file *seq, void *v)
407 {
408 	unsigned long buff[TCPUDP_MIB_MAX];
409 	struct net *net = seq->private;
410 	int i;
411 
412 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
413 
414 	seq_puts(seq, "\nTcp:");
415 	for (i = 0; snmp4_tcp_list[i].name; i++)
416 		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
417 
418 	seq_puts(seq, "\nTcp:");
419 	snmp_get_cpu_field_batch(buff, snmp4_tcp_list,
420 				 net->mib.tcp_statistics);
421 	for (i = 0; snmp4_tcp_list[i].name; i++) {
422 		/* MaxConn field is signed, RFC 2012 */
423 		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
424 			seq_printf(seq, " %ld", buff[i]);
425 		else
426 			seq_printf(seq, " %lu", buff[i]);
427 	}
428 
429 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
430 
431 	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
432 				 net->mib.udp_statistics);
433 	seq_puts(seq, "\nUdp:");
434 	for (i = 0; snmp4_udp_list[i].name; i++)
435 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
436 	seq_puts(seq, "\nUdp:");
437 	for (i = 0; snmp4_udp_list[i].name; i++)
438 		seq_printf(seq, " %lu", buff[i]);
439 
440 	memset(buff, 0, TCPUDP_MIB_MAX * sizeof(unsigned long));
441 
442 	/* the UDP and UDP-Lite MIBs are the same */
443 	seq_puts(seq, "\nUdpLite:");
444 	snmp_get_cpu_field_batch(buff, snmp4_udp_list,
445 				 net->mib.udplite_statistics);
446 	for (i = 0; snmp4_udp_list[i].name; i++)
447 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
448 	seq_puts(seq, "\nUdpLite:");
449 	for (i = 0; snmp4_udp_list[i].name; i++)
450 		seq_printf(seq, " %lu", buff[i]);
451 
452 	seq_putc(seq, '\n');
453 	return 0;
454 }
455 
snmp_seq_show(struct seq_file * seq,void * v)456 static int snmp_seq_show(struct seq_file *seq, void *v)
457 {
458 	snmp_seq_show_ipstats(seq, v);
459 
460 	icmp_put(seq);	/* RFC 2011 compatibility */
461 	icmpmsg_put(seq);
462 
463 	snmp_seq_show_tcp_udp(seq, v);
464 
465 	return 0;
466 }
467 
468 /*
469  *	Output /proc/net/netstat
470  */
netstat_seq_show(struct seq_file * seq,void * v)471 static int netstat_seq_show(struct seq_file *seq, void *v)
472 {
473 	const int ip_cnt = ARRAY_SIZE(snmp4_ipextstats_list) - 1;
474 	const int tcp_cnt = ARRAY_SIZE(snmp4_net_list) - 1;
475 	struct net *net = seq->private;
476 	unsigned long *buff;
477 	int i;
478 
479 	seq_puts(seq, "TcpExt:");
480 	for (i = 0; i < tcp_cnt; i++)
481 		seq_printf(seq, " %s", snmp4_net_list[i].name);
482 
483 	seq_puts(seq, "\nTcpExt:");
484 	buff = kzalloc(max(tcp_cnt * sizeof(long), ip_cnt * sizeof(u64)),
485 		       GFP_KERNEL);
486 	if (buff) {
487 		snmp_get_cpu_field_batch(buff, snmp4_net_list,
488 					 net->mib.net_statistics);
489 		for (i = 0; i < tcp_cnt; i++)
490 			seq_printf(seq, " %lu", buff[i]);
491 	} else {
492 		for (i = 0; i < tcp_cnt; i++)
493 			seq_printf(seq, " %lu",
494 				   snmp_fold_field(net->mib.net_statistics,
495 						   snmp4_net_list[i].entry));
496 	}
497 	seq_puts(seq, "\nIpExt:");
498 	for (i = 0; i < ip_cnt; i++)
499 		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
500 
501 	seq_puts(seq, "\nIpExt:");
502 	if (buff) {
503 		u64 *buff64 = (u64 *)buff;
504 
505 		memset(buff64, 0, ip_cnt * sizeof(u64));
506 		snmp_get_cpu_field64_batch(buff64, snmp4_ipextstats_list,
507 					   net->mib.ip_statistics,
508 					   offsetof(struct ipstats_mib, syncp));
509 		for (i = 0; i < ip_cnt; i++)
510 			seq_printf(seq, " %llu", buff64[i]);
511 	} else {
512 		for (i = 0; i < ip_cnt; i++)
513 			seq_printf(seq, " %llu",
514 				   snmp_fold_field64(net->mib.ip_statistics,
515 						     snmp4_ipextstats_list[i].entry,
516 						     offsetof(struct ipstats_mib, syncp)));
517 	}
518 	kfree(buff);
519 	seq_putc(seq, '\n');
520 	mptcp_seq_show(seq);
521 	return 0;
522 }
523 
ip_proc_init_net(struct net * net)524 static __net_init int ip_proc_init_net(struct net *net)
525 {
526 	if (!proc_create_net_single("sockstat", 0444, net->proc_net,
527 			sockstat_seq_show, NULL))
528 		goto out_sockstat;
529 	if (!proc_create_net_single("netstat", 0444, net->proc_net,
530 			netstat_seq_show, NULL))
531 		goto out_netstat;
532 	if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
533 			NULL))
534 		goto out_snmp;
535 
536 	return 0;
537 
538 out_snmp:
539 	remove_proc_entry("netstat", net->proc_net);
540 out_netstat:
541 	remove_proc_entry("sockstat", net->proc_net);
542 out_sockstat:
543 	return -ENOMEM;
544 }
545 
ip_proc_exit_net(struct net * net)546 static __net_exit void ip_proc_exit_net(struct net *net)
547 {
548 	remove_proc_entry("snmp", net->proc_net);
549 	remove_proc_entry("netstat", net->proc_net);
550 	remove_proc_entry("sockstat", net->proc_net);
551 }
552 
553 static __net_initdata struct pernet_operations ip_proc_ops = {
554 	.init = ip_proc_init_net,
555 	.exit = ip_proc_exit_net,
556 };
557 
ip_misc_proc_init(void)558 int __init ip_misc_proc_init(void)
559 {
560 	return register_pernet_subsys(&ip_proc_ops);
561 }
562