xref: /linux/net/ipv4/proc.c (revision 98366c20a275e957416e9516db5dcb7195b4e101)
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  * Version:	$Id: proc.c,v 1.45 2001/05/16 16:45:35 davem Exp $
11  *
12  * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13  *		Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
14  *		Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
15  *		Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
16  *
17  * Fixes:
18  *		Alan Cox	:	UDP sockets show the rxqueue/txqueue
19  *					using hint flag for the netinfo.
20  *	Pauline Middelink	:	identd support
21  *		Alan Cox	:	Make /proc safer.
22  *	Erik Schoenfelder	:	/proc/net/snmp
23  *		Alan Cox	:	Handle dead sockets properly.
24  *	Gerhard Koerting	:	Show both timers
25  *		Alan Cox	:	Allow inode to be NULL (kernel socket)
26  *	Andi Kleen		:	Add support for open_requests and
27  *					split functions for more readibility.
28  *	Andi Kleen		:	Add support for /proc/net/netstat
29  *	Arnaldo C. Melo		:	Convert to seq_file
30  *
31  *		This program is free software; you can redistribute it and/or
32  *		modify it under the terms of the GNU General Public License
33  *		as published by the Free Software Foundation; either version
34  *		2 of the License, or (at your option) any later version.
35  */
36 #include <linux/types.h>
37 #include <net/net_namespace.h>
38 #include <net/icmp.h>
39 #include <net/protocol.h>
40 #include <net/tcp.h>
41 #include <net/udp.h>
42 #include <net/udplite.h>
43 #include <linux/inetdevice.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <net/sock.h>
47 #include <net/raw.h>
48 
49 static int fold_prot_inuse(struct proto *proto)
50 {
51 	int res = 0;
52 	int cpu;
53 
54 	for_each_possible_cpu(cpu)
55 		res += proto->stats[cpu].inuse;
56 
57 	return res;
58 }
59 
60 /*
61  *	Report socket allocation statistics [mea@utu.fi]
62  */
63 static int sockstat_seq_show(struct seq_file *seq, void *v)
64 {
65 	socket_seq_show(seq);
66 	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
67 		   fold_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count),
68 		   tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
69 		   atomic_read(&tcp_memory_allocated));
70 	seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_prot));
71 	seq_printf(seq, "UDPLITE: inuse %d\n", fold_prot_inuse(&udplite_prot));
72 	seq_printf(seq, "RAW: inuse %d\n", fold_prot_inuse(&raw_prot));
73 	seq_printf(seq,  "FRAG: inuse %d memory %d\n",
74 			ip_frag_nqueues(), ip_frag_mem());
75 	return 0;
76 }
77 
78 static int sockstat_seq_open(struct inode *inode, struct file *file)
79 {
80 	return single_open(file, sockstat_seq_show, NULL);
81 }
82 
83 static const struct file_operations sockstat_seq_fops = {
84 	.owner	 = THIS_MODULE,
85 	.open	 = sockstat_seq_open,
86 	.read	 = seq_read,
87 	.llseek	 = seq_lseek,
88 	.release = single_release,
89 };
90 
91 /* snmp items */
92 static const struct snmp_mib snmp4_ipstats_list[] = {
93 	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
94 	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
95 	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
96 	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
97 	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
98 	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
99 	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
100 	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
101 	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
102 	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
103 	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
104 	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
105 	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
106 	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
107 	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
108 	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
109 	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
110 	SNMP_MIB_SENTINEL
111 };
112 
113 /* Following RFC4293 items are displayed in /proc/net/netstat */
114 static const struct snmp_mib snmp4_ipextstats_list[] = {
115 	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
116 	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
117 	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
118 	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
119 	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
120 	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
121 	SNMP_MIB_SENTINEL
122 };
123 
124 static struct {
125 	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_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_SENTINEL
169 };
170 
171 static const struct snmp_mib snmp4_net_list[] = {
172 	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
173 	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
174 	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
175 	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
176 	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
177 	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
178 	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
179 	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
180 	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
181 	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
182 	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
183 	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
184 	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
185 	SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
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("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
194 	SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
195 	SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
196 	SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
197 	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
198 	SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
199 	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
200 	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
201 	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
202 	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
203 	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
204 	SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
205 	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
206 	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
207 	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
208 	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
209 	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
210 	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
211 	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
212 	SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
213 	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
214 	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
215 	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
216 	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
217 	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
218 	SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
219 	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
220 	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
221 	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
222 	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
223 	SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
224 	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
225 	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
226 	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
227 	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
228 	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
229 	SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
230 	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
231 	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
232 	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
233 	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
234 	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
235 	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
236 	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
237 	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
238 	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
239 	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
240 	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
241 	SNMP_MIB_SENTINEL
242 };
243 
244 static void icmpmsg_put(struct seq_file *seq)
245 {
246 #define PERLINE	16
247 
248 	int j, i, count;
249 	static int out[PERLINE];
250 
251 	count = 0;
252 	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
253 
254 		if (snmp_fold_field((void **) icmpmsg_statistics, i))
255 			out[count++] = i;
256 		if (count < PERLINE)
257 			continue;
258 
259 		seq_printf(seq, "\nIcmpMsg:");
260 		for (j = 0; j < PERLINE; ++j)
261 			seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
262 					i & 0xff);
263 		seq_printf(seq, "\nIcmpMsg: ");
264 		for (j = 0; j < PERLINE; ++j)
265 			seq_printf(seq, " %lu",
266 				snmp_fold_field((void **) icmpmsg_statistics,
267 				out[j]));
268 		seq_putc(seq, '\n');
269 	}
270 	if (count) {
271 		seq_printf(seq, "\nIcmpMsg:");
272 		for (j = 0; j < count; ++j)
273 			seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :
274 				"In", out[j] & 0xff);
275 		seq_printf(seq, "\nIcmpMsg:");
276 		for (j = 0; j < count; ++j)
277 			seq_printf(seq, " %lu", snmp_fold_field((void **)
278 				icmpmsg_statistics, out[j]));
279 	}
280 
281 #undef PERLINE
282 }
283 
284 static void icmp_put(struct seq_file *seq)
285 {
286 	int i;
287 
288 	seq_puts(seq, "\nIcmp: InMsgs InErrors");
289 	for (i=0; icmpmibmap[i].name != NULL; i++)
290 		seq_printf(seq, " In%s", icmpmibmap[i].name);
291 	seq_printf(seq, " OutMsgs OutErrors");
292 	for (i=0; icmpmibmap[i].name != NULL; i++)
293 		seq_printf(seq, " Out%s", icmpmibmap[i].name);
294 	seq_printf(seq, "\nIcmp: %lu %lu",
295 		snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),
296 		snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));
297 	for (i=0; icmpmibmap[i].name != NULL; i++)
298 		seq_printf(seq, " %lu",
299 			snmp_fold_field((void **) icmpmsg_statistics,
300 				icmpmibmap[i].index));
301 	seq_printf(seq, " %lu %lu",
302 		snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),
303 		snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));
304 	for (i=0; icmpmibmap[i].name != NULL; i++)
305 		seq_printf(seq, " %lu",
306 			snmp_fold_field((void **) icmpmsg_statistics,
307 				icmpmibmap[i].index | 0x100));
308 }
309 
310 /*
311  *	Called from the PROCfs module. This outputs /proc/net/snmp.
312  */
313 static int snmp_seq_show(struct seq_file *seq, void *v)
314 {
315 	int i;
316 
317 	seq_puts(seq, "Ip: Forwarding DefaultTTL");
318 
319 	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
320 		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
321 
322 	seq_printf(seq, "\nIp: %d %d",
323 		   IPV4_DEVCONF_ALL(FORWARDING) ? 1 : 2, sysctl_ip_default_ttl);
324 
325 	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
326 		seq_printf(seq, " %lu",
327 			   snmp_fold_field((void **)ip_statistics,
328 					   snmp4_ipstats_list[i].entry));
329 
330 	icmp_put(seq);	/* RFC 2011 compatibility */
331 	icmpmsg_put(seq);
332 
333 	seq_puts(seq, "\nTcp:");
334 	for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
335 		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
336 
337 	seq_puts(seq, "\nTcp:");
338 	for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
339 		/* MaxConn field is signed, RFC 2012 */
340 		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
341 			seq_printf(seq, " %ld",
342 				   snmp_fold_field((void **)tcp_statistics,
343 						   snmp4_tcp_list[i].entry));
344 		else
345 			seq_printf(seq, " %lu",
346 				   snmp_fold_field((void **)tcp_statistics,
347 						   snmp4_tcp_list[i].entry));
348 	}
349 
350 	seq_puts(seq, "\nUdp:");
351 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
352 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
353 
354 	seq_puts(seq, "\nUdp:");
355 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
356 		seq_printf(seq, " %lu",
357 			   snmp_fold_field((void **)udp_statistics,
358 					   snmp4_udp_list[i].entry));
359 
360 	/* the UDP and UDP-Lite MIBs are the same */
361 	seq_puts(seq, "\nUdpLite:");
362 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
363 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
364 
365 	seq_puts(seq, "\nUdpLite:");
366 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
367 		seq_printf(seq, " %lu",
368 			   snmp_fold_field((void **)udplite_statistics,
369 					   snmp4_udp_list[i].entry));
370 
371 	seq_putc(seq, '\n');
372 	return 0;
373 }
374 
375 static int snmp_seq_open(struct inode *inode, struct file *file)
376 {
377 	return single_open(file, snmp_seq_show, NULL);
378 }
379 
380 static const struct file_operations snmp_seq_fops = {
381 	.owner	 = THIS_MODULE,
382 	.open	 = snmp_seq_open,
383 	.read	 = seq_read,
384 	.llseek	 = seq_lseek,
385 	.release = single_release,
386 };
387 
388 
389 
390 /*
391  *	Output /proc/net/netstat
392  */
393 static int netstat_seq_show(struct seq_file *seq, void *v)
394 {
395 	int i;
396 
397 	seq_puts(seq, "TcpExt:");
398 	for (i = 0; snmp4_net_list[i].name != NULL; i++)
399 		seq_printf(seq, " %s", snmp4_net_list[i].name);
400 
401 	seq_puts(seq, "\nTcpExt:");
402 	for (i = 0; snmp4_net_list[i].name != NULL; i++)
403 		seq_printf(seq, " %lu",
404 			   snmp_fold_field((void **)net_statistics,
405 					   snmp4_net_list[i].entry));
406 
407 	seq_puts(seq, "\nIpExt:");
408 	for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
409 		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
410 
411 	seq_puts(seq, "\nIpExt:");
412 	for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
413 		seq_printf(seq, " %lu",
414 			   snmp_fold_field((void **)ip_statistics,
415 					   snmp4_ipextstats_list[i].entry));
416 
417 	seq_putc(seq, '\n');
418 	return 0;
419 }
420 
421 static int netstat_seq_open(struct inode *inode, struct file *file)
422 {
423 	return single_open(file, netstat_seq_show, NULL);
424 }
425 
426 static const struct file_operations netstat_seq_fops = {
427 	.owner	 = THIS_MODULE,
428 	.open	 = netstat_seq_open,
429 	.read	 = seq_read,
430 	.llseek	 = seq_lseek,
431 	.release = single_release,
432 };
433 
434 int __init ip_misc_proc_init(void)
435 {
436 	int rc = 0;
437 
438 	if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
439 		goto out_netstat;
440 
441 	if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
442 		goto out_snmp;
443 
444 	if (!proc_net_fops_create(&init_net, "sockstat", S_IRUGO, &sockstat_seq_fops))
445 		goto out_sockstat;
446 out:
447 	return rc;
448 out_sockstat:
449 	proc_net_remove(&init_net, "snmp");
450 out_snmp:
451 	proc_net_remove(&init_net, "netstat");
452 out_netstat:
453 	rc = -ENOMEM;
454 	goto out;
455 }
456 
457