xref: /openbmc/linux/net/ipv4/proc.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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/icmp.h>
38 #include <net/protocol.h>
39 #include <net/tcp.h>
40 #include <net/udp.h>
41 #include <linux/proc_fs.h>
42 #include <linux/seq_file.h>
43 #include <net/sock.h>
44 #include <net/raw.h>
45 
46 static int fold_prot_inuse(struct proto *proto)
47 {
48 	int res = 0;
49 	int cpu;
50 
51 	for (cpu = 0; cpu < NR_CPUS; cpu++)
52 		res += proto->stats[cpu].inuse;
53 
54 	return res;
55 }
56 
57 /*
58  *	Report socket allocation statistics [mea@utu.fi]
59  */
60 static int sockstat_seq_show(struct seq_file *seq, void *v)
61 {
62 	socket_seq_show(seq);
63 	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
64 		   fold_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count),
65 		   tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
66 		   atomic_read(&tcp_memory_allocated));
67 	seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_prot));
68 	seq_printf(seq, "RAW: inuse %d\n", fold_prot_inuse(&raw_prot));
69 	seq_printf(seq,  "FRAG: inuse %d memory %d\n", ip_frag_nqueues,
70 		   atomic_read(&ip_frag_mem));
71 	return 0;
72 }
73 
74 static int sockstat_seq_open(struct inode *inode, struct file *file)
75 {
76 	return single_open(file, sockstat_seq_show, NULL);
77 }
78 
79 static struct file_operations sockstat_seq_fops = {
80 	.owner	 = THIS_MODULE,
81 	.open	 = sockstat_seq_open,
82 	.read	 = seq_read,
83 	.llseek	 = seq_lseek,
84 	.release = single_release,
85 };
86 
87 static unsigned long
88 fold_field(void *mib[], int offt)
89 {
90 	unsigned long res = 0;
91 	int i;
92 
93 	for_each_cpu(i) {
94 		res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
95 		res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
96 	}
97 	return res;
98 }
99 
100 /* snmp items */
101 static struct snmp_mib snmp4_ipstats_list[] = {
102 	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
103 	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
104 	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
105 	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
106 	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
107 	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
108 	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
109 	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
110 	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
111 	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
112 	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
113 	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
114 	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
115 	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
116 	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
117 	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
118 	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
119 	SNMP_MIB_SENTINEL
120 };
121 
122 static struct snmp_mib snmp4_icmp_list[] = {
123 	SNMP_MIB_ITEM("InMsgs", ICMP_MIB_INMSGS),
124 	SNMP_MIB_ITEM("InErrors", ICMP_MIB_INERRORS),
125 	SNMP_MIB_ITEM("InDestUnreachs", ICMP_MIB_INDESTUNREACHS),
126 	SNMP_MIB_ITEM("InTimeExcds", ICMP_MIB_INTIMEEXCDS),
127 	SNMP_MIB_ITEM("InParmProbs", ICMP_MIB_INPARMPROBS),
128 	SNMP_MIB_ITEM("InSrcQuenchs", ICMP_MIB_INSRCQUENCHS),
129 	SNMP_MIB_ITEM("InRedirects", ICMP_MIB_INREDIRECTS),
130 	SNMP_MIB_ITEM("InEchos", ICMP_MIB_INECHOS),
131 	SNMP_MIB_ITEM("InEchoReps", ICMP_MIB_INECHOREPS),
132 	SNMP_MIB_ITEM("InTimestamps", ICMP_MIB_INTIMESTAMPS),
133 	SNMP_MIB_ITEM("InTimestampReps", ICMP_MIB_INTIMESTAMPREPS),
134 	SNMP_MIB_ITEM("InAddrMasks", ICMP_MIB_INADDRMASKS),
135 	SNMP_MIB_ITEM("InAddrMaskReps", ICMP_MIB_INADDRMASKREPS),
136 	SNMP_MIB_ITEM("OutMsgs", ICMP_MIB_OUTMSGS),
137 	SNMP_MIB_ITEM("OutErrors", ICMP_MIB_OUTERRORS),
138 	SNMP_MIB_ITEM("OutDestUnreachs", ICMP_MIB_OUTDESTUNREACHS),
139 	SNMP_MIB_ITEM("OutTimeExcds", ICMP_MIB_OUTTIMEEXCDS),
140 	SNMP_MIB_ITEM("OutParmProbs", ICMP_MIB_OUTPARMPROBS),
141 	SNMP_MIB_ITEM("OutSrcQuenchs", ICMP_MIB_OUTSRCQUENCHS),
142 	SNMP_MIB_ITEM("OutRedirects", ICMP_MIB_OUTREDIRECTS),
143 	SNMP_MIB_ITEM("OutEchos", ICMP_MIB_OUTECHOS),
144 	SNMP_MIB_ITEM("OutEchoReps", ICMP_MIB_OUTECHOREPS),
145 	SNMP_MIB_ITEM("OutTimestamps", ICMP_MIB_OUTTIMESTAMPS),
146 	SNMP_MIB_ITEM("OutTimestampReps", ICMP_MIB_OUTTIMESTAMPREPS),
147 	SNMP_MIB_ITEM("OutAddrMasks", ICMP_MIB_OUTADDRMASKS),
148 	SNMP_MIB_ITEM("OutAddrMaskReps", ICMP_MIB_OUTADDRMASKREPS),
149 	SNMP_MIB_SENTINEL
150 };
151 
152 static struct snmp_mib snmp4_tcp_list[] = {
153 	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
154 	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
155 	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
156 	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
157 	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
158 	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
159 	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
160 	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
161 	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
162 	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
163 	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
164 	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
165 	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
166 	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
167 	SNMP_MIB_SENTINEL
168 };
169 
170 static struct snmp_mib snmp4_udp_list[] = {
171 	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
172 	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
173 	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
174 	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
175 	SNMP_MIB_SENTINEL
176 };
177 
178 static struct snmp_mib snmp4_net_list[] = {
179 	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
180 	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
181 	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
182 	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
183 	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
184 	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
185 	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
186 	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
187 	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
188 	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
189 	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
190 	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
191 	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
192 	SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
193 	SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
194 	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
195 	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
196 	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
197 	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
198 	SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
199 	SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
200 	SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
201 	SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
202 	SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
203 	SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
204 	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
205 	SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
206 	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
207 	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
208 	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
209 	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
210 	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
211 	SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
212 	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
213 	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
214 	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
215 	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
216 	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
217 	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
218 	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
219 	SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
220 	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
221 	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
222 	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
223 	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
224 	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
225 	SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
226 	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
227 	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
228 	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
229 	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
230 	SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
231 	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
232 	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
233 	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
234 	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
235 	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
236 	SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
237 	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
238 	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
239 	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
240 	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
241 	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
242 	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
243 	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
244 	SNMP_MIB_SENTINEL
245 };
246 
247 /*
248  *	Called from the PROCfs module. This outputs /proc/net/snmp.
249  */
250 static int snmp_seq_show(struct seq_file *seq, void *v)
251 {
252 	int i;
253 
254 	seq_puts(seq, "Ip: Forwarding DefaultTTL");
255 
256 	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
257 		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
258 
259 	seq_printf(seq, "\nIp: %d %d",
260 			ipv4_devconf.forwarding ? 1 : 2, sysctl_ip_default_ttl);
261 
262 	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
263 		seq_printf(seq, " %lu",
264 			   fold_field((void **) ip_statistics,
265 				      snmp4_ipstats_list[i].entry));
266 
267 	seq_puts(seq, "\nIcmp:");
268 	for (i = 0; snmp4_icmp_list[i].name != NULL; i++)
269 		seq_printf(seq, " %s", snmp4_icmp_list[i].name);
270 
271 	seq_puts(seq, "\nIcmp:");
272 	for (i = 0; snmp4_icmp_list[i].name != NULL; i++)
273 		seq_printf(seq, " %lu",
274 			   fold_field((void **) icmp_statistics,
275 				      snmp4_icmp_list[i].entry));
276 
277 	seq_puts(seq, "\nTcp:");
278 	for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
279 		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
280 
281 	seq_puts(seq, "\nTcp:");
282 	for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
283 		/* MaxConn field is signed, RFC 2012 */
284 		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
285 			seq_printf(seq, " %ld",
286 				   fold_field((void **) tcp_statistics,
287 					      snmp4_tcp_list[i].entry));
288 		else
289 			seq_printf(seq, " %lu",
290 				   fold_field((void **) tcp_statistics,
291 					      snmp4_tcp_list[i].entry));
292 	}
293 
294 	seq_puts(seq, "\nUdp:");
295 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
296 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
297 
298 	seq_puts(seq, "\nUdp:");
299 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
300 		seq_printf(seq, " %lu",
301 			   fold_field((void **) udp_statistics,
302 				      snmp4_udp_list[i].entry));
303 
304 	seq_putc(seq, '\n');
305 	return 0;
306 }
307 
308 static int snmp_seq_open(struct inode *inode, struct file *file)
309 {
310 	return single_open(file, snmp_seq_show, NULL);
311 }
312 
313 static struct file_operations snmp_seq_fops = {
314 	.owner	 = THIS_MODULE,
315 	.open	 = snmp_seq_open,
316 	.read	 = seq_read,
317 	.llseek	 = seq_lseek,
318 	.release = single_release,
319 };
320 
321 /*
322  *	Output /proc/net/netstat
323  */
324 static int netstat_seq_show(struct seq_file *seq, void *v)
325 {
326 	int i;
327 
328 	seq_puts(seq, "TcpExt:");
329 	for (i = 0; snmp4_net_list[i].name != NULL; i++)
330 		seq_printf(seq, " %s", snmp4_net_list[i].name);
331 
332 	seq_puts(seq, "\nTcpExt:");
333 	for (i = 0; snmp4_net_list[i].name != NULL; i++)
334 		seq_printf(seq, " %lu",
335 			   fold_field((void **) net_statistics,
336 				      snmp4_net_list[i].entry));
337 
338 	seq_putc(seq, '\n');
339 	return 0;
340 }
341 
342 static int netstat_seq_open(struct inode *inode, struct file *file)
343 {
344 	return single_open(file, netstat_seq_show, NULL);
345 }
346 
347 static struct file_operations netstat_seq_fops = {
348 	.owner	 = THIS_MODULE,
349 	.open	 = netstat_seq_open,
350 	.read	 = seq_read,
351 	.llseek	 = seq_lseek,
352 	.release = single_release,
353 };
354 
355 int __init ip_misc_proc_init(void)
356 {
357 	int rc = 0;
358 
359 	if (!proc_net_fops_create("netstat", S_IRUGO, &netstat_seq_fops))
360 		goto out_netstat;
361 
362 	if (!proc_net_fops_create("snmp", S_IRUGO, &snmp_seq_fops))
363 		goto out_snmp;
364 
365 	if (!proc_net_fops_create("sockstat", S_IRUGO, &sockstat_seq_fops))
366 		goto out_sockstat;
367 out:
368 	return rc;
369 out_sockstat:
370 	proc_net_remove("snmp");
371 out_snmp:
372 	proc_net_remove("netstat");
373 out_netstat:
374 	rc = -ENOMEM;
375 	goto out;
376 }
377 
378