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  * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11  *		Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
12  *		Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
13  *		Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
14  *
15  * Fixes:
16  *		Alan Cox	:	UDP sockets show the rxqueue/txqueue
17  *					using hint flag for the netinfo.
18  *	Pauline Middelink	:	identd support
19  *		Alan Cox	:	Make /proc safer.
20  *	Erik Schoenfelder	:	/proc/net/snmp
21  *		Alan Cox	:	Handle dead sockets properly.
22  *	Gerhard Koerting	:	Show both timers
23  *		Alan Cox	:	Allow inode to be NULL (kernel socket)
24  *	Andi Kleen		:	Add support for open_requests and
25  *					split functions for more readibility.
26  *	Andi Kleen		:	Add support for /proc/net/netstat
27  *	Arnaldo C. Melo		:	Convert to seq_file
28  *
29  *		This program is free software; you can redistribute it and/or
30  *		modify it under the terms of the GNU General Public License
31  *		as published by the Free Software Foundation; either version
32  *		2 of the License, or (at your option) any later version.
33  */
34 #include <linux/types.h>
35 #include <net/net_namespace.h>
36 #include <net/icmp.h>
37 #include <net/protocol.h>
38 #include <net/tcp.h>
39 #include <net/udp.h>
40 #include <net/udplite.h>
41 #include <linux/bottom_half.h>
42 #include <linux/inetdevice.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/export.h>
46 #include <net/sock.h>
47 #include <net/raw.h>
48 
49 /*
50  *	Report socket allocation statistics [mea@utu.fi]
51  */
sockstat_seq_show(struct seq_file * seq,void * v)52 static int sockstat_seq_show(struct seq_file *seq, void *v)
53 {
54 	struct net *net = seq->private;
55 	int orphans, sockets;
56 
57 	local_bh_disable();
58 	orphans = percpu_counter_sum_positive(&tcp_orphan_count);
59 	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
60 	local_bh_enable();
61 
62 	socket_seq_show(seq);
63 	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
64 		   sock_prot_inuse_get(net, &tcp_prot), orphans,
65 		   tcp_death_row.tw_count, sockets,
66 		   proto_memory_allocated(&tcp_prot));
67 	seq_printf(seq, "UDP: inuse %d mem %ld\n",
68 		   sock_prot_inuse_get(net, &udp_prot),
69 		   proto_memory_allocated(&udp_prot));
70 	seq_printf(seq, "UDPLITE: inuse %d\n",
71 		   sock_prot_inuse_get(net, &udplite_prot));
72 	seq_printf(seq, "RAW: inuse %d\n",
73 		   sock_prot_inuse_get(net, &raw_prot));
74 	seq_printf(seq,  "FRAG: inuse %d memory %d\n",
75 			ip_frag_nqueues(net), ip_frag_mem(net));
76 	return 0;
77 }
78 
sockstat_seq_open(struct inode * inode,struct file * file)79 static int sockstat_seq_open(struct inode *inode, struct file *file)
80 {
81 	return single_open_net(inode, file, sockstat_seq_show);
82 }
83 
84 static const struct file_operations sockstat_seq_fops = {
85 	.owner	 = THIS_MODULE,
86 	.open	 = sockstat_seq_open,
87 	.read	 = seq_read,
88 	.llseek	 = seq_lseek,
89 	.release = single_release_net,
90 };
91 
92 /* snmp items */
93 static const struct snmp_mib snmp4_ipstats_list[] = {
94 	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
95 	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
96 	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
97 	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
98 	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
99 	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
100 	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
101 	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
102 	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
103 	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
104 	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
105 	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
106 	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
107 	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
108 	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
109 	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
110 	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
111 	SNMP_MIB_SENTINEL
112 };
113 
114 /* Following RFC4293 items are displayed in /proc/net/netstat */
115 static const struct snmp_mib snmp4_ipextstats_list[] = {
116 	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
117 	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
118 	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
119 	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
120 	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
121 	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
122 	SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
123 	SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
124 	SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
125 	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
126 	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
127 	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
128 	SNMP_MIB_SENTINEL
129 };
130 
131 static const struct {
132 	const char *name;
133 	int index;
134 } icmpmibmap[] = {
135 	{ "DestUnreachs", ICMP_DEST_UNREACH },
136 	{ "TimeExcds", ICMP_TIME_EXCEEDED },
137 	{ "ParmProbs", ICMP_PARAMETERPROB },
138 	{ "SrcQuenchs", ICMP_SOURCE_QUENCH },
139 	{ "Redirects", ICMP_REDIRECT },
140 	{ "Echos", ICMP_ECHO },
141 	{ "EchoReps", ICMP_ECHOREPLY },
142 	{ "Timestamps", ICMP_TIMESTAMP },
143 	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
144 	{ "AddrMasks", ICMP_ADDRESS },
145 	{ "AddrMaskReps", ICMP_ADDRESSREPLY },
146 	{ NULL, 0 }
147 };
148 
149 
150 static const struct snmp_mib snmp4_tcp_list[] = {
151 	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
152 	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
153 	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
154 	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
155 	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
156 	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
157 	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
158 	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
159 	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
160 	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
161 	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
162 	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
163 	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
164 	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
165 	SNMP_MIB_SENTINEL
166 };
167 
168 static const struct snmp_mib snmp4_udp_list[] = {
169 	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
170 	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
171 	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
172 	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
173 	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
174 	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
175 	SNMP_MIB_SENTINEL
176 };
177 
178 static const 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("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
220 	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
221 	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
222 	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
223 	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
224 	SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
225 	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
226 	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
227 	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
228 	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
229 	SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
230 	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
231 	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
232 	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
233 	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
234 	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
235 	SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
236 	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
237 	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
238 	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
239 	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
240 	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
241 	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
242 	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
243 	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
244 	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
245 	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
246 	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
247 	SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
248 	SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
249 	SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
250 	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
251 	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
252 	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
253 	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
254 	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
255 	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
256 	SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
257 	SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
258 	SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
259 	SNMP_MIB_SENTINEL
260 };
261 
icmpmsg_put_line(struct seq_file * seq,unsigned long * vals,unsigned short * type,int count)262 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
263 			     unsigned short *type, int count)
264 {
265 	int j;
266 
267 	if (count) {
268 		seq_printf(seq, "\nIcmpMsg:");
269 		for (j = 0; j < count; ++j)
270 			seq_printf(seq, " %sType%u",
271 				type[j] & 0x100 ? "Out" : "In",
272 				type[j] & 0xff);
273 		seq_printf(seq, "\nIcmpMsg:");
274 		for (j = 0; j < count; ++j)
275 			seq_printf(seq, " %lu", vals[j]);
276 	}
277 }
278 
icmpmsg_put(struct seq_file * seq)279 static void icmpmsg_put(struct seq_file *seq)
280 {
281 #define PERLINE	16
282 
283 	int i, count;
284 	unsigned short type[PERLINE];
285 	unsigned long vals[PERLINE], val;
286 	struct net *net = seq->private;
287 
288 	count = 0;
289 	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
290 		val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
291 		if (val) {
292 			type[count] = i;
293 			vals[count++] = val;
294 		}
295 		if (count == PERLINE) {
296 			icmpmsg_put_line(seq, vals, type, count);
297 			count = 0;
298 		}
299 	}
300 	icmpmsg_put_line(seq, vals, type, count);
301 
302 #undef PERLINE
303 }
304 
icmp_put(struct seq_file * seq)305 static void icmp_put(struct seq_file *seq)
306 {
307 	int i;
308 	struct net *net = seq->private;
309 	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
310 
311 	seq_puts(seq, "\nIcmp: InMsgs InErrors");
312 	for (i=0; icmpmibmap[i].name != NULL; i++)
313 		seq_printf(seq, " In%s", icmpmibmap[i].name);
314 	seq_printf(seq, " OutMsgs OutErrors");
315 	for (i=0; icmpmibmap[i].name != NULL; i++)
316 		seq_printf(seq, " Out%s", icmpmibmap[i].name);
317 	seq_printf(seq, "\nIcmp: %lu %lu",
318 		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
319 		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
320 	for (i=0; icmpmibmap[i].name != NULL; i++)
321 		seq_printf(seq, " %lu",
322 			   atomic_long_read(ptr + icmpmibmap[i].index));
323 	seq_printf(seq, " %lu %lu",
324 		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
325 		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
326 	for (i=0; icmpmibmap[i].name != NULL; i++)
327 		seq_printf(seq, " %lu",
328 			   atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
329 }
330 
331 /*
332  *	Called from the PROCfs module. This outputs /proc/net/snmp.
333  */
snmp_seq_show(struct seq_file * seq,void * v)334 static int snmp_seq_show(struct seq_file *seq, void *v)
335 {
336 	int i;
337 	struct net *net = seq->private;
338 
339 	seq_puts(seq, "Ip: Forwarding DefaultTTL");
340 
341 	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
342 		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
343 
344 	seq_printf(seq, "\nIp: %d %d",
345 		   IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
346 		   sysctl_ip_default_ttl);
347 
348 	BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
349 	for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
350 		seq_printf(seq, " %llu",
351 			   snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
352 					     snmp4_ipstats_list[i].entry,
353 					     offsetof(struct ipstats_mib, syncp)));
354 
355 	icmp_put(seq);	/* RFC 2011 compatibility */
356 	icmpmsg_put(seq);
357 
358 	seq_puts(seq, "\nTcp:");
359 	for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
360 		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
361 
362 	seq_puts(seq, "\nTcp:");
363 	for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
364 		/* MaxConn field is signed, RFC 2012 */
365 		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
366 			seq_printf(seq, " %ld",
367 				   snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
368 						   snmp4_tcp_list[i].entry));
369 		else
370 			seq_printf(seq, " %lu",
371 				   snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
372 						   snmp4_tcp_list[i].entry));
373 	}
374 
375 	seq_puts(seq, "\nUdp:");
376 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
377 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
378 
379 	seq_puts(seq, "\nUdp:");
380 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
381 		seq_printf(seq, " %lu",
382 			   snmp_fold_field((void __percpu **)net->mib.udp_statistics,
383 					   snmp4_udp_list[i].entry));
384 
385 	/* the UDP and UDP-Lite MIBs are the same */
386 	seq_puts(seq, "\nUdpLite:");
387 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
388 		seq_printf(seq, " %s", snmp4_udp_list[i].name);
389 
390 	seq_puts(seq, "\nUdpLite:");
391 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
392 		seq_printf(seq, " %lu",
393 			   snmp_fold_field((void __percpu **)net->mib.udplite_statistics,
394 					   snmp4_udp_list[i].entry));
395 
396 	seq_putc(seq, '\n');
397 	return 0;
398 }
399 
snmp_seq_open(struct inode * inode,struct file * file)400 static int snmp_seq_open(struct inode *inode, struct file *file)
401 {
402 	return single_open_net(inode, file, snmp_seq_show);
403 }
404 
405 static const struct file_operations snmp_seq_fops = {
406 	.owner	 = THIS_MODULE,
407 	.open	 = snmp_seq_open,
408 	.read	 = seq_read,
409 	.llseek	 = seq_lseek,
410 	.release = single_release_net,
411 };
412 
413 
414 
415 /*
416  *	Output /proc/net/netstat
417  */
netstat_seq_show(struct seq_file * seq,void * v)418 static int netstat_seq_show(struct seq_file *seq, void *v)
419 {
420 	int i;
421 	struct net *net = seq->private;
422 
423 	seq_puts(seq, "TcpExt:");
424 	for (i = 0; snmp4_net_list[i].name != NULL; i++)
425 		seq_printf(seq, " %s", snmp4_net_list[i].name);
426 
427 	seq_puts(seq, "\nTcpExt:");
428 	for (i = 0; snmp4_net_list[i].name != NULL; i++)
429 		seq_printf(seq, " %lu",
430 			   snmp_fold_field((void __percpu **)net->mib.net_statistics,
431 					   snmp4_net_list[i].entry));
432 
433 	seq_puts(seq, "\nIpExt:");
434 	for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
435 		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
436 
437 	seq_puts(seq, "\nIpExt:");
438 	for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
439 		seq_printf(seq, " %llu",
440 			   snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
441 					     snmp4_ipextstats_list[i].entry,
442 					     offsetof(struct ipstats_mib, syncp)));
443 
444 	seq_putc(seq, '\n');
445 	return 0;
446 }
447 
netstat_seq_open(struct inode * inode,struct file * file)448 static int netstat_seq_open(struct inode *inode, struct file *file)
449 {
450 	return single_open_net(inode, file, netstat_seq_show);
451 }
452 
453 static const struct file_operations netstat_seq_fops = {
454 	.owner	 = THIS_MODULE,
455 	.open	 = netstat_seq_open,
456 	.read	 = seq_read,
457 	.llseek	 = seq_lseek,
458 	.release = single_release_net,
459 };
460 
ip_proc_init_net(struct net * net)461 static __net_init int ip_proc_init_net(struct net *net)
462 {
463 	if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
464 		goto out_sockstat;
465 	if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
466 		goto out_netstat;
467 	if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
468 		goto out_snmp;
469 
470 	return 0;
471 
472 out_snmp:
473 	proc_net_remove(net, "netstat");
474 out_netstat:
475 	proc_net_remove(net, "sockstat");
476 out_sockstat:
477 	return -ENOMEM;
478 }
479 
ip_proc_exit_net(struct net * net)480 static __net_exit void ip_proc_exit_net(struct net *net)
481 {
482 	proc_net_remove(net, "snmp");
483 	proc_net_remove(net, "netstat");
484 	proc_net_remove(net, "sockstat");
485 }
486 
487 static __net_initdata struct pernet_operations ip_proc_ops = {
488 	.init = ip_proc_init_net,
489 	.exit = ip_proc_exit_net,
490 };
491 
ip_misc_proc_init(void)492 int __init ip_misc_proc_init(void)
493 {
494 	return register_pernet_subsys(&ip_proc_ops);
495 }
496 
497