Merge branch 's3c-moves2' of git://aeryn.fluff.org.uk/bjdooks/linux into devel
[linux-2.6] / net / ipv4 / proc.c
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/inetdevice.h>
42 #include <linux/proc_fs.h>
43 #include <linux/seq_file.h>
44 #include <net/sock.h>
45 #include <net/raw.h>
46
47 /*
48  *      Report socket allocation statistics [mea@utu.fi]
49  */
50 static int sockstat_seq_show(struct seq_file *seq, void *v)
51 {
52         struct net *net = seq->private;
53
54         socket_seq_show(seq);
55         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
56                    sock_prot_inuse_get(net, &tcp_prot),
57                    atomic_read(&tcp_orphan_count),
58                    tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
59                    atomic_read(&tcp_memory_allocated));
60         seq_printf(seq, "UDP: inuse %d mem %d\n",
61                    sock_prot_inuse_get(net, &udp_prot),
62                    atomic_read(&udp_memory_allocated));
63         seq_printf(seq, "UDPLITE: inuse %d\n",
64                    sock_prot_inuse_get(net, &udplite_prot));
65         seq_printf(seq, "RAW: inuse %d\n",
66                    sock_prot_inuse_get(net, &raw_prot));
67         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
68                         ip_frag_nqueues(net), ip_frag_mem(net));
69         return 0;
70 }
71
72 static int sockstat_seq_open(struct inode *inode, struct file *file)
73 {
74         return single_open_net(inode, file, sockstat_seq_show);
75 }
76
77 static const struct file_operations sockstat_seq_fops = {
78         .owner   = THIS_MODULE,
79         .open    = sockstat_seq_open,
80         .read    = seq_read,
81         .llseek  = seq_lseek,
82         .release = single_release_net,
83 };
84
85 /* snmp items */
86 static const struct snmp_mib snmp4_ipstats_list[] = {
87         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),
88         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
89         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
90         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
91         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
92         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
93         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
94         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
95         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
96         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
97         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
98         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
99         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
100         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
101         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
102         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
103         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
104         SNMP_MIB_SENTINEL
105 };
106
107 /* Following RFC4293 items are displayed in /proc/net/netstat */
108 static const struct snmp_mib snmp4_ipextstats_list[] = {
109         SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
110         SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
111         SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
112         SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
113         SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
114         SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
115         SNMP_MIB_SENTINEL
116 };
117
118 static struct {
119         char *name;
120         int index;
121 } icmpmibmap[] = {
122         { "DestUnreachs", ICMP_DEST_UNREACH },
123         { "TimeExcds", ICMP_TIME_EXCEEDED },
124         { "ParmProbs", ICMP_PARAMETERPROB },
125         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
126         { "Redirects", ICMP_REDIRECT },
127         { "Echos", ICMP_ECHO },
128         { "EchoReps", ICMP_ECHOREPLY },
129         { "Timestamps", ICMP_TIMESTAMP },
130         { "TimestampReps", ICMP_TIMESTAMPREPLY },
131         { "AddrMasks", ICMP_ADDRESS },
132         { "AddrMaskReps", ICMP_ADDRESSREPLY },
133         { NULL, 0 }
134 };
135
136
137 static const struct snmp_mib snmp4_tcp_list[] = {
138         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
139         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
140         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
141         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
142         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
143         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
144         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
145         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
146         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
147         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
148         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
149         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
150         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
151         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
152         SNMP_MIB_SENTINEL
153 };
154
155 static const struct snmp_mib snmp4_udp_list[] = {
156         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
157         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
158         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
159         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
160         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
161         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
162         SNMP_MIB_SENTINEL
163 };
164
165 static const struct snmp_mib snmp4_net_list[] = {
166         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
167         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
168         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
169         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
170         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
171         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
172         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
173         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
174         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
175         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
176         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
177         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
178         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
179         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
180         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
181         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
182         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
183         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
184         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
185         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
186         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
187         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
188         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
189         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
190         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
191         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
192         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
193         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
194         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
195         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
196         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
197         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
198         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
199         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
200         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
201         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
202         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
203         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
204         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
205         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
206         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
207         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
208         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
209         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
210         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
211         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
212         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
213         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
214         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
215         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
216         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
217         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
218         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
219         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
220         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
221         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
222         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
223         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
224         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
225         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
226         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
227         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
228         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
229         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
230         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
231         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
232         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
233         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
234         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
235         SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
236         SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
237         SNMP_MIB_SENTINEL
238 };
239
240 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
241                              unsigned short *type, int count)
242 {
243         int j;
244
245         if (count) {
246                 seq_printf(seq, "\nIcmpMsg:");
247                 for (j = 0; j < count; ++j)
248                         seq_printf(seq, " %sType%u",
249                                 type[j] & 0x100 ? "Out" : "In",
250                                 type[j] & 0xff);
251                 seq_printf(seq, "\nIcmpMsg:");
252                 for (j = 0; j < count; ++j)
253                         seq_printf(seq, " %lu", vals[j]);
254         }
255 }
256
257 static void icmpmsg_put(struct seq_file *seq)
258 {
259 #define PERLINE 16
260
261         int i, count;
262         unsigned short type[PERLINE];
263         unsigned long vals[PERLINE], val;
264         struct net *net = seq->private;
265
266         count = 0;
267         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
268                 val = snmp_fold_field((void **) net->mib.icmpmsg_statistics, i);
269                 if (val) {
270                         type[count] = i;
271                         vals[count++] = val;
272                 }
273                 if (count == PERLINE) {
274                         icmpmsg_put_line(seq, vals, type, count);
275                         count = 0;
276                 }
277         }
278         icmpmsg_put_line(seq, vals, type, count);
279
280 #undef PERLINE
281 }
282
283 static void icmp_put(struct seq_file *seq)
284 {
285         int i;
286         struct net *net = seq->private;
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 **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
296                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
297         for (i=0; icmpmibmap[i].name != NULL; i++)
298                 seq_printf(seq, " %lu",
299                         snmp_fold_field((void **) net->mib.icmpmsg_statistics,
300                                 icmpmibmap[i].index));
301         seq_printf(seq, " %lu %lu",
302                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
303                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
304         for (i=0; icmpmibmap[i].name != NULL; i++)
305                 seq_printf(seq, " %lu",
306                         snmp_fold_field((void **) net->mib.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         struct net *net = seq->private;
317
318         seq_puts(seq, "Ip: Forwarding DefaultTTL");
319
320         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
321                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
322
323         seq_printf(seq, "\nIp: %d %d",
324                    IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
325                    sysctl_ip_default_ttl);
326
327         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
328                 seq_printf(seq, " %lu",
329                            snmp_fold_field((void **)net->mib.ip_statistics,
330                                            snmp4_ipstats_list[i].entry));
331
332         icmp_put(seq);  /* RFC 2011 compatibility */
333         icmpmsg_put(seq);
334
335         seq_puts(seq, "\nTcp:");
336         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
337                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
338
339         seq_puts(seq, "\nTcp:");
340         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
341                 /* MaxConn field is signed, RFC 2012 */
342                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
343                         seq_printf(seq, " %ld",
344                                    snmp_fold_field((void **)net->mib.tcp_statistics,
345                                                    snmp4_tcp_list[i].entry));
346                 else
347                         seq_printf(seq, " %lu",
348                                    snmp_fold_field((void **)net->mib.tcp_statistics,
349                                                    snmp4_tcp_list[i].entry));
350         }
351
352         seq_puts(seq, "\nUdp:");
353         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
354                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
355
356         seq_puts(seq, "\nUdp:");
357         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
358                 seq_printf(seq, " %lu",
359                            snmp_fold_field((void **)net->mib.udp_statistics,
360                                            snmp4_udp_list[i].entry));
361
362         /* the UDP and UDP-Lite MIBs are the same */
363         seq_puts(seq, "\nUdpLite:");
364         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
365                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
366
367         seq_puts(seq, "\nUdpLite:");
368         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
369                 seq_printf(seq, " %lu",
370                            snmp_fold_field((void **)net->mib.udplite_statistics,
371                                            snmp4_udp_list[i].entry));
372
373         seq_putc(seq, '\n');
374         return 0;
375 }
376
377 static int snmp_seq_open(struct inode *inode, struct file *file)
378 {
379         return single_open_net(inode, file, snmp_seq_show);
380 }
381
382 static const struct file_operations snmp_seq_fops = {
383         .owner   = THIS_MODULE,
384         .open    = snmp_seq_open,
385         .read    = seq_read,
386         .llseek  = seq_lseek,
387         .release = single_release_net,
388 };
389
390
391
392 /*
393  *      Output /proc/net/netstat
394  */
395 static int netstat_seq_show(struct seq_file *seq, void *v)
396 {
397         int i;
398         struct net *net = seq->private;
399
400         seq_puts(seq, "TcpExt:");
401         for (i = 0; snmp4_net_list[i].name != NULL; i++)
402                 seq_printf(seq, " %s", snmp4_net_list[i].name);
403
404         seq_puts(seq, "\nTcpExt:");
405         for (i = 0; snmp4_net_list[i].name != NULL; i++)
406                 seq_printf(seq, " %lu",
407                            snmp_fold_field((void **)net->mib.net_statistics,
408                                            snmp4_net_list[i].entry));
409
410         seq_puts(seq, "\nIpExt:");
411         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
412                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
413
414         seq_puts(seq, "\nIpExt:");
415         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
416                 seq_printf(seq, " %lu",
417                            snmp_fold_field((void **)net->mib.ip_statistics,
418                                            snmp4_ipextstats_list[i].entry));
419
420         seq_putc(seq, '\n');
421         return 0;
422 }
423
424 static int netstat_seq_open(struct inode *inode, struct file *file)
425 {
426         return single_open_net(inode, file, netstat_seq_show);
427 }
428
429 static const struct file_operations netstat_seq_fops = {
430         .owner   = THIS_MODULE,
431         .open    = netstat_seq_open,
432         .read    = seq_read,
433         .llseek  = seq_lseek,
434         .release = single_release_net,
435 };
436
437 static __net_init int ip_proc_init_net(struct net *net)
438 {
439         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
440                 goto out_sockstat;
441         if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
442                 goto out_netstat;
443         if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
444                 goto out_snmp;
445
446         return 0;
447
448 out_snmp:
449         proc_net_remove(net, "netstat");
450 out_netstat:
451         proc_net_remove(net, "sockstat");
452 out_sockstat:
453         return -ENOMEM;
454 }
455
456 static __net_exit void ip_proc_exit_net(struct net *net)
457 {
458         proc_net_remove(net, "snmp");
459         proc_net_remove(net, "netstat");
460         proc_net_remove(net, "sockstat");
461 }
462
463 static __net_initdata struct pernet_operations ip_proc_ops = {
464         .init = ip_proc_init_net,
465         .exit = ip_proc_exit_net,
466 };
467
468 int __init ip_misc_proc_init(void)
469 {
470         return register_pernet_subsys(&ip_proc_ops);
471 }
472