net: Fix percpu counters deadlock
[linux-2.6.git] / 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/bottom_half.h>
42 #include <linux/inetdevice.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <net/sock.h>
46 #include <net/raw.h>
47
48 /*
49  *      Report socket allocation statistics [mea@utu.fi]
50  */
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         local_bh_disable();
57         orphans = percpu_counter_sum_positive(&tcp_orphan_count),
58         sockets = percpu_counter_sum_positive(&tcp_sockets_allocated),
59         local_bh_enable();
60
61         socket_seq_show(seq);
62         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
63                    sock_prot_inuse_get(net, &tcp_prot), orphans,
64                    tcp_death_row.tw_count, sockets,
65                    atomic_read(&tcp_memory_allocated));
66         seq_printf(seq, "UDP: inuse %d mem %d\n",
67                    sock_prot_inuse_get(net, &udp_prot),
68                    atomic_read(&udp_memory_allocated));
69         seq_printf(seq, "UDPLITE: inuse %d\n",
70                    sock_prot_inuse_get(net, &udplite_prot));
71         seq_printf(seq, "RAW: inuse %d\n",
72                    sock_prot_inuse_get(net, &raw_prot));
73         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
74                         ip_frag_nqueues(net), ip_frag_mem(net));
75         return 0;
76 }
77
78 static int sockstat_seq_open(struct inode *inode, struct file *file)
79 {
80         return single_open_net(inode, file, sockstat_seq_show);
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_net,
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_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
242         SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
243         SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
244         SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
245         SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
246         SNMP_MIB_SENTINEL
247 };
248
249 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
250                              unsigned short *type, int count)
251 {
252         int j;
253
254         if (count) {
255                 seq_printf(seq, "\nIcmpMsg:");
256                 for (j = 0; j < count; ++j)
257                         seq_printf(seq, " %sType%u",
258                                 type[j] & 0x100 ? "Out" : "In",
259                                 type[j] & 0xff);
260                 seq_printf(seq, "\nIcmpMsg:");
261                 for (j = 0; j < count; ++j)
262                         seq_printf(seq, " %lu", vals[j]);
263         }
264 }
265
266 static void icmpmsg_put(struct seq_file *seq)
267 {
268 #define PERLINE 16
269
270         int i, count;
271         unsigned short type[PERLINE];
272         unsigned long vals[PERLINE], val;
273         struct net *net = seq->private;
274
275         count = 0;
276         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
277                 val = snmp_fold_field((void **) net->mib.icmpmsg_statistics, i);
278                 if (val) {
279                         type[count] = i;
280                         vals[count++] = val;
281                 }
282                 if (count == PERLINE) {
283                         icmpmsg_put_line(seq, vals, type, count);
284                         count = 0;
285                 }
286         }
287         icmpmsg_put_line(seq, vals, type, count);
288
289 #undef PERLINE
290 }
291
292 static void icmp_put(struct seq_file *seq)
293 {
294         int i;
295         struct net *net = seq->private;
296
297         seq_puts(seq, "\nIcmp: InMsgs InErrors");
298         for (i=0; icmpmibmap[i].name != NULL; i++)
299                 seq_printf(seq, " In%s", icmpmibmap[i].name);
300         seq_printf(seq, " OutMsgs OutErrors");
301         for (i=0; icmpmibmap[i].name != NULL; i++)
302                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
303         seq_printf(seq, "\nIcmp: %lu %lu",
304                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
305                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
306         for (i=0; icmpmibmap[i].name != NULL; i++)
307                 seq_printf(seq, " %lu",
308                         snmp_fold_field((void **) net->mib.icmpmsg_statistics,
309                                 icmpmibmap[i].index));
310         seq_printf(seq, " %lu %lu",
311                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
312                 snmp_fold_field((void **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
313         for (i=0; icmpmibmap[i].name != NULL; i++)
314                 seq_printf(seq, " %lu",
315                         snmp_fold_field((void **) net->mib.icmpmsg_statistics,
316                                 icmpmibmap[i].index | 0x100));
317 }
318
319 /*
320  *      Called from the PROCfs module. This outputs /proc/net/snmp.
321  */
322 static int snmp_seq_show(struct seq_file *seq, void *v)
323 {
324         int i;
325         struct net *net = seq->private;
326
327         seq_puts(seq, "Ip: Forwarding DefaultTTL");
328
329         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
330                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
331
332         seq_printf(seq, "\nIp: %d %d",
333                    IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
334                    sysctl_ip_default_ttl);
335
336         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
337                 seq_printf(seq, " %lu",
338                            snmp_fold_field((void **)net->mib.ip_statistics,
339                                            snmp4_ipstats_list[i].entry));
340
341         icmp_put(seq);  /* RFC 2011 compatibility */
342         icmpmsg_put(seq);
343
344         seq_puts(seq, "\nTcp:");
345         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
346                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
347
348         seq_puts(seq, "\nTcp:");
349         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
350                 /* MaxConn field is signed, RFC 2012 */
351                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
352                         seq_printf(seq, " %ld",
353                                    snmp_fold_field((void **)net->mib.tcp_statistics,
354                                                    snmp4_tcp_list[i].entry));
355                 else
356                         seq_printf(seq, " %lu",
357                                    snmp_fold_field((void **)net->mib.tcp_statistics,
358                                                    snmp4_tcp_list[i].entry));
359         }
360
361         seq_puts(seq, "\nUdp:");
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, "\nUdp:");
366         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
367                 seq_printf(seq, " %lu",
368                            snmp_fold_field((void **)net->mib.udp_statistics,
369                                            snmp4_udp_list[i].entry));
370
371         /* the UDP and UDP-Lite MIBs are the same */
372         seq_puts(seq, "\nUdpLite:");
373         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
374                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
375
376         seq_puts(seq, "\nUdpLite:");
377         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
378                 seq_printf(seq, " %lu",
379                            snmp_fold_field((void **)net->mib.udplite_statistics,
380                                            snmp4_udp_list[i].entry));
381
382         seq_putc(seq, '\n');
383         return 0;
384 }
385
386 static int snmp_seq_open(struct inode *inode, struct file *file)
387 {
388         return single_open_net(inode, file, snmp_seq_show);
389 }
390
391 static const struct file_operations snmp_seq_fops = {
392         .owner   = THIS_MODULE,
393         .open    = snmp_seq_open,
394         .read    = seq_read,
395         .llseek  = seq_lseek,
396         .release = single_release_net,
397 };
398
399
400
401 /*
402  *      Output /proc/net/netstat
403  */
404 static int netstat_seq_show(struct seq_file *seq, void *v)
405 {
406         int i;
407         struct net *net = seq->private;
408
409         seq_puts(seq, "TcpExt:");
410         for (i = 0; snmp4_net_list[i].name != NULL; i++)
411                 seq_printf(seq, " %s", snmp4_net_list[i].name);
412
413         seq_puts(seq, "\nTcpExt:");
414         for (i = 0; snmp4_net_list[i].name != NULL; i++)
415                 seq_printf(seq, " %lu",
416                            snmp_fold_field((void **)net->mib.net_statistics,
417                                            snmp4_net_list[i].entry));
418
419         seq_puts(seq, "\nIpExt:");
420         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
421                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
422
423         seq_puts(seq, "\nIpExt:");
424         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
425                 seq_printf(seq, " %lu",
426                            snmp_fold_field((void **)net->mib.ip_statistics,
427                                            snmp4_ipextstats_list[i].entry));
428
429         seq_putc(seq, '\n');
430         return 0;
431 }
432
433 static int netstat_seq_open(struct inode *inode, struct file *file)
434 {
435         return single_open_net(inode, file, netstat_seq_show);
436 }
437
438 static const struct file_operations netstat_seq_fops = {
439         .owner   = THIS_MODULE,
440         .open    = netstat_seq_open,
441         .read    = seq_read,
442         .llseek  = seq_lseek,
443         .release = single_release_net,
444 };
445
446 static __net_init int ip_proc_init_net(struct net *net)
447 {
448         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
449                 goto out_sockstat;
450         if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
451                 goto out_netstat;
452         if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
453                 goto out_snmp;
454
455         return 0;
456
457 out_snmp:
458         proc_net_remove(net, "netstat");
459 out_netstat:
460         proc_net_remove(net, "sockstat");
461 out_sockstat:
462         return -ENOMEM;
463 }
464
465 static __net_exit void ip_proc_exit_net(struct net *net)
466 {
467         proc_net_remove(net, "snmp");
468         proc_net_remove(net, "netstat");
469         proc_net_remove(net, "sockstat");
470 }
471
472 static __net_initdata struct pernet_operations ip_proc_ops = {
473         .init = ip_proc_init_net,
474         .exit = ip_proc_exit_net,
475 };
476
477 int __init ip_misc_proc_init(void)
478 {
479         return register_pernet_subsys(&ip_proc_ops);
480 }
481