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 <net/udplite.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 static int fold_prot_inuse(struct proto *proto) 49 { 50 int res = 0; 51 int cpu; 52 53 for_each_possible_cpu(cpu) 54 res += proto->stats[cpu].inuse; 55 56 return res; 57 } 58 59 /* 60 * Report socket allocation statistics [mea@utu.fi] 61 */ 62 static int sockstat_seq_show(struct seq_file *seq, void *v) 63 { 64 socket_seq_show(seq); 65 seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n", 66 fold_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count), 67 tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated), 68 atomic_read(&tcp_memory_allocated)); 69 seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_prot)); 70 seq_printf(seq, "UDPLITE: inuse %d\n", fold_prot_inuse(&udplite_prot)); 71 seq_printf(seq, "RAW: inuse %d\n", fold_prot_inuse(&raw_prot)); 72 seq_printf(seq, "FRAG: inuse %d memory %d\n", ip_frag_nqueues, 73 atomic_read(&ip_frag_mem)); 74 return 0; 75 } 76 77 static int sockstat_seq_open(struct inode *inode, struct file *file) 78 { 79 return single_open(file, sockstat_seq_show, NULL); 80 } 81 82 static const struct file_operations sockstat_seq_fops = { 83 .owner = THIS_MODULE, 84 .open = sockstat_seq_open, 85 .read = seq_read, 86 .llseek = seq_lseek, 87 .release = single_release, 88 }; 89 90 /* snmp items */ 91 static const struct snmp_mib snmp4_ipstats_list[] = { 92 SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES), 93 SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS), 94 SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS), 95 SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS), 96 SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS), 97 SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS), 98 SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS), 99 SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS), 100 SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS), 101 SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES), 102 SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT), 103 SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS), 104 SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS), 105 SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS), 106 SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS), 107 SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS), 108 SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES), 109 SNMP_MIB_SENTINEL 110 }; 111 112 /* Following RFC4293 items are displayed in /proc/net/netstat */ 113 static const struct snmp_mib snmp4_ipextstats_list[] = { 114 SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES), 115 SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS), 116 SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS), 117 SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS), 118 SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS), 119 SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS), 120 SNMP_MIB_SENTINEL 121 }; 122 123 static const struct snmp_mib snmp4_icmp_list[] = { 124 SNMP_MIB_ITEM("InMsgs", ICMP_MIB_INMSGS), 125 SNMP_MIB_ITEM("InErrors", ICMP_MIB_INERRORS), 126 SNMP_MIB_ITEM("InDestUnreachs", ICMP_MIB_INDESTUNREACHS), 127 SNMP_MIB_ITEM("InTimeExcds", ICMP_MIB_INTIMEEXCDS), 128 SNMP_MIB_ITEM("InParmProbs", ICMP_MIB_INPARMPROBS), 129 SNMP_MIB_ITEM("InSrcQuenchs", ICMP_MIB_INSRCQUENCHS), 130 SNMP_MIB_ITEM("InRedirects", ICMP_MIB_INREDIRECTS), 131 SNMP_MIB_ITEM("InEchos", ICMP_MIB_INECHOS), 132 SNMP_MIB_ITEM("InEchoReps", ICMP_MIB_INECHOREPS), 133 SNMP_MIB_ITEM("InTimestamps", ICMP_MIB_INTIMESTAMPS), 134 SNMP_MIB_ITEM("InTimestampReps", ICMP_MIB_INTIMESTAMPREPS), 135 SNMP_MIB_ITEM("InAddrMasks", ICMP_MIB_INADDRMASKS), 136 SNMP_MIB_ITEM("InAddrMaskReps", ICMP_MIB_INADDRMASKREPS), 137 SNMP_MIB_ITEM("OutMsgs", ICMP_MIB_OUTMSGS), 138 SNMP_MIB_ITEM("OutErrors", ICMP_MIB_OUTERRORS), 139 SNMP_MIB_ITEM("OutDestUnreachs", ICMP_MIB_OUTDESTUNREACHS), 140 SNMP_MIB_ITEM("OutTimeExcds", ICMP_MIB_OUTTIMEEXCDS), 141 SNMP_MIB_ITEM("OutParmProbs", ICMP_MIB_OUTPARMPROBS), 142 SNMP_MIB_ITEM("OutSrcQuenchs", ICMP_MIB_OUTSRCQUENCHS), 143 SNMP_MIB_ITEM("OutRedirects", ICMP_MIB_OUTREDIRECTS), 144 SNMP_MIB_ITEM("OutEchos", ICMP_MIB_OUTECHOS), 145 SNMP_MIB_ITEM("OutEchoReps", ICMP_MIB_OUTECHOREPS), 146 SNMP_MIB_ITEM("OutTimestamps", ICMP_MIB_OUTTIMESTAMPS), 147 SNMP_MIB_ITEM("OutTimestampReps", ICMP_MIB_OUTTIMESTAMPREPS), 148 SNMP_MIB_ITEM("OutAddrMasks", ICMP_MIB_OUTADDRMASKS), 149 SNMP_MIB_ITEM("OutAddrMaskReps", ICMP_MIB_OUTADDRMASKREPS), 150 SNMP_MIB_SENTINEL 151 }; 152 153 static const struct snmp_mib snmp4_tcp_list[] = { 154 SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM), 155 SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN), 156 SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX), 157 SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN), 158 SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS), 159 SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS), 160 SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS), 161 SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS), 162 SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB), 163 SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS), 164 SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS), 165 SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS), 166 SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS), 167 SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS), 168 SNMP_MIB_SENTINEL 169 }; 170 171 static const struct snmp_mib snmp4_udp_list[] = { 172 SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS), 173 SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS), 174 SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS), 175 SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS), 176 SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS), 177 SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS), 178 SNMP_MIB_SENTINEL 179 }; 180 181 static const struct snmp_mib snmp4_net_list[] = { 182 SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT), 183 SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV), 184 SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED), 185 SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS), 186 SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED), 187 SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED), 188 SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED), 189 SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS), 190 SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS), 191 SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER), 192 SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED), 193 SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED), 194 SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED), 195 SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED), 196 SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED), 197 SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED), 198 SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS), 199 SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED), 200 SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST), 201 SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS), 202 SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS), 203 SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED), 204 SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG), 205 SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE), 206 SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED), 207 SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS), 208 SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER), 209 SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS), 210 SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS), 211 SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY), 212 SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY), 213 SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING), 214 SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER), 215 SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER), 216 SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER), 217 SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER), 218 SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO), 219 SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO), 220 SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO), 221 SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO), 222 SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS), 223 SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT), 224 SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES), 225 SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES), 226 SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES), 227 SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS), 228 SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS), 229 SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS), 230 SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS), 231 SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL), 232 SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL), 233 SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED), 234 SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED), 235 SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT), 236 SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT), 237 SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV), 238 SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV), 239 SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN), 240 SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA), 241 SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE), 242 SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY), 243 SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT), 244 SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER), 245 SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED), 246 SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES), 247 SNMP_MIB_SENTINEL 248 }; 249 250 /* 251 * Called from the PROCfs module. This outputs /proc/net/snmp. 252 */ 253 static int snmp_seq_show(struct seq_file *seq, void *v) 254 { 255 int i; 256 257 seq_puts(seq, "Ip: Forwarding DefaultTTL"); 258 259 for (i = 0; snmp4_ipstats_list[i].name != NULL; i++) 260 seq_printf(seq, " %s", snmp4_ipstats_list[i].name); 261 262 seq_printf(seq, "\nIp: %d %d", 263 IPV4_DEVCONF_ALL(FORWARDING) ? 1 : 2, sysctl_ip_default_ttl); 264 265 for (i = 0; snmp4_ipstats_list[i].name != NULL; i++) 266 seq_printf(seq, " %lu", 267 snmp_fold_field((void **)ip_statistics, 268 snmp4_ipstats_list[i].entry)); 269 270 seq_puts(seq, "\nIcmp:"); 271 for (i = 0; snmp4_icmp_list[i].name != NULL; i++) 272 seq_printf(seq, " %s", snmp4_icmp_list[i].name); 273 274 seq_puts(seq, "\nIcmp:"); 275 for (i = 0; snmp4_icmp_list[i].name != NULL; i++) 276 seq_printf(seq, " %lu", 277 snmp_fold_field((void **)icmp_statistics, 278 snmp4_icmp_list[i].entry)); 279 280 seq_puts(seq, "\nTcp:"); 281 for (i = 0; snmp4_tcp_list[i].name != NULL; i++) 282 seq_printf(seq, " %s", snmp4_tcp_list[i].name); 283 284 seq_puts(seq, "\nTcp:"); 285 for (i = 0; snmp4_tcp_list[i].name != NULL; i++) { 286 /* MaxConn field is signed, RFC 2012 */ 287 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN) 288 seq_printf(seq, " %ld", 289 snmp_fold_field((void **)tcp_statistics, 290 snmp4_tcp_list[i].entry)); 291 else 292 seq_printf(seq, " %lu", 293 snmp_fold_field((void **)tcp_statistics, 294 snmp4_tcp_list[i].entry)); 295 } 296 297 seq_puts(seq, "\nUdp:"); 298 for (i = 0; snmp4_udp_list[i].name != NULL; i++) 299 seq_printf(seq, " %s", snmp4_udp_list[i].name); 300 301 seq_puts(seq, "\nUdp:"); 302 for (i = 0; snmp4_udp_list[i].name != NULL; i++) 303 seq_printf(seq, " %lu", 304 snmp_fold_field((void **)udp_statistics, 305 snmp4_udp_list[i].entry)); 306 307 /* the UDP and UDP-Lite MIBs are the same */ 308 seq_puts(seq, "\nUdpLite:"); 309 for (i = 0; snmp4_udp_list[i].name != NULL; i++) 310 seq_printf(seq, " %s", snmp4_udp_list[i].name); 311 312 seq_puts(seq, "\nUdpLite:"); 313 for (i = 0; snmp4_udp_list[i].name != NULL; i++) 314 seq_printf(seq, " %lu", 315 snmp_fold_field((void **)udplite_statistics, 316 snmp4_udp_list[i].entry)); 317 318 seq_putc(seq, '\n'); 319 return 0; 320 } 321 322 static int snmp_seq_open(struct inode *inode, struct file *file) 323 { 324 return single_open(file, snmp_seq_show, NULL); 325 } 326 327 static const struct file_operations snmp_seq_fops = { 328 .owner = THIS_MODULE, 329 .open = snmp_seq_open, 330 .read = seq_read, 331 .llseek = seq_lseek, 332 .release = single_release, 333 }; 334 335 /* 336 * Output /proc/net/netstat 337 */ 338 static int netstat_seq_show(struct seq_file *seq, void *v) 339 { 340 int i; 341 342 seq_puts(seq, "TcpExt:"); 343 for (i = 0; snmp4_net_list[i].name != NULL; i++) 344 seq_printf(seq, " %s", snmp4_net_list[i].name); 345 346 seq_puts(seq, "\nTcpExt:"); 347 for (i = 0; snmp4_net_list[i].name != NULL; i++) 348 seq_printf(seq, " %lu", 349 snmp_fold_field((void **)net_statistics, 350 snmp4_net_list[i].entry)); 351 352 seq_puts(seq, "\nIpExt:"); 353 for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++) 354 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name); 355 356 seq_puts(seq, "\nIpExt:"); 357 for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++) 358 seq_printf(seq, " %lu", 359 snmp_fold_field((void **)ip_statistics, 360 snmp4_ipextstats_list[i].entry)); 361 362 seq_putc(seq, '\n'); 363 return 0; 364 } 365 366 static int netstat_seq_open(struct inode *inode, struct file *file) 367 { 368 return single_open(file, netstat_seq_show, NULL); 369 } 370 371 static const struct file_operations netstat_seq_fops = { 372 .owner = THIS_MODULE, 373 .open = netstat_seq_open, 374 .read = seq_read, 375 .llseek = seq_lseek, 376 .release = single_release, 377 }; 378 379 int __init ip_misc_proc_init(void) 380 { 381 int rc = 0; 382 383 if (!proc_net_fops_create("netstat", S_IRUGO, &netstat_seq_fops)) 384 goto out_netstat; 385 386 if (!proc_net_fops_create("snmp", S_IRUGO, &snmp_seq_fops)) 387 goto out_snmp; 388 389 if (!proc_net_fops_create("sockstat", S_IRUGO, &sockstat_seq_fops)) 390 goto out_sockstat; 391 out: 392 return rc; 393 out_sockstat: 394 proc_net_remove("snmp"); 395 out_snmp: 396 proc_net_remove("netstat"); 397 out_netstat: 398 rc = -ENOMEM; 399 goto out; 400 } 401 402