Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * INET         An implementation of the TCP/IP protocol suite for the LINUX

 *              operating system.  INET is implemented using the  BSD Socket

 *              interface as the means of communication with the user level.

 *

 *              This file implements the various access functions for the

 *              PROC file system.  It is mainly used for debugging and

 *              statistics.

 *

 * Version:     $Id: proc.c,v 1.45 2001/05/16 16:45:35 davem Exp $

 *

 * Authors:     Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>

 *              Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>

 *              Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>

 *              Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>

 *

 * Fixes:

 *              Alan Cox        :       UDP sockets show the rxqueue/txqueue

 *                                      using hint flag for the netinfo.

 *      Pauline Middelink       :       identd support

 *              Alan Cox        :       Make /proc safer.

 *      Erik Schoenfelder       :       /proc/net/snmp

 *              Alan Cox        :       Handle dead sockets properly.

 *      Gerhard Koerting        :       Show both timers

 *              Alan Cox        :       Allow inode to be NULL (kernel socket)

 *      Andi Kleen              :       Add support for open_requests and

 *                                      split functions for more readibility.

 *      Andi Kleen              :       Add support for /proc/net/netstat

 *      Arnaldo C. Melo         :       Convert to seq_file

 *

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 */

#include <linux/types.h>

#include <net/net_namespace.h>

#include <net/icmp.h>

#include <net/protocol.h>

#include <net/tcp.h>

#include <net/udp.h>

#include <net/udplite.h>

#include <linux/inetdevice.h>

#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include <net/sock.h>

#include <net/raw.h>

/*

 *      Report socket allocation statistics [mea@utu.fi]

 */

static int sockstat_seq_show(struct seq_file *seq, void *v)

{

        socket_seq_show(seq);

        seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",

                   sock_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count),

                   tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),

                   atomic_read(&tcp_memory_allocated));

        seq_printf(seq, "UDP: inuse %d\n", sock_prot_inuse(&udp_prot));

        seq_printf(seq, "UDPLITE: inuse %d\n", sock_prot_inuse(&udplite_prot));

        seq_printf(seq, "RAW: inuse %d\n", sock_prot_inuse(&raw_prot));

        seq_printf(seq,  "FRAG: inuse %d memory %d\n",

                        ip_frag_nqueues(), ip_frag_mem());

        return 0;

}

static int sockstat_seq_open(struct inode *inode, struct file *file)

{

        return single_open(file, sockstat_seq_show, NULL);

}

static const struct file_operations sockstat_seq_fops = {

        .owner   = THIS_MODULE,

        .open    = sockstat_seq_open,

        .read    = seq_read,

        .llseek  = seq_lseek,

        .release = single_release,

};

/* snmp items */

static const struct snmp_mib snmp4_ipstats_list[] = {

        SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INRECEIVES),

        SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),

        SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),

        SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),

        SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),

        SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),

        SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),

        SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),

        SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),

        SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),

        SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),

        SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),

        SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),

        SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),

        SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),

        SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),

        SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),

        SNMP_MIB_SENTINEL

};

/* Following RFC4293 items are displayed in /proc/net/netstat */

static const struct snmp_mib snmp4_ipextstats_list[] = {

        SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),

        SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),

        SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),

        SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),

        SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),

        SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),

        SNMP_MIB_SENTINEL

};

static struct {

        char *name;

        int index;

} icmpmibmap[] = {

        { "DestUnreachs", ICMP_DEST_UNREACH },

        { "TimeExcds", ICMP_TIME_EXCEEDED },

        { "ParmProbs", ICMP_PARAMETERPROB },

        { "SrcQuenchs", ICMP_SOURCE_QUENCH },

        { "Redirects", ICMP_REDIRECT },

        { "Echos", ICMP_ECHO },

        { "EchoReps", ICMP_ECHOREPLY },

        { "Timestamps", ICMP_TIMESTAMP },

        { "TimestampReps", ICMP_TIMESTAMPREPLY },

        { "AddrMasks", ICMP_ADDRESS },

        { "AddrMaskReps", ICMP_ADDRESSREPLY },

        { NULL, 0 }

};

static const struct snmp_mib snmp4_tcp_list[] = {

        SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),

        SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),

        SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),

        SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),

        SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),

        SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),

        SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),

        SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),

        SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),

        SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),

        SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),

        SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),

        SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),

        SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),

        SNMP_MIB_SENTINEL

};

static const struct snmp_mib snmp4_udp_list[] = {

        SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),

        SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),

        SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),

        SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),

        SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),

        SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),

        SNMP_MIB_SENTINEL

};

static const struct snmp_mib snmp4_net_list[] = {

        SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),

        SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),

        SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),

        SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),

        SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),

        SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),

        SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),

        SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),

        SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),

        SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),

        SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),

        SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),

        SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),

        SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),

        SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),

        SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),

        SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),

        SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),

        SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),

        SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),

        SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),

        SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),

        SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),

        SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),

        SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),

        SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),

        SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),

        SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),

        SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),

        SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),

        SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),

        SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),

        SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),

        SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),

        SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),

        SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),

        SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),

        SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),

        SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),

        SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),

        SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),

        SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),

        SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),

        SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),

        SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),

        SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),

        SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),

        SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),

        SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),

        SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),

        SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),

        SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),

        SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),

        SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),

        SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),

        SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),

        SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),

        SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),

        SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),

        SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),

        SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),

        SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),

        SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),

        SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),

        SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),

        SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),

        SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),

        SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),

        SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),

        SNMP_MIB_SENTINEL

};

static void icmpmsg_put(struct seq_file *seq)

{

#define PERLINE 16

        int j, i, count;

        static int out[PERLINE];

        count = 0;

        for (i = 0; i < ICMPMSG_MIB_MAX; i++) {

                if (snmp_fold_field((void **) icmpmsg_statistics, i))

                        out[count++] = i;

                if (count < PERLINE)

                        continue;

                seq_printf(seq, "\nIcmpMsg:");

                for (j = 0; j < PERLINE; ++j)

                        seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",

                                        i & 0xff);

                seq_printf(seq, "\nIcmpMsg: ");

                for (j = 0; j < PERLINE; ++j)

                        seq_printf(seq, " %lu",

                                snmp_fold_field((void **) icmpmsg_statistics,

                                out[j]));

                seq_putc(seq, '\n');

        }

        if (count) {

                seq_printf(seq, "\nIcmpMsg:");

                for (j = 0; j < count; ++j)

                        seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" :

                                "In", out[j] & 0xff);

                seq_printf(seq, "\nIcmpMsg:");

                for (j = 0; j < count; ++j)

                        seq_printf(seq, " %lu", snmp_fold_field((void **)

                                icmpmsg_statistics, out[j]));

        }

#undef PERLINE

}

static void icmp_put(struct seq_file *seq)

{

        int i;

        seq_puts(seq, "\nIcmp: InMsgs InErrors");

        for (i=0; icmpmibmap[i].name != NULL; i++)

                seq_printf(seq, " In%s", icmpmibmap[i].name);

        seq_printf(seq, " OutMsgs OutErrors");

        for (i=0; icmpmibmap[i].name != NULL; i++)

                seq_printf(seq, " Out%s", icmpmibmap[i].name);

        seq_printf(seq, "\nIcmp: %lu %lu",

                snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INMSGS),

                snmp_fold_field((void **) icmp_statistics, ICMP_MIB_INERRORS));

        for (i=0; icmpmibmap[i].name != NULL; i++)

                seq_printf(seq, " %lu",

                        snmp_fold_field((void **) icmpmsg_statistics,

                                icmpmibmap[i].index));

        seq_printf(seq, " %lu %lu",

                snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTMSGS),

                snmp_fold_field((void **) icmp_statistics, ICMP_MIB_OUTERRORS));

        for (i=0; icmpmibmap[i].name != NULL; i++)

                seq_printf(seq, " %lu",

                        snmp_fold_field((void **) icmpmsg_statistics,

                                icmpmibmap[i].index | 0x100));

}

/*

 *      Called from the PROCfs module. This outputs /proc/net/snmp.

 */

static int snmp_seq_show(struct seq_file *seq, void *v)

{

        int i;

        seq_puts(seq, "Ip: Forwarding DefaultTTL");

        for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)

                seq_printf(seq, " %s", snmp4_ipstats_list[i].name);

        seq_printf(seq, "\nIp: %d %d",

                   IPV4_DEVCONF_ALL(FORWARDING) ? 1 : 2, sysctl_ip_default_ttl);

        for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)

                seq_printf(seq, " %lu",

                           snmp_fold_field((void **)ip_statistics,

                                           snmp4_ipstats_list[i].entry));

        icmp_put(seq);  /* RFC 2011 compatibility */

        icmpmsg_put(seq);

        seq_puts(seq, "\nTcp:");

        for (i = 0; snmp4_tcp_list[i].name != NULL; i++)

                seq_printf(seq, " %s", snmp4_tcp_list[i].name);

        seq_puts(seq, "\nTcp:");

        for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {

                /* MaxConn field is signed, RFC 2012 */

                if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)

                        seq_printf(seq, " %ld",

                                   snmp_fold_field((void **)tcp_statistics,

                                                   snmp4_tcp_list[i].entry));

                else

                        seq_printf(seq, " %lu",

                                   snmp_fold_field((void **)tcp_statistics,

                                                   snmp4_tcp_list[i].entry));

        }

        seq_puts(seq, "\nUdp:");

        for (i = 0; snmp4_udp_list[i].name != NULL; i++)

                seq_printf(seq, " %s", snmp4_udp_list[i].name);

        seq_puts(seq, "\nUdp:");

        for (i = 0; snmp4_udp_list[i].name != NULL; i++)

                seq_printf(seq, " %lu",

                           snmp_fold_field((void **)udp_statistics,

                                           snmp4_udp_list[i].entry));

        /* the UDP and UDP-Lite MIBs are the same */

        seq_puts(seq, "\nUdpLite:");

        for (i = 0; snmp4_udp_list[i].name != NULL; i++)

                seq_printf(seq, " %s", snmp4_udp_list[i].name);

        seq_puts(seq, "\nUdpLite:");

        for (i = 0; snmp4_udp_list[i].name != NULL; i++)

                seq_printf(seq, " %lu",

                           snmp_fold_field((void **)udplite_statistics,

                                           snmp4_udp_list[i].entry));

        seq_putc(seq, '\n');

        return 0;

}

static int snmp_seq_open(struct inode *inode, struct file *file)

{

        return single_open(file, snmp_seq_show, NULL);

}

static const struct file_operations snmp_seq_fops = {

        .owner   = THIS_MODULE,

        .open    = snmp_seq_open,

        .read    = seq_read,

        .llseek  = seq_lseek,

        .release = single_release,

};

/*

 *      Output /proc/net/netstat

 */

static int netstat_seq_show(struct seq_file *seq, void *v)

{

        int i;

        seq_puts(seq, "TcpExt:");

        for (i = 0; snmp4_net_list[i].name != NULL; i++)

                seq_printf(seq, " %s", snmp4_net_list[i].name);

        seq_puts(seq, "\nTcpExt:");

        for (i = 0; snmp4_net_list[i].name != NULL; i++)

                seq_printf(seq, " %lu",

                           snmp_fold_field((void **)net_statistics,

                                           snmp4_net_list[i].entry));

        seq_puts(seq, "\nIpExt:");

        for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)

                seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);

        seq_puts(seq, "\nIpExt:");

        for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)

                seq_printf(seq, " %lu",

                           snmp_fold_field((void **)ip_statistics,

                                           snmp4_ipextstats_list[i].entry));

        seq_putc(seq, '\n');

        return 0;

}

static int netstat_seq_open(struct inode *inode, struct file *file)

{

        return single_open(file, netstat_seq_show, NULL);

}

static const struct file_operations netstat_seq_fops = {

        .owner   = THIS_MODULE,

        .open    = netstat_seq_open,

        .read    = seq_read,

        .llseek  = seq_lseek,

        .release = single_release,

};

int __init ip_misc_proc_init(void)

{

        int rc = 0;

        if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))

                goto out_netstat;

        if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))

                goto out_snmp;

        if (!proc_net_fops_create(&init_net, "sockstat", S_IRUGO, &sockstat_seq_fops))

                goto out_sockstat;

out:

        return rc;

out_sockstat:

        proc_net_remove(&init_net, "snmp");

out_snmp:

        proc_net_remove(&init_net, "netstat");

out_netstat:

        rc = -ENOMEM;

        goto out;

}