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linux/net/ipv4/proc.c
Yuchung Cheng 783237e8da net-tcp: Fast Open client - sending SYN-data 
This patch implements sending SYN-data in tcp_connect(). The data is
from tcp_sendmsg() with flag MSG_FASTOPEN (implemented in a later patch).

The length of the cookie in tcp_fastopen_req, init'd to 0, controls the
type of the SYN. If the cookie is not cached (len==0), the host sends
data-less SYN with Fast Open cookie request option to solicit a cookie
from the remote. If cookie is not available (len > 0), the host sends
a SYN-data with Fast Open cookie option. If cookie length is negative,
  the SYN will not include any Fast Open option (for fall back operations).

To deal with middleboxes that may drop SYN with data or experimental TCP
option, the SYN-data is only sent once. SYN retransmits do not include
data or Fast Open options. The connection will fall back to regular TCP
handshake.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-19 11:02:03 -07:00

504 lines
18 KiB
C
Raw Blame History

/*
* 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.
*
* 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/bottom_half.h>
#include <linux/inetdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/export.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)
{
struct net *net = seq->private;
int orphans, sockets;
local_bh_disable();
orphans = percpu_counter_sum_positive(&tcp_orphan_count);
sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
local_bh_enable();
socket_seq_show(seq);
seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
sock_prot_inuse_get(net, &tcp_prot), orphans,
tcp_death_row.tw_count, sockets,
proto_memory_allocated(&tcp_prot));
seq_printf(seq, "UDP: inuse %d mem %ld\n",
sock_prot_inuse_get(net, &udp_prot),
proto_memory_allocated(&udp_prot));
seq_printf(seq, "UDPLITE: inuse %d\n",
sock_prot_inuse_get(net, &udplite_prot));
seq_printf(seq, "RAW: inuse %d\n",
sock_prot_inuse_get(net, &raw_prot));
seq_printf(seq, "FRAG: inuse %d memory %d\n",
ip_frag_nqueues(net), ip_frag_mem(net));
return 0;
}
static int sockstat_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, sockstat_seq_show);
}
static const struct file_operations sockstat_seq_fops = {
.owner = THIS_MODULE,
.open = sockstat_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
/* snmp items */
static const struct snmp_mib snmp4_ipstats_list[] = {
SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
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_OUTPKTS),
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_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
SNMP_MIB_SENTINEL
};
static const struct {
const 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("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("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_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
SNMP_MIB_SENTINEL
};
static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
unsigned short *type, int count)
{
int j;
if (count) {
seq_printf(seq, "\nIcmpMsg:");
for (j = 0; j < count; ++j)
seq_printf(seq, " %sType%u",
type[j] & 0x100 ? "Out" : "In",
type[j] & 0xff);
seq_printf(seq, "\nIcmpMsg:");
for (j = 0; j < count; ++j)
seq_printf(seq, " %lu", vals[j]);
}
}
static void icmpmsg_put(struct seq_file *seq)
{
#define PERLINE 16
int i, count;
unsigned short type[PERLINE];
unsigned long vals[PERLINE], val;
struct net *net = seq->private;
count = 0;
for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
if (val) {
type[count] = i;
vals[count++] = val;
}
if (count == PERLINE) {
icmpmsg_put_line(seq, vals, type, count);
count = 0;
}
}
icmpmsg_put_line(seq, vals, type, count);
#undef PERLINE
}
static void icmp_put(struct seq_file *seq)
{
int i;
struct net *net = seq->private;
atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
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 __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
for (i=0; icmpmibmap[i].name != NULL; i++)
seq_printf(seq, " %lu",
atomic_long_read(ptr + icmpmibmap[i].index));
seq_printf(seq, " %lu %lu",
snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
for (i=0; icmpmibmap[i].name != NULL; i++)
seq_printf(seq, " %lu",
atomic_long_read(ptr + (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;
struct net *net = seq->private;
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(net, FORWARDING) ? 1 : 2,
sysctl_ip_default_ttl);
BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
seq_printf(seq, " %llu",
snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
snmp4_ipstats_list[i].entry,
offsetof(struct ipstats_mib, syncp)));
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 __percpu **)net->mib.tcp_statistics,
snmp4_tcp_list[i].entry));
else
seq_printf(seq, " %lu",
snmp_fold_field((void __percpu **)net->mib.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 __percpu **)net->mib.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 __percpu **)net->mib.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_net(inode, file, snmp_seq_show);
}
static const struct file_operations snmp_seq_fops = {
.owner = THIS_MODULE,
.open = snmp_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
/*
* Output /proc/net/netstat
*/
static int netstat_seq_show(struct seq_file *seq, void *v)
{
int i;
struct net *net = seq->private;
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 __percpu **)net->mib.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, " %llu",
snmp_fold_field64((void __percpu **)net->mib.ip_statistics,
snmp4_ipextstats_list[i].entry,
offsetof(struct ipstats_mib, syncp)));
seq_putc(seq, '\n');
return 0;
}
static int netstat_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, netstat_seq_show);
}
static const struct file_operations netstat_seq_fops = {
.owner = THIS_MODULE,
.open = netstat_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static __net_init int ip_proc_init_net(struct net *net)
{
if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
goto out_sockstat;
if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
goto out_netstat;
if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
goto out_snmp;
return 0;
out_snmp:
proc_net_remove(net, "netstat");
out_netstat:
proc_net_remove(net, "sockstat");
out_sockstat:
return -ENOMEM;
}
static __net_exit void ip_proc_exit_net(struct net *net)
{
proc_net_remove(net, "snmp");
proc_net_remove(net, "netstat");
proc_net_remove(net, "sockstat");
}
static __net_initdata struct pernet_operations ip_proc_ops = {
.init = ip_proc_init_net,
.exit = ip_proc_exit_net,
};
int __init ip_misc_proc_init(void)
{
return register_pernet_subsys(&ip_proc_ops);
}
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