net/ipv6/proc.c - linux - Git at Google

 /*
  * 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.  This is very similar to the IPv4 version,
  *		except it reports the sockets in the INET6 address family.
  *
  * Authors:	David S. Miller (davem@caip.rutgers.edu)
  *		YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
  *
  *		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/socket.h>
 #include <linux/net.h>
 #include <linux/ipv6.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/stddef.h>
 #include <linux/export.h>
 #include <net/net_namespace.h>
 #include <net/ip.h>
 #include <net/sock.h>
 #include <net/tcp.h>
 #include <net/udp.h>
 #include <net/transp_v6.h>
 #include <net/ipv6.h>

 #define MAX4(a, b, c, d) \
 	max_t(u32, max_t(u32, a, b), max_t(u32, c, d))
 #define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \
 			IPSTATS_MIB_MAX, ICMP_MIB_MAX)

 static int sockstat6_seq_show(struct seq_file *seq, void *v)
 {
 	struct net *net = seq->private;
 	unsigned int frag_mem = ip6_frag_mem(net);

 	seq_printf(seq, "TCP6: inuse %d\n",
 		       sock_prot_inuse_get(net, &tcpv6_prot));
 	seq_printf(seq, "UDP6: inuse %d\n",
 		       sock_prot_inuse_get(net, &udpv6_prot));
 	seq_printf(seq, "UDPLITE6: inuse %d\n",
 			sock_prot_inuse_get(net, &udplitev6_prot));
 	seq_printf(seq, "RAW6: inuse %d\n",
 		       sock_prot_inuse_get(net, &rawv6_prot));
 	seq_printf(seq, "FRAG6: inuse %u memory %u\n", !!frag_mem, frag_mem);
 	return 0;
 }

 static int sockstat6_seq_open(struct inode *inode, struct file *file)
 {
 	return single_open_net(inode, file, sockstat6_seq_show);
 }

 static const struct file_operations sockstat6_seq_fops = {
 	.open	 = sockstat6_seq_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,
 	.release = single_release_net,
 };

 static const struct snmp_mib snmp6_ipstats_list[] = {
 /* ipv6 mib according to RFC 2465 */
 	SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
 	SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
 	SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
 	SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
 	SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
 	SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
 	SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 	SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
 	SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
 	SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
 	SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
 	SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 	SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 	SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 	SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
 	SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
 	SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
 	SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
 	SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
 	SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
 	SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 	SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 	SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
 	SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
 	SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
 	SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
 	SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
 	SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
 	/* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
 	SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
 	SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
 	SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
 	SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
 	SNMP_MIB_SENTINEL
 };

 static const struct snmp_mib snmp6_icmp6_list[] = {
 /* icmpv6 mib according to RFC 2466 */
 	SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
 	SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
 	SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
 	SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
 	SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
 	SNMP_MIB_SENTINEL
 };

 /* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
 static const char *const icmp6type2name[256] = {
 	[ICMPV6_DEST_UNREACH] = "DestUnreachs",
 	[ICMPV6_PKT_TOOBIG] = "PktTooBigs",
 	[ICMPV6_TIME_EXCEED] = "TimeExcds",
 	[ICMPV6_PARAMPROB] = "ParmProblems",
 	[ICMPV6_ECHO_REQUEST] = "Echos",
 	[ICMPV6_ECHO_REPLY] = "EchoReplies",
 	[ICMPV6_MGM_QUERY] = "GroupMembQueries",
 	[ICMPV6_MGM_REPORT] = "GroupMembResponses",
 	[ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
 	[ICMPV6_MLD2_REPORT] = "MLDv2Reports",
 	[NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
 	[NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
 	[NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
 	[NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
 	[NDISC_REDIRECT] = "Redirects",
 };


 static const struct snmp_mib snmp6_udp6_list[] = {
 	SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
 	SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
 	SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
 	SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 	SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 	SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
 	SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
 	SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
 	SNMP_MIB_SENTINEL
 };

 static const struct snmp_mib snmp6_udplite6_list[] = {
 	SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
 	SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
 	SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
 	SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 	SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 	SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
 	SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
 	SNMP_MIB_SENTINEL
 };

 static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
 {
 	char name[32];
 	int i;

 	/* print by name -- deprecated items */
 	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
 		int icmptype;
 		const char *p;

 		icmptype = i & 0xff;
 		p = icmp6type2name[icmptype];
 		if (!p)	/* don't print un-named types here */
 			continue;
 		snprintf(name, sizeof(name), "Icmp6%s%s",
 			i & 0x100 ? "Out" : "In", p);
 		seq_printf(seq, "%-32s\t%lu\n", name,
 			   atomic_long_read(smib + i));
 	}

 	/* print by number (nonzero only) - ICMPMsgStat format */
 	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
 		unsigned long val;

 		val = atomic_long_read(smib + i);
 		if (!val)
 			continue;
 		snprintf(name, sizeof(name), "Icmp6%sType%u",
 			i & 0x100 ?  "Out" : "In", i & 0xff);
 		seq_printf(seq, "%-32s\t%lu\n", name, val);
 	}
 }

 /* can be called either with percpu mib (pcpumib != NULL),
  * or shared one (smib != NULL)
  */
 static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
 				atomic_long_t *smib,
 				const struct snmp_mib *itemlist)
 {
 	unsigned long buff[SNMP_MIB_MAX];
 	int i;

 	if (pcpumib) {
 		memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);

 		snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
 		for (i = 0; itemlist[i].name; i++)
 			seq_printf(seq, "%-32s\t%lu\n",
 				   itemlist[i].name, buff[i]);
 	} else {
 		for (i = 0; itemlist[i].name; i++)
 			seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
 				   atomic_long_read(smib + itemlist[i].entry));
 	}
 }

 static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
 				  const struct snmp_mib *itemlist, size_t syncpoff)
 {
 	u64 buff64[SNMP_MIB_MAX];
 	int i;

 	memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);

 	snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
 	for (i = 0; itemlist[i].name; i++)
 		seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
 }

 static int snmp6_seq_show(struct seq_file *seq, void *v)
 {
 	struct net *net = (struct net *)seq->private;

 	snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
 			    snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
 	snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
 			    NULL, snmp6_icmp6_list);
 	snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
 	snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
 			    NULL, snmp6_udp6_list);
 	snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
 			    NULL, snmp6_udplite6_list);
 	return 0;
 }

 static int snmp6_seq_open(struct inode *inode, struct file *file)
 {
 	return single_open_net(inode, file, snmp6_seq_show);
 }

 static const struct file_operations snmp6_seq_fops = {
 	.open	 = snmp6_seq_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,
 	.release = single_release_net,
 };

 static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
 {
 	struct inet6_dev *idev = (struct inet6_dev *)seq->private;

 	seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
 	snmp6_seq_show_item64(seq, idev->stats.ipv6,
 			    snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
 	snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
 			    snmp6_icmp6_list);
 	snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
 	return 0;
 }

 static int snmp6_dev_seq_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, snmp6_dev_seq_show, PDE_DATA(inode));
 }

 static const struct file_operations snmp6_dev_seq_fops = {
 	.open	 = snmp6_dev_seq_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,
 	.release = single_release,
 };

 int snmp6_register_dev(struct inet6_dev *idev)
 {
 	struct proc_dir_entry *p;
 	struct net *net;

 	if (!idev || !idev->dev)
 		return -EINVAL;

 	net = dev_net(idev->dev);
 	if (!net->mib.proc_net_devsnmp6)
 		return -ENOENT;

 	p = proc_create_data(idev->dev->name, S_IRUGO,
 			     net->mib.proc_net_devsnmp6,
 			     &snmp6_dev_seq_fops, idev);
 	if (!p)
 		return -ENOMEM;

 	idev->stats.proc_dir_entry = p;
 	return 0;
 }

 int snmp6_unregister_dev(struct inet6_dev *idev)
 {
 	struct net *net = dev_net(idev->dev);
 	if (!net->mib.proc_net_devsnmp6)
 		return -ENOENT;
 	if (!idev->stats.proc_dir_entry)
 		return -EINVAL;
 	proc_remove(idev->stats.proc_dir_entry);
 	idev->stats.proc_dir_entry = NULL;
 	return 0;
 }

 static int __net_init ipv6_proc_init_net(struct net *net)
 {
 	if (!proc_create("sockstat6", S_IRUGO, net->proc_net,
 			 &sockstat6_seq_fops))
 		return -ENOMEM;

 	if (!proc_create("snmp6", S_IRUGO, net->proc_net, &snmp6_seq_fops))
 		goto proc_snmp6_fail;

 	net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
 	if (!net->mib.proc_net_devsnmp6)
 		goto proc_dev_snmp6_fail;
 	return 0;

 proc_dev_snmp6_fail:
 	remove_proc_entry("snmp6", net->proc_net);
 proc_snmp6_fail:
 	remove_proc_entry("sockstat6", net->proc_net);
 	return -ENOMEM;
 }

 static void __net_exit ipv6_proc_exit_net(struct net *net)
 {
 	remove_proc_entry("sockstat6", net->proc_net);
 	remove_proc_entry("dev_snmp6", net->proc_net);
 	remove_proc_entry("snmp6", net->proc_net);
 }

 static struct pernet_operations ipv6_proc_ops = {
 	.init = ipv6_proc_init_net,
 	.exit = ipv6_proc_exit_net,
 	.async = true,
 };

 int __init ipv6_misc_proc_init(void)
 {
 	return register_pernet_subsys(&ipv6_proc_ops);
 }

 void ipv6_misc_proc_exit(void)
 {
 	unregister_pernet_subsys(&ipv6_proc_ops);
 }
	/*
	* 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. This is very similar to the IPv4 version,
	* except it reports the sockets in the INET6 address family.
	*
	* Authors: David S. Miller (davem@caip.rutgers.edu)
	* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
	*
	* 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/socket.h>
	#include <linux/net.h>
	#include <linux/ipv6.h>
	#include <linux/proc_fs.h>
	#include <linux/seq_file.h>
	#include <linux/stddef.h>
	#include <linux/export.h>
	#include <net/net_namespace.h>
	#include <net/ip.h>
	#include <net/sock.h>
	#include <net/tcp.h>
	#include <net/udp.h>
	#include <net/transp_v6.h>
	#include <net/ipv6.h>

	#define MAX4(a, b, c, d) \
	max_t(u32, max_t(u32, a, b), max_t(u32, c, d))
	#define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \
	IPSTATS_MIB_MAX, ICMP_MIB_MAX)

	static int sockstat6_seq_show(struct seq_file seq, void v)
	{
	struct net *net = seq->private;
	unsigned int frag_mem = ip6_frag_mem(net);

	seq_printf(seq, "TCP6: inuse %d\n",
	sock_prot_inuse_get(net, &tcpv6_prot));
	seq_printf(seq, "UDP6: inuse %d\n",
	sock_prot_inuse_get(net, &udpv6_prot));
	seq_printf(seq, "UDPLITE6: inuse %d\n",
	sock_prot_inuse_get(net, &udplitev6_prot));
	seq_printf(seq, "RAW6: inuse %d\n",
	sock_prot_inuse_get(net, &rawv6_prot));
	seq_printf(seq, "FRAG6: inuse %u memory %u\n", !!frag_mem, frag_mem);
	return 0;
	}

	static int sockstat6_seq_open(struct inode inode, struct file file)
	{
	return single_open_net(inode, file, sockstat6_seq_show);
	}

	static const struct file_operations sockstat6_seq_fops = {
	.open = sockstat6_seq_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release_net,
	};

	static const struct snmp_mib snmp6_ipstats_list[] = {
	/* ipv6 mib according to RFC 2465 */
	SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
	SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
	SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
	SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
	SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
	SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
	SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
	SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
	SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
	SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
	SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
	SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
	SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
	SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
	SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
	SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
	SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
	SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
	SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
	SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
	SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
	SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
	SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
	SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
	SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
	SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
	SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
	SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
	/* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
	SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
	SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
	SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
	SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
	SNMP_MIB_SENTINEL
	};

	static const struct snmp_mib snmp6_icmp6_list[] = {
	/* icmpv6 mib according to RFC 2466 */
	SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
	SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
	SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
	SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
	SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
	SNMP_MIB_SENTINEL
	};

	/* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
	static const char *const icmp6type2name[256] = {
	[ICMPV6_DEST_UNREACH] = "DestUnreachs",
	[ICMPV6_PKT_TOOBIG] = "PktTooBigs",
	[ICMPV6_TIME_EXCEED] = "TimeExcds",
	[ICMPV6_PARAMPROB] = "ParmProblems",
	[ICMPV6_ECHO_REQUEST] = "Echos",
	[ICMPV6_ECHO_REPLY] = "EchoReplies",
	[ICMPV6_MGM_QUERY] = "GroupMembQueries",
	[ICMPV6_MGM_REPORT] = "GroupMembResponses",
	[ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
	[ICMPV6_MLD2_REPORT] = "MLDv2Reports",
	[NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
	[NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
	[NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
	[NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
	[NDISC_REDIRECT] = "Redirects",
	};


	static const struct snmp_mib snmp6_udp6_list[] = {
	SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
	SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
	SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
	SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
	SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
	SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
	SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
	SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
	SNMP_MIB_SENTINEL
	};

	static const struct snmp_mib snmp6_udplite6_list[] = {
	SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
	SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
	SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
	SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
	SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
	SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
	SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
	SNMP_MIB_SENTINEL
	};

	static void snmp6_seq_show_icmpv6msg(struct seq_file seq, atomic_long_t smib)
	{
	char name[32];
	int i;

	/* print by name -- deprecated items */
	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
	int icmptype;
	const char *p;

	icmptype = i & 0xff;
	p = icmp6type2name[icmptype];
	if (!p) /* don't print un-named types here */
	continue;
	snprintf(name, sizeof(name), "Icmp6%s%s",
	i & 0x100 ? "Out" : "In", p);
	seq_printf(seq, "%-32s\t%lu\n", name,
	atomic_long_read(smib + i));
	}

	/* print by number (nonzero only) - ICMPMsgStat format */
	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
	unsigned long val;

	val = atomic_long_read(smib + i);
	if (!val)
	continue;
	snprintf(name, sizeof(name), "Icmp6%sType%u",
	i & 0x100 ? "Out" : "In", i & 0xff);
	seq_printf(seq, "%-32s\t%lu\n", name, val);
	}
	}

	/* can be called either with percpu mib (pcpumib != NULL),
	* or shared one (smib != NULL)
	*/
	static void snmp6_seq_show_item(struct seq_file seq, void __percpu pcpumib,
	atomic_long_t *smib,
	const struct snmp_mib *itemlist)
	{
	unsigned long buff[SNMP_MIB_MAX];
	int i;

	if (pcpumib) {
	memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);

	snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
	for (i = 0; itemlist[i].name; i++)
	seq_printf(seq, "%-32s\t%lu\n",
	itemlist[i].name, buff[i]);
	} else {
	for (i = 0; itemlist[i].name; i++)
	seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
	atomic_long_read(smib + itemlist[i].entry));
	}
	}

	static void snmp6_seq_show_item64(struct seq_file seq, void __percpu mib,
	const struct snmp_mib *itemlist, size_t syncpoff)
	{
	u64 buff64[SNMP_MIB_MAX];
	int i;

	memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);

	snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
	for (i = 0; itemlist[i].name; i++)
	seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
	}

	static int snmp6_seq_show(struct seq_file seq, void v)
	{
	struct net net = (struct net )seq->private;

	snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
	snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
	snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
	NULL, snmp6_icmp6_list);
	snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
	snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
	NULL, snmp6_udp6_list);
	snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
	NULL, snmp6_udplite6_list);
	return 0;
	}

	static int snmp6_seq_open(struct inode inode, struct file file)
	{
	return single_open_net(inode, file, snmp6_seq_show);
	}

	static const struct file_operations snmp6_seq_fops = {
	.open = snmp6_seq_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release_net,
	};

	static int snmp6_dev_seq_show(struct seq_file seq, void v)
	{
	struct inet6_dev idev = (struct inet6_dev )seq->private;

	seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
	snmp6_seq_show_item64(seq, idev->stats.ipv6,
	snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
	snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
	snmp6_icmp6_list);
	snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
	return 0;
	}

	static int snmp6_dev_seq_open(struct inode inode, struct file file)
	{
	return single_open(file, snmp6_dev_seq_show, PDE_DATA(inode));
	}

	static const struct file_operations snmp6_dev_seq_fops = {
	.open = snmp6_dev_seq_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	int snmp6_register_dev(struct inet6_dev *idev)
	{
	struct proc_dir_entry *p;
	struct net *net;

	if (!idev \|\| !idev->dev)
	return -EINVAL;

	net = dev_net(idev->dev);
	if (!net->mib.proc_net_devsnmp6)
	return -ENOENT;

	p = proc_create_data(idev->dev->name, S_IRUGO,
	net->mib.proc_net_devsnmp6,
	&snmp6_dev_seq_fops, idev);
	if (!p)
	return -ENOMEM;

	idev->stats.proc_dir_entry = p;
	return 0;
	}

	int snmp6_unregister_dev(struct inet6_dev *idev)
	{
	struct net *net = dev_net(idev->dev);
	if (!net->mib.proc_net_devsnmp6)
	return -ENOENT;
	if (!idev->stats.proc_dir_entry)
	return -EINVAL;
	proc_remove(idev->stats.proc_dir_entry);
	idev->stats.proc_dir_entry = NULL;
	return 0;
	}

	static int __net_init ipv6_proc_init_net(struct net *net)
	{
	if (!proc_create("sockstat6", S_IRUGO, net->proc_net,
	&sockstat6_seq_fops))
	return -ENOMEM;

	if (!proc_create("snmp6", S_IRUGO, net->proc_net, &snmp6_seq_fops))
	goto proc_snmp6_fail;

	net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
	if (!net->mib.proc_net_devsnmp6)
	goto proc_dev_snmp6_fail;
	return 0;

	proc_dev_snmp6_fail:
	remove_proc_entry("snmp6", net->proc_net);
	proc_snmp6_fail:
	remove_proc_entry("sockstat6", net->proc_net);
	return -ENOMEM;
	}

	static void __net_exit ipv6_proc_exit_net(struct net *net)
	{
	remove_proc_entry("sockstat6", net->proc_net);
	remove_proc_entry("dev_snmp6", net->proc_net);
	remove_proc_entry("snmp6", net->proc_net);
	}

	static struct pernet_operations ipv6_proc_ops = {
	.init = ipv6_proc_init_net,
	.exit = ipv6_proc_exit_net,
	.async = true,
	};

	int __init ipv6_misc_proc_init(void)
	{
	return register_pernet_subsys(&ipv6_proc_ops);
	}

	void ipv6_misc_proc_exit(void)
	{
	unregister_pernet_subsys(&ipv6_proc_ops);
	}