proc.c

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/*
 * 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 ([email protected])
 *      YOSHIFUJI Hideaki <[email protected]>
 *
 *      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>

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

    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 %d memory %d\n",
               ip6_frag_nqueues(net), ip6_frag_mem(net));
    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 = {
    .owner   = THIS_MODULE,
    .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),
    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_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_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_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)
{
    int i;
    unsigned long val;

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

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

    for (i = 0; itemlist[i].name; i++)
        seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name,
               snmp_fold_field64(mib, itemlist[i].entry, syncpoff));
}

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

    snmp6_seq_show_item64(seq, (void __percpu **)net->mib.ipv6_statistics,
                snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
    snmp6_seq_show_item(seq, (void __percpu **)net->mib.icmpv6_statistics,
                NULL, snmp6_icmp6_list);
    snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
    snmp6_seq_show_item(seq, (void __percpu **)net->mib.udp_stats_in6,
                NULL, snmp6_udp6_list);
    snmp6_seq_show_item(seq, (void __percpu **)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 = {
    .owner   = THIS_MODULE,
    .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, (void __percpu **)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(inode)->data);
}

static const struct file_operations snmp6_dev_seq_fops = {
    .owner   = THIS_MODULE,
    .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;
    remove_proc_entry(idev->stats.proc_dir_entry->name,
              net->mib.proc_net_devsnmp6);
    idev->stats.proc_dir_entry = NULL;
    return 0;
}

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

    if (!proc_net_fops_create(net, "snmp6", S_IRUGO, &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:
    proc_net_remove(net, "snmp6");
proc_snmp6_fail:
    proc_net_remove(net, "sockstat6");
    return -ENOMEM;
}

static void __net_exit ipv6_proc_exit_net(struct net *net)
{
    proc_net_remove(net, "sockstat6");
    proc_net_remove(net, "dev_snmp6");
    proc_net_remove(net, "snmp6");
}

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

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);
}