linux/net/ipv6/proc.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4 *              operating system.  INET is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              This file implements the various access functions for the
   8 *              PROC file system.  This is very similar to the IPv4 version,
   9 *              except it reports the sockets in the INET6 address family.
  10 *
  11 * Authors:     David S. Miller (davem@caip.rutgers.edu)
  12 *              YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
  13 */
  14#include <linux/socket.h>
  15#include <linux/net.h>
  16#include <linux/ipv6.h>
  17#include <linux/proc_fs.h>
  18#include <linux/seq_file.h>
  19#include <linux/stddef.h>
  20#include <linux/export.h>
  21#include <net/net_namespace.h>
  22#include <net/ip.h>
  23#include <net/sock.h>
  24#include <net/tcp.h>
  25#include <net/udp.h>
  26#include <net/transp_v6.h>
  27#include <net/ipv6.h>
  28
  29#define MAX4(a, b, c, d) \
  30        max_t(u32, max_t(u32, a, b), max_t(u32, c, d))
  31#define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \
  32                        IPSTATS_MIB_MAX, ICMP_MIB_MAX)
  33
  34static int sockstat6_seq_show(struct seq_file *seq, void *v)
  35{
  36        struct net *net = seq->private;
  37
  38        seq_printf(seq, "TCP6: inuse %d\n",
  39                       sock_prot_inuse_get(net, &tcpv6_prot));
  40        seq_printf(seq, "UDP6: inuse %d\n",
  41                       sock_prot_inuse_get(net, &udpv6_prot));
  42        seq_printf(seq, "UDPLITE6: inuse %d\n",
  43                        sock_prot_inuse_get(net, &udplitev6_prot));
  44        seq_printf(seq, "RAW6: inuse %d\n",
  45                       sock_prot_inuse_get(net, &rawv6_prot));
  46        seq_printf(seq, "FRAG6: inuse %u memory %lu\n",
  47                   atomic_read(&net->ipv6.fqdir->rhashtable.nelems),
  48                   frag_mem_limit(net->ipv6.fqdir));
  49        return 0;
  50}
  51
  52static const struct snmp_mib snmp6_ipstats_list[] = {
  53/* ipv6 mib according to RFC 2465 */
  54        SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
  55        SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  56        SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
  57        SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
  58        SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  59        SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  60        SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
  61        SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
  62        SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
  63        SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  64        SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
  65        SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
  66        SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
  67        SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
  68        SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
  69        SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
  70        SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
  71        SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
  72        SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
  73        SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
  74        SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
  75        SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
  76        SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
  77        SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
  78        SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
  79        SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
  80        SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
  81        SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
  82        /* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
  83        SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
  84        SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
  85        SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
  86        SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
  87        SNMP_MIB_SENTINEL
  88};
  89
  90static const struct snmp_mib snmp6_icmp6_list[] = {
  91/* icmpv6 mib according to RFC 2466 */
  92        SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
  93        SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
  94        SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
  95        SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
  96        SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
  97        SNMP_MIB_SENTINEL
  98};
  99
 100/* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
 101static const char *const icmp6type2name[256] = {
 102        [ICMPV6_DEST_UNREACH] = "DestUnreachs",
 103        [ICMPV6_PKT_TOOBIG] = "PktTooBigs",
 104        [ICMPV6_TIME_EXCEED] = "TimeExcds",
 105        [ICMPV6_PARAMPROB] = "ParmProblems",
 106        [ICMPV6_ECHO_REQUEST] = "Echos",
 107        [ICMPV6_ECHO_REPLY] = "EchoReplies",
 108        [ICMPV6_MGM_QUERY] = "GroupMembQueries",
 109        [ICMPV6_MGM_REPORT] = "GroupMembResponses",
 110        [ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
 111        [ICMPV6_MLD2_REPORT] = "MLDv2Reports",
 112        [NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
 113        [NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
 114        [NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
 115        [NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
 116        [NDISC_REDIRECT] = "Redirects",
 117};
 118
 119
 120static const struct snmp_mib snmp6_udp6_list[] = {
 121        SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
 122        SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
 123        SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
 124        SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 125        SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 126        SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
 127        SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
 128        SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
 129        SNMP_MIB_ITEM("Udp6MemErrors", UDP_MIB_MEMERRORS),
 130        SNMP_MIB_SENTINEL
 131};
 132
 133static const struct snmp_mib snmp6_udplite6_list[] = {
 134        SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
 135        SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
 136        SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
 137        SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 138        SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 139        SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
 140        SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
 141        SNMP_MIB_ITEM("UdpLite6MemErrors", UDP_MIB_MEMERRORS),
 142        SNMP_MIB_SENTINEL
 143};
 144
 145static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
 146{
 147        char name[32];
 148        int i;
 149
 150        /* print by name -- deprecated items */
 151        for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
 152                int icmptype;
 153                const char *p;
 154
 155                icmptype = i & 0xff;
 156                p = icmp6type2name[icmptype];
 157                if (!p) /* don't print un-named types here */
 158                        continue;
 159                snprintf(name, sizeof(name), "Icmp6%s%s",
 160                        i & 0x100 ? "Out" : "In", p);
 161                seq_printf(seq, "%-32s\t%lu\n", name,
 162                           atomic_long_read(smib + i));
 163        }
 164
 165        /* print by number (nonzero only) - ICMPMsgStat format */
 166        for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
 167                unsigned long val;
 168
 169                val = atomic_long_read(smib + i);
 170                if (!val)
 171                        continue;
 172                snprintf(name, sizeof(name), "Icmp6%sType%u",
 173                        i & 0x100 ?  "Out" : "In", i & 0xff);
 174                seq_printf(seq, "%-32s\t%lu\n", name, val);
 175        }
 176}
 177
 178/* can be called either with percpu mib (pcpumib != NULL),
 179 * or shared one (smib != NULL)
 180 */
 181static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
 182                                atomic_long_t *smib,
 183                                const struct snmp_mib *itemlist)
 184{
 185        unsigned long buff[SNMP_MIB_MAX];
 186        int i;
 187
 188        if (pcpumib) {
 189                memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
 190
 191                snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
 192                for (i = 0; itemlist[i].name; i++)
 193                        seq_printf(seq, "%-32s\t%lu\n",
 194                                   itemlist[i].name, buff[i]);
 195        } else {
 196                for (i = 0; itemlist[i].name; i++)
 197                        seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
 198                                   atomic_long_read(smib + itemlist[i].entry));
 199        }
 200}
 201
 202static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
 203                                  const struct snmp_mib *itemlist, size_t syncpoff)
 204{
 205        u64 buff64[SNMP_MIB_MAX];
 206        int i;
 207
 208        memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);
 209
 210        snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
 211        for (i = 0; itemlist[i].name; i++)
 212                seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
 213}
 214
 215static int snmp6_seq_show(struct seq_file *seq, void *v)
 216{
 217        struct net *net = (struct net *)seq->private;
 218
 219        snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
 220                            snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
 221        snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
 222                            NULL, snmp6_icmp6_list);
 223        snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
 224        snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
 225                            NULL, snmp6_udp6_list);
 226        snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
 227                            NULL, snmp6_udplite6_list);
 228        return 0;
 229}
 230
 231static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
 232{
 233        struct inet6_dev *idev = (struct inet6_dev *)seq->private;
 234
 235        seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
 236        snmp6_seq_show_item64(seq, idev->stats.ipv6,
 237                            snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
 238        snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
 239                            snmp6_icmp6_list);
 240        snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
 241        return 0;
 242}
 243
 244int snmp6_register_dev(struct inet6_dev *idev)
 245{
 246        struct proc_dir_entry *p;
 247        struct net *net;
 248
 249        if (!idev || !idev->dev)
 250                return -EINVAL;
 251
 252        net = dev_net(idev->dev);
 253        if (!net->mib.proc_net_devsnmp6)
 254                return -ENOENT;
 255
 256        p = proc_create_single_data(idev->dev->name, 0444,
 257                        net->mib.proc_net_devsnmp6, snmp6_dev_seq_show, idev);
 258        if (!p)
 259                return -ENOMEM;
 260
 261        idev->stats.proc_dir_entry = p;
 262        return 0;
 263}
 264
 265int snmp6_unregister_dev(struct inet6_dev *idev)
 266{
 267        struct net *net = dev_net(idev->dev);
 268        if (!net->mib.proc_net_devsnmp6)
 269                return -ENOENT;
 270        if (!idev->stats.proc_dir_entry)
 271                return -EINVAL;
 272        proc_remove(idev->stats.proc_dir_entry);
 273        idev->stats.proc_dir_entry = NULL;
 274        return 0;
 275}
 276
 277static int __net_init ipv6_proc_init_net(struct net *net)
 278{
 279        if (!proc_create_net_single("sockstat6", 0444, net->proc_net,
 280                        sockstat6_seq_show, NULL))
 281                return -ENOMEM;
 282
 283        if (!proc_create_net_single("snmp6", 0444, net->proc_net,
 284                        snmp6_seq_show, NULL))
 285                goto proc_snmp6_fail;
 286
 287        net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
 288        if (!net->mib.proc_net_devsnmp6)
 289                goto proc_dev_snmp6_fail;
 290        return 0;
 291
 292proc_dev_snmp6_fail:
 293        remove_proc_entry("snmp6", net->proc_net);
 294proc_snmp6_fail:
 295        remove_proc_entry("sockstat6", net->proc_net);
 296        return -ENOMEM;
 297}
 298
 299static void __net_exit ipv6_proc_exit_net(struct net *net)
 300{
 301        remove_proc_entry("sockstat6", net->proc_net);
 302        remove_proc_entry("dev_snmp6", net->proc_net);
 303        remove_proc_entry("snmp6", net->proc_net);
 304}
 305
 306static struct pernet_operations ipv6_proc_ops = {
 307        .init = ipv6_proc_init_net,
 308        .exit = ipv6_proc_exit_net,
 309};
 310
 311int __init ipv6_misc_proc_init(void)
 312{
 313        return register_pernet_subsys(&ipv6_proc_ops);
 314}
 315
 316void ipv6_misc_proc_exit(void)
 317{
 318        unregister_pernet_subsys(&ipv6_proc_ops);
 319}
 320