net/ipv6/proc.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              This file implements the various access functions for the
   7  *              PROC file system.  This is very similar to the IPv4 version,
   8  *              except it reports the sockets in the INET6 address family.
   9  *
  10  * Authors:     David S. Miller (davem@caip.rutgers.edu)
  11  *              YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
  12  *
  13  *              This program is free software; you can redistribute it and/or
  14  *              modify it under the terms of the GNU General Public License
  15  *              as published by the Free Software Foundation; either version
  16  *              2 of the License, or (at your option) any later version.
  17  */
  18 #include <linux/socket.h>
  19 #include <linux/net.h>
  20 #include <linux/ipv6.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/stddef.h>
  24 #include <linux/export.h>
  25 #include <net/net_namespace.h>
  26 #include <net/ip.h>
  27 #include <net/sock.h>
  28 #include <net/tcp.h>
  29 #include <net/udp.h>
  30 #include <net/transp_v6.h>
  31 #include <net/ipv6.h>
  32
  33 #define MAX4(a, b, c, d) \
  34         max_t(u32, max_t(u32, a, b), max_t(u32, c, d))
  35 #define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \
  36                         IPSTATS_MIB_MAX, ICMP_MIB_MAX)
  37
  38 static int sockstat6_seq_show(struct seq_file *seq, void *v)
  39 {
  40         struct net *net = seq->private;
  41
  42         seq_printf(seq, "TCP6: inuse %d\n",
  43                        sock_prot_inuse_get(net, &tcpv6_prot));
  44         seq_printf(seq, "UDP6: inuse %d\n",
  45                        sock_prot_inuse_get(net, &udpv6_prot));
  46         seq_printf(seq, "UDPLITE6: inuse %d\n",
  47                         sock_prot_inuse_get(net, &udplitev6_prot));
  48         seq_printf(seq, "RAW6: inuse %d\n",
  49                        sock_prot_inuse_get(net, &rawv6_prot));
  50         seq_printf(seq, "FRAG6: inuse %u memory %lu\n",
  51                    atomic_read(&net->ipv6.frags.rhashtable.nelems),
  52                    frag_mem_limit(&net->ipv6.frags));
  53         return 0;
  54 }
  55
  56 static const struct snmp_mib snmp6_ipstats_list[] = {
  57 /* ipv6 mib according to RFC 2465 */
  58         SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
  59         SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  60         SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
  61         SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
  62         SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  63         SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  64         SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
  65         SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
  66         SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
  67         SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  68         SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
  69         SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
  70         SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
  71         SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
  72         SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
  73         SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
  74         SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
  75         SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
  76         SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
  77         SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
  78         SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
  79         SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
  80         SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
  81         SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
  82         SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
  83         SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
  84         SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
  85         SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
  86         /* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
  87         SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
  88         SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
  89         SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
  90         SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
  91         SNMP_MIB_SENTINEL
  92 };
  93
  94 static const struct snmp_mib snmp6_icmp6_list[] = {
  95 /* icmpv6 mib according to RFC 2466 */
  96         SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
  97         SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
  98         SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
  99         SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
 100         SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
 101         SNMP_MIB_SENTINEL
 102 };
 103
 104 /* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
 105 static const char *const icmp6type2name[256] = {
 106         [ICMPV6_DEST_UNREACH] = "DestUnreachs",
 107         [ICMPV6_PKT_TOOBIG] = "PktTooBigs",
 108         [ICMPV6_TIME_EXCEED] = "TimeExcds",
 109         [ICMPV6_PARAMPROB] = "ParmProblems",
 110         [ICMPV6_ECHO_REQUEST] = "Echos",
 111         [ICMPV6_ECHO_REPLY] = "EchoReplies",
 112         [ICMPV6_MGM_QUERY] = "GroupMembQueries",
 113         [ICMPV6_MGM_REPORT] = "GroupMembResponses",
 114         [ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
 115         [ICMPV6_MLD2_REPORT] = "MLDv2Reports",
 116         [NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
 117         [NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
 118         [NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
 119         [NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
 120         [NDISC_REDIRECT] = "Redirects",
 121 };
 122
 123
 124 static const struct snmp_mib snmp6_udp6_list[] = {
 125         SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
 126         SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
 127         SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
 128         SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 129         SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 130         SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
 131         SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
 132         SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
 133         SNMP_MIB_SENTINEL
 134 };
 135
 136 static const struct snmp_mib snmp6_udplite6_list[] = {
 137         SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
 138         SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
 139         SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
 140         SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 141         SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 142         SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
 143         SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
 144         SNMP_MIB_SENTINEL
 145 };
 146
 147 static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
 148 {
 149         char name[32];
 150         int i;
 151
 152         /* print by name -- deprecated items */
 153         for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
 154                 int icmptype;
 155                 const char *p;
 156
 157                 icmptype = i & 0xff;
 158                 p = icmp6type2name[icmptype];
 159                 if (!p) /* don't print un-named types here */
 160                         continue;
 161                 snprintf(name, sizeof(name), "Icmp6%s%s",
 162                         i & 0x100 ? "Out" : "In", p);
 163                 seq_printf(seq, "%-32s\t%lu\n", name,
 164                            atomic_long_read(smib + i));
 165         }
 166
 167         /* print by number (nonzero only) - ICMPMsgStat format */
 168         for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
 169                 unsigned long val;
 170
 171                 val = atomic_long_read(smib + i);
 172                 if (!val)
 173                         continue;
 174                 snprintf(name, sizeof(name), "Icmp6%sType%u",
 175                         i & 0x100 ?  "Out" : "In", i & 0xff);
 176                 seq_printf(seq, "%-32s\t%lu\n", name, val);
 177         }
 178 }
 179
 180 /* can be called either with percpu mib (pcpumib != NULL),
 181  * or shared one (smib != NULL)
 182  */
 183 static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
 184                                 atomic_long_t *smib,
 185                                 const struct snmp_mib *itemlist)
 186 {
 187         unsigned long buff[SNMP_MIB_MAX];
 188         int i;
 189
 190         if (pcpumib) {
 191                 memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
 192
 193                 snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
 194                 for (i = 0; itemlist[i].name; i++)
 195                         seq_printf(seq, "%-32s\t%lu\n",
 196                                    itemlist[i].name, buff[i]);
 197         } else {
 198                 for (i = 0; itemlist[i].name; i++)
 199                         seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
 200                                    atomic_long_read(smib + itemlist[i].entry));
 201         }
 202 }
 203
 204 static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
 205                                   const struct snmp_mib *itemlist, size_t syncpoff)
 206 {
 207         u64 buff64[SNMP_MIB_MAX];
 208         int i;
 209
 210         memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);
 211
 212         snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
 213         for (i = 0; itemlist[i].name; i++)
 214                 seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
 215 }
 216
 217 static int snmp6_seq_show(struct seq_file *seq, void *v)
 218 {
 219         struct net *net = (struct net *)seq->private;
 220
 221         snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
 222                             snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
 223         snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
 224                             NULL, snmp6_icmp6_list);
 225         snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
 226         snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
 227                             NULL, snmp6_udp6_list);
 228         snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
 229                             NULL, snmp6_udplite6_list);
 230         return 0;
 231 }
 232
 233 static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
 234 {
 235         struct inet6_dev *idev = (struct inet6_dev *)seq->private;
 236
 237         seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
 238         snmp6_seq_show_item64(seq, idev->stats.ipv6,
 239                             snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
 240         snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
 241                             snmp6_icmp6_list);
 242         snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
 243         return 0;
 244 }
 245
 246 int snmp6_register_dev(struct inet6_dev *idev)
 247 {
 248         struct proc_dir_entry *p;
 249         struct net *net;
 250
 251         if (!idev || !idev->dev)
 252                 return -EINVAL;
 253
 254         net = dev_net(idev->dev);
 255         if (!net->mib.proc_net_devsnmp6)
 256                 return -ENOENT;
 257
 258         p = proc_create_single_data(idev->dev->name, 0444,
 259                         net->mib.proc_net_devsnmp6, snmp6_dev_seq_show, idev);
 260         if (!p)
 261                 return -ENOMEM;
 262
 263         idev->stats.proc_dir_entry = p;
 264         return 0;
 265 }
 266
 267 int snmp6_unregister_dev(struct inet6_dev *idev)
 268 {
 269         struct net *net = dev_net(idev->dev);
 270         if (!net->mib.proc_net_devsnmp6)
 271                 return -ENOENT;
 272         if (!idev->stats.proc_dir_entry)
 273                 return -EINVAL;
 274         proc_remove(idev->stats.proc_dir_entry);
 275         idev->stats.proc_dir_entry = NULL;
 276         return 0;
 277 }
 278
 279 static int __net_init ipv6_proc_init_net(struct net *net)
 280 {
 281         if (!proc_create_net_single("sockstat6", 0444, net->proc_net,
 282                         sockstat6_seq_show, NULL))
 283                 return -ENOMEM;
 284
 285         if (!proc_create_net_single("snmp6", 0444, net->proc_net,
 286                         snmp6_seq_show, NULL))
 287                 goto proc_snmp6_fail;
 288
 289         net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
 290         if (!net->mib.proc_net_devsnmp6)
 291                 goto proc_dev_snmp6_fail;
 292         return 0;
 293
 294 proc_dev_snmp6_fail:
 295         remove_proc_entry("snmp6", net->proc_net);
 296 proc_snmp6_fail:
 297         remove_proc_entry("sockstat6", net->proc_net);
 298         return -ENOMEM;
 299 }
 300
 301 static void __net_exit ipv6_proc_exit_net(struct net *net)
 302 {
 303         remove_proc_entry("sockstat6", net->proc_net);
 304         remove_proc_entry("dev_snmp6", net->proc_net);
 305         remove_proc_entry("snmp6", net->proc_net);
 306 }
 307
 308 static struct pernet_operations ipv6_proc_ops = {
 309         .init = ipv6_proc_init_net,
 310         .exit = ipv6_proc_exit_net,
 311 };
 312
 313 int __init ipv6_misc_proc_init(void)
 314 {
 315         return register_pernet_subsys(&ipv6_proc_ops);
 316 }
 317
 318 void ipv6_misc_proc_exit(void)
 319 {
 320         unregister_pernet_subsys(&ipv6_proc_ops);
 321 }