linux/net/netfilter/xt_recent.c
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   1/*
   2 * Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
   3 * Copyright © CC Computer Consultants GmbH, 2007 - 2008
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License version 2 as
   7 * published by the Free Software Foundation.
   8 *
   9 * This is a replacement of the old ipt_recent module, which carried the
  10 * following copyright notice:
  11 *
  12 * Author: Stephen Frost <sfrost@snowman.net>
  13 * Copyright 2002-2003, Stephen Frost, 2.5.x port by laforge@netfilter.org
  14 */
  15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16#include <linux/init.h>
  17#include <linux/ip.h>
  18#include <linux/ipv6.h>
  19#include <linux/module.h>
  20#include <linux/moduleparam.h>
  21#include <linux/proc_fs.h>
  22#include <linux/seq_file.h>
  23#include <linux/string.h>
  24#include <linux/ctype.h>
  25#include <linux/list.h>
  26#include <linux/random.h>
  27#include <linux/jhash.h>
  28#include <linux/bitops.h>
  29#include <linux/skbuff.h>
  30#include <linux/inet.h>
  31#include <linux/slab.h>
  32#include <net/net_namespace.h>
  33#include <net/netns/generic.h>
  34
  35#include <linux/netfilter/x_tables.h>
  36#include <linux/netfilter/xt_recent.h>
  37
  38MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  39MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
  40MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching");
  41MODULE_LICENSE("GPL");
  42MODULE_ALIAS("ipt_recent");
  43MODULE_ALIAS("ip6t_recent");
  44
  45static unsigned int ip_list_tot = 100;
  46static unsigned int ip_pkt_list_tot = 20;
  47static unsigned int ip_list_hash_size = 0;
  48static unsigned int ip_list_perms = 0644;
  49static unsigned int ip_list_uid = 0;
  50static unsigned int ip_list_gid = 0;
  51module_param(ip_list_tot, uint, 0400);
  52module_param(ip_pkt_list_tot, uint, 0400);
  53module_param(ip_list_hash_size, uint, 0400);
  54module_param(ip_list_perms, uint, 0400);
  55module_param(ip_list_uid, uint, S_IRUGO | S_IWUSR);
  56module_param(ip_list_gid, uint, S_IRUGO | S_IWUSR);
  57MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list");
  58MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)");
  59MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs");
  60MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files");
  61MODULE_PARM_DESC(ip_list_uid, "default owner of /proc/net/xt_recent/* files");
  62MODULE_PARM_DESC(ip_list_gid, "default owning group of /proc/net/xt_recent/* files");
  63
  64struct recent_entry {
  65        struct list_head        list;
  66        struct list_head        lru_list;
  67        union nf_inet_addr      addr;
  68        u_int16_t               family;
  69        u_int8_t                ttl;
  70        u_int8_t                index;
  71        u_int16_t               nstamps;
  72        unsigned long           stamps[0];
  73};
  74
  75struct recent_table {
  76        struct list_head        list;
  77        char                    name[XT_RECENT_NAME_LEN];
  78        union nf_inet_addr      mask;
  79        unsigned int            refcnt;
  80        unsigned int            entries;
  81        struct list_head        lru_list;
  82        struct list_head        iphash[0];
  83};
  84
  85struct recent_net {
  86        struct list_head        tables;
  87#ifdef CONFIG_PROC_FS
  88        struct proc_dir_entry   *xt_recent;
  89#endif
  90};
  91
  92static int recent_net_id;
  93static inline struct recent_net *recent_pernet(struct net *net)
  94{
  95        return net_generic(net, recent_net_id);
  96}
  97
  98static DEFINE_SPINLOCK(recent_lock);
  99static DEFINE_MUTEX(recent_mutex);
 100
 101#ifdef CONFIG_PROC_FS
 102static const struct file_operations recent_old_fops, recent_mt_fops;
 103#endif
 104
 105static u_int32_t hash_rnd __read_mostly;
 106static bool hash_rnd_inited __read_mostly;
 107
 108static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr)
 109{
 110        return jhash_1word((__force u32)addr->ip, hash_rnd) &
 111               (ip_list_hash_size - 1);
 112}
 113
 114static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr)
 115{
 116        return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) &
 117               (ip_list_hash_size - 1);
 118}
 119
 120static struct recent_entry *
 121recent_entry_lookup(const struct recent_table *table,
 122                    const union nf_inet_addr *addrp, u_int16_t family,
 123                    u_int8_t ttl)
 124{
 125        struct recent_entry *e;
 126        unsigned int h;
 127
 128        if (family == NFPROTO_IPV4)
 129                h = recent_entry_hash4(addrp);
 130        else
 131                h = recent_entry_hash6(addrp);
 132
 133        list_for_each_entry(e, &table->iphash[h], list)
 134                if (e->family == family &&
 135                    memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 &&
 136                    (ttl == e->ttl || ttl == 0 || e->ttl == 0))
 137                        return e;
 138        return NULL;
 139}
 140
 141static void recent_entry_remove(struct recent_table *t, struct recent_entry *e)
 142{
 143        list_del(&e->list);
 144        list_del(&e->lru_list);
 145        kfree(e);
 146        t->entries--;
 147}
 148
 149/*
 150 * Drop entries with timestamps older then 'time'.
 151 */
 152static void recent_entry_reap(struct recent_table *t, unsigned long time)
 153{
 154        struct recent_entry *e;
 155
 156        /*
 157         * The head of the LRU list is always the oldest entry.
 158         */
 159        e = list_entry(t->lru_list.next, struct recent_entry, lru_list);
 160
 161        /*
 162         * The last time stamp is the most recent.
 163         */
 164        if (time_after(time, e->stamps[e->index-1]))
 165                recent_entry_remove(t, e);
 166}
 167
 168static struct recent_entry *
 169recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr,
 170                  u_int16_t family, u_int8_t ttl)
 171{
 172        struct recent_entry *e;
 173
 174        if (t->entries >= ip_list_tot) {
 175                e = list_entry(t->lru_list.next, struct recent_entry, lru_list);
 176                recent_entry_remove(t, e);
 177        }
 178        e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot,
 179                    GFP_ATOMIC);
 180        if (e == NULL)
 181                return NULL;
 182        memcpy(&e->addr, addr, sizeof(e->addr));
 183        e->ttl       = ttl;
 184        e->stamps[0] = jiffies;
 185        e->nstamps   = 1;
 186        e->index     = 1;
 187        e->family    = family;
 188        if (family == NFPROTO_IPV4)
 189                list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]);
 190        else
 191                list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]);
 192        list_add_tail(&e->lru_list, &t->lru_list);
 193        t->entries++;
 194        return e;
 195}
 196
 197static void recent_entry_update(struct recent_table *t, struct recent_entry *e)
 198{
 199        e->index %= ip_pkt_list_tot;
 200        e->stamps[e->index++] = jiffies;
 201        if (e->index > e->nstamps)
 202                e->nstamps = e->index;
 203        list_move_tail(&e->lru_list, &t->lru_list);
 204}
 205
 206static struct recent_table *recent_table_lookup(struct recent_net *recent_net,
 207                                                const char *name)
 208{
 209        struct recent_table *t;
 210
 211        list_for_each_entry(t, &recent_net->tables, list)
 212                if (!strcmp(t->name, name))
 213                        return t;
 214        return NULL;
 215}
 216
 217static void recent_table_flush(struct recent_table *t)
 218{
 219        struct recent_entry *e, *next;
 220        unsigned int i;
 221
 222        for (i = 0; i < ip_list_hash_size; i++)
 223                list_for_each_entry_safe(e, next, &t->iphash[i], list)
 224                        recent_entry_remove(t, e);
 225}
 226
 227static bool
 228recent_mt(const struct sk_buff *skb, struct xt_action_param *par)
 229{
 230        struct net *net = dev_net(par->in ? par->in : par->out);
 231        struct recent_net *recent_net = recent_pernet(net);
 232        const struct xt_recent_mtinfo_v1 *info = par->matchinfo;
 233        struct recent_table *t;
 234        struct recent_entry *e;
 235        union nf_inet_addr addr = {}, addr_mask;
 236        u_int8_t ttl;
 237        bool ret = info->invert;
 238
 239        if (par->family == NFPROTO_IPV4) {
 240                const struct iphdr *iph = ip_hdr(skb);
 241
 242                if (info->side == XT_RECENT_DEST)
 243                        addr.ip = iph->daddr;
 244                else
 245                        addr.ip = iph->saddr;
 246
 247                ttl = iph->ttl;
 248        } else {
 249                const struct ipv6hdr *iph = ipv6_hdr(skb);
 250
 251                if (info->side == XT_RECENT_DEST)
 252                        memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6));
 253                else
 254                        memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6));
 255
 256                ttl = iph->hop_limit;
 257        }
 258
 259        /* use TTL as seen before forwarding */
 260        if (par->out != NULL && skb->sk == NULL)
 261                ttl++;
 262
 263        spin_lock_bh(&recent_lock);
 264        t = recent_table_lookup(recent_net, info->name);
 265
 266        nf_inet_addr_mask(&addr, &addr_mask, &t->mask);
 267
 268        e = recent_entry_lookup(t, &addr_mask, par->family,
 269                                (info->check_set & XT_RECENT_TTL) ? ttl : 0);
 270        if (e == NULL) {
 271                if (!(info->check_set & XT_RECENT_SET))
 272                        goto out;
 273                e = recent_entry_init(t, &addr_mask, par->family, ttl);
 274                if (e == NULL)
 275                        par->hotdrop = true;
 276                ret = !ret;
 277                goto out;
 278        }
 279
 280        if (info->check_set & XT_RECENT_SET)
 281                ret = !ret;
 282        else if (info->check_set & XT_RECENT_REMOVE) {
 283                recent_entry_remove(t, e);
 284                ret = !ret;
 285        } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) {
 286                unsigned long time = jiffies - info->seconds * HZ;
 287                unsigned int i, hits = 0;
 288
 289                for (i = 0; i < e->nstamps; i++) {
 290                        if (info->seconds && time_after(time, e->stamps[i]))
 291                                continue;
 292                        if (!info->hit_count || ++hits >= info->hit_count) {
 293                                ret = !ret;
 294                                break;
 295                        }
 296                }
 297
 298                /* info->seconds must be non-zero */
 299                if (info->check_set & XT_RECENT_REAP)
 300                        recent_entry_reap(t, time);
 301        }
 302
 303        if (info->check_set & XT_RECENT_SET ||
 304            (info->check_set & XT_RECENT_UPDATE && ret)) {
 305                recent_entry_update(t, e);
 306                e->ttl = ttl;
 307        }
 308out:
 309        spin_unlock_bh(&recent_lock);
 310        return ret;
 311}
 312
 313static int recent_mt_check(const struct xt_mtchk_param *par,
 314                           const struct xt_recent_mtinfo_v1 *info)
 315{
 316        struct recent_net *recent_net = recent_pernet(par->net);
 317        struct recent_table *t;
 318#ifdef CONFIG_PROC_FS
 319        struct proc_dir_entry *pde;
 320        kuid_t uid;
 321        kgid_t gid;
 322#endif
 323        unsigned int i;
 324        int ret = -EINVAL;
 325
 326        if (unlikely(!hash_rnd_inited)) {
 327                get_random_bytes(&hash_rnd, sizeof(hash_rnd));
 328                hash_rnd_inited = true;
 329        }
 330        if (info->check_set & ~XT_RECENT_VALID_FLAGS) {
 331                pr_info("Unsupported user space flags (%08x)\n",
 332                        info->check_set);
 333                return -EINVAL;
 334        }
 335        if (hweight8(info->check_set &
 336                     (XT_RECENT_SET | XT_RECENT_REMOVE |
 337                      XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1)
 338                return -EINVAL;
 339        if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) &&
 340            (info->seconds || info->hit_count ||
 341            (info->check_set & XT_RECENT_MODIFIERS)))
 342                return -EINVAL;
 343        if ((info->check_set & XT_RECENT_REAP) && !info->seconds)
 344                return -EINVAL;
 345        if (info->hit_count > ip_pkt_list_tot) {
 346                pr_info("hitcount (%u) is larger than "
 347                        "packets to be remembered (%u)\n",
 348                        info->hit_count, ip_pkt_list_tot);
 349                return -EINVAL;
 350        }
 351        if (info->name[0] == '\0' ||
 352            strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN)
 353                return -EINVAL;
 354
 355        mutex_lock(&recent_mutex);
 356        t = recent_table_lookup(recent_net, info->name);
 357        if (t != NULL) {
 358                t->refcnt++;
 359                ret = 0;
 360                goto out;
 361        }
 362
 363        t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size,
 364                    GFP_KERNEL);
 365        if (t == NULL) {
 366                ret = -ENOMEM;
 367                goto out;
 368        }
 369        t->refcnt = 1;
 370
 371        memcpy(&t->mask, &info->mask, sizeof(t->mask));
 372        strcpy(t->name, info->name);
 373        INIT_LIST_HEAD(&t->lru_list);
 374        for (i = 0; i < ip_list_hash_size; i++)
 375                INIT_LIST_HEAD(&t->iphash[i]);
 376#ifdef CONFIG_PROC_FS
 377        uid = make_kuid(&init_user_ns, ip_list_uid);
 378        gid = make_kgid(&init_user_ns, ip_list_gid);
 379        if (!uid_valid(uid) || !gid_valid(gid)) {
 380                kfree(t);
 381                ret = -EINVAL;
 382                goto out;
 383        }
 384        pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent,
 385                  &recent_mt_fops, t);
 386        if (pde == NULL) {
 387                kfree(t);
 388                ret = -ENOMEM;
 389                goto out;
 390        }
 391        pde->uid = uid;
 392        pde->gid = gid;
 393#endif
 394        spin_lock_bh(&recent_lock);
 395        list_add_tail(&t->list, &recent_net->tables);
 396        spin_unlock_bh(&recent_lock);
 397        ret = 0;
 398out:
 399        mutex_unlock(&recent_mutex);
 400        return ret;
 401}
 402
 403static int recent_mt_check_v0(const struct xt_mtchk_param *par)
 404{
 405        const struct xt_recent_mtinfo_v0 *info_v0 = par->matchinfo;
 406        struct xt_recent_mtinfo_v1 info_v1;
 407
 408        /* Copy revision 0 structure to revision 1 */
 409        memcpy(&info_v1, info_v0, sizeof(struct xt_recent_mtinfo));
 410        /* Set default mask to ensure backward compatible behaviour */
 411        memset(info_v1.mask.all, 0xFF, sizeof(info_v1.mask.all));
 412
 413        return recent_mt_check(par, &info_v1);
 414}
 415
 416static int recent_mt_check_v1(const struct xt_mtchk_param *par)
 417{
 418        return recent_mt_check(par, par->matchinfo);
 419}
 420
 421static void recent_mt_destroy(const struct xt_mtdtor_param *par)
 422{
 423        struct recent_net *recent_net = recent_pernet(par->net);
 424        const struct xt_recent_mtinfo_v1 *info = par->matchinfo;
 425        struct recent_table *t;
 426
 427        mutex_lock(&recent_mutex);
 428        t = recent_table_lookup(recent_net, info->name);
 429        if (--t->refcnt == 0) {
 430                spin_lock_bh(&recent_lock);
 431                list_del(&t->list);
 432                spin_unlock_bh(&recent_lock);
 433#ifdef CONFIG_PROC_FS
 434                remove_proc_entry(t->name, recent_net->xt_recent);
 435#endif
 436                recent_table_flush(t);
 437                kfree(t);
 438        }
 439        mutex_unlock(&recent_mutex);
 440}
 441
 442#ifdef CONFIG_PROC_FS
 443struct recent_iter_state {
 444        const struct recent_table *table;
 445        unsigned int            bucket;
 446};
 447
 448static void *recent_seq_start(struct seq_file *seq, loff_t *pos)
 449        __acquires(recent_lock)
 450{
 451        struct recent_iter_state *st = seq->private;
 452        const struct recent_table *t = st->table;
 453        struct recent_entry *e;
 454        loff_t p = *pos;
 455
 456        spin_lock_bh(&recent_lock);
 457
 458        for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++)
 459                list_for_each_entry(e, &t->iphash[st->bucket], list)
 460                        if (p-- == 0)
 461                                return e;
 462        return NULL;
 463}
 464
 465static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 466{
 467        struct recent_iter_state *st = seq->private;
 468        const struct recent_table *t = st->table;
 469        const struct recent_entry *e = v;
 470        const struct list_head *head = e->list.next;
 471
 472        while (head == &t->iphash[st->bucket]) {
 473                if (++st->bucket >= ip_list_hash_size)
 474                        return NULL;
 475                head = t->iphash[st->bucket].next;
 476        }
 477        (*pos)++;
 478        return list_entry(head, struct recent_entry, list);
 479}
 480
 481static void recent_seq_stop(struct seq_file *s, void *v)
 482        __releases(recent_lock)
 483{
 484        spin_unlock_bh(&recent_lock);
 485}
 486
 487static int recent_seq_show(struct seq_file *seq, void *v)
 488{
 489        const struct recent_entry *e = v;
 490        unsigned int i;
 491
 492        i = (e->index - 1) % ip_pkt_list_tot;
 493        if (e->family == NFPROTO_IPV4)
 494                seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u",
 495                           &e->addr.ip, e->ttl, e->stamps[i], e->index);
 496        else
 497                seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u",
 498                           &e->addr.in6, e->ttl, e->stamps[i], e->index);
 499        for (i = 0; i < e->nstamps; i++)
 500                seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]);
 501        seq_printf(seq, "\n");
 502        return 0;
 503}
 504
 505static const struct seq_operations recent_seq_ops = {
 506        .start          = recent_seq_start,
 507        .next           = recent_seq_next,
 508        .stop           = recent_seq_stop,
 509        .show           = recent_seq_show,
 510};
 511
 512static int recent_seq_open(struct inode *inode, struct file *file)
 513{
 514        struct proc_dir_entry *pde = PDE(inode);
 515        struct recent_iter_state *st;
 516
 517        st = __seq_open_private(file, &recent_seq_ops, sizeof(*st));
 518        if (st == NULL)
 519                return -ENOMEM;
 520
 521        st->table    = pde->data;
 522        return 0;
 523}
 524
 525static ssize_t
 526recent_mt_proc_write(struct file *file, const char __user *input,
 527                     size_t size, loff_t *loff)
 528{
 529        const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
 530        struct recent_table *t = pde->data;
 531        struct recent_entry *e;
 532        char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")];
 533        const char *c = buf;
 534        union nf_inet_addr addr = {};
 535        u_int16_t family;
 536        bool add, succ;
 537
 538        if (size == 0)
 539                return 0;
 540        if (size > sizeof(buf))
 541                size = sizeof(buf);
 542        if (copy_from_user(buf, input, size) != 0)
 543                return -EFAULT;
 544
 545        /* Strict protocol! */
 546        if (*loff != 0)
 547                return -ESPIPE;
 548        switch (*c) {
 549        case '/': /* flush table */
 550                spin_lock_bh(&recent_lock);
 551                recent_table_flush(t);
 552                spin_unlock_bh(&recent_lock);
 553                return size;
 554        case '-': /* remove address */
 555                add = false;
 556                break;
 557        case '+': /* add address */
 558                add = true;
 559                break;
 560        default:
 561                pr_info("Need \"+ip\", \"-ip\" or \"/\"\n");
 562                return -EINVAL;
 563        }
 564
 565        ++c;
 566        --size;
 567        if (strnchr(c, size, ':') != NULL) {
 568                family = NFPROTO_IPV6;
 569                succ   = in6_pton(c, size, (void *)&addr, '\n', NULL);
 570        } else {
 571                family = NFPROTO_IPV4;
 572                succ   = in4_pton(c, size, (void *)&addr, '\n', NULL);
 573        }
 574
 575        if (!succ) {
 576                pr_info("illegal address written to procfs\n");
 577                return -EINVAL;
 578        }
 579
 580        spin_lock_bh(&recent_lock);
 581        e = recent_entry_lookup(t, &addr, family, 0);
 582        if (e == NULL) {
 583                if (add)
 584                        recent_entry_init(t, &addr, family, 0);
 585        } else {
 586                if (add)
 587                        recent_entry_update(t, e);
 588                else
 589                        recent_entry_remove(t, e);
 590        }
 591        spin_unlock_bh(&recent_lock);
 592        /* Note we removed one above */
 593        *loff += size + 1;
 594        return size + 1;
 595}
 596
 597static const struct file_operations recent_mt_fops = {
 598        .open    = recent_seq_open,
 599        .read    = seq_read,
 600        .write   = recent_mt_proc_write,
 601        .release = seq_release_private,
 602        .owner   = THIS_MODULE,
 603        .llseek = seq_lseek,
 604};
 605
 606static int __net_init recent_proc_net_init(struct net *net)
 607{
 608        struct recent_net *recent_net = recent_pernet(net);
 609
 610        recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net);
 611        if (!recent_net->xt_recent)
 612                return -ENOMEM;
 613        return 0;
 614}
 615
 616static void __net_exit recent_proc_net_exit(struct net *net)
 617{
 618        proc_net_remove(net, "xt_recent");
 619}
 620#else
 621static inline int recent_proc_net_init(struct net *net)
 622{
 623        return 0;
 624}
 625
 626static inline void recent_proc_net_exit(struct net *net)
 627{
 628}
 629#endif /* CONFIG_PROC_FS */
 630
 631static int __net_init recent_net_init(struct net *net)
 632{
 633        struct recent_net *recent_net = recent_pernet(net);
 634
 635        INIT_LIST_HEAD(&recent_net->tables);
 636        return recent_proc_net_init(net);
 637}
 638
 639static void __net_exit recent_net_exit(struct net *net)
 640{
 641        struct recent_net *recent_net = recent_pernet(net);
 642
 643        BUG_ON(!list_empty(&recent_net->tables));
 644        recent_proc_net_exit(net);
 645}
 646
 647static struct pernet_operations recent_net_ops = {
 648        .init   = recent_net_init,
 649        .exit   = recent_net_exit,
 650        .id     = &recent_net_id,
 651        .size   = sizeof(struct recent_net),
 652};
 653
 654static struct xt_match recent_mt_reg[] __read_mostly = {
 655        {
 656                .name       = "recent",
 657                .revision   = 0,
 658                .family     = NFPROTO_IPV4,
 659                .match      = recent_mt,
 660                .matchsize  = sizeof(struct xt_recent_mtinfo),
 661                .checkentry = recent_mt_check_v0,
 662                .destroy    = recent_mt_destroy,
 663                .me         = THIS_MODULE,
 664        },
 665        {
 666                .name       = "recent",
 667                .revision   = 0,
 668                .family     = NFPROTO_IPV6,
 669                .match      = recent_mt,
 670                .matchsize  = sizeof(struct xt_recent_mtinfo),
 671                .checkentry = recent_mt_check_v0,
 672                .destroy    = recent_mt_destroy,
 673                .me         = THIS_MODULE,
 674        },
 675        {
 676                .name       = "recent",
 677                .revision   = 1,
 678                .family     = NFPROTO_IPV4,
 679                .match      = recent_mt,
 680                .matchsize  = sizeof(struct xt_recent_mtinfo_v1),
 681                .checkentry = recent_mt_check_v1,
 682                .destroy    = recent_mt_destroy,
 683                .me         = THIS_MODULE,
 684        },
 685        {
 686                .name       = "recent",
 687                .revision   = 1,
 688                .family     = NFPROTO_IPV6,
 689                .match      = recent_mt,
 690                .matchsize  = sizeof(struct xt_recent_mtinfo_v1),
 691                .checkentry = recent_mt_check_v1,
 692                .destroy    = recent_mt_destroy,
 693                .me         = THIS_MODULE,
 694        }
 695};
 696
 697static int __init recent_mt_init(void)
 698{
 699        int err;
 700
 701        if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255)
 702                return -EINVAL;
 703        ip_list_hash_size = 1 << fls(ip_list_tot);
 704
 705        err = register_pernet_subsys(&recent_net_ops);
 706        if (err)
 707                return err;
 708        err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
 709        if (err)
 710                unregister_pernet_subsys(&recent_net_ops);
 711        return err;
 712}
 713
 714static void __exit recent_mt_exit(void)
 715{
 716        xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
 717        unregister_pernet_subsys(&recent_net_ops);
 718}
 719
 720module_init(recent_mt_init);
 721module_exit(recent_mt_exit);
 722
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