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#endif
 321        unsigned int i;
 322        int ret = -EINVAL;
 323
 324        if (unlikely(!hash_rnd_inited)) {
 325                get_random_bytes(&hash_rnd, sizeof(hash_rnd));
 326                hash_rnd_inited = true;
 327        }
 328        if (info->check_set & ~XT_RECENT_VALID_FLAGS) {
 329                pr_info("Unsupported user space flags (%08x)\n",
 330                        info->check_set);
 331                return -EINVAL;
 332        }
 333        if (hweight8(info->check_set &
 334                     (XT_RECENT_SET | XT_RECENT_REMOVE |
 335                      XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1)
 336                return -EINVAL;
 337        if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) &&
 338            (info->seconds || info->hit_count ||
 339            (info->check_set & XT_RECENT_MODIFIERS)))
 340                return -EINVAL;
 341        if ((info->check_set & XT_RECENT_REAP) && !info->seconds)
 342                return -EINVAL;
 343        if (info->hit_count > ip_pkt_list_tot) {
 344                pr_info("hitcount (%u) is larger than "
 345                        "packets to be remembered (%u)\n",
 346                        info->hit_count, ip_pkt_list_tot);
 347                return -EINVAL;
 348        }
 349        if (info->name[0] == '\0' ||
 350            strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN)
 351                return -EINVAL;
 352
 353        mutex_lock(&recent_mutex);
 354        t = recent_table_lookup(recent_net, info->name);
 355        if (t != NULL) {
 356                t->refcnt++;
 357                ret = 0;
 358                goto out;
 359        }
 360
 361        t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size,
 362                    GFP_KERNEL);
 363        if (t == NULL) {
 364                ret = -ENOMEM;
 365                goto out;
 366        }
 367        t->refcnt = 1;
 368
 369        memcpy(&t->mask, &info->mask, sizeof(t->mask));
 370        strcpy(t->name, info->name);
 371        INIT_LIST_HEAD(&t->lru_list);
 372        for (i = 0; i < ip_list_hash_size; i++)
 373                INIT_LIST_HEAD(&t->iphash[i]);
 374#ifdef CONFIG_PROC_FS
 375        pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent,
 376                  &recent_mt_fops, t);
 377        if (pde == NULL) {
 378                kfree(t);
 379                ret = -ENOMEM;
 380                goto out;
 381        }
 382        pde->uid = ip_list_uid;
 383        pde->gid = ip_list_gid;
 384#endif
 385        spin_lock_bh(&recent_lock);
 386        list_add_tail(&t->list, &recent_net->tables);
 387        spin_unlock_bh(&recent_lock);
 388        ret = 0;
 389out:
 390        mutex_unlock(&recent_mutex);
 391        return ret;
 392}
 393
 394static int recent_mt_check_v0(const struct xt_mtchk_param *par)
 395{
 396        const struct xt_recent_mtinfo_v0 *info_v0 = par->matchinfo;
 397        struct xt_recent_mtinfo_v1 info_v1;
 398
 399        /* Copy revision 0 structure to revision 1 */
 400        memcpy(&info_v1, info_v0, sizeof(struct xt_recent_mtinfo));
 401        /* Set default mask to ensure backward compatible behaviour */
 402        memset(info_v1.mask.all, 0xFF, sizeof(info_v1.mask.all));
 403
 404        return recent_mt_check(par, &info_v1);
 405}
 406
 407static int recent_mt_check_v1(const struct xt_mtchk_param *par)
 408{
 409        return recent_mt_check(par, par->matchinfo);
 410}
 411
 412static void recent_mt_destroy(const struct xt_mtdtor_param *par)
 413{
 414        struct recent_net *recent_net = recent_pernet(par->net);
 415        const struct xt_recent_mtinfo_v1 *info = par->matchinfo;
 416        struct recent_table *t;
 417
 418        mutex_lock(&recent_mutex);
 419        t = recent_table_lookup(recent_net, info->name);
 420        if (--t->refcnt == 0) {
 421                spin_lock_bh(&recent_lock);
 422                list_del(&t->list);
 423                spin_unlock_bh(&recent_lock);
 424#ifdef CONFIG_PROC_FS
 425                remove_proc_entry(t->name, recent_net->xt_recent);
 426#endif
 427                recent_table_flush(t);
 428                kfree(t);
 429        }
 430        mutex_unlock(&recent_mutex);
 431}
 432
 433#ifdef CONFIG_PROC_FS
 434struct recent_iter_state {
 435        const struct recent_table *table;
 436        unsigned int            bucket;
 437};
 438
 439static void *recent_seq_start(struct seq_file *seq, loff_t *pos)
 440        __acquires(recent_lock)
 441{
 442        struct recent_iter_state *st = seq->private;
 443        const struct recent_table *t = st->table;
 444        struct recent_entry *e;
 445        loff_t p = *pos;
 446
 447        spin_lock_bh(&recent_lock);
 448
 449        for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++)
 450                list_for_each_entry(e, &t->iphash[st->bucket], list)
 451                        if (p-- == 0)
 452                                return e;
 453        return NULL;
 454}
 455
 456static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 457{
 458        struct recent_iter_state *st = seq->private;
 459        const struct recent_table *t = st->table;
 460        const struct recent_entry *e = v;
 461        const struct list_head *head = e->list.next;
 462
 463        while (head == &t->iphash[st->bucket]) {
 464                if (++st->bucket >= ip_list_hash_size)
 465                        return NULL;
 466                head = t->iphash[st->bucket].next;
 467        }
 468        (*pos)++;
 469        return list_entry(head, struct recent_entry, list);
 470}
 471
 472static void recent_seq_stop(struct seq_file *s, void *v)
 473        __releases(recent_lock)
 474{
 475        spin_unlock_bh(&recent_lock);
 476}
 477
 478static int recent_seq_show(struct seq_file *seq, void *v)
 479{
 480        const struct recent_entry *e = v;
 481        unsigned int i;
 482
 483        i = (e->index - 1) % ip_pkt_list_tot;
 484        if (e->family == NFPROTO_IPV4)
 485                seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u",
 486                           &e->addr.ip, e->ttl, e->stamps[i], e->index);
 487        else
 488                seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u",
 489                           &e->addr.in6, e->ttl, e->stamps[i], e->index);
 490        for (i = 0; i < e->nstamps; i++)
 491                seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]);
 492        seq_printf(seq, "\n");
 493        return 0;
 494}
 495
 496static const struct seq_operations recent_seq_ops = {
 497        .start          = recent_seq_start,
 498        .next           = recent_seq_next,
 499        .stop           = recent_seq_stop,
 500        .show           = recent_seq_show,
 501};
 502
 503static int recent_seq_open(struct inode *inode, struct file *file)
 504{
 505        struct proc_dir_entry *pde = PDE(inode);
 506        struct recent_iter_state *st;
 507
 508        st = __seq_open_private(file, &recent_seq_ops, sizeof(*st));
 509        if (st == NULL)
 510                return -ENOMEM;
 511
 512        st->table    = pde->data;
 513        return 0;
 514}
 515
 516static ssize_t
 517recent_mt_proc_write(struct file *file, const char __user *input,
 518                     size_t size, loff_t *loff)
 519{
 520        const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
 521        struct recent_table *t = pde->data;
 522        struct recent_entry *e;
 523        char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")];
 524        const char *c = buf;
 525        union nf_inet_addr addr = {};
 526        u_int16_t family;
 527        bool add, succ;
 528
 529        if (size == 0)
 530                return 0;
 531        if (size > sizeof(buf))
 532                size = sizeof(buf);
 533        if (copy_from_user(buf, input, size) != 0)
 534                return -EFAULT;
 535
 536        /* Strict protocol! */
 537        if (*loff != 0)
 538                return -ESPIPE;
 539        switch (*c) {
 540        case '/': /* flush table */
 541                spin_lock_bh(&recent_lock);
 542                recent_table_flush(t);
 543                spin_unlock_bh(&recent_lock);
 544                return size;
 545        case '-': /* remove address */
 546                add = false;
 547                break;
 548        case '+': /* add address */
 549                add = true;
 550                break;
 551        default:
 552                pr_info("Need \"+ip\", \"-ip\" or \"/\"\n");
 553                return -EINVAL;
 554        }
 555
 556        ++c;
 557        --size;
 558        if (strnchr(c, size, ':') != NULL) {
 559                family = NFPROTO_IPV6;
 560                succ   = in6_pton(c, size, (void *)&addr, '\n', NULL);
 561        } else {
 562                family = NFPROTO_IPV4;
 563                succ   = in4_pton(c, size, (void *)&addr, '\n', NULL);
 564        }
 565
 566        if (!succ) {
 567                pr_info("illegal address written to procfs\n");
 568                return -EINVAL;
 569        }
 570
 571        spin_lock_bh(&recent_lock);
 572        e = recent_entry_lookup(t, &addr, family, 0);
 573        if (e == NULL) {
 574                if (add)
 575                        recent_entry_init(t, &addr, family, 0);
 576        } else {
 577                if (add)
 578                        recent_entry_update(t, e);
 579                else
 580                        recent_entry_remove(t, e);
 581        }
 582        spin_unlock_bh(&recent_lock);
 583        /* Note we removed one above */
 584        *loff += size + 1;
 585        return size + 1;
 586}
 587
 588static const struct file_operations recent_mt_fops = {
 589        .open    = recent_seq_open,
 590        .read    = seq_read,
 591        .write   = recent_mt_proc_write,
 592        .release = seq_release_private,
 593        .owner   = THIS_MODULE,
 594        .llseek = seq_lseek,
 595};
 596
 597static int __net_init recent_proc_net_init(struct net *net)
 598{
 599        struct recent_net *recent_net = recent_pernet(net);
 600
 601        recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net);
 602        if (!recent_net->xt_recent)
 603                return -ENOMEM;
 604        return 0;
 605}
 606
 607static void __net_exit recent_proc_net_exit(struct net *net)
 608{
 609        proc_net_remove(net, "xt_recent");
 610}
 611#else
 612static inline int recent_proc_net_init(struct net *net)
 613{
 614        return 0;
 615}
 616
 617static inline void recent_proc_net_exit(struct net *net)
 618{
 619}
 620#endif /* CONFIG_PROC_FS */
 621
 622static int __net_init recent_net_init(struct net *net)
 623{
 624        struct recent_net *recent_net = recent_pernet(net);
 625
 626        INIT_LIST_HEAD(&recent_net->tables);
 627        return recent_proc_net_init(net);
 628}
 629
 630static void __net_exit recent_net_exit(struct net *net)
 631{
 632        struct recent_net *recent_net = recent_pernet(net);
 633
 634        BUG_ON(!list_empty(&recent_net->tables));
 635        recent_proc_net_exit(net);
 636}
 637
 638static struct pernet_operations recent_net_ops = {
 639        .init   = recent_net_init,
 640        .exit   = recent_net_exit,
 641        .id     = &recent_net_id,
 642        .size   = sizeof(struct recent_net),
 643};
 644
 645static struct xt_match recent_mt_reg[] __read_mostly = {
 646        {
 647                .name       = "recent",
 648                .revision   = 0,
 649                .family     = NFPROTO_IPV4,
 650                .match      = recent_mt,
 651                .matchsize  = sizeof(struct xt_recent_mtinfo),
 652                .checkentry = recent_mt_check_v0,
 653                .destroy    = recent_mt_destroy,
 654                .me         = THIS_MODULE,
 655        },
 656        {
 657                .name       = "recent",
 658                .revision   = 0,
 659                .family     = NFPROTO_IPV6,
 660                .match      = recent_mt,
 661                .matchsize  = sizeof(struct xt_recent_mtinfo),
 662                .checkentry = recent_mt_check_v0,
 663                .destroy    = recent_mt_destroy,
 664                .me         = THIS_MODULE,
 665        },
 666        {
 667                .name       = "recent",
 668                .revision   = 1,
 669                .family     = NFPROTO_IPV4,
 670                .match      = recent_mt,
 671                .matchsize  = sizeof(struct xt_recent_mtinfo_v1),
 672                .checkentry = recent_mt_check_v1,
 673                .destroy    = recent_mt_destroy,
 674                .me         = THIS_MODULE,
 675        },
 676        {
 677                .name       = "recent",
 678                .revision   = 1,
 679                .family     = NFPROTO_IPV6,
 680                .match      = recent_mt,
 681                .matchsize  = sizeof(struct xt_recent_mtinfo_v1),
 682                .checkentry = recent_mt_check_v1,
 683                .destroy    = recent_mt_destroy,
 684                .me         = THIS_MODULE,
 685        }
 686};
 687
 688static int __init recent_mt_init(void)
 689{
 690        int err;
 691
 692        if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255)
 693                return -EINVAL;
 694        ip_list_hash_size = 1 << fls(ip_list_tot);
 695
 696        err = register_pernet_subsys(&recent_net_ops);
 697        if (err)
 698                return err;
 699        err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
 700        if (err)
 701                unregister_pernet_subsys(&recent_net_ops);
 702        return err;
 703}
 704
 705static void __exit recent_mt_exit(void)
 706{
 707        xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
 708        unregister_pernet_subsys(&recent_net_ops);
 709}
 710
 711module_init(recent_mt_init);
 712module_exit(recent_mt_exit);
 713
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