net/netfilter/ipset/ip_set_hash_ipportip.c

   1 /* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 as
   5  * published by the Free Software Foundation.
   6  */
   7
   8 /* Kernel module implementing an IP set type: the hash:ip,port,ip type */
   9
  10 #include <linux/jhash.h>
  11 #include <linux/module.h>
  12 #include <linux/ip.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/errno.h>
  15 #include <linux/random.h>
  16 #include <net/ip.h>
  17 #include <net/ipv6.h>
  18 #include <net/netlink.h>
  19 #include <net/tcp.h>
  20
  21 #include <linux/netfilter.h>
  22 #include <linux/netfilter/ipset/pfxlen.h>
  23 #include <linux/netfilter/ipset/ip_set.h>
  24 #include <linux/netfilter/ipset/ip_set_timeout.h>
  25 #include <linux/netfilter/ipset/ip_set_getport.h>
  26 #include <linux/netfilter/ipset/ip_set_hash.h>
  27
  28 #define REVISION_MIN    0
  29 #define REVISION_MAX    1 /* SCTP and UDPLITE support added */
  30
  31 MODULE_LICENSE("GPL");
  32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  33 IP_SET_MODULE_DESC("hash:ip,port,ip", REVISION_MIN, REVISION_MAX);
  34 MODULE_ALIAS("ip_set_hash:ip,port,ip");
  35
  36 /* Type specific function prefix */
  37 #define TYPE            hash_ipportip
  38
  39 static bool
  40 hash_ipportip_same_set(const struct ip_set *a, const struct ip_set *b);
  41
  42 #define hash_ipportip4_same_set hash_ipportip_same_set
  43 #define hash_ipportip6_same_set hash_ipportip_same_set
  44
  45 /* The type variant functions: IPv4 */
  46
  47 /* Member elements without timeout */
  48 struct hash_ipportip4_elem {
  49         __be32 ip;
  50         __be32 ip2;
  51         __be16 port;
  52         u8 proto;
  53         u8 padding;
  54 };
  55
  56 /* Member elements with timeout support */
  57 struct hash_ipportip4_telem {
  58         __be32 ip;
  59         __be32 ip2;
  60         __be16 port;
  61         u8 proto;
  62         u8 padding;
  63         unsigned long timeout;
  64 };
  65
  66 static inline bool
  67 hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
  68                           const struct hash_ipportip4_elem *ip2,
  69                           u32 *multi)
  70 {
  71         return ip1->ip == ip2->ip &&
  72                ip1->ip2 == ip2->ip2 &&
  73                ip1->port == ip2->port &&
  74                ip1->proto == ip2->proto;
  75 }
  76
  77 static inline bool
  78 hash_ipportip4_data_isnull(const struct hash_ipportip4_elem *elem)
  79 {
  80         return elem->proto == 0;
  81 }
  82
  83 static inline void
  84 hash_ipportip4_data_copy(struct hash_ipportip4_elem *dst,
  85                          const struct hash_ipportip4_elem *src)
  86 {
  87         memcpy(dst, src, sizeof(*dst));
  88 }
  89
  90 static inline void
  91 hash_ipportip4_data_zero_out(struct hash_ipportip4_elem *elem)
  92 {
  93         elem->proto = 0;
  94 }
  95
  96 static bool
  97 hash_ipportip4_data_list(struct sk_buff *skb,
  98                        const struct hash_ipportip4_elem *data)
  99 {
 100         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 101             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
 102             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 103             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 104                 goto nla_put_failure;
 105         return 0;
 106
 107 nla_put_failure:
 108         return 1;
 109 }
 110
 111 static bool
 112 hash_ipportip4_data_tlist(struct sk_buff *skb,
 113                         const struct hash_ipportip4_elem *data)
 114 {
 115         const struct hash_ipportip4_telem *tdata =
 116                 (const struct hash_ipportip4_telem *)data;
 117
 118         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, tdata->ip) ||
 119             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, tdata->ip2) ||
 120             nla_put_net16(skb, IPSET_ATTR_PORT, tdata->port) ||
 121             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 122             nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
 123                           htonl(ip_set_timeout_get(tdata->timeout))))
 124                 goto nla_put_failure;
 125         return 0;
 126
 127 nla_put_failure:
 128         return 1;
 129 }
 130
 131 #define PF              4
 132 #define HOST_MASK       32
 133 #include <linux/netfilter/ipset/ip_set_ahash.h>
 134
 135 static inline void
 136 hash_ipportip4_data_next(struct ip_set_hash *h,
 137                          const struct hash_ipportip4_elem *d)
 138 {
 139         h->next.ip = d->ip;
 140         h->next.port = d->port;
 141 }
 142
 143 static int
 144 hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb,
 145                     const struct xt_action_param *par,
 146                     enum ipset_adt adt, const struct ip_set_adt_opt *opt)
 147 {
 148         const struct ip_set_hash *h = set->data;
 149         ipset_adtfn adtfn = set->variant->adt[adt];
 150         struct hash_ipportip4_elem data = { };
 151
 152         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 153                                  &data.port, &data.proto))
 154                 return -EINVAL;
 155
 156         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip);
 157         ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &data.ip2);
 158
 159         return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
 160 }
 161
 162 static int
 163 hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
 164                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 165 {
 166         const struct ip_set_hash *h = set->data;
 167         ipset_adtfn adtfn = set->variant->adt[adt];
 168         struct hash_ipportip4_elem data = { };
 169         u32 ip, ip_to = 0, p = 0, port, port_to;
 170         u32 timeout = h->timeout;
 171         bool with_ports = false;
 172         int ret;
 173
 174         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 175                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 176                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 177                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 178                 return -IPSET_ERR_PROTOCOL;
 179
 180         if (tb[IPSET_ATTR_LINENO])
 181                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 182
 183         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &data.ip);
 184         if (ret)
 185                 return ret;
 186
 187         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP2], &data.ip2);
 188         if (ret)
 189                 return ret;
 190
 191         if (tb[IPSET_ATTR_PORT])
 192                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 193         else
 194                 return -IPSET_ERR_PROTOCOL;
 195
 196         if (tb[IPSET_ATTR_PROTO]) {
 197                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 198                 with_ports = ip_set_proto_with_ports(data.proto);
 199
 200                 if (data.proto == 0)
 201                         return -IPSET_ERR_INVALID_PROTO;
 202         } else
 203                 return -IPSET_ERR_MISSING_PROTO;
 204
 205         if (!(with_ports || data.proto == IPPROTO_ICMP))
 206                 data.port = 0;
 207
 208         if (tb[IPSET_ATTR_TIMEOUT]) {
 209                 if (!with_timeout(h->timeout))
 210                         return -IPSET_ERR_TIMEOUT;
 211                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 212         }
 213
 214         if (adt == IPSET_TEST ||
 215             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
 216               tb[IPSET_ATTR_PORT_TO])) {
 217                 ret = adtfn(set, &data, timeout, flags);
 218                 return ip_set_eexist(ret, flags) ? 0 : ret;
 219         }
 220
 221         ip = ntohl(data.ip);
 222         if (tb[IPSET_ATTR_IP_TO]) {
 223                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 224                 if (ret)
 225                         return ret;
 226                 if (ip > ip_to)
 227                         swap(ip, ip_to);
 228         } else if (tb[IPSET_ATTR_CIDR]) {
 229                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 230
 231                 if (!cidr || cidr > 32)
 232                         return -IPSET_ERR_INVALID_CIDR;
 233                 ip_set_mask_from_to(ip, ip_to, cidr);
 234         } else
 235                 ip_to = ip;
 236
 237         port_to = port = ntohs(data.port);
 238         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 239                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 240                 if (port > port_to)
 241                         swap(port, port_to);
 242         }
 243
 244         if (retried)
 245                 ip = ntohl(h->next.ip);
 246         for (; !before(ip_to, ip); ip++) {
 247                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 248                                                        : port;
 249                 for (; p <= port_to; p++) {
 250                         data.ip = htonl(ip);
 251                         data.port = htons(p);
 252                         ret = adtfn(set, &data, timeout, flags);
 253
 254                         if (ret && !ip_set_eexist(ret, flags))
 255                                 return ret;
 256                         else
 257                                 ret = 0;
 258                 }
 259         }
 260         return ret;
 261 }
 262
 263 static bool
 264 hash_ipportip_same_set(const struct ip_set *a, const struct ip_set *b)
 265 {
 266         const struct ip_set_hash *x = a->data;
 267         const struct ip_set_hash *y = b->data;
 268
 269         /* Resizing changes htable_bits, so we ignore it */
 270         return x->maxelem == y->maxelem &&
 271                x->timeout == y->timeout;
 272 }
 273
 274 /* The type variant functions: IPv6 */
 275
 276 struct hash_ipportip6_elem {
 277         union nf_inet_addr ip;
 278         union nf_inet_addr ip2;
 279         __be16 port;
 280         u8 proto;
 281         u8 padding;
 282 };
 283
 284 struct hash_ipportip6_telem {
 285         union nf_inet_addr ip;
 286         union nf_inet_addr ip2;
 287         __be16 port;
 288         u8 proto;
 289         u8 padding;
 290         unsigned long timeout;
 291 };
 292
 293 static inline bool
 294 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
 295                           const struct hash_ipportip6_elem *ip2,
 296                           u32 *multi)
 297 {
 298         return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
 299                ipv6_addr_cmp(&ip1->ip2.in6, &ip2->ip2.in6) == 0 &&
 300                ip1->port == ip2->port &&
 301                ip1->proto == ip2->proto;
 302 }
 303
 304 static inline bool
 305 hash_ipportip6_data_isnull(const struct hash_ipportip6_elem *elem)
 306 {
 307         return elem->proto == 0;
 308 }
 309
 310 static inline void
 311 hash_ipportip6_data_copy(struct hash_ipportip6_elem *dst,
 312                          const struct hash_ipportip6_elem *src)
 313 {
 314         memcpy(dst, src, sizeof(*dst));
 315 }
 316
 317 static inline void
 318 hash_ipportip6_data_zero_out(struct hash_ipportip6_elem *elem)
 319 {
 320         elem->proto = 0;
 321 }
 322
 323 static bool
 324 hash_ipportip6_data_list(struct sk_buff *skb,
 325                          const struct hash_ipportip6_elem *data)
 326 {
 327         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 328             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
 329             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 330             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 331                 goto nla_put_failure;
 332         return 0;
 333
 334 nla_put_failure:
 335         return 1;
 336 }
 337
 338 static bool
 339 hash_ipportip6_data_tlist(struct sk_buff *skb,
 340                           const struct hash_ipportip6_elem *data)
 341 {
 342         const struct hash_ipportip6_telem *e =
 343                 (const struct hash_ipportip6_telem *)data;
 344
 345         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
 346             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
 347             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 348             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 349             nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
 350                           htonl(ip_set_timeout_get(e->timeout))))
 351                 goto nla_put_failure;
 352         return 0;
 353
 354 nla_put_failure:
 355         return 1;
 356 }
 357
 358 #undef PF
 359 #undef HOST_MASK
 360
 361 #define PF              6
 362 #define HOST_MASK       128
 363 #include <linux/netfilter/ipset/ip_set_ahash.h>
 364
 365 static inline void
 366 hash_ipportip6_data_next(struct ip_set_hash *h,
 367                          const struct hash_ipportip6_elem *d)
 368 {
 369         h->next.port = d->port;
 370 }
 371
 372 static int
 373 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 374                     const struct xt_action_param *par,
 375                     enum ipset_adt adt, const struct ip_set_adt_opt *opt)
 376 {
 377         const struct ip_set_hash *h = set->data;
 378         ipset_adtfn adtfn = set->variant->adt[adt];
 379         struct hash_ipportip6_elem data = { };
 380
 381         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 382                                  &data.port, &data.proto))
 383                 return -EINVAL;
 384
 385         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
 386         ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &data.ip2.in6);
 387
 388         return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
 389 }
 390
 391 static int
 392 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
 393                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 394 {
 395         const struct ip_set_hash *h = set->data;
 396         ipset_adtfn adtfn = set->variant->adt[adt];
 397         struct hash_ipportip6_elem data = { };
 398         u32 port, port_to;
 399         u32 timeout = h->timeout;
 400         bool with_ports = false;
 401         int ret;
 402
 403         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 404                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 405                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 406                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 407                      tb[IPSET_ATTR_IP_TO] ||
 408                      tb[IPSET_ATTR_CIDR]))
 409                 return -IPSET_ERR_PROTOCOL;
 410
 411         if (tb[IPSET_ATTR_LINENO])
 412                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 413
 414         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &data.ip);
 415         if (ret)
 416                 return ret;
 417
 418         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &data.ip2);
 419         if (ret)
 420                 return ret;
 421
 422         if (tb[IPSET_ATTR_PORT])
 423                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 424         else
 425                 return -IPSET_ERR_PROTOCOL;
 426
 427         if (tb[IPSET_ATTR_PROTO]) {
 428                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 429                 with_ports = ip_set_proto_with_ports(data.proto);
 430
 431                 if (data.proto == 0)
 432                         return -IPSET_ERR_INVALID_PROTO;
 433         } else
 434                 return -IPSET_ERR_MISSING_PROTO;
 435
 436         if (!(with_ports || data.proto == IPPROTO_ICMPV6))
 437                 data.port = 0;
 438
 439         if (tb[IPSET_ATTR_TIMEOUT]) {
 440                 if (!with_timeout(h->timeout))
 441                         return -IPSET_ERR_TIMEOUT;
 442                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 443         }
 444
 445         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 446                 ret = adtfn(set, &data, timeout, flags);
 447                 return ip_set_eexist(ret, flags) ? 0 : ret;
 448         }
 449
 450         port = ntohs(data.port);
 451         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 452         if (port > port_to)
 453                 swap(port, port_to);
 454
 455         if (retried)
 456                 port = ntohs(h->next.port);
 457         for (; port <= port_to; port++) {
 458                 data.port = htons(port);
 459                 ret = adtfn(set, &data, timeout, flags);
 460
 461                 if (ret && !ip_set_eexist(ret, flags))
 462                         return ret;
 463                 else
 464                         ret = 0;
 465         }
 466         return ret;
 467 }
 468
 469 /* Create hash:ip type of sets */
 470
 471 static int
 472 hash_ipportip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 473 {
 474         struct ip_set_hash *h;
 475         u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 476         u8 hbits;
 477         size_t hsize;
 478
 479         if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 480                 return -IPSET_ERR_INVALID_FAMILY;
 481
 482         if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
 483                      !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
 484                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 485                 return -IPSET_ERR_PROTOCOL;
 486
 487         if (tb[IPSET_ATTR_HASHSIZE]) {
 488                 hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
 489                 if (hashsize < IPSET_MIMINAL_HASHSIZE)
 490                         hashsize = IPSET_MIMINAL_HASHSIZE;
 491         }
 492
 493         if (tb[IPSET_ATTR_MAXELEM])
 494                 maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
 495
 496         h = kzalloc(sizeof(*h), GFP_KERNEL);
 497         if (!h)
 498                 return -ENOMEM;
 499
 500         h->maxelem = maxelem;
 501         get_random_bytes(&h->initval, sizeof(h->initval));
 502         h->timeout = IPSET_NO_TIMEOUT;
 503
 504         hbits = htable_bits(hashsize);
 505         hsize = htable_size(hbits);
 506         if (hsize == 0) {
 507                 kfree(h);
 508                 return -ENOMEM;
 509         }
 510         h->table = ip_set_alloc(hsize);
 511         if (!h->table) {
 512                 kfree(h);
 513                 return -ENOMEM;
 514         }
 515         h->table->htable_bits = hbits;
 516
 517         set->data = h;
 518
 519         if (tb[IPSET_ATTR_TIMEOUT]) {
 520                 h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 521
 522                 set->variant = set->family == NFPROTO_IPV4
 523                         ? &hash_ipportip4_tvariant : &hash_ipportip6_tvariant;
 524
 525                 if (set->family == NFPROTO_IPV4)
 526                         hash_ipportip4_gc_init(set);
 527                 else
 528                         hash_ipportip6_gc_init(set);
 529         } else {
 530                 set->variant = set->family == NFPROTO_IPV4
 531                         ? &hash_ipportip4_variant : &hash_ipportip6_variant;
 532         }
 533
 534         pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
 535                  set->name, jhash_size(h->table->htable_bits),
 536                  h->table->htable_bits, h->maxelem, set->data, h->table);
 537
 538         return 0;
 539 }
 540
 541 static struct ip_set_type hash_ipportip_type __read_mostly = {
 542         .name           = "hash:ip,port,ip",
 543         .protocol       = IPSET_PROTOCOL,
 544         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
 545         .dimension      = IPSET_DIM_THREE,
 546         .family         = NFPROTO_UNSPEC,
 547         .revision_min   = REVISION_MIN,
 548         .revision_max   = REVISION_MAX,
 549         .create         = hash_ipportip_create,
 550         .create_policy  = {
 551                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 552                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 553                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 554                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 555                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 556         },
 557         .adt_policy     = {
 558                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 559                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 560                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
 561                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 562                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 563                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 564                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 565                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 566                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 567         },
 568         .me             = THIS_MODULE,
 569 };
 570
 571 static int __init
 572 hash_ipportip_init(void)
 573 {
 574         return ip_set_type_register(&hash_ipportip_type);
 575 }
 576
 577 static void __exit
 578 hash_ipportip_fini(void)
 579 {
 580         ip_set_type_unregister(&hash_ipportip_type);
 581 }
 582
 583 module_init(hash_ipportip_init);
 584 module_exit(hash_ipportip_fini);