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, 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_to = 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         }
 235
 236         port_to = port = ntohs(data.port);
 237         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 238                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 239                 if (port > port_to)
 240                         swap(port, port_to);
 241         }
 242
 243         if (retried)
 244                 ip = ntohl(h->next.ip);
 245         for (; !before(ip_to, ip); ip++) {
 246                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 247                                                        : port;
 248                 for (; p <= port_to; p++) {
 249                         data.ip = htonl(ip);
 250                         data.port = htons(p);
 251                         ret = adtfn(set, &data, timeout, flags);
 252
 253                         if (ret && !ip_set_eexist(ret, flags))
 254                                 return ret;
 255                         else
 256                                 ret = 0;
 257                 }
 258         }
 259         return ret;
 260 }
 261
 262 static bool
 263 hash_ipportip_same_set(const struct ip_set *a, const struct ip_set *b)
 264 {
 265         const struct ip_set_hash *x = a->data;
 266         const struct ip_set_hash *y = b->data;
 267
 268         /* Resizing changes htable_bits, so we ignore it */
 269         return x->maxelem == y->maxelem &&
 270                x->timeout == y->timeout;
 271 }
 272
 273 /* The type variant functions: IPv6 */
 274
 275 struct hash_ipportip6_elem {
 276         union nf_inet_addr ip;
 277         union nf_inet_addr ip2;
 278         __be16 port;
 279         u8 proto;
 280         u8 padding;
 281 };
 282
 283 struct hash_ipportip6_telem {
 284         union nf_inet_addr ip;
 285         union nf_inet_addr ip2;
 286         __be16 port;
 287         u8 proto;
 288         u8 padding;
 289         unsigned long timeout;
 290 };
 291
 292 static inline bool
 293 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
 294                           const struct hash_ipportip6_elem *ip2,
 295                           u32 *multi)
 296 {
 297         return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
 298                ipv6_addr_cmp(&ip1->ip2.in6, &ip2->ip2.in6) == 0 &&
 299                ip1->port == ip2->port &&
 300                ip1->proto == ip2->proto;
 301 }
 302
 303 static inline bool
 304 hash_ipportip6_data_isnull(const struct hash_ipportip6_elem *elem)
 305 {
 306         return elem->proto == 0;
 307 }
 308
 309 static inline void
 310 hash_ipportip6_data_copy(struct hash_ipportip6_elem *dst,
 311                          const struct hash_ipportip6_elem *src)
 312 {
 313         memcpy(dst, src, sizeof(*dst));
 314 }
 315
 316 static inline void
 317 hash_ipportip6_data_zero_out(struct hash_ipportip6_elem *elem)
 318 {
 319         elem->proto = 0;
 320 }
 321
 322 static bool
 323 hash_ipportip6_data_list(struct sk_buff *skb,
 324                          const struct hash_ipportip6_elem *data)
 325 {
 326         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 327             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
 328             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 329             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 330                 goto nla_put_failure;
 331         return 0;
 332
 333 nla_put_failure:
 334         return 1;
 335 }
 336
 337 static bool
 338 hash_ipportip6_data_tlist(struct sk_buff *skb,
 339                           const struct hash_ipportip6_elem *data)
 340 {
 341         const struct hash_ipportip6_telem *e =
 342                 (const struct hash_ipportip6_telem *)data;
 343
 344         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
 345             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
 346             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 347             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 348             nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
 349                           htonl(ip_set_timeout_get(e->timeout))))
 350                 goto nla_put_failure;
 351         return 0;
 352
 353 nla_put_failure:
 354         return 1;
 355 }
 356
 357 #undef PF
 358 #undef HOST_MASK
 359
 360 #define PF              6
 361 #define HOST_MASK       128
 362 #include <linux/netfilter/ipset/ip_set_ahash.h>
 363
 364 static inline void
 365 hash_ipportip6_data_next(struct ip_set_hash *h,
 366                          const struct hash_ipportip6_elem *d)
 367 {
 368         h->next.port = d->port;
 369 }
 370
 371 static int
 372 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 373                     const struct xt_action_param *par,
 374                     enum ipset_adt adt, const struct ip_set_adt_opt *opt)
 375 {
 376         const struct ip_set_hash *h = set->data;
 377         ipset_adtfn adtfn = set->variant->adt[adt];
 378         struct hash_ipportip6_elem data = { };
 379
 380         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 381                                  &data.port, &data.proto))
 382                 return -EINVAL;
 383
 384         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
 385         ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &data.ip2.in6);
 386
 387         return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
 388 }
 389
 390 static int
 391 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
 392                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 393 {
 394         const struct ip_set_hash *h = set->data;
 395         ipset_adtfn adtfn = set->variant->adt[adt];
 396         struct hash_ipportip6_elem data = { };
 397         u32 port, port_to;
 398         u32 timeout = h->timeout;
 399         bool with_ports = false;
 400         int ret;
 401
 402         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 403                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 404                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 405                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 406                      tb[IPSET_ATTR_IP_TO] ||
 407                      tb[IPSET_ATTR_CIDR]))
 408                 return -IPSET_ERR_PROTOCOL;
 409
 410         if (tb[IPSET_ATTR_LINENO])
 411                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 412
 413         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &data.ip);
 414         if (ret)
 415                 return ret;
 416
 417         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &data.ip2);
 418         if (ret)
 419                 return ret;
 420
 421         if (tb[IPSET_ATTR_PORT])
 422                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 423         else
 424                 return -IPSET_ERR_PROTOCOL;
 425
 426         if (tb[IPSET_ATTR_PROTO]) {
 427                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 428                 with_ports = ip_set_proto_with_ports(data.proto);
 429
 430                 if (data.proto == 0)
 431                         return -IPSET_ERR_INVALID_PROTO;
 432         } else
 433                 return -IPSET_ERR_MISSING_PROTO;
 434
 435         if (!(with_ports || data.proto == IPPROTO_ICMPV6))
 436                 data.port = 0;
 437
 438         if (tb[IPSET_ATTR_TIMEOUT]) {
 439                 if (!with_timeout(h->timeout))
 440                         return -IPSET_ERR_TIMEOUT;
 441                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 442         }
 443
 444         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 445                 ret = adtfn(set, &data, timeout, flags);
 446                 return ip_set_eexist(ret, flags) ? 0 : ret;
 447         }
 448
 449         port = ntohs(data.port);
 450         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 451         if (port > port_to)
 452                 swap(port, port_to);
 453
 454         if (retried)
 455                 port = ntohs(h->next.port);
 456         for (; port <= port_to; port++) {
 457                 data.port = htons(port);
 458                 ret = adtfn(set, &data, timeout, flags);
 459
 460                 if (ret && !ip_set_eexist(ret, flags))
 461                         return ret;
 462                 else
 463                         ret = 0;
 464         }
 465         return ret;
 466 }
 467
 468 /* Create hash:ip type of sets */
 469
 470 static int
 471 hash_ipportip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 472 {
 473         struct ip_set_hash *h;
 474         u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 475         u8 hbits;
 476         size_t hsize;
 477
 478         if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 479                 return -IPSET_ERR_INVALID_FAMILY;
 480
 481         if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
 482                      !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
 483                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 484                 return -IPSET_ERR_PROTOCOL;
 485
 486         if (tb[IPSET_ATTR_HASHSIZE]) {
 487                 hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
 488                 if (hashsize < IPSET_MIMINAL_HASHSIZE)
 489                         hashsize = IPSET_MIMINAL_HASHSIZE;
 490         }
 491
 492         if (tb[IPSET_ATTR_MAXELEM])
 493                 maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
 494
 495         h = kzalloc(sizeof(*h), GFP_KERNEL);
 496         if (!h)
 497                 return -ENOMEM;
 498
 499         h->maxelem = maxelem;
 500         get_random_bytes(&h->initval, sizeof(h->initval));
 501         h->timeout = IPSET_NO_TIMEOUT;
 502
 503         hbits = htable_bits(hashsize);
 504         hsize = htable_size(hbits);
 505         if (hsize == 0) {
 506                 kfree(h);
 507                 return -ENOMEM;
 508         }
 509         h->table = ip_set_alloc(hsize);
 510         if (!h->table) {
 511                 kfree(h);
 512                 return -ENOMEM;
 513         }
 514         h->table->htable_bits = hbits;
 515
 516         set->data = h;
 517
 518         if (tb[IPSET_ATTR_TIMEOUT]) {
 519                 h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 520
 521                 set->variant = set->family == NFPROTO_IPV4
 522                         ? &hash_ipportip4_tvariant : &hash_ipportip6_tvariant;
 523
 524                 if (set->family == NFPROTO_IPV4)
 525                         hash_ipportip4_gc_init(set);
 526                 else
 527                         hash_ipportip6_gc_init(set);
 528         } else {
 529                 set->variant = set->family == NFPROTO_IPV4
 530                         ? &hash_ipportip4_variant : &hash_ipportip6_variant;
 531         }
 532
 533         pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
 534                  set->name, jhash_size(h->table->htable_bits),
 535                  h->table->htable_bits, h->maxelem, set->data, h->table);
 536
 537         return 0;
 538 }
 539
 540 static struct ip_set_type hash_ipportip_type __read_mostly = {
 541         .name           = "hash:ip,port,ip",
 542         .protocol       = IPSET_PROTOCOL,
 543         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
 544         .dimension      = IPSET_DIM_THREE,
 545         .family         = NFPROTO_UNSPEC,
 546         .revision_min   = REVISION_MIN,
 547         .revision_max   = REVISION_MAX,
 548         .create         = hash_ipportip_create,
 549         .create_policy  = {
 550                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 551                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 552                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 553                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 554                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 555         },
 556         .adt_policy     = {
 557                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 558                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 559                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
 560                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 561                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 562                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 563                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 564                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 565                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 566         },
 567         .me             = THIS_MODULE,
 568 };
 569
 570 static int __init
 571 hash_ipportip_init(void)
 572 {
 573         return ip_set_type_register(&hash_ipportip_type);
 574 }
 575
 576 static void __exit
 577 hash_ipportip_fini(void)
 578 {
 579         ip_set_type_unregister(&hash_ipportip_type);
 580 }
 581
 582 module_init(hash_ipportip_init);
 583 module_exit(hash_ipportip_fini);