net/netfilter/ipset/ip_set_hash_netport.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:net,port 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
  20 #include <linux/netfilter.h>
  21 #include <linux/netfilter/ipset/pfxlen.h>
  22 #include <linux/netfilter/ipset/ip_set.h>
  23 #include <linux/netfilter/ipset/ip_set_timeout.h>
  24 #include <linux/netfilter/ipset/ip_set_getport.h>
  25 #include <linux/netfilter/ipset/ip_set_hash.h>
  26
  27 MODULE_LICENSE("GPL");
  28 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  29 MODULE_DESCRIPTION("hash:net,port type of IP sets");
  30 MODULE_ALIAS("ip_set_hash:net,port");
  31
  32 /* Type specific function prefix */
  33 #define TYPE            hash_netport
  34
  35 static bool
  36 hash_netport_same_set(const struct ip_set *a, const struct ip_set *b);
  37
  38 #define hash_netport4_same_set  hash_netport_same_set
  39 #define hash_netport6_same_set  hash_netport_same_set
  40
  41 /* The type variant functions: IPv4 */
  42
  43 /* Member elements without timeout */
  44 struct hash_netport4_elem {
  45         __be32 ip;
  46         __be16 port;
  47         u8 proto;
  48         u8 cidr;
  49 };
  50
  51 /* Member elements with timeout support */
  52 struct hash_netport4_telem {
  53         __be32 ip;
  54         __be16 port;
  55         u8 proto;
  56         u8 cidr;
  57         unsigned long timeout;
  58 };
  59
  60 static inline bool
  61 hash_netport4_data_equal(const struct hash_netport4_elem *ip1,
  62                          const struct hash_netport4_elem *ip2)
  63 {
  64         return ip1->ip == ip2->ip &&
  65                ip1->port == ip2->port &&
  66                ip1->proto == ip2->proto &&
  67                ip1->cidr == ip2->cidr;
  68 }
  69
  70 static inline bool
  71 hash_netport4_data_isnull(const struct hash_netport4_elem *elem)
  72 {
  73         return elem->proto == 0;
  74 }
  75
  76 static inline void
  77 hash_netport4_data_copy(struct hash_netport4_elem *dst,
  78                         const struct hash_netport4_elem *src)
  79 {
  80         dst->ip = src->ip;
  81         dst->port = src->port;
  82         dst->proto = src->proto;
  83         dst->cidr = src->cidr;
  84 }
  85
  86 static inline void
  87 hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr)
  88 {
  89         elem->ip &= ip_set_netmask(cidr);
  90         elem->cidr = cidr;
  91 }
  92
  93 static inline void
  94 hash_netport4_data_zero_out(struct hash_netport4_elem *elem)
  95 {
  96         elem->proto = 0;
  97 }
  98
  99 static bool
 100 hash_netport4_data_list(struct sk_buff *skb,
 101                         const struct hash_netport4_elem *data)
 102 {
 103         NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, data->ip);
 104         NLA_PUT_NET16(skb, IPSET_ATTR_PORT, data->port);
 105         NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
 106         NLA_PUT_U8(skb, IPSET_ATTR_PROTO, data->proto);
 107         return 0;
 108
 109 nla_put_failure:
 110         return 1;
 111 }
 112
 113 static bool
 114 hash_netport4_data_tlist(struct sk_buff *skb,
 115                          const struct hash_netport4_elem *data)
 116 {
 117         const struct hash_netport4_telem *tdata =
 118                 (const struct hash_netport4_telem *)data;
 119
 120         NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, tdata->ip);
 121         NLA_PUT_NET16(skb, IPSET_ATTR_PORT, tdata->port);
 122         NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
 123         NLA_PUT_U8(skb, IPSET_ATTR_PROTO, data->proto);
 124         NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,
 125                       htonl(ip_set_timeout_get(tdata->timeout)));
 126
 127         return 0;
 128
 129 nla_put_failure:
 130         return 1;
 131 }
 132
 133 #define IP_SET_HASH_WITH_PROTO
 134 #define IP_SET_HASH_WITH_NETS
 135
 136 #define PF              4
 137 #define HOST_MASK       32
 138 #include <linux/netfilter/ipset/ip_set_ahash.h>
 139
 140 static int
 141 hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 142                    enum ipset_adt adt, u8 pf, u8 dim, u8 flags)
 143 {
 144         const struct ip_set_hash *h = set->data;
 145         ipset_adtfn adtfn = set->variant->adt[adt];
 146         struct hash_netport4_elem data = {
 147                 .cidr = h->nets[0].cidr || HOST_MASK };
 148
 149         if (data.cidr == 0)
 150                 return -EINVAL;
 151         if (adt == IPSET_TEST)
 152                 data.cidr = HOST_MASK;
 153
 154         if (!ip_set_get_ip4_port(skb, flags & IPSET_DIM_TWO_SRC,
 155                                  &data.port, &data.proto))
 156                 return -EINVAL;
 157
 158         ip4addrptr(skb, flags & IPSET_DIM_ONE_SRC, &data.ip);
 159         data.ip &= ip_set_netmask(data.cidr);
 160
 161         return adtfn(set, &data, h->timeout);
 162 }
 163
 164 static int
 165 hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
 166                    enum ipset_adt adt, u32 *lineno, u32 flags)
 167 {
 168         const struct ip_set_hash *h = set->data;
 169         ipset_adtfn adtfn = set->variant->adt[adt];
 170         struct hash_netport4_elem data = { .cidr = HOST_MASK };
 171         u32 port, port_to;
 172         u32 timeout = h->timeout;
 173         bool with_ports = false;
 174         int ret;
 175
 176         if (unlikely(!tb[IPSET_ATTR_IP] ||
 177                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 178                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 179                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 180                 return -IPSET_ERR_PROTOCOL;
 181
 182         if (tb[IPSET_ATTR_LINENO])
 183                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 184
 185         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &data.ip);
 186         if (ret)
 187                 return ret;
 188
 189         if (tb[IPSET_ATTR_CIDR])
 190                 data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 191         if (!data.cidr)
 192                 return -IPSET_ERR_INVALID_CIDR;
 193         data.ip &= ip_set_netmask(data.cidr);
 194
 195         if (tb[IPSET_ATTR_PORT])
 196                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 197         else
 198                 return -IPSET_ERR_PROTOCOL;
 199
 200         if (tb[IPSET_ATTR_PROTO]) {
 201                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 202                 with_ports = ip_set_proto_with_ports(data.proto);
 203
 204                 if (data.proto == 0)
 205                         return -IPSET_ERR_INVALID_PROTO;
 206         } else
 207                 return -IPSET_ERR_MISSING_PROTO;
 208
 209         if (!(with_ports || data.proto == IPPROTO_ICMP))
 210                 data.port = 0;
 211
 212         if (tb[IPSET_ATTR_TIMEOUT]) {
 213                 if (!with_timeout(h->timeout))
 214                         return -IPSET_ERR_TIMEOUT;
 215                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 216         }
 217
 218         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 219                 ret = adtfn(set, &data, timeout);
 220                 return ip_set_eexist(ret, flags) ? 0 : ret;
 221         }
 222
 223         port = ntohs(data.port);
 224         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 225         if (port > port_to)
 226                 swap(port, port_to);
 227
 228         for (; port <= port_to; port++) {
 229                 data.port = htons(port);
 230                 ret = adtfn(set, &data, timeout);
 231
 232                 if (ret && !ip_set_eexist(ret, flags))
 233                         return ret;
 234                 else
 235                         ret = 0;
 236         }
 237         return ret;
 238 }
 239
 240 static bool
 241 hash_netport_same_set(const struct ip_set *a, const struct ip_set *b)
 242 {
 243         const struct ip_set_hash *x = a->data;
 244         const struct ip_set_hash *y = b->data;
 245
 246         /* Resizing changes htable_bits, so we ignore it */
 247         return x->maxelem == y->maxelem &&
 248                x->timeout == y->timeout;
 249 }
 250
 251 /* The type variant functions: IPv6 */
 252
 253 struct hash_netport6_elem {
 254         union nf_inet_addr ip;
 255         __be16 port;
 256         u8 proto;
 257         u8 cidr;
 258 };
 259
 260 struct hash_netport6_telem {
 261         union nf_inet_addr ip;
 262         __be16 port;
 263         u8 proto;
 264         u8 cidr;
 265         unsigned long timeout;
 266 };
 267
 268 static inline bool
 269 hash_netport6_data_equal(const struct hash_netport6_elem *ip1,
 270                          const struct hash_netport6_elem *ip2)
 271 {
 272         return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
 273                ip1->port == ip2->port &&
 274                ip1->proto == ip2->proto &&
 275                ip1->cidr == ip2->cidr;
 276 }
 277
 278 static inline bool
 279 hash_netport6_data_isnull(const struct hash_netport6_elem *elem)
 280 {
 281         return elem->proto == 0;
 282 }
 283
 284 static inline void
 285 hash_netport6_data_copy(struct hash_netport6_elem *dst,
 286                         const struct hash_netport6_elem *src)
 287 {
 288         memcpy(dst, src, sizeof(*dst));
 289 }
 290
 291 static inline void
 292 hash_netport6_data_zero_out(struct hash_netport6_elem *elem)
 293 {
 294         elem->proto = 0;
 295 }
 296
 297 static inline void
 298 ip6_netmask(union nf_inet_addr *ip, u8 prefix)
 299 {
 300         ip->ip6[0] &= ip_set_netmask6(prefix)[0];
 301         ip->ip6[1] &= ip_set_netmask6(prefix)[1];
 302         ip->ip6[2] &= ip_set_netmask6(prefix)[2];
 303         ip->ip6[3] &= ip_set_netmask6(prefix)[3];
 304 }
 305
 306 static inline void
 307 hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr)
 308 {
 309         ip6_netmask(&elem->ip, cidr);
 310         elem->cidr = cidr;
 311 }
 312
 313 static bool
 314 hash_netport6_data_list(struct sk_buff *skb,
 315                         const struct hash_netport6_elem *data)
 316 {
 317         NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &data->ip);
 318         NLA_PUT_NET16(skb, IPSET_ATTR_PORT, data->port);
 319         NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
 320         NLA_PUT_U8(skb, IPSET_ATTR_PROTO, data->proto);
 321         return 0;
 322
 323 nla_put_failure:
 324         return 1;
 325 }
 326
 327 static bool
 328 hash_netport6_data_tlist(struct sk_buff *skb,
 329                          const struct hash_netport6_elem *data)
 330 {
 331         const struct hash_netport6_telem *e =
 332                 (const struct hash_netport6_telem *)data;
 333
 334         NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &e->ip);
 335         NLA_PUT_NET16(skb, IPSET_ATTR_PORT, data->port);
 336         NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
 337         NLA_PUT_U8(skb, IPSET_ATTR_PROTO, data->proto);
 338         NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,
 339                       htonl(ip_set_timeout_get(e->timeout)));
 340         return 0;
 341
 342 nla_put_failure:
 343         return 1;
 344 }
 345
 346 #undef PF
 347 #undef HOST_MASK
 348
 349 #define PF              6
 350 #define HOST_MASK       128
 351 #include <linux/netfilter/ipset/ip_set_ahash.h>
 352
 353 static int
 354 hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 355                    enum ipset_adt adt, u8 pf, u8 dim, u8 flags)
 356 {
 357         const struct ip_set_hash *h = set->data;
 358         ipset_adtfn adtfn = set->variant->adt[adt];
 359         struct hash_netport6_elem data = {
 360                 .cidr = h->nets[0].cidr || HOST_MASK };
 361
 362         if (data.cidr == 0)
 363                 return -EINVAL;
 364         if (adt == IPSET_TEST)
 365                 data.cidr = HOST_MASK;
 366
 367         if (!ip_set_get_ip6_port(skb, flags & IPSET_DIM_TWO_SRC,
 368                                  &data.port, &data.proto))
 369                 return -EINVAL;
 370
 371         ip6addrptr(skb, flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
 372         ip6_netmask(&data.ip, data.cidr);
 373
 374         return adtfn(set, &data, h->timeout);
 375 }
 376
 377 static int
 378 hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[],
 379                    enum ipset_adt adt, u32 *lineno, u32 flags)
 380 {
 381         const struct ip_set_hash *h = set->data;
 382         ipset_adtfn adtfn = set->variant->adt[adt];
 383         struct hash_netport6_elem data = { .cidr = HOST_MASK };
 384         u32 port, port_to;
 385         u32 timeout = h->timeout;
 386         bool with_ports = false;
 387         int ret;
 388
 389         if (unlikely(!tb[IPSET_ATTR_IP] ||
 390                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 391                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 392                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 393                 return -IPSET_ERR_PROTOCOL;
 394
 395         if (tb[IPSET_ATTR_LINENO])
 396                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 397
 398         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &data.ip);
 399         if (ret)
 400                 return ret;
 401
 402         if (tb[IPSET_ATTR_CIDR])
 403                 data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 404         if (!data.cidr)
 405                 return -IPSET_ERR_INVALID_CIDR;
 406         ip6_netmask(&data.ip, data.cidr);
 407
 408         if (tb[IPSET_ATTR_PORT])
 409                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 410         else
 411                 return -IPSET_ERR_PROTOCOL;
 412
 413         if (tb[IPSET_ATTR_PROTO]) {
 414                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 415                 with_ports = ip_set_proto_with_ports(data.proto);
 416
 417                 if (data.proto == 0)
 418                         return -IPSET_ERR_INVALID_PROTO;
 419         } else
 420                 return -IPSET_ERR_MISSING_PROTO;
 421
 422         if (!(with_ports || data.proto == IPPROTO_ICMPV6))
 423                 data.port = 0;
 424
 425         if (tb[IPSET_ATTR_TIMEOUT]) {
 426                 if (!with_timeout(h->timeout))
 427                         return -IPSET_ERR_TIMEOUT;
 428                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 429         }
 430
 431         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 432                 ret = adtfn(set, &data, timeout);
 433                 return ip_set_eexist(ret, flags) ? 0 : ret;
 434         }
 435
 436         port = ntohs(data.port);
 437         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 438         if (port > port_to)
 439                 swap(port, port_to);
 440
 441         for (; port <= port_to; port++) {
 442                 data.port = htons(port);
 443                 ret = adtfn(set, &data, timeout);
 444
 445                 if (ret && !ip_set_eexist(ret, flags))
 446                         return ret;
 447                 else
 448                         ret = 0;
 449         }
 450         return ret;
 451 }
 452
 453 /* Create hash:ip type of sets */
 454
 455 static int
 456 hash_netport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 457 {
 458         struct ip_set_hash *h;
 459         u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 460         u8 hbits;
 461
 462         if (!(set->family == AF_INET || set->family == AF_INET6))
 463                 return -IPSET_ERR_INVALID_FAMILY;
 464
 465         if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
 466                      !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
 467                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 468                 return -IPSET_ERR_PROTOCOL;
 469
 470         if (tb[IPSET_ATTR_HASHSIZE]) {
 471                 hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
 472                 if (hashsize < IPSET_MIMINAL_HASHSIZE)
 473                         hashsize = IPSET_MIMINAL_HASHSIZE;
 474         }
 475
 476         if (tb[IPSET_ATTR_MAXELEM])
 477                 maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
 478
 479         h = kzalloc(sizeof(*h)
 480                     + sizeof(struct ip_set_hash_nets)
 481                       * (set->family == AF_INET ? 32 : 128), GFP_KERNEL);
 482         if (!h)
 483                 return -ENOMEM;
 484
 485         h->maxelem = maxelem;
 486         get_random_bytes(&h->initval, sizeof(h->initval));
 487         h->timeout = IPSET_NO_TIMEOUT;
 488
 489         hbits = htable_bits(hashsize);
 490         h->table = ip_set_alloc(
 491                         sizeof(struct htable)
 492                         + jhash_size(hbits) * sizeof(struct hbucket));
 493         if (!h->table) {
 494                 kfree(h);
 495                 return -ENOMEM;
 496         }
 497         h->table->htable_bits = hbits;
 498
 499         set->data = h;
 500
 501         if (tb[IPSET_ATTR_TIMEOUT]) {
 502                 h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 503
 504                 set->variant = set->family == AF_INET
 505                         ? &hash_netport4_tvariant : &hash_netport6_tvariant;
 506
 507                 if (set->family == AF_INET)
 508                         hash_netport4_gc_init(set);
 509                 else
 510                         hash_netport6_gc_init(set);
 511         } else {
 512                 set->variant = set->family == AF_INET
 513                         ? &hash_netport4_variant : &hash_netport6_variant;
 514         }
 515
 516         pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
 517                  set->name, jhash_size(h->table->htable_bits),
 518                  h->table->htable_bits, h->maxelem, set->data, h->table);
 519
 520         return 0;
 521 }
 522
 523 static struct ip_set_type hash_netport_type __read_mostly = {
 524         .name           = "hash:net,port",
 525         .protocol       = IPSET_PROTOCOL,
 526         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT,
 527         .dimension      = IPSET_DIM_TWO,
 528         .family         = AF_UNSPEC,
 529         .revision       = 1,
 530         .create         = hash_netport_create,
 531         .create_policy  = {
 532                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 533                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 534                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 535                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 536                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 537                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 538         },
 539         .adt_policy     = {
 540                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 541                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 542                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 543                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 544                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 545                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 546                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 547         },
 548         .me             = THIS_MODULE,
 549 };
 550
 551 static int __init
 552 hash_netport_init(void)
 553 {
 554         return ip_set_type_register(&hash_netport_type);
 555 }
 556
 557 static void __exit
 558 hash_netport_fini(void)
 559 {
 560         ip_set_type_unregister(&hash_netport_type);
 561 }
 562
 563 module_init(hash_netport_init);
 564 module_exit(hash_netport_fini);