net/netfilter/ipset/ip_set_hash_ipport.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 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 MODULE_LICENSE("GPL");
  29 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  30 MODULE_DESCRIPTION("hash:ip,port type of IP sets");
  31 MODULE_ALIAS("ip_set_hash:ip,port");
  32
  33 /* Type specific function prefix */
  34 #define TYPE            hash_ipport
  35
  36 static bool
  37 hash_ipport_same_set(const struct ip_set *a, const struct ip_set *b);
  38
  39 #define hash_ipport4_same_set   hash_ipport_same_set
  40 #define hash_ipport6_same_set   hash_ipport_same_set
  41
  42 /* The type variant functions: IPv4 */
  43
  44 /* Member elements without timeout */
  45 struct hash_ipport4_elem {
  46         __be32 ip;
  47         __be16 port;
  48         u8 proto;
  49         u8 padding;
  50 };
  51
  52 /* Member elements with timeout support */
  53 struct hash_ipport4_telem {
  54         __be32 ip;
  55         __be16 port;
  56         u8 proto;
  57         u8 padding;
  58         unsigned long timeout;
  59 };
  60
  61 static inline bool
  62 hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1,
  63                         const struct hash_ipport4_elem *ip2,
  64                         u32 *multi)
  65 {
  66         return ip1->ip == ip2->ip &&
  67                ip1->port == ip2->port &&
  68                ip1->proto == ip2->proto;
  69 }
  70
  71 static inline bool
  72 hash_ipport4_data_isnull(const struct hash_ipport4_elem *elem)
  73 {
  74         return elem->proto == 0;
  75 }
  76
  77 static inline void
  78 hash_ipport4_data_copy(struct hash_ipport4_elem *dst,
  79                        const struct hash_ipport4_elem *src)
  80 {
  81         dst->ip = src->ip;
  82         dst->port = src->port;
  83         dst->proto = src->proto;
  84 }
  85
  86 static inline void
  87 hash_ipport4_data_zero_out(struct hash_ipport4_elem *elem)
  88 {
  89         elem->proto = 0;
  90 }
  91
  92 static bool
  93 hash_ipport4_data_list(struct sk_buff *skb,
  94                        const struct hash_ipport4_elem *data)
  95 {
  96         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  97             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
  98             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
  99                 goto nla_put_failure;
 100         return 0;
 101
 102 nla_put_failure:
 103         return 1;
 104 }
 105
 106 static bool
 107 hash_ipport4_data_tlist(struct sk_buff *skb,
 108                         const struct hash_ipport4_elem *data)
 109 {
 110         const struct hash_ipport4_telem *tdata =
 111                 (const struct hash_ipport4_telem *)data;
 112
 113         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, tdata->ip) ||
 114             nla_put_net16(skb, IPSET_ATTR_PORT, tdata->port) ||
 115             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 116             nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
 117                           htonl(ip_set_timeout_get(tdata->timeout))))
 118                 goto nla_put_failure;
 119         return 0;
 120
 121 nla_put_failure:
 122         return 1;
 123 }
 124
 125 #define PF              4
 126 #define HOST_MASK       32
 127 #include <linux/netfilter/ipset/ip_set_ahash.h>
 128
 129 static inline void
 130 hash_ipport4_data_next(struct ip_set_hash *h,
 131                        const struct hash_ipport4_elem *d)
 132 {
 133         h->next.ip = ntohl(d->ip);
 134         h->next.port = ntohs(d->port);
 135 }
 136
 137 static int
 138 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 139                   const struct xt_action_param *par,
 140                   enum ipset_adt adt, const struct ip_set_adt_opt *opt)
 141 {
 142         const struct ip_set_hash *h = set->data;
 143         ipset_adtfn adtfn = set->variant->adt[adt];
 144         struct hash_ipport4_elem data = { };
 145
 146         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 147                                  &data.port, &data.proto))
 148                 return -EINVAL;
 149
 150         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip);
 151
 152         return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
 153 }
 154
 155 static int
 156 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
 157                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 158 {
 159         const struct ip_set_hash *h = set->data;
 160         ipset_adtfn adtfn = set->variant->adt[adt];
 161         struct hash_ipport4_elem data = { };
 162         u32 ip, ip_to = 0, p = 0, port, port_to;
 163         u32 timeout = h->timeout;
 164         bool with_ports = false;
 165         int ret;
 166
 167         if (unlikely(!tb[IPSET_ATTR_IP] ||
 168                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 169                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 170                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 171                 return -IPSET_ERR_PROTOCOL;
 172
 173         if (tb[IPSET_ATTR_LINENO])
 174                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 175
 176         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &data.ip);
 177         if (ret)
 178                 return ret;
 179
 180         if (tb[IPSET_ATTR_PORT])
 181                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 182         else
 183                 return -IPSET_ERR_PROTOCOL;
 184
 185         if (tb[IPSET_ATTR_PROTO]) {
 186                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 187                 with_ports = ip_set_proto_with_ports(data.proto);
 188
 189                 if (data.proto == 0)
 190                         return -IPSET_ERR_INVALID_PROTO;
 191         } else
 192                 return -IPSET_ERR_MISSING_PROTO;
 193
 194         if (!(with_ports || data.proto == IPPROTO_ICMP))
 195                 data.port = 0;
 196
 197         if (tb[IPSET_ATTR_TIMEOUT]) {
 198                 if (!with_timeout(h->timeout))
 199                         return -IPSET_ERR_TIMEOUT;
 200                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 201         }
 202
 203         if (adt == IPSET_TEST ||
 204             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
 205               tb[IPSET_ATTR_PORT_TO])) {
 206                 ret = adtfn(set, &data, timeout, flags);
 207                 return ip_set_eexist(ret, flags) ? 0 : ret;
 208         }
 209
 210         ip = ntohl(data.ip);
 211         if (tb[IPSET_ATTR_IP_TO]) {
 212                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 213                 if (ret)
 214                         return ret;
 215                 if (ip > ip_to)
 216                         swap(ip, ip_to);
 217         } else if (tb[IPSET_ATTR_CIDR]) {
 218                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 219
 220                 if (cidr > 32)
 221                         return -IPSET_ERR_INVALID_CIDR;
 222                 ip_set_mask_from_to(ip, ip_to, cidr);
 223         } else
 224                 ip_to = ip;
 225
 226         port_to = port = ntohs(data.port);
 227         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 228                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 229                 if (port > port_to)
 230                         swap(port, port_to);
 231         }
 232
 233         if (retried)
 234                 ip = h->next.ip;
 235         for (; !before(ip_to, ip); ip++) {
 236                 p = retried && ip == h->next.ip ? h->next.port : port;
 237                 for (; p <= port_to; p++) {
 238                         data.ip = htonl(ip);
 239                         data.port = htons(p);
 240                         ret = adtfn(set, &data, timeout, flags);
 241
 242                         if (ret && !ip_set_eexist(ret, flags))
 243                                 return ret;
 244                         else
 245                                 ret = 0;
 246                 }
 247         }
 248         return ret;
 249 }
 250
 251 static bool
 252 hash_ipport_same_set(const struct ip_set *a, const struct ip_set *b)
 253 {
 254         const struct ip_set_hash *x = a->data;
 255         const struct ip_set_hash *y = b->data;
 256
 257         /* Resizing changes htable_bits, so we ignore it */
 258         return x->maxelem == y->maxelem &&
 259                x->timeout == y->timeout;
 260 }
 261
 262 /* The type variant functions: IPv6 */
 263
 264 struct hash_ipport6_elem {
 265         union nf_inet_addr ip;
 266         __be16 port;
 267         u8 proto;
 268         u8 padding;
 269 };
 270
 271 struct hash_ipport6_telem {
 272         union nf_inet_addr ip;
 273         __be16 port;
 274         u8 proto;
 275         u8 padding;
 276         unsigned long timeout;
 277 };
 278
 279 static inline bool
 280 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
 281                         const struct hash_ipport6_elem *ip2,
 282                         u32 *multi)
 283 {
 284         return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
 285                ip1->port == ip2->port &&
 286                ip1->proto == ip2->proto;
 287 }
 288
 289 static inline bool
 290 hash_ipport6_data_isnull(const struct hash_ipport6_elem *elem)
 291 {
 292         return elem->proto == 0;
 293 }
 294
 295 static inline void
 296 hash_ipport6_data_copy(struct hash_ipport6_elem *dst,
 297                        const struct hash_ipport6_elem *src)
 298 {
 299         memcpy(dst, src, sizeof(*dst));
 300 }
 301
 302 static inline void
 303 hash_ipport6_data_zero_out(struct hash_ipport6_elem *elem)
 304 {
 305         elem->proto = 0;
 306 }
 307
 308 static bool
 309 hash_ipport6_data_list(struct sk_buff *skb,
 310                        const struct hash_ipport6_elem *data)
 311 {
 312         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 313             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 314             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 315                 goto nla_put_failure;
 316         return 0;
 317
 318 nla_put_failure:
 319         return 1;
 320 }
 321
 322 static bool
 323 hash_ipport6_data_tlist(struct sk_buff *skb,
 324                         const struct hash_ipport6_elem *data)
 325 {
 326         const struct hash_ipport6_telem *e =
 327                 (const struct hash_ipport6_telem *)data;
 328
 329         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
 330             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 331             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 332             nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
 333                           htonl(ip_set_timeout_get(e->timeout))))
 334                 goto nla_put_failure;
 335         return 0;
 336
 337 nla_put_failure:
 338         return 1;
 339 }
 340
 341 #undef PF
 342 #undef HOST_MASK
 343
 344 #define PF              6
 345 #define HOST_MASK       128
 346 #include <linux/netfilter/ipset/ip_set_ahash.h>
 347
 348 static inline void
 349 hash_ipport6_data_next(struct ip_set_hash *h,
 350                        const struct hash_ipport6_elem *d)
 351 {
 352         h->next.port = ntohs(d->port);
 353 }
 354
 355 static int
 356 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 357                   const struct xt_action_param *par,
 358                   enum ipset_adt adt, const struct ip_set_adt_opt *opt)
 359 {
 360         const struct ip_set_hash *h = set->data;
 361         ipset_adtfn adtfn = set->variant->adt[adt];
 362         struct hash_ipport6_elem data = { };
 363
 364         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 365                                  &data.port, &data.proto))
 366                 return -EINVAL;
 367
 368         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
 369
 370         return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
 371 }
 372
 373 static int
 374 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
 375                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 376 {
 377         const struct ip_set_hash *h = set->data;
 378         ipset_adtfn adtfn = set->variant->adt[adt];
 379         struct hash_ipport6_elem data = { };
 380         u32 port, port_to;
 381         u32 timeout = h->timeout;
 382         bool with_ports = false;
 383         int ret;
 384
 385         if (unlikely(!tb[IPSET_ATTR_IP] ||
 386                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 387                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 388                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 389                      tb[IPSET_ATTR_IP_TO] ||
 390                      tb[IPSET_ATTR_CIDR]))
 391                 return -IPSET_ERR_PROTOCOL;
 392
 393         if (tb[IPSET_ATTR_LINENO])
 394                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 395
 396         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &data.ip);
 397         if (ret)
 398                 return ret;
 399
 400         if (tb[IPSET_ATTR_PORT])
 401                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 402         else
 403                 return -IPSET_ERR_PROTOCOL;
 404
 405         if (tb[IPSET_ATTR_PROTO]) {
 406                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 407                 with_ports = ip_set_proto_with_ports(data.proto);
 408
 409                 if (data.proto == 0)
 410                         return -IPSET_ERR_INVALID_PROTO;
 411         } else
 412                 return -IPSET_ERR_MISSING_PROTO;
 413
 414         if (!(with_ports || data.proto == IPPROTO_ICMPV6))
 415                 data.port = 0;
 416
 417         if (tb[IPSET_ATTR_TIMEOUT]) {
 418                 if (!with_timeout(h->timeout))
 419                         return -IPSET_ERR_TIMEOUT;
 420                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 421         }
 422
 423         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 424                 ret = adtfn(set, &data, timeout, flags);
 425                 return ip_set_eexist(ret, flags) ? 0 : ret;
 426         }
 427
 428         port = ntohs(data.port);
 429         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 430         if (port > port_to)
 431                 swap(port, port_to);
 432
 433         if (retried)
 434                 port = h->next.port;
 435         for (; port <= port_to; port++) {
 436                 data.port = htons(port);
 437                 ret = adtfn(set, &data, timeout, flags);
 438
 439                 if (ret && !ip_set_eexist(ret, flags))
 440                         return ret;
 441                 else
 442                         ret = 0;
 443         }
 444         return ret;
 445 }
 446
 447 /* Create hash:ip type of sets */
 448
 449 static int
 450 hash_ipport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 451 {
 452         struct ip_set_hash *h;
 453         u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 454         u8 hbits;
 455
 456         if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 457                 return -IPSET_ERR_INVALID_FAMILY;
 458
 459         if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
 460                      !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
 461                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 462                 return -IPSET_ERR_PROTOCOL;
 463
 464         if (tb[IPSET_ATTR_HASHSIZE]) {
 465                 hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
 466                 if (hashsize < IPSET_MIMINAL_HASHSIZE)
 467                         hashsize = IPSET_MIMINAL_HASHSIZE;
 468         }
 469
 470         if (tb[IPSET_ATTR_MAXELEM])
 471                 maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
 472
 473         h = kzalloc(sizeof(*h), GFP_KERNEL);
 474         if (!h)
 475                 return -ENOMEM;
 476
 477         h->maxelem = maxelem;
 478         get_random_bytes(&h->initval, sizeof(h->initval));
 479         h->timeout = IPSET_NO_TIMEOUT;
 480
 481         hbits = htable_bits(hashsize);
 482         h->table = ip_set_alloc(
 483                         sizeof(struct htable)
 484                         + jhash_size(hbits) * sizeof(struct hbucket));
 485         if (!h->table) {
 486                 kfree(h);
 487                 return -ENOMEM;
 488         }
 489         h->table->htable_bits = hbits;
 490
 491         set->data = h;
 492
 493         if (tb[IPSET_ATTR_TIMEOUT]) {
 494                 h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 495
 496                 set->variant = set->family == NFPROTO_IPV4
 497                         ? &hash_ipport4_tvariant : &hash_ipport6_tvariant;
 498
 499                 if (set->family == NFPROTO_IPV4)
 500                         hash_ipport4_gc_init(set);
 501                 else
 502                         hash_ipport6_gc_init(set);
 503         } else {
 504                 set->variant = set->family == NFPROTO_IPV4
 505                         ? &hash_ipport4_variant : &hash_ipport6_variant;
 506         }
 507
 508         pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
 509                  set->name, jhash_size(h->table->htable_bits),
 510                  h->table->htable_bits, h->maxelem, set->data, h->table);
 511
 512         return 0;
 513 }
 514
 515 static struct ip_set_type hash_ipport_type __read_mostly = {
 516         .name           = "hash:ip,port",
 517         .protocol       = IPSET_PROTOCOL,
 518         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT,
 519         .dimension      = IPSET_DIM_TWO,
 520         .family         = NFPROTO_UNSPEC,
 521         .revision_min   = 0,
 522         .revision_max   = 1,    /* SCTP and UDPLITE support added */
 523         .create         = hash_ipport_create,
 524         .create_policy  = {
 525                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 526                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 527                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 528                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 529                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 530                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 531         },
 532         .adt_policy     = {
 533                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 534                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 535                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 536                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 537                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 538                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 539                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 540                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 541         },
 542         .me             = THIS_MODULE,
 543 };
 544
 545 static int __init
 546 hash_ipport_init(void)
 547 {
 548         return ip_set_type_register(&hash_ipport_type);
 549 }
 550
 551 static void __exit
 552 hash_ipport_fini(void)
 553 {
 554         ip_set_type_unregister(&hash_ipport_type);
 555 }
 556
 557 module_init(hash_ipport_init);
 558 module_exit(hash_ipport_fini);