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 #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", REVISION_MIN, REVISION_MAX);
  34 MODULE_ALIAS("ip_set_hash:ip,port");
  35
  36 /* Type specific function prefix */
  37 #define TYPE            hash_ipport
  38
  39 static bool
  40 hash_ipport_same_set(const struct ip_set *a, const struct ip_set *b);
  41
  42 #define hash_ipport4_same_set   hash_ipport_same_set
  43 #define hash_ipport6_same_set   hash_ipport_same_set
  44
  45 /* The type variant functions: IPv4 */
  46
  47 /* Member elements without timeout */
  48 struct hash_ipport4_elem {
  49         __be32 ip;
  50         __be16 port;
  51         u8 proto;
  52         u8 padding;
  53 };
  54
  55 /* Member elements with timeout support */
  56 struct hash_ipport4_telem {
  57         __be32 ip;
  58         __be16 port;
  59         u8 proto;
  60         u8 padding;
  61         unsigned long timeout;
  62 };
  63
  64 static inline bool
  65 hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1,
  66                         const struct hash_ipport4_elem *ip2,
  67                         u32 *multi)
  68 {
  69         return ip1->ip == ip2->ip &&
  70                ip1->port == ip2->port &&
  71                ip1->proto == ip2->proto;
  72 }
  73
  74 static inline bool
  75 hash_ipport4_data_isnull(const struct hash_ipport4_elem *elem)
  76 {
  77         return elem->proto == 0;
  78 }
  79
  80 static inline void
  81 hash_ipport4_data_copy(struct hash_ipport4_elem *dst,
  82                        const struct hash_ipport4_elem *src)
  83 {
  84         dst->ip = src->ip;
  85         dst->port = src->port;
  86         dst->proto = src->proto;
  87 }
  88
  89 static inline void
  90 hash_ipport4_data_zero_out(struct hash_ipport4_elem *elem)
  91 {
  92         elem->proto = 0;
  93 }
  94
  95 static bool
  96 hash_ipport4_data_list(struct sk_buff *skb,
  97                        const struct hash_ipport4_elem *data)
  98 {
  99         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 100             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 101             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 102                 goto nla_put_failure;
 103         return 0;
 104
 105 nla_put_failure:
 106         return 1;
 107 }
 108
 109 static bool
 110 hash_ipport4_data_tlist(struct sk_buff *skb,
 111                         const struct hash_ipport4_elem *data)
 112 {
 113         const struct hash_ipport4_telem *tdata =
 114                 (const struct hash_ipport4_telem *)data;
 115
 116         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, tdata->ip) ||
 117             nla_put_net16(skb, IPSET_ATTR_PORT, tdata->port) ||
 118             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 119             nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
 120                           htonl(ip_set_timeout_get(tdata->timeout))))
 121                 goto nla_put_failure;
 122         return 0;
 123
 124 nla_put_failure:
 125         return 1;
 126 }
 127
 128 #define PF              4
 129 #define HOST_MASK       32
 130 #include <linux/netfilter/ipset/ip_set_ahash.h>
 131
 132 static inline void
 133 hash_ipport4_data_next(struct ip_set_hash *h,
 134                        const struct hash_ipport4_elem *d)
 135 {
 136         h->next.ip = d->ip;
 137         h->next.port = d->port;
 138 }
 139
 140 static int
 141 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 142                   const struct xt_action_param *par,
 143                   enum ipset_adt adt, const struct ip_set_adt_opt *opt)
 144 {
 145         const struct ip_set_hash *h = set->data;
 146         ipset_adtfn adtfn = set->variant->adt[adt];
 147         struct hash_ipport4_elem data = { };
 148
 149         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 150                                  &data.port, &data.proto))
 151                 return -EINVAL;
 152
 153         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip);
 154
 155         return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
 156 }
 157
 158 static int
 159 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
 160                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 161 {
 162         const struct ip_set_hash *h = set->data;
 163         ipset_adtfn adtfn = set->variant->adt[adt];
 164         struct hash_ipport4_elem data = { };
 165         u32 ip, ip_to = 0, p = 0, port, port_to;
 166         u32 timeout = h->timeout;
 167         bool with_ports = false;
 168         int ret;
 169
 170         if (unlikely(!tb[IPSET_ATTR_IP] ||
 171                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 172                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 173                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 174                 return -IPSET_ERR_PROTOCOL;
 175
 176         if (tb[IPSET_ATTR_LINENO])
 177                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 178
 179         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &data.ip);
 180         if (ret)
 181                 return ret;
 182
 183         if (tb[IPSET_ATTR_PORT])
 184                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 185         else
 186                 return -IPSET_ERR_PROTOCOL;
 187
 188         if (tb[IPSET_ATTR_PROTO]) {
 189                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 190                 with_ports = ip_set_proto_with_ports(data.proto);
 191
 192                 if (data.proto == 0)
 193                         return -IPSET_ERR_INVALID_PROTO;
 194         } else
 195                 return -IPSET_ERR_MISSING_PROTO;
 196
 197         if (!(with_ports || data.proto == IPPROTO_ICMP))
 198                 data.port = 0;
 199
 200         if (tb[IPSET_ATTR_TIMEOUT]) {
 201                 if (!with_timeout(h->timeout))
 202                         return -IPSET_ERR_TIMEOUT;
 203                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 204         }
 205
 206         if (adt == IPSET_TEST ||
 207             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
 208               tb[IPSET_ATTR_PORT_TO])) {
 209                 ret = adtfn(set, &data, timeout, flags);
 210                 return ip_set_eexist(ret, flags) ? 0 : ret;
 211         }
 212
 213         ip = ntohl(data.ip);
 214         if (tb[IPSET_ATTR_IP_TO]) {
 215                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 216                 if (ret)
 217                         return ret;
 218                 if (ip > ip_to)
 219                         swap(ip, ip_to);
 220         } else if (tb[IPSET_ATTR_CIDR]) {
 221                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 222
 223                 if (!cidr || cidr > 32)
 224                         return -IPSET_ERR_INVALID_CIDR;
 225                 ip_set_mask_from_to(ip, ip_to, cidr);
 226         } else
 227                 ip_to = ip;
 228
 229         port_to = port = ntohs(data.port);
 230         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 231                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 232                 if (port > port_to)
 233                         swap(port, port_to);
 234         }
 235
 236         if (retried)
 237                 ip = ntohl(h->next.ip);
 238         for (; !before(ip_to, ip); ip++) {
 239                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 240                                                        : port;
 241                 for (; p <= port_to; p++) {
 242                         data.ip = htonl(ip);
 243                         data.port = htons(p);
 244                         ret = adtfn(set, &data, timeout, flags);
 245
 246                         if (ret && !ip_set_eexist(ret, flags))
 247                                 return ret;
 248                         else
 249                                 ret = 0;
 250                 }
 251         }
 252         return ret;
 253 }
 254
 255 static bool
 256 hash_ipport_same_set(const struct ip_set *a, const struct ip_set *b)
 257 {
 258         const struct ip_set_hash *x = a->data;
 259         const struct ip_set_hash *y = b->data;
 260
 261         /* Resizing changes htable_bits, so we ignore it */
 262         return x->maxelem == y->maxelem &&
 263                x->timeout == y->timeout;
 264 }
 265
 266 /* The type variant functions: IPv6 */
 267
 268 struct hash_ipport6_elem {
 269         union nf_inet_addr ip;
 270         __be16 port;
 271         u8 proto;
 272         u8 padding;
 273 };
 274
 275 struct hash_ipport6_telem {
 276         union nf_inet_addr ip;
 277         __be16 port;
 278         u8 proto;
 279         u8 padding;
 280         unsigned long timeout;
 281 };
 282
 283 static inline bool
 284 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
 285                         const struct hash_ipport6_elem *ip2,
 286                         u32 *multi)
 287 {
 288         return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
 289                ip1->port == ip2->port &&
 290                ip1->proto == ip2->proto;
 291 }
 292
 293 static inline bool
 294 hash_ipport6_data_isnull(const struct hash_ipport6_elem *elem)
 295 {
 296         return elem->proto == 0;
 297 }
 298
 299 static inline void
 300 hash_ipport6_data_copy(struct hash_ipport6_elem *dst,
 301                        const struct hash_ipport6_elem *src)
 302 {
 303         memcpy(dst, src, sizeof(*dst));
 304 }
 305
 306 static inline void
 307 hash_ipport6_data_zero_out(struct hash_ipport6_elem *elem)
 308 {
 309         elem->proto = 0;
 310 }
 311
 312 static bool
 313 hash_ipport6_data_list(struct sk_buff *skb,
 314                        const struct hash_ipport6_elem *data)
 315 {
 316         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 317             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 318             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 319                 goto nla_put_failure;
 320         return 0;
 321
 322 nla_put_failure:
 323         return 1;
 324 }
 325
 326 static bool
 327 hash_ipport6_data_tlist(struct sk_buff *skb,
 328                         const struct hash_ipport6_elem *data)
 329 {
 330         const struct hash_ipport6_telem *e =
 331                 (const struct hash_ipport6_telem *)data;
 332
 333         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
 334             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 335             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 336             nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
 337                           htonl(ip_set_timeout_get(e->timeout))))
 338                 goto nla_put_failure;
 339         return 0;
 340
 341 nla_put_failure:
 342         return 1;
 343 }
 344
 345 #undef PF
 346 #undef HOST_MASK
 347
 348 #define PF              6
 349 #define HOST_MASK       128
 350 #include <linux/netfilter/ipset/ip_set_ahash.h>
 351
 352 static inline void
 353 hash_ipport6_data_next(struct ip_set_hash *h,
 354                        const struct hash_ipport6_elem *d)
 355 {
 356         h->next.port = d->port;
 357 }
 358
 359 static int
 360 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 361                   const struct xt_action_param *par,
 362                   enum ipset_adt adt, const struct ip_set_adt_opt *opt)
 363 {
 364         const struct ip_set_hash *h = set->data;
 365         ipset_adtfn adtfn = set->variant->adt[adt];
 366         struct hash_ipport6_elem data = { };
 367
 368         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 369                                  &data.port, &data.proto))
 370                 return -EINVAL;
 371
 372         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
 373
 374         return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
 375 }
 376
 377 static int
 378 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
 379                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 380 {
 381         const struct ip_set_hash *h = set->data;
 382         ipset_adtfn adtfn = set->variant->adt[adt];
 383         struct hash_ipport6_elem data = { };
 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                      tb[IPSET_ATTR_IP_TO] ||
 394                      tb[IPSET_ATTR_CIDR]))
 395                 return -IPSET_ERR_PROTOCOL;
 396
 397         if (tb[IPSET_ATTR_LINENO])
 398                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 399
 400         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &data.ip);
 401         if (ret)
 402                 return ret;
 403
 404         if (tb[IPSET_ATTR_PORT])
 405                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 406         else
 407                 return -IPSET_ERR_PROTOCOL;
 408
 409         if (tb[IPSET_ATTR_PROTO]) {
 410                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 411                 with_ports = ip_set_proto_with_ports(data.proto);
 412
 413                 if (data.proto == 0)
 414                         return -IPSET_ERR_INVALID_PROTO;
 415         } else
 416                 return -IPSET_ERR_MISSING_PROTO;
 417
 418         if (!(with_ports || data.proto == IPPROTO_ICMPV6))
 419                 data.port = 0;
 420
 421         if (tb[IPSET_ATTR_TIMEOUT]) {
 422                 if (!with_timeout(h->timeout))
 423                         return -IPSET_ERR_TIMEOUT;
 424                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 425         }
 426
 427         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 428                 ret = adtfn(set, &data, timeout, flags);
 429                 return ip_set_eexist(ret, flags) ? 0 : ret;
 430         }
 431
 432         port = ntohs(data.port);
 433         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 434         if (port > port_to)
 435                 swap(port, port_to);
 436
 437         if (retried)
 438                 port = ntohs(h->next.port);
 439         for (; port <= port_to; port++) {
 440                 data.port = htons(port);
 441                 ret = adtfn(set, &data, timeout, flags);
 442
 443                 if (ret && !ip_set_eexist(ret, flags))
 444                         return ret;
 445                 else
 446                         ret = 0;
 447         }
 448         return ret;
 449 }
 450
 451 /* Create hash:ip type of sets */
 452
 453 static int
 454 hash_ipport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 455 {
 456         struct ip_set_hash *h;
 457         u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 458         u8 hbits;
 459         size_t hsize;
 460
 461         if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 462                 return -IPSET_ERR_INVALID_FAMILY;
 463
 464         if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
 465                      !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
 466                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 467                 return -IPSET_ERR_PROTOCOL;
 468
 469         if (tb[IPSET_ATTR_HASHSIZE]) {
 470                 hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
 471                 if (hashsize < IPSET_MIMINAL_HASHSIZE)
 472                         hashsize = IPSET_MIMINAL_HASHSIZE;
 473         }
 474
 475         if (tb[IPSET_ATTR_MAXELEM])
 476                 maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
 477
 478         h = kzalloc(sizeof(*h), GFP_KERNEL);
 479         if (!h)
 480                 return -ENOMEM;
 481
 482         h->maxelem = maxelem;
 483         get_random_bytes(&h->initval, sizeof(h->initval));
 484         h->timeout = IPSET_NO_TIMEOUT;
 485
 486         hbits = htable_bits(hashsize);
 487         hsize = htable_size(hbits);
 488         if (hsize == 0) {
 489                 kfree(h);
 490                 return -ENOMEM;
 491         }
 492         h->table = ip_set_alloc(hsize);
 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 == NFPROTO_IPV4
 505                         ? &hash_ipport4_tvariant : &hash_ipport6_tvariant;
 506
 507                 if (set->family == NFPROTO_IPV4)
 508                         hash_ipport4_gc_init(set);
 509                 else
 510                         hash_ipport6_gc_init(set);
 511         } else {
 512                 set->variant = set->family == NFPROTO_IPV4
 513                         ? &hash_ipport4_variant : &hash_ipport6_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_ipport_type __read_mostly = {
 524         .name           = "hash:ip,port",
 525         .protocol       = IPSET_PROTOCOL,
 526         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT,
 527         .dimension      = IPSET_DIM_TWO,
 528         .family         = NFPROTO_UNSPEC,
 529         .revision_min   = REVISION_MIN,
 530         .revision_max   = REVISION_MAX,
 531         .create         = hash_ipport_create,
 532         .create_policy  = {
 533                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 534                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 535                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 536                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 537                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 538                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 539         },
 540         .adt_policy     = {
 541                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 542                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 543                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 544                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 545                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 546                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 547                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 548                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 549         },
 550         .me             = THIS_MODULE,
 551 };
 552
 553 static int __init
 554 hash_ipport_init(void)
 555 {
 556         return ip_set_type_register(&hash_ipport_type);
 557 }
 558
 559 static void __exit
 560 hash_ipport_fini(void)
 561 {
 562         ip_set_type_unregister(&hash_ipport_type);
 563 }
 564
 565 module_init(hash_ipport_init);
 566 module_exit(hash_ipport_fini);