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, 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_to = 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         }
 227
 228         port_to = port = ntohs(data.port);
 229         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 230                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 231                 if (port > port_to)
 232                         swap(port, port_to);
 233         }
 234
 235         if (retried)
 236                 ip = ntohl(h->next.ip);
 237         for (; !before(ip_to, ip); ip++) {
 238                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 239                                                        : port;
 240                 for (; p <= port_to; p++) {
 241                         data.ip = htonl(ip);
 242                         data.port = htons(p);
 243                         ret = adtfn(set, &data, timeout, flags);
 244
 245                         if (ret && !ip_set_eexist(ret, flags))
 246                                 return ret;
 247                         else
 248                                 ret = 0;
 249                 }
 250         }
 251         return ret;
 252 }
 253
 254 static bool
 255 hash_ipport_same_set(const struct ip_set *a, const struct ip_set *b)
 256 {
 257         const struct ip_set_hash *x = a->data;
 258         const struct ip_set_hash *y = b->data;
 259
 260         /* Resizing changes htable_bits, so we ignore it */
 261         return x->maxelem == y->maxelem &&
 262                x->timeout == y->timeout;
 263 }
 264
 265 /* The type variant functions: IPv6 */
 266
 267 struct hash_ipport6_elem {
 268         union nf_inet_addr ip;
 269         __be16 port;
 270         u8 proto;
 271         u8 padding;
 272 };
 273
 274 struct hash_ipport6_telem {
 275         union nf_inet_addr ip;
 276         __be16 port;
 277         u8 proto;
 278         u8 padding;
 279         unsigned long timeout;
 280 };
 281
 282 static inline bool
 283 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
 284                         const struct hash_ipport6_elem *ip2,
 285                         u32 *multi)
 286 {
 287         return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
 288                ip1->port == ip2->port &&
 289                ip1->proto == ip2->proto;
 290 }
 291
 292 static inline bool
 293 hash_ipport6_data_isnull(const struct hash_ipport6_elem *elem)
 294 {
 295         return elem->proto == 0;
 296 }
 297
 298 static inline void
 299 hash_ipport6_data_copy(struct hash_ipport6_elem *dst,
 300                        const struct hash_ipport6_elem *src)
 301 {
 302         memcpy(dst, src, sizeof(*dst));
 303 }
 304
 305 static inline void
 306 hash_ipport6_data_zero_out(struct hash_ipport6_elem *elem)
 307 {
 308         elem->proto = 0;
 309 }
 310
 311 static bool
 312 hash_ipport6_data_list(struct sk_buff *skb,
 313                        const struct hash_ipport6_elem *data)
 314 {
 315         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 316             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 317             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 318                 goto nla_put_failure;
 319         return 0;
 320
 321 nla_put_failure:
 322         return 1;
 323 }
 324
 325 static bool
 326 hash_ipport6_data_tlist(struct sk_buff *skb,
 327                         const struct hash_ipport6_elem *data)
 328 {
 329         const struct hash_ipport6_telem *e =
 330                 (const struct hash_ipport6_telem *)data;
 331
 332         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
 333             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 334             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 335             nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
 336                           htonl(ip_set_timeout_get(e->timeout))))
 337                 goto nla_put_failure;
 338         return 0;
 339
 340 nla_put_failure:
 341         return 1;
 342 }
 343
 344 #undef PF
 345 #undef HOST_MASK
 346
 347 #define PF              6
 348 #define HOST_MASK       128
 349 #include <linux/netfilter/ipset/ip_set_ahash.h>
 350
 351 static inline void
 352 hash_ipport6_data_next(struct ip_set_hash *h,
 353                        const struct hash_ipport6_elem *d)
 354 {
 355         h->next.port = d->port;
 356 }
 357
 358 static int
 359 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 360                   const struct xt_action_param *par,
 361                   enum ipset_adt adt, const struct ip_set_adt_opt *opt)
 362 {
 363         const struct ip_set_hash *h = set->data;
 364         ipset_adtfn adtfn = set->variant->adt[adt];
 365         struct hash_ipport6_elem data = { };
 366
 367         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 368                                  &data.port, &data.proto))
 369                 return -EINVAL;
 370
 371         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
 372
 373         return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
 374 }
 375
 376 static int
 377 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
 378                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 379 {
 380         const struct ip_set_hash *h = set->data;
 381         ipset_adtfn adtfn = set->variant->adt[adt];
 382         struct hash_ipport6_elem data = { };
 383         u32 port, port_to;
 384         u32 timeout = h->timeout;
 385         bool with_ports = false;
 386         int ret;
 387
 388         if (unlikely(!tb[IPSET_ATTR_IP] ||
 389                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 390                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 391                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 392                      tb[IPSET_ATTR_IP_TO] ||
 393                      tb[IPSET_ATTR_CIDR]))
 394                 return -IPSET_ERR_PROTOCOL;
 395
 396         if (tb[IPSET_ATTR_LINENO])
 397                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 398
 399         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &data.ip);
 400         if (ret)
 401                 return ret;
 402
 403         if (tb[IPSET_ATTR_PORT])
 404                 data.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 405         else
 406                 return -IPSET_ERR_PROTOCOL;
 407
 408         if (tb[IPSET_ATTR_PROTO]) {
 409                 data.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 410                 with_ports = ip_set_proto_with_ports(data.proto);
 411
 412                 if (data.proto == 0)
 413                         return -IPSET_ERR_INVALID_PROTO;
 414         } else
 415                 return -IPSET_ERR_MISSING_PROTO;
 416
 417         if (!(with_ports || data.proto == IPPROTO_ICMPV6))
 418                 data.port = 0;
 419
 420         if (tb[IPSET_ATTR_TIMEOUT]) {
 421                 if (!with_timeout(h->timeout))
 422                         return -IPSET_ERR_TIMEOUT;
 423                 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 424         }
 425
 426         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 427                 ret = adtfn(set, &data, timeout, flags);
 428                 return ip_set_eexist(ret, flags) ? 0 : ret;
 429         }
 430
 431         port = ntohs(data.port);
 432         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 433         if (port > port_to)
 434                 swap(port, port_to);
 435
 436         if (retried)
 437                 port = ntohs(h->next.port);
 438         for (; port <= port_to; port++) {
 439                 data.port = htons(port);
 440                 ret = adtfn(set, &data, timeout, flags);
 441
 442                 if (ret && !ip_set_eexist(ret, flags))
 443                         return ret;
 444                 else
 445                         ret = 0;
 446         }
 447         return ret;
 448 }
 449
 450 /* Create hash:ip type of sets */
 451
 452 static int
 453 hash_ipport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 454 {
 455         struct ip_set_hash *h;
 456         u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 457         u8 hbits;
 458         size_t hsize;
 459
 460         if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 461                 return -IPSET_ERR_INVALID_FAMILY;
 462
 463         if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
 464                      !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
 465                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
 466                 return -IPSET_ERR_PROTOCOL;
 467
 468         if (tb[IPSET_ATTR_HASHSIZE]) {
 469                 hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
 470                 if (hashsize < IPSET_MIMINAL_HASHSIZE)
 471                         hashsize = IPSET_MIMINAL_HASHSIZE;
 472         }
 473
 474         if (tb[IPSET_ATTR_MAXELEM])
 475                 maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
 476
 477         h = kzalloc(sizeof(*h), GFP_KERNEL);
 478         if (!h)
 479                 return -ENOMEM;
 480
 481         h->maxelem = maxelem;
 482         get_random_bytes(&h->initval, sizeof(h->initval));
 483         h->timeout = IPSET_NO_TIMEOUT;
 484
 485         hbits = htable_bits(hashsize);
 486         hsize = htable_size(hbits);
 487         if (hsize == 0) {
 488                 kfree(h);
 489                 return -ENOMEM;
 490         }
 491         h->table = ip_set_alloc(hsize);
 492         if (!h->table) {
 493                 kfree(h);
 494                 return -ENOMEM;
 495         }
 496         h->table->htable_bits = hbits;
 497
 498         set->data = h;
 499
 500         if (tb[IPSET_ATTR_TIMEOUT]) {
 501                 h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 502
 503                 set->variant = set->family == NFPROTO_IPV4
 504                         ? &hash_ipport4_tvariant : &hash_ipport6_tvariant;
 505
 506                 if (set->family == NFPROTO_IPV4)
 507                         hash_ipport4_gc_init(set);
 508                 else
 509                         hash_ipport6_gc_init(set);
 510         } else {
 511                 set->variant = set->family == NFPROTO_IPV4
 512                         ? &hash_ipport4_variant : &hash_ipport6_variant;
 513         }
 514
 515         pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
 516                  set->name, jhash_size(h->table->htable_bits),
 517                  h->table->htable_bits, h->maxelem, set->data, h->table);
 518
 519         return 0;
 520 }
 521
 522 static struct ip_set_type hash_ipport_type __read_mostly = {
 523         .name           = "hash:ip,port",
 524         .protocol       = IPSET_PROTOCOL,
 525         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT,
 526         .dimension      = IPSET_DIM_TWO,
 527         .family         = NFPROTO_UNSPEC,
 528         .revision_min   = REVISION_MIN,
 529         .revision_max   = REVISION_MAX,
 530         .create         = hash_ipport_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_IP_TO]      = { .type = NLA_NESTED },
 542                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 543                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 544                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 545                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 546                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 547                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 548         },
 549         .me             = THIS_MODULE,
 550 };
 551
 552 static int __init
 553 hash_ipport_init(void)
 554 {
 555         return ip_set_type_register(&hash_ipport_type);
 556 }
 557
 558 static void __exit
 559 hash_ipport_fini(void)
 560 {
 561         ip_set_type_unregister(&hash_ipport_type);
 562 }
 563
 564 module_init(hash_ipport_init);
 565 module_exit(hash_ipport_fini);