net/netfilter/ipset/ip_set_hash_netport.c

   1 /* Copyright (C) 2003-2013 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_getport.h>
  24 #include <linux/netfilter/ipset/ip_set_hash.h>
  25
  26 #define REVISION_MIN    0
  27 /*                      1    SCTP and UDPLITE support added */
  28 /*                      2    Range as input support for IPv4 added */
  29 /*                      3    nomatch flag support added */
  30 #define REVISION_MAX    4 /* Counters support added */
  31
  32 MODULE_LICENSE("GPL");
  33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  34 IP_SET_MODULE_DESC("hash:net,port", REVISION_MIN, REVISION_MAX);
  35 MODULE_ALIAS("ip_set_hash:net,port");
  36
  37 /* Type specific function prefix */
  38 #define HTYPE           hash_netport
  39 #define IP_SET_HASH_WITH_PROTO
  40 #define IP_SET_HASH_WITH_NETS
  41
  42 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0
  43  * However this way we have to store internally cidr - 1,
  44  * dancing back and forth.
  45  */
  46 #define IP_SET_HASH_WITH_NETS_PACKED
  47
  48 /* IPv4 variants */
  49
  50 /* Member elements */
  51 struct hash_netport4_elem {
  52         __be32 ip;
  53         __be16 port;
  54         u8 proto;
  55         u8 cidr:7;
  56         u8 nomatch:1;
  57 };
  58
  59 struct hash_netport4t_elem {
  60         __be32 ip;
  61         __be16 port;
  62         u8 proto;
  63         u8 cidr:7;
  64         u8 nomatch:1;
  65         unsigned long timeout;
  66 };
  67
  68 struct hash_netport4c_elem {
  69         __be32 ip;
  70         __be16 port;
  71         u8 proto;
  72         u8 cidr:7;
  73         u8 nomatch:1;
  74         struct ip_set_counter counter;
  75 };
  76
  77 struct hash_netport4ct_elem {
  78         __be32 ip;
  79         __be16 port;
  80         u8 proto;
  81         u8 cidr:7;
  82         u8 nomatch:1;
  83         struct ip_set_counter counter;
  84         unsigned long timeout;
  85 };
  86
  87 /* Common functions */
  88
  89 static inline bool
  90 hash_netport4_data_equal(const struct hash_netport4_elem *ip1,
  91                          const struct hash_netport4_elem *ip2,
  92                          u32 *multi)
  93 {
  94         return ip1->ip == ip2->ip &&
  95                ip1->port == ip2->port &&
  96                ip1->proto == ip2->proto &&
  97                ip1->cidr == ip2->cidr;
  98 }
  99
 100 static inline int
 101 hash_netport4_do_data_match(const struct hash_netport4_elem *elem)
 102 {
 103         return elem->nomatch ? -ENOTEMPTY : 1;
 104 }
 105
 106 static inline void
 107 hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags)
 108 {
 109         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
 110 }
 111
 112 static inline void
 113 hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags)
 114 {
 115         swap(*flags, elem->nomatch);
 116 }
 117
 118 static inline void
 119 hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr)
 120 {
 121         elem->ip &= ip_set_netmask(cidr);
 122         elem->cidr = cidr - 1;
 123 }
 124
 125 static bool
 126 hash_netport4_data_list(struct sk_buff *skb,
 127                         const struct hash_netport4_elem *data)
 128 {
 129         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 130
 131         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 132             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 133             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
 134             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 135             (flags &&
 136              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 137                 goto nla_put_failure;
 138         return 0;
 139
 140 nla_put_failure:
 141         return 1;
 142 }
 143
 144 static inline void
 145 hash_netport4_data_next(struct hash_netport4_elem *next,
 146                         const struct hash_netport4_elem *d)
 147 {
 148         next->ip = d->ip;
 149         next->port = d->port;
 150 }
 151
 152 #define MTYPE           hash_netport4
 153 #define PF              4
 154 #define HOST_MASK       32
 155 #include "ip_set_hash_gen.h"
 156
 157 static int
 158 hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 159                    const struct xt_action_param *par,
 160                    enum ipset_adt adt, struct ip_set_adt_opt *opt)
 161 {
 162         const struct hash_netport *h = set->data;
 163         ipset_adtfn adtfn = set->variant->adt[adt];
 164         struct hash_netport4_elem e = {
 165                 .cidr = h->nets[0].cidr ? h->nets[0].cidr - 1 : HOST_MASK - 1
 166         };
 167         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
 168
 169         if (adt == IPSET_TEST)
 170                 e.cidr = HOST_MASK - 1;
 171
 172         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 173                                  &e.port, &e.proto))
 174                 return -EINVAL;
 175
 176         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 177         e.ip &= ip_set_netmask(e.cidr + 1);
 178
 179         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 180 }
 181
 182 static int
 183 hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
 184                    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 185 {
 186         const struct hash_netport *h = set->data;
 187         ipset_adtfn adtfn = set->variant->adt[adt];
 188         struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 };
 189         struct ip_set_ext ext = IP_SET_INIT_UEXT(h);
 190         u32 port, port_to, p = 0, ip = 0, ip_to, last;
 191         bool with_ports = false;
 192         u8 cidr;
 193         int ret;
 194
 195         if (unlikely(!tb[IPSET_ATTR_IP] ||
 196                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 197                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 198                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 199                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
 200                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 201                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 202                 return -IPSET_ERR_PROTOCOL;
 203
 204         if (tb[IPSET_ATTR_LINENO])
 205                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 206
 207         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
 208               ip_set_get_extensions(set, tb, &ext);
 209         if (ret)
 210                 return ret;
 211
 212         if (tb[IPSET_ATTR_CIDR]) {
 213                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 214                 if (!cidr || cidr > HOST_MASK)
 215                         return -IPSET_ERR_INVALID_CIDR;
 216                 e.cidr = cidr - 1;
 217         }
 218
 219         if (tb[IPSET_ATTR_PORT])
 220                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 221         else
 222                 return -IPSET_ERR_PROTOCOL;
 223
 224         if (tb[IPSET_ATTR_PROTO]) {
 225                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 226                 with_ports = ip_set_proto_with_ports(e.proto);
 227
 228                 if (e.proto == 0)
 229                         return -IPSET_ERR_INVALID_PROTO;
 230         } else
 231                 return -IPSET_ERR_MISSING_PROTO;
 232
 233         if (!(with_ports || e.proto == IPPROTO_ICMP))
 234                 e.port = 0;
 235
 236         with_ports = with_ports && tb[IPSET_ATTR_PORT_TO];
 237
 238         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 239                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 240                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 241                         flags |= (IPSET_FLAG_NOMATCH << 16);
 242         }
 243
 244         if (adt == IPSET_TEST || !(with_ports || tb[IPSET_ATTR_IP_TO])) {
 245                 e.ip = htonl(ip & ip_set_hostmask(e.cidr + 1));
 246                 ret = adtfn(set, &e, &ext, &ext, flags);
 247                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 248                        ip_set_eexist(ret, flags) ? 0 : ret;
 249         }
 250
 251         port = port_to = ntohs(e.port);
 252         if (tb[IPSET_ATTR_PORT_TO]) {
 253                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 254                 if (port_to < port)
 255                         swap(port, port_to);
 256         }
 257         if (tb[IPSET_ATTR_IP_TO]) {
 258                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 259                 if (ret)
 260                         return ret;
 261                 if (ip_to < ip)
 262                         swap(ip, ip_to);
 263                 if (ip + UINT_MAX == ip_to)
 264                         return -IPSET_ERR_HASH_RANGE;
 265         } else
 266                 ip_set_mask_from_to(ip, ip_to, e.cidr + 1);
 267
 268         if (retried)
 269                 ip = ntohl(h->next.ip);
 270         while (!after(ip, ip_to)) {
 271                 e.ip = htonl(ip);
 272                 last = ip_set_range_to_cidr(ip, ip_to, &cidr);
 273                 e.cidr = cidr - 1;
 274                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 275                                                        : port;
 276                 for (; p <= port_to; p++) {
 277                         e.port = htons(p);
 278                         ret = adtfn(set, &e, &ext, &ext, flags);
 279
 280                         if (ret && !ip_set_eexist(ret, flags))
 281                                 return ret;
 282                         else
 283                                 ret = 0;
 284                 }
 285                 ip = last + 1;
 286         }
 287         return ret;
 288 }
 289
 290 /* IPv6 variants */
 291
 292 struct hash_netport6_elem {
 293         union nf_inet_addr ip;
 294         __be16 port;
 295         u8 proto;
 296         u8 cidr:7;
 297         u8 nomatch:1;
 298 };
 299
 300 struct hash_netport6t_elem {
 301         union nf_inet_addr ip;
 302         __be16 port;
 303         u8 proto;
 304         u8 cidr:7;
 305         u8 nomatch:1;
 306         unsigned long timeout;
 307 };
 308
 309 struct hash_netport6c_elem {
 310         union nf_inet_addr ip;
 311         __be16 port;
 312         u8 proto;
 313         u8 cidr:7;
 314         u8 nomatch:1;
 315         struct ip_set_counter counter;
 316 };
 317
 318 struct hash_netport6ct_elem {
 319         union nf_inet_addr ip;
 320         __be16 port;
 321         u8 proto;
 322         u8 cidr:7;
 323         u8 nomatch:1;
 324         struct ip_set_counter counter;
 325         unsigned long timeout;
 326 };
 327
 328 /* Common functions */
 329
 330 static inline bool
 331 hash_netport6_data_equal(const struct hash_netport6_elem *ip1,
 332                          const struct hash_netport6_elem *ip2,
 333                          u32 *multi)
 334 {
 335         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 336                ip1->port == ip2->port &&
 337                ip1->proto == ip2->proto &&
 338                ip1->cidr == ip2->cidr;
 339 }
 340
 341 static inline int
 342 hash_netport6_do_data_match(const struct hash_netport6_elem *elem)
 343 {
 344         return elem->nomatch ? -ENOTEMPTY : 1;
 345 }
 346
 347 static inline void
 348 hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags)
 349 {
 350         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
 351 }
 352
 353 static inline void
 354 hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags)
 355 {
 356         swap(*flags, elem->nomatch);
 357 }
 358
 359 static inline void
 360 hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr)
 361 {
 362         ip6_netmask(&elem->ip, cidr);
 363         elem->cidr = cidr - 1;
 364 }
 365
 366 static bool
 367 hash_netport6_data_list(struct sk_buff *skb,
 368                         const struct hash_netport6_elem *data)
 369 {
 370         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 371
 372         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 373             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 374             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
 375             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 376             (flags &&
 377              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 378                 goto nla_put_failure;
 379         return 0;
 380
 381 nla_put_failure:
 382         return 1;
 383 }
 384
 385 static inline void
 386 hash_netport6_data_next(struct hash_netport4_elem *next,
 387                         const struct hash_netport6_elem *d)
 388 {
 389         next->port = d->port;
 390 }
 391
 392 #undef MTYPE
 393 #undef PF
 394 #undef HOST_MASK
 395
 396 #define MTYPE           hash_netport6
 397 #define PF              6
 398 #define HOST_MASK       128
 399 #define IP_SET_EMIT_CREATE
 400 #include "ip_set_hash_gen.h"
 401
 402 static int
 403 hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 404                    const struct xt_action_param *par,
 405                    enum ipset_adt adt, struct ip_set_adt_opt *opt)
 406 {
 407         const struct hash_netport *h = set->data;
 408         ipset_adtfn adtfn = set->variant->adt[adt];
 409         struct hash_netport6_elem e = {
 410                 .cidr = h->nets[0].cidr ? h->nets[0].cidr - 1 : HOST_MASK - 1,
 411         };
 412         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
 413
 414         if (adt == IPSET_TEST)
 415                 e.cidr = HOST_MASK - 1;
 416
 417         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 418                                  &e.port, &e.proto))
 419                 return -EINVAL;
 420
 421         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 422         ip6_netmask(&e.ip, e.cidr + 1);
 423
 424         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 425 }
 426
 427 static int
 428 hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[],
 429                    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 430 {
 431         const struct hash_netport *h = set->data;
 432         ipset_adtfn adtfn = set->variant->adt[adt];
 433         struct hash_netport6_elem e = { .cidr = HOST_MASK  - 1 };
 434         struct ip_set_ext ext = IP_SET_INIT_UEXT(h);
 435         u32 port, port_to;
 436         bool with_ports = false;
 437         u8 cidr;
 438         int ret;
 439
 440         if (unlikely(!tb[IPSET_ATTR_IP] ||
 441                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 442                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 443                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 444                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
 445                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 446                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 447                 return -IPSET_ERR_PROTOCOL;
 448         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 449                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 450
 451         if (tb[IPSET_ATTR_LINENO])
 452                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 453
 454         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
 455               ip_set_get_extensions(set, tb, &ext);
 456         if (ret)
 457                 return ret;
 458
 459         if (tb[IPSET_ATTR_CIDR]) {
 460                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 461                 if (!cidr || cidr > HOST_MASK)
 462                         return -IPSET_ERR_INVALID_CIDR;
 463                 e.cidr = cidr - 1;
 464         }
 465         ip6_netmask(&e.ip, e.cidr + 1);
 466
 467         if (tb[IPSET_ATTR_PORT])
 468                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 469         else
 470                 return -IPSET_ERR_PROTOCOL;
 471
 472         if (tb[IPSET_ATTR_PROTO]) {
 473                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 474                 with_ports = ip_set_proto_with_ports(e.proto);
 475
 476                 if (e.proto == 0)
 477                         return -IPSET_ERR_INVALID_PROTO;
 478         } else
 479                 return -IPSET_ERR_MISSING_PROTO;
 480
 481         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 482                 e.port = 0;
 483
 484         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 485                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 486                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 487                         flags |= (IPSET_FLAG_NOMATCH << 16);
 488         }
 489
 490         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 491                 ret = adtfn(set, &e, &ext, &ext, flags);
 492                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 493                        ip_set_eexist(ret, flags) ? 0 : ret;
 494         }
 495
 496         port = ntohs(e.port);
 497         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 498         if (port > port_to)
 499                 swap(port, port_to);
 500
 501         if (retried)
 502                 port = ntohs(h->next.port);
 503         for (; port <= port_to; port++) {
 504                 e.port = htons(port);
 505                 ret = adtfn(set, &e, &ext, &ext, flags);
 506
 507                 if (ret && !ip_set_eexist(ret, flags))
 508                         return ret;
 509                 else
 510                         ret = 0;
 511         }
 512         return ret;
 513 }
 514
 515 static struct ip_set_type hash_netport_type __read_mostly = {
 516         .name           = "hash:net,port",
 517         .protocol       = IPSET_PROTOCOL,
 518         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH,
 519         .dimension      = IPSET_DIM_TWO,
 520         .family         = NFPROTO_UNSPEC,
 521         .revision_min   = REVISION_MIN,
 522         .revision_max   = REVISION_MAX,
 523         .create         = hash_netport_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                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 532         },
 533         .adt_policy     = {
 534                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 535                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 536                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 537                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 538                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 539                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 540                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 541                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 542                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 543                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 544                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 545         },
 546         .me             = THIS_MODULE,
 547 };
 548
 549 static int __init
 550 hash_netport_init(void)
 551 {
 552         return ip_set_type_register(&hash_netport_type);
 553 }
 554
 555 static void __exit
 556 hash_netport_fini(void)
 557 {
 558         ip_set_type_unregister(&hash_netport_type);
 559 }
 560
 561 module_init(hash_netport_init);
 562 module_exit(hash_netport_fini);