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 IPSET_TYPE_REV_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 /*                              4    Counters support added */
  31 /*                              5    Comments support added */
  32 /*                              6    Forceadd support added */
  33 #define IPSET_TYPE_REV_MAX      7 /* skbinfo support added */
  34
  35 MODULE_LICENSE("GPL");
  36 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  37 IP_SET_MODULE_DESC("hash:net,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  38 MODULE_ALIAS("ip_set_hash:net,port");
  39
  40 /* Type specific function prefix */
  41 #define HTYPE           hash_netport
  42 #define IP_SET_HASH_WITH_PROTO
  43 #define IP_SET_HASH_WITH_NETS
  44
  45 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0
  46  * However this way we have to store internally cidr - 1,
  47  * dancing back and forth.
  48  */
  49 #define IP_SET_HASH_WITH_NETS_PACKED
  50
  51 /* IPv4 variant */
  52
  53 /* Member elements */
  54 struct hash_netport4_elem {
  55         __be32 ip;
  56         __be16 port;
  57         u8 proto;
  58         u8 cidr:7;
  59         u8 nomatch:1;
  60 };
  61
  62 /* Common functions */
  63
  64 static inline bool
  65 hash_netport4_data_equal(const struct hash_netport4_elem *ip1,
  66                          const struct hash_netport4_elem *ip2,
  67                          u32 *multi)
  68 {
  69         return ip1->ip == ip2->ip &&
  70                ip1->port == ip2->port &&
  71                ip1->proto == ip2->proto &&
  72                ip1->cidr == ip2->cidr;
  73 }
  74
  75 static inline int
  76 hash_netport4_do_data_match(const struct hash_netport4_elem *elem)
  77 {
  78         return elem->nomatch ? -ENOTEMPTY : 1;
  79 }
  80
  81 static inline void
  82 hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags)
  83 {
  84         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
  85 }
  86
  87 static inline void
  88 hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags)
  89 {
  90         swap(*flags, elem->nomatch);
  91 }
  92
  93 static inline void
  94 hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr)
  95 {
  96         elem->ip &= ip_set_netmask(cidr);
  97         elem->cidr = cidr - 1;
  98 }
  99
 100 static bool
 101 hash_netport4_data_list(struct sk_buff *skb,
 102                         const struct hash_netport4_elem *data)
 103 {
 104         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 105
 106         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 107             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 108             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
 109             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 110             (flags &&
 111              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 112                 goto nla_put_failure;
 113         return false;
 114
 115 nla_put_failure:
 116         return true;
 117 }
 118
 119 static inline void
 120 hash_netport4_data_next(struct hash_netport4_elem *next,
 121                         const struct hash_netport4_elem *d)
 122 {
 123         next->ip = d->ip;
 124         next->port = d->port;
 125 }
 126
 127 #define MTYPE           hash_netport4
 128 #define HOST_MASK       32
 129 #include "ip_set_hash_gen.h"
 130
 131 static int
 132 hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 133                    const struct xt_action_param *par,
 134                    enum ipset_adt adt, struct ip_set_adt_opt *opt)
 135 {
 136         const struct hash_netport4 *h = set->data;
 137         ipset_adtfn adtfn = set->variant->adt[adt];
 138         struct hash_netport4_elem e = {
 139                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 140         };
 141         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 142
 143         if (adt == IPSET_TEST)
 144                 e.cidr = HOST_MASK - 1;
 145
 146         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 147                                  &e.port, &e.proto))
 148                 return -EINVAL;
 149
 150         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 151         e.ip &= ip_set_netmask(e.cidr + 1);
 152
 153         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 154 }
 155
 156 static int
 157 hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
 158                    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 159 {
 160         const struct hash_netport4 *h = set->data;
 161         ipset_adtfn adtfn = set->variant->adt[adt];
 162         struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 };
 163         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 164         u32 port, port_to, p = 0, ip = 0, ip_to = 0;
 165         bool with_ports = false;
 166         u8 cidr;
 167         int ret;
 168
 169         if (tb[IPSET_ATTR_LINENO])
 170                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 171
 172         if (unlikely(!tb[IPSET_ATTR_IP] ||
 173                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 174                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 175                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 176                 return -IPSET_ERR_PROTOCOL;
 177
 178         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
 179         if (ret)
 180                 return ret;
 181
 182         ret = ip_set_get_extensions(set, tb, &ext);
 183         if (ret)
 184                 return ret;
 185
 186         if (tb[IPSET_ATTR_CIDR]) {
 187                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 188                 if (!cidr || cidr > HOST_MASK)
 189                         return -IPSET_ERR_INVALID_CIDR;
 190                 e.cidr = cidr - 1;
 191         }
 192
 193         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 194
 195         if (tb[IPSET_ATTR_PROTO]) {
 196                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 197                 with_ports = ip_set_proto_with_ports(e.proto);
 198
 199                 if (e.proto == 0)
 200                         return -IPSET_ERR_INVALID_PROTO;
 201         } else {
 202                 return -IPSET_ERR_MISSING_PROTO;
 203         }
 204
 205         if (!(with_ports || e.proto == IPPROTO_ICMP))
 206                 e.port = 0;
 207
 208         with_ports = with_ports && tb[IPSET_ATTR_PORT_TO];
 209
 210         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 211                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 212
 213                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 214                         flags |= (IPSET_FLAG_NOMATCH << 16);
 215         }
 216
 217         if (adt == IPSET_TEST || !(with_ports || tb[IPSET_ATTR_IP_TO])) {
 218                 e.ip = htonl(ip & ip_set_hostmask(e.cidr + 1));
 219                 ret = adtfn(set, &e, &ext, &ext, flags);
 220                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 221                        ip_set_eexist(ret, flags) ? 0 : ret;
 222         }
 223
 224         port = port_to = ntohs(e.port);
 225         if (tb[IPSET_ATTR_PORT_TO]) {
 226                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 227                 if (port_to < port)
 228                         swap(port, port_to);
 229         }
 230         if (tb[IPSET_ATTR_IP_TO]) {
 231                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 232                 if (ret)
 233                         return ret;
 234                 if (ip_to < ip)
 235                         swap(ip, ip_to);
 236                 if (ip + UINT_MAX == ip_to)
 237                         return -IPSET_ERR_HASH_RANGE;
 238         } else {
 239                 ip_set_mask_from_to(ip, ip_to, e.cidr + 1);
 240         }
 241
 242         if (retried) {
 243                 ip = ntohl(h->next.ip);
 244                 p = ntohs(h->next.port);
 245         } else {
 246                 p = port;
 247         }
 248         do {
 249                 e.ip = htonl(ip);
 250                 ip = ip_set_range_to_cidr(ip, ip_to, &cidr);
 251                 e.cidr = cidr - 1;
 252                 for (; p <= port_to; p++) {
 253                         e.port = htons(p);
 254                         ret = adtfn(set, &e, &ext, &ext, flags);
 255                         if (ret && !ip_set_eexist(ret, flags))
 256                                 return ret;
 257
 258                         ret = 0;
 259                 }
 260                 p = port;
 261         } while (ip++ < ip_to);
 262         return ret;
 263 }
 264
 265 /* IPv6 variant */
 266
 267 struct hash_netport6_elem {
 268         union nf_inet_addr ip;
 269         __be16 port;
 270         u8 proto;
 271         u8 cidr:7;
 272         u8 nomatch:1;
 273 };
 274
 275 /* Common functions */
 276
 277 static inline bool
 278 hash_netport6_data_equal(const struct hash_netport6_elem *ip1,
 279                          const struct hash_netport6_elem *ip2,
 280                          u32 *multi)
 281 {
 282         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 283                ip1->port == ip2->port &&
 284                ip1->proto == ip2->proto &&
 285                ip1->cidr == ip2->cidr;
 286 }
 287
 288 static inline int
 289 hash_netport6_do_data_match(const struct hash_netport6_elem *elem)
 290 {
 291         return elem->nomatch ? -ENOTEMPTY : 1;
 292 }
 293
 294 static inline void
 295 hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags)
 296 {
 297         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
 298 }
 299
 300 static inline void
 301 hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags)
 302 {
 303         swap(*flags, elem->nomatch);
 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 - 1;
 311 }
 312
 313 static bool
 314 hash_netport6_data_list(struct sk_buff *skb,
 315                         const struct hash_netport6_elem *data)
 316 {
 317         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 318
 319         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 320             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 321             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
 322             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 323             (flags &&
 324              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 325                 goto nla_put_failure;
 326         return false;
 327
 328 nla_put_failure:
 329         return true;
 330 }
 331
 332 static inline void
 333 hash_netport6_data_next(struct hash_netport6_elem *next,
 334                         const struct hash_netport6_elem *d)
 335 {
 336         next->port = d->port;
 337 }
 338
 339 #undef MTYPE
 340 #undef HOST_MASK
 341
 342 #define MTYPE           hash_netport6
 343 #define HOST_MASK       128
 344 #define IP_SET_EMIT_CREATE
 345 #include "ip_set_hash_gen.h"
 346
 347 static int
 348 hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 349                    const struct xt_action_param *par,
 350                    enum ipset_adt adt, struct ip_set_adt_opt *opt)
 351 {
 352         const struct hash_netport6 *h = set->data;
 353         ipset_adtfn adtfn = set->variant->adt[adt];
 354         struct hash_netport6_elem e = {
 355                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 356         };
 357         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 358
 359         if (adt == IPSET_TEST)
 360                 e.cidr = HOST_MASK - 1;
 361
 362         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 363                                  &e.port, &e.proto))
 364                 return -EINVAL;
 365
 366         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 367         ip6_netmask(&e.ip, e.cidr + 1);
 368
 369         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 370 }
 371
 372 static int
 373 hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[],
 374                    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 375 {
 376         const struct hash_netport6 *h = set->data;
 377         ipset_adtfn adtfn = set->variant->adt[adt];
 378         struct hash_netport6_elem e = { .cidr = HOST_MASK  - 1 };
 379         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 380         u32 port, port_to;
 381         bool with_ports = false;
 382         u8 cidr;
 383         int ret;
 384
 385         if (tb[IPSET_ATTR_LINENO])
 386                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 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_CADT_FLAGS)))
 392                 return -IPSET_ERR_PROTOCOL;
 393         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 394                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 395
 396         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 397         if (ret)
 398                 return ret;
 399
 400         ret = ip_set_get_extensions(set, tb, &ext);
 401         if (ret)
 402                 return ret;
 403
 404         if (tb[IPSET_ATTR_CIDR]) {
 405                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 406                 if (!cidr || cidr > HOST_MASK)
 407                         return -IPSET_ERR_INVALID_CIDR;
 408                 e.cidr = cidr - 1;
 409         }
 410         ip6_netmask(&e.ip, e.cidr + 1);
 411
 412         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 413
 414         if (tb[IPSET_ATTR_PROTO]) {
 415                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 416                 with_ports = ip_set_proto_with_ports(e.proto);
 417
 418                 if (e.proto == 0)
 419                         return -IPSET_ERR_INVALID_PROTO;
 420         } else {
 421                 return -IPSET_ERR_MISSING_PROTO;
 422         }
 423
 424         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 425                 e.port = 0;
 426
 427         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 428                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 429
 430                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 431                         flags |= (IPSET_FLAG_NOMATCH << 16);
 432         }
 433
 434         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 435                 ret = adtfn(set, &e, &ext, &ext, flags);
 436                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 437                        ip_set_eexist(ret, flags) ? 0 : ret;
 438         }
 439
 440         port = ntohs(e.port);
 441         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 442         if (port > port_to)
 443                 swap(port, port_to);
 444
 445         if (retried)
 446                 port = ntohs(h->next.port);
 447         for (; port <= port_to; port++) {
 448                 e.port = htons(port);
 449                 ret = adtfn(set, &e, &ext, &ext, flags);
 450
 451                 if (ret && !ip_set_eexist(ret, flags))
 452                         return ret;
 453
 454                 ret = 0;
 455         }
 456         return ret;
 457 }
 458
 459 static struct ip_set_type hash_netport_type __read_mostly = {
 460         .name           = "hash:net,port",
 461         .protocol       = IPSET_PROTOCOL,
 462         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH,
 463         .dimension      = IPSET_DIM_TWO,
 464         .family         = NFPROTO_UNSPEC,
 465         .revision_min   = IPSET_TYPE_REV_MIN,
 466         .revision_max   = IPSET_TYPE_REV_MAX,
 467         .create         = hash_netport_create,
 468         .create_policy  = {
 469                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 470                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 471                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 472                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 473                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 474                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 475                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 476         },
 477         .adt_policy     = {
 478                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 479                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 480                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 481                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 482                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 483                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 484                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 485                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 486                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 487                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 488                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 489                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 490                                             .len  = IPSET_MAX_COMMENT_SIZE },
 491                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 492                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 493                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 494         },
 495         .me             = THIS_MODULE,
 496 };
 497
 498 static int __init
 499 hash_netport_init(void)
 500 {
 501         return ip_set_type_register(&hash_netport_type);
 502 }
 503
 504 static void __exit
 505 hash_netport_fini(void)
 506 {
 507         rcu_barrier();
 508         ip_set_type_unregister(&hash_netport_type);
 509 }
 510
 511 module_init(hash_netport_init);
 512 module_exit(hash_netport_fini);