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 #define IPSET_TYPE_REV_MAX      5 /* Comments support added */
  32
  33 MODULE_LICENSE("GPL");
  34 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  35 IP_SET_MODULE_DESC("hash:net,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  36 MODULE_ALIAS("ip_set_hash:net,port");
  37
  38 /* Type specific function prefix */
  39 #define HTYPE           hash_netport
  40 #define IP_SET_HASH_WITH_PROTO
  41 #define IP_SET_HASH_WITH_NETS
  42
  43 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0
  44  * However this way we have to store internally cidr - 1,
  45  * dancing back and forth.
  46  */
  47 #define IP_SET_HASH_WITH_NETS_PACKED
  48
  49 /* IPv4 variant */
  50
  51 /* Member elements */
  52 struct hash_netport4_elem {
  53         __be32 ip;
  54         __be16 port;
  55         u8 proto;
  56         u8 cidr:7;
  57         u8 nomatch:1;
  58 };
  59
  60 /* Common functions */
  61
  62 static inline bool
  63 hash_netport4_data_equal(const struct hash_netport4_elem *ip1,
  64                          const struct hash_netport4_elem *ip2,
  65                          u32 *multi)
  66 {
  67         return ip1->ip == ip2->ip &&
  68                ip1->port == ip2->port &&
  69                ip1->proto == ip2->proto &&
  70                ip1->cidr == ip2->cidr;
  71 }
  72
  73 static inline int
  74 hash_netport4_do_data_match(const struct hash_netport4_elem *elem)
  75 {
  76         return elem->nomatch ? -ENOTEMPTY : 1;
  77 }
  78
  79 static inline void
  80 hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags)
  81 {
  82         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
  83 }
  84
  85 static inline void
  86 hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags)
  87 {
  88         swap(*flags, elem->nomatch);
  89 }
  90
  91 static inline void
  92 hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr)
  93 {
  94         elem->ip &= ip_set_netmask(cidr);
  95         elem->cidr = cidr - 1;
  96 }
  97
  98 static bool
  99 hash_netport4_data_list(struct sk_buff *skb,
 100                         const struct hash_netport4_elem *data)
 101 {
 102         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 103
 104         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 105             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 106             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
 107             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 108             (flags &&
 109              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 110                 goto nla_put_failure;
 111         return 0;
 112
 113 nla_put_failure:
 114         return 1;
 115 }
 116
 117 static inline void
 118 hash_netport4_data_next(struct hash_netport4_elem *next,
 119                         const struct hash_netport4_elem *d)
 120 {
 121         next->ip = d->ip;
 122         next->port = d->port;
 123 }
 124
 125 #define MTYPE           hash_netport4
 126 #define PF              4
 127 #define HOST_MASK       32
 128 #include "ip_set_hash_gen.h"
 129
 130 static int
 131 hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 132                    const struct xt_action_param *par,
 133                    enum ipset_adt adt, struct ip_set_adt_opt *opt)
 134 {
 135         const struct hash_netport *h = set->data;
 136         ipset_adtfn adtfn = set->variant->adt[adt];
 137         struct hash_netport4_elem e = {
 138                 .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK) - 1,
 139         };
 140         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 141
 142         if (adt == IPSET_TEST)
 143                 e.cidr = HOST_MASK - 1;
 144
 145         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 146                                  &e.port, &e.proto))
 147                 return -EINVAL;
 148
 149         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 150         e.ip &= ip_set_netmask(e.cidr + 1);
 151
 152         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 153 }
 154
 155 static int
 156 hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
 157                    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 158 {
 159         const struct hash_netport *h = set->data;
 160         ipset_adtfn adtfn = set->variant->adt[adt];
 161         struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 };
 162         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 163         u32 port, port_to, p = 0, ip = 0, ip_to = 0, last;
 164         bool with_ports = false;
 165         u8 cidr;
 166         int ret;
 167
 168         if (unlikely(!tb[IPSET_ATTR_IP] ||
 169                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 170                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 171                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 172                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
 173                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 174                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 175                 return -IPSET_ERR_PROTOCOL;
 176
 177         if (tb[IPSET_ATTR_LINENO])
 178                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 179
 180         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
 181               ip_set_get_extensions(set, tb, &ext);
 182         if (ret)
 183                 return ret;
 184
 185         if (tb[IPSET_ATTR_CIDR]) {
 186                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 187                 if (!cidr || cidr > HOST_MASK)
 188                         return -IPSET_ERR_INVALID_CIDR;
 189                 e.cidr = cidr - 1;
 190         }
 191
 192         if (tb[IPSET_ATTR_PORT])
 193                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 194         else
 195                 return -IPSET_ERR_PROTOCOL;
 196
 197         if (tb[IPSET_ATTR_PROTO]) {
 198                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 199                 with_ports = ip_set_proto_with_ports(e.proto);
 200
 201                 if (e.proto == 0)
 202                         return -IPSET_ERR_INVALID_PROTO;
 203         } else
 204                 return -IPSET_ERR_MISSING_PROTO;
 205
 206         if (!(with_ports || e.proto == IPPROTO_ICMP))
 207                 e.port = 0;
 208
 209         with_ports = with_ports && tb[IPSET_ATTR_PORT_TO];
 210
 211         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 212                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 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         if (retried)
 242                 ip = ntohl(h->next.ip);
 243         while (!after(ip, ip_to)) {
 244                 e.ip = htonl(ip);
 245                 last = ip_set_range_to_cidr(ip, ip_to, &cidr);
 246                 e.cidr = cidr - 1;
 247                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 248                                                        : port;
 249                 for (; p <= port_to; p++) {
 250                         e.port = htons(p);
 251                         ret = adtfn(set, &e, &ext, &ext, flags);
 252
 253                         if (ret && !ip_set_eexist(ret, flags))
 254                                 return ret;
 255                         else
 256                                 ret = 0;
 257                 }
 258                 ip = last + 1;
 259         }
 260         return ret;
 261 }
 262
 263 /* IPv6 variant */
 264
 265 struct hash_netport6_elem {
 266         union nf_inet_addr ip;
 267         __be16 port;
 268         u8 proto;
 269         u8 cidr:7;
 270         u8 nomatch:1;
 271 };
 272
 273 /* Common functions */
 274
 275 static inline bool
 276 hash_netport6_data_equal(const struct hash_netport6_elem *ip1,
 277                          const struct hash_netport6_elem *ip2,
 278                          u32 *multi)
 279 {
 280         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 281                ip1->port == ip2->port &&
 282                ip1->proto == ip2->proto &&
 283                ip1->cidr == ip2->cidr;
 284 }
 285
 286 static inline int
 287 hash_netport6_do_data_match(const struct hash_netport6_elem *elem)
 288 {
 289         return elem->nomatch ? -ENOTEMPTY : 1;
 290 }
 291
 292 static inline void
 293 hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags)
 294 {
 295         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
 296 }
 297
 298 static inline void
 299 hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags)
 300 {
 301         swap(*flags, elem->nomatch);
 302 }
 303
 304 static inline void
 305 hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr)
 306 {
 307         ip6_netmask(&elem->ip, cidr);
 308         elem->cidr = cidr - 1;
 309 }
 310
 311 static bool
 312 hash_netport6_data_list(struct sk_buff *skb,
 313                         const struct hash_netport6_elem *data)
 314 {
 315         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 316
 317         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 318             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 319             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
 320             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 321             (flags &&
 322              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 323                 goto nla_put_failure;
 324         return 0;
 325
 326 nla_put_failure:
 327         return 1;
 328 }
 329
 330 static inline void
 331 hash_netport6_data_next(struct hash_netport4_elem *next,
 332                         const struct hash_netport6_elem *d)
 333 {
 334         next->port = d->port;
 335 }
 336
 337 #undef MTYPE
 338 #undef PF
 339 #undef HOST_MASK
 340
 341 #define MTYPE           hash_netport6
 342 #define PF              6
 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_netport *h = set->data;
 353         ipset_adtfn adtfn = set->variant->adt[adt];
 354         struct hash_netport6_elem e = {
 355                 .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK) - 1,
 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_netport *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 (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                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
 390                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 391                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 392                 return -IPSET_ERR_PROTOCOL;
 393         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 394                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 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], &e.ip) ||
 400               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         if (tb[IPSET_ATTR_PORT])
 413                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 414         else
 415                 return -IPSET_ERR_PROTOCOL;
 416
 417         if (tb[IPSET_ATTR_PROTO]) {
 418                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 419                 with_ports = ip_set_proto_with_ports(e.proto);
 420
 421                 if (e.proto == 0)
 422                         return -IPSET_ERR_INVALID_PROTO;
 423         } else
 424                 return -IPSET_ERR_MISSING_PROTO;
 425
 426         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 427                 e.port = 0;
 428
 429         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 430                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 431                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 432                         flags |= (IPSET_FLAG_NOMATCH << 16);
 433         }
 434
 435         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 436                 ret = adtfn(set, &e, &ext, &ext, flags);
 437                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 438                        ip_set_eexist(ret, flags) ? 0 : ret;
 439         }
 440
 441         port = ntohs(e.port);
 442         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 443         if (port > port_to)
 444                 swap(port, port_to);
 445
 446         if (retried)
 447                 port = ntohs(h->next.port);
 448         for (; port <= port_to; port++) {
 449                 e.port = htons(port);
 450                 ret = adtfn(set, &e, &ext, &ext, flags);
 451
 452                 if (ret && !ip_set_eexist(ret, flags))
 453                         return ret;
 454                 else
 455                         ret = 0;
 456         }
 457         return ret;
 458 }
 459
 460 static struct ip_set_type hash_netport_type __read_mostly = {
 461         .name           = "hash:net,port",
 462         .protocol       = IPSET_PROTOCOL,
 463         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH,
 464         .dimension      = IPSET_DIM_TWO,
 465         .family         = NFPROTO_UNSPEC,
 466         .revision_min   = IPSET_TYPE_REV_MIN,
 467         .revision_max   = IPSET_TYPE_REV_MAX,
 468         .create         = hash_netport_create,
 469         .create_policy  = {
 470                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 471                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 472                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 473                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 474                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 475                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 476                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 477         },
 478         .adt_policy     = {
 479                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 480                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 481                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 482                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 483                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 484                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 485                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 486                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 487                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 488                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 489                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 490                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
 491         },
 492         .me             = THIS_MODULE,
 493 };
 494
 495 static int __init
 496 hash_netport_init(void)
 497 {
 498         return ip_set_type_register(&hash_netport_type);
 499 }
 500
 501 static void __exit
 502 hash_netport_fini(void)
 503 {
 504         ip_set_type_unregister(&hash_netport_type);
 505 }
 506
 507 module_init(hash_netport_init);
 508 module_exit(hash_netport_fini);