net/netfilter/ipset/ip_set_hash_netnet.c

   1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
   2  * Copyright (C) 2013 Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 /* Kernel module implementing an IP set type: the hash:net type */
  10
  11 #include <linux/jhash.h>
  12 #include <linux/module.h>
  13 #include <linux/ip.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/errno.h>
  16 #include <linux/random.h>
  17 #include <net/ip.h>
  18 #include <net/ipv6.h>
  19 #include <net/netlink.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_hash.h>
  25
  26 #define IPSET_TYPE_REV_MIN      0
  27 /*                              1          Forceadd support added */
  28 #define IPSET_TYPE_REV_MAX      2       /* skbinfo support added */
  29
  30 MODULE_LICENSE("GPL");
  31 MODULE_AUTHOR("Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>");
  32 IP_SET_MODULE_DESC("hash:net,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  33 MODULE_ALIAS("ip_set_hash:net,net");
  34
  35 /* Type specific function prefix */
  36 #define HTYPE           hash_netnet
  37 #define IP_SET_HASH_WITH_NETS
  38 #define IPSET_NET_COUNT 2
  39
  40 /* IPv4 variants */
  41
  42 /* Member elements  */
  43 struct hash_netnet4_elem {
  44         union {
  45                 __be32 ip[2];
  46                 __be64 ipcmp;
  47         };
  48         u8 nomatch;
  49         u8 padding;
  50         union {
  51                 u8 cidr[2];
  52                 u16 ccmp;
  53         };
  54 };
  55
  56 /* Common functions */
  57
  58 static inline bool
  59 hash_netnet4_data_equal(const struct hash_netnet4_elem *ip1,
  60                         const struct hash_netnet4_elem *ip2,
  61                         u32 *multi)
  62 {
  63         return ip1->ipcmp == ip2->ipcmp &&
  64                ip1->ccmp == ip2->ccmp;
  65 }
  66
  67 static inline int
  68 hash_netnet4_do_data_match(const struct hash_netnet4_elem *elem)
  69 {
  70         return elem->nomatch ? -ENOTEMPTY : 1;
  71 }
  72
  73 static inline void
  74 hash_netnet4_data_set_flags(struct hash_netnet4_elem *elem, u32 flags)
  75 {
  76         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
  77 }
  78
  79 static inline void
  80 hash_netnet4_data_reset_flags(struct hash_netnet4_elem *elem, u8 *flags)
  81 {
  82         swap(*flags, elem->nomatch);
  83 }
  84
  85 static inline void
  86 hash_netnet4_data_reset_elem(struct hash_netnet4_elem *elem,
  87                              struct hash_netnet4_elem *orig)
  88 {
  89         elem->ip[1] = orig->ip[1];
  90 }
  91
  92 static inline void
  93 hash_netnet4_data_netmask(struct hash_netnet4_elem *elem, u8 cidr, bool inner)
  94 {
  95         if (inner) {
  96                 elem->ip[1] &= ip_set_netmask(cidr);
  97                 elem->cidr[1] = cidr;
  98         } else {
  99                 elem->ip[0] &= ip_set_netmask(cidr);
 100                 elem->cidr[0] = cidr;
 101         }
 102 }
 103
 104 static bool
 105 hash_netnet4_data_list(struct sk_buff *skb,
 106                        const struct hash_netnet4_elem *data)
 107 {
 108         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 109
 110         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip[0]) ||
 111             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip[1]) ||
 112             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
 113             nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
 114             (flags &&
 115              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 116                 goto nla_put_failure;
 117         return false;
 118
 119 nla_put_failure:
 120         return true;
 121 }
 122
 123 static inline void
 124 hash_netnet4_data_next(struct hash_netnet4_elem *next,
 125                        const struct hash_netnet4_elem *d)
 126 {
 127         next->ipcmp = d->ipcmp;
 128 }
 129
 130 #define MTYPE           hash_netnet4
 131 #define HOST_MASK       32
 132 #include "ip_set_hash_gen.h"
 133
 134 static void
 135 hash_netnet4_init(struct hash_netnet4_elem *e)
 136 {
 137         e->cidr[0] = HOST_MASK;
 138         e->cidr[1] = HOST_MASK;
 139 }
 140
 141 static int
 142 hash_netnet4_kadt(struct ip_set *set, const struct sk_buff *skb,
 143                   const struct xt_action_param *par,
 144                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
 145 {
 146         const struct hash_netnet *h = set->data;
 147         ipset_adtfn adtfn = set->variant->adt[adt];
 148         struct hash_netnet4_elem e = { };
 149         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 150
 151         e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
 152         e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
 153         if (adt == IPSET_TEST)
 154                 e.ccmp = (HOST_MASK << (sizeof(e.cidr[0]) * 8)) | HOST_MASK;
 155
 156         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0]);
 157         ip4addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1]);
 158         e.ip[0] &= ip_set_netmask(e.cidr[0]);
 159         e.ip[1] &= ip_set_netmask(e.cidr[1]);
 160
 161         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 162 }
 163
 164 static int
 165 hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[],
 166                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 167 {
 168         const struct hash_netnet *h = set->data;
 169         ipset_adtfn adtfn = set->variant->adt[adt];
 170         struct hash_netnet4_elem e = { };
 171         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 172         u32 ip = 0, ip_to = 0, last;
 173         u32 ip2 = 0, ip2_from = 0, ip2_to = 0, last2;
 174         int ret;
 175
 176         if (tb[IPSET_ATTR_LINENO])
 177                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 178
 179         hash_netnet4_init(&e);
 180         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 181                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 182                 return -IPSET_ERR_PROTOCOL;
 183
 184         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
 185         if (ret)
 186                 return ret;
 187
 188         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from);
 189         if (ret)
 190                 return ret;
 191
 192         ret = ip_set_get_extensions(set, tb, &ext);
 193         if (ret)
 194                 return ret;
 195
 196         if (tb[IPSET_ATTR_CIDR]) {
 197                 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 198                 if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
 199                         return -IPSET_ERR_INVALID_CIDR;
 200         }
 201
 202         if (tb[IPSET_ATTR_CIDR2]) {
 203                 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
 204                 if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
 205                         return -IPSET_ERR_INVALID_CIDR;
 206         }
 207
 208         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 209                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 210
 211                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 212                         flags |= (IPSET_FLAG_NOMATCH << 16);
 213         }
 214
 215         if (adt == IPSET_TEST || !(tb[IPSET_ATTR_IP_TO] ||
 216                                    tb[IPSET_ATTR_IP2_TO])) {
 217                 e.ip[0] = htonl(ip & ip_set_hostmask(e.cidr[0]));
 218                 e.ip[1] = htonl(ip2_from & 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         ip_to = ip;
 225         if (tb[IPSET_ATTR_IP_TO]) {
 226                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 227                 if (ret)
 228                         return ret;
 229                 if (ip_to < ip)
 230                         swap(ip, ip_to);
 231                 if (unlikely(ip + UINT_MAX == ip_to))
 232                         return -IPSET_ERR_HASH_RANGE;
 233         } else {
 234                 ip_set_mask_from_to(ip, ip_to, e.cidr[0]);
 235         }
 236
 237         ip2_to = ip2_from;
 238         if (tb[IPSET_ATTR_IP2_TO]) {
 239                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
 240                 if (ret)
 241                         return ret;
 242                 if (ip2_to < ip2_from)
 243                         swap(ip2_from, ip2_to);
 244                 if (unlikely(ip2_from + UINT_MAX == ip2_to))
 245                         return -IPSET_ERR_HASH_RANGE;
 246         } else {
 247                 ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]);
 248         }
 249
 250         if (retried)
 251                 ip = ntohl(h->next.ip[0]);
 252
 253         while (!after(ip, ip_to)) {
 254                 e.ip[0] = htonl(ip);
 255                 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr[0]);
 256                 ip2 = (retried &&
 257                        ip == ntohl(h->next.ip[0])) ? ntohl(h->next.ip[1])
 258                                                    : ip2_from;
 259                 while (!after(ip2, ip2_to)) {
 260                         e.ip[1] = htonl(ip2);
 261                         last2 = ip_set_range_to_cidr(ip2, ip2_to, &e.cidr[1]);
 262                         ret = adtfn(set, &e, &ext, &ext, flags);
 263                         if (ret && !ip_set_eexist(ret, flags))
 264                                 return ret;
 265
 266                         ret = 0;
 267                         ip2 = last2 + 1;
 268                 }
 269                 ip = last + 1;
 270         }
 271         return ret;
 272 }
 273
 274 /* IPv6 variants */
 275
 276 struct hash_netnet6_elem {
 277         union nf_inet_addr ip[2];
 278         u8 nomatch;
 279         u8 padding;
 280         union {
 281                 u8 cidr[2];
 282                 u16 ccmp;
 283         };
 284 };
 285
 286 /* Common functions */
 287
 288 static inline bool
 289 hash_netnet6_data_equal(const struct hash_netnet6_elem *ip1,
 290                         const struct hash_netnet6_elem *ip2,
 291                         u32 *multi)
 292 {
 293         return ipv6_addr_equal(&ip1->ip[0].in6, &ip2->ip[0].in6) &&
 294                ipv6_addr_equal(&ip1->ip[1].in6, &ip2->ip[1].in6) &&
 295                ip1->ccmp == ip2->ccmp;
 296 }
 297
 298 static inline int
 299 hash_netnet6_do_data_match(const struct hash_netnet6_elem *elem)
 300 {
 301         return elem->nomatch ? -ENOTEMPTY : 1;
 302 }
 303
 304 static inline void
 305 hash_netnet6_data_set_flags(struct hash_netnet6_elem *elem, u32 flags)
 306 {
 307         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
 308 }
 309
 310 static inline void
 311 hash_netnet6_data_reset_flags(struct hash_netnet6_elem *elem, u8 *flags)
 312 {
 313         swap(*flags, elem->nomatch);
 314 }
 315
 316 static inline void
 317 hash_netnet6_data_reset_elem(struct hash_netnet6_elem *elem,
 318                              struct hash_netnet6_elem *orig)
 319 {
 320         elem->ip[1] = orig->ip[1];
 321 }
 322
 323 static inline void
 324 hash_netnet6_data_netmask(struct hash_netnet6_elem *elem, u8 cidr, bool inner)
 325 {
 326         if (inner) {
 327                 ip6_netmask(&elem->ip[1], cidr);
 328                 elem->cidr[1] = cidr;
 329         } else {
 330                 ip6_netmask(&elem->ip[0], cidr);
 331                 elem->cidr[0] = cidr;
 332         }
 333 }
 334
 335 static bool
 336 hash_netnet6_data_list(struct sk_buff *skb,
 337                        const struct hash_netnet6_elem *data)
 338 {
 339         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 340
 341         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip[0].in6) ||
 342             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip[1].in6) ||
 343             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
 344             nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
 345             (flags &&
 346              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 347                 goto nla_put_failure;
 348         return false;
 349
 350 nla_put_failure:
 351         return true;
 352 }
 353
 354 static inline void
 355 hash_netnet6_data_next(struct hash_netnet4_elem *next,
 356                        const struct hash_netnet6_elem *d)
 357 {
 358 }
 359
 360 #undef MTYPE
 361 #undef HOST_MASK
 362
 363 #define MTYPE           hash_netnet6
 364 #define HOST_MASK       128
 365 #define IP_SET_EMIT_CREATE
 366 #include "ip_set_hash_gen.h"
 367
 368 static void
 369 hash_netnet6_init(struct hash_netnet6_elem *e)
 370 {
 371         e->cidr[0] = HOST_MASK;
 372         e->cidr[1] = HOST_MASK;
 373 }
 374
 375 static int
 376 hash_netnet6_kadt(struct ip_set *set, const struct sk_buff *skb,
 377                   const struct xt_action_param *par,
 378                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
 379 {
 380         const struct hash_netnet *h = set->data;
 381         ipset_adtfn adtfn = set->variant->adt[adt];
 382         struct hash_netnet6_elem e = { };
 383         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 384
 385         e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
 386         e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
 387         if (adt == IPSET_TEST)
 388                 e.ccmp = (HOST_MASK << (sizeof(u8) * 8)) | HOST_MASK;
 389
 390         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0].in6);
 391         ip6addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1].in6);
 392         ip6_netmask(&e.ip[0], e.cidr[0]);
 393         ip6_netmask(&e.ip[1], e.cidr[1]);
 394
 395         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 396 }
 397
 398 static int
 399 hash_netnet6_uadt(struct ip_set *set, struct nlattr *tb[],
 400                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 401 {
 402         ipset_adtfn adtfn = set->variant->adt[adt];
 403         struct hash_netnet6_elem e = { };
 404         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 405         int ret;
 406
 407         if (tb[IPSET_ATTR_LINENO])
 408                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 409
 410         hash_netnet6_init(&e);
 411         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 412                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 413                 return -IPSET_ERR_PROTOCOL;
 414         if (unlikely(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_IP2_TO]))
 415                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 416
 417         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip[0]);
 418         if (ret)
 419                 return ret;
 420
 421         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip[1]);
 422         if (ret)
 423                 return ret;
 424
 425         ret = ip_set_get_extensions(set, tb, &ext);
 426         if (ret)
 427                 return ret;
 428
 429         if (tb[IPSET_ATTR_CIDR]) {
 430                 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 431                 if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
 432                         return -IPSET_ERR_INVALID_CIDR;
 433         }
 434
 435         if (tb[IPSET_ATTR_CIDR2]) {
 436                 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
 437                 if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
 438                         return -IPSET_ERR_INVALID_CIDR;
 439         }
 440
 441         ip6_netmask(&e.ip[0], e.cidr[0]);
 442         ip6_netmask(&e.ip[1], e.cidr[1]);
 443
 444         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 445                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 446
 447                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 448                         flags |= (IPSET_FLAG_NOMATCH << 16);
 449         }
 450
 451         ret = adtfn(set, &e, &ext, &ext, flags);
 452
 453         return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 454                ip_set_eexist(ret, flags) ? 0 : ret;
 455 }
 456
 457 static struct ip_set_type hash_netnet_type __read_mostly = {
 458         .name           = "hash:net,net",
 459         .protocol       = IPSET_PROTOCOL,
 460         .features       = IPSET_TYPE_IP | IPSET_TYPE_IP2 | IPSET_TYPE_NOMATCH,
 461         .dimension      = IPSET_DIM_TWO,
 462         .family         = NFPROTO_UNSPEC,
 463         .revision_min   = IPSET_TYPE_REV_MIN,
 464         .revision_max   = IPSET_TYPE_REV_MAX,
 465         .create         = hash_netnet_create,
 466         .create_policy  = {
 467                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 468                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 469                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 470                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 471                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 472                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 473         },
 474         .adt_policy     = {
 475                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 476                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 477                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
 478                 [IPSET_ATTR_IP2_TO]     = { .type = NLA_NESTED },
 479                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 480                 [IPSET_ATTR_CIDR2]      = { .type = NLA_U8 },
 481                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 482                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 483                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 484                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 485                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 486                                             .len  = IPSET_MAX_COMMENT_SIZE },
 487                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 488                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 489                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 490         },
 491         .me             = THIS_MODULE,
 492 };
 493
 494 static int __init
 495 hash_netnet_init(void)
 496 {
 497         return ip_set_type_register(&hash_netnet_type);
 498 }
 499
 500 static void __exit
 501 hash_netnet_fini(void)
 502 {
 503         rcu_barrier();
 504         ip_set_type_unregister(&hash_netnet_type);
 505 }
 506
 507 module_init(hash_netnet_init);
 508 module_exit(hash_netnet_fini);