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 int
 135 hash_netnet4_kadt(struct ip_set *set, const struct sk_buff *skb,
 136                   const struct xt_action_param *par,
 137                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
 138 {
 139         const struct hash_netnet *h = set->data;
 140         ipset_adtfn adtfn = set->variant->adt[adt];
 141         struct hash_netnet4_elem e = { };
 142         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 143
 144         e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
 145         e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
 146         if (adt == IPSET_TEST)
 147                 e.ccmp = (HOST_MASK << (sizeof(e.cidr[0]) * 8)) | HOST_MASK;
 148
 149         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0]);
 150         ip4addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1]);
 151         e.ip[0] &= ip_set_netmask(e.cidr[0]);
 152         e.ip[1] &= ip_set_netmask(e.cidr[1]);
 153
 154         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 155 }
 156
 157 static int
 158 hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[],
 159                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 160 {
 161         const struct hash_netnet *h = set->data;
 162         ipset_adtfn adtfn = set->variant->adt[adt];
 163         struct hash_netnet4_elem e = { .cidr = { HOST_MASK, HOST_MASK, }, };
 164         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 165         u32 ip = 0, ip_to = 0, last;
 166         u32 ip2 = 0, ip2_from = 0, ip2_to = 0, last2;
 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] || !tb[IPSET_ATTR_IP2] ||
 173                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 174                 return -IPSET_ERR_PROTOCOL;
 175
 176         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
 177         if (ret)
 178                 return ret;
 179
 180         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from);
 181         if (ret)
 182                 return ret;
 183
 184         ret = ip_set_get_extensions(set, tb, &ext);
 185         if (ret)
 186                 return ret;
 187
 188         if (tb[IPSET_ATTR_CIDR]) {
 189                 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 190                 if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
 191                         return -IPSET_ERR_INVALID_CIDR;
 192         }
 193
 194         if (tb[IPSET_ATTR_CIDR2]) {
 195                 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
 196                 if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
 197                         return -IPSET_ERR_INVALID_CIDR;
 198         }
 199
 200         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 201                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 202
 203                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 204                         flags |= (IPSET_FLAG_NOMATCH << 16);
 205         }
 206
 207         if (adt == IPSET_TEST || !(tb[IPSET_ATTR_IP_TO] ||
 208                                    tb[IPSET_ATTR_IP2_TO])) {
 209                 e.ip[0] = htonl(ip & ip_set_hostmask(e.cidr[0]));
 210                 e.ip[1] = htonl(ip2_from & ip_set_hostmask(e.cidr[1]));
 211                 ret = adtfn(set, &e, &ext, &ext, flags);
 212                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 213                        ip_set_eexist(ret, flags) ? 0 : ret;
 214         }
 215
 216         ip_to = ip;
 217         if (tb[IPSET_ATTR_IP_TO]) {
 218                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 219                 if (ret)
 220                         return ret;
 221                 if (ip_to < ip)
 222                         swap(ip, ip_to);
 223                 if (unlikely(ip + UINT_MAX == ip_to))
 224                         return -IPSET_ERR_HASH_RANGE;
 225         } else {
 226                 ip_set_mask_from_to(ip, ip_to, e.cidr[0]);
 227         }
 228
 229         ip2_to = ip2_from;
 230         if (tb[IPSET_ATTR_IP2_TO]) {
 231                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
 232                 if (ret)
 233                         return ret;
 234                 if (ip2_to < ip2_from)
 235                         swap(ip2_from, ip2_to);
 236                 if (unlikely(ip2_from + UINT_MAX == ip2_to))
 237                         return -IPSET_ERR_HASH_RANGE;
 238         } else {
 239                 ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]);
 240         }
 241
 242         if (retried)
 243                 ip = ntohl(h->next.ip[0]);
 244
 245         while (!after(ip, ip_to)) {
 246                 e.ip[0] = htonl(ip);
 247                 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr[0]);
 248                 ip2 = (retried &&
 249                        ip == ntohl(h->next.ip[0])) ? ntohl(h->next.ip[1])
 250                                                    : ip2_from;
 251                 while (!after(ip2, ip2_to)) {
 252                         e.ip[1] = htonl(ip2);
 253                         last2 = ip_set_range_to_cidr(ip2, ip2_to, &e.cidr[1]);
 254                         ret = adtfn(set, &e, &ext, &ext, flags);
 255                         if (ret && !ip_set_eexist(ret, flags))
 256                                 return ret;
 257
 258                         ret = 0;
 259                         ip2 = last2 + 1;
 260                 }
 261                 ip = last + 1;
 262         }
 263         return ret;
 264 }
 265
 266 /* IPv6 variants */
 267
 268 struct hash_netnet6_elem {
 269         union nf_inet_addr ip[2];
 270         u8 nomatch;
 271         u8 padding;
 272         union {
 273                 u8 cidr[2];
 274                 u16 ccmp;
 275         };
 276 };
 277
 278 /* Common functions */
 279
 280 static inline bool
 281 hash_netnet6_data_equal(const struct hash_netnet6_elem *ip1,
 282                         const struct hash_netnet6_elem *ip2,
 283                         u32 *multi)
 284 {
 285         return ipv6_addr_equal(&ip1->ip[0].in6, &ip2->ip[0].in6) &&
 286                ipv6_addr_equal(&ip1->ip[1].in6, &ip2->ip[1].in6) &&
 287                ip1->ccmp == ip2->ccmp;
 288 }
 289
 290 static inline int
 291 hash_netnet6_do_data_match(const struct hash_netnet6_elem *elem)
 292 {
 293         return elem->nomatch ? -ENOTEMPTY : 1;
 294 }
 295
 296 static inline void
 297 hash_netnet6_data_set_flags(struct hash_netnet6_elem *elem, u32 flags)
 298 {
 299         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
 300 }
 301
 302 static inline void
 303 hash_netnet6_data_reset_flags(struct hash_netnet6_elem *elem, u8 *flags)
 304 {
 305         swap(*flags, elem->nomatch);
 306 }
 307
 308 static inline void
 309 hash_netnet6_data_reset_elem(struct hash_netnet6_elem *elem,
 310                              struct hash_netnet6_elem *orig)
 311 {
 312         elem->ip[1] = orig->ip[1];
 313 }
 314
 315 static inline void
 316 hash_netnet6_data_netmask(struct hash_netnet6_elem *elem, u8 cidr, bool inner)
 317 {
 318         if (inner) {
 319                 ip6_netmask(&elem->ip[1], cidr);
 320                 elem->cidr[1] = cidr;
 321         } else {
 322                 ip6_netmask(&elem->ip[0], cidr);
 323                 elem->cidr[0] = cidr;
 324         }
 325 }
 326
 327 static bool
 328 hash_netnet6_data_list(struct sk_buff *skb,
 329                        const struct hash_netnet6_elem *data)
 330 {
 331         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 332
 333         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip[0].in6) ||
 334             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip[1].in6) ||
 335             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
 336             nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
 337             (flags &&
 338              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 339                 goto nla_put_failure;
 340         return false;
 341
 342 nla_put_failure:
 343         return true;
 344 }
 345
 346 static inline void
 347 hash_netnet6_data_next(struct hash_netnet4_elem *next,
 348                        const struct hash_netnet6_elem *d)
 349 {
 350 }
 351
 352 #undef MTYPE
 353 #undef HOST_MASK
 354
 355 #define MTYPE           hash_netnet6
 356 #define HOST_MASK       128
 357 #define IP_SET_EMIT_CREATE
 358 #include "ip_set_hash_gen.h"
 359
 360 static int
 361 hash_netnet6_kadt(struct ip_set *set, const struct sk_buff *skb,
 362                   const struct xt_action_param *par,
 363                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
 364 {
 365         const struct hash_netnet *h = set->data;
 366         ipset_adtfn adtfn = set->variant->adt[adt];
 367         struct hash_netnet6_elem e = { };
 368         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 369
 370         e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
 371         e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
 372         if (adt == IPSET_TEST)
 373                 e.ccmp = (HOST_MASK << (sizeof(u8) * 8)) | HOST_MASK;
 374
 375         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0].in6);
 376         ip6addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1].in6);
 377         ip6_netmask(&e.ip[0], e.cidr[0]);
 378         ip6_netmask(&e.ip[1], e.cidr[1]);
 379
 380         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 381 }
 382
 383 static int
 384 hash_netnet6_uadt(struct ip_set *set, struct nlattr *tb[],
 385                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 386 {
 387         ipset_adtfn adtfn = set->variant->adt[adt];
 388         struct hash_netnet6_elem e = { .cidr = { HOST_MASK, HOST_MASK, }, };
 389         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 390         int ret;
 391
 392         if (tb[IPSET_ATTR_LINENO])
 393                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 394
 395         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 396                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 397                 return -IPSET_ERR_PROTOCOL;
 398         if (unlikely(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_IP2_TO]))
 399                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 400
 401         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip[0]);
 402         if (ret)
 403                 return ret;
 404
 405         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip[1]);
 406         if (ret)
 407                 return ret;
 408
 409         ret = ip_set_get_extensions(set, tb, &ext);
 410         if (ret)
 411                 return ret;
 412
 413         if (tb[IPSET_ATTR_CIDR]) {
 414                 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 415                 if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
 416                         return -IPSET_ERR_INVALID_CIDR;
 417         }
 418
 419         if (tb[IPSET_ATTR_CIDR2]) {
 420                 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
 421                 if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
 422                         return -IPSET_ERR_INVALID_CIDR;
 423         }
 424
 425         ip6_netmask(&e.ip[0], e.cidr[0]);
 426         ip6_netmask(&e.ip[1], e.cidr[1]);
 427
 428         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 429                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 430
 431                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 432                         flags |= (IPSET_FLAG_NOMATCH << 16);
 433         }
 434
 435         ret = adtfn(set, &e, &ext, &ext, flags);
 436
 437         return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 438                ip_set_eexist(ret, flags) ? 0 : ret;
 439 }
 440
 441 static struct ip_set_type hash_netnet_type __read_mostly = {
 442         .name           = "hash:net,net",
 443         .protocol       = IPSET_PROTOCOL,
 444         .features       = IPSET_TYPE_IP | IPSET_TYPE_IP2 | IPSET_TYPE_NOMATCH,
 445         .dimension      = IPSET_DIM_TWO,
 446         .family         = NFPROTO_UNSPEC,
 447         .revision_min   = IPSET_TYPE_REV_MIN,
 448         .revision_max   = IPSET_TYPE_REV_MAX,
 449         .create         = hash_netnet_create,
 450         .create_policy  = {
 451                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 452                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 453                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 454                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 455                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 456                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 457         },
 458         .adt_policy     = {
 459                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 460                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 461                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
 462                 [IPSET_ATTR_IP2_TO]     = { .type = NLA_NESTED },
 463                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 464                 [IPSET_ATTR_CIDR2]      = { .type = NLA_U8 },
 465                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 466                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 467                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 468                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 469                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 470                                             .len  = IPSET_MAX_COMMENT_SIZE },
 471                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 472                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 473                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 474         },
 475         .me             = THIS_MODULE,
 476 };
 477
 478 static int __init
 479 hash_netnet_init(void)
 480 {
 481         return ip_set_type_register(&hash_netnet_type);
 482 }
 483
 484 static void __exit
 485 hash_netnet_fini(void)
 486 {
 487         rcu_barrier();
 488         ip_set_type_unregister(&hash_netnet_type);
 489 }
 490
 491 module_init(hash_netnet_init);
 492 module_exit(hash_netnet_fini);