1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> 3 * Copyright (C) 2013 Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa> 4 */ 5 6 /* Kernel module implementing an IP set type: the hash:net type */ 7 8 #include <linux/jhash.h> 9 #include <linux/module.h> 10 #include <linux/ip.h> 11 #include <linux/skbuff.h> 12 #include <linux/errno.h> 13 #include <linux/random.h> 14 #include <net/ip.h> 15 #include <net/ipv6.h> 16 #include <net/netlink.h> 17 18 #include <linux/netfilter.h> 19 #include <linux/netfilter/ipset/pfxlen.h> 20 #include <linux/netfilter/ipset/ip_set.h> 21 #include <linux/netfilter/ipset/ip_set_hash.h> 22 23 #define IPSET_TYPE_REV_MIN 0 24 /* 1 Forceadd support added */ 25 /* 2 skbinfo support added */ 26 #define IPSET_TYPE_REV_MAX 3 /* bucketsize, initval support added */ 27 28 MODULE_LICENSE("GPL"); 29 MODULE_AUTHOR("Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>"); 30 IP_SET_MODULE_DESC("hash:net,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 31 MODULE_ALIAS("ip_set_hash:net,net"); 32 33 /* Type specific function prefix */ 34 #define HTYPE hash_netnet 35 #define IP_SET_HASH_WITH_NETS 36 #define IPSET_NET_COUNT 2 37 38 /* IPv4 variants */ 39 40 /* Member elements */ 41 struct hash_netnet4_elem { 42 union { 43 __be32 ip[2]; 44 __be64 ipcmp; 45 }; 46 u8 nomatch; 47 u8 padding; 48 union { 49 u8 cidr[2]; 50 u16 ccmp; 51 }; 52 }; 53 54 /* Common functions */ 55 56 static bool 57 hash_netnet4_data_equal(const struct hash_netnet4_elem *ip1, 58 const struct hash_netnet4_elem *ip2, 59 u32 *multi) 60 { 61 return ip1->ipcmp == ip2->ipcmp && 62 ip1->ccmp == ip2->ccmp; 63 } 64 65 static int 66 hash_netnet4_do_data_match(const struct hash_netnet4_elem *elem) 67 { 68 return elem->nomatch ? -ENOTEMPTY : 1; 69 } 70 71 static void 72 hash_netnet4_data_set_flags(struct hash_netnet4_elem *elem, u32 flags) 73 { 74 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 75 } 76 77 static void 78 hash_netnet4_data_reset_flags(struct hash_netnet4_elem *elem, u8 *flags) 79 { 80 swap(*flags, elem->nomatch); 81 } 82 83 static void 84 hash_netnet4_data_reset_elem(struct hash_netnet4_elem *elem, 85 struct hash_netnet4_elem *orig) 86 { 87 elem->ip[1] = orig->ip[1]; 88 } 89 90 static void 91 hash_netnet4_data_netmask(struct hash_netnet4_elem *elem, u8 cidr, bool inner) 92 { 93 if (inner) { 94 elem->ip[1] &= ip_set_netmask(cidr); 95 elem->cidr[1] = cidr; 96 } else { 97 elem->ip[0] &= ip_set_netmask(cidr); 98 elem->cidr[0] = cidr; 99 } 100 } 101 102 static bool 103 hash_netnet4_data_list(struct sk_buff *skb, 104 const struct hash_netnet4_elem *data) 105 { 106 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 107 108 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip[0]) || 109 nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip[1]) || 110 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) || 111 nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) || 112 (flags && 113 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 114 goto nla_put_failure; 115 return false; 116 117 nla_put_failure: 118 return true; 119 } 120 121 static void 122 hash_netnet4_data_next(struct hash_netnet4_elem *next, 123 const struct hash_netnet4_elem *d) 124 { 125 next->ipcmp = d->ipcmp; 126 } 127 128 #define MTYPE hash_netnet4 129 #define HOST_MASK 32 130 #include "ip_set_hash_gen.h" 131 132 static void 133 hash_netnet4_init(struct hash_netnet4_elem *e) 134 { 135 e->cidr[0] = HOST_MASK; 136 e->cidr[1] = HOST_MASK; 137 } 138 139 static int 140 hash_netnet4_kadt(struct ip_set *set, const struct sk_buff *skb, 141 const struct xt_action_param *par, 142 enum ipset_adt adt, struct ip_set_adt_opt *opt) 143 { 144 const struct hash_netnet4 *h = set->data; 145 ipset_adtfn adtfn = set->variant->adt[adt]; 146 struct hash_netnet4_elem e = { }; 147 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 148 149 e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK); 150 e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK); 151 if (adt == IPSET_TEST) 152 e.ccmp = (HOST_MASK << (sizeof(e.cidr[0]) * 8)) | HOST_MASK; 153 154 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0]); 155 ip4addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1]); 156 e.ip[0] &= ip_set_netmask(e.cidr[0]); 157 e.ip[1] &= ip_set_netmask(e.cidr[1]); 158 159 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 160 } 161 162 static int 163 hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[], 164 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 165 { 166 const struct hash_netnet4 *h = set->data; 167 ipset_adtfn adtfn = set->variant->adt[adt]; 168 struct hash_netnet4_elem e = { }; 169 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 170 u32 ip = 0, ip_to = 0; 171 u32 ip2 = 0, ip2_from = 0, ip2_to = 0, ipn; 172 u64 n = 0, m = 0; 173 int ret; 174 175 if (tb[IPSET_ATTR_LINENO]) 176 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 177 178 hash_netnet4_init(&e); 179 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 180 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 181 return -IPSET_ERR_PROTOCOL; 182 183 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 184 if (ret) 185 return ret; 186 187 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from); 188 if (ret) 189 return ret; 190 191 ret = ip_set_get_extensions(set, tb, &ext); 192 if (ret) 193 return ret; 194 195 if (tb[IPSET_ATTR_CIDR]) { 196 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]); 197 if (!e.cidr[0] || e.cidr[0] > HOST_MASK) 198 return -IPSET_ERR_INVALID_CIDR; 199 } 200 201 if (tb[IPSET_ATTR_CIDR2]) { 202 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]); 203 if (!e.cidr[1] || e.cidr[1] > HOST_MASK) 204 return -IPSET_ERR_INVALID_CIDR; 205 } 206 207 if (tb[IPSET_ATTR_CADT_FLAGS]) { 208 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 209 210 if (cadt_flags & IPSET_FLAG_NOMATCH) 211 flags |= (IPSET_FLAG_NOMATCH << 16); 212 } 213 214 if (adt == IPSET_TEST || !(tb[IPSET_ATTR_IP_TO] || 215 tb[IPSET_ATTR_IP2_TO])) { 216 e.ip[0] = htonl(ip & ip_set_hostmask(e.cidr[0])); 217 e.ip[1] = htonl(ip2_from & ip_set_hostmask(e.cidr[1])); 218 ret = adtfn(set, &e, &ext, &ext, flags); 219 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 220 ip_set_eexist(ret, flags) ? 0 : ret; 221 } 222 223 ip_to = ip; 224 if (tb[IPSET_ATTR_IP_TO]) { 225 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 226 if (ret) 227 return ret; 228 if (ip_to < ip) 229 swap(ip, ip_to); 230 if (unlikely(ip + UINT_MAX == ip_to)) 231 return -IPSET_ERR_HASH_RANGE; 232 } else { 233 ip_set_mask_from_to(ip, ip_to, e.cidr[0]); 234 } 235 236 ip2_to = ip2_from; 237 if (tb[IPSET_ATTR_IP2_TO]) { 238 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to); 239 if (ret) 240 return ret; 241 if (ip2_to < ip2_from) 242 swap(ip2_from, ip2_to); 243 if (unlikely(ip2_from + UINT_MAX == ip2_to)) 244 return -IPSET_ERR_HASH_RANGE; 245 } else { 246 ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]); 247 } 248 ipn = ip; 249 do { 250 ipn = ip_set_range_to_cidr(ipn, ip_to, &e.cidr[0]); 251 n++; 252 } while (ipn++ < ip_to); 253 ipn = ip2_from; 254 do { 255 ipn = ip_set_range_to_cidr(ipn, ip2_to, &e.cidr[1]); 256 m++; 257 } while (ipn++ < ip2_to); 258 259 if (n*m > IPSET_MAX_RANGE) 260 return -ERANGE; 261 262 if (retried) { 263 ip = ntohl(h->next.ip[0]); 264 ip2 = ntohl(h->next.ip[1]); 265 } else { 266 ip2 = ip2_from; 267 } 268 269 do { 270 e.ip[0] = htonl(ip); 271 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr[0]); 272 do { 273 e.ip[1] = htonl(ip2); 274 ip2 = ip_set_range_to_cidr(ip2, ip2_to, &e.cidr[1]); 275 ret = adtfn(set, &e, &ext, &ext, flags); 276 if (ret && !ip_set_eexist(ret, flags)) 277 return ret; 278 279 ret = 0; 280 } while (ip2++ < ip2_to); 281 ip2 = ip2_from; 282 } while (ip++ < ip_to); 283 return ret; 284 } 285 286 /* IPv6 variants */ 287 288 struct hash_netnet6_elem { 289 union nf_inet_addr ip[2]; 290 u8 nomatch; 291 u8 padding; 292 union { 293 u8 cidr[2]; 294 u16 ccmp; 295 }; 296 }; 297 298 /* Common functions */ 299 300 static bool 301 hash_netnet6_data_equal(const struct hash_netnet6_elem *ip1, 302 const struct hash_netnet6_elem *ip2, 303 u32 *multi) 304 { 305 return ipv6_addr_equal(&ip1->ip[0].in6, &ip2->ip[0].in6) && 306 ipv6_addr_equal(&ip1->ip[1].in6, &ip2->ip[1].in6) && 307 ip1->ccmp == ip2->ccmp; 308 } 309 310 static int 311 hash_netnet6_do_data_match(const struct hash_netnet6_elem *elem) 312 { 313 return elem->nomatch ? -ENOTEMPTY : 1; 314 } 315 316 static void 317 hash_netnet6_data_set_flags(struct hash_netnet6_elem *elem, u32 flags) 318 { 319 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 320 } 321 322 static void 323 hash_netnet6_data_reset_flags(struct hash_netnet6_elem *elem, u8 *flags) 324 { 325 swap(*flags, elem->nomatch); 326 } 327 328 static void 329 hash_netnet6_data_reset_elem(struct hash_netnet6_elem *elem, 330 struct hash_netnet6_elem *orig) 331 { 332 elem->ip[1] = orig->ip[1]; 333 } 334 335 static void 336 hash_netnet6_data_netmask(struct hash_netnet6_elem *elem, u8 cidr, bool inner) 337 { 338 if (inner) { 339 ip6_netmask(&elem->ip[1], cidr); 340 elem->cidr[1] = cidr; 341 } else { 342 ip6_netmask(&elem->ip[0], cidr); 343 elem->cidr[0] = cidr; 344 } 345 } 346 347 static bool 348 hash_netnet6_data_list(struct sk_buff *skb, 349 const struct hash_netnet6_elem *data) 350 { 351 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 352 353 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip[0].in6) || 354 nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip[1].in6) || 355 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) || 356 nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) || 357 (flags && 358 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 359 goto nla_put_failure; 360 return false; 361 362 nla_put_failure: 363 return true; 364 } 365 366 static void 367 hash_netnet6_data_next(struct hash_netnet6_elem *next, 368 const struct hash_netnet6_elem *d) 369 { 370 } 371 372 #undef MTYPE 373 #undef HOST_MASK 374 375 #define MTYPE hash_netnet6 376 #define HOST_MASK 128 377 #define IP_SET_EMIT_CREATE 378 #include "ip_set_hash_gen.h" 379 380 static void 381 hash_netnet6_init(struct hash_netnet6_elem *e) 382 { 383 e->cidr[0] = HOST_MASK; 384 e->cidr[1] = HOST_MASK; 385 } 386 387 static int 388 hash_netnet6_kadt(struct ip_set *set, const struct sk_buff *skb, 389 const struct xt_action_param *par, 390 enum ipset_adt adt, struct ip_set_adt_opt *opt) 391 { 392 const struct hash_netnet6 *h = set->data; 393 ipset_adtfn adtfn = set->variant->adt[adt]; 394 struct hash_netnet6_elem e = { }; 395 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 396 397 e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK); 398 e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK); 399 if (adt == IPSET_TEST) 400 e.ccmp = (HOST_MASK << (sizeof(u8) * 8)) | HOST_MASK; 401 402 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0].in6); 403 ip6addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1].in6); 404 ip6_netmask(&e.ip[0], e.cidr[0]); 405 ip6_netmask(&e.ip[1], e.cidr[1]); 406 407 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 408 } 409 410 static int 411 hash_netnet6_uadt(struct ip_set *set, struct nlattr *tb[], 412 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 413 { 414 ipset_adtfn adtfn = set->variant->adt[adt]; 415 struct hash_netnet6_elem e = { }; 416 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 417 int ret; 418 419 if (tb[IPSET_ATTR_LINENO]) 420 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 421 422 hash_netnet6_init(&e); 423 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 424 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 425 return -IPSET_ERR_PROTOCOL; 426 if (unlikely(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_IP2_TO])) 427 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 428 429 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip[0]); 430 if (ret) 431 return ret; 432 433 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip[1]); 434 if (ret) 435 return ret; 436 437 ret = ip_set_get_extensions(set, tb, &ext); 438 if (ret) 439 return ret; 440 441 if (tb[IPSET_ATTR_CIDR]) { 442 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]); 443 if (!e.cidr[0] || e.cidr[0] > HOST_MASK) 444 return -IPSET_ERR_INVALID_CIDR; 445 } 446 447 if (tb[IPSET_ATTR_CIDR2]) { 448 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]); 449 if (!e.cidr[1] || e.cidr[1] > HOST_MASK) 450 return -IPSET_ERR_INVALID_CIDR; 451 } 452 453 ip6_netmask(&e.ip[0], e.cidr[0]); 454 ip6_netmask(&e.ip[1], e.cidr[1]); 455 456 if (tb[IPSET_ATTR_CADT_FLAGS]) { 457 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 458 459 if (cadt_flags & IPSET_FLAG_NOMATCH) 460 flags |= (IPSET_FLAG_NOMATCH << 16); 461 } 462 463 ret = adtfn(set, &e, &ext, &ext, flags); 464 465 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 466 ip_set_eexist(ret, flags) ? 0 : ret; 467 } 468 469 static struct ip_set_type hash_netnet_type __read_mostly = { 470 .name = "hash:net,net", 471 .protocol = IPSET_PROTOCOL, 472 .features = IPSET_TYPE_IP | IPSET_TYPE_IP2 | IPSET_TYPE_NOMATCH, 473 .dimension = IPSET_DIM_TWO, 474 .family = NFPROTO_UNSPEC, 475 .revision_min = IPSET_TYPE_REV_MIN, 476 .revision_max = IPSET_TYPE_REV_MAX, 477 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 478 .create = hash_netnet_create, 479 .create_policy = { 480 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 481 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 482 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 483 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 484 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 485 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 486 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 487 }, 488 .adt_policy = { 489 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 490 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 491 [IPSET_ATTR_IP2] = { .type = NLA_NESTED }, 492 [IPSET_ATTR_IP2_TO] = { .type = NLA_NESTED }, 493 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 494 [IPSET_ATTR_CIDR2] = { .type = NLA_U8 }, 495 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 496 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 497 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 498 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 499 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 500 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 501 .len = IPSET_MAX_COMMENT_SIZE }, 502 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 503 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 504 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 505 }, 506 .me = THIS_MODULE, 507 }; 508 509 static int __init 510 hash_netnet_init(void) 511 { 512 return ip_set_type_register(&hash_netnet_type); 513 } 514 515 static void __exit 516 hash_netnet_fini(void) 517 { 518 rcu_barrier(); 519 ip_set_type_unregister(&hash_netnet_type); 520 } 521 522 module_init(hash_netnet_init); 523 module_exit(hash_netnet_fini); 524