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; 172 int ret; 173 174 if (tb[IPSET_ATTR_LINENO]) 175 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 176 177 hash_netnet4_init(&e); 178 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 179 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 180 return -IPSET_ERR_PROTOCOL; 181 182 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 183 if (ret) 184 return ret; 185 186 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from); 187 if (ret) 188 return ret; 189 190 ret = ip_set_get_extensions(set, tb, &ext); 191 if (ret) 192 return ret; 193 194 if (tb[IPSET_ATTR_CIDR]) { 195 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]); 196 if (!e.cidr[0] || e.cidr[0] > HOST_MASK) 197 return -IPSET_ERR_INVALID_CIDR; 198 } 199 200 if (tb[IPSET_ATTR_CIDR2]) { 201 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]); 202 if (!e.cidr[1] || e.cidr[1] > HOST_MASK) 203 return -IPSET_ERR_INVALID_CIDR; 204 } 205 206 if (tb[IPSET_ATTR_CADT_FLAGS]) { 207 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 208 209 if (cadt_flags & IPSET_FLAG_NOMATCH) 210 flags |= (IPSET_FLAG_NOMATCH << 16); 211 } 212 213 if (adt == IPSET_TEST || !(tb[IPSET_ATTR_IP_TO] || 214 tb[IPSET_ATTR_IP2_TO])) { 215 e.ip[0] = htonl(ip & ip_set_hostmask(e.cidr[0])); 216 e.ip[1] = htonl(ip2_from & ip_set_hostmask(e.cidr[1])); 217 ret = adtfn(set, &e, &ext, &ext, flags); 218 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 219 ip_set_eexist(ret, flags) ? 0 : ret; 220 } 221 222 ip_to = ip; 223 if (tb[IPSET_ATTR_IP_TO]) { 224 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 225 if (ret) 226 return ret; 227 if (ip_to < ip) 228 swap(ip, ip_to); 229 if (unlikely(ip + UINT_MAX == ip_to)) 230 return -IPSET_ERR_HASH_RANGE; 231 } else { 232 ip_set_mask_from_to(ip, ip_to, e.cidr[0]); 233 } 234 235 ip2_to = ip2_from; 236 if (tb[IPSET_ATTR_IP2_TO]) { 237 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to); 238 if (ret) 239 return ret; 240 if (ip2_to < ip2_from) 241 swap(ip2_from, ip2_to); 242 if (unlikely(ip2_from + UINT_MAX == ip2_to)) 243 return -IPSET_ERR_HASH_RANGE; 244 } else { 245 ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]); 246 } 247 248 if (retried) { 249 ip = ntohl(h->next.ip[0]); 250 ip2 = ntohl(h->next.ip[1]); 251 } else { 252 ip2 = ip2_from; 253 } 254 255 do { 256 e.ip[0] = htonl(ip); 257 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr[0]); 258 do { 259 e.ip[1] = htonl(ip2); 260 ip2 = ip_set_range_to_cidr(ip2, ip2_to, &e.cidr[1]); 261 ret = adtfn(set, &e, &ext, &ext, flags); 262 if (ret && !ip_set_eexist(ret, flags)) 263 return ret; 264 265 ret = 0; 266 } while (ip2++ < ip2_to); 267 ip2 = ip2_from; 268 } while (ip++ < ip_to); 269 return ret; 270 } 271 272 /* IPv6 variants */ 273 274 struct hash_netnet6_elem { 275 union nf_inet_addr ip[2]; 276 u8 nomatch; 277 u8 padding; 278 union { 279 u8 cidr[2]; 280 u16 ccmp; 281 }; 282 }; 283 284 /* Common functions */ 285 286 static bool 287 hash_netnet6_data_equal(const struct hash_netnet6_elem *ip1, 288 const struct hash_netnet6_elem *ip2, 289 u32 *multi) 290 { 291 return ipv6_addr_equal(&ip1->ip[0].in6, &ip2->ip[0].in6) && 292 ipv6_addr_equal(&ip1->ip[1].in6, &ip2->ip[1].in6) && 293 ip1->ccmp == ip2->ccmp; 294 } 295 296 static int 297 hash_netnet6_do_data_match(const struct hash_netnet6_elem *elem) 298 { 299 return elem->nomatch ? -ENOTEMPTY : 1; 300 } 301 302 static void 303 hash_netnet6_data_set_flags(struct hash_netnet6_elem *elem, u32 flags) 304 { 305 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 306 } 307 308 static void 309 hash_netnet6_data_reset_flags(struct hash_netnet6_elem *elem, u8 *flags) 310 { 311 swap(*flags, elem->nomatch); 312 } 313 314 static void 315 hash_netnet6_data_reset_elem(struct hash_netnet6_elem *elem, 316 struct hash_netnet6_elem *orig) 317 { 318 elem->ip[1] = orig->ip[1]; 319 } 320 321 static void 322 hash_netnet6_data_netmask(struct hash_netnet6_elem *elem, u8 cidr, bool inner) 323 { 324 if (inner) { 325 ip6_netmask(&elem->ip[1], cidr); 326 elem->cidr[1] = cidr; 327 } else { 328 ip6_netmask(&elem->ip[0], cidr); 329 elem->cidr[0] = cidr; 330 } 331 } 332 333 static bool 334 hash_netnet6_data_list(struct sk_buff *skb, 335 const struct hash_netnet6_elem *data) 336 { 337 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 338 339 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip[0].in6) || 340 nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip[1].in6) || 341 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) || 342 nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) || 343 (flags && 344 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 345 goto nla_put_failure; 346 return false; 347 348 nla_put_failure: 349 return true; 350 } 351 352 static void 353 hash_netnet6_data_next(struct hash_netnet6_elem *next, 354 const struct hash_netnet6_elem *d) 355 { 356 } 357 358 #undef MTYPE 359 #undef HOST_MASK 360 361 #define MTYPE hash_netnet6 362 #define HOST_MASK 128 363 #define IP_SET_EMIT_CREATE 364 #include "ip_set_hash_gen.h" 365 366 static void 367 hash_netnet6_init(struct hash_netnet6_elem *e) 368 { 369 e->cidr[0] = HOST_MASK; 370 e->cidr[1] = HOST_MASK; 371 } 372 373 static int 374 hash_netnet6_kadt(struct ip_set *set, const struct sk_buff *skb, 375 const struct xt_action_param *par, 376 enum ipset_adt adt, struct ip_set_adt_opt *opt) 377 { 378 const struct hash_netnet6 *h = set->data; 379 ipset_adtfn adtfn = set->variant->adt[adt]; 380 struct hash_netnet6_elem e = { }; 381 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 382 383 e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK); 384 e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK); 385 if (adt == IPSET_TEST) 386 e.ccmp = (HOST_MASK << (sizeof(u8) * 8)) | HOST_MASK; 387 388 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0].in6); 389 ip6addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1].in6); 390 ip6_netmask(&e.ip[0], e.cidr[0]); 391 ip6_netmask(&e.ip[1], e.cidr[1]); 392 393 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 394 } 395 396 static int 397 hash_netnet6_uadt(struct ip_set *set, struct nlattr *tb[], 398 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 399 { 400 ipset_adtfn adtfn = set->variant->adt[adt]; 401 struct hash_netnet6_elem e = { }; 402 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 403 int ret; 404 405 if (tb[IPSET_ATTR_LINENO]) 406 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 407 408 hash_netnet6_init(&e); 409 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 410 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 411 return -IPSET_ERR_PROTOCOL; 412 if (unlikely(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_IP2_TO])) 413 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 414 415 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip[0]); 416 if (ret) 417 return ret; 418 419 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip[1]); 420 if (ret) 421 return ret; 422 423 ret = ip_set_get_extensions(set, tb, &ext); 424 if (ret) 425 return ret; 426 427 if (tb[IPSET_ATTR_CIDR]) { 428 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]); 429 if (!e.cidr[0] || e.cidr[0] > HOST_MASK) 430 return -IPSET_ERR_INVALID_CIDR; 431 } 432 433 if (tb[IPSET_ATTR_CIDR2]) { 434 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]); 435 if (!e.cidr[1] || e.cidr[1] > HOST_MASK) 436 return -IPSET_ERR_INVALID_CIDR; 437 } 438 439 ip6_netmask(&e.ip[0], e.cidr[0]); 440 ip6_netmask(&e.ip[1], e.cidr[1]); 441 442 if (tb[IPSET_ATTR_CADT_FLAGS]) { 443 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 444 445 if (cadt_flags & IPSET_FLAG_NOMATCH) 446 flags |= (IPSET_FLAG_NOMATCH << 16); 447 } 448 449 ret = adtfn(set, &e, &ext, &ext, flags); 450 451 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 452 ip_set_eexist(ret, flags) ? 0 : ret; 453 } 454 455 static struct ip_set_type hash_netnet_type __read_mostly = { 456 .name = "hash:net,net", 457 .protocol = IPSET_PROTOCOL, 458 .features = IPSET_TYPE_IP | IPSET_TYPE_IP2 | IPSET_TYPE_NOMATCH, 459 .dimension = IPSET_DIM_TWO, 460 .family = NFPROTO_UNSPEC, 461 .revision_min = IPSET_TYPE_REV_MIN, 462 .revision_max = IPSET_TYPE_REV_MAX, 463 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 464 .create = hash_netnet_create, 465 .create_policy = { 466 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 467 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 468 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 469 [IPSET_ATTR_BUCKETSIZE] = { .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_LINENO] = { .type = NLA_U32 }, 483 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 484 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 485 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 486 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 487 .len = IPSET_MAX_COMMENT_SIZE }, 488 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 489 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 490 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 491 }, 492 .me = THIS_MODULE, 493 }; 494 495 static int __init 496 hash_netnet_init(void) 497 { 498 return ip_set_type_register(&hash_netnet_type); 499 } 500 501 static void __exit 502 hash_netnet_fini(void) 503 { 504 rcu_barrier(); 505 ip_set_type_unregister(&hash_netnet_type); 506 } 507 508 module_init(hash_netnet_init); 509 module_exit(hash_netnet_fini); 510