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