1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */ 3 4 /* Kernel module implementing an IP set type: the hash:ip,port,net type */ 5 6 #include <linux/jhash.h> 7 #include <linux/module.h> 8 #include <linux/ip.h> 9 #include <linux/skbuff.h> 10 #include <linux/errno.h> 11 #include <linux/random.h> 12 #include <net/ip.h> 13 #include <net/ipv6.h> 14 #include <net/netlink.h> 15 #include <net/tcp.h> 16 17 #include <linux/netfilter.h> 18 #include <linux/netfilter/ipset/pfxlen.h> 19 #include <linux/netfilter/ipset/ip_set.h> 20 #include <linux/netfilter/ipset/ip_set_getport.h> 21 #include <linux/netfilter/ipset/ip_set_hash.h> 22 23 #define IPSET_TYPE_REV_MIN 0 24 /* 1 SCTP and UDPLITE support added */ 25 /* 2 Range as input support for IPv4 added */ 26 /* 3 nomatch flag support added */ 27 /* 4 Counters support added */ 28 /* 5 Comments support added */ 29 /* 6 Forceadd support added */ 30 #define IPSET_TYPE_REV_MAX 7 /* skbinfo support added */ 31 32 MODULE_LICENSE("GPL"); 33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 34 IP_SET_MODULE_DESC("hash:ip,port,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 35 MODULE_ALIAS("ip_set_hash:ip,port,net"); 36 37 /* Type specific function prefix */ 38 #define HTYPE hash_ipportnet 39 40 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0 41 * However this way we have to store internally cidr - 1, 42 * dancing back and forth. 43 */ 44 #define IP_SET_HASH_WITH_NETS_PACKED 45 #define IP_SET_HASH_WITH_PROTO 46 #define IP_SET_HASH_WITH_NETS 47 48 /* IPv4 variant */ 49 50 /* Member elements */ 51 struct hash_ipportnet4_elem { 52 __be32 ip; 53 __be32 ip2; 54 __be16 port; 55 u8 cidr:7; 56 u8 nomatch:1; 57 u8 proto; 58 }; 59 60 /* Common functions */ 61 62 static bool 63 hash_ipportnet4_data_equal(const struct hash_ipportnet4_elem *ip1, 64 const struct hash_ipportnet4_elem *ip2, 65 u32 *multi) 66 { 67 return ip1->ip == ip2->ip && 68 ip1->ip2 == ip2->ip2 && 69 ip1->cidr == ip2->cidr && 70 ip1->port == ip2->port && 71 ip1->proto == ip2->proto; 72 } 73 74 static int 75 hash_ipportnet4_do_data_match(const struct hash_ipportnet4_elem *elem) 76 { 77 return elem->nomatch ? -ENOTEMPTY : 1; 78 } 79 80 static void 81 hash_ipportnet4_data_set_flags(struct hash_ipportnet4_elem *elem, u32 flags) 82 { 83 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH); 84 } 85 86 static void 87 hash_ipportnet4_data_reset_flags(struct hash_ipportnet4_elem *elem, u8 *flags) 88 { 89 swap(*flags, elem->nomatch); 90 } 91 92 static void 93 hash_ipportnet4_data_netmask(struct hash_ipportnet4_elem *elem, u8 cidr) 94 { 95 elem->ip2 &= ip_set_netmask(cidr); 96 elem->cidr = cidr - 1; 97 } 98 99 static bool 100 hash_ipportnet4_data_list(struct sk_buff *skb, 101 const struct hash_ipportnet4_elem *data) 102 { 103 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 104 105 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 106 nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) || 107 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 108 nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr + 1) || 109 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) || 110 (flags && 111 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 112 goto nla_put_failure; 113 return false; 114 115 nla_put_failure: 116 return true; 117 } 118 119 static void 120 hash_ipportnet4_data_next(struct hash_ipportnet4_elem *next, 121 const struct hash_ipportnet4_elem *d) 122 { 123 next->ip = d->ip; 124 next->port = d->port; 125 next->ip2 = d->ip2; 126 } 127 128 #define MTYPE hash_ipportnet4 129 #define HOST_MASK 32 130 #include "ip_set_hash_gen.h" 131 132 static int 133 hash_ipportnet4_kadt(struct ip_set *set, const struct sk_buff *skb, 134 const struct xt_action_param *par, 135 enum ipset_adt adt, struct ip_set_adt_opt *opt) 136 { 137 const struct hash_ipportnet4 *h = set->data; 138 ipset_adtfn adtfn = set->variant->adt[adt]; 139 struct hash_ipportnet4_elem e = { 140 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 141 }; 142 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 143 144 if (adt == IPSET_TEST) 145 e.cidr = HOST_MASK - 1; 146 147 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 148 &e.port, &e.proto)) 149 return -EINVAL; 150 151 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 152 ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2); 153 e.ip2 &= ip_set_netmask(e.cidr + 1); 154 155 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 156 } 157 158 static int 159 hash_ipportnet4_uadt(struct ip_set *set, struct nlattr *tb[], 160 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 161 { 162 const struct hash_ipportnet4 *h = set->data; 163 ipset_adtfn adtfn = set->variant->adt[adt]; 164 struct hash_ipportnet4_elem e = { .cidr = HOST_MASK - 1 }; 165 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 166 u32 ip = 0, ip_to = 0, p = 0, port, port_to; 167 u32 ip2_from = 0, ip2_to = 0, ip2; 168 bool with_ports = false; 169 u8 cidr; 170 int ret; 171 172 if (tb[IPSET_ATTR_LINENO]) 173 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 174 175 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 176 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 177 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || 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_extensions(set, tb, &ext); 186 if (ret) 187 return ret; 188 189 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from); 190 if (ret) 191 return ret; 192 193 if (tb[IPSET_ATTR_CIDR2]) { 194 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR2]); 195 if (!cidr || cidr > HOST_MASK) 196 return -IPSET_ERR_INVALID_CIDR; 197 e.cidr = cidr - 1; 198 } 199 200 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 201 202 if (tb[IPSET_ATTR_PROTO]) { 203 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 204 with_ports = ip_set_proto_with_ports(e.proto); 205 206 if (e.proto == 0) 207 return -IPSET_ERR_INVALID_PROTO; 208 } else { 209 return -IPSET_ERR_MISSING_PROTO; 210 } 211 212 if (!(with_ports || e.proto == IPPROTO_ICMP)) 213 e.port = 0; 214 215 if (tb[IPSET_ATTR_CADT_FLAGS]) { 216 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 217 218 if (cadt_flags & IPSET_FLAG_NOMATCH) 219 flags |= (IPSET_FLAG_NOMATCH << 16); 220 } 221 222 with_ports = with_ports && tb[IPSET_ATTR_PORT_TO]; 223 if (adt == IPSET_TEST || 224 !(tb[IPSET_ATTR_CIDR] || tb[IPSET_ATTR_IP_TO] || with_ports || 225 tb[IPSET_ATTR_IP2_TO])) { 226 e.ip = htonl(ip); 227 e.ip2 = htonl(ip2_from & ip_set_hostmask(e.cidr + 1)); 228 ret = adtfn(set, &e, &ext, &ext, flags); 229 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 230 ip_set_eexist(ret, flags) ? 0 : ret; 231 } 232 233 ip_to = ip; 234 if (tb[IPSET_ATTR_IP_TO]) { 235 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 236 if (ret) 237 return ret; 238 if (ip > ip_to) 239 swap(ip, ip_to); 240 } else if (tb[IPSET_ATTR_CIDR]) { 241 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 242 243 if (!cidr || cidr > HOST_MASK) 244 return -IPSET_ERR_INVALID_CIDR; 245 ip_set_mask_from_to(ip, ip_to, cidr); 246 } 247 248 port_to = port = ntohs(e.port); 249 if (tb[IPSET_ATTR_PORT_TO]) { 250 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 251 if (port > port_to) 252 swap(port, port_to); 253 } 254 255 ip2_to = ip2_from; 256 if (tb[IPSET_ATTR_IP2_TO]) { 257 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to); 258 if (ret) 259 return ret; 260 if (ip2_from > ip2_to) 261 swap(ip2_from, ip2_to); 262 if (ip2_from + UINT_MAX == ip2_to) 263 return -IPSET_ERR_HASH_RANGE; 264 } else { 265 ip_set_mask_from_to(ip2_from, ip2_to, e.cidr + 1); 266 } 267 268 if (retried) { 269 ip = ntohl(h->next.ip); 270 p = ntohs(h->next.port); 271 ip2 = ntohl(h->next.ip2); 272 } else { 273 p = port; 274 ip2 = ip2_from; 275 } 276 for (; ip <= ip_to; ip++) { 277 e.ip = htonl(ip); 278 for (; p <= port_to; p++) { 279 e.port = htons(p); 280 do { 281 e.ip2 = htonl(ip2); 282 ip2 = ip_set_range_to_cidr(ip2, ip2_to, &cidr); 283 e.cidr = cidr - 1; 284 ret = adtfn(set, &e, &ext, &ext, flags); 285 286 if (ret && !ip_set_eexist(ret, flags)) 287 return ret; 288 289 ret = 0; 290 } while (ip2++ < ip2_to); 291 ip2 = ip2_from; 292 } 293 p = port; 294 } 295 return ret; 296 } 297 298 /* IPv6 variant */ 299 300 struct hash_ipportnet6_elem { 301 union nf_inet_addr ip; 302 union nf_inet_addr ip2; 303 __be16 port; 304 u8 cidr:7; 305 u8 nomatch:1; 306 u8 proto; 307 }; 308 309 /* Common functions */ 310 311 static bool 312 hash_ipportnet6_data_equal(const struct hash_ipportnet6_elem *ip1, 313 const struct hash_ipportnet6_elem *ip2, 314 u32 *multi) 315 { 316 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 317 ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) && 318 ip1->cidr == ip2->cidr && 319 ip1->port == ip2->port && 320 ip1->proto == ip2->proto; 321 } 322 323 static int 324 hash_ipportnet6_do_data_match(const struct hash_ipportnet6_elem *elem) 325 { 326 return elem->nomatch ? -ENOTEMPTY : 1; 327 } 328 329 static void 330 hash_ipportnet6_data_set_flags(struct hash_ipportnet6_elem *elem, u32 flags) 331 { 332 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH); 333 } 334 335 static void 336 hash_ipportnet6_data_reset_flags(struct hash_ipportnet6_elem *elem, u8 *flags) 337 { 338 swap(*flags, elem->nomatch); 339 } 340 341 static void 342 hash_ipportnet6_data_netmask(struct hash_ipportnet6_elem *elem, u8 cidr) 343 { 344 ip6_netmask(&elem->ip2, cidr); 345 elem->cidr = cidr - 1; 346 } 347 348 static bool 349 hash_ipportnet6_data_list(struct sk_buff *skb, 350 const struct hash_ipportnet6_elem *data) 351 { 352 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 353 354 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 355 nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) || 356 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 357 nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr + 1) || 358 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) || 359 (flags && 360 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 361 goto nla_put_failure; 362 return false; 363 364 nla_put_failure: 365 return true; 366 } 367 368 static void 369 hash_ipportnet6_data_next(struct hash_ipportnet6_elem *next, 370 const struct hash_ipportnet6_elem *d) 371 { 372 next->port = d->port; 373 } 374 375 #undef MTYPE 376 #undef HOST_MASK 377 378 #define MTYPE hash_ipportnet6 379 #define HOST_MASK 128 380 #define IP_SET_EMIT_CREATE 381 #include "ip_set_hash_gen.h" 382 383 static int 384 hash_ipportnet6_kadt(struct ip_set *set, const struct sk_buff *skb, 385 const struct xt_action_param *par, 386 enum ipset_adt adt, struct ip_set_adt_opt *opt) 387 { 388 const struct hash_ipportnet6 *h = set->data; 389 ipset_adtfn adtfn = set->variant->adt[adt]; 390 struct hash_ipportnet6_elem e = { 391 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 392 }; 393 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 394 395 if (adt == IPSET_TEST) 396 e.cidr = HOST_MASK - 1; 397 398 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 399 &e.port, &e.proto)) 400 return -EINVAL; 401 402 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 403 ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6); 404 ip6_netmask(&e.ip2, e.cidr + 1); 405 406 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 407 } 408 409 static int 410 hash_ipportnet6_uadt(struct ip_set *set, struct nlattr *tb[], 411 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 412 { 413 const struct hash_ipportnet6 *h = set->data; 414 ipset_adtfn adtfn = set->variant->adt[adt]; 415 struct hash_ipportnet6_elem e = { .cidr = HOST_MASK - 1 }; 416 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 417 u32 port, port_to; 418 bool with_ports = false; 419 u8 cidr; 420 int ret; 421 422 if (tb[IPSET_ATTR_LINENO]) 423 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 424 425 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 426 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 427 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || 428 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 429 return -IPSET_ERR_PROTOCOL; 430 if (unlikely(tb[IPSET_ATTR_IP_TO])) 431 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 432 if (unlikely(tb[IPSET_ATTR_CIDR])) { 433 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 434 435 if (cidr != HOST_MASK) 436 return -IPSET_ERR_INVALID_CIDR; 437 } 438 439 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 440 if (ret) 441 return ret; 442 443 ret = ip_set_get_extensions(set, tb, &ext); 444 if (ret) 445 return ret; 446 447 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2); 448 if (ret) 449 return ret; 450 451 if (tb[IPSET_ATTR_CIDR2]) { 452 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR2]); 453 if (!cidr || cidr > HOST_MASK) 454 return -IPSET_ERR_INVALID_CIDR; 455 e.cidr = cidr - 1; 456 } 457 458 ip6_netmask(&e.ip2, e.cidr + 1); 459 460 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 461 462 if (tb[IPSET_ATTR_PROTO]) { 463 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 464 with_ports = ip_set_proto_with_ports(e.proto); 465 466 if (e.proto == 0) 467 return -IPSET_ERR_INVALID_PROTO; 468 } else { 469 return -IPSET_ERR_MISSING_PROTO; 470 } 471 472 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 473 e.port = 0; 474 475 if (tb[IPSET_ATTR_CADT_FLAGS]) { 476 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 477 478 if (cadt_flags & IPSET_FLAG_NOMATCH) 479 flags |= (IPSET_FLAG_NOMATCH << 16); 480 } 481 482 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 483 ret = adtfn(set, &e, &ext, &ext, flags); 484 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 485 ip_set_eexist(ret, flags) ? 0 : ret; 486 } 487 488 port = ntohs(e.port); 489 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 490 if (port > port_to) 491 swap(port, port_to); 492 493 if (retried) 494 port = ntohs(h->next.port); 495 for (; port <= port_to; port++) { 496 e.port = htons(port); 497 ret = adtfn(set, &e, &ext, &ext, flags); 498 499 if (ret && !ip_set_eexist(ret, flags)) 500 return ret; 501 502 ret = 0; 503 } 504 return ret; 505 } 506 507 static struct ip_set_type hash_ipportnet_type __read_mostly = { 508 .name = "hash:ip,port,net", 509 .protocol = IPSET_PROTOCOL, 510 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2 | 511 IPSET_TYPE_NOMATCH, 512 .dimension = IPSET_DIM_THREE, 513 .family = NFPROTO_UNSPEC, 514 .revision_min = IPSET_TYPE_REV_MIN, 515 .revision_max = IPSET_TYPE_REV_MAX, 516 .create = hash_ipportnet_create, 517 .create_policy = { 518 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 519 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 520 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 521 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 522 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 523 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 524 }, 525 .adt_policy = { 526 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 527 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 528 [IPSET_ATTR_IP2] = { .type = NLA_NESTED }, 529 [IPSET_ATTR_IP2_TO] = { .type = NLA_NESTED }, 530 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 531 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 532 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 533 [IPSET_ATTR_CIDR2] = { .type = NLA_U8 }, 534 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 535 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 536 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 537 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 538 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 539 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 540 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 541 .len = IPSET_MAX_COMMENT_SIZE }, 542 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 543 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 544 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 545 }, 546 .me = THIS_MODULE, 547 }; 548 549 static int __init 550 hash_ipportnet_init(void) 551 { 552 return ip_set_type_register(&hash_ipportnet_type); 553 } 554 555 static void __exit 556 hash_ipportnet_fini(void) 557 { 558 rcu_barrier(); 559 ip_set_type_unregister(&hash_ipportnet_type); 560 } 561 562 module_init(hash_ipportnet_init); 563 module_exit(hash_ipportnet_fini); 564