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:net,port 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 16 #include <linux/netfilter.h> 17 #include <linux/netfilter/ipset/pfxlen.h> 18 #include <linux/netfilter/ipset/ip_set.h> 19 #include <linux/netfilter/ipset/ip_set_getport.h> 20 #include <linux/netfilter/ipset/ip_set_hash.h> 21 22 #define IPSET_TYPE_REV_MIN 0 23 /* 1 SCTP and UDPLITE support added */ 24 /* 2 Range as input support for IPv4 added */ 25 /* 3 nomatch flag support added */ 26 /* 4 Counters support added */ 27 /* 5 Comments support added */ 28 /* 6 Forceadd support added */ 29 /* 7 skbinfo support added */ 30 #define IPSET_TYPE_REV_MAX 8 /* bucketsize, initval support added */ 31 32 MODULE_LICENSE("GPL"); 33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 34 IP_SET_MODULE_DESC("hash:net,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 35 MODULE_ALIAS("ip_set_hash:net,port"); 36 37 /* Type specific function prefix */ 38 #define HTYPE hash_netport 39 #define IP_SET_HASH_WITH_PROTO 40 #define IP_SET_HASH_WITH_NETS 41 42 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0 43 * However this way we have to store internally cidr - 1, 44 * dancing back and forth. 45 */ 46 #define IP_SET_HASH_WITH_NETS_PACKED 47 48 /* IPv4 variant */ 49 50 /* Member elements */ 51 struct hash_netport4_elem { 52 __be32 ip; 53 __be16 port; 54 u8 proto; 55 u8 cidr:7; 56 u8 nomatch:1; 57 }; 58 59 /* Common functions */ 60 61 static bool 62 hash_netport4_data_equal(const struct hash_netport4_elem *ip1, 63 const struct hash_netport4_elem *ip2, 64 u32 *multi) 65 { 66 return ip1->ip == ip2->ip && 67 ip1->port == ip2->port && 68 ip1->proto == ip2->proto && 69 ip1->cidr == ip2->cidr; 70 } 71 72 static int 73 hash_netport4_do_data_match(const struct hash_netport4_elem *elem) 74 { 75 return elem->nomatch ? -ENOTEMPTY : 1; 76 } 77 78 static void 79 hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags) 80 { 81 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH); 82 } 83 84 static void 85 hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags) 86 { 87 swap(*flags, elem->nomatch); 88 } 89 90 static void 91 hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr) 92 { 93 elem->ip &= ip_set_netmask(cidr); 94 elem->cidr = cidr - 1; 95 } 96 97 static bool 98 hash_netport4_data_list(struct sk_buff *skb, 99 const struct hash_netport4_elem *data) 100 { 101 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 102 103 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 104 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 105 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) || 106 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) || 107 (flags && 108 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 109 goto nla_put_failure; 110 return false; 111 112 nla_put_failure: 113 return true; 114 } 115 116 static void 117 hash_netport4_data_next(struct hash_netport4_elem *next, 118 const struct hash_netport4_elem *d) 119 { 120 next->ip = d->ip; 121 next->port = d->port; 122 } 123 124 #define MTYPE hash_netport4 125 #define HOST_MASK 32 126 #include "ip_set_hash_gen.h" 127 128 static int 129 hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb, 130 const struct xt_action_param *par, 131 enum ipset_adt adt, struct ip_set_adt_opt *opt) 132 { 133 const struct hash_netport4 *h = set->data; 134 ipset_adtfn adtfn = set->variant->adt[adt]; 135 struct hash_netport4_elem e = { 136 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 137 }; 138 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 139 140 if (adt == IPSET_TEST) 141 e.cidr = HOST_MASK - 1; 142 143 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 144 &e.port, &e.proto)) 145 return -EINVAL; 146 147 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 148 e.ip &= ip_set_netmask(e.cidr + 1); 149 150 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 151 } 152 153 static int 154 hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[], 155 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 156 { 157 const struct hash_netport4 *h = set->data; 158 ipset_adtfn adtfn = set->variant->adt[adt]; 159 struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 }; 160 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 161 u32 port, port_to, p = 0, ip = 0, ip_to = 0, ipn; 162 u64 n = 0; 163 bool with_ports = false; 164 u8 cidr; 165 int ret; 166 167 if (tb[IPSET_ATTR_LINENO]) 168 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 169 170 if (unlikely(!tb[IPSET_ATTR_IP] || 171 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 172 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || 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_extensions(set, tb, &ext); 181 if (ret) 182 return ret; 183 184 if (tb[IPSET_ATTR_CIDR]) { 185 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 186 if (!cidr || cidr > HOST_MASK) 187 return -IPSET_ERR_INVALID_CIDR; 188 e.cidr = cidr - 1; 189 } 190 191 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 192 193 if (tb[IPSET_ATTR_PROTO]) { 194 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 195 with_ports = ip_set_proto_with_ports(e.proto); 196 197 if (e.proto == 0) 198 return -IPSET_ERR_INVALID_PROTO; 199 } else { 200 return -IPSET_ERR_MISSING_PROTO; 201 } 202 203 if (!(with_ports || e.proto == IPPROTO_ICMP)) 204 e.port = 0; 205 206 with_ports = with_ports && tb[IPSET_ATTR_PORT_TO]; 207 208 if (tb[IPSET_ATTR_CADT_FLAGS]) { 209 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 210 211 if (cadt_flags & IPSET_FLAG_NOMATCH) 212 flags |= (IPSET_FLAG_NOMATCH << 16); 213 } 214 215 if (adt == IPSET_TEST || !(with_ports || tb[IPSET_ATTR_IP_TO])) { 216 e.ip = htonl(ip & 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 port = port_to = ntohs(e.port); 223 if (tb[IPSET_ATTR_PORT_TO]) { 224 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 225 if (port_to < port) 226 swap(port, port_to); 227 } 228 if (tb[IPSET_ATTR_IP_TO]) { 229 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 230 if (ret) 231 return ret; 232 if (ip_to < ip) 233 swap(ip, ip_to); 234 if (ip + UINT_MAX == ip_to) 235 return -IPSET_ERR_HASH_RANGE; 236 } else { 237 ip_set_mask_from_to(ip, ip_to, e.cidr + 1); 238 } 239 ipn = ip; 240 do { 241 ipn = ip_set_range_to_cidr(ipn, ip_to, &cidr); 242 n++; 243 } while (ipn++ < ip_to); 244 245 if (n*(port_to - port + 1) > IPSET_MAX_RANGE) 246 return -ERANGE; 247 248 if (retried) { 249 ip = ntohl(h->next.ip); 250 p = ntohs(h->next.port); 251 } else { 252 p = port; 253 } 254 do { 255 e.ip = htonl(ip); 256 ip = ip_set_range_to_cidr(ip, ip_to, &cidr); 257 e.cidr = cidr - 1; 258 for (; p <= port_to; p++) { 259 e.port = htons(p); 260 ret = adtfn(set, &e, &ext, &ext, flags); 261 if (ret && !ip_set_eexist(ret, flags)) 262 return ret; 263 264 ret = 0; 265 } 266 p = port; 267 } while (ip++ < ip_to); 268 return ret; 269 } 270 271 /* IPv6 variant */ 272 273 struct hash_netport6_elem { 274 union nf_inet_addr ip; 275 __be16 port; 276 u8 proto; 277 u8 cidr:7; 278 u8 nomatch:1; 279 }; 280 281 /* Common functions */ 282 283 static bool 284 hash_netport6_data_equal(const struct hash_netport6_elem *ip1, 285 const struct hash_netport6_elem *ip2, 286 u32 *multi) 287 { 288 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 289 ip1->port == ip2->port && 290 ip1->proto == ip2->proto && 291 ip1->cidr == ip2->cidr; 292 } 293 294 static int 295 hash_netport6_do_data_match(const struct hash_netport6_elem *elem) 296 { 297 return elem->nomatch ? -ENOTEMPTY : 1; 298 } 299 300 static void 301 hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags) 302 { 303 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH); 304 } 305 306 static void 307 hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags) 308 { 309 swap(*flags, elem->nomatch); 310 } 311 312 static void 313 hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr) 314 { 315 ip6_netmask(&elem->ip, cidr); 316 elem->cidr = cidr - 1; 317 } 318 319 static bool 320 hash_netport6_data_list(struct sk_buff *skb, 321 const struct hash_netport6_elem *data) 322 { 323 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 324 325 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 326 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 327 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) || 328 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) || 329 (flags && 330 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 331 goto nla_put_failure; 332 return false; 333 334 nla_put_failure: 335 return true; 336 } 337 338 static void 339 hash_netport6_data_next(struct hash_netport6_elem *next, 340 const struct hash_netport6_elem *d) 341 { 342 next->port = d->port; 343 } 344 345 #undef MTYPE 346 #undef HOST_MASK 347 348 #define MTYPE hash_netport6 349 #define HOST_MASK 128 350 #define IP_SET_EMIT_CREATE 351 #include "ip_set_hash_gen.h" 352 353 static int 354 hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb, 355 const struct xt_action_param *par, 356 enum ipset_adt adt, struct ip_set_adt_opt *opt) 357 { 358 const struct hash_netport6 *h = set->data; 359 ipset_adtfn adtfn = set->variant->adt[adt]; 360 struct hash_netport6_elem e = { 361 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 362 }; 363 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 364 365 if (adt == IPSET_TEST) 366 e.cidr = HOST_MASK - 1; 367 368 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 369 &e.port, &e.proto)) 370 return -EINVAL; 371 372 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 373 ip6_netmask(&e.ip, e.cidr + 1); 374 375 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 376 } 377 378 static int 379 hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[], 380 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 381 { 382 const struct hash_netport6 *h = set->data; 383 ipset_adtfn adtfn = set->variant->adt[adt]; 384 struct hash_netport6_elem e = { .cidr = HOST_MASK - 1 }; 385 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 386 u32 port, port_to; 387 bool with_ports = false; 388 u8 cidr; 389 int ret; 390 391 if (tb[IPSET_ATTR_LINENO]) 392 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 393 394 if (unlikely(!tb[IPSET_ATTR_IP] || 395 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 396 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || 397 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 398 return -IPSET_ERR_PROTOCOL; 399 if (unlikely(tb[IPSET_ATTR_IP_TO])) 400 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 401 402 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 403 if (ret) 404 return ret; 405 406 ret = ip_set_get_extensions(set, tb, &ext); 407 if (ret) 408 return ret; 409 410 if (tb[IPSET_ATTR_CIDR]) { 411 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 412 if (!cidr || cidr > HOST_MASK) 413 return -IPSET_ERR_INVALID_CIDR; 414 e.cidr = cidr - 1; 415 } 416 ip6_netmask(&e.ip, e.cidr + 1); 417 418 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 419 420 if (tb[IPSET_ATTR_PROTO]) { 421 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 422 with_ports = ip_set_proto_with_ports(e.proto); 423 424 if (e.proto == 0) 425 return -IPSET_ERR_INVALID_PROTO; 426 } else { 427 return -IPSET_ERR_MISSING_PROTO; 428 } 429 430 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 431 e.port = 0; 432 433 if (tb[IPSET_ATTR_CADT_FLAGS]) { 434 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 435 436 if (cadt_flags & IPSET_FLAG_NOMATCH) 437 flags |= (IPSET_FLAG_NOMATCH << 16); 438 } 439 440 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 441 ret = adtfn(set, &e, &ext, &ext, flags); 442 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 443 ip_set_eexist(ret, flags) ? 0 : ret; 444 } 445 446 port = ntohs(e.port); 447 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 448 if (port > port_to) 449 swap(port, port_to); 450 451 if (retried) 452 port = ntohs(h->next.port); 453 for (; port <= port_to; port++) { 454 e.port = htons(port); 455 ret = adtfn(set, &e, &ext, &ext, flags); 456 457 if (ret && !ip_set_eexist(ret, flags)) 458 return ret; 459 460 ret = 0; 461 } 462 return ret; 463 } 464 465 static struct ip_set_type hash_netport_type __read_mostly = { 466 .name = "hash:net,port", 467 .protocol = IPSET_PROTOCOL, 468 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH, 469 .dimension = IPSET_DIM_TWO, 470 .family = NFPROTO_UNSPEC, 471 .revision_min = IPSET_TYPE_REV_MIN, 472 .revision_max = IPSET_TYPE_REV_MAX, 473 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 474 .create = hash_netport_create, 475 .create_policy = { 476 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 477 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 478 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 479 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 480 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 481 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 482 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 483 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 484 }, 485 .adt_policy = { 486 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 487 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 488 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 489 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 490 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 491 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 492 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 493 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 494 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 495 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 496 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 497 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 498 .len = IPSET_MAX_COMMENT_SIZE }, 499 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 500 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 501 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 502 }, 503 .me = THIS_MODULE, 504 }; 505 506 static int __init 507 hash_netport_init(void) 508 { 509 return ip_set_type_register(&hash_netport_type); 510 } 511 512 static void __exit 513 hash_netport_fini(void) 514 { 515 rcu_barrier(); 516 ip_set_type_unregister(&hash_netport_type); 517 } 518 519 module_init(hash_netport_init); 520 module_exit(hash_netport_fini); 521