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 #define IPSET_TYPE_REV_MAX 7 /* skbinfo support added */ 30 31 MODULE_LICENSE("GPL"); 32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 33 IP_SET_MODULE_DESC("hash:net,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 34 MODULE_ALIAS("ip_set_hash:net,port"); 35 36 /* Type specific function prefix */ 37 #define HTYPE hash_netport 38 #define IP_SET_HASH_WITH_PROTO 39 #define IP_SET_HASH_WITH_NETS 40 41 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0 42 * However this way we have to store internally cidr - 1, 43 * dancing back and forth. 44 */ 45 #define IP_SET_HASH_WITH_NETS_PACKED 46 47 /* IPv4 variant */ 48 49 /* Member elements */ 50 struct hash_netport4_elem { 51 __be32 ip; 52 __be16 port; 53 u8 proto; 54 u8 cidr:7; 55 u8 nomatch:1; 56 }; 57 58 /* Common functions */ 59 60 static bool 61 hash_netport4_data_equal(const struct hash_netport4_elem *ip1, 62 const struct hash_netport4_elem *ip2, 63 u32 *multi) 64 { 65 return ip1->ip == ip2->ip && 66 ip1->port == ip2->port && 67 ip1->proto == ip2->proto && 68 ip1->cidr == ip2->cidr; 69 } 70 71 static int 72 hash_netport4_do_data_match(const struct hash_netport4_elem *elem) 73 { 74 return elem->nomatch ? -ENOTEMPTY : 1; 75 } 76 77 static void 78 hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags) 79 { 80 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH); 81 } 82 83 static void 84 hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags) 85 { 86 swap(*flags, elem->nomatch); 87 } 88 89 static void 90 hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr) 91 { 92 elem->ip &= ip_set_netmask(cidr); 93 elem->cidr = cidr - 1; 94 } 95 96 static bool 97 hash_netport4_data_list(struct sk_buff *skb, 98 const struct hash_netport4_elem *data) 99 { 100 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 101 102 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 103 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 104 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) || 105 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) || 106 (flags && 107 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 108 goto nla_put_failure; 109 return false; 110 111 nla_put_failure: 112 return true; 113 } 114 115 static void 116 hash_netport4_data_next(struct hash_netport4_elem *next, 117 const struct hash_netport4_elem *d) 118 { 119 next->ip = d->ip; 120 next->port = d->port; 121 } 122 123 #define MTYPE hash_netport4 124 #define HOST_MASK 32 125 #include "ip_set_hash_gen.h" 126 127 static int 128 hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb, 129 const struct xt_action_param *par, 130 enum ipset_adt adt, struct ip_set_adt_opt *opt) 131 { 132 const struct hash_netport4 *h = set->data; 133 ipset_adtfn adtfn = set->variant->adt[adt]; 134 struct hash_netport4_elem e = { 135 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 136 }; 137 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 138 139 if (adt == IPSET_TEST) 140 e.cidr = HOST_MASK - 1; 141 142 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 143 &e.port, &e.proto)) 144 return -EINVAL; 145 146 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 147 e.ip &= ip_set_netmask(e.cidr + 1); 148 149 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 150 } 151 152 static int 153 hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[], 154 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 155 { 156 const struct hash_netport4 *h = set->data; 157 ipset_adtfn adtfn = set->variant->adt[adt]; 158 struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 }; 159 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 160 u32 port, port_to, p = 0, ip = 0, ip_to = 0; 161 bool with_ports = false; 162 u8 cidr; 163 int ret; 164 165 if (tb[IPSET_ATTR_LINENO]) 166 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 167 168 if (unlikely(!tb[IPSET_ATTR_IP] || 169 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 170 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || 171 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 172 return -IPSET_ERR_PROTOCOL; 173 174 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 175 if (ret) 176 return ret; 177 178 ret = ip_set_get_extensions(set, tb, &ext); 179 if (ret) 180 return ret; 181 182 if (tb[IPSET_ATTR_CIDR]) { 183 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 184 if (!cidr || cidr > HOST_MASK) 185 return -IPSET_ERR_INVALID_CIDR; 186 e.cidr = cidr - 1; 187 } 188 189 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 190 191 if (tb[IPSET_ATTR_PROTO]) { 192 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 193 with_ports = ip_set_proto_with_ports(e.proto); 194 195 if (e.proto == 0) 196 return -IPSET_ERR_INVALID_PROTO; 197 } else { 198 return -IPSET_ERR_MISSING_PROTO; 199 } 200 201 if (!(with_ports || e.proto == IPPROTO_ICMP)) 202 e.port = 0; 203 204 with_ports = with_ports && tb[IPSET_ATTR_PORT_TO]; 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 || !(with_ports || tb[IPSET_ATTR_IP_TO])) { 214 e.ip = htonl(ip & ip_set_hostmask(e.cidr + 1)); 215 ret = adtfn(set, &e, &ext, &ext, flags); 216 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 217 ip_set_eexist(ret, flags) ? 0 : ret; 218 } 219 220 port = port_to = ntohs(e.port); 221 if (tb[IPSET_ATTR_PORT_TO]) { 222 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 223 if (port_to < port) 224 swap(port, port_to); 225 } 226 if (tb[IPSET_ATTR_IP_TO]) { 227 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 228 if (ret) 229 return ret; 230 if (ip_to < ip) 231 swap(ip, ip_to); 232 if (ip + UINT_MAX == ip_to) 233 return -IPSET_ERR_HASH_RANGE; 234 } else { 235 ip_set_mask_from_to(ip, ip_to, e.cidr + 1); 236 } 237 238 if (retried) { 239 ip = ntohl(h->next.ip); 240 p = ntohs(h->next.port); 241 } else { 242 p = port; 243 } 244 do { 245 e.ip = htonl(ip); 246 ip = ip_set_range_to_cidr(ip, ip_to, &cidr); 247 e.cidr = cidr - 1; 248 for (; p <= port_to; p++) { 249 e.port = htons(p); 250 ret = adtfn(set, &e, &ext, &ext, flags); 251 if (ret && !ip_set_eexist(ret, flags)) 252 return ret; 253 254 ret = 0; 255 } 256 p = port; 257 } while (ip++ < ip_to); 258 return ret; 259 } 260 261 /* IPv6 variant */ 262 263 struct hash_netport6_elem { 264 union nf_inet_addr ip; 265 __be16 port; 266 u8 proto; 267 u8 cidr:7; 268 u8 nomatch:1; 269 }; 270 271 /* Common functions */ 272 273 static bool 274 hash_netport6_data_equal(const struct hash_netport6_elem *ip1, 275 const struct hash_netport6_elem *ip2, 276 u32 *multi) 277 { 278 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 279 ip1->port == ip2->port && 280 ip1->proto == ip2->proto && 281 ip1->cidr == ip2->cidr; 282 } 283 284 static int 285 hash_netport6_do_data_match(const struct hash_netport6_elem *elem) 286 { 287 return elem->nomatch ? -ENOTEMPTY : 1; 288 } 289 290 static void 291 hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags) 292 { 293 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH); 294 } 295 296 static void 297 hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags) 298 { 299 swap(*flags, elem->nomatch); 300 } 301 302 static void 303 hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr) 304 { 305 ip6_netmask(&elem->ip, cidr); 306 elem->cidr = cidr - 1; 307 } 308 309 static bool 310 hash_netport6_data_list(struct sk_buff *skb, 311 const struct hash_netport6_elem *data) 312 { 313 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 314 315 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 316 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 317 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) || 318 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) || 319 (flags && 320 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 321 goto nla_put_failure; 322 return false; 323 324 nla_put_failure: 325 return true; 326 } 327 328 static void 329 hash_netport6_data_next(struct hash_netport6_elem *next, 330 const struct hash_netport6_elem *d) 331 { 332 next->port = d->port; 333 } 334 335 #undef MTYPE 336 #undef HOST_MASK 337 338 #define MTYPE hash_netport6 339 #define HOST_MASK 128 340 #define IP_SET_EMIT_CREATE 341 #include "ip_set_hash_gen.h" 342 343 static int 344 hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb, 345 const struct xt_action_param *par, 346 enum ipset_adt adt, struct ip_set_adt_opt *opt) 347 { 348 const struct hash_netport6 *h = set->data; 349 ipset_adtfn adtfn = set->variant->adt[adt]; 350 struct hash_netport6_elem e = { 351 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 352 }; 353 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 354 355 if (adt == IPSET_TEST) 356 e.cidr = HOST_MASK - 1; 357 358 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 359 &e.port, &e.proto)) 360 return -EINVAL; 361 362 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 363 ip6_netmask(&e.ip, e.cidr + 1); 364 365 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 366 } 367 368 static int 369 hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[], 370 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 371 { 372 const struct hash_netport6 *h = set->data; 373 ipset_adtfn adtfn = set->variant->adt[adt]; 374 struct hash_netport6_elem e = { .cidr = HOST_MASK - 1 }; 375 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 376 u32 port, port_to; 377 bool with_ports = false; 378 u8 cidr; 379 int ret; 380 381 if (tb[IPSET_ATTR_LINENO]) 382 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 383 384 if (unlikely(!tb[IPSET_ATTR_IP] || 385 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 386 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || 387 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 388 return -IPSET_ERR_PROTOCOL; 389 if (unlikely(tb[IPSET_ATTR_IP_TO])) 390 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 391 392 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 393 if (ret) 394 return ret; 395 396 ret = ip_set_get_extensions(set, tb, &ext); 397 if (ret) 398 return ret; 399 400 if (tb[IPSET_ATTR_CIDR]) { 401 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 402 if (!cidr || cidr > HOST_MASK) 403 return -IPSET_ERR_INVALID_CIDR; 404 e.cidr = cidr - 1; 405 } 406 ip6_netmask(&e.ip, e.cidr + 1); 407 408 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 409 410 if (tb[IPSET_ATTR_PROTO]) { 411 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 412 with_ports = ip_set_proto_with_ports(e.proto); 413 414 if (e.proto == 0) 415 return -IPSET_ERR_INVALID_PROTO; 416 } else { 417 return -IPSET_ERR_MISSING_PROTO; 418 } 419 420 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 421 e.port = 0; 422 423 if (tb[IPSET_ATTR_CADT_FLAGS]) { 424 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 425 426 if (cadt_flags & IPSET_FLAG_NOMATCH) 427 flags |= (IPSET_FLAG_NOMATCH << 16); 428 } 429 430 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 431 ret = adtfn(set, &e, &ext, &ext, flags); 432 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 433 ip_set_eexist(ret, flags) ? 0 : ret; 434 } 435 436 port = ntohs(e.port); 437 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 438 if (port > port_to) 439 swap(port, port_to); 440 441 if (retried) 442 port = ntohs(h->next.port); 443 for (; port <= port_to; port++) { 444 e.port = htons(port); 445 ret = adtfn(set, &e, &ext, &ext, flags); 446 447 if (ret && !ip_set_eexist(ret, flags)) 448 return ret; 449 450 ret = 0; 451 } 452 return ret; 453 } 454 455 static struct ip_set_type hash_netport_type __read_mostly = { 456 .name = "hash:net,port", 457 .protocol = IPSET_PROTOCOL, 458 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | 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 = hash_netport_create, 464 .create_policy = { 465 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 466 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 467 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 468 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 469 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 470 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 471 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 472 }, 473 .adt_policy = { 474 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 475 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 476 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 477 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 478 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 479 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 480 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 481 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 482 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 483 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 484 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 485 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 486 .len = IPSET_MAX_COMMENT_SIZE }, 487 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 488 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 489 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 490 }, 491 .me = THIS_MODULE, 492 }; 493 494 static int __init 495 hash_netport_init(void) 496 { 497 return ip_set_type_register(&hash_netport_type); 498 } 499 500 static void __exit 501 hash_netport_fini(void) 502 { 503 rcu_barrier(); 504 ip_set_type_unregister(&hash_netport_type); 505 } 506 507 module_init(hash_netport_init); 508 module_exit(hash_netport_fini); 509