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 32MODULE_LICENSE("GPL"); 33MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 34IP_SET_MODULE_DESC("hash:net,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 35MODULE_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 */ 51struct 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 61static bool 62hash_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 72static int 73hash_netport4_do_data_match(const struct hash_netport4_elem *elem) 74{ 75 return elem->nomatch ? -ENOTEMPTY : 1; 76} 77 78static void 79hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags) 80{ 81 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH); 82} 83 84static void 85hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags) 86{ 87 swap(*flags, elem->nomatch); 88} 89 90static void 91hash_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 97static bool 98hash_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 112nla_put_failure: 113 return true; 114} 115 116static void 117hash_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 128static int 129hash_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 153static int 154hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[], 155 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 156{ 157 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, i = 0; 162 bool with_ports = false; 163 u8 cidr; 164 int ret; 165 166 if (tb[IPSET_ATTR_LINENO]) 167 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 168 169 if (unlikely(!tb[IPSET_ATTR_IP] || 170 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 171 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || 172 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 173 return -IPSET_ERR_PROTOCOL; 174 175 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 176 if (ret) 177 return ret; 178 179 ret = ip_set_get_extensions(set, tb, &ext); 180 if (ret) 181 return ret; 182 183 if (tb[IPSET_ATTR_CIDR]) { 184 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 185 if (!cidr || cidr > HOST_MASK) 186 return -IPSET_ERR_INVALID_CIDR; 187 e.cidr = cidr - 1; 188 } 189 190 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 191 192 if (tb[IPSET_ATTR_PROTO]) { 193 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 194 with_ports = ip_set_proto_with_ports(e.proto); 195 196 if (e.proto == 0) 197 return -IPSET_ERR_INVALID_PROTO; 198 } else { 199 return -IPSET_ERR_MISSING_PROTO; 200 } 201 202 if (!(with_ports || e.proto == IPPROTO_ICMP)) 203 e.port = 0; 204 205 with_ports = with_ports && tb[IPSET_ATTR_PORT_TO]; 206 207 if (tb[IPSET_ATTR_CADT_FLAGS]) { 208 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 209 210 if (cadt_flags & IPSET_FLAG_NOMATCH) 211 flags |= (IPSET_FLAG_NOMATCH << 16); 212 } 213 214 if (adt == IPSET_TEST || !(with_ports || tb[IPSET_ATTR_IP_TO])) { 215 e.ip = htonl(ip & 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 port = port_to = ntohs(e.port); 222 if (tb[IPSET_ATTR_PORT_TO]) { 223 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 224 if (port_to < port) 225 swap(port, port_to); 226 } 227 if (tb[IPSET_ATTR_IP_TO]) { 228 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 229 if (ret) 230 return ret; 231 if (ip_to < ip) 232 swap(ip, ip_to); 233 if (ip + UINT_MAX == ip_to) 234 return -IPSET_ERR_HASH_RANGE; 235 } else { 236 ip_set_mask_from_to(ip, ip_to, e.cidr + 1); 237 } 238 239 if (retried) { 240 ip = ntohl(h->next.ip); 241 p = ntohs(h->next.port); 242 } else { 243 p = port; 244 } 245 do { 246 e.ip = htonl(ip); 247 ip = ip_set_range_to_cidr(ip, ip_to, &cidr); 248 e.cidr = cidr - 1; 249 for (; p <= port_to; p++, i++) { 250 e.port = htons(p); 251 if (i > IPSET_MAX_RANGE) { 252 hash_netport4_data_next(&h->next, &e); 253 return -ERANGE; 254 } 255 ret = adtfn(set, &e, &ext, &ext, flags); 256 if (ret && !ip_set_eexist(ret, flags)) 257 return ret; 258 259 ret = 0; 260 } 261 p = port; 262 } while (ip++ < ip_to); 263 return ret; 264} 265 266/* IPv6 variant */ 267 268struct hash_netport6_elem { 269 union nf_inet_addr ip; 270 __be16 port; 271 u8 proto; 272 u8 cidr:7; 273 u8 nomatch:1; 274}; 275 276/* Common functions */ 277 278static bool 279hash_netport6_data_equal(const struct hash_netport6_elem *ip1, 280 const struct hash_netport6_elem *ip2, 281 u32 *multi) 282{ 283 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 284 ip1->port == ip2->port && 285 ip1->proto == ip2->proto && 286 ip1->cidr == ip2->cidr; 287} 288 289static int 290hash_netport6_do_data_match(const struct hash_netport6_elem *elem) 291{ 292 return elem->nomatch ? -ENOTEMPTY : 1; 293} 294 295static void 296hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags) 297{ 298 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH); 299} 300 301static void 302hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags) 303{ 304 swap(*flags, elem->nomatch); 305} 306 307static void 308hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr) 309{ 310 ip6_netmask(&elem->ip, cidr); 311 elem->cidr = cidr - 1; 312} 313 314static bool 315hash_netport6_data_list(struct sk_buff *skb, 316 const struct hash_netport6_elem *data) 317{ 318 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 319 320 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 321 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 322 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) || 323 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) || 324 (flags && 325 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 326 goto nla_put_failure; 327 return false; 328 329nla_put_failure: 330 return true; 331} 332 333static void 334hash_netport6_data_next(struct hash_netport6_elem *next, 335 const struct hash_netport6_elem *d) 336{ 337 next->port = d->port; 338} 339 340#undef MTYPE 341#undef HOST_MASK 342 343#define MTYPE hash_netport6 344#define HOST_MASK 128 345#define IP_SET_EMIT_CREATE 346#include "ip_set_hash_gen.h" 347 348static int 349hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb, 350 const struct xt_action_param *par, 351 enum ipset_adt adt, struct ip_set_adt_opt *opt) 352{ 353 const struct hash_netport6 *h = set->data; 354 ipset_adtfn adtfn = set->variant->adt[adt]; 355 struct hash_netport6_elem e = { 356 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 357 }; 358 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 359 360 if (adt == IPSET_TEST) 361 e.cidr = HOST_MASK - 1; 362 363 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 364 &e.port, &e.proto)) 365 return -EINVAL; 366 367 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 368 ip6_netmask(&e.ip, e.cidr + 1); 369 370 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 371} 372 373static int 374hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[], 375 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 376{ 377 const struct hash_netport6 *h = set->data; 378 ipset_adtfn adtfn = set->variant->adt[adt]; 379 struct hash_netport6_elem e = { .cidr = HOST_MASK - 1 }; 380 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 381 u32 port, port_to; 382 bool with_ports = false; 383 u8 cidr; 384 int ret; 385 386 if (tb[IPSET_ATTR_LINENO]) 387 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 388 389 if (unlikely(!tb[IPSET_ATTR_IP] || 390 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 391 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || 392 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 393 return -IPSET_ERR_PROTOCOL; 394 if (unlikely(tb[IPSET_ATTR_IP_TO])) 395 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 396 397 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 398 if (ret) 399 return ret; 400 401 ret = ip_set_get_extensions(set, tb, &ext); 402 if (ret) 403 return ret; 404 405 if (tb[IPSET_ATTR_CIDR]) { 406 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 407 if (!cidr || cidr > HOST_MASK) 408 return -IPSET_ERR_INVALID_CIDR; 409 e.cidr = cidr - 1; 410 } 411 ip6_netmask(&e.ip, e.cidr + 1); 412 413 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 414 415 if (tb[IPSET_ATTR_PROTO]) { 416 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 417 with_ports = ip_set_proto_with_ports(e.proto); 418 419 if (e.proto == 0) 420 return -IPSET_ERR_INVALID_PROTO; 421 } else { 422 return -IPSET_ERR_MISSING_PROTO; 423 } 424 425 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 426 e.port = 0; 427 428 if (tb[IPSET_ATTR_CADT_FLAGS]) { 429 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 430 431 if (cadt_flags & IPSET_FLAG_NOMATCH) 432 flags |= (IPSET_FLAG_NOMATCH << 16); 433 } 434 435 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 436 ret = adtfn(set, &e, &ext, &ext, flags); 437 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 438 ip_set_eexist(ret, flags) ? 0 : ret; 439 } 440 441 port = ntohs(e.port); 442 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 443 if (port > port_to) 444 swap(port, port_to); 445 446 if (retried) 447 port = ntohs(h->next.port); 448 for (; port <= port_to; port++) { 449 e.port = htons(port); 450 ret = adtfn(set, &e, &ext, &ext, flags); 451 452 if (ret && !ip_set_eexist(ret, flags)) 453 return ret; 454 455 ret = 0; 456 } 457 return ret; 458} 459 460static struct ip_set_type hash_netport_type __read_mostly = { 461 .name = "hash:net,port", 462 .protocol = IPSET_PROTOCOL, 463 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH, 464 .dimension = IPSET_DIM_TWO, 465 .family = NFPROTO_UNSPEC, 466 .revision_min = IPSET_TYPE_REV_MIN, 467 .revision_max = IPSET_TYPE_REV_MAX, 468 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 469 .create = hash_netport_create, 470 .create_policy = { 471 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 472 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 473 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 474 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 475 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 476 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 477 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 478 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 479 }, 480 .adt_policy = { 481 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 482 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 483 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 484 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 485 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 486 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 487 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 488 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 489 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 490 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 491 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 492 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 493 .len = IPSET_MAX_COMMENT_SIZE }, 494 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 495 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 496 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 497 }, 498 .me = THIS_MODULE, 499}; 500 501static int __init 502hash_netport_init(void) 503{ 504 return ip_set_type_register(&hash_netport_type); 505} 506 507static void __exit 508hash_netport_fini(void) 509{ 510 rcu_barrier(); 511 ip_set_type_unregister(&hash_netport_type); 512} 513 514module_init(hash_netport_init); 515module_exit(hash_netport_fini); 516