1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (C) 2011-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */ 3 4 /* Kernel module implementing an IP set type: the hash:net,iface 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_bridge.h> 18 #include <linux/netfilter/ipset/pfxlen.h> 19 #include <linux/netfilter/ipset/ip_set.h> 20 #include <linux/netfilter/ipset/ip_set_hash.h> 21 22 #define IPSET_TYPE_REV_MIN 0 23 /* 1 nomatch flag support added */ 24 /* 2 /0 support added */ 25 /* 3 Counters support added */ 26 /* 4 Comments support added */ 27 /* 5 Forceadd support added */ 28 /* 6 skbinfo support added */ 29 /* 7 interface wildcard 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,iface", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 35 MODULE_ALIAS("ip_set_hash:net,iface"); 36 37 /* Type specific function prefix */ 38 #define HTYPE hash_netiface 39 #define IP_SET_HASH_WITH_NETS 40 #define IP_SET_HASH_WITH_MULTI 41 #define IP_SET_HASH_WITH_NET0 42 43 #define STRLCPY(a, b) strlcpy(a, b, IFNAMSIZ) 44 45 /* IPv4 variant */ 46 47 struct hash_netiface4_elem_hashed { 48 __be32 ip; 49 u8 physdev; 50 u8 cidr; 51 u8 nomatch; 52 u8 elem; 53 }; 54 55 /* Member elements */ 56 struct hash_netiface4_elem { 57 __be32 ip; 58 u8 physdev; 59 u8 cidr; 60 u8 nomatch; 61 u8 elem; 62 u8 wildcard; 63 char iface[IFNAMSIZ]; 64 }; 65 66 /* Common functions */ 67 68 static bool 69 hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1, 70 const struct hash_netiface4_elem *ip2, 71 u32 *multi) 72 { 73 return ip1->ip == ip2->ip && 74 ip1->cidr == ip2->cidr && 75 (++*multi) && 76 ip1->physdev == ip2->physdev && 77 (ip1->wildcard ? 78 strncmp(ip1->iface, ip2->iface, strlen(ip1->iface)) == 0 : 79 strcmp(ip1->iface, ip2->iface) == 0); 80 } 81 82 static int 83 hash_netiface4_do_data_match(const struct hash_netiface4_elem *elem) 84 { 85 return elem->nomatch ? -ENOTEMPTY : 1; 86 } 87 88 static void 89 hash_netiface4_data_set_flags(struct hash_netiface4_elem *elem, u32 flags) 90 { 91 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 92 } 93 94 static void 95 hash_netiface4_data_reset_flags(struct hash_netiface4_elem *elem, u8 *flags) 96 { 97 swap(*flags, elem->nomatch); 98 } 99 100 static void 101 hash_netiface4_data_netmask(struct hash_netiface4_elem *elem, u8 cidr) 102 { 103 elem->ip &= ip_set_netmask(cidr); 104 elem->cidr = cidr; 105 } 106 107 static bool 108 hash_netiface4_data_list(struct sk_buff *skb, 109 const struct hash_netiface4_elem *data) 110 { 111 u32 flags = (data->physdev ? IPSET_FLAG_PHYSDEV : 0) | 112 (data->wildcard ? IPSET_FLAG_IFACE_WILDCARD : 0); 113 114 if (data->nomatch) 115 flags |= IPSET_FLAG_NOMATCH; 116 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 117 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || 118 nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) || 119 (flags && 120 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 121 goto nla_put_failure; 122 return false; 123 124 nla_put_failure: 125 return true; 126 } 127 128 static void 129 hash_netiface4_data_next(struct hash_netiface4_elem *next, 130 const struct hash_netiface4_elem *d) 131 { 132 next->ip = d->ip; 133 } 134 135 #define MTYPE hash_netiface4 136 #define HOST_MASK 32 137 #define HKEY_DATALEN sizeof(struct hash_netiface4_elem_hashed) 138 #include "ip_set_hash_gen.h" 139 140 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 141 static const char *get_physindev_name(const struct sk_buff *skb) 142 { 143 struct net_device *dev = nf_bridge_get_physindev(skb); 144 145 return dev ? dev->name : NULL; 146 } 147 148 static const char *get_physoutdev_name(const struct sk_buff *skb) 149 { 150 struct net_device *dev = nf_bridge_get_physoutdev(skb); 151 152 return dev ? dev->name : NULL; 153 } 154 #endif 155 156 static int 157 hash_netiface4_kadt(struct ip_set *set, const struct sk_buff *skb, 158 const struct xt_action_param *par, 159 enum ipset_adt adt, struct ip_set_adt_opt *opt) 160 { 161 struct hash_netiface4 *h = set->data; 162 ipset_adtfn adtfn = set->variant->adt[adt]; 163 struct hash_netiface4_elem e = { 164 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 165 .elem = 1, 166 }; 167 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 168 169 if (adt == IPSET_TEST) 170 e.cidr = HOST_MASK; 171 172 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 173 e.ip &= ip_set_netmask(e.cidr); 174 175 #define IFACE(dir) (par->state->dir ? par->state->dir->name : "") 176 #define SRCDIR (opt->flags & IPSET_DIM_TWO_SRC) 177 178 if (opt->cmdflags & IPSET_FLAG_PHYSDEV) { 179 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 180 const char *eiface = SRCDIR ? get_physindev_name(skb) : 181 get_physoutdev_name(skb); 182 183 if (!eiface) 184 return -EINVAL; 185 STRLCPY(e.iface, eiface); 186 e.physdev = 1; 187 #endif 188 } else { 189 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out)); 190 } 191 192 if (strlen(e.iface) == 0) 193 return -EINVAL; 194 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 195 } 196 197 static int 198 hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[], 199 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 200 { 201 struct hash_netiface4 *h = set->data; 202 ipset_adtfn adtfn = set->variant->adt[adt]; 203 struct hash_netiface4_elem e = { .cidr = HOST_MASK, .elem = 1 }; 204 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 205 u32 ip = 0, ip_to = 0; 206 int ret; 207 208 if (tb[IPSET_ATTR_LINENO]) 209 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 210 211 if (unlikely(!tb[IPSET_ATTR_IP] || 212 !tb[IPSET_ATTR_IFACE] || 213 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 214 return -IPSET_ERR_PROTOCOL; 215 216 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 217 if (ret) 218 return ret; 219 220 ret = ip_set_get_extensions(set, tb, &ext); 221 if (ret) 222 return ret; 223 224 if (tb[IPSET_ATTR_CIDR]) { 225 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 226 if (e.cidr > HOST_MASK) 227 return -IPSET_ERR_INVALID_CIDR; 228 } 229 nla_strscpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ); 230 231 if (tb[IPSET_ATTR_CADT_FLAGS]) { 232 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 233 234 if (cadt_flags & IPSET_FLAG_PHYSDEV) 235 e.physdev = 1; 236 if (cadt_flags & IPSET_FLAG_NOMATCH) 237 flags |= (IPSET_FLAG_NOMATCH << 16); 238 if (cadt_flags & IPSET_FLAG_IFACE_WILDCARD) 239 e.wildcard = 1; 240 } 241 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) { 242 e.ip = htonl(ip & ip_set_hostmask(e.cidr)); 243 ret = adtfn(set, &e, &ext, &ext, flags); 244 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 245 ip_set_eexist(ret, flags) ? 0 : ret; 246 } 247 248 if (tb[IPSET_ATTR_IP_TO]) { 249 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 250 if (ret) 251 return ret; 252 if (ip_to < ip) 253 swap(ip, ip_to); 254 if (ip + UINT_MAX == ip_to) 255 return -IPSET_ERR_HASH_RANGE; 256 } else { 257 ip_set_mask_from_to(ip, ip_to, e.cidr); 258 } 259 260 if (retried) 261 ip = ntohl(h->next.ip); 262 do { 263 e.ip = htonl(ip); 264 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr); 265 ret = adtfn(set, &e, &ext, &ext, flags); 266 267 if (ret && !ip_set_eexist(ret, flags)) 268 return ret; 269 270 ret = 0; 271 } while (ip++ < ip_to); 272 return ret; 273 } 274 275 /* IPv6 variant */ 276 277 struct hash_netiface6_elem_hashed { 278 union nf_inet_addr ip; 279 u8 physdev; 280 u8 cidr; 281 u8 nomatch; 282 u8 elem; 283 }; 284 285 struct hash_netiface6_elem { 286 union nf_inet_addr ip; 287 u8 physdev; 288 u8 cidr; 289 u8 nomatch; 290 u8 elem; 291 u8 wildcard; 292 char iface[IFNAMSIZ]; 293 }; 294 295 /* Common functions */ 296 297 static bool 298 hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1, 299 const struct hash_netiface6_elem *ip2, 300 u32 *multi) 301 { 302 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 303 ip1->cidr == ip2->cidr && 304 (++*multi) && 305 ip1->physdev == ip2->physdev && 306 (ip1->wildcard ? 307 strncmp(ip1->iface, ip2->iface, strlen(ip1->iface)) == 0 : 308 strcmp(ip1->iface, ip2->iface) == 0); 309 } 310 311 static int 312 hash_netiface6_do_data_match(const struct hash_netiface6_elem *elem) 313 { 314 return elem->nomatch ? -ENOTEMPTY : 1; 315 } 316 317 static void 318 hash_netiface6_data_set_flags(struct hash_netiface6_elem *elem, u32 flags) 319 { 320 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 321 } 322 323 static void 324 hash_netiface6_data_reset_flags(struct hash_netiface6_elem *elem, u8 *flags) 325 { 326 swap(*flags, elem->nomatch); 327 } 328 329 static void 330 hash_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr) 331 { 332 ip6_netmask(&elem->ip, cidr); 333 elem->cidr = cidr; 334 } 335 336 static bool 337 hash_netiface6_data_list(struct sk_buff *skb, 338 const struct hash_netiface6_elem *data) 339 { 340 u32 flags = (data->physdev ? IPSET_FLAG_PHYSDEV : 0) | 341 (data->wildcard ? IPSET_FLAG_IFACE_WILDCARD : 0); 342 343 if (data->nomatch) 344 flags |= IPSET_FLAG_NOMATCH; 345 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 346 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || 347 nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) || 348 (flags && 349 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 350 goto nla_put_failure; 351 return false; 352 353 nla_put_failure: 354 return true; 355 } 356 357 static void 358 hash_netiface6_data_next(struct hash_netiface6_elem *next, 359 const struct hash_netiface6_elem *d) 360 { 361 } 362 363 #undef MTYPE 364 #undef HOST_MASK 365 366 #define MTYPE hash_netiface6 367 #define HOST_MASK 128 368 #define HKEY_DATALEN sizeof(struct hash_netiface6_elem_hashed) 369 #define IP_SET_EMIT_CREATE 370 #include "ip_set_hash_gen.h" 371 372 static int 373 hash_netiface6_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 struct hash_netiface6 *h = set->data; 378 ipset_adtfn adtfn = set->variant->adt[adt]; 379 struct hash_netiface6_elem e = { 380 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 381 .elem = 1, 382 }; 383 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 384 385 if (adt == IPSET_TEST) 386 e.cidr = HOST_MASK; 387 388 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 389 ip6_netmask(&e.ip, e.cidr); 390 391 if (opt->cmdflags & IPSET_FLAG_PHYSDEV) { 392 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 393 const char *eiface = SRCDIR ? get_physindev_name(skb) : 394 get_physoutdev_name(skb); 395 396 if (!eiface) 397 return -EINVAL; 398 STRLCPY(e.iface, eiface); 399 e.physdev = 1; 400 #endif 401 } else { 402 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out)); 403 } 404 405 if (strlen(e.iface) == 0) 406 return -EINVAL; 407 408 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 409 } 410 411 static int 412 hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[], 413 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 414 { 415 ipset_adtfn adtfn = set->variant->adt[adt]; 416 struct hash_netiface6_elem e = { .cidr = HOST_MASK, .elem = 1 }; 417 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 418 int ret; 419 420 if (tb[IPSET_ATTR_LINENO]) 421 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 422 423 if (unlikely(!tb[IPSET_ATTR_IP] || 424 !tb[IPSET_ATTR_IFACE] || 425 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 426 return -IPSET_ERR_PROTOCOL; 427 if (unlikely(tb[IPSET_ATTR_IP_TO])) 428 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 429 430 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 431 if (ret) 432 return ret; 433 434 ret = ip_set_get_extensions(set, tb, &ext); 435 if (ret) 436 return ret; 437 438 if (tb[IPSET_ATTR_CIDR]) { 439 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 440 if (e.cidr > HOST_MASK) 441 return -IPSET_ERR_INVALID_CIDR; 442 } 443 444 ip6_netmask(&e.ip, e.cidr); 445 446 nla_strscpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ); 447 448 if (tb[IPSET_ATTR_CADT_FLAGS]) { 449 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 450 451 if (cadt_flags & IPSET_FLAG_PHYSDEV) 452 e.physdev = 1; 453 if (cadt_flags & IPSET_FLAG_NOMATCH) 454 flags |= (IPSET_FLAG_NOMATCH << 16); 455 if (cadt_flags & IPSET_FLAG_IFACE_WILDCARD) 456 e.wildcard = 1; 457 } 458 459 ret = adtfn(set, &e, &ext, &ext, flags); 460 461 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 462 ip_set_eexist(ret, flags) ? 0 : ret; 463 } 464 465 static struct ip_set_type hash_netiface_type __read_mostly = { 466 .name = "hash:net,iface", 467 .protocol = IPSET_PROTOCOL, 468 .features = IPSET_TYPE_IP | IPSET_TYPE_IFACE | 469 IPSET_TYPE_NOMATCH, 470 .dimension = IPSET_DIM_TWO, 471 .family = NFPROTO_UNSPEC, 472 .revision_min = IPSET_TYPE_REV_MIN, 473 .revision_max = IPSET_TYPE_REV_MAX, 474 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 475 .create = hash_netiface_create, 476 .create_policy = { 477 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 478 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 479 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 480 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 481 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 482 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 483 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 484 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 485 }, 486 .adt_policy = { 487 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 488 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 489 [IPSET_ATTR_IFACE] = { .type = NLA_NUL_STRING, 490 .len = IFNAMSIZ - 1 }, 491 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 492 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 493 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 494 [IPSET_ATTR_LINENO] = { .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_netiface_init(void) 508 { 509 return ip_set_type_register(&hash_netiface_type); 510 } 511 512 static void __exit 513 hash_netiface_fini(void) 514 { 515 rcu_barrier(); 516 ip_set_type_unregister(&hash_netiface_type); 517 } 518 519 module_init(hash_netiface_init); 520 module_exit(hash_netiface_fini); 521