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 42 #define STRSCPY(a, b) strscpy(a, b, IFNAMSIZ) 43 44 /* IPv4 variant */ 45 46 struct hash_netiface4_elem_hashed { 47 __be32 ip; 48 u8 physdev; 49 u8 cidr; 50 u8 nomatch; 51 u8 elem; 52 }; 53 54 /* Member elements */ 55 struct hash_netiface4_elem { 56 __be32 ip; 57 u8 physdev; 58 u8 cidr; 59 u8 nomatch; 60 u8 elem; 61 u8 wildcard; 62 char iface[IFNAMSIZ]; 63 }; 64 65 /* Common functions */ 66 67 static bool 68 hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1, 69 const struct hash_netiface4_elem *ip2, 70 u32 *multi) 71 { 72 return ip1->ip == ip2->ip && 73 ip1->cidr == ip2->cidr && 74 (++*multi) && 75 ip1->physdev == ip2->physdev && 76 (ip1->wildcard ? 77 strncmp(ip1->iface, ip2->iface, strlen(ip1->iface)) == 0 : 78 strcmp(ip1->iface, ip2->iface) == 0); 79 } 80 81 static int 82 hash_netiface4_do_data_match(const struct hash_netiface4_elem *elem) 83 { 84 return elem->nomatch ? -ENOTEMPTY : 1; 85 } 86 87 static void 88 hash_netiface4_data_set_flags(struct hash_netiface4_elem *elem, u32 flags) 89 { 90 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 91 } 92 93 static void 94 hash_netiface4_data_reset_flags(struct hash_netiface4_elem *elem, u8 *flags) 95 { 96 swap(*flags, elem->nomatch); 97 } 98 99 static void 100 hash_netiface4_data_netmask(struct hash_netiface4_elem *elem, u8 cidr) 101 { 102 elem->ip &= ip_set_netmask(cidr); 103 elem->cidr = cidr; 104 } 105 106 static bool 107 hash_netiface4_data_list(struct sk_buff *skb, 108 const struct hash_netiface4_elem *data) 109 { 110 u32 flags = (data->physdev ? IPSET_FLAG_PHYSDEV : 0) | 111 (data->wildcard ? IPSET_FLAG_IFACE_WILDCARD : 0); 112 113 if (data->nomatch) 114 flags |= IPSET_FLAG_NOMATCH; 115 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 116 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || 117 nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) || 118 (flags && 119 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 120 goto nla_put_failure; 121 return false; 122 123 nla_put_failure: 124 return true; 125 } 126 127 static void 128 hash_netiface4_data_next(struct hash_netiface4_elem *next, 129 const struct hash_netiface4_elem *d) 130 { 131 next->ip = d->ip; 132 } 133 134 #define MTYPE hash_netiface4 135 #define HOST_MASK 32 136 #define HKEY_DATALEN sizeof(struct hash_netiface4_elem_hashed) 137 #include "ip_set_hash_gen.h" 138 139 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 140 static const char *get_physindev_name(const struct sk_buff *skb, struct net *net) 141 { 142 struct net_device *dev = nf_bridge_get_physindev(skb, net); 143 144 return dev ? dev->name : NULL; 145 } 146 147 static const char *get_physoutdev_name(const struct sk_buff *skb) 148 { 149 struct net_device *dev = nf_bridge_get_physoutdev(skb); 150 151 return dev ? dev->name : NULL; 152 } 153 #endif 154 155 static int 156 hash_netiface4_kadt(struct ip_set *set, const struct sk_buff *skb, 157 const struct xt_action_param *par, 158 enum ipset_adt adt, struct ip_set_adt_opt *opt) 159 { 160 struct hash_netiface4 *h = set->data; 161 ipset_adtfn adtfn = set->variant->adt[adt]; 162 struct hash_netiface4_elem e = { 163 .cidr = INIT_CIDR(h->rnets[0], HOST_MASK), 164 .elem = 1, 165 }; 166 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 167 168 if (adt == IPSET_TEST) 169 e.cidr = HOST_MASK; 170 171 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 172 e.ip &= ip_set_netmask(e.cidr); 173 174 #define IFACE(dir) (par->state->dir ? par->state->dir->name : "") 175 #define SRCDIR (opt->flags & IPSET_DIM_TWO_SRC) 176 177 if (opt->cmdflags & IPSET_FLAG_PHYSDEV) { 178 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 179 const char *eiface = SRCDIR ? get_physindev_name(skb, xt_net(par)) : 180 get_physoutdev_name(skb); 181 182 if (!eiface) 183 return -EINVAL; 184 STRSCPY(e.iface, eiface); 185 e.physdev = 1; 186 #endif 187 } else { 188 STRSCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out)); 189 } 190 191 if (strlen(e.iface) == 0) 192 return -EINVAL; 193 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 194 } 195 196 static int 197 hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[], 198 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 199 { 200 struct hash_netiface4 *h = set->data; 201 ipset_adtfn adtfn = set->variant->adt[adt]; 202 struct hash_netiface4_elem e = { .cidr = HOST_MASK, .elem = 1 }; 203 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 204 u32 ip = 0, ip_to = 0, i = 0; 205 int ret; 206 207 if (tb[IPSET_ATTR_LINENO]) 208 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 209 210 if (unlikely(!tb[IPSET_ATTR_IP] || 211 !tb[IPSET_ATTR_IFACE] || 212 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 213 return -IPSET_ERR_PROTOCOL; 214 215 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 216 if (ret) 217 return ret; 218 219 ret = ip_set_get_extensions(set, tb, &ext); 220 if (ret) 221 return ret; 222 223 if (tb[IPSET_ATTR_CIDR]) { 224 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 225 if (e.cidr > HOST_MASK) 226 return -IPSET_ERR_INVALID_CIDR; 227 } 228 nla_strscpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ); 229 230 if (tb[IPSET_ATTR_CADT_FLAGS]) { 231 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 232 233 if (cadt_flags & IPSET_FLAG_PHYSDEV) 234 e.physdev = 1; 235 if (cadt_flags & IPSET_FLAG_NOMATCH) 236 flags |= (IPSET_FLAG_NOMATCH << 16); 237 if (cadt_flags & IPSET_FLAG_IFACE_WILDCARD) 238 e.wildcard = 1; 239 } 240 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) { 241 e.ip = htonl(ip & ip_set_hostmask(e.cidr)); 242 ret = adtfn(set, &e, &ext, &ext, flags); 243 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 244 ip_set_eexist(ret, flags) ? 0 : ret; 245 } 246 247 if (tb[IPSET_ATTR_IP_TO]) { 248 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 249 if (ret) 250 return ret; 251 if (ip_to < ip) 252 swap(ip, ip_to); 253 if (ip + UINT_MAX == ip_to) 254 return -IPSET_ERR_HASH_RANGE; 255 } else { 256 ip_set_mask_from_to(ip, ip_to, e.cidr); 257 } 258 259 if (retried) 260 ip = ntohl(h->next.ip); 261 do { 262 i++; 263 e.ip = htonl(ip); 264 if (i > IPSET_MAX_RANGE) { 265 hash_netiface4_data_next(&h->next, &e); 266 return -ERANGE; 267 } 268 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr); 269 ret = adtfn(set, &e, &ext, &ext, flags); 270 271 if (ret && !ip_set_eexist(ret, flags)) 272 return ret; 273 274 ret = 0; 275 } while (ip++ < ip_to); 276 return ret; 277 } 278 279 /* IPv6 variant */ 280 281 struct hash_netiface6_elem_hashed { 282 union nf_inet_addr ip; 283 u8 physdev; 284 u8 cidr; 285 u8 nomatch; 286 u8 elem; 287 }; 288 289 struct hash_netiface6_elem { 290 union nf_inet_addr ip; 291 u8 physdev; 292 u8 cidr; 293 u8 nomatch; 294 u8 elem; 295 u8 wildcard; 296 char iface[IFNAMSIZ]; 297 }; 298 299 /* Common functions */ 300 301 static bool 302 hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1, 303 const struct hash_netiface6_elem *ip2, 304 u32 *multi) 305 { 306 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 307 ip1->cidr == ip2->cidr && 308 (++*multi) && 309 ip1->physdev == ip2->physdev && 310 (ip1->wildcard ? 311 strncmp(ip1->iface, ip2->iface, strlen(ip1->iface)) == 0 : 312 strcmp(ip1->iface, ip2->iface) == 0); 313 } 314 315 static int 316 hash_netiface6_do_data_match(const struct hash_netiface6_elem *elem) 317 { 318 return elem->nomatch ? -ENOTEMPTY : 1; 319 } 320 321 static void 322 hash_netiface6_data_set_flags(struct hash_netiface6_elem *elem, u32 flags) 323 { 324 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 325 } 326 327 static void 328 hash_netiface6_data_reset_flags(struct hash_netiface6_elem *elem, u8 *flags) 329 { 330 swap(*flags, elem->nomatch); 331 } 332 333 static void 334 hash_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr) 335 { 336 ip6_netmask(&elem->ip, cidr); 337 elem->cidr = cidr; 338 } 339 340 static bool 341 hash_netiface6_data_list(struct sk_buff *skb, 342 const struct hash_netiface6_elem *data) 343 { 344 u32 flags = (data->physdev ? IPSET_FLAG_PHYSDEV : 0) | 345 (data->wildcard ? IPSET_FLAG_IFACE_WILDCARD : 0); 346 347 if (data->nomatch) 348 flags |= IPSET_FLAG_NOMATCH; 349 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 350 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || 351 nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) || 352 (flags && 353 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 354 goto nla_put_failure; 355 return false; 356 357 nla_put_failure: 358 return true; 359 } 360 361 static void 362 hash_netiface6_data_next(struct hash_netiface6_elem *next, 363 const struct hash_netiface6_elem *d) 364 { 365 } 366 367 #undef MTYPE 368 #undef HOST_MASK 369 370 #define MTYPE hash_netiface6 371 #define HOST_MASK 128 372 #define HKEY_DATALEN sizeof(struct hash_netiface6_elem_hashed) 373 #define IP_SET_EMIT_CREATE 374 #include "ip_set_hash_gen.h" 375 376 static int 377 hash_netiface6_kadt(struct ip_set *set, const struct sk_buff *skb, 378 const struct xt_action_param *par, 379 enum ipset_adt adt, struct ip_set_adt_opt *opt) 380 { 381 struct hash_netiface6 *h = set->data; 382 ipset_adtfn adtfn = set->variant->adt[adt]; 383 struct hash_netiface6_elem e = { 384 .cidr = INIT_CIDR(h->rnets[0], HOST_MASK), 385 .elem = 1, 386 }; 387 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 388 389 if (adt == IPSET_TEST) 390 e.cidr = HOST_MASK; 391 392 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 393 ip6_netmask(&e.ip, e.cidr); 394 395 if (opt->cmdflags & IPSET_FLAG_PHYSDEV) { 396 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 397 const char *eiface = SRCDIR ? get_physindev_name(skb, xt_net(par)) : 398 get_physoutdev_name(skb); 399 400 if (!eiface) 401 return -EINVAL; 402 STRSCPY(e.iface, eiface); 403 e.physdev = 1; 404 #endif 405 } else { 406 STRSCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out)); 407 } 408 409 if (strlen(e.iface) == 0) 410 return -EINVAL; 411 412 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 413 } 414 415 static int 416 hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[], 417 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 418 { 419 ipset_adtfn adtfn = set->variant->adt[adt]; 420 struct hash_netiface6_elem e = { .cidr = HOST_MASK, .elem = 1 }; 421 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 422 int ret; 423 424 if (tb[IPSET_ATTR_LINENO]) 425 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 426 427 if (unlikely(!tb[IPSET_ATTR_IP] || 428 !tb[IPSET_ATTR_IFACE] || 429 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 430 return -IPSET_ERR_PROTOCOL; 431 if (unlikely(tb[IPSET_ATTR_IP_TO])) 432 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 433 434 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 435 if (ret) 436 return ret; 437 438 ret = ip_set_get_extensions(set, tb, &ext); 439 if (ret) 440 return ret; 441 442 if (tb[IPSET_ATTR_CIDR]) { 443 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 444 if (e.cidr > HOST_MASK) 445 return -IPSET_ERR_INVALID_CIDR; 446 } 447 448 ip6_netmask(&e.ip, e.cidr); 449 450 nla_strscpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ); 451 452 if (tb[IPSET_ATTR_CADT_FLAGS]) { 453 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 454 455 if (cadt_flags & IPSET_FLAG_PHYSDEV) 456 e.physdev = 1; 457 if (cadt_flags & IPSET_FLAG_NOMATCH) 458 flags |= (IPSET_FLAG_NOMATCH << 16); 459 if (cadt_flags & IPSET_FLAG_IFACE_WILDCARD) 460 e.wildcard = 1; 461 } 462 463 ret = adtfn(set, &e, &ext, &ext, flags); 464 465 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 466 ip_set_eexist(ret, flags) ? 0 : ret; 467 } 468 469 static struct ip_set_type hash_netiface_type __read_mostly = { 470 .name = "hash:net,iface", 471 .protocol = IPSET_PROTOCOL, 472 .features = IPSET_TYPE_IP | IPSET_TYPE_IFACE | 473 IPSET_TYPE_NOMATCH, 474 .dimension = IPSET_DIM_TWO, 475 .family = NFPROTO_UNSPEC, 476 .revision_min = IPSET_TYPE_REV_MIN, 477 .revision_max = IPSET_TYPE_REV_MAX, 478 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 479 .create = hash_netiface_create, 480 .create_policy = { 481 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 482 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 483 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 484 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 485 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 486 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 487 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 488 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 489 }, 490 .adt_policy = { 491 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 492 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 493 [IPSET_ATTR_IFACE] = { .type = NLA_NUL_STRING, 494 .len = IFNAMSIZ - 1 }, 495 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 496 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 497 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 498 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 499 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 500 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 501 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 502 .len = IPSET_MAX_COMMENT_SIZE }, 503 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 504 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 505 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 506 }, 507 .me = THIS_MODULE, 508 }; 509 510 static int __init 511 hash_netiface_init(void) 512 { 513 return ip_set_type_register(&hash_netiface_type); 514 } 515 516 static void __exit 517 hash_netiface_fini(void) 518 { 519 rcu_barrier(); 520 ip_set_type_unregister(&hash_netiface_type); 521 } 522 523 module_init(hash_netiface_init); 524 module_exit(hash_netiface_fini); 525