net/netfilter/ipset/ip_set_hash_netiface.c

   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 #define IPSET_TYPE_REV_MAX      7 /* interface wildcard support added */
  30
  31 MODULE_LICENSE("GPL");
  32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
  33 IP_SET_MODULE_DESC("hash:net,iface", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  34 MODULE_ALIAS("ip_set_hash:net,iface");
  35
  36 /* Type specific function prefix */
  37 #define HTYPE           hash_netiface
  38 #define IP_SET_HASH_WITH_NETS
  39 #define IP_SET_HASH_WITH_MULTI
  40 #define IP_SET_HASH_WITH_NET0
  41
  42 #define STRLCPY(a, b)   strlcpy(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)
 141 {
 142         struct net_device *dev = nf_bridge_get_physindev(skb);
 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->nets[0].cidr[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) :
 180                                               get_physoutdev_name(skb);
 181
 182                 if (!eiface)
 183                         return -EINVAL;
 184                 STRLCPY(e.iface, eiface);
 185                 e.physdev = 1;
 186 #endif
 187         } else {
 188                 STRLCPY(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;
 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_strlcpy(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                 e.ip = htonl(ip);
 263                 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
 264                 ret = adtfn(set, &e, &ext, &ext, flags);
 265
 266                 if (ret && !ip_set_eexist(ret, flags))
 267                         return ret;
 268
 269                 ret = 0;
 270         } while (ip++ < ip_to);
 271         return ret;
 272 }
 273
 274 /* IPv6 variant */
 275
 276 struct hash_netiface6_elem_hashed {
 277         union nf_inet_addr ip;
 278         u8 physdev;
 279         u8 cidr;
 280         u8 nomatch;
 281         u8 elem;
 282 };
 283
 284 struct hash_netiface6_elem {
 285         union nf_inet_addr ip;
 286         u8 physdev;
 287         u8 cidr;
 288         u8 nomatch;
 289         u8 elem;
 290         u8 wildcard;
 291         char iface[IFNAMSIZ];
 292 };
 293
 294 /* Common functions */
 295
 296 static bool
 297 hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
 298                           const struct hash_netiface6_elem *ip2,
 299                           u32 *multi)
 300 {
 301         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 302                ip1->cidr == ip2->cidr &&
 303                (++*multi) &&
 304                ip1->physdev == ip2->physdev &&
 305                (ip1->wildcard ?
 306                 strncmp(ip1->iface, ip2->iface, strlen(ip1->iface)) == 0 :
 307                 strcmp(ip1->iface, ip2->iface) == 0);
 308 }
 309
 310 static int
 311 hash_netiface6_do_data_match(const struct hash_netiface6_elem *elem)
 312 {
 313         return elem->nomatch ? -ENOTEMPTY : 1;
 314 }
 315
 316 static void
 317 hash_netiface6_data_set_flags(struct hash_netiface6_elem *elem, u32 flags)
 318 {
 319         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
 320 }
 321
 322 static void
 323 hash_netiface6_data_reset_flags(struct hash_netiface6_elem *elem, u8 *flags)
 324 {
 325         swap(*flags, elem->nomatch);
 326 }
 327
 328 static void
 329 hash_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr)
 330 {
 331         ip6_netmask(&elem->ip, cidr);
 332         elem->cidr = cidr;
 333 }
 334
 335 static bool
 336 hash_netiface6_data_list(struct sk_buff *skb,
 337                          const struct hash_netiface6_elem *data)
 338 {
 339         u32 flags = (data->physdev ? IPSET_FLAG_PHYSDEV : 0) |
 340                     (data->wildcard ? IPSET_FLAG_IFACE_WILDCARD : 0);
 341
 342         if (data->nomatch)
 343                 flags |= IPSET_FLAG_NOMATCH;
 344         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 345             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
 346             nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
 347             (flags &&
 348              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 349                 goto nla_put_failure;
 350         return false;
 351
 352 nla_put_failure:
 353         return true;
 354 }
 355
 356 static void
 357 hash_netiface6_data_next(struct hash_netiface6_elem *next,
 358                          const struct hash_netiface6_elem *d)
 359 {
 360 }
 361
 362 #undef MTYPE
 363 #undef HOST_MASK
 364
 365 #define MTYPE           hash_netiface6
 366 #define HOST_MASK       128
 367 #define HKEY_DATALEN    sizeof(struct hash_netiface6_elem_hashed)
 368 #define IP_SET_EMIT_CREATE
 369 #include "ip_set_hash_gen.h"
 370
 371 static int
 372 hash_netiface6_kadt(struct ip_set *set, const struct sk_buff *skb,
 373                     const struct xt_action_param *par,
 374                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
 375 {
 376         struct hash_netiface6 *h = set->data;
 377         ipset_adtfn adtfn = set->variant->adt[adt];
 378         struct hash_netiface6_elem e = {
 379                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 380                 .elem = 1,
 381         };
 382         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 383
 384         if (adt == IPSET_TEST)
 385                 e.cidr = HOST_MASK;
 386
 387         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 388         ip6_netmask(&e.ip, e.cidr);
 389
 390         if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
 391 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 392                 const char *eiface = SRCDIR ? get_physindev_name(skb) :
 393                                               get_physoutdev_name(skb);
 394
 395                 if (!eiface)
 396                         return -EINVAL;
 397                 STRLCPY(e.iface, eiface);
 398                 e.physdev = 1;
 399 #endif
 400         } else {
 401                 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));
 402         }
 403
 404         if (strlen(e.iface) == 0)
 405                 return -EINVAL;
 406
 407         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 408 }
 409
 410 static int
 411 hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
 412                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 413 {
 414         ipset_adtfn adtfn = set->variant->adt[adt];
 415         struct hash_netiface6_elem e = { .cidr = HOST_MASK, .elem = 1 };
 416         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 417         int ret;
 418
 419         if (tb[IPSET_ATTR_LINENO])
 420                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 421
 422         if (unlikely(!tb[IPSET_ATTR_IP] ||
 423                      !tb[IPSET_ATTR_IFACE] ||
 424                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 425                 return -IPSET_ERR_PROTOCOL;
 426         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 427                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 428
 429         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 430         if (ret)
 431                 return ret;
 432
 433         ret = ip_set_get_extensions(set, tb, &ext);
 434         if (ret)
 435                 return ret;
 436
 437         if (tb[IPSET_ATTR_CIDR]) {
 438                 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 439                 if (e.cidr > HOST_MASK)
 440                         return -IPSET_ERR_INVALID_CIDR;
 441         }
 442
 443         ip6_netmask(&e.ip, e.cidr);
 444
 445         nla_strlcpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ);
 446
 447         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 448                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 449
 450                 if (cadt_flags & IPSET_FLAG_PHYSDEV)
 451                         e.physdev = 1;
 452                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 453                         flags |= (IPSET_FLAG_NOMATCH << 16);
 454                 if (cadt_flags & IPSET_FLAG_IFACE_WILDCARD)
 455                         e.wildcard = 1;
 456         }
 457
 458         ret = adtfn(set, &e, &ext, &ext, flags);
 459
 460         return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 461                ip_set_eexist(ret, flags) ? 0 : ret;
 462 }
 463
 464 static struct ip_set_type hash_netiface_type __read_mostly = {
 465         .name           = "hash:net,iface",
 466         .protocol       = IPSET_PROTOCOL,
 467         .features       = IPSET_TYPE_IP | IPSET_TYPE_IFACE |
 468                           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         = hash_netiface_create,
 474         .create_policy  = {
 475                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 476                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 477                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 478                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 479                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 480                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 481                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 482         },
 483         .adt_policy     = {
 484                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 485                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 486                 [IPSET_ATTR_IFACE]      = { .type = NLA_NUL_STRING,
 487                                             .len  = IFNAMSIZ - 1 },
 488                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 489                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 490                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 491                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 492                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 493                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 494                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 495                                             .len  = IPSET_MAX_COMMENT_SIZE },
 496                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 497                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 498                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 499         },
 500         .me             = THIS_MODULE,
 501 };
 502
 503 static int __init
 504 hash_netiface_init(void)
 505 {
 506         return ip_set_type_register(&hash_netiface_type);
 507 }
 508
 509 static void __exit
 510 hash_netiface_fini(void)
 511 {
 512         rcu_barrier();
 513         ip_set_type_unregister(&hash_netiface_type);
 514 }
 515
 516 module_init(hash_netiface_init);
 517 module_exit(hash_netiface_fini);