net/netfilter/ipset/ip_set_hash_netiface.c

   1 /* Copyright (C) 2011-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 as
   5  * published by the Free Software Foundation.
   6  */
   7
   8 /* Kernel module implementing an IP set type: the hash:net,iface type */
   9
  10 #include <linux/jhash.h>
  11 #include <linux/module.h>
  12 #include <linux/ip.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/errno.h>
  15 #include <linux/random.h>
  16 #include <net/ip.h>
  17 #include <net/ipv6.h>
  18 #include <net/netlink.h>
  19
  20 #include <linux/netfilter.h>
  21 #include <linux/netfilter_bridge.h>
  22 #include <linux/netfilter/ipset/pfxlen.h>
  23 #include <linux/netfilter/ipset/ip_set.h>
  24 #include <linux/netfilter/ipset/ip_set_hash.h>
  25
  26 #define IPSET_TYPE_REV_MIN      0
  27 /*                              1    nomatch flag support added */
  28 /*                              2    /0 support added */
  29 /*                              3    Counters support added */
  30 /*                              4    Comments support added */
  31 /*                              5    Forceadd support added */
  32 #define IPSET_TYPE_REV_MAX      6 /* skbinfo support added */
  33
  34 MODULE_LICENSE("GPL");
  35 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  36 IP_SET_MODULE_DESC("hash:net,iface", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  37 MODULE_ALIAS("ip_set_hash:net,iface");
  38
  39 /* Type specific function prefix */
  40 #define HTYPE           hash_netiface
  41 #define IP_SET_HASH_WITH_NETS
  42 #define IP_SET_HASH_WITH_MULTI
  43 #define IP_SET_HASH_WITH_NET0
  44
  45 #define STRLCPY(a, b)   strlcpy(a, b, IFNAMSIZ)
  46
  47 /* IPv4 variant */
  48
  49 struct hash_netiface4_elem_hashed {
  50         __be32 ip;
  51         u8 physdev;
  52         u8 cidr;
  53         u8 nomatch;
  54         u8 elem;
  55 };
  56
  57 /* Member elements */
  58 struct hash_netiface4_elem {
  59         __be32 ip;
  60         u8 physdev;
  61         u8 cidr;
  62         u8 nomatch;
  63         u8 elem;
  64         char iface[IFNAMSIZ];
  65 };
  66
  67 /* Common functions */
  68
  69 static inline bool
  70 hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1,
  71                           const struct hash_netiface4_elem *ip2,
  72                           u32 *multi)
  73 {
  74         return ip1->ip == ip2->ip &&
  75                ip1->cidr == ip2->cidr &&
  76                (++*multi) &&
  77                ip1->physdev == ip2->physdev &&
  78                strcmp(ip1->iface, ip2->iface) == 0;
  79 }
  80
  81 static inline int
  82 hash_netiface4_do_data_match(const struct hash_netiface4_elem *elem)
  83 {
  84         return elem->nomatch ? -ENOTEMPTY : 1;
  85 }
  86
  87 static inline 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 inline void
  94 hash_netiface4_data_reset_flags(struct hash_netiface4_elem *elem, u8 *flags)
  95 {
  96         swap(*flags, elem->nomatch);
  97 }
  98
  99 static inline 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
 112         if (data->nomatch)
 113                 flags |= IPSET_FLAG_NOMATCH;
 114         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 115             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
 116             nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
 117             (flags &&
 118              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 119                 goto nla_put_failure;
 120         return false;
 121
 122 nla_put_failure:
 123         return true;
 124 }
 125
 126 static inline void
 127 hash_netiface4_data_next(struct hash_netiface4_elem *next,
 128                          const struct hash_netiface4_elem *d)
 129 {
 130         next->ip = d->ip;
 131 }
 132
 133 #define MTYPE           hash_netiface4
 134 #define HOST_MASK       32
 135 #define HKEY_DATALEN    sizeof(struct hash_netiface4_elem_hashed)
 136 #include "ip_set_hash_gen.h"
 137
 138 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 139 static const char *get_physindev_name(const struct sk_buff *skb)
 140 {
 141         struct net_device *dev = nf_bridge_get_physindev(skb);
 142
 143         return dev ? dev->name : NULL;
 144 }
 145
 146 static const char *get_physoutdev_name(const struct sk_buff *skb)
 147 {
 148         struct net_device *dev = nf_bridge_get_physoutdev(skb);
 149
 150         return dev ? dev->name : NULL;
 151 }
 152 #endif
 153
 154 static int
 155 hash_netiface4_kadt(struct ip_set *set, const struct sk_buff *skb,
 156                     const struct xt_action_param *par,
 157                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
 158 {
 159         struct hash_netiface *h = set->data;
 160         ipset_adtfn adtfn = set->variant->adt[adt];
 161         struct hash_netiface4_elem e = {
 162                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 163                 .elem = 1,
 164         };
 165         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 166
 167         if (adt == IPSET_TEST)
 168                 e.cidr = HOST_MASK;
 169
 170         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 171         e.ip &= ip_set_netmask(e.cidr);
 172
 173 #define IFACE(dir)      (par->dir ? par->dir->name : "")
 174 #define SRCDIR          (opt->flags & IPSET_DIM_TWO_SRC)
 175
 176         if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
 177 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 178                 const char *eiface = SRCDIR ? get_physindev_name(skb) :
 179                                               get_physoutdev_name(skb);
 180
 181                 if (!eiface)
 182                         return -EINVAL;
 183                 STRLCPY(e.iface, eiface);
 184                 e.physdev = 1;
 185 #endif
 186         } else {
 187                 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));
 188         }
 189
 190         if (strlen(e.iface) == 0)
 191                 return -EINVAL;
 192         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 193 }
 194
 195 static int
 196 hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
 197                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 198 {
 199         struct hash_netiface *h = set->data;
 200         ipset_adtfn adtfn = set->variant->adt[adt];
 201         struct hash_netiface4_elem e = { .cidr = HOST_MASK, .elem = 1 };
 202         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 203         u32 ip = 0, ip_to = 0, last;
 204         int ret;
 205
 206         if (tb[IPSET_ATTR_LINENO])
 207                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 208
 209         if (unlikely(!tb[IPSET_ATTR_IP] ||
 210                      !tb[IPSET_ATTR_IFACE] ||
 211                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 212                 return -IPSET_ERR_PROTOCOL;
 213
 214         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
 215         if (ret)
 216                 return ret;
 217
 218         ret = ip_set_get_extensions(set, tb, &ext);
 219         if (ret)
 220                 return ret;
 221
 222         if (tb[IPSET_ATTR_CIDR]) {
 223                 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 224                 if (e.cidr > HOST_MASK)
 225                         return -IPSET_ERR_INVALID_CIDR;
 226         }
 227         nla_strlcpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ);
 228
 229         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 230                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 231
 232                 if (cadt_flags & IPSET_FLAG_PHYSDEV)
 233                         e.physdev = 1;
 234                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 235                         flags |= (IPSET_FLAG_NOMATCH << 16);
 236         }
 237         if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
 238                 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
 239                 ret = adtfn(set, &e, &ext, &ext, flags);
 240                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 241                        ip_set_eexist(ret, flags) ? 0 : ret;
 242         }
 243
 244         if (tb[IPSET_ATTR_IP_TO]) {
 245                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 246                 if (ret)
 247                         return ret;
 248                 if (ip_to < ip)
 249                         swap(ip, ip_to);
 250                 if (ip + UINT_MAX == ip_to)
 251                         return -IPSET_ERR_HASH_RANGE;
 252         } else {
 253                 ip_set_mask_from_to(ip, ip_to, e.cidr);
 254         }
 255
 256         if (retried)
 257                 ip = ntohl(h->next.ip);
 258         while (!after(ip, ip_to)) {
 259                 e.ip = htonl(ip);
 260                 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
 261                 ret = adtfn(set, &e, &ext, &ext, flags);
 262
 263                 if (ret && !ip_set_eexist(ret, flags))
 264                         return ret;
 265
 266                 ret = 0;
 267                 ip = last + 1;
 268         }
 269         return ret;
 270 }
 271
 272 /* IPv6 variant */
 273
 274 struct hash_netiface6_elem_hashed {
 275         union nf_inet_addr ip;
 276         u8 physdev;
 277         u8 cidr;
 278         u8 nomatch;
 279         u8 elem;
 280 };
 281
 282 struct hash_netiface6_elem {
 283         union nf_inet_addr ip;
 284         u8 physdev;
 285         u8 cidr;
 286         u8 nomatch;
 287         u8 elem;
 288         char iface[IFNAMSIZ];
 289 };
 290
 291 /* Common functions */
 292
 293 static inline bool
 294 hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
 295                           const struct hash_netiface6_elem *ip2,
 296                           u32 *multi)
 297 {
 298         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 299                ip1->cidr == ip2->cidr &&
 300                (++*multi) &&
 301                ip1->physdev == ip2->physdev &&
 302                strcmp(ip1->iface, ip2->iface) == 0;
 303 }
 304
 305 static inline int
 306 hash_netiface6_do_data_match(const struct hash_netiface6_elem *elem)
 307 {
 308         return elem->nomatch ? -ENOTEMPTY : 1;
 309 }
 310
 311 static inline void
 312 hash_netiface6_data_set_flags(struct hash_netiface6_elem *elem, u32 flags)
 313 {
 314         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
 315 }
 316
 317 static inline void
 318 hash_netiface6_data_reset_flags(struct hash_netiface6_elem *elem, u8 *flags)
 319 {
 320         swap(*flags, elem->nomatch);
 321 }
 322
 323 static inline void
 324 hash_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr)
 325 {
 326         ip6_netmask(&elem->ip, cidr);
 327         elem->cidr = cidr;
 328 }
 329
 330 static bool
 331 hash_netiface6_data_list(struct sk_buff *skb,
 332                          const struct hash_netiface6_elem *data)
 333 {
 334         u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;
 335
 336         if (data->nomatch)
 337                 flags |= IPSET_FLAG_NOMATCH;
 338         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 339             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
 340             nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
 341             (flags &&
 342              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 343                 goto nla_put_failure;
 344         return false;
 345
 346 nla_put_failure:
 347         return true;
 348 }
 349
 350 static inline void
 351 hash_netiface6_data_next(struct hash_netiface4_elem *next,
 352                          const struct hash_netiface6_elem *d)
 353 {
 354 }
 355
 356 #undef MTYPE
 357 #undef HOST_MASK
 358
 359 #define MTYPE           hash_netiface6
 360 #define HOST_MASK       128
 361 #define HKEY_DATALEN    sizeof(struct hash_netiface6_elem_hashed)
 362 #define IP_SET_EMIT_CREATE
 363 #include "ip_set_hash_gen.h"
 364
 365 static int
 366 hash_netiface6_kadt(struct ip_set *set, const struct sk_buff *skb,
 367                     const struct xt_action_param *par,
 368                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
 369 {
 370         struct hash_netiface *h = set->data;
 371         ipset_adtfn adtfn = set->variant->adt[adt];
 372         struct hash_netiface6_elem e = {
 373                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 374                 .elem = 1,
 375         };
 376         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 377
 378         if (adt == IPSET_TEST)
 379                 e.cidr = HOST_MASK;
 380
 381         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 382         ip6_netmask(&e.ip, e.cidr);
 383
 384         if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
 385 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 386                 const char *eiface = SRCDIR ? get_physindev_name(skb) :
 387                                               get_physoutdev_name(skb);
 388
 389                 if (!eiface)
 390                         return -EINVAL;
 391                 STRLCPY(e.iface, eiface);
 392                 e.physdev = 1;
 393 #endif
 394         } else {
 395                 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));
 396         }
 397
 398         if (strlen(e.iface) == 0)
 399                 return -EINVAL;
 400
 401         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 402 }
 403
 404 static int
 405 hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
 406                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 407 {
 408         ipset_adtfn adtfn = set->variant->adt[adt];
 409         struct hash_netiface6_elem e = { .cidr = HOST_MASK, .elem = 1 };
 410         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 411         int ret;
 412
 413         if (tb[IPSET_ATTR_LINENO])
 414                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 415
 416         if (unlikely(!tb[IPSET_ATTR_IP] ||
 417                      !tb[IPSET_ATTR_IFACE] ||
 418                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 419                 return -IPSET_ERR_PROTOCOL;
 420         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 421                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 422
 423         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 424         if (ret)
 425                 return ret;
 426
 427         ret = ip_set_get_extensions(set, tb, &ext);
 428         if (ret)
 429                 return ret;
 430
 431         if (tb[IPSET_ATTR_CIDR]) {
 432                 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 433                 if (e.cidr > HOST_MASK)
 434                         return -IPSET_ERR_INVALID_CIDR;
 435         }
 436
 437         ip6_netmask(&e.ip, e.cidr);
 438
 439         nla_strlcpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ);
 440
 441         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 442                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 443
 444                 if (cadt_flags & IPSET_FLAG_PHYSDEV)
 445                         e.physdev = 1;
 446                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 447                         flags |= (IPSET_FLAG_NOMATCH << 16);
 448         }
 449
 450         ret = adtfn(set, &e, &ext, &ext, flags);
 451
 452         return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 453                ip_set_eexist(ret, flags) ? 0 : ret;
 454 }
 455
 456 static struct ip_set_type hash_netiface_type __read_mostly = {
 457         .name           = "hash:net,iface",
 458         .protocol       = IPSET_PROTOCOL,
 459         .features       = IPSET_TYPE_IP | IPSET_TYPE_IFACE |
 460                           IPSET_TYPE_NOMATCH,
 461         .dimension      = IPSET_DIM_TWO,
 462         .family         = NFPROTO_UNSPEC,
 463         .revision_min   = IPSET_TYPE_REV_MIN,
 464         .revision_max   = IPSET_TYPE_REV_MAX,
 465         .create         = hash_netiface_create,
 466         .create_policy  = {
 467                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 468                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 469                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 470                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 471                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 472                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 473                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 474         },
 475         .adt_policy     = {
 476                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 477                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 478                 [IPSET_ATTR_IFACE]      = { .type = NLA_NUL_STRING,
 479                                             .len  = IFNAMSIZ - 1 },
 480                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 481                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 482                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 483                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 484                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 485                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 486                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 487                                             .len  = IPSET_MAX_COMMENT_SIZE },
 488                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 489                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 490                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 491         },
 492         .me             = THIS_MODULE,
 493 };
 494
 495 static int __init
 496 hash_netiface_init(void)
 497 {
 498         return ip_set_type_register(&hash_netiface_type);
 499 }
 500
 501 static void __exit
 502 hash_netiface_fini(void)
 503 {
 504         rcu_barrier();
 505         ip_set_type_unregister(&hash_netiface_type);
 506 }
 507
 508 module_init(hash_netiface_init);
 509 module_exit(hash_netiface_fini);