net/netfilter/ipset/ip_set_hash_netport.c

   1 /* Copyright (C) 2003-2013 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,port 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/ipset/pfxlen.h>
  22 #include <linux/netfilter/ipset/ip_set.h>
  23 #include <linux/netfilter/ipset/ip_set_getport.h>
  24 #include <linux/netfilter/ipset/ip_set_hash.h>
  25
  26 #define IPSET_TYPE_REV_MIN      0
  27 /*                              1    SCTP and UDPLITE support added */
  28 /*                              2    Range as input support for IPv4 added */
  29 /*                              3    nomatch flag support added */
  30 /*                              4    Counters support added */
  31 /*                              5    Comments support added */
  32 /*                              6    Forceadd support added */
  33 #define IPSET_TYPE_REV_MAX      7 /* skbinfo support added */
  34
  35 MODULE_LICENSE("GPL");
  36 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  37 IP_SET_MODULE_DESC("hash:net,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  38 MODULE_ALIAS("ip_set_hash:net,port");
  39
  40 /* Type specific function prefix */
  41 #define HTYPE           hash_netport
  42 #define IP_SET_HASH_WITH_PROTO
  43 #define IP_SET_HASH_WITH_NETS
  44
  45 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0
  46  * However this way we have to store internally cidr - 1,
  47  * dancing back and forth.
  48  */
  49 #define IP_SET_HASH_WITH_NETS_PACKED
  50
  51 /* IPv4 variant */
  52
  53 /* Member elements */
  54 struct hash_netport4_elem {
  55         __be32 ip;
  56         __be16 port;
  57         u8 proto;
  58         u8 cidr:7;
  59         u8 nomatch:1;
  60 };
  61
  62 /* Common functions */
  63
  64 static inline bool
  65 hash_netport4_data_equal(const struct hash_netport4_elem *ip1,
  66                          const struct hash_netport4_elem *ip2,
  67                          u32 *multi)
  68 {
  69         return ip1->ip == ip2->ip &&
  70                ip1->port == ip2->port &&
  71                ip1->proto == ip2->proto &&
  72                ip1->cidr == ip2->cidr;
  73 }
  74
  75 static inline int
  76 hash_netport4_do_data_match(const struct hash_netport4_elem *elem)
  77 {
  78         return elem->nomatch ? -ENOTEMPTY : 1;
  79 }
  80
  81 static inline void
  82 hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags)
  83 {
  84         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
  85 }
  86
  87 static inline void
  88 hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags)
  89 {
  90         swap(*flags, elem->nomatch);
  91 }
  92
  93 static inline void
  94 hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr)
  95 {
  96         elem->ip &= ip_set_netmask(cidr);
  97         elem->cidr = cidr - 1;
  98 }
  99
 100 static bool
 101 hash_netport4_data_list(struct sk_buff *skb,
 102                         const struct hash_netport4_elem *data)
 103 {
 104         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 105
 106         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 107             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 108             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
 109             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 110             (flags &&
 111              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 112                 goto nla_put_failure;
 113         return false;
 114
 115 nla_put_failure:
 116         return true;
 117 }
 118
 119 static inline void
 120 hash_netport4_data_next(struct hash_netport4_elem *next,
 121                         const struct hash_netport4_elem *d)
 122 {
 123         next->ip = d->ip;
 124         next->port = d->port;
 125 }
 126
 127 #define MTYPE           hash_netport4
 128 #define HOST_MASK       32
 129 #include "ip_set_hash_gen.h"
 130
 131 static int
 132 hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 133                    const struct xt_action_param *par,
 134                    enum ipset_adt adt, struct ip_set_adt_opt *opt)
 135 {
 136         const struct hash_netport *h = set->data;
 137         ipset_adtfn adtfn = set->variant->adt[adt];
 138         struct hash_netport4_elem e = {
 139                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 140         };
 141         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 142
 143         if (adt == IPSET_TEST)
 144                 e.cidr = HOST_MASK - 1;
 145
 146         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 147                                  &e.port, &e.proto))
 148                 return -EINVAL;
 149
 150         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 151         e.ip &= ip_set_netmask(e.cidr + 1);
 152
 153         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 154 }
 155
 156 static int
 157 hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
 158                    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 159 {
 160         const struct hash_netport *h = set->data;
 161         ipset_adtfn adtfn = set->variant->adt[adt];
 162         struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 };
 163         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 164         u32 port, port_to, p = 0, ip = 0, ip_to = 0, last;
 165         bool with_ports = false;
 166         u8 cidr;
 167         int ret;
 168
 169         if (tb[IPSET_ATTR_LINENO])
 170                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 171
 172         if (unlikely(!tb[IPSET_ATTR_IP] ||
 173                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 174                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 175                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 176                 return -IPSET_ERR_PROTOCOL;
 177
 178         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
 179         if (ret)
 180                 return ret;
 181
 182         ret = ip_set_get_extensions(set, tb, &ext);
 183         if (ret)
 184                 return ret;
 185
 186         if (tb[IPSET_ATTR_CIDR]) {
 187                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 188                 if (!cidr || cidr > HOST_MASK)
 189                         return -IPSET_ERR_INVALID_CIDR;
 190                 e.cidr = cidr - 1;
 191         }
 192
 193         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 194
 195         if (tb[IPSET_ATTR_PROTO]) {
 196                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 197                 with_ports = ip_set_proto_with_ports(e.proto);
 198
 199                 if (e.proto == 0)
 200                         return -IPSET_ERR_INVALID_PROTO;
 201         } else {
 202                 return -IPSET_ERR_MISSING_PROTO;
 203         }
 204
 205         if (!(with_ports || e.proto == IPPROTO_ICMP))
 206                 e.port = 0;
 207
 208         with_ports = with_ports && tb[IPSET_ATTR_PORT_TO];
 209
 210         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 211                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 212
 213                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 214                         flags |= (IPSET_FLAG_NOMATCH << 16);
 215         }
 216
 217         if (adt == IPSET_TEST || !(with_ports || tb[IPSET_ATTR_IP_TO])) {
 218                 e.ip = htonl(ip & ip_set_hostmask(e.cidr + 1));
 219                 ret = adtfn(set, &e, &ext, &ext, flags);
 220                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 221                        ip_set_eexist(ret, flags) ? 0 : ret;
 222         }
 223
 224         port = port_to = ntohs(e.port);
 225         if (tb[IPSET_ATTR_PORT_TO]) {
 226                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 227                 if (port_to < port)
 228                         swap(port, port_to);
 229         }
 230         if (tb[IPSET_ATTR_IP_TO]) {
 231                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 232                 if (ret)
 233                         return ret;
 234                 if (ip_to < ip)
 235                         swap(ip, ip_to);
 236                 if (ip + UINT_MAX == ip_to)
 237                         return -IPSET_ERR_HASH_RANGE;
 238         } else {
 239                 ip_set_mask_from_to(ip, ip_to, e.cidr + 1);
 240         }
 241
 242         if (retried)
 243                 ip = ntohl(h->next.ip);
 244         while (!after(ip, ip_to)) {
 245                 e.ip = htonl(ip);
 246                 last = ip_set_range_to_cidr(ip, ip_to, &cidr);
 247                 e.cidr = cidr - 1;
 248                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 249                                                        : port;
 250                 for (; p <= port_to; p++) {
 251                         e.port = htons(p);
 252                         ret = adtfn(set, &e, &ext, &ext, flags);
 253
 254                         if (ret && !ip_set_eexist(ret, flags))
 255                                 return ret;
 256
 257                         ret = 0;
 258                 }
 259                 ip = last + 1;
 260         }
 261         return ret;
 262 }
 263
 264 /* IPv6 variant */
 265
 266 struct hash_netport6_elem {
 267         union nf_inet_addr ip;
 268         __be16 port;
 269         u8 proto;
 270         u8 cidr:7;
 271         u8 nomatch:1;
 272 };
 273
 274 /* Common functions */
 275
 276 static inline bool
 277 hash_netport6_data_equal(const struct hash_netport6_elem *ip1,
 278                          const struct hash_netport6_elem *ip2,
 279                          u32 *multi)
 280 {
 281         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 282                ip1->port == ip2->port &&
 283                ip1->proto == ip2->proto &&
 284                ip1->cidr == ip2->cidr;
 285 }
 286
 287 static inline int
 288 hash_netport6_do_data_match(const struct hash_netport6_elem *elem)
 289 {
 290         return elem->nomatch ? -ENOTEMPTY : 1;
 291 }
 292
 293 static inline void
 294 hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags)
 295 {
 296         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
 297 }
 298
 299 static inline void
 300 hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags)
 301 {
 302         swap(*flags, elem->nomatch);
 303 }
 304
 305 static inline void
 306 hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr)
 307 {
 308         ip6_netmask(&elem->ip, cidr);
 309         elem->cidr = cidr - 1;
 310 }
 311
 312 static bool
 313 hash_netport6_data_list(struct sk_buff *skb,
 314                         const struct hash_netport6_elem *data)
 315 {
 316         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 317
 318         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 319             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 320             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
 321             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
 322             (flags &&
 323              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 324                 goto nla_put_failure;
 325         return false;
 326
 327 nla_put_failure:
 328         return true;
 329 }
 330
 331 static inline void
 332 hash_netport6_data_next(struct hash_netport4_elem *next,
 333                         const struct hash_netport6_elem *d)
 334 {
 335         next->port = d->port;
 336 }
 337
 338 #undef MTYPE
 339 #undef HOST_MASK
 340
 341 #define MTYPE           hash_netport6
 342 #define HOST_MASK       128
 343 #define IP_SET_EMIT_CREATE
 344 #include "ip_set_hash_gen.h"
 345
 346 static int
 347 hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 348                    const struct xt_action_param *par,
 349                    enum ipset_adt adt, struct ip_set_adt_opt *opt)
 350 {
 351         const struct hash_netport *h = set->data;
 352         ipset_adtfn adtfn = set->variant->adt[adt];
 353         struct hash_netport6_elem e = {
 354                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 355         };
 356         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 357
 358         if (adt == IPSET_TEST)
 359                 e.cidr = HOST_MASK - 1;
 360
 361         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 362                                  &e.port, &e.proto))
 363                 return -EINVAL;
 364
 365         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 366         ip6_netmask(&e.ip, e.cidr + 1);
 367
 368         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 369 }
 370
 371 static int
 372 hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[],
 373                    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 374 {
 375         const struct hash_netport *h = set->data;
 376         ipset_adtfn adtfn = set->variant->adt[adt];
 377         struct hash_netport6_elem e = { .cidr = HOST_MASK  - 1 };
 378         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 379         u32 port, port_to;
 380         bool with_ports = false;
 381         u8 cidr;
 382         int ret;
 383
 384         if (tb[IPSET_ATTR_LINENO])
 385                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 386
 387         if (unlikely(!tb[IPSET_ATTR_IP] ||
 388                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 389                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 390                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 391                 return -IPSET_ERR_PROTOCOL;
 392         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 393                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 394
 395         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 396         if (ret)
 397                 return ret;
 398
 399         ret = ip_set_get_extensions(set, tb, &ext);
 400         if (ret)
 401                 return ret;
 402
 403         if (tb[IPSET_ATTR_CIDR]) {
 404                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 405                 if (!cidr || cidr > HOST_MASK)
 406                         return -IPSET_ERR_INVALID_CIDR;
 407                 e.cidr = cidr - 1;
 408         }
 409         ip6_netmask(&e.ip, e.cidr + 1);
 410
 411         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 412
 413         if (tb[IPSET_ATTR_PROTO]) {
 414                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 415                 with_ports = ip_set_proto_with_ports(e.proto);
 416
 417                 if (e.proto == 0)
 418                         return -IPSET_ERR_INVALID_PROTO;
 419         } else {
 420                 return -IPSET_ERR_MISSING_PROTO;
 421         }
 422
 423         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 424                 e.port = 0;
 425
 426         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 427                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 428
 429                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 430                         flags |= (IPSET_FLAG_NOMATCH << 16);
 431         }
 432
 433         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 434                 ret = adtfn(set, &e, &ext, &ext, flags);
 435                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 436                        ip_set_eexist(ret, flags) ? 0 : ret;
 437         }
 438
 439         port = ntohs(e.port);
 440         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 441         if (port > port_to)
 442                 swap(port, port_to);
 443
 444         if (retried)
 445                 port = ntohs(h->next.port);
 446         for (; port <= port_to; port++) {
 447                 e.port = htons(port);
 448                 ret = adtfn(set, &e, &ext, &ext, flags);
 449
 450                 if (ret && !ip_set_eexist(ret, flags))
 451                         return ret;
 452
 453                 ret = 0;
 454         }
 455         return ret;
 456 }
 457
 458 static struct ip_set_type hash_netport_type __read_mostly = {
 459         .name           = "hash:net,port",
 460         .protocol       = IPSET_PROTOCOL,
 461         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH,
 462         .dimension      = IPSET_DIM_TWO,
 463         .family         = NFPROTO_UNSPEC,
 464         .revision_min   = IPSET_TYPE_REV_MIN,
 465         .revision_max   = IPSET_TYPE_REV_MAX,
 466         .create         = hash_netport_create,
 467         .create_policy  = {
 468                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 469                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 470                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 471                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 472                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 473                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 474                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 475         },
 476         .adt_policy     = {
 477                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 478                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 479                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 480                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 481                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 482                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 483                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 484                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 485                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 486                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 487                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 488                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 489                                             .len  = IPSET_MAX_COMMENT_SIZE },
 490                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 491                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 492                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 493         },
 494         .me             = THIS_MODULE,
 495 };
 496
 497 static int __init
 498 hash_netport_init(void)
 499 {
 500         return ip_set_type_register(&hash_netport_type);
 501 }
 502
 503 static void __exit
 504 hash_netport_fini(void)
 505 {
 506         rcu_barrier();
 507         ip_set_type_unregister(&hash_netport_type);
 508 }
 509
 510 module_init(hash_netport_init);
 511 module_exit(hash_netport_fini);