net/netfilter/ipset/ip_set_hash_net.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 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_hash.h>
  24
  25 #define IPSET_TYPE_REV_MIN      0
  26 /*                              1    Range as input support for IPv4 added */
  27 /*                              2    nomatch flag support added */
  28 /*                              3    Counters support added */
  29 #define IPSET_TYPE_REV_MAX      4 /* Comments support added */
  30
  31 MODULE_LICENSE("GPL");
  32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  33 IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  34 MODULE_ALIAS("ip_set_hash:net");
  35
  36 /* Type specific function prefix */
  37 #define HTYPE           hash_net
  38 #define IP_SET_HASH_WITH_NETS
  39
  40 /* IPv4 variant */
  41
  42 /* Member elements  */
  43 struct hash_net4_elem {
  44         __be32 ip;
  45         u16 padding0;
  46         u8 nomatch;
  47         u8 cidr;
  48 };
  49
  50 /* Common functions */
  51
  52 static inline bool
  53 hash_net4_data_equal(const struct hash_net4_elem *ip1,
  54                      const struct hash_net4_elem *ip2,
  55                      u32 *multi)
  56 {
  57         return ip1->ip == ip2->ip &&
  58                ip1->cidr == ip2->cidr;
  59 }
  60
  61 static inline int
  62 hash_net4_do_data_match(const struct hash_net4_elem *elem)
  63 {
  64         return elem->nomatch ? -ENOTEMPTY : 1;
  65 }
  66
  67 static inline void
  68 hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags)
  69 {
  70         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
  71 }
  72
  73 static inline void
  74 hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags)
  75 {
  76         swap(*flags, elem->nomatch);
  77 }
  78
  79 static inline void
  80 hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
  81 {
  82         elem->ip &= ip_set_netmask(cidr);
  83         elem->cidr = cidr;
  84 }
  85
  86 static bool
  87 hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
  88 {
  89         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
  90
  91         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  92             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
  93             (flags &&
  94              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
  95                 goto nla_put_failure;
  96         return 0;
  97
  98 nla_put_failure:
  99         return 1;
 100 }
 101
 102 static inline void
 103 hash_net4_data_next(struct hash_net4_elem *next,
 104                     const struct hash_net4_elem *d)
 105 {
 106         next->ip = d->ip;
 107 }
 108
 109 #define MTYPE           hash_net4
 110 #define PF              4
 111 #define HOST_MASK       32
 112 #include "ip_set_hash_gen.h"
 113
 114 static int
 115 hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
 116                const struct xt_action_param *par,
 117                enum ipset_adt adt, struct ip_set_adt_opt *opt)
 118 {
 119         const struct hash_net *h = set->data;
 120         ipset_adtfn adtfn = set->variant->adt[adt];
 121         struct hash_net4_elem e = {
 122                 .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 123         };
 124         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 125
 126         if (e.cidr == 0)
 127                 return -EINVAL;
 128         if (adt == IPSET_TEST)
 129                 e.cidr = HOST_MASK;
 130
 131         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 132         e.ip &= ip_set_netmask(e.cidr);
 133
 134         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 135 }
 136
 137 static int
 138 hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
 139                enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 140 {
 141         const struct hash_net *h = set->data;
 142         ipset_adtfn adtfn = set->variant->adt[adt];
 143         struct hash_net4_elem e = { .cidr = HOST_MASK };
 144         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 145         u32 ip = 0, ip_to = 0, last;
 146         int ret;
 147
 148         if (unlikely(!tb[IPSET_ATTR_IP] ||
 149                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 150                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
 151                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 152                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 153                 return -IPSET_ERR_PROTOCOL;
 154
 155         if (tb[IPSET_ATTR_LINENO])
 156                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 157
 158         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
 159               ip_set_get_extensions(set, tb, &ext);
 160         if (ret)
 161                 return ret;
 162
 163         if (tb[IPSET_ATTR_CIDR]) {
 164                 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 165                 if (!e.cidr || e.cidr > HOST_MASK)
 166                         return -IPSET_ERR_INVALID_CIDR;
 167         }
 168
 169         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 170                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 171                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 172                         flags |= (IPSET_FLAG_NOMATCH << 16);
 173         }
 174
 175         if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
 176                 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
 177                 ret = adtfn(set, &e, &ext, &ext, flags);
 178                 return ip_set_enomatch(ret, flags, adt, set) ? -ret:
 179                        ip_set_eexist(ret, flags) ? 0 : ret;
 180         }
 181
 182         ip_to = ip;
 183         if (tb[IPSET_ATTR_IP_TO]) {
 184                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 185                 if (ret)
 186                         return ret;
 187                 if (ip_to < ip)
 188                         swap(ip, ip_to);
 189                 if (ip + UINT_MAX == ip_to)
 190                         return -IPSET_ERR_HASH_RANGE;
 191         }
 192         if (retried)
 193                 ip = ntohl(h->next.ip);
 194         while (!after(ip, ip_to)) {
 195                 e.ip = htonl(ip);
 196                 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
 197                 ret = adtfn(set, &e, &ext, &ext, flags);
 198                 if (ret && !ip_set_eexist(ret, flags))
 199                         return ret;
 200                 else
 201                         ret = 0;
 202                 ip = last + 1;
 203         }
 204         return ret;
 205 }
 206
 207 /* IPv6 variant */
 208
 209 struct hash_net6_elem {
 210         union nf_inet_addr ip;
 211         u16 padding0;
 212         u8 nomatch;
 213         u8 cidr;
 214 };
 215
 216 /* Common functions */
 217
 218 static inline bool
 219 hash_net6_data_equal(const struct hash_net6_elem *ip1,
 220                      const struct hash_net6_elem *ip2,
 221                      u32 *multi)
 222 {
 223         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 224                ip1->cidr == ip2->cidr;
 225 }
 226
 227 static inline int
 228 hash_net6_do_data_match(const struct hash_net6_elem *elem)
 229 {
 230         return elem->nomatch ? -ENOTEMPTY : 1;
 231 }
 232
 233 static inline void
 234 hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags)
 235 {
 236         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
 237 }
 238
 239 static inline void
 240 hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags)
 241 {
 242         swap(*flags, elem->nomatch);
 243 }
 244
 245 static inline void
 246 hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
 247 {
 248         ip6_netmask(&elem->ip, cidr);
 249         elem->cidr = cidr;
 250 }
 251
 252 static bool
 253 hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
 254 {
 255         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 256
 257         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 258             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
 259             (flags &&
 260              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 261                 goto nla_put_failure;
 262         return 0;
 263
 264 nla_put_failure:
 265         return 1;
 266 }
 267
 268 static inline void
 269 hash_net6_data_next(struct hash_net4_elem *next,
 270                     const struct hash_net6_elem *d)
 271 {
 272 }
 273
 274 #undef MTYPE
 275 #undef PF
 276 #undef HOST_MASK
 277
 278 #define MTYPE           hash_net6
 279 #define PF              6
 280 #define HOST_MASK       128
 281 #define IP_SET_EMIT_CREATE
 282 #include "ip_set_hash_gen.h"
 283
 284 static int
 285 hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
 286                const struct xt_action_param *par,
 287                enum ipset_adt adt, struct ip_set_adt_opt *opt)
 288 {
 289         const struct hash_net *h = set->data;
 290         ipset_adtfn adtfn = set->variant->adt[adt];
 291         struct hash_net6_elem e = {
 292                 .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 293         };
 294         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 295
 296         if (e.cidr == 0)
 297                 return -EINVAL;
 298         if (adt == IPSET_TEST)
 299                 e.cidr = HOST_MASK;
 300
 301         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 302         ip6_netmask(&e.ip, e.cidr);
 303
 304         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 305 }
 306
 307 static int
 308 hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],
 309                enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 310 {
 311         ipset_adtfn adtfn = set->variant->adt[adt];
 312         struct hash_net6_elem e = { .cidr = HOST_MASK };
 313         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 314         int ret;
 315
 316         if (unlikely(!tb[IPSET_ATTR_IP] ||
 317                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 318                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
 319                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 320                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 321                 return -IPSET_ERR_PROTOCOL;
 322         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 323                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 324
 325         if (tb[IPSET_ATTR_LINENO])
 326                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 327
 328         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
 329               ip_set_get_extensions(set, tb, &ext);
 330         if (ret)
 331                 return ret;
 332
 333         if (tb[IPSET_ATTR_CIDR])
 334                 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 335
 336         if (!e.cidr || e.cidr > HOST_MASK)
 337                 return -IPSET_ERR_INVALID_CIDR;
 338
 339         ip6_netmask(&e.ip, e.cidr);
 340
 341         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 342                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 343                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 344                         flags |= (IPSET_FLAG_NOMATCH << 16);
 345         }
 346
 347         ret = adtfn(set, &e, &ext, &ext, flags);
 348
 349         return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 350                ip_set_eexist(ret, flags) ? 0 : ret;
 351 }
 352
 353 static struct ip_set_type hash_net_type __read_mostly = {
 354         .name           = "hash:net",
 355         .protocol       = IPSET_PROTOCOL,
 356         .features       = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
 357         .dimension      = IPSET_DIM_ONE,
 358         .family         = NFPROTO_UNSPEC,
 359         .revision_min   = IPSET_TYPE_REV_MIN,
 360         .revision_max   = IPSET_TYPE_REV_MAX,
 361         .create         = hash_net_create,
 362         .create_policy  = {
 363                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 364                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 365                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 366                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 367                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 368                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 369         },
 370         .adt_policy     = {
 371                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 372                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 373                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 374                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 375                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 376                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 377                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 378                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
 379         },
 380         .me             = THIS_MODULE,
 381 };
 382
 383 static int __init
 384 hash_net_init(void)
 385 {
 386         return ip_set_type_register(&hash_net_type);
 387 }
 388
 389 static void __exit
 390 hash_net_fini(void)
 391 {
 392         ip_set_type_unregister(&hash_net_type);
 393 }
 394
 395 module_init(hash_net_init);
 396 module_exit(hash_net_fini);