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 /*                              4    Comments support added */
  30 /*                              5    Forceadd support added */
  31 #define IPSET_TYPE_REV_MAX      6 /* skbinfo mapping support added */
  32
  33 MODULE_LICENSE("GPL");
  34 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  35 IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  36 MODULE_ALIAS("ip_set_hash:net");
  37
  38 /* Type specific function prefix */
  39 #define HTYPE           hash_net
  40 #define IP_SET_HASH_WITH_NETS
  41
  42 /* IPv4 variant */
  43
  44 /* Member elements  */
  45 struct hash_net4_elem {
  46         __be32 ip;
  47         u16 padding0;
  48         u8 nomatch;
  49         u8 cidr;
  50 };
  51
  52 /* Common functions */
  53
  54 static inline bool
  55 hash_net4_data_equal(const struct hash_net4_elem *ip1,
  56                      const struct hash_net4_elem *ip2,
  57                      u32 *multi)
  58 {
  59         return ip1->ip == ip2->ip &&
  60                ip1->cidr == ip2->cidr;
  61 }
  62
  63 static inline int
  64 hash_net4_do_data_match(const struct hash_net4_elem *elem)
  65 {
  66         return elem->nomatch ? -ENOTEMPTY : 1;
  67 }
  68
  69 static inline void
  70 hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags)
  71 {
  72         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
  73 }
  74
  75 static inline void
  76 hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags)
  77 {
  78         swap(*flags, elem->nomatch);
  79 }
  80
  81 static inline void
  82 hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
  83 {
  84         elem->ip &= ip_set_netmask(cidr);
  85         elem->cidr = cidr;
  86 }
  87
  88 static bool
  89 hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
  90 {
  91         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
  92
  93         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  94             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
  95             (flags &&
  96              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
  97                 goto nla_put_failure;
  98         return false;
  99
 100 nla_put_failure:
 101         return true;
 102 }
 103
 104 static inline void
 105 hash_net4_data_next(struct hash_net4_elem *next,
 106                     const struct hash_net4_elem *d)
 107 {
 108         next->ip = d->ip;
 109 }
 110
 111 #define MTYPE           hash_net4
 112 #define HOST_MASK       32
 113 #include "ip_set_hash_gen.h"
 114
 115 static int
 116 hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
 117                const struct xt_action_param *par,
 118                enum ipset_adt adt, struct ip_set_adt_opt *opt)
 119 {
 120         const struct hash_net4 *h = set->data;
 121         ipset_adtfn adtfn = set->variant->adt[adt];
 122         struct hash_net4_elem e = {
 123                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 124         };
 125         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 126
 127         if (e.cidr == 0)
 128                 return -EINVAL;
 129         if (adt == IPSET_TEST)
 130                 e.cidr = HOST_MASK;
 131
 132         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 133         e.ip &= ip_set_netmask(e.cidr);
 134
 135         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 136 }
 137
 138 static int
 139 hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
 140                enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 141 {
 142         const struct hash_net4 *h = set->data;
 143         ipset_adtfn adtfn = set->variant->adt[adt];
 144         struct hash_net4_elem e = { .cidr = HOST_MASK };
 145         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 146         u32 ip = 0, ip_to = 0, last;
 147         int ret;
 148
 149         if (tb[IPSET_ATTR_LINENO])
 150                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 151
 152         if (unlikely(!tb[IPSET_ATTR_IP] ||
 153                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 154                 return -IPSET_ERR_PROTOCOL;
 155
 156         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
 157         if (ret)
 158                 return ret;
 159
 160         ret = ip_set_get_extensions(set, tb, &ext);
 161         if (ret)
 162                 return ret;
 163
 164         if (tb[IPSET_ATTR_CIDR]) {
 165                 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 166                 if (!e.cidr || e.cidr > HOST_MASK)
 167                         return -IPSET_ERR_INVALID_CIDR;
 168         }
 169
 170         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 171                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 172
 173                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 174                         flags |= (IPSET_FLAG_NOMATCH << 16);
 175         }
 176
 177         if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
 178                 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
 179                 ret = adtfn(set, &e, &ext, &ext, flags);
 180                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 181                        ip_set_eexist(ret, flags) ? 0 : ret;
 182         }
 183
 184         ip_to = ip;
 185         if (tb[IPSET_ATTR_IP_TO]) {
 186                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 187                 if (ret)
 188                         return ret;
 189                 if (ip_to < ip)
 190                         swap(ip, ip_to);
 191                 if (ip + UINT_MAX == ip_to)
 192                         return -IPSET_ERR_HASH_RANGE;
 193         }
 194         if (retried)
 195                 ip = ntohl(h->next.ip);
 196         while (!after(ip, ip_to)) {
 197                 e.ip = htonl(ip);
 198                 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
 199                 ret = adtfn(set, &e, &ext, &ext, flags);
 200                 if (ret && !ip_set_eexist(ret, flags))
 201                         return ret;
 202
 203                 ret = 0;
 204                 ip = last + 1;
 205         }
 206         return ret;
 207 }
 208
 209 /* IPv6 variant */
 210
 211 struct hash_net6_elem {
 212         union nf_inet_addr ip;
 213         u16 padding0;
 214         u8 nomatch;
 215         u8 cidr;
 216 };
 217
 218 /* Common functions */
 219
 220 static inline bool
 221 hash_net6_data_equal(const struct hash_net6_elem *ip1,
 222                      const struct hash_net6_elem *ip2,
 223                      u32 *multi)
 224 {
 225         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 226                ip1->cidr == ip2->cidr;
 227 }
 228
 229 static inline int
 230 hash_net6_do_data_match(const struct hash_net6_elem *elem)
 231 {
 232         return elem->nomatch ? -ENOTEMPTY : 1;
 233 }
 234
 235 static inline void
 236 hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags)
 237 {
 238         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
 239 }
 240
 241 static inline void
 242 hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags)
 243 {
 244         swap(*flags, elem->nomatch);
 245 }
 246
 247 static inline void
 248 hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
 249 {
 250         ip6_netmask(&elem->ip, cidr);
 251         elem->cidr = cidr;
 252 }
 253
 254 static bool
 255 hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
 256 {
 257         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 258
 259         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 260             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
 261             (flags &&
 262              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 263                 goto nla_put_failure;
 264         return false;
 265
 266 nla_put_failure:
 267         return true;
 268 }
 269
 270 static inline void
 271 hash_net6_data_next(struct hash_net6_elem *next,
 272                     const struct hash_net6_elem *d)
 273 {
 274 }
 275
 276 #undef MTYPE
 277 #undef HOST_MASK
 278
 279 #define MTYPE           hash_net6
 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_net6 *h = set->data;
 290         ipset_adtfn adtfn = set->variant->adt[adt];
 291         struct hash_net6_elem e = {
 292                 .cidr = 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 (tb[IPSET_ATTR_LINENO])
 317                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 318
 319         if (unlikely(!tb[IPSET_ATTR_IP] ||
 320                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 321                 return -IPSET_ERR_PROTOCOL;
 322         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 323                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 324
 325         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 326         if (ret)
 327                 return ret;
 328
 329         ret = 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                 if (!e.cidr || e.cidr > HOST_MASK)
 336                         return -IPSET_ERR_INVALID_CIDR;
 337         }
 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
 344                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 345                         flags |= (IPSET_FLAG_NOMATCH << 16);
 346         }
 347
 348         ret = adtfn(set, &e, &ext, &ext, flags);
 349
 350         return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 351                ip_set_eexist(ret, flags) ? 0 : ret;
 352 }
 353
 354 static struct ip_set_type hash_net_type __read_mostly = {
 355         .name           = "hash:net",
 356         .protocol       = IPSET_PROTOCOL,
 357         .features       = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
 358         .dimension      = IPSET_DIM_ONE,
 359         .family         = NFPROTO_UNSPEC,
 360         .revision_min   = IPSET_TYPE_REV_MIN,
 361         .revision_max   = IPSET_TYPE_REV_MAX,
 362         .create         = hash_net_create,
 363         .create_policy  = {
 364                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 365                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 366                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 367                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 368                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 369                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 370         },
 371         .adt_policy     = {
 372                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 373                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 374                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 375                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 376                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 377                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 378                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 379                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 380                                             .len  = IPSET_MAX_COMMENT_SIZE },
 381                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 382                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 383                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 384         },
 385         .me             = THIS_MODULE,
 386 };
 387
 388 static int __init
 389 hash_net_init(void)
 390 {
 391         return ip_set_type_register(&hash_net_type);
 392 }
 393
 394 static void __exit
 395 hash_net_fini(void)
 396 {
 397         rcu_barrier();
 398         ip_set_type_unregister(&hash_net_type);
 399 }
 400
 401 module_init(hash_net_init);
 402 module_exit(hash_net_fini);