net/netfilter/ipset/ip_set_hash_net.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
   3  */
   4
   5 /* Kernel module implementing an IP set type: the hash:net type */
   6
   7 #include <linux/jhash.h>
   8 #include <linux/module.h>
   9 #include <linux/ip.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/errno.h>
  12 #include <linux/random.h>
  13 #include <net/ip.h>
  14 #include <net/ipv6.h>
  15 #include <net/netlink.h>
  16
  17 #include <linux/netfilter.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    Range as input support for IPv4 added */
  24 /*                              2    nomatch flag support added */
  25 /*                              3    Counters support added */
  26 /*                              4    Comments support added */
  27 /*                              5    Forceadd support added */
  28 #define IPSET_TYPE_REV_MAX      6 /* skbinfo mapping support added */
  29
  30 MODULE_LICENSE("GPL");
  31 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  32 IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  33 MODULE_ALIAS("ip_set_hash:net");
  34
  35 /* Type specific function prefix */
  36 #define HTYPE           hash_net
  37 #define IP_SET_HASH_WITH_NETS
  38
  39 /* IPv4 variant */
  40
  41 /* Member elements  */
  42 struct hash_net4_elem {
  43         __be32 ip;
  44         u16 padding0;
  45         u8 nomatch;
  46         u8 cidr;
  47 };
  48
  49 /* Common functions */
  50
  51 static inline bool
  52 hash_net4_data_equal(const struct hash_net4_elem *ip1,
  53                      const struct hash_net4_elem *ip2,
  54                      u32 *multi)
  55 {
  56         return ip1->ip == ip2->ip &&
  57                ip1->cidr == ip2->cidr;
  58 }
  59
  60 static inline int
  61 hash_net4_do_data_match(const struct hash_net4_elem *elem)
  62 {
  63         return elem->nomatch ? -ENOTEMPTY : 1;
  64 }
  65
  66 static inline void
  67 hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags)
  68 {
  69         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
  70 }
  71
  72 static inline void
  73 hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags)
  74 {
  75         swap(*flags, elem->nomatch);
  76 }
  77
  78 static inline void
  79 hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
  80 {
  81         elem->ip &= ip_set_netmask(cidr);
  82         elem->cidr = cidr;
  83 }
  84
  85 static bool
  86 hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
  87 {
  88         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
  89
  90         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  91             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
  92             (flags &&
  93              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
  94                 goto nla_put_failure;
  95         return false;
  96
  97 nla_put_failure:
  98         return true;
  99 }
 100
 101 static inline void
 102 hash_net4_data_next(struct hash_net4_elem *next,
 103                     const struct hash_net4_elem *d)
 104 {
 105         next->ip = d->ip;
 106 }
 107
 108 #define MTYPE           hash_net4
 109 #define HOST_MASK       32
 110 #include "ip_set_hash_gen.h"
 111
 112 static int
 113 hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
 114                const struct xt_action_param *par,
 115                enum ipset_adt adt, struct ip_set_adt_opt *opt)
 116 {
 117         const struct hash_net4 *h = set->data;
 118         ipset_adtfn adtfn = set->variant->adt[adt];
 119         struct hash_net4_elem e = {
 120                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 121         };
 122         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 123
 124         if (e.cidr == 0)
 125                 return -EINVAL;
 126         if (adt == IPSET_TEST)
 127                 e.cidr = HOST_MASK;
 128
 129         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 130         e.ip &= ip_set_netmask(e.cidr);
 131
 132         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 133 }
 134
 135 static int
 136 hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
 137                enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 138 {
 139         const struct hash_net4 *h = set->data;
 140         ipset_adtfn adtfn = set->variant->adt[adt];
 141         struct hash_net4_elem e = { .cidr = HOST_MASK };
 142         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 143         u32 ip = 0, ip_to = 0;
 144         int ret;
 145
 146         if (tb[IPSET_ATTR_LINENO])
 147                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 148
 149         if (unlikely(!tb[IPSET_ATTR_IP] ||
 150                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 151                 return -IPSET_ERR_PROTOCOL;
 152
 153         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
 154         if (ret)
 155                 return ret;
 156
 157         ret = ip_set_get_extensions(set, tb, &ext);
 158         if (ret)
 159                 return ret;
 160
 161         if (tb[IPSET_ATTR_CIDR]) {
 162                 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 163                 if (!e.cidr || e.cidr > HOST_MASK)
 164                         return -IPSET_ERR_INVALID_CIDR;
 165         }
 166
 167         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 168                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 169
 170                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 171                         flags |= (IPSET_FLAG_NOMATCH << 16);
 172         }
 173
 174         if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
 175                 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
 176                 ret = adtfn(set, &e, &ext, &ext, flags);
 177                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 178                        ip_set_eexist(ret, flags) ? 0 : ret;
 179         }
 180
 181         ip_to = ip;
 182         if (tb[IPSET_ATTR_IP_TO]) {
 183                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 184                 if (ret)
 185                         return ret;
 186                 if (ip_to < ip)
 187                         swap(ip, ip_to);
 188                 if (ip + UINT_MAX == ip_to)
 189                         return -IPSET_ERR_HASH_RANGE;
 190         }
 191         if (retried)
 192                 ip = ntohl(h->next.ip);
 193         do {
 194                 e.ip = htonl(ip);
 195                 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
 196                 ret = adtfn(set, &e, &ext, &ext, flags);
 197                 if (ret && !ip_set_eexist(ret, flags))
 198                         return ret;
 199
 200                 ret = 0;
 201         } while (ip++ < ip_to);
 202         return ret;
 203 }
 204
 205 /* IPv6 variant */
 206
 207 struct hash_net6_elem {
 208         union nf_inet_addr ip;
 209         u16 padding0;
 210         u8 nomatch;
 211         u8 cidr;
 212 };
 213
 214 /* Common functions */
 215
 216 static inline bool
 217 hash_net6_data_equal(const struct hash_net6_elem *ip1,
 218                      const struct hash_net6_elem *ip2,
 219                      u32 *multi)
 220 {
 221         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 222                ip1->cidr == ip2->cidr;
 223 }
 224
 225 static inline int
 226 hash_net6_do_data_match(const struct hash_net6_elem *elem)
 227 {
 228         return elem->nomatch ? -ENOTEMPTY : 1;
 229 }
 230
 231 static inline void
 232 hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags)
 233 {
 234         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
 235 }
 236
 237 static inline void
 238 hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags)
 239 {
 240         swap(*flags, elem->nomatch);
 241 }
 242
 243 static inline void
 244 hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
 245 {
 246         ip6_netmask(&elem->ip, cidr);
 247         elem->cidr = cidr;
 248 }
 249
 250 static bool
 251 hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
 252 {
 253         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
 254
 255         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 256             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
 257             (flags &&
 258              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
 259                 goto nla_put_failure;
 260         return false;
 261
 262 nla_put_failure:
 263         return true;
 264 }
 265
 266 static inline void
 267 hash_net6_data_next(struct hash_net6_elem *next,
 268                     const struct hash_net6_elem *d)
 269 {
 270 }
 271
 272 #undef MTYPE
 273 #undef HOST_MASK
 274
 275 #define MTYPE           hash_net6
 276 #define HOST_MASK       128
 277 #define IP_SET_EMIT_CREATE
 278 #include "ip_set_hash_gen.h"
 279
 280 static int
 281 hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
 282                const struct xt_action_param *par,
 283                enum ipset_adt adt, struct ip_set_adt_opt *opt)
 284 {
 285         const struct hash_net6 *h = set->data;
 286         ipset_adtfn adtfn = set->variant->adt[adt];
 287         struct hash_net6_elem e = {
 288                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
 289         };
 290         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 291
 292         if (e.cidr == 0)
 293                 return -EINVAL;
 294         if (adt == IPSET_TEST)
 295                 e.cidr = HOST_MASK;
 296
 297         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 298         ip6_netmask(&e.ip, e.cidr);
 299
 300         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 301 }
 302
 303 static int
 304 hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],
 305                enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 306 {
 307         ipset_adtfn adtfn = set->variant->adt[adt];
 308         struct hash_net6_elem e = { .cidr = HOST_MASK };
 309         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 310         int ret;
 311
 312         if (tb[IPSET_ATTR_LINENO])
 313                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 314
 315         if (unlikely(!tb[IPSET_ATTR_IP] ||
 316                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 317                 return -IPSET_ERR_PROTOCOL;
 318         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 319                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 320
 321         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 322         if (ret)
 323                 return ret;
 324
 325         ret = ip_set_get_extensions(set, tb, &ext);
 326         if (ret)
 327                 return ret;
 328
 329         if (tb[IPSET_ATTR_CIDR]) {
 330                 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 331                 if (!e.cidr || e.cidr > HOST_MASK)
 332                         return -IPSET_ERR_INVALID_CIDR;
 333         }
 334
 335         ip6_netmask(&e.ip, e.cidr);
 336
 337         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 338                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 339
 340                 if (cadt_flags & IPSET_FLAG_NOMATCH)
 341                         flags |= (IPSET_FLAG_NOMATCH << 16);
 342         }
 343
 344         ret = adtfn(set, &e, &ext, &ext, flags);
 345
 346         return ip_set_enomatch(ret, flags, adt, set) ? -ret :
 347                ip_set_eexist(ret, flags) ? 0 : ret;
 348 }
 349
 350 static struct ip_set_type hash_net_type __read_mostly = {
 351         .name           = "hash:net",
 352         .protocol       = IPSET_PROTOCOL,
 353         .features       = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
 354         .dimension      = IPSET_DIM_ONE,
 355         .family         = NFPROTO_UNSPEC,
 356         .revision_min   = IPSET_TYPE_REV_MIN,
 357         .revision_max   = IPSET_TYPE_REV_MAX,
 358         .create         = hash_net_create,
 359         .create_policy  = {
 360                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 361                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 362                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 363                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 364                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 365                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 366         },
 367         .adt_policy     = {
 368                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 369                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 370                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 371                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 372                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 373                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 374                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 375                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 376                                             .len  = IPSET_MAX_COMMENT_SIZE },
 377                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 378                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 379                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 380         },
 381         .me             = THIS_MODULE,
 382 };
 383
 384 static int __init
 385 hash_net_init(void)
 386 {
 387         return ip_set_type_register(&hash_net_type);
 388 }
 389
 390 static void __exit
 391 hash_net_fini(void)
 392 {
 393         rcu_barrier();
 394         ip_set_type_unregister(&hash_net_type);
 395 }
 396
 397 module_init(hash_net_init);
 398 module_exit(hash_net_fini);