net/netfilter/ipset/ip_set_hash_ip.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:ip 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 #include <net/tcp.h>
  20
  21 #include <linux/netfilter.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          Counters support */
  28 /*                              2          Comments support */
  29 #define IPSET_TYPE_REV_MAX      3       /* Forceadd support */
  30
  31 MODULE_LICENSE("GPL");
  32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  33 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  34 MODULE_ALIAS("ip_set_hash:ip");
  35
  36 /* Type specific function prefix */
  37 #define HTYPE           hash_ip
  38 #define IP_SET_HASH_WITH_NETMASK
  39
  40 /* IPv4 variant */
  41
  42 /* Member elements */
  43 struct hash_ip4_elem {
  44         /* Zero valued IP addresses cannot be stored */
  45         __be32 ip;
  46 };
  47
  48 /* Common functions */
  49
  50 static inline bool
  51 hash_ip4_data_equal(const struct hash_ip4_elem *e1,
  52                     const struct hash_ip4_elem *e2,
  53                     u32 *multi)
  54 {
  55         return e1->ip == e2->ip;
  56 }
  57
  58 static inline bool
  59 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
  60 {
  61         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
  62                 goto nla_put_failure;
  63         return 0;
  64
  65 nla_put_failure:
  66         return 1;
  67 }
  68
  69 static inline void
  70 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
  71 {
  72         next->ip = e->ip;
  73 }
  74
  75 #define MTYPE           hash_ip4
  76 #define PF              4
  77 #define HOST_MASK       32
  78 #include "ip_set_hash_gen.h"
  79
  80 static int
  81 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
  82               const struct xt_action_param *par,
  83               enum ipset_adt adt, struct ip_set_adt_opt *opt)
  84 {
  85         const struct hash_ip *h = set->data;
  86         ipset_adtfn adtfn = set->variant->adt[adt];
  87         struct hash_ip4_elem e = {};
  88         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
  89         __be32 ip;
  90
  91         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
  92         ip &= ip_set_netmask(h->netmask);
  93         if (ip == 0)
  94                 return -EINVAL;
  95
  96         e.ip = ip;
  97         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
  98 }
  99
 100 static int
 101 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
 102               enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 103 {
 104         const struct hash_ip *h = set->data;
 105         ipset_adtfn adtfn = set->variant->adt[adt];
 106         struct hash_ip4_elem e = {};
 107         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 108         u32 ip = 0, ip_to = 0, hosts;
 109         int ret = 0;
 110
 111         if (unlikely(!tb[IPSET_ATTR_IP] ||
 112                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 113                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 114                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 115                 return -IPSET_ERR_PROTOCOL;
 116
 117         if (tb[IPSET_ATTR_LINENO])
 118                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 119
 120         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
 121               ip_set_get_extensions(set, tb, &ext);
 122         if (ret)
 123                 return ret;
 124
 125         ip &= ip_set_hostmask(h->netmask);
 126
 127         if (adt == IPSET_TEST) {
 128                 e.ip = htonl(ip);
 129                 if (e.ip == 0)
 130                         return -IPSET_ERR_HASH_ELEM;
 131                 return adtfn(set, &e, &ext, &ext, flags);
 132         }
 133
 134         ip_to = ip;
 135         if (tb[IPSET_ATTR_IP_TO]) {
 136                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 137                 if (ret)
 138                         return ret;
 139                 if (ip > ip_to)
 140                         swap(ip, ip_to);
 141         } else if (tb[IPSET_ATTR_CIDR]) {
 142                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 143
 144                 if (!cidr || cidr > 32)
 145                         return -IPSET_ERR_INVALID_CIDR;
 146                 ip_set_mask_from_to(ip, ip_to, cidr);
 147         }
 148
 149         hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
 150
 151         if (retried)
 152                 ip = ntohl(h->next.ip);
 153         for (; !before(ip_to, ip); ip += hosts) {
 154                 e.ip = htonl(ip);
 155                 if (e.ip == 0)
 156                         return -IPSET_ERR_HASH_ELEM;
 157                 ret = adtfn(set, &e, &ext, &ext, flags);
 158
 159                 if (ret && !ip_set_eexist(ret, flags))
 160                         return ret;
 161                 else
 162                         ret = 0;
 163         }
 164         return ret;
 165 }
 166
 167 /* IPv6 variant */
 168
 169 /* Member elements */
 170 struct hash_ip6_elem {
 171         union nf_inet_addr ip;
 172 };
 173
 174 /* Common functions */
 175
 176 static inline bool
 177 hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
 178                     const struct hash_ip6_elem *ip2,
 179                     u32 *multi)
 180 {
 181         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6);
 182 }
 183
 184 static inline void
 185 hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
 186 {
 187         ip6_netmask(ip, prefix);
 188 }
 189
 190 static bool
 191 hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e)
 192 {
 193         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
 194                 goto nla_put_failure;
 195         return 0;
 196
 197 nla_put_failure:
 198         return 1;
 199 }
 200
 201 static inline void
 202 hash_ip6_data_next(struct hash_ip4_elem *next, const struct hash_ip6_elem *e)
 203 {
 204 }
 205
 206 #undef MTYPE
 207 #undef PF
 208 #undef HOST_MASK
 209 #undef HKEY_DATALEN
 210
 211 #define MTYPE           hash_ip6
 212 #define PF              6
 213 #define HOST_MASK       128
 214
 215 #define IP_SET_EMIT_CREATE
 216 #include "ip_set_hash_gen.h"
 217
 218 static int
 219 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 220               const struct xt_action_param *par,
 221               enum ipset_adt adt, struct ip_set_adt_opt *opt)
 222 {
 223         const struct hash_ip *h = set->data;
 224         ipset_adtfn adtfn = set->variant->adt[adt];
 225         struct hash_ip6_elem e = {};
 226         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 227
 228         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 229         hash_ip6_netmask(&e.ip, h->netmask);
 230         if (ipv6_addr_any(&e.ip.in6))
 231                 return -EINVAL;
 232
 233         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 234 }
 235
 236 static int
 237 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
 238               enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 239 {
 240         const struct hash_ip *h = set->data;
 241         ipset_adtfn adtfn = set->variant->adt[adt];
 242         struct hash_ip6_elem e = {};
 243         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 244         int ret;
 245
 246         if (unlikely(!tb[IPSET_ATTR_IP] ||
 247                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 248                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 249                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
 250                      tb[IPSET_ATTR_IP_TO] ||
 251                      tb[IPSET_ATTR_CIDR]))
 252                 return -IPSET_ERR_PROTOCOL;
 253
 254         if (tb[IPSET_ATTR_LINENO])
 255                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 256
 257         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
 258               ip_set_get_extensions(set, tb, &ext);
 259         if (ret)
 260                 return ret;
 261
 262         hash_ip6_netmask(&e.ip, h->netmask);
 263         if (ipv6_addr_any(&e.ip.in6))
 264                 return -IPSET_ERR_HASH_ELEM;
 265
 266         ret = adtfn(set, &e, &ext, &ext, flags);
 267
 268         return ip_set_eexist(ret, flags) ? 0 : ret;
 269 }
 270
 271 static struct ip_set_type hash_ip_type __read_mostly = {
 272         .name           = "hash:ip",
 273         .protocol       = IPSET_PROTOCOL,
 274         .features       = IPSET_TYPE_IP,
 275         .dimension      = IPSET_DIM_ONE,
 276         .family         = NFPROTO_UNSPEC,
 277         .revision_min   = IPSET_TYPE_REV_MIN,
 278         .revision_max   = IPSET_TYPE_REV_MAX,
 279         .create         = hash_ip_create,
 280         .create_policy  = {
 281                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 282                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 283                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 284                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 285                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 286                 [IPSET_ATTR_NETMASK]    = { .type = NLA_U8  },
 287                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 288         },
 289         .adt_policy     = {
 290                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 291                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 292                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 293                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 294                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 295                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 296                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 297                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
 298         },
 299         .me             = THIS_MODULE,
 300 };
 301
 302 static int __init
 303 hash_ip_init(void)
 304 {
 305         return ip_set_type_register(&hash_ip_type);
 306 }
 307
 308 static void __exit
 309 hash_ip_fini(void)
 310 {
 311         ip_set_type_unregister(&hash_ip_type);
 312 }
 313
 314 module_init(hash_ip_init);
 315 module_exit(hash_ip_fini);