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 /*                              3          Forceadd support */
  30 #define IPSET_TYPE_REV_MAX      4       /* skbinfo support  */
  31
  32 MODULE_LICENSE("GPL");
  33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  34 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  35 MODULE_ALIAS("ip_set_hash:ip");
  36
  37 /* Type specific function prefix */
  38 #define HTYPE           hash_ip
  39 #define IP_SET_HASH_WITH_NETMASK
  40
  41 /* IPv4 variant */
  42
  43 /* Member elements */
  44 struct hash_ip4_elem {
  45         /* Zero valued IP addresses cannot be stored */
  46         __be32 ip;
  47 };
  48
  49 /* Common functions */
  50
  51 static inline bool
  52 hash_ip4_data_equal(const struct hash_ip4_elem *e1,
  53                     const struct hash_ip4_elem *e2,
  54                     u32 *multi)
  55 {
  56         return e1->ip == e2->ip;
  57 }
  58
  59 static bool
  60 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
  61 {
  62         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
  63                 goto nla_put_failure;
  64         return false;
  65
  66 nla_put_failure:
  67         return true;
  68 }
  69
  70 static inline void
  71 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
  72 {
  73         next->ip = e->ip;
  74 }
  75
  76 #define MTYPE           hash_ip4
  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 = { 0 };
  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 = { 0 };
 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 (tb[IPSET_ATTR_LINENO])
 112                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 113
 114         if (unlikely(!tb[IPSET_ATTR_IP]))
 115                 return -IPSET_ERR_PROTOCOL;
 116
 117         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
 118         if (ret)
 119                 return ret;
 120
 121         ret = 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 > HOST_MASK)
 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
 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 false;
 196
 197 nla_put_failure:
 198         return true;
 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 HOST_MASK
 208
 209 #define MTYPE           hash_ip6
 210 #define HOST_MASK       128
 211
 212 #define IP_SET_EMIT_CREATE
 213 #include "ip_set_hash_gen.h"
 214
 215 static int
 216 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 217               const struct xt_action_param *par,
 218               enum ipset_adt adt, struct ip_set_adt_opt *opt)
 219 {
 220         const struct hash_ip *h = set->data;
 221         ipset_adtfn adtfn = set->variant->adt[adt];
 222         struct hash_ip6_elem e = { { .all = { 0 } } };
 223         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 224
 225         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 226         hash_ip6_netmask(&e.ip, h->netmask);
 227         if (ipv6_addr_any(&e.ip.in6))
 228                 return -EINVAL;
 229
 230         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 231 }
 232
 233 static int
 234 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
 235               enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 236 {
 237         const struct hash_ip *h = set->data;
 238         ipset_adtfn adtfn = set->variant->adt[adt];
 239         struct hash_ip6_elem e = { { .all = { 0 } } };
 240         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 241         int ret;
 242
 243         if (tb[IPSET_ATTR_LINENO])
 244                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 245
 246         if (unlikely(!tb[IPSET_ATTR_IP]))
 247                 return -IPSET_ERR_PROTOCOL;
 248         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 249                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 250         if (unlikely(tb[IPSET_ATTR_CIDR])) {
 251                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 252
 253                 if (cidr != HOST_MASK)
 254                         return -IPSET_ERR_INVALID_CIDR;
 255         }
 256
 257         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 258         if (ret)
 259                 return ret;
 260
 261         ret = ip_set_get_extensions(set, tb, &ext);
 262         if (ret)
 263                 return ret;
 264
 265         hash_ip6_netmask(&e.ip, h->netmask);
 266         if (ipv6_addr_any(&e.ip.in6))
 267                 return -IPSET_ERR_HASH_ELEM;
 268
 269         ret = adtfn(set, &e, &ext, &ext, flags);
 270
 271         return ip_set_eexist(ret, flags) ? 0 : ret;
 272 }
 273
 274 static struct ip_set_type hash_ip_type __read_mostly = {
 275         .name           = "hash:ip",
 276         .protocol       = IPSET_PROTOCOL,
 277         .features       = IPSET_TYPE_IP,
 278         .dimension      = IPSET_DIM_ONE,
 279         .family         = NFPROTO_UNSPEC,
 280         .revision_min   = IPSET_TYPE_REV_MIN,
 281         .revision_max   = IPSET_TYPE_REV_MAX,
 282         .create         = hash_ip_create,
 283         .create_policy  = {
 284                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 285                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 286                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 287                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 288                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 289                 [IPSET_ATTR_NETMASK]    = { .type = NLA_U8  },
 290                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 291         },
 292         .adt_policy     = {
 293                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 294                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 295                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 296                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 297                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 298                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 299                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 300                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 301                                             .len  = IPSET_MAX_COMMENT_SIZE },
 302                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 303                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 304                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 305         },
 306         .me             = THIS_MODULE,
 307 };
 308
 309 static int __init
 310 hash_ip_init(void)
 311 {
 312         return ip_set_type_register(&hash_ip_type);
 313 }
 314
 315 static void __exit
 316 hash_ip_fini(void)
 317 {
 318         rcu_barrier();
 319         ip_set_type_unregister(&hash_ip_type);
 320 }
 321
 322 module_init(hash_ip_init);
 323 module_exit(hash_ip_fini);