net/netfilter/ipset/ip_set_hash_ipportip.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,port,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_getport.h>
  25 #include <linux/netfilter/ipset/ip_set_hash.h>
  26
  27 #define IPSET_TYPE_REV_MIN      0
  28 /*                              1    SCTP and UDPLITE support added */
  29 /*                              2    Counters support added */
  30 /*                              3    Comments support added */
  31 #define IPSET_TYPE_REV_MAX      4 /* Forceadd support added */
  32
  33 MODULE_LICENSE("GPL");
  34 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  35 IP_SET_MODULE_DESC("hash:ip,port,ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  36 MODULE_ALIAS("ip_set_hash:ip,port,ip");
  37
  38 /* Type specific function prefix */
  39 #define HTYPE           hash_ipportip
  40
  41 /* IPv4 variant */
  42
  43 /* Member elements  */
  44 struct hash_ipportip4_elem {
  45         __be32 ip;
  46         __be32 ip2;
  47         __be16 port;
  48         u8 proto;
  49         u8 padding;
  50 };
  51
  52 static inline bool
  53 hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
  54                           const struct hash_ipportip4_elem *ip2,
  55                           u32 *multi)
  56 {
  57         return ip1->ip == ip2->ip &&
  58                ip1->ip2 == ip2->ip2 &&
  59                ip1->port == ip2->port &&
  60                ip1->proto == ip2->proto;
  61 }
  62
  63 static bool
  64 hash_ipportip4_data_list(struct sk_buff *skb,
  65                        const struct hash_ipportip4_elem *data)
  66 {
  67         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  68             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
  69             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
  70             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
  71                 goto nla_put_failure;
  72         return 0;
  73
  74 nla_put_failure:
  75         return 1;
  76 }
  77
  78 static inline void
  79 hash_ipportip4_data_next(struct hash_ipportip4_elem *next,
  80                          const struct hash_ipportip4_elem *d)
  81 {
  82         next->ip = d->ip;
  83         next->port = d->port;
  84 }
  85
  86 /* Common functions */
  87 #define MTYPE           hash_ipportip4
  88 #define PF              4
  89 #define HOST_MASK       32
  90 #include "ip_set_hash_gen.h"
  91
  92 static int
  93 hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb,
  94                     const struct xt_action_param *par,
  95                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
  96 {
  97         ipset_adtfn adtfn = set->variant->adt[adt];
  98         struct hash_ipportip4_elem e = { };
  99         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 100
 101         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 102                                  &e.port, &e.proto))
 103                 return -EINVAL;
 104
 105         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 106         ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2);
 107         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 108 }
 109
 110 static int
 111 hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
 112                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 113 {
 114         const struct hash_ipportip *h = set->data;
 115         ipset_adtfn adtfn = set->variant->adt[adt];
 116         struct hash_ipportip4_elem e = { };
 117         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 118         u32 ip, ip_to = 0, p = 0, port, port_to;
 119         bool with_ports = false;
 120         int ret;
 121
 122         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 123                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 124                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 125                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 126                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 127                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 128                 return -IPSET_ERR_PROTOCOL;
 129
 130         if (tb[IPSET_ATTR_LINENO])
 131                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 132
 133         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
 134               ip_set_get_extensions(set, tb, &ext);
 135         if (ret)
 136                 return ret;
 137
 138         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP2], &e.ip2);
 139         if (ret)
 140                 return ret;
 141
 142         if (tb[IPSET_ATTR_PORT])
 143                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 144         else
 145                 return -IPSET_ERR_PROTOCOL;
 146
 147         if (tb[IPSET_ATTR_PROTO]) {
 148                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 149                 with_ports = ip_set_proto_with_ports(e.proto);
 150
 151                 if (e.proto == 0)
 152                         return -IPSET_ERR_INVALID_PROTO;
 153         } else
 154                 return -IPSET_ERR_MISSING_PROTO;
 155
 156         if (!(with_ports || e.proto == IPPROTO_ICMP))
 157                 e.port = 0;
 158
 159         if (adt == IPSET_TEST ||
 160             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
 161               tb[IPSET_ATTR_PORT_TO])) {
 162                 ret = adtfn(set, &e, &ext, &ext, flags);
 163                 return ip_set_eexist(ret, flags) ? 0 : ret;
 164         }
 165
 166         ip_to = ip = ntohl(e.ip);
 167         if (tb[IPSET_ATTR_IP_TO]) {
 168                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 169                 if (ret)
 170                         return ret;
 171                 if (ip > ip_to)
 172                         swap(ip, ip_to);
 173         } else if (tb[IPSET_ATTR_CIDR]) {
 174                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 175
 176                 if (!cidr || cidr > 32)
 177                         return -IPSET_ERR_INVALID_CIDR;
 178                 ip_set_mask_from_to(ip, ip_to, cidr);
 179         }
 180
 181         port_to = port = ntohs(e.port);
 182         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 183                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 184                 if (port > port_to)
 185                         swap(port, port_to);
 186         }
 187
 188         if (retried)
 189                 ip = ntohl(h->next.ip);
 190         for (; !before(ip_to, ip); ip++) {
 191                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 192                                                        : port;
 193                 for (; p <= port_to; p++) {
 194                         e.ip = htonl(ip);
 195                         e.port = htons(p);
 196                         ret = adtfn(set, &e, &ext, &ext, flags);
 197
 198                         if (ret && !ip_set_eexist(ret, flags))
 199                                 return ret;
 200                         else
 201                                 ret = 0;
 202                 }
 203         }
 204         return ret;
 205 }
 206
 207 /* IPv6 variant */
 208
 209 struct hash_ipportip6_elem {
 210         union nf_inet_addr ip;
 211         union nf_inet_addr ip2;
 212         __be16 port;
 213         u8 proto;
 214         u8 padding;
 215 };
 216
 217 /* Common functions */
 218
 219 static inline bool
 220 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
 221                           const struct hash_ipportip6_elem *ip2,
 222                           u32 *multi)
 223 {
 224         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 225                ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
 226                ip1->port == ip2->port &&
 227                ip1->proto == ip2->proto;
 228 }
 229
 230 static bool
 231 hash_ipportip6_data_list(struct sk_buff *skb,
 232                          const struct hash_ipportip6_elem *data)
 233 {
 234         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 235             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
 236             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 237             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 238                 goto nla_put_failure;
 239         return 0;
 240
 241 nla_put_failure:
 242         return 1;
 243 }
 244
 245 static inline void
 246 hash_ipportip6_data_next(struct hash_ipportip4_elem *next,
 247                          const struct hash_ipportip6_elem *d)
 248 {
 249         next->port = d->port;
 250 }
 251
 252 #undef MTYPE
 253 #undef PF
 254 #undef HOST_MASK
 255
 256 #define MTYPE           hash_ipportip6
 257 #define PF              6
 258 #define HOST_MASK       128
 259 #define IP_SET_EMIT_CREATE
 260 #include "ip_set_hash_gen.h"
 261
 262 static int
 263 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 264                     const struct xt_action_param *par,
 265                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
 266 {
 267         ipset_adtfn adtfn = set->variant->adt[adt];
 268         struct hash_ipportip6_elem e = { };
 269         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 270
 271         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 272                                  &e.port, &e.proto))
 273                 return -EINVAL;
 274
 275         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 276         ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
 277         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 278 }
 279
 280 static int
 281 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
 282                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 283 {
 284         const struct hash_ipportip *h = set->data;
 285         ipset_adtfn adtfn = set->variant->adt[adt];
 286         struct hash_ipportip6_elem e = { };
 287         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 288         u32 port, port_to;
 289         bool with_ports = false;
 290         int ret;
 291
 292         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 293                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 294                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 295                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 296                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 297                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
 298                      tb[IPSET_ATTR_IP_TO] ||
 299                      tb[IPSET_ATTR_CIDR]))
 300                 return -IPSET_ERR_PROTOCOL;
 301
 302         if (tb[IPSET_ATTR_LINENO])
 303                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 304
 305         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
 306               ip_set_get_extensions(set, tb, &ext);
 307         if (ret)
 308                 return ret;
 309
 310         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
 311         if (ret)
 312                 return ret;
 313
 314         if (tb[IPSET_ATTR_PORT])
 315                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 316         else
 317                 return -IPSET_ERR_PROTOCOL;
 318
 319         if (tb[IPSET_ATTR_PROTO]) {
 320                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 321                 with_ports = ip_set_proto_with_ports(e.proto);
 322
 323                 if (e.proto == 0)
 324                         return -IPSET_ERR_INVALID_PROTO;
 325         } else
 326                 return -IPSET_ERR_MISSING_PROTO;
 327
 328         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 329                 e.port = 0;
 330
 331         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 332                 ret = adtfn(set, &e, &ext, &ext, flags);
 333                 return ip_set_eexist(ret, flags) ? 0 : ret;
 334         }
 335
 336         port = ntohs(e.port);
 337         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 338         if (port > port_to)
 339                 swap(port, port_to);
 340
 341         if (retried)
 342                 port = ntohs(h->next.port);
 343         for (; port <= port_to; port++) {
 344                 e.port = htons(port);
 345                 ret = adtfn(set, &e, &ext, &ext, flags);
 346
 347                 if (ret && !ip_set_eexist(ret, flags))
 348                         return ret;
 349                 else
 350                         ret = 0;
 351         }
 352         return ret;
 353 }
 354
 355 static struct ip_set_type hash_ipportip_type __read_mostly = {
 356         .name           = "hash:ip,port,ip",
 357         .protocol       = IPSET_PROTOCOL,
 358         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
 359         .dimension      = IPSET_DIM_THREE,
 360         .family         = NFPROTO_UNSPEC,
 361         .revision_min   = IPSET_TYPE_REV_MIN,
 362         .revision_max   = IPSET_TYPE_REV_MAX,
 363         .create         = hash_ipportip_create,
 364         .create_policy  = {
 365                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 366                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 367                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 368                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 369                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 370                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 371         },
 372         .adt_policy     = {
 373                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 374                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 375                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
 376                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 377                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 378                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 379                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 380                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 381                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 382                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 383                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 384                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
 385         },
 386         .me             = THIS_MODULE,
 387 };
 388
 389 static int __init
 390 hash_ipportip_init(void)
 391 {
 392         return ip_set_type_register(&hash_ipportip_type);
 393 }
 394
 395 static void __exit
 396 hash_ipportip_fini(void)
 397 {
 398         ip_set_type_unregister(&hash_ipportip_type);
 399 }
 400
 401 module_init(hash_ipportip_init);
 402 module_exit(hash_ipportip_fini);