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 /*                              4    Forceadd support added */
  32 #define IPSET_TYPE_REV_MAX      5 /* skbinfo support added */
  33
  34 MODULE_LICENSE("GPL");
  35 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  36 IP_SET_MODULE_DESC("hash:ip,port,ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  37 MODULE_ALIAS("ip_set_hash:ip,port,ip");
  38
  39 /* Type specific function prefix */
  40 #define HTYPE           hash_ipportip
  41
  42 /* IPv4 variant */
  43
  44 /* Member elements  */
  45 struct hash_ipportip4_elem {
  46         __be32 ip;
  47         __be32 ip2;
  48         __be16 port;
  49         u8 proto;
  50         u8 padding;
  51 };
  52
  53 static inline bool
  54 hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
  55                           const struct hash_ipportip4_elem *ip2,
  56                           u32 *multi)
  57 {
  58         return ip1->ip == ip2->ip &&
  59                ip1->ip2 == ip2->ip2 &&
  60                ip1->port == ip2->port &&
  61                ip1->proto == ip2->proto;
  62 }
  63
  64 static bool
  65 hash_ipportip4_data_list(struct sk_buff *skb,
  66                          const struct hash_ipportip4_elem *data)
  67 {
  68         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  69             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
  70             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
  71             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
  72                 goto nla_put_failure;
  73         return false;
  74
  75 nla_put_failure:
  76         return true;
  77 }
  78
  79 static inline void
  80 hash_ipportip4_data_next(struct hash_ipportip4_elem *next,
  81                          const struct hash_ipportip4_elem *d)
  82 {
  83         next->ip = d->ip;
  84         next->port = d->port;
  85 }
  86
  87 /* Common functions */
  88 #define MTYPE           hash_ipportip4
  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 = { .ip = 0 };
  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 = { .ip = 0 };
 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 (tb[IPSET_ATTR_LINENO])
 123                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 124
 125         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 126                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 127                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
 128                 return -IPSET_ERR_PROTOCOL;
 129
 130         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
 131         if (ret)
 132                 return ret;
 133
 134         ret = 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         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 143
 144         if (tb[IPSET_ATTR_PROTO]) {
 145                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 146                 with_ports = ip_set_proto_with_ports(e.proto);
 147
 148                 if (e.proto == 0)
 149                         return -IPSET_ERR_INVALID_PROTO;
 150         } else {
 151                 return -IPSET_ERR_MISSING_PROTO;
 152         }
 153
 154         if (!(with_ports || e.proto == IPPROTO_ICMP))
 155                 e.port = 0;
 156
 157         if (adt == IPSET_TEST ||
 158             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
 159               tb[IPSET_ATTR_PORT_TO])) {
 160                 ret = adtfn(set, &e, &ext, &ext, flags);
 161                 return ip_set_eexist(ret, flags) ? 0 : ret;
 162         }
 163
 164         ip_to = ip = ntohl(e.ip);
 165         if (tb[IPSET_ATTR_IP_TO]) {
 166                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 167                 if (ret)
 168                         return ret;
 169                 if (ip > ip_to)
 170                         swap(ip, ip_to);
 171         } else if (tb[IPSET_ATTR_CIDR]) {
 172                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 173
 174                 if (!cidr || cidr > HOST_MASK)
 175                         return -IPSET_ERR_INVALID_CIDR;
 176                 ip_set_mask_from_to(ip, ip_to, cidr);
 177         }
 178
 179         port_to = port = ntohs(e.port);
 180         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 181                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 182                 if (port > port_to)
 183                         swap(port, port_to);
 184         }
 185
 186         if (retried)
 187                 ip = ntohl(h->next.ip);
 188         for (; !before(ip_to, ip); ip++) {
 189                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 190                                                        : port;
 191                 for (; p <= port_to; p++) {
 192                         e.ip = htonl(ip);
 193                         e.port = htons(p);
 194                         ret = adtfn(set, &e, &ext, &ext, flags);
 195
 196                         if (ret && !ip_set_eexist(ret, flags))
 197                                 return ret;
 198
 199                         ret = 0;
 200                 }
 201         }
 202         return ret;
 203 }
 204
 205 /* IPv6 variant */
 206
 207 struct hash_ipportip6_elem {
 208         union nf_inet_addr ip;
 209         union nf_inet_addr ip2;
 210         __be16 port;
 211         u8 proto;
 212         u8 padding;
 213 };
 214
 215 /* Common functions */
 216
 217 static inline bool
 218 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
 219                           const struct hash_ipportip6_elem *ip2,
 220                           u32 *multi)
 221 {
 222         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 223                ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
 224                ip1->port == ip2->port &&
 225                ip1->proto == ip2->proto;
 226 }
 227
 228 static bool
 229 hash_ipportip6_data_list(struct sk_buff *skb,
 230                          const struct hash_ipportip6_elem *data)
 231 {
 232         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 233             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
 234             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 235             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 236                 goto nla_put_failure;
 237         return false;
 238
 239 nla_put_failure:
 240         return true;
 241 }
 242
 243 static inline void
 244 hash_ipportip6_data_next(struct hash_ipportip4_elem *next,
 245                          const struct hash_ipportip6_elem *d)
 246 {
 247         next->port = d->port;
 248 }
 249
 250 #undef MTYPE
 251 #undef HOST_MASK
 252
 253 #define MTYPE           hash_ipportip6
 254 #define HOST_MASK       128
 255 #define IP_SET_EMIT_CREATE
 256 #include "ip_set_hash_gen.h"
 257
 258 static int
 259 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 260                     const struct xt_action_param *par,
 261                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
 262 {
 263         ipset_adtfn adtfn = set->variant->adt[adt];
 264         struct hash_ipportip6_elem e = { .ip = { .all = { 0 } } };
 265         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 266
 267         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 268                                  &e.port, &e.proto))
 269                 return -EINVAL;
 270
 271         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 272         ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
 273         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 274 }
 275
 276 static int
 277 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
 278                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 279 {
 280         const struct hash_ipportip *h = set->data;
 281         ipset_adtfn adtfn = set->variant->adt[adt];
 282         struct hash_ipportip6_elem e = {  .ip = { .all = { 0 } } };
 283         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 284         u32 port, port_to;
 285         bool with_ports = false;
 286         int ret;
 287
 288         if (tb[IPSET_ATTR_LINENO])
 289                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 290
 291         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 292                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 293                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
 294                 return -IPSET_ERR_PROTOCOL;
 295         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 296                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 297         if (unlikely(tb[IPSET_ATTR_CIDR])) {
 298                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 299
 300                 if (cidr != HOST_MASK)
 301                         return -IPSET_ERR_INVALID_CIDR;
 302         }
 303
 304         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 305         if (ret)
 306                 return ret;
 307
 308         ret = ip_set_get_extensions(set, tb, &ext);
 309         if (ret)
 310                 return ret;
 311
 312         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
 313         if (ret)
 314                 return ret;
 315
 316         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 317
 318         if (tb[IPSET_ATTR_PROTO]) {
 319                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 320                 with_ports = ip_set_proto_with_ports(e.proto);
 321
 322                 if (e.proto == 0)
 323                         return -IPSET_ERR_INVALID_PROTO;
 324         } else {
 325                 return -IPSET_ERR_MISSING_PROTO;
 326         }
 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
 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                                             .len  = IPSET_MAX_COMMENT_SIZE },
 386                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 387                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 388                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 389         },
 390         .me             = THIS_MODULE,
 391 };
 392
 393 static int __init
 394 hash_ipportip_init(void)
 395 {
 396         return ip_set_type_register(&hash_ipportip_type);
 397 }
 398
 399 static void __exit
 400 hash_ipportip_fini(void)
 401 {
 402         rcu_barrier();
 403         ip_set_type_unregister(&hash_ipportip_type);
 404 }
 405
 406 module_init(hash_ipportip_init);
 407 module_exit(hash_ipportip_fini);