net/netfilter/ipset/ip_set_hash_ipport.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 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", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  37 MODULE_ALIAS("ip_set_hash:ip,port");
  38
  39 /* Type specific function prefix */
  40 #define HTYPE           hash_ipport
  41
  42 /* IPv4 variant */
  43
  44 /* Member elements */
  45 struct hash_ipport4_elem {
  46         __be32 ip;
  47         __be16 port;
  48         u8 proto;
  49         u8 padding;
  50 };
  51
  52 /* Common functions */
  53
  54 static inline bool
  55 hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1,
  56                         const struct hash_ipport4_elem *ip2,
  57                         u32 *multi)
  58 {
  59         return ip1->ip == ip2->ip &&
  60                ip1->port == ip2->port &&
  61                ip1->proto == ip2->proto;
  62 }
  63
  64 static bool
  65 hash_ipport4_data_list(struct sk_buff *skb,
  66                        const struct hash_ipport4_elem *data)
  67 {
  68         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  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_ipport4_data_next(struct hash_ipport4_elem *next,
  80                        const struct hash_ipport4_elem *d)
  81 {
  82         next->ip = d->ip;
  83         next->port = d->port;
  84 }
  85
  86 #define MTYPE           hash_ipport4
  87 #define HOST_MASK       32
  88 #define HKEY_DATALEN    sizeof(struct hash_ipport4_elem)
  89 #include "ip_set_hash_gen.h"
  90
  91 static int
  92 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb,
  93                   const struct xt_action_param *par,
  94                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
  95 {
  96         ipset_adtfn adtfn = set->variant->adt[adt];
  97         struct hash_ipport4_elem e = { .ip = 0 };
  98         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
  99
 100         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 101                                  &e.port, &e.proto))
 102                 return -EINVAL;
 103
 104         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 105         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 106 }
 107
 108 static int
 109 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
 110                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 111 {
 112         const struct hash_ipport *h = set->data;
 113         ipset_adtfn adtfn = set->variant->adt[adt];
 114         struct hash_ipport4_elem e = { .ip = 0 };
 115         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 116         u32 ip, ip_to = 0, p = 0, port, port_to;
 117         bool with_ports = false;
 118         int ret;
 119
 120         if (unlikely(!tb[IPSET_ATTR_IP] ||
 121                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 122                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 123                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 124                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 125                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
 126                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
 127                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
 128                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
 129                 return -IPSET_ERR_PROTOCOL;
 130
 131         if (tb[IPSET_ATTR_LINENO])
 132                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 133
 134         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
 135         if (ret)
 136                 return ret;
 137
 138         ret = ip_set_get_extensions(set, tb, &ext);
 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_ipport6_elem {
 210         union nf_inet_addr ip;
 211         __be16 port;
 212         u8 proto;
 213         u8 padding;
 214 };
 215
 216 /* Common functions */
 217
 218 static inline bool
 219 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
 220                         const struct hash_ipport6_elem *ip2,
 221                         u32 *multi)
 222 {
 223         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 224                ip1->port == ip2->port &&
 225                ip1->proto == ip2->proto;
 226 }
 227
 228 static bool
 229 hash_ipport6_data_list(struct sk_buff *skb,
 230                        const struct hash_ipport6_elem *data)
 231 {
 232         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 233             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 234             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 235                 goto nla_put_failure;
 236         return 0;
 237
 238 nla_put_failure:
 239         return 1;
 240 }
 241
 242 static inline void
 243 hash_ipport6_data_next(struct hash_ipport4_elem *next,
 244                        const struct hash_ipport6_elem *d)
 245 {
 246         next->port = d->port;
 247 }
 248
 249 #undef MTYPE
 250 #undef HOST_MASK
 251 #undef HKEY_DATALEN
 252
 253 #define MTYPE           hash_ipport6
 254 #define HOST_MASK       128
 255 #define HKEY_DATALEN    sizeof(struct hash_ipport6_elem)
 256 #define IP_SET_EMIT_CREATE
 257 #include "ip_set_hash_gen.h"
 258
 259 static int
 260 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 261                   const struct xt_action_param *par,
 262                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
 263 {
 264         ipset_adtfn adtfn = set->variant->adt[adt];
 265         struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
 266         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 267
 268         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 269                                  &e.port, &e.proto))
 270                 return -EINVAL;
 271
 272         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 273         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 274 }
 275
 276 static int
 277 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
 278                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 279 {
 280         const struct hash_ipport *h = set->data;
 281         ipset_adtfn adtfn = set->variant->adt[adt];
 282         struct hash_ipport6_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 (unlikely(!tb[IPSET_ATTR_IP] ||
 289                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 290                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 291                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 292                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 293                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
 294                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
 295                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
 296                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE) ||
 297                      tb[IPSET_ATTR_IP_TO] ||
 298                      tb[IPSET_ATTR_CIDR]))
 299                 return -IPSET_ERR_PROTOCOL;
 300
 301         if (tb[IPSET_ATTR_LINENO])
 302                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 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         if (tb[IPSET_ATTR_PORT])
 313                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 314         else
 315                 return -IPSET_ERR_PROTOCOL;
 316
 317         if (tb[IPSET_ATTR_PROTO]) {
 318                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 319                 with_ports = ip_set_proto_with_ports(e.proto);
 320
 321                 if (e.proto == 0)
 322                         return -IPSET_ERR_INVALID_PROTO;
 323         } else
 324                 return -IPSET_ERR_MISSING_PROTO;
 325
 326         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 327                 e.port = 0;
 328
 329         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 330                 ret = adtfn(set, &e, &ext, &ext, flags);
 331                 return ip_set_eexist(ret, flags) ? 0 : ret;
 332         }
 333
 334         port = ntohs(e.port);
 335         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 336         if (port > port_to)
 337                 swap(port, port_to);
 338
 339         if (retried)
 340                 port = ntohs(h->next.port);
 341         for (; port <= port_to; port++) {
 342                 e.port = htons(port);
 343                 ret = adtfn(set, &e, &ext, &ext, flags);
 344
 345                 if (ret && !ip_set_eexist(ret, flags))
 346                         return ret;
 347                 else
 348                         ret = 0;
 349         }
 350         return ret;
 351 }
 352
 353 static struct ip_set_type hash_ipport_type __read_mostly = {
 354         .name           = "hash:ip,port",
 355         .protocol       = IPSET_PROTOCOL,
 356         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT,
 357         .dimension      = IPSET_DIM_TWO,
 358         .family         = NFPROTO_UNSPEC,
 359         .revision_min   = IPSET_TYPE_REV_MIN,
 360         .revision_max   = IPSET_TYPE_REV_MAX,
 361         .create         = hash_ipport_create,
 362         .create_policy  = {
 363                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 364                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 365                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 366                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 367                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 368                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 369                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 370         },
 371         .adt_policy     = {
 372                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 373                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 374                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 375                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 376                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 377                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 378                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 379                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 380                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 381                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 382                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
 383                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 384                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 385                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 386         },
 387         .me             = THIS_MODULE,
 388 };
 389
 390 static int __init
 391 hash_ipport_init(void)
 392 {
 393         return ip_set_type_register(&hash_ipport_type);
 394 }
 395
 396 static void __exit
 397 hash_ipport_fini(void)
 398 {
 399         ip_set_type_unregister(&hash_ipport_type);
 400 }
 401
 402 module_init(hash_ipport_init);
 403 module_exit(hash_ipport_fini);