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 #define IPSET_TYPE_REV_MAX      3 /* Comments support added */
  31
  32 MODULE_LICENSE("GPL");
  33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  34 IP_SET_MODULE_DESC("hash:ip,port,ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  35 MODULE_ALIAS("ip_set_hash:ip,port,ip");
  36
  37 /* Type specific function prefix */
  38 #define HTYPE           hash_ipportip
  39
  40 /* IPv4 variant */
  41
  42 /* Member elements  */
  43 struct hash_ipportip4_elem {
  44         __be32 ip;
  45         __be32 ip2;
  46         __be16 port;
  47         u8 proto;
  48         u8 padding;
  49 };
  50
  51 static inline bool
  52 hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
  53                           const struct hash_ipportip4_elem *ip2,
  54                           u32 *multi)
  55 {
  56         return ip1->ip == ip2->ip &&
  57                ip1->ip2 == ip2->ip2 &&
  58                ip1->port == ip2->port &&
  59                ip1->proto == ip2->proto;
  60 }
  61
  62 static bool
  63 hash_ipportip4_data_list(struct sk_buff *skb,
  64                        const struct hash_ipportip4_elem *data)
  65 {
  66         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  67             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
  68             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
  69             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
  70                 goto nla_put_failure;
  71         return 0;
  72
  73 nla_put_failure:
  74         return 1;
  75 }
  76
  77 static inline void
  78 hash_ipportip4_data_next(struct hash_ipportip4_elem *next,
  79                          const struct hash_ipportip4_elem *d)
  80 {
  81         next->ip = d->ip;
  82         next->port = d->port;
  83 }
  84
  85 /* Common functions */
  86 #define MTYPE           hash_ipportip4
  87 #define PF              4
  88 #define HOST_MASK       32
  89 #include "ip_set_hash_gen.h"
  90
  91 static int
  92 hash_ipportip4_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_ipportip4_elem e = { };
  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         ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2);
 106         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 107 }
 108
 109 static int
 110 hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
 111                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 112 {
 113         const struct hash_ipportip *h = set->data;
 114         ipset_adtfn adtfn = set->variant->adt[adt];
 115         struct hash_ipportip4_elem e = { };
 116         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 117         u32 ip, ip_to = 0, p = 0, port, port_to;
 118         bool with_ports = false;
 119         int ret;
 120
 121         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
 122                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 123                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
 124                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 125                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 126                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 127                 return -IPSET_ERR_PROTOCOL;
 128
 129         if (tb[IPSET_ATTR_LINENO])
 130                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 131
 132         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
 133               ip_set_get_extensions(set, tb, &ext);
 134         if (ret)
 135                 return ret;
 136
 137         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP2], &e.ip2);
 138         if (ret)
 139                 return ret;
 140
 141         if (tb[IPSET_ATTR_PORT])
 142                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 143         else
 144                 return -IPSET_ERR_PROTOCOL;
 145
 146         if (tb[IPSET_ATTR_PROTO]) {
 147                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 148                 with_ports = ip_set_proto_with_ports(e.proto);
 149
 150                 if (e.proto == 0)
 151                         return -IPSET_ERR_INVALID_PROTO;
 152         } else
 153                 return -IPSET_ERR_MISSING_PROTO;
 154
 155         if (!(with_ports || e.proto == IPPROTO_ICMP))
 156                 e.port = 0;
 157
 158         if (adt == IPSET_TEST ||
 159             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
 160               tb[IPSET_ATTR_PORT_TO])) {
 161                 ret = adtfn(set, &e, &ext, &ext, flags);
 162                 return ip_set_eexist(ret, flags) ? 0 : ret;
 163         }
 164
 165         ip_to = ip = ntohl(e.ip);
 166         if (tb[IPSET_ATTR_IP_TO]) {
 167                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 168                 if (ret)
 169                         return ret;
 170                 if (ip > ip_to)
 171                         swap(ip, ip_to);
 172         } else if (tb[IPSET_ATTR_CIDR]) {
 173                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 174
 175                 if (!cidr || cidr > 32)
 176                         return -IPSET_ERR_INVALID_CIDR;
 177                 ip_set_mask_from_to(ip, ip_to, cidr);
 178         }
 179
 180         port_to = port = ntohs(e.port);
 181         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 182                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 183                 if (port > port_to)
 184                         swap(port, port_to);
 185         }
 186
 187         if (retried)
 188                 ip = ntohl(h->next.ip);
 189         for (; !before(ip_to, ip); ip++) {
 190                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 191                                                        : port;
 192                 for (; p <= port_to; p++) {
 193                         e.ip = htonl(ip);
 194                         e.port = htons(p);
 195                         ret = adtfn(set, &e, &ext, &ext, flags);
 196
 197                         if (ret && !ip_set_eexist(ret, flags))
 198                                 return ret;
 199                         else
 200                                 ret = 0;
 201                 }
 202         }
 203         return ret;
 204 }
 205
 206 /* IPv6 variant */
 207
 208 struct hash_ipportip6_elem {
 209         union nf_inet_addr ip;
 210         union nf_inet_addr ip2;
 211         __be16 port;
 212         u8 proto;
 213         u8 padding;
 214 };
 215
 216 /* Common functions */
 217
 218 static inline bool
 219 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
 220                           const struct hash_ipportip6_elem *ip2,
 221                           u32 *multi)
 222 {
 223         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 224                ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
 225                ip1->port == ip2->port &&
 226                ip1->proto == ip2->proto;
 227 }
 228
 229 static bool
 230 hash_ipportip6_data_list(struct sk_buff *skb,
 231                          const struct hash_ipportip6_elem *data)
 232 {
 233         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 234             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
 235             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 236             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 237                 goto nla_put_failure;
 238         return 0;
 239
 240 nla_put_failure:
 241         return 1;
 242 }
 243
 244 static inline void
 245 hash_ipportip6_data_next(struct hash_ipportip4_elem *next,
 246                          const struct hash_ipportip6_elem *d)
 247 {
 248         next->port = d->port;
 249 }
 250
 251 #undef MTYPE
 252 #undef PF
 253 #undef HOST_MASK
 254
 255 #define MTYPE           hash_ipportip6
 256 #define PF              6
 257 #define HOST_MASK       128
 258 #define IP_SET_EMIT_CREATE
 259 #include "ip_set_hash_gen.h"
 260
 261 static int
 262 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 263                     const struct xt_action_param *par,
 264                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
 265 {
 266         ipset_adtfn adtfn = set->variant->adt[adt];
 267         struct hash_ipportip6_elem e = { };
 268         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 269
 270         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 271                                  &e.port, &e.proto))
 272                 return -EINVAL;
 273
 274         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 275         ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
 276         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 277 }
 278
 279 static int
 280 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
 281                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 282 {
 283         const struct hash_ipportip *h = set->data;
 284         ipset_adtfn adtfn = set->variant->adt[adt];
 285         struct hash_ipportip6_elem e = { };
 286         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 287         u32 port, port_to;
 288         bool with_ports = false;
 289         int ret;
 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                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 295                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 296                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
 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               ip_set_get_extensions(set, tb, &ext);
 306         if (ret)
 307                 return ret;
 308
 309         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
 310         if (ret)
 311                 return ret;
 312
 313         if (tb[IPSET_ATTR_PORT])
 314                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 315         else
 316                 return -IPSET_ERR_PROTOCOL;
 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         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 328                 e.port = 0;
 329
 330         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 331                 ret = adtfn(set, &e, &ext, &ext, flags);
 332                 return ip_set_eexist(ret, flags) ? 0 : ret;
 333         }
 334
 335         port = ntohs(e.port);
 336         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 337         if (port > port_to)
 338                 swap(port, port_to);
 339
 340         if (retried)
 341                 port = ntohs(h->next.port);
 342         for (; port <= port_to; port++) {
 343                 e.port = htons(port);
 344                 ret = adtfn(set, &e, &ext, &ext, flags);
 345
 346                 if (ret && !ip_set_eexist(ret, flags))
 347                         return ret;
 348                 else
 349                         ret = 0;
 350         }
 351         return ret;
 352 }
 353
 354 static struct ip_set_type hash_ipportip_type __read_mostly = {
 355         .name           = "hash:ip,port,ip",
 356         .protocol       = IPSET_PROTOCOL,
 357         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
 358         .dimension      = IPSET_DIM_THREE,
 359         .family         = NFPROTO_UNSPEC,
 360         .revision_min   = IPSET_TYPE_REV_MIN,
 361         .revision_max   = IPSET_TYPE_REV_MAX,
 362         .create         = hash_ipportip_create,
 363         .create_policy  = {
 364                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 365                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 366                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 367                 [IPSET_ATTR_RESIZE]     = { .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_IP2]        = { .type = NLA_NESTED },
 375                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 376                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 377                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 378                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 379                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 380                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 381                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 382                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 383                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
 384         },
 385         .me             = THIS_MODULE,
 386 };
 387
 388 static int __init
 389 hash_ipportip_init(void)
 390 {
 391         return ip_set_type_register(&hash_ipportip_type);
 392 }
 393
 394 static void __exit
 395 hash_ipportip_fini(void)
 396 {
 397         ip_set_type_unregister(&hash_ipportip_type);
 398 }
 399
 400 module_init(hash_ipportip_init);
 401 module_exit(hash_ipportip_fini);