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 false;
  73
  74 nla_put_failure:
  75         return true;
  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 #include "ip_set_hash_gen.h"
  89
  90 static int
  91 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb,
  92                   const struct xt_action_param *par,
  93                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
  94 {
  95         ipset_adtfn adtfn = set->variant->adt[adt];
  96         struct hash_ipport4_elem e = { .ip = 0 };
  97         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
  98
  99         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 100                                  &e.port, &e.proto))
 101                 return -EINVAL;
 102
 103         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 104         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 105 }
 106
 107 static int
 108 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
 109                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 110 {
 111         const struct hash_ipport *h = set->data;
 112         ipset_adtfn adtfn = set->variant->adt[adt];
 113         struct hash_ipport4_elem e = { .ip = 0 };
 114         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 115         u32 ip, ip_to = 0, p = 0, port, port_to;
 116         bool with_ports = false;
 117         int ret;
 118
 119         if (tb[IPSET_ATTR_LINENO])
 120                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 121
 122         if (unlikely(!tb[IPSET_ATTR_IP] ||
 123                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 124                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
 125                 return -IPSET_ERR_PROTOCOL;
 126
 127         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
 128         if (ret)
 129                 return ret;
 130
 131         ret = ip_set_get_extensions(set, tb, &ext);
 132         if (ret)
 133                 return ret;
 134
 135         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 136
 137         if (tb[IPSET_ATTR_PROTO]) {
 138                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 139                 with_ports = ip_set_proto_with_ports(e.proto);
 140
 141                 if (e.proto == 0)
 142                         return -IPSET_ERR_INVALID_PROTO;
 143         } else
 144                 return -IPSET_ERR_MISSING_PROTO;
 145
 146         if (!(with_ports || e.proto == IPPROTO_ICMP))
 147                 e.port = 0;
 148
 149         if (adt == IPSET_TEST ||
 150             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
 151               tb[IPSET_ATTR_PORT_TO])) {
 152                 ret = adtfn(set, &e, &ext, &ext, flags);
 153                 return ip_set_eexist(ret, flags) ? 0 : ret;
 154         }
 155
 156         ip_to = ip = ntohl(e.ip);
 157         if (tb[IPSET_ATTR_IP_TO]) {
 158                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 159                 if (ret)
 160                         return ret;
 161                 if (ip > ip_to)
 162                         swap(ip, ip_to);
 163         } else if (tb[IPSET_ATTR_CIDR]) {
 164                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 165
 166                 if (!cidr || cidr > HOST_MASK)
 167                         return -IPSET_ERR_INVALID_CIDR;
 168                 ip_set_mask_from_to(ip, ip_to, cidr);
 169         }
 170
 171         port_to = port = ntohs(e.port);
 172         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 173                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 174                 if (port > port_to)
 175                         swap(port, port_to);
 176         }
 177
 178         if (retried)
 179                 ip = ntohl(h->next.ip);
 180         for (; !before(ip_to, ip); ip++) {
 181                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 182                                                        : port;
 183                 for (; p <= port_to; p++) {
 184                         e.ip = htonl(ip);
 185                         e.port = htons(p);
 186                         ret = adtfn(set, &e, &ext, &ext, flags);
 187
 188                         if (ret && !ip_set_eexist(ret, flags))
 189                                 return ret;
 190                         else
 191                                 ret = 0;
 192                 }
 193         }
 194         return ret;
 195 }
 196
 197 /* IPv6 variant */
 198
 199 struct hash_ipport6_elem {
 200         union nf_inet_addr ip;
 201         __be16 port;
 202         u8 proto;
 203         u8 padding;
 204 };
 205
 206 /* Common functions */
 207
 208 static inline bool
 209 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
 210                         const struct hash_ipport6_elem *ip2,
 211                         u32 *multi)
 212 {
 213         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 214                ip1->port == ip2->port &&
 215                ip1->proto == ip2->proto;
 216 }
 217
 218 static bool
 219 hash_ipport6_data_list(struct sk_buff *skb,
 220                        const struct hash_ipport6_elem *data)
 221 {
 222         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 223             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 224             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 225                 goto nla_put_failure;
 226         return false;
 227
 228 nla_put_failure:
 229         return true;
 230 }
 231
 232 static inline void
 233 hash_ipport6_data_next(struct hash_ipport4_elem *next,
 234                        const struct hash_ipport6_elem *d)
 235 {
 236         next->port = d->port;
 237 }
 238
 239 #undef MTYPE
 240 #undef HOST_MASK
 241
 242 #define MTYPE           hash_ipport6
 243 #define HOST_MASK       128
 244 #define IP_SET_EMIT_CREATE
 245 #include "ip_set_hash_gen.h"
 246
 247 static int
 248 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 249                   const struct xt_action_param *par,
 250                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
 251 {
 252         ipset_adtfn adtfn = set->variant->adt[adt];
 253         struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
 254         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 255
 256         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 257                                  &e.port, &e.proto))
 258                 return -EINVAL;
 259
 260         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 261         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 262 }
 263
 264 static int
 265 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
 266                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 267 {
 268         const struct hash_ipport *h = set->data;
 269         ipset_adtfn adtfn = set->variant->adt[adt];
 270         struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
 271         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 272         u32 port, port_to;
 273         bool with_ports = false;
 274         int ret;
 275
 276         if (tb[IPSET_ATTR_LINENO])
 277                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 278
 279         if (unlikely(!tb[IPSET_ATTR_IP] ||
 280                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 281                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
 282                 return -IPSET_ERR_PROTOCOL;
 283         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 284                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 285         if (unlikely(tb[IPSET_ATTR_CIDR])) {
 286                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 287
 288                 if (cidr != HOST_MASK)
 289                         return -IPSET_ERR_INVALID_CIDR;
 290         }
 291
 292         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 293         if (ret)
 294                 return ret;
 295
 296         ret = ip_set_get_extensions(set, tb, &ext);
 297         if (ret)
 298                 return ret;
 299
 300         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 301
 302         if (tb[IPSET_ATTR_PROTO]) {
 303                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 304                 with_ports = ip_set_proto_with_ports(e.proto);
 305
 306                 if (e.proto == 0)
 307                         return -IPSET_ERR_INVALID_PROTO;
 308         } else
 309                 return -IPSET_ERR_MISSING_PROTO;
 310
 311         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 312                 e.port = 0;
 313
 314         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 315                 ret = adtfn(set, &e, &ext, &ext, flags);
 316                 return ip_set_eexist(ret, flags) ? 0 : ret;
 317         }
 318
 319         port = ntohs(e.port);
 320         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 321         if (port > port_to)
 322                 swap(port, port_to);
 323
 324         if (retried)
 325                 port = ntohs(h->next.port);
 326         for (; port <= port_to; port++) {
 327                 e.port = htons(port);
 328                 ret = adtfn(set, &e, &ext, &ext, flags);
 329
 330                 if (ret && !ip_set_eexist(ret, flags))
 331                         return ret;
 332                 else
 333                         ret = 0;
 334         }
 335         return ret;
 336 }
 337
 338 static struct ip_set_type hash_ipport_type __read_mostly = {
 339         .name           = "hash:ip,port",
 340         .protocol       = IPSET_PROTOCOL,
 341         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT,
 342         .dimension      = IPSET_DIM_TWO,
 343         .family         = NFPROTO_UNSPEC,
 344         .revision_min   = IPSET_TYPE_REV_MIN,
 345         .revision_max   = IPSET_TYPE_REV_MAX,
 346         .create         = hash_ipport_create,
 347         .create_policy  = {
 348                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 349                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 350                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 351                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 352                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 353                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 354                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 355         },
 356         .adt_policy     = {
 357                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 358                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 359                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 360                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 361                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 362                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 363                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 364                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 365                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 366                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 367                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 368                                             .len  = IPSET_MAX_COMMENT_SIZE },
 369                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 370                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 371                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 372         },
 373         .me             = THIS_MODULE,
 374 };
 375
 376 static int __init
 377 hash_ipport_init(void)
 378 {
 379         return ip_set_type_register(&hash_ipport_type);
 380 }
 381
 382 static void __exit
 383 hash_ipport_fini(void)
 384 {
 385         ip_set_type_unregister(&hash_ipport_type);
 386 }
 387
 388 module_init(hash_ipport_init);
 389 module_exit(hash_ipport_fini);