include/linux/netfilter/ipset/ip_set.h

   1 #ifndef _IP_SET_H
   2 #define _IP_SET_H
   3
   4 /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
   5  *                         Patrick Schaaf <bof@bof.de>
   6  *                         Martin Josefsson <gandalf@wlug.westbo.se>
   7  * Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/types.h>
  15
  16 /* The protocol version */
  17 #define IPSET_PROTOCOL          6
  18
  19 /* The max length of strings including NUL: set and type identifiers */
  20 #define IPSET_MAXNAMELEN        32
  21
  22 /* Message types and commands */
  23 enum ipset_cmd {
  24         IPSET_CMD_NONE,
  25         IPSET_CMD_PROTOCOL,     /* 1: Return protocol version */
  26         IPSET_CMD_CREATE,       /* 2: Create a new (empty) set */
  27         IPSET_CMD_DESTROY,      /* 3: Destroy a (empty) set */
  28         IPSET_CMD_FLUSH,        /* 4: Remove all elements from a set */
  29         IPSET_CMD_RENAME,       /* 5: Rename a set */
  30         IPSET_CMD_SWAP,         /* 6: Swap two sets */
  31         IPSET_CMD_LIST,         /* 7: List sets */
  32         IPSET_CMD_SAVE,         /* 8: Save sets */
  33         IPSET_CMD_ADD,          /* 9: Add an element to a set */
  34         IPSET_CMD_DEL,          /* 10: Delete an element from a set */
  35         IPSET_CMD_TEST,         /* 11: Test an element in a set */
  36         IPSET_CMD_HEADER,       /* 12: Get set header data only */
  37         IPSET_CMD_TYPE,         /* 13: Get set type */
  38         IPSET_MSG_MAX,          /* Netlink message commands */
  39
  40         /* Commands in userspace: */
  41         IPSET_CMD_RESTORE = IPSET_MSG_MAX, /* 14: Enter restore mode */
  42         IPSET_CMD_HELP,         /* 15: Get help */
  43         IPSET_CMD_VERSION,      /* 16: Get program version */
  44         IPSET_CMD_QUIT,         /* 17: Quit from interactive mode */
  45
  46         IPSET_CMD_MAX,
  47
  48         IPSET_CMD_COMMIT = IPSET_CMD_MAX, /* 18: Commit buffered commands */
  49 };
  50
  51 /* Attributes at command level */
  52 enum {
  53         IPSET_ATTR_UNSPEC,
  54         IPSET_ATTR_PROTOCOL,    /* 1: Protocol version */
  55         IPSET_ATTR_SETNAME,     /* 2: Name of the set */
  56         IPSET_ATTR_TYPENAME,    /* 3: Typename */
  57         IPSET_ATTR_SETNAME2 = IPSET_ATTR_TYPENAME, /* Setname at rename/swap */
  58         IPSET_ATTR_REVISION,    /* 4: Settype revision */
  59         IPSET_ATTR_FAMILY,      /* 5: Settype family */
  60         IPSET_ATTR_FLAGS,       /* 6: Flags at command level */
  61         IPSET_ATTR_DATA,        /* 7: Nested attributes */
  62         IPSET_ATTR_ADT,         /* 8: Multiple data containers */
  63         IPSET_ATTR_LINENO,      /* 9: Restore lineno */
  64         IPSET_ATTR_PROTOCOL_MIN, /* 10: Minimal supported version number */
  65         IPSET_ATTR_REVISION_MIN = IPSET_ATTR_PROTOCOL_MIN, /* type rev min */
  66         __IPSET_ATTR_CMD_MAX,
  67 };
  68 #define IPSET_ATTR_CMD_MAX      (__IPSET_ATTR_CMD_MAX - 1)
  69
  70 /* CADT specific attributes */
  71 enum {
  72         IPSET_ATTR_IP = IPSET_ATTR_UNSPEC + 1,
  73         IPSET_ATTR_IP_FROM = IPSET_ATTR_IP,
  74         IPSET_ATTR_IP_TO,       /* 2 */
  75         IPSET_ATTR_CIDR,        /* 3 */
  76         IPSET_ATTR_PORT,        /* 4 */
  77         IPSET_ATTR_PORT_FROM = IPSET_ATTR_PORT,
  78         IPSET_ATTR_PORT_TO,     /* 5 */
  79         IPSET_ATTR_TIMEOUT,     /* 6 */
  80         IPSET_ATTR_PROTO,       /* 7 */
  81         IPSET_ATTR_CADT_FLAGS,  /* 8 */
  82         IPSET_ATTR_CADT_LINENO = IPSET_ATTR_LINENO,     /* 9 */
  83         /* Reserve empty slots */
  84         IPSET_ATTR_CADT_MAX = 16,
  85         /* Create-only specific attributes */
  86         IPSET_ATTR_GC,
  87         IPSET_ATTR_HASHSIZE,
  88         IPSET_ATTR_MAXELEM,
  89         IPSET_ATTR_NETMASK,
  90         IPSET_ATTR_PROBES,
  91         IPSET_ATTR_RESIZE,
  92         IPSET_ATTR_SIZE,
  93         /* Kernel-only */
  94         IPSET_ATTR_ELEMENTS,
  95         IPSET_ATTR_REFERENCES,
  96         IPSET_ATTR_MEMSIZE,
  97
  98         __IPSET_ATTR_CREATE_MAX,
  99 };
 100 #define IPSET_ATTR_CREATE_MAX   (__IPSET_ATTR_CREATE_MAX - 1)
 101
 102 /* ADT specific attributes */
 103 enum {
 104         IPSET_ATTR_ETHER = IPSET_ATTR_CADT_MAX + 1,
 105         IPSET_ATTR_NAME,
 106         IPSET_ATTR_NAMEREF,
 107         IPSET_ATTR_IP2,
 108         IPSET_ATTR_CIDR2,
 109         IPSET_ATTR_IP2_TO,
 110         IPSET_ATTR_IFACE,
 111         __IPSET_ATTR_ADT_MAX,
 112 };
 113 #define IPSET_ATTR_ADT_MAX      (__IPSET_ATTR_ADT_MAX - 1)
 114
 115 /* IP specific attributes */
 116 enum {
 117         IPSET_ATTR_IPADDR_IPV4 = IPSET_ATTR_UNSPEC + 1,
 118         IPSET_ATTR_IPADDR_IPV6,
 119         __IPSET_ATTR_IPADDR_MAX,
 120 };
 121 #define IPSET_ATTR_IPADDR_MAX   (__IPSET_ATTR_IPADDR_MAX - 1)
 122
 123 /* Error codes */
 124 enum ipset_errno {
 125         IPSET_ERR_PRIVATE = 4096,
 126         IPSET_ERR_PROTOCOL,
 127         IPSET_ERR_FIND_TYPE,
 128         IPSET_ERR_MAX_SETS,
 129         IPSET_ERR_BUSY,
 130         IPSET_ERR_EXIST_SETNAME2,
 131         IPSET_ERR_TYPE_MISMATCH,
 132         IPSET_ERR_EXIST,
 133         IPSET_ERR_INVALID_CIDR,
 134         IPSET_ERR_INVALID_NETMASK,
 135         IPSET_ERR_INVALID_FAMILY,
 136         IPSET_ERR_TIMEOUT,
 137         IPSET_ERR_REFERENCED,
 138         IPSET_ERR_IPADDR_IPV4,
 139         IPSET_ERR_IPADDR_IPV6,
 140
 141         /* Type specific error codes */
 142         IPSET_ERR_TYPE_SPECIFIC = 4352,
 143 };
 144
 145 /* Flags at command level */
 146 enum ipset_cmd_flags {
 147         IPSET_FLAG_BIT_EXIST    = 0,
 148         IPSET_FLAG_EXIST        = (1 << IPSET_FLAG_BIT_EXIST),
 149         IPSET_FLAG_BIT_LIST_SETNAME = 1,
 150         IPSET_FLAG_LIST_SETNAME = (1 << IPSET_FLAG_BIT_LIST_SETNAME),
 151         IPSET_FLAG_BIT_LIST_HEADER = 2,
 152         IPSET_FLAG_LIST_HEADER  = (1 << IPSET_FLAG_BIT_LIST_HEADER),
 153         IPSET_FLAG_CMD_MAX = 15,        /* Lower half */
 154 };
 155
 156 /* Flags at CADT attribute level */
 157 enum ipset_cadt_flags {
 158         IPSET_FLAG_BIT_BEFORE   = 0,
 159         IPSET_FLAG_BEFORE       = (1 << IPSET_FLAG_BIT_BEFORE),
 160         IPSET_FLAG_BIT_PHYSDEV  = 1,
 161         IPSET_FLAG_PHYSDEV      = (1 << IPSET_FLAG_BIT_PHYSDEV),
 162         IPSET_FLAG_BIT_NOMATCH  = 2,
 163         IPSET_FLAG_NOMATCH      = (1 << IPSET_FLAG_BIT_NOMATCH),
 164         IPSET_FLAG_CADT_MAX     = 15,   /* Upper half */
 165 };
 166
 167 /* Commands with settype-specific attributes */
 168 enum ipset_adt {
 169         IPSET_ADD,
 170         IPSET_DEL,
 171         IPSET_TEST,
 172         IPSET_ADT_MAX,
 173         IPSET_CREATE = IPSET_ADT_MAX,
 174         IPSET_CADT_MAX,
 175 };
 176
 177 /* Sets are identified by an index in kernel space. Tweak with ip_set_id_t
 178  * and IPSET_INVALID_ID if you want to increase the max number of sets.
 179  */
 180 typedef __u16 ip_set_id_t;
 181
 182 #define IPSET_INVALID_ID                65535
 183
 184 enum ip_set_dim {
 185         IPSET_DIM_ZERO = 0,
 186         IPSET_DIM_ONE,
 187         IPSET_DIM_TWO,
 188         IPSET_DIM_THREE,
 189         /* Max dimension in elements.
 190          * If changed, new revision of iptables match/target is required.
 191          */
 192         IPSET_DIM_MAX = 6,
 193 };
 194
 195 /* Option flags for kernel operations */
 196 enum ip_set_kopt {
 197         IPSET_INV_MATCH = (1 << IPSET_DIM_ZERO),
 198         IPSET_DIM_ONE_SRC = (1 << IPSET_DIM_ONE),
 199         IPSET_DIM_TWO_SRC = (1 << IPSET_DIM_TWO),
 200         IPSET_DIM_THREE_SRC = (1 << IPSET_DIM_THREE),
 201 };
 202
 203 #ifdef __KERNEL__
 204 #include <linux/ip.h>
 205 #include <linux/ipv6.h>
 206 #include <linux/netlink.h>
 207 #include <linux/netfilter.h>
 208 #include <linux/netfilter/x_tables.h>
 209 #include <linux/vmalloc.h>
 210 #include <net/netlink.h>
 211
 212 /* Set features */
 213 enum ip_set_feature {
 214         IPSET_TYPE_IP_FLAG = 0,
 215         IPSET_TYPE_IP = (1 << IPSET_TYPE_IP_FLAG),
 216         IPSET_TYPE_PORT_FLAG = 1,
 217         IPSET_TYPE_PORT = (1 << IPSET_TYPE_PORT_FLAG),
 218         IPSET_TYPE_MAC_FLAG = 2,
 219         IPSET_TYPE_MAC = (1 << IPSET_TYPE_MAC_FLAG),
 220         IPSET_TYPE_IP2_FLAG = 3,
 221         IPSET_TYPE_IP2 = (1 << IPSET_TYPE_IP2_FLAG),
 222         IPSET_TYPE_NAME_FLAG = 4,
 223         IPSET_TYPE_NAME = (1 << IPSET_TYPE_NAME_FLAG),
 224         IPSET_TYPE_IFACE_FLAG = 5,
 225         IPSET_TYPE_IFACE = (1 << IPSET_TYPE_IFACE_FLAG),
 226         /* Strictly speaking not a feature, but a flag for dumping:
 227          * this settype must be dumped last */
 228         IPSET_DUMP_LAST_FLAG = 7,
 229         IPSET_DUMP_LAST = (1 << IPSET_DUMP_LAST_FLAG),
 230 };
 231
 232 struct ip_set;
 233
 234 typedef int (*ipset_adtfn)(struct ip_set *set, void *value,
 235                            u32 timeout, u32 flags);
 236
 237 /* Kernel API function options */
 238 struct ip_set_adt_opt {
 239         u8 family;              /* Actual protocol family */
 240         u8 dim;                 /* Dimension of match/target */
 241         u8 flags;               /* Direction and negation flags */
 242         u32 cmdflags;           /* Command-like flags */
 243         u32 timeout;            /* Timeout value */
 244 };
 245
 246 /* Set type, variant-specific part */
 247 struct ip_set_type_variant {
 248         /* Kernelspace: test/add/del entries
 249          *              returns negative error code,
 250          *                      zero for no match/success to add/delete
 251          *                      positive for matching element */
 252         int (*kadt)(struct ip_set *set, const struct sk_buff * skb,
 253                     const struct xt_action_param *par,
 254                     enum ipset_adt adt, const struct ip_set_adt_opt *opt);
 255
 256         /* Userspace: test/add/del entries
 257          *              returns negative error code,
 258          *                      zero for no match/success to add/delete
 259          *                      positive for matching element */
 260         int (*uadt)(struct ip_set *set, struct nlattr *tb[],
 261                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried);
 262
 263         /* Low level add/del/test functions */
 264         ipset_adtfn adt[IPSET_ADT_MAX];
 265
 266         /* When adding entries and set is full, try to resize the set */
 267         int (*resize)(struct ip_set *set, bool retried);
 268         /* Destroy the set */
 269         void (*destroy)(struct ip_set *set);
 270         /* Flush the elements */
 271         void (*flush)(struct ip_set *set);
 272         /* Expire entries before listing */
 273         void (*expire)(struct ip_set *set);
 274         /* List set header data */
 275         int (*head)(struct ip_set *set, struct sk_buff *skb);
 276         /* List elements */
 277         int (*list)(const struct ip_set *set, struct sk_buff *skb,
 278                     struct netlink_callback *cb);
 279
 280         /* Return true if "b" set is the same as "a"
 281          * according to the create set parameters */
 282         bool (*same_set)(const struct ip_set *a, const struct ip_set *b);
 283 };
 284
 285 /* The core set type structure */
 286 struct ip_set_type {
 287         struct list_head list;
 288
 289         /* Typename */
 290         char name[IPSET_MAXNAMELEN];
 291         /* Protocol version */
 292         u8 protocol;
 293         /* Set features to control swapping */
 294         u8 features;
 295         /* Set type dimension */
 296         u8 dimension;
 297         /*
 298          * Supported family: may be NFPROTO_UNSPEC for both
 299          * NFPROTO_IPV4/NFPROTO_IPV6.
 300          */
 301         u8 family;
 302         /* Type revisions */
 303         u8 revision_min, revision_max;
 304
 305         /* Create set */
 306         int (*create)(struct ip_set *set, struct nlattr *tb[], u32 flags);
 307
 308         /* Attribute policies */
 309         const struct nla_policy create_policy[IPSET_ATTR_CREATE_MAX + 1];
 310         const struct nla_policy adt_policy[IPSET_ATTR_ADT_MAX + 1];
 311
 312         /* Set this to THIS_MODULE if you are a module, otherwise NULL */
 313         struct module *me;
 314 };
 315
 316 /* register and unregister set type */
 317 extern int ip_set_type_register(struct ip_set_type *set_type);
 318 extern void ip_set_type_unregister(struct ip_set_type *set_type);
 319
 320 /* A generic IP set */
 321 struct ip_set {
 322         /* The name of the set */
 323         char name[IPSET_MAXNAMELEN];
 324         /* Lock protecting the set data */
 325         rwlock_t lock;
 326         /* References to the set */
 327         u32 ref;
 328         /* The core set type */
 329         struct ip_set_type *type;
 330         /* The type variant doing the real job */
 331         const struct ip_set_type_variant *variant;
 332         /* The actual INET family of the set */
 333         u8 family;
 334         /* The type revision */
 335         u8 revision;
 336         /* The type specific data */
 337         void *data;
 338 };
 339
 340 /* register and unregister set references */
 341 extern ip_set_id_t ip_set_get_byname(const char *name, struct ip_set **set);
 342 extern void ip_set_put_byindex(ip_set_id_t index);
 343 extern const char *ip_set_name_byindex(ip_set_id_t index);
 344 extern ip_set_id_t ip_set_nfnl_get(const char *name);
 345 extern ip_set_id_t ip_set_nfnl_get_byindex(ip_set_id_t index);
 346 extern void ip_set_nfnl_put(ip_set_id_t index);
 347
 348 /* API for iptables set match, and SET target */
 349
 350 extern int ip_set_add(ip_set_id_t id, const struct sk_buff *skb,
 351                       const struct xt_action_param *par,
 352                       const struct ip_set_adt_opt *opt);
 353 extern int ip_set_del(ip_set_id_t id, const struct sk_buff *skb,
 354                       const struct xt_action_param *par,
 355                       const struct ip_set_adt_opt *opt);
 356 extern int ip_set_test(ip_set_id_t id, const struct sk_buff *skb,
 357                        const struct xt_action_param *par,
 358                        const struct ip_set_adt_opt *opt);
 359
 360 /* Utility functions */
 361 extern void *ip_set_alloc(size_t size);
 362 extern void ip_set_free(void *members);
 363 extern int ip_set_get_ipaddr4(struct nlattr *nla,  __be32 *ipaddr);
 364 extern int ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr);
 365
 366 static inline int
 367 ip_set_get_hostipaddr4(struct nlattr *nla, u32 *ipaddr)
 368 {
 369         __be32 ip;
 370         int ret = ip_set_get_ipaddr4(nla, &ip);
 371
 372         if (ret)
 373                 return ret;
 374         *ipaddr = ntohl(ip);
 375         return 0;
 376 }
 377
 378 /* Ignore IPSET_ERR_EXIST errors if asked to do so? */
 379 static inline bool
 380 ip_set_eexist(int ret, u32 flags)
 381 {
 382         return ret == -IPSET_ERR_EXIST && (flags & IPSET_FLAG_EXIST);
 383 }
 384
 385 /* Check the NLA_F_NET_BYTEORDER flag */
 386 static inline bool
 387 ip_set_attr_netorder(struct nlattr *tb[], int type)
 388 {
 389         return tb[type] && (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
 390 }
 391
 392 static inline bool
 393 ip_set_optattr_netorder(struct nlattr *tb[], int type)
 394 {
 395         return !tb[type] || (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
 396 }
 397
 398 /* Useful converters */
 399 static inline u32
 400 ip_set_get_h32(const struct nlattr *attr)
 401 {
 402         return ntohl(nla_get_be32(attr));
 403 }
 404
 405 static inline u16
 406 ip_set_get_h16(const struct nlattr *attr)
 407 {
 408         return ntohs(nla_get_be16(attr));
 409 }
 410
 411 #define ipset_nest_start(skb, attr) nla_nest_start(skb, attr | NLA_F_NESTED)
 412 #define ipset_nest_end(skb, start)  nla_nest_end(skb, start)
 413
 414 #define NLA_PUT_IPADDR4(skb, type, ipaddr)                      \
 415 do {                                                            \
 416         struct nlattr *__nested = ipset_nest_start(skb, type);  \
 417                                                                 \
 418         if (!__nested)                                          \
 419                 goto nla_put_failure;                           \
 420         NLA_PUT_NET32(skb, IPSET_ATTR_IPADDR_IPV4, ipaddr);     \
 421         ipset_nest_end(skb, __nested);                          \
 422 } while (0)
 423
 424 #define NLA_PUT_IPADDR6(skb, type, ipaddrptr)                   \
 425 do {                                                            \
 426         struct nlattr *__nested = ipset_nest_start(skb, type);  \
 427                                                                 \
 428         if (!__nested)                                          \
 429                 goto nla_put_failure;                           \
 430         NLA_PUT(skb, IPSET_ATTR_IPADDR_IPV6,                    \
 431                 sizeof(struct in6_addr), ipaddrptr);            \
 432         ipset_nest_end(skb, __nested);                          \
 433 } while (0)
 434
 435 /* Get address from skbuff */
 436 static inline __be32
 437 ip4addr(const struct sk_buff *skb, bool src)
 438 {
 439         return src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
 440 }
 441
 442 static inline void
 443 ip4addrptr(const struct sk_buff *skb, bool src, __be32 *addr)
 444 {
 445         *addr = src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
 446 }
 447
 448 static inline void
 449 ip6addrptr(const struct sk_buff *skb, bool src, struct in6_addr *addr)
 450 {
 451         memcpy(addr, src ? &ipv6_hdr(skb)->saddr : &ipv6_hdr(skb)->daddr,
 452                sizeof(*addr));
 453 }
 454
 455 /* Calculate the bytes required to store the inclusive range of a-b */
 456 static inline int
 457 bitmap_bytes(u32 a, u32 b)
 458 {
 459         return 4 * ((((b - a + 8) / 8) + 3) / 4);
 460 }
 461
 462 #endif /* __KERNEL__ */
 463
 464 /* Interface to iptables/ip6tables */
 465
 466 #define SO_IP_SET               83
 467
 468 union ip_set_name_index {
 469         char name[IPSET_MAXNAMELEN];
 470         ip_set_id_t index;
 471 };
 472
 473 #define IP_SET_OP_GET_BYNAME    0x00000006      /* Get set index by name */
 474 struct ip_set_req_get_set {
 475         unsigned op;
 476         unsigned version;
 477         union ip_set_name_index set;
 478 };
 479
 480 #define IP_SET_OP_GET_BYINDEX   0x00000007      /* Get set name by index */
 481 /* Uses ip_set_req_get_set */
 482
 483 #define IP_SET_OP_VERSION       0x00000100      /* Ask kernel version */
 484 struct ip_set_req_version {
 485         unsigned op;
 486         unsigned version;
 487 };
 488
 489 #endif /*_IP_SET_H */