include/net/sctp/sctp.h

   1 /* SCTP kernel reference Implementation
   2  * (C) Copyright IBM Corp. 2001, 2004
   3  * Copyright (c) 1999-2000 Cisco, Inc.
   4  * Copyright (c) 1999-2001 Motorola, Inc.
   5  * Copyright (c) 2001-2003 Intel Corp.
   6  *
   7  * This file is part of the SCTP kernel reference Implementation
   8  *
   9  * The base lksctp header.
  10  *
  11  * The SCTP reference implementation is free software;
  12  * you can redistribute it and/or modify it under the terms of
  13  * the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2, or (at your option)
  15  * any later version.
  16  *
  17  * The SCTP reference implementation is distributed in the hope that it
  18  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  19  *                 ************************
  20  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  21  * See the GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with GNU CC; see the file COPYING.  If not, write to
  25  * the Free Software Foundation, 59 Temple Place - Suite 330,
  26  * Boston, MA 02111-1307, USA.
  27  *
  28  * Please send any bug reports or fixes you make to the
  29  * email address(es):
  30  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  31  *
  32  * Or submit a bug report through the following website:
  33  *    http://www.sf.net/projects/lksctp
  34  *
  35  * Written or modified by:
  36  *    La Monte H.P. Yarroll <piggy@acm.org>
  37  *    Xingang Guo           <xingang.guo@intel.com>
  38  *    Jon Grimm             <jgrimm@us.ibm.com>
  39  *    Daisy Chang           <daisyc@us.ibm.com>
  40  *    Sridhar Samudrala     <sri@us.ibm.com>
  41  *    Ardelle Fan           <ardelle.fan@intel.com>
  42  *    Ryan Layer            <rmlayer@us.ibm.com>
  43  *    Kevin Gao             <kevin.gao@intel.com>
  44  *
  45  * Any bugs reported given to us we will try to fix... any fixes shared will
  46  * be incorporated into the next SCTP release.
  47  */
  48
  49 #ifndef __net_sctp_h__
  50 #define __net_sctp_h__
  51
  52 /* Header Strategy.
  53  *    Start getting some control over the header file depencies:
  54  *       includes
  55  *       constants
  56  *       structs
  57  *       prototypes
  58  *       macros, externs, and inlines
  59  *
  60  *   Move test_frame specific items out of the kernel headers
  61  *   and into the test frame headers.   This is not perfect in any sense
  62  *   and will continue to evolve.
  63  */
  64
  65
  66 #include <linux/config.h>
  67
  68 #ifdef TEST_FRAME
  69 #undef CONFIG_PROC_FS
  70 #undef CONFIG_SCTP_DBG_OBJCNT
  71 #undef CONFIG_SYSCTL
  72 #endif /* TEST_FRAME */
  73
  74 #include <linux/types.h>
  75 #include <linux/slab.h>
  76 #include <linux/in.h>
  77 #include <linux/tty.h>
  78 #include <linux/proc_fs.h>
  79 #include <linux/spinlock.h>
  80 #include <linux/jiffies.h>
  81 #include <linux/idr.h>
  82
  83 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  84 #include <net/ipv6.h>
  85 #include <net/ip6_route.h>
  86 #endif
  87
  88 #include <asm/uaccess.h>
  89 #include <asm/page.h>
  90 #include <net/sock.h>
  91 #include <net/snmp.h>
  92 #include <net/sctp/structs.h>
  93 #include <net/sctp/constants.h>
  94
  95
  96 /* Set SCTP_DEBUG flag via config if not already set. */
  97 #ifndef SCTP_DEBUG
  98 #ifdef CONFIG_SCTP_DBG_MSG
  99 #define SCTP_DEBUG      1
 100 #else
 101 #define SCTP_DEBUG      0
 102 #endif /* CONFIG_SCTP_DBG */
 103 #endif /* SCTP_DEBUG */
 104
 105 #ifdef CONFIG_IP_SCTP_MODULE
 106 #define SCTP_PROTOSW_FLAG 0
 107 #else /* static! */
 108 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
 109 #endif
 110
 111
 112 /* Certain internal static functions need to be exported when
 113  * compiled into the test frame.
 114  */
 115 #ifndef SCTP_STATIC
 116 #define SCTP_STATIC static
 117 #endif
 118
 119 /*
 120  * Function declarations.
 121  */
 122
 123 /*
 124  * sctp/protocol.c
 125  */
 126 extern struct sock *sctp_get_ctl_sock(void);
 127 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
 128                                      sctp_scope_t, int gfp, int flags);
 129 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
 130 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
 131
 132 /*
 133  * sctp/socket.c
 134  */
 135 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
 136 int sctp_inet_listen(struct socket *sock, int backlog);
 137 void sctp_write_space(struct sock *sk);
 138 unsigned int sctp_poll(struct file *file, struct socket *sock,
 139                 poll_table *wait);
 140
 141 /*
 142  * sctp/primitive.c
 143  */
 144 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
 145 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
 146 int sctp_primitive_ABORT(struct sctp_association *, void *arg);
 147 int sctp_primitive_SEND(struct sctp_association *, void *arg);
 148 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
 149 int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
 150
 151 /*
 152  * sctp/crc32c.c
 153  */
 154 __u32 sctp_start_cksum(__u8 *ptr, __u16 count);
 155 __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum);
 156 __u32 sctp_end_cksum(__u32 cksum);
 157 __u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum);
 158
 159 /*
 160  * sctp/input.c
 161  */
 162 int sctp_rcv(struct sk_buff *skb);
 163 void sctp_v4_err(struct sk_buff *skb, u32 info);
 164 void sctp_hash_established(struct sctp_association *);
 165 void sctp_unhash_established(struct sctp_association *);
 166 void sctp_hash_endpoint(struct sctp_endpoint *);
 167 void sctp_unhash_endpoint(struct sctp_endpoint *);
 168 struct sock *sctp_err_lookup(int family, struct sk_buff *,
 169                              struct sctphdr *, struct sctp_endpoint **,
 170                              struct sctp_association **,
 171                              struct sctp_transport **);
 172 void sctp_err_finish(struct sock *, struct sctp_endpoint *,
 173                             struct sctp_association *);
 174 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
 175                            struct sctp_transport *t, __u32 pmtu);
 176 void sctp_icmp_proto_unreachable(struct sock *sk,
 177                                  struct sctp_endpoint *ep,
 178                                  struct sctp_association *asoc,
 179                                  struct sctp_transport *t);
 180
 181 /*
 182  *  Section:  Macros, externs, and inlines
 183  */
 184
 185
 186 #ifdef TEST_FRAME
 187 #include <test_frame.h>
 188 #else
 189
 190 /* spin lock wrappers. */
 191 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
 192 #define sctp_spin_unlock_irqrestore(lock, flags)  \
 193        spin_unlock_irqrestore(lock, flags)
 194 #define sctp_local_bh_disable() local_bh_disable()
 195 #define sctp_local_bh_enable()  local_bh_enable()
 196 #define sctp_spin_lock(lock)    spin_lock(lock)
 197 #define sctp_spin_unlock(lock)  spin_unlock(lock)
 198 #define sctp_write_lock(lock)   write_lock(lock)
 199 #define sctp_write_unlock(lock) write_unlock(lock)
 200 #define sctp_read_lock(lock)    read_lock(lock)
 201 #define sctp_read_unlock(lock)  read_unlock(lock)
 202
 203 /* sock lock wrappers. */
 204 #define sctp_lock_sock(sk)       lock_sock(sk)
 205 #define sctp_release_sock(sk)    release_sock(sk)
 206 #define sctp_bh_lock_sock(sk)    bh_lock_sock(sk)
 207 #define sctp_bh_unlock_sock(sk)  bh_unlock_sock(sk)
 208 #define SCTP_SOCK_SLEEP_PRE(sk)  SOCK_SLEEP_PRE(sk)
 209 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk)
 210
 211 /* SCTP SNMP MIB stats handlers */
 212 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
 213 #define SCTP_INC_STATS(field)      SNMP_INC_STATS(sctp_statistics, field)
 214 #define SCTP_INC_STATS_BH(field)   SNMP_INC_STATS_BH(sctp_statistics, field)
 215 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
 216 #define SCTP_DEC_STATS(field)      SNMP_DEC_STATS(sctp_statistics, field)
 217
 218 #endif /* !TEST_FRAME */
 219
 220
 221 /* Print debugging messages.  */
 222 #if SCTP_DEBUG
 223 extern int sctp_debug_flag;
 224 #define SCTP_DEBUG_PRINTK(whatever...) \
 225         ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
 226 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
 227 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
 228
 229 #define SCTP_ASSERT(expr, str, func) \
 230         if (!(expr)) { \
 231                 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
 232                         str, (#expr), __FILE__, __FUNCTION__, __LINE__); \
 233                 func; \
 234         }
 235
 236 #else   /* SCTP_DEBUG */
 237
 238 #define SCTP_DEBUG_PRINTK(whatever...)
 239 #define SCTP_ENABLE_DEBUG
 240 #define SCTP_DISABLE_DEBUG
 241 #define SCTP_ASSERT(expr, str, func)
 242
 243 #endif /* SCTP_DEBUG */
 244
 245
 246 /*
 247  * Macros for keeping a global reference of object allocations.
 248  */
 249 #ifdef CONFIG_SCTP_DBG_OBJCNT
 250
 251 extern atomic_t sctp_dbg_objcnt_sock;
 252 extern atomic_t sctp_dbg_objcnt_ep;
 253 extern atomic_t sctp_dbg_objcnt_assoc;
 254 extern atomic_t sctp_dbg_objcnt_transport;
 255 extern atomic_t sctp_dbg_objcnt_chunk;
 256 extern atomic_t sctp_dbg_objcnt_bind_addr;
 257 extern atomic_t sctp_dbg_objcnt_bind_bucket;
 258 extern atomic_t sctp_dbg_objcnt_addr;
 259 extern atomic_t sctp_dbg_objcnt_ssnmap;
 260 extern atomic_t sctp_dbg_objcnt_datamsg;
 261
 262 /* Macros to atomically increment/decrement objcnt counters.  */
 263 #define SCTP_DBG_OBJCNT_INC(name) \
 264 atomic_inc(&sctp_dbg_objcnt_## name)
 265 #define SCTP_DBG_OBJCNT_DEC(name) \
 266 atomic_dec(&sctp_dbg_objcnt_## name)
 267 #define SCTP_DBG_OBJCNT(name) \
 268 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
 269
 270 /* Macro to help create new entries in in the global array of
 271  * objcnt counters.
 272  */
 273 #define SCTP_DBG_OBJCNT_ENTRY(name) \
 274 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
 275
 276 void sctp_dbg_objcnt_init(void);
 277 void sctp_dbg_objcnt_exit(void);
 278
 279 #else
 280
 281 #define SCTP_DBG_OBJCNT_INC(name)
 282 #define SCTP_DBG_OBJCNT_DEC(name)
 283
 284 static inline void sctp_dbg_objcnt_init(void) { return; }
 285 static inline void sctp_dbg_objcnt_exit(void) { return; }
 286
 287 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
 288
 289 #if defined CONFIG_SYSCTL
 290 void sctp_sysctl_register(void);
 291 void sctp_sysctl_unregister(void);
 292 #else
 293 static inline void sctp_sysctl_register(void) { return; }
 294 static inline void sctp_sysctl_unregister(void) { return; }
 295 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
 296                 void __user *oldval, size_t __user *oldlenp,
 297                 void __user *newval, size_t newlen, void **context) {
 298         return -ENOSYS;
 299 }
 300 #endif
 301
 302 /* Size of Supported Address Parameter for 'x' address types. */
 303 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
 304
 305 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 306
 307 int sctp_v6_init(void);
 308 void sctp_v6_exit(void);
 309
 310 #else /* #ifdef defined(CONFIG_IPV6) */
 311
 312 static inline int sctp_v6_init(void) { return 0; }
 313 static inline void sctp_v6_exit(void) { return; }
 314
 315 #endif /* #if defined(CONFIG_IPV6) */
 316
 317 /* Some wrappers, in case crypto not available. */
 318 #if defined (CONFIG_CRYPTO_HMAC)
 319 #define sctp_crypto_alloc_tfm crypto_alloc_tfm
 320 #define sctp_crypto_free_tfm crypto_free_tfm
 321 #define sctp_crypto_hmac crypto_hmac
 322 #else
 323 #define sctp_crypto_alloc_tfm(x...) NULL
 324 #define sctp_crypto_free_tfm(x...)
 325 #define sctp_crypto_hmac(x...)
 326 #endif
 327
 328
 329 /* Map an association to an assoc_id. */
 330 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
 331 {
 332         return (asoc?asoc->assoc_id:0);
 333 }
 334
 335 /* Look up the association by its id.  */
 336 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
 337
 338
 339 /* A macro to walk a list of skbs.  */
 340 #define sctp_skb_for_each(pos, head, tmp) \
 341 for (pos = (head)->next;\
 342      tmp = (pos)->next, pos != ((struct sk_buff *)(head));\
 343      pos = tmp)
 344
 345
 346 /* A helper to append an entire skb list (list) to another (head). */
 347 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
 348                                       struct sk_buff_head *head)
 349 {
 350         unsigned long flags;
 351
 352         sctp_spin_lock_irqsave(&head->lock, flags);
 353         sctp_spin_lock(&list->lock);
 354
 355         list_splice((struct list_head *)list, (struct list_head *)head->prev);
 356
 357         head->qlen += list->qlen;
 358         list->qlen = 0;
 359
 360         sctp_spin_unlock(&list->lock);
 361         sctp_spin_unlock_irqrestore(&head->lock, flags);
 362 }
 363
 364 /**
 365  *      sctp_list_dequeue - remove from the head of the queue
 366  *      @list: list to dequeue from
 367  *
 368  *      Remove the head of the list. The head item is
 369  *      returned or %NULL if the list is empty.
 370  */
 371
 372 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
 373 {
 374         struct list_head *result = NULL;
 375
 376         if (list->next != list) {
 377                 result = list->next;
 378                 list->next = result->next;
 379                 list->next->prev = list;
 380                 INIT_LIST_HEAD(result);
 381         }
 382         return result;
 383 }
 384
 385 /* Tests if the list has one and only one entry. */
 386 static inline int sctp_list_single_entry(struct list_head *head)
 387 {
 388         return ((head->next != head) && (head->next == head->prev));
 389 }
 390
 391 /* Calculate the size (in bytes) occupied by the data of an iovec.  */
 392 static inline size_t get_user_iov_size(struct iovec *iov, int iovlen)
 393 {
 394         size_t retval = 0;
 395
 396         for (; iovlen > 0; --iovlen) {
 397                 retval += iov->iov_len;
 398                 iov++;
 399         }
 400
 401         return retval;
 402 }
 403
 404 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
 405 static inline __s32 sctp_jitter(__u32 rto)
 406 {
 407         static __u32 sctp_rand;
 408         __s32 ret;
 409
 410         /* Avoid divide by zero. */
 411         if (!rto)
 412                 rto = 1;
 413
 414         sctp_rand += jiffies;
 415         sctp_rand ^= (sctp_rand << 12);
 416         sctp_rand ^= (sctp_rand >> 20);
 417
 418         /* Choose random number from 0 to rto, then move to -50% ~ +50%
 419          * of rto.
 420          */
 421         ret = sctp_rand % rto - (rto >> 1);
 422         return ret;
 423 }
 424
 425 /* Break down data chunks at this point.  */
 426 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu)
 427 {
 428         int frag = pmtu;
 429
 430         frag -= sp->pf->af->net_header_len;
 431         frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
 432
 433         if (sp->user_frag)
 434                 frag = min_t(int, frag, sp->user_frag);
 435
 436         frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
 437
 438         return frag;
 439 }
 440
 441 /* Walk through a list of TLV parameters.  Don't trust the
 442  * individual parameter lengths and instead depend on
 443  * the chunk length to indicate when to stop.  Make sure
 444  * there is room for a param header too.
 445  */
 446 #define sctp_walk_params(pos, chunk, member)\
 447 _sctp_walk_params((pos), (chunk), WORD_ROUND(ntohs((chunk)->chunk_hdr.length)), member)
 448
 449 #define _sctp_walk_params(pos, chunk, end, member)\
 450 for (pos.v = chunk->member;\
 451      pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\
 452      pos.v <= (void *)chunk + end - WORD_ROUND(ntohs(pos.p->length)) &&\
 453      ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
 454      pos.v += WORD_ROUND(ntohs(pos.p->length)))
 455
 456 #define sctp_walk_errors(err, chunk_hdr)\
 457 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
 458
 459 #define _sctp_walk_errors(err, chunk_hdr, end)\
 460 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
 461             sizeof(sctp_chunkhdr_t));\
 462      (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\
 463      (void *)err <= (void *)chunk_hdr + end - WORD_ROUND(ntohs(err->length)) &&\
 464      ntohs(err->length) >= sizeof(sctp_errhdr_t); \
 465      err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
 466
 467 #define sctp_walk_fwdtsn(pos, chunk)\
 468 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
 469
 470 #define _sctp_walk_fwdtsn(pos, chunk, end)\
 471 for (pos = chunk->subh.fwdtsn_hdr->skip;\
 472      (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
 473      pos++)
 474
 475 /* Round an int up to the next multiple of 4.  */
 476 #define WORD_ROUND(s) (((s)+3)&~3)
 477
 478 /* Make a new instance of type.  */
 479 #define t_new(type, flags)      (type *)kmalloc(sizeof(type), flags)
 480
 481 /* Compare two timevals.  */
 482 #define tv_lt(s, t) \
 483    (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
 484
 485 /* Add tv1 to tv2. */
 486 #define TIMEVAL_ADD(tv1, tv2) \
 487 ({ \
 488         suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
 489         time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
 490 \
 491         if (usecs >= 1000000) { \
 492                 usecs -= 1000000; \
 493                 secs++; \
 494         } \
 495         (tv2).tv_sec = secs; \
 496         (tv2).tv_usec = usecs; \
 497 })
 498
 499 /* External references. */
 500
 501 extern struct proto sctp_prot;
 502 extern struct proto sctpv6_prot;
 503 extern struct proc_dir_entry *proc_net_sctp;
 504 void sctp_put_port(struct sock *sk);
 505
 506 extern struct idr sctp_assocs_id;
 507 extern spinlock_t sctp_assocs_id_lock;
 508
 509 /* Static inline functions. */
 510
 511 /* Convert from an IP version number to an Address Family symbol.  */
 512 static inline int ipver2af(__u8 ipver)
 513 {
 514         switch (ipver) {
 515         case 4:
 516                 return  AF_INET;
 517         case 6:
 518                 return AF_INET6;
 519         default:
 520                 return 0;
 521         };
 522 }
 523
 524 /* Convert from an address parameter type to an address family.  */
 525 static inline int param_type2af(__u16 type)
 526 {
 527         switch (type) {
 528         case SCTP_PARAM_IPV4_ADDRESS:
 529                 return  AF_INET;
 530         case SCTP_PARAM_IPV6_ADDRESS:
 531                 return AF_INET6;
 532         default:
 533                 return 0;
 534         };
 535 }
 536
 537 /* Perform some sanity checks. */
 538 static inline int sctp_sanity_check(void)
 539 {
 540         SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
 541                     sizeof(((struct sk_buff *)0)->cb),
 542                     "SCTP: ulpevent does not fit in skb!\n", return 0);
 543
 544         return 1;
 545 }
 546
 547 /* Warning: The following hash functions assume a power of two 'size'. */
 548 /* This is the hash function for the SCTP port hash table. */
 549 static inline int sctp_phashfn(__u16 lport)
 550 {
 551         return (lport & (sctp_port_hashsize - 1));
 552 }
 553
 554 /* This is the hash function for the endpoint hash table. */
 555 static inline int sctp_ep_hashfn(__u16 lport)
 556 {
 557         return (lport & (sctp_ep_hashsize - 1));
 558 }
 559
 560 /* This is the hash function for the association hash table. */
 561 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
 562 {
 563         int h = (lport << 16) + rport;
 564         h ^= h>>8;
 565         return (h & (sctp_assoc_hashsize - 1));
 566 }
 567
 568 /* This is the hash function for the association hash table.  This is
 569  * not used yet, but could be used as a better hash function when
 570  * we have a vtag.
 571  */
 572 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
 573 {
 574         int h = (lport << 16) + rport;
 575         h ^= vtag;
 576         return (h & (sctp_assoc_hashsize-1));
 577 }
 578
 579 /* Is a socket of this style? */
 580 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
 581 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
 582 {
 583         return sctp_sk(sk)->type == style;
 584 }
 585
 586 /* Is the association in this state? */
 587 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
 588 static inline int __sctp_state(const struct sctp_association *asoc,
 589                                sctp_state_t state)
 590 {
 591         return asoc->state == state;
 592 }
 593
 594 /* Is the socket in this state? */
 595 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
 596 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
 597 {
 598         return sk->sk_state == state;
 599 }
 600
 601 /* Map v4-mapped v6 address back to v4 address */
 602 static inline void sctp_v6_map_v4(union sctp_addr *addr)
 603 {
 604         addr->v4.sin_family = AF_INET;
 605         addr->v4.sin_port = addr->v6.sin6_port;
 606         addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
 607 }
 608
 609 /* Map v4 address to v4-mapped v6 address */
 610 static inline void sctp_v4_map_v6(union sctp_addr *addr)
 611 {
 612         addr->v6.sin6_family = AF_INET6;
 613         addr->v6.sin6_port = addr->v4.sin_port;
 614         addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
 615         addr->v6.sin6_addr.s6_addr32[0] = 0;
 616         addr->v6.sin6_addr.s6_addr32[1] = 0;
 617         addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
 618 }
 619
 620 #endif /* __net_sctp_h__ */