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TOMOYO Linux Cross Reference
Linux/include/net/sctp/sctp.h

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  1 /* SCTP kernel 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 implementation
  8  *
  9  * The base lksctp header.
 10  *
 11  * This SCTP 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  * This SCTP 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 #include <linux/types.h>
 66 #include <linux/slab.h>
 67 #include <linux/in.h>
 68 #include <linux/tty.h>
 69 #include <linux/proc_fs.h>
 70 #include <linux/spinlock.h>
 71 #include <linux/jiffies.h>
 72 #include <linux/idr.h>
 73 
 74 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 75 #include <net/ipv6.h>
 76 #include <net/ip6_route.h>
 77 #endif
 78 
 79 #include <asm/uaccess.h>
 80 #include <asm/page.h>
 81 #include <net/sock.h>
 82 #include <net/snmp.h>
 83 #include <net/sctp/structs.h>
 84 #include <net/sctp/constants.h>
 85 
 86 
 87 /* Set SCTP_DEBUG flag via config if not already set. */
 88 #ifndef SCTP_DEBUG
 89 #ifdef CONFIG_SCTP_DBG_MSG
 90 #define SCTP_DEBUG      1
 91 #else
 92 #define SCTP_DEBUG      0
 93 #endif /* CONFIG_SCTP_DBG */
 94 #endif /* SCTP_DEBUG */
 95 
 96 #ifdef CONFIG_IP_SCTP_MODULE
 97 #define SCTP_PROTOSW_FLAG 0
 98 #else /* static! */
 99 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
100 #endif
101 
102 
103 /* Certain internal static functions need to be exported when
104  * compiled into the test frame.
105  */
106 #ifndef SCTP_STATIC
107 #define SCTP_STATIC static
108 #endif
109 
110 /*
111  * Function declarations.
112  */
113 
114 /*
115  * sctp/protocol.c
116  */
117 extern struct sock *sctp_get_ctl_sock(void);
118 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
119                                      sctp_scope_t, gfp_t gfp,
120                                      int flags);
121 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
122 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
123 
124 /*
125  * sctp/socket.c
126  */
127 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
128 int sctp_inet_listen(struct socket *sock, int backlog);
129 void sctp_write_space(struct sock *sk);
130 void sctp_data_ready(struct sock *sk, int len);
131 unsigned int sctp_poll(struct file *file, struct socket *sock,
132                 poll_table *wait);
133 void sctp_sock_rfree(struct sk_buff *skb);
134 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
135                     struct sctp_association *asoc);
136 extern struct percpu_counter sctp_sockets_allocated;
137 
138 /*
139  * sctp/primitive.c
140  */
141 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
142 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
143 int sctp_primitive_ABORT(struct sctp_association *, void *arg);
144 int sctp_primitive_SEND(struct sctp_association *, void *arg);
145 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
146 int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
147 
148 /*
149  * sctp/input.c
150  */
151 int sctp_rcv(struct sk_buff *skb);
152 void sctp_v4_err(struct sk_buff *skb, u32 info);
153 void sctp_hash_established(struct sctp_association *);
154 void sctp_unhash_established(struct sctp_association *);
155 void sctp_hash_endpoint(struct sctp_endpoint *);
156 void sctp_unhash_endpoint(struct sctp_endpoint *);
157 struct sock *sctp_err_lookup(int family, struct sk_buff *,
158                              struct sctphdr *, struct sctp_association **,
159                              struct sctp_transport **);
160 void sctp_err_finish(struct sock *, struct sctp_association *);
161 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
162                            struct sctp_transport *t, __u32 pmtu);
163 void sctp_icmp_proto_unreachable(struct sock *sk,
164                                  struct sctp_association *asoc,
165                                  struct sctp_transport *t);
166 void sctp_backlog_migrate(struct sctp_association *assoc,
167                           struct sock *oldsk, struct sock *newsk);
168 
169 /*
170  * sctp/proc.c
171  */
172 int sctp_snmp_proc_init(void);
173 void sctp_snmp_proc_exit(void);
174 int sctp_eps_proc_init(void);
175 void sctp_eps_proc_exit(void);
176 int sctp_assocs_proc_init(void);
177 void sctp_assocs_proc_exit(void);
178 int sctp_remaddr_proc_init(void);
179 void sctp_remaddr_proc_exit(void);
180 
181 
182 /*
183  * Module global variables
184  */
185 
186  /*
187   * sctp/protocol.c
188   */
189 extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
190 extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
191 
192 /*
193  *  Section:  Macros, externs, and inlines
194  */
195 
196 
197 #ifdef TEST_FRAME
198 #include <test_frame.h>
199 #else
200 
201 /* spin lock wrappers. */
202 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
203 #define sctp_spin_unlock_irqrestore(lock, flags)  \
204        spin_unlock_irqrestore(lock, flags)
205 #define sctp_local_bh_disable() local_bh_disable()
206 #define sctp_local_bh_enable()  local_bh_enable()
207 #define sctp_spin_lock(lock)    spin_lock(lock)
208 #define sctp_spin_unlock(lock)  spin_unlock(lock)
209 #define sctp_write_lock(lock)   write_lock(lock)
210 #define sctp_write_unlock(lock) write_unlock(lock)
211 #define sctp_read_lock(lock)    read_lock(lock)
212 #define sctp_read_unlock(lock)  read_unlock(lock)
213 
214 /* sock lock wrappers. */
215 #define sctp_lock_sock(sk)       lock_sock(sk)
216 #define sctp_release_sock(sk)    release_sock(sk)
217 #define sctp_bh_lock_sock(sk)    bh_lock_sock(sk)
218 #define sctp_bh_unlock_sock(sk)  bh_unlock_sock(sk)
219 
220 /* SCTP SNMP MIB stats handlers */
221 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
222 #define SCTP_INC_STATS(field)      SNMP_INC_STATS(sctp_statistics, field)
223 #define SCTP_INC_STATS_BH(field)   SNMP_INC_STATS_BH(sctp_statistics, field)
224 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
225 #define SCTP_DEC_STATS(field)      SNMP_DEC_STATS(sctp_statistics, field)
226 
227 #endif /* !TEST_FRAME */
228 
229 /* sctp mib definitions */
230 enum {
231         SCTP_MIB_NUM = 0,
232         SCTP_MIB_CURRESTAB,                     /* CurrEstab */
233         SCTP_MIB_ACTIVEESTABS,                  /* ActiveEstabs */
234         SCTP_MIB_PASSIVEESTABS,                 /* PassiveEstabs */
235         SCTP_MIB_ABORTEDS,                      /* Aborteds */
236         SCTP_MIB_SHUTDOWNS,                     /* Shutdowns */
237         SCTP_MIB_OUTOFBLUES,                    /* OutOfBlues */
238         SCTP_MIB_CHECKSUMERRORS,                /* ChecksumErrors */
239         SCTP_MIB_OUTCTRLCHUNKS,                 /* OutCtrlChunks */
240         SCTP_MIB_OUTORDERCHUNKS,                /* OutOrderChunks */
241         SCTP_MIB_OUTUNORDERCHUNKS,              /* OutUnorderChunks */
242         SCTP_MIB_INCTRLCHUNKS,                  /* InCtrlChunks */
243         SCTP_MIB_INORDERCHUNKS,                 /* InOrderChunks */
244         SCTP_MIB_INUNORDERCHUNKS,               /* InUnorderChunks */
245         SCTP_MIB_FRAGUSRMSGS,                   /* FragUsrMsgs */
246         SCTP_MIB_REASMUSRMSGS,                  /* ReasmUsrMsgs */
247         SCTP_MIB_OUTSCTPPACKS,                  /* OutSCTPPacks */
248         SCTP_MIB_INSCTPPACKS,                   /* InSCTPPacks */
249         SCTP_MIB_T1_INIT_EXPIREDS,
250         SCTP_MIB_T1_COOKIE_EXPIREDS,
251         SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
252         SCTP_MIB_T3_RTX_EXPIREDS,
253         SCTP_MIB_T4_RTO_EXPIREDS,
254         SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
255         SCTP_MIB_DELAY_SACK_EXPIREDS,
256         SCTP_MIB_AUTOCLOSE_EXPIREDS,
257         SCTP_MIB_T1_RETRANSMITS,
258         SCTP_MIB_T3_RETRANSMITS,
259         SCTP_MIB_PMTUD_RETRANSMITS,
260         SCTP_MIB_FAST_RETRANSMITS,
261         SCTP_MIB_IN_PKT_SOFTIRQ,
262         SCTP_MIB_IN_PKT_BACKLOG,
263         SCTP_MIB_IN_PKT_DISCARDS,
264         SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
265         __SCTP_MIB_MAX
266 };
267 
268 #define SCTP_MIB_MAX    __SCTP_MIB_MAX
269 struct sctp_mib {
270         unsigned long   mibs[SCTP_MIB_MAX];
271 };
272 
273 
274 /* Print debugging messages.  */
275 #if SCTP_DEBUG
276 extern int sctp_debug_flag;
277 #define SCTP_DEBUG_PRINTK(fmt, args...)                 \
278 do {                                                    \
279         if (sctp_debug_flag)                            \
280                 printk(KERN_DEBUG pr_fmt(fmt), ##args); \
281 } while (0)
282 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...)            \
283 do {                                                    \
284         if (sctp_debug_flag)                            \
285                 pr_cont(fmt, ##args);                   \
286 } while (0)
287 #define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail,                   \
288                                  args_lead, saddr, args_trail...)       \
289 do {                                                                    \
290         if (sctp_debug_flag) {                                          \
291                 if (saddr->sa.sa_family == AF_INET6) {                  \
292                         printk(KERN_DEBUG                               \
293                                pr_fmt(fmt_lead "%pI6" fmt_trail),       \
294                                args_lead,                               \
295                                &saddr->v6.sin6_addr,                    \
296                                args_trail);                             \
297                 } else {                                                \
298                         printk(KERN_DEBUG                               \
299                                pr_fmt(fmt_lead "%pI4" fmt_trail),       \
300                                args_lead,                               \
301                                &saddr->v4.sin_addr.s_addr,              \
302                                args_trail);                             \
303                 }                                                       \
304         }                                                               \
305 } while (0)
306 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
307 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
308 
309 #define SCTP_ASSERT(expr, str, func) \
310         if (!(expr)) { \
311                 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
312                         str, (#expr), __FILE__, __func__, __LINE__); \
313                 func; \
314         }
315 
316 #else   /* SCTP_DEBUG */
317 
318 #define SCTP_DEBUG_PRINTK(whatever...)
319 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
320 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
321 #define SCTP_ENABLE_DEBUG
322 #define SCTP_DISABLE_DEBUG
323 #define SCTP_ASSERT(expr, str, func)
324 
325 #endif /* SCTP_DEBUG */
326 
327 
328 /*
329  * Macros for keeping a global reference of object allocations.
330  */
331 #ifdef CONFIG_SCTP_DBG_OBJCNT
332 
333 extern atomic_t sctp_dbg_objcnt_sock;
334 extern atomic_t sctp_dbg_objcnt_ep;
335 extern atomic_t sctp_dbg_objcnt_assoc;
336 extern atomic_t sctp_dbg_objcnt_transport;
337 extern atomic_t sctp_dbg_objcnt_chunk;
338 extern atomic_t sctp_dbg_objcnt_bind_addr;
339 extern atomic_t sctp_dbg_objcnt_bind_bucket;
340 extern atomic_t sctp_dbg_objcnt_addr;
341 extern atomic_t sctp_dbg_objcnt_ssnmap;
342 extern atomic_t sctp_dbg_objcnt_datamsg;
343 extern atomic_t sctp_dbg_objcnt_keys;
344 
345 /* Macros to atomically increment/decrement objcnt counters.  */
346 #define SCTP_DBG_OBJCNT_INC(name) \
347 atomic_inc(&sctp_dbg_objcnt_## name)
348 #define SCTP_DBG_OBJCNT_DEC(name) \
349 atomic_dec(&sctp_dbg_objcnt_## name)
350 #define SCTP_DBG_OBJCNT(name) \
351 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
352 
353 /* Macro to help create new entries in in the global array of
354  * objcnt counters.
355  */
356 #define SCTP_DBG_OBJCNT_ENTRY(name) \
357 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
358 
359 void sctp_dbg_objcnt_init(void);
360 void sctp_dbg_objcnt_exit(void);
361 
362 #else
363 
364 #define SCTP_DBG_OBJCNT_INC(name)
365 #define SCTP_DBG_OBJCNT_DEC(name)
366 
367 static inline void sctp_dbg_objcnt_init(void) { return; }
368 static inline void sctp_dbg_objcnt_exit(void) { return; }
369 
370 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
371 
372 #if defined CONFIG_SYSCTL
373 void sctp_sysctl_register(void);
374 void sctp_sysctl_unregister(void);
375 #else
376 static inline void sctp_sysctl_register(void) { return; }
377 static inline void sctp_sysctl_unregister(void) { return; }
378 #endif
379 
380 /* Size of Supported Address Parameter for 'x' address types. */
381 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
382 
383 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
384 
385 void sctp_v6_pf_init(void);
386 void sctp_v6_pf_exit(void);
387 int sctp_v6_protosw_init(void);
388 void sctp_v6_protosw_exit(void);
389 int sctp_v6_add_protocol(void);
390 void sctp_v6_del_protocol(void);
391 
392 #else /* #ifdef defined(CONFIG_IPV6) */
393 
394 static inline void sctp_v6_pf_init(void) { return; }
395 static inline void sctp_v6_pf_exit(void) { return; }
396 static inline int sctp_v6_protosw_init(void) { return 0; }
397 static inline void sctp_v6_protosw_exit(void) { return; }
398 static inline int sctp_v6_add_protocol(void) { return 0; }
399 static inline void sctp_v6_del_protocol(void) { return; }
400 
401 #endif /* #if defined(CONFIG_IPV6) */
402 
403 
404 /* Map an association to an assoc_id. */
405 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
406 {
407         return asoc ? asoc->assoc_id : 0;
408 }
409 
410 /* Look up the association by its id.  */
411 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
412 
413 
414 /* A macro to walk a list of skbs.  */
415 #define sctp_skb_for_each(pos, head, tmp) \
416         skb_queue_walk_safe(head, pos, tmp)
417 
418 /* A helper to append an entire skb list (list) to another (head). */
419 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
420                                       struct sk_buff_head *head)
421 {
422         unsigned long flags;
423 
424         sctp_spin_lock_irqsave(&head->lock, flags);
425         sctp_spin_lock(&list->lock);
426 
427         skb_queue_splice_tail_init(list, head);
428 
429         sctp_spin_unlock(&list->lock);
430         sctp_spin_unlock_irqrestore(&head->lock, flags);
431 }
432 
433 /**
434  *      sctp_list_dequeue - remove from the head of the queue
435  *      @list: list to dequeue from
436  *
437  *      Remove the head of the list. The head item is
438  *      returned or %NULL if the list is empty.
439  */
440 
441 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
442 {
443         struct list_head *result = NULL;
444 
445         if (list->next != list) {
446                 result = list->next;
447                 list->next = result->next;
448                 list->next->prev = list;
449                 INIT_LIST_HEAD(result);
450         }
451         return result;
452 }
453 
454 /* SCTP version of skb_set_owner_r.  We need this one because
455  * of the way we have to do receive buffer accounting on bundled
456  * chunks.
457  */
458 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
459 {
460         struct sctp_ulpevent *event = sctp_skb2event(skb);
461 
462         skb_orphan(skb);
463         skb->sk = sk;
464         skb->destructor = sctp_sock_rfree;
465         atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
466         /*
467          * This mimics the behavior of skb_set_owner_r
468          */
469         sk->sk_forward_alloc -= event->rmem_len;
470 }
471 
472 /* Tests if the list has one and only one entry. */
473 static inline int sctp_list_single_entry(struct list_head *head)
474 {
475         return (head->next != head) && (head->next == head->prev);
476 }
477 
478 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
479 static inline __s32 sctp_jitter(__u32 rto)
480 {
481         static __u32 sctp_rand;
482         __s32 ret;
483 
484         /* Avoid divide by zero. */
485         if (!rto)
486                 rto = 1;
487 
488         sctp_rand += jiffies;
489         sctp_rand ^= (sctp_rand << 12);
490         sctp_rand ^= (sctp_rand >> 20);
491 
492         /* Choose random number from 0 to rto, then move to -50% ~ +50%
493          * of rto.
494          */
495         ret = sctp_rand % rto - (rto >> 1);
496         return ret;
497 }
498 
499 /* Break down data chunks at this point.  */
500 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
501 {
502         struct sctp_sock *sp = sctp_sk(asoc->base.sk);
503         int frag = pmtu;
504 
505         frag -= sp->pf->af->net_header_len;
506         frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
507 
508         if (asoc->user_frag)
509                 frag = min_t(int, frag, asoc->user_frag);
510 
511         frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
512 
513         return frag;
514 }
515 
516 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc)
517 {
518 
519         sctp_assoc_sync_pmtu(asoc);
520         asoc->pmtu_pending = 0;
521 }
522 
523 /* Walk through a list of TLV parameters.  Don't trust the
524  * individual parameter lengths and instead depend on
525  * the chunk length to indicate when to stop.  Make sure
526  * there is room for a param header too.
527  */
528 #define sctp_walk_params(pos, chunk, member)\
529 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
530 
531 #define _sctp_walk_params(pos, chunk, end, member)\
532 for (pos.v = chunk->member;\
533      pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
534      ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
535      pos.v += WORD_ROUND(ntohs(pos.p->length)))
536 
537 #define sctp_walk_errors(err, chunk_hdr)\
538 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
539 
540 #define _sctp_walk_errors(err, chunk_hdr, end)\
541 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
542             sizeof(sctp_chunkhdr_t));\
543      (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
544      ntohs(err->length) >= sizeof(sctp_errhdr_t); \
545      err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
546 
547 #define sctp_walk_fwdtsn(pos, chunk)\
548 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
549 
550 #define _sctp_walk_fwdtsn(pos, chunk, end)\
551 for (pos = chunk->subh.fwdtsn_hdr->skip;\
552      (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
553      pos++)
554 
555 /* Round an int up to the next multiple of 4.  */
556 #define WORD_ROUND(s) (((s)+3)&~3)
557 
558 /* Make a new instance of type.  */
559 #define t_new(type, flags)      (type *)kzalloc(sizeof(type), flags)
560 
561 /* Compare two timevals.  */
562 #define tv_lt(s, t) \
563    (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
564 
565 /* Add tv1 to tv2. */
566 #define TIMEVAL_ADD(tv1, tv2) \
567 ({ \
568         suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
569         time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
570 \
571         if (usecs >= 1000000) { \
572                 usecs -= 1000000; \
573                 secs++; \
574         } \
575         (tv2).tv_sec = secs; \
576         (tv2).tv_usec = usecs; \
577 })
578 
579 /* External references. */
580 
581 extern struct proto sctp_prot;
582 extern struct proto sctpv6_prot;
583 extern struct proc_dir_entry *proc_net_sctp;
584 void sctp_put_port(struct sock *sk);
585 
586 extern struct idr sctp_assocs_id;
587 extern spinlock_t sctp_assocs_id_lock;
588 
589 /* Static inline functions. */
590 
591 /* Convert from an IP version number to an Address Family symbol.  */
592 static inline int ipver2af(__u8 ipver)
593 {
594         switch (ipver) {
595         case 4:
596                 return  AF_INET;
597         case 6:
598                 return AF_INET6;
599         default:
600                 return 0;
601         };
602 }
603 
604 /* Convert from an address parameter type to an address family.  */
605 static inline int param_type2af(__be16 type)
606 {
607         switch (type) {
608         case SCTP_PARAM_IPV4_ADDRESS:
609                 return  AF_INET;
610         case SCTP_PARAM_IPV6_ADDRESS:
611                 return AF_INET6;
612         default:
613                 return 0;
614         };
615 }
616 
617 /* Perform some sanity checks. */
618 static inline int sctp_sanity_check(void)
619 {
620         SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
621                     sizeof(((struct sk_buff *)0)->cb),
622                     "SCTP: ulpevent does not fit in skb!\n", return 0);
623 
624         return 1;
625 }
626 
627 /* Warning: The following hash functions assume a power of two 'size'. */
628 /* This is the hash function for the SCTP port hash table. */
629 static inline int sctp_phashfn(__u16 lport)
630 {
631         return lport & (sctp_port_hashsize - 1);
632 }
633 
634 /* This is the hash function for the endpoint hash table. */
635 static inline int sctp_ep_hashfn(__u16 lport)
636 {
637         return lport & (sctp_ep_hashsize - 1);
638 }
639 
640 /* This is the hash function for the association hash table. */
641 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
642 {
643         int h = (lport << 16) + rport;
644         h ^= h>>8;
645         return h & (sctp_assoc_hashsize - 1);
646 }
647 
648 /* This is the hash function for the association hash table.  This is
649  * not used yet, but could be used as a better hash function when
650  * we have a vtag.
651  */
652 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
653 {
654         int h = (lport << 16) + rport;
655         h ^= vtag;
656         return h & (sctp_assoc_hashsize - 1);
657 }
658 
659 #define sctp_for_each_hentry(epb, node, head) \
660         hlist_for_each_entry(epb, node, head, node)
661 
662 /* Is a socket of this style? */
663 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
664 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
665 {
666         return sctp_sk(sk)->type == style;
667 }
668 
669 /* Is the association in this state? */
670 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
671 static inline int __sctp_state(const struct sctp_association *asoc,
672                                sctp_state_t state)
673 {
674         return asoc->state == state;
675 }
676 
677 /* Is the socket in this state? */
678 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
679 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
680 {
681         return sk->sk_state == state;
682 }
683 
684 /* Map v4-mapped v6 address back to v4 address */
685 static inline void sctp_v6_map_v4(union sctp_addr *addr)
686 {
687         addr->v4.sin_family = AF_INET;
688         addr->v4.sin_port = addr->v6.sin6_port;
689         addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
690 }
691 
692 /* Map v4 address to v4-mapped v6 address */
693 static inline void sctp_v4_map_v6(union sctp_addr *addr)
694 {
695         addr->v6.sin6_family = AF_INET6;
696         addr->v6.sin6_port = addr->v4.sin_port;
697         addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
698         addr->v6.sin6_addr.s6_addr32[0] = 0;
699         addr->v6.sin6_addr.s6_addr32[1] = 0;
700         addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
701 }
702 
703 /* The cookie is always 0 since this is how it's used in the
704  * pmtu code.
705  */
706 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
707 {
708         if (t->dst && !dst_check(t->dst, 0)) {
709                 dst_release(t->dst);
710                 t->dst = NULL;
711         }
712 
713         return t->dst;
714 }
715 
716 #endif /* __net_sctp_h__ */
717 

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