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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 */
117extern struct sock *sctp_get_ctl_sock(void);
118extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
119 sctp_scope_t, gfp_t gfp,
120 int flags);
121extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
122extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
123extern void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *, int);
124
125/*
126 * sctp/socket.c
127 */
128int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
129int sctp_inet_listen(struct socket *sock, int backlog);
130void sctp_write_space(struct sock *sk);
131void sctp_data_ready(struct sock *sk, int len);
132unsigned int sctp_poll(struct file *file, struct socket *sock,
133 poll_table *wait);
134void sctp_sock_rfree(struct sk_buff *skb);
135void sctp_copy_sock(struct sock *newsk, struct sock *sk,
136 struct sctp_association *asoc);
137extern struct percpu_counter sctp_sockets_allocated;
138extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
139
140/*
141 * sctp/primitive.c
142 */
143int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
144int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
145int sctp_primitive_ABORT(struct sctp_association *, void *arg);
146int sctp_primitive_SEND(struct sctp_association *, void *arg);
147int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
148int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
149
150/*
151 * sctp/input.c
152 */
153int sctp_rcv(struct sk_buff *skb);
154void sctp_v4_err(struct sk_buff *skb, u32 info);
155void sctp_hash_established(struct sctp_association *);
156void sctp_unhash_established(struct sctp_association *);
157void sctp_hash_endpoint(struct sctp_endpoint *);
158void sctp_unhash_endpoint(struct sctp_endpoint *);
159struct sock *sctp_err_lookup(int family, struct sk_buff *,
160 struct sctphdr *, struct sctp_association **,
161 struct sctp_transport **);
162void sctp_err_finish(struct sock *, struct sctp_association *);
163void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
164 struct sctp_transport *t, __u32 pmtu);
165void sctp_icmp_proto_unreachable(struct sock *sk,
166 struct sctp_association *asoc,
167 struct sctp_transport *t);
168void sctp_backlog_migrate(struct sctp_association *assoc,
169 struct sock *oldsk, struct sock *newsk);
170
171/*
172 * sctp/proc.c
173 */
174int sctp_snmp_proc_init(void);
175void sctp_snmp_proc_exit(void);
176int sctp_eps_proc_init(void);
177void sctp_eps_proc_exit(void);
178int sctp_assocs_proc_init(void);
179void sctp_assocs_proc_exit(void);
180int sctp_remaddr_proc_init(void);
181void sctp_remaddr_proc_exit(void);
182
183
184/*
185 * Module global variables
186 */
187
188 /*
189 * sctp/protocol.c
190 */
191extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
192extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
193
194/*
195 * Section: Macros, externs, and inlines
196 */
197
198
199#ifdef TEST_FRAME
200#include <test_frame.h>
201#else
202
203/* spin lock wrappers. */
204#define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
205#define sctp_spin_unlock_irqrestore(lock, flags) \
206 spin_unlock_irqrestore(lock, flags)
207#define sctp_local_bh_disable() local_bh_disable()
208#define sctp_local_bh_enable() local_bh_enable()
209#define sctp_spin_lock(lock) spin_lock(lock)
210#define sctp_spin_unlock(lock) spin_unlock(lock)
211#define sctp_write_lock(lock) write_lock(lock)
212#define sctp_write_unlock(lock) write_unlock(lock)
213#define sctp_read_lock(lock) read_lock(lock)
214#define sctp_read_unlock(lock) read_unlock(lock)
215
216/* sock lock wrappers. */
217#define sctp_lock_sock(sk) lock_sock(sk)
218#define sctp_release_sock(sk) release_sock(sk)
219#define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
220#define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
221
222/* SCTP SNMP MIB stats handlers */
223DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
224#define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field)
225#define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field)
226#define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
227#define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field)
228
229#endif /* !TEST_FRAME */
230
231/* sctp mib definitions */
232enum {
233 SCTP_MIB_NUM = 0,
234 SCTP_MIB_CURRESTAB, /* CurrEstab */
235 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
236 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
237 SCTP_MIB_ABORTEDS, /* Aborteds */
238 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
239 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
240 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
241 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
242 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
243 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
244 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
245 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
246 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
247 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
248 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
249 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
250 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
251 SCTP_MIB_T1_INIT_EXPIREDS,
252 SCTP_MIB_T1_COOKIE_EXPIREDS,
253 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
254 SCTP_MIB_T3_RTX_EXPIREDS,
255 SCTP_MIB_T4_RTO_EXPIREDS,
256 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
257 SCTP_MIB_DELAY_SACK_EXPIREDS,
258 SCTP_MIB_AUTOCLOSE_EXPIREDS,
259 SCTP_MIB_T1_RETRANSMITS,
260 SCTP_MIB_T3_RETRANSMITS,
261 SCTP_MIB_PMTUD_RETRANSMITS,
262 SCTP_MIB_FAST_RETRANSMITS,
263 SCTP_MIB_IN_PKT_SOFTIRQ,
264 SCTP_MIB_IN_PKT_BACKLOG,
265 SCTP_MIB_IN_PKT_DISCARDS,
266 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
267 __SCTP_MIB_MAX
268};
269
270#define SCTP_MIB_MAX __SCTP_MIB_MAX
271struct sctp_mib {
272 unsigned long mibs[SCTP_MIB_MAX];
273};
274
275
276/* Print debugging messages. */
277#if SCTP_DEBUG
278extern int sctp_debug_flag;
279#define SCTP_DEBUG_PRINTK(fmt, args...) \
280do { \
281 if (sctp_debug_flag) \
282 printk(KERN_DEBUG pr_fmt(fmt), ##args); \
283} while (0)
284#define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \
285do { \
286 if (sctp_debug_flag) \
287 pr_cont(fmt, ##args); \
288} while (0)
289#define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \
290 args_lead, addr, args_trail...) \
291do { \
292 const union sctp_addr *_addr = (addr); \
293 if (sctp_debug_flag) { \
294 if (_addr->sa.sa_family == AF_INET6) { \
295 printk(KERN_DEBUG \
296 pr_fmt(fmt_lead "%pI6" fmt_trail), \
297 args_lead, \
298 &_addr->v6.sin6_addr, \
299 args_trail); \
300 } else { \
301 printk(KERN_DEBUG \
302 pr_fmt(fmt_lead "%pI4" fmt_trail), \
303 args_lead, \
304 &_addr->v4.sin_addr.s_addr, \
305 args_trail); \
306 } \
307 } \
308} while (0)
309#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
310#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
311
312#define SCTP_ASSERT(expr, str, func) \
313 if (!(expr)) { \
314 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
315 str, (#expr), __FILE__, __func__, __LINE__); \
316 func; \
317 }
318
319#else /* SCTP_DEBUG */
320
321#define SCTP_DEBUG_PRINTK(whatever...)
322#define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
323#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
324#define SCTP_ENABLE_DEBUG
325#define SCTP_DISABLE_DEBUG
326#define SCTP_ASSERT(expr, str, func)
327
328#endif /* SCTP_DEBUG */
329
330
331/*
332 * Macros for keeping a global reference of object allocations.
333 */
334#ifdef CONFIG_SCTP_DBG_OBJCNT
335
336extern atomic_t sctp_dbg_objcnt_sock;
337extern atomic_t sctp_dbg_objcnt_ep;
338extern atomic_t sctp_dbg_objcnt_assoc;
339extern atomic_t sctp_dbg_objcnt_transport;
340extern atomic_t sctp_dbg_objcnt_chunk;
341extern atomic_t sctp_dbg_objcnt_bind_addr;
342extern atomic_t sctp_dbg_objcnt_bind_bucket;
343extern atomic_t sctp_dbg_objcnt_addr;
344extern atomic_t sctp_dbg_objcnt_ssnmap;
345extern atomic_t sctp_dbg_objcnt_datamsg;
346extern atomic_t sctp_dbg_objcnt_keys;
347
348/* Macros to atomically increment/decrement objcnt counters. */
349#define SCTP_DBG_OBJCNT_INC(name) \
350atomic_inc(&sctp_dbg_objcnt_## name)
351#define SCTP_DBG_OBJCNT_DEC(name) \
352atomic_dec(&sctp_dbg_objcnt_## name)
353#define SCTP_DBG_OBJCNT(name) \
354atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
355
356/* Macro to help create new entries in in the global array of
357 * objcnt counters.
358 */
359#define SCTP_DBG_OBJCNT_ENTRY(name) \
360{.label= #name, .counter= &sctp_dbg_objcnt_## name}
361
362void sctp_dbg_objcnt_init(void);
363void sctp_dbg_objcnt_exit(void);
364
365#else
366
367#define SCTP_DBG_OBJCNT_INC(name)
368#define SCTP_DBG_OBJCNT_DEC(name)
369
370static inline void sctp_dbg_objcnt_init(void) { return; }
371static inline void sctp_dbg_objcnt_exit(void) { return; }
372
373#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
374
375#if defined CONFIG_SYSCTL
376void sctp_sysctl_register(void);
377void sctp_sysctl_unregister(void);
378#else
379static inline void sctp_sysctl_register(void) { return; }
380static inline void sctp_sysctl_unregister(void) { return; }
381#endif
382
383/* Size of Supported Address Parameter for 'x' address types. */
384#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
385
386#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
387
388void sctp_v6_pf_init(void);
389void sctp_v6_pf_exit(void);
390int sctp_v6_protosw_init(void);
391void sctp_v6_protosw_exit(void);
392int sctp_v6_add_protocol(void);
393void sctp_v6_del_protocol(void);
394
395#else /* #ifdef defined(CONFIG_IPV6) */
396
397static inline void sctp_v6_pf_init(void) { return; }
398static inline void sctp_v6_pf_exit(void) { return; }
399static inline int sctp_v6_protosw_init(void) { return 0; }
400static inline void sctp_v6_protosw_exit(void) { return; }
401static inline int sctp_v6_add_protocol(void) { return 0; }
402static inline void sctp_v6_del_protocol(void) { return; }
403
404#endif /* #if defined(CONFIG_IPV6) */
405
406
407/* Map an association to an assoc_id. */
408static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
409{
410 return asoc ? asoc->assoc_id : 0;
411}
412
413/* Look up the association by its id. */
414struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
415
416
417/* A macro to walk a list of skbs. */
418#define sctp_skb_for_each(pos, head, tmp) \
419 skb_queue_walk_safe(head, pos, tmp)
420
421/* A helper to append an entire skb list (list) to another (head). */
422static inline void sctp_skb_list_tail(struct sk_buff_head *list,
423 struct sk_buff_head *head)
424{
425 unsigned long flags;
426
427 sctp_spin_lock_irqsave(&head->lock, flags);
428 sctp_spin_lock(&list->lock);
429
430 skb_queue_splice_tail_init(list, head);
431
432 sctp_spin_unlock(&list->lock);
433 sctp_spin_unlock_irqrestore(&head->lock, flags);
434}
435
436/**
437 * sctp_list_dequeue - remove from the head of the queue
438 * @list: list to dequeue from
439 *
440 * Remove the head of the list. The head item is
441 * returned or %NULL if the list is empty.
442 */
443
444static inline struct list_head *sctp_list_dequeue(struct list_head *list)
445{
446 struct list_head *result = NULL;
447
448 if (list->next != list) {
449 result = list->next;
450 list->next = result->next;
451 list->next->prev = list;
452 INIT_LIST_HEAD(result);
453 }
454 return result;
455}
456
457/* SCTP version of skb_set_owner_r. We need this one because
458 * of the way we have to do receive buffer accounting on bundled
459 * chunks.
460 */
461static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
462{
463 struct sctp_ulpevent *event = sctp_skb2event(skb);
464
465 skb_orphan(skb);
466 skb->sk = sk;
467 skb->destructor = sctp_sock_rfree;
468 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
469 /*
470 * This mimics the behavior of skb_set_owner_r
471 */
472 sk->sk_forward_alloc -= event->rmem_len;
473}
474
475/* Tests if the list has one and only one entry. */
476static inline int sctp_list_single_entry(struct list_head *head)
477{
478 return (head->next != head) && (head->next == head->prev);
479}
480
481/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
482static inline __s32 sctp_jitter(__u32 rto)
483{
484 static __u32 sctp_rand;
485 __s32 ret;
486
487 /* Avoid divide by zero. */
488 if (!rto)
489 rto = 1;
490
491 sctp_rand += jiffies;
492 sctp_rand ^= (sctp_rand << 12);
493 sctp_rand ^= (sctp_rand >> 20);
494
495 /* Choose random number from 0 to rto, then move to -50% ~ +50%
496 * of rto.
497 */
498 ret = sctp_rand % rto - (rto >> 1);
499 return ret;
500}
501
502/* Break down data chunks at this point. */
503static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
504{
505 struct sctp_sock *sp = sctp_sk(asoc->base.sk);
506 int frag = pmtu;
507
508 frag -= sp->pf->af->net_header_len;
509 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
510
511 if (asoc->user_frag)
512 frag = min_t(int, frag, asoc->user_frag);
513
514 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
515
516 return frag;
517}
518
519static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc)
520{
521
522 sctp_assoc_sync_pmtu(asoc);
523 asoc->pmtu_pending = 0;
524}
525
526/* Walk through a list of TLV parameters. Don't trust the
527 * individual parameter lengths and instead depend on
528 * the chunk length to indicate when to stop. Make sure
529 * there is room for a param header too.
530 */
531#define sctp_walk_params(pos, chunk, member)\
532_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
533
534#define _sctp_walk_params(pos, chunk, end, member)\
535for (pos.v = chunk->member;\
536 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
537 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
538 pos.v += WORD_ROUND(ntohs(pos.p->length)))
539
540#define sctp_walk_errors(err, chunk_hdr)\
541_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
542
543#define _sctp_walk_errors(err, chunk_hdr, end)\
544for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
545 sizeof(sctp_chunkhdr_t));\
546 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
547 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
548 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
549
550#define sctp_walk_fwdtsn(pos, chunk)\
551_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
552
553#define _sctp_walk_fwdtsn(pos, chunk, end)\
554for (pos = chunk->subh.fwdtsn_hdr->skip;\
555 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
556 pos++)
557
558/* Round an int up to the next multiple of 4. */
559#define WORD_ROUND(s) (((s)+3)&~3)
560
561/* Make a new instance of type. */
562#define t_new(type, flags) (type *)kzalloc(sizeof(type), flags)
563
564/* Compare two timevals. */
565#define tv_lt(s, t) \
566 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
567
568/* Add tv1 to tv2. */
569#define TIMEVAL_ADD(tv1, tv2) \
570({ \
571 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
572 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
573\
574 if (usecs >= 1000000) { \
575 usecs -= 1000000; \
576 secs++; \
577 } \
578 (tv2).tv_sec = secs; \
579 (tv2).tv_usec = usecs; \
580})
581
582/* External references. */
583
584extern struct proto sctp_prot;
585extern struct proto sctpv6_prot;
586extern struct proc_dir_entry *proc_net_sctp;
587void sctp_put_port(struct sock *sk);
588
589extern struct idr sctp_assocs_id;
590extern spinlock_t sctp_assocs_id_lock;
591
592/* Static inline functions. */
593
594/* Convert from an IP version number to an Address Family symbol. */
595static inline int ipver2af(__u8 ipver)
596{
597 switch (ipver) {
598 case 4:
599 return AF_INET;
600 case 6:
601 return AF_INET6;
602 default:
603 return 0;
604 }
605}
606
607/* Convert from an address parameter type to an address family. */
608static inline int param_type2af(__be16 type)
609{
610 switch (type) {
611 case SCTP_PARAM_IPV4_ADDRESS:
612 return AF_INET;
613 case SCTP_PARAM_IPV6_ADDRESS:
614 return AF_INET6;
615 default:
616 return 0;
617 }
618}
619
620/* Perform some sanity checks. */
621static inline int sctp_sanity_check(void)
622{
623 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
624 sizeof(((struct sk_buff *)0)->cb),
625 "SCTP: ulpevent does not fit in skb!\n", return 0);
626
627 return 1;
628}
629
630/* Warning: The following hash functions assume a power of two 'size'. */
631/* This is the hash function for the SCTP port hash table. */
632static inline int sctp_phashfn(__u16 lport)
633{
634 return lport & (sctp_port_hashsize - 1);
635}
636
637/* This is the hash function for the endpoint hash table. */
638static inline int sctp_ep_hashfn(__u16 lport)
639{
640 return lport & (sctp_ep_hashsize - 1);
641}
642
643/* This is the hash function for the association hash table. */
644static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
645{
646 int h = (lport << 16) + rport;
647 h ^= h>>8;
648 return h & (sctp_assoc_hashsize - 1);
649}
650
651/* This is the hash function for the association hash table. This is
652 * not used yet, but could be used as a better hash function when
653 * we have a vtag.
654 */
655static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
656{
657 int h = (lport << 16) + rport;
658 h ^= vtag;
659 return h & (sctp_assoc_hashsize - 1);
660}
661
662#define sctp_for_each_hentry(epb, node, head) \
663 hlist_for_each_entry(epb, node, head, node)
664
665/* Is a socket of this style? */
666#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
667static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
668{
669 return sctp_sk(sk)->type == style;
670}
671
672/* Is the association in this state? */
673#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
674static inline int __sctp_state(const struct sctp_association *asoc,
675 sctp_state_t state)
676{
677 return asoc->state == state;
678}
679
680/* Is the socket in this state? */
681#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
682static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
683{
684 return sk->sk_state == state;
685}
686
687/* Map v4-mapped v6 address back to v4 address */
688static inline void sctp_v6_map_v4(union sctp_addr *addr)
689{
690 addr->v4.sin_family = AF_INET;
691 addr->v4.sin_port = addr->v6.sin6_port;
692 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
693}
694
695/* Map v4 address to v4-mapped v6 address */
696static inline void sctp_v4_map_v6(union sctp_addr *addr)
697{
698 addr->v6.sin6_family = AF_INET6;
699 addr->v6.sin6_port = addr->v4.sin_port;
700 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
701 addr->v6.sin6_addr.s6_addr32[0] = 0;
702 addr->v6.sin6_addr.s6_addr32[1] = 0;
703 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
704}
705
706#endif /* __net_sctp_h__ */
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, see
25 * <http://www.gnu.org/licenses/>.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 * lksctp developers <linux-sctp@vger.kernel.org>
30 *
31 * Written or modified by:
32 * La Monte H.P. Yarroll <piggy@acm.org>
33 * Xingang Guo <xingang.guo@intel.com>
34 * Jon Grimm <jgrimm@us.ibm.com>
35 * Daisy Chang <daisyc@us.ibm.com>
36 * Sridhar Samudrala <sri@us.ibm.com>
37 * Ardelle Fan <ardelle.fan@intel.com>
38 * Ryan Layer <rmlayer@us.ibm.com>
39 * Kevin Gao <kevin.gao@intel.com>
40 */
41
42#ifndef __net_sctp_h__
43#define __net_sctp_h__
44
45/* Header Strategy.
46 * Start getting some control over the header file depencies:
47 * includes
48 * constants
49 * structs
50 * prototypes
51 * macros, externs, and inlines
52 *
53 * Move test_frame specific items out of the kernel headers
54 * and into the test frame headers. This is not perfect in any sense
55 * and will continue to evolve.
56 */
57
58#include <linux/types.h>
59#include <linux/slab.h>
60#include <linux/in.h>
61#include <linux/tty.h>
62#include <linux/proc_fs.h>
63#include <linux/spinlock.h>
64#include <linux/jiffies.h>
65#include <linux/idr.h>
66
67#if IS_ENABLED(CONFIG_IPV6)
68#include <net/ipv6.h>
69#include <net/ip6_route.h>
70#endif
71
72#include <asm/uaccess.h>
73#include <asm/page.h>
74#include <net/sock.h>
75#include <net/snmp.h>
76#include <net/sctp/structs.h>
77#include <net/sctp/constants.h>
78
79#ifdef CONFIG_IP_SCTP_MODULE
80#define SCTP_PROTOSW_FLAG 0
81#else /* static! */
82#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
83#endif
84
85/*
86 * Function declarations.
87 */
88
89/*
90 * sctp/protocol.c
91 */
92int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *,
93 sctp_scope_t, gfp_t gfp, int flags);
94struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
95int sctp_register_pf(struct sctp_pf *, sa_family_t);
96void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int);
97
98/*
99 * sctp/socket.c
100 */
101int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
102int sctp_inet_listen(struct socket *sock, int backlog);
103void sctp_write_space(struct sock *sk);
104void sctp_data_ready(struct sock *sk);
105unsigned int sctp_poll(struct file *file, struct socket *sock,
106 poll_table *wait);
107void sctp_sock_rfree(struct sk_buff *skb);
108void sctp_copy_sock(struct sock *newsk, struct sock *sk,
109 struct sctp_association *asoc);
110extern struct percpu_counter sctp_sockets_allocated;
111int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
112
113/*
114 * sctp/primitive.c
115 */
116int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg);
117int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg);
118int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg);
119int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg);
120int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg);
121int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg);
122
123/*
124 * sctp/input.c
125 */
126int sctp_rcv(struct sk_buff *skb);
127void sctp_v4_err(struct sk_buff *skb, u32 info);
128void sctp_hash_established(struct sctp_association *);
129void sctp_unhash_established(struct sctp_association *);
130void sctp_hash_endpoint(struct sctp_endpoint *);
131void sctp_unhash_endpoint(struct sctp_endpoint *);
132struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
133 struct sctphdr *, struct sctp_association **,
134 struct sctp_transport **);
135void sctp_err_finish(struct sock *, struct sctp_association *);
136void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
137 struct sctp_transport *t, __u32 pmtu);
138void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
139 struct sk_buff *);
140void sctp_icmp_proto_unreachable(struct sock *sk,
141 struct sctp_association *asoc,
142 struct sctp_transport *t);
143void sctp_backlog_migrate(struct sctp_association *assoc,
144 struct sock *oldsk, struct sock *newsk);
145
146/*
147 * sctp/proc.c
148 */
149int sctp_snmp_proc_init(struct net *net);
150void sctp_snmp_proc_exit(struct net *net);
151int sctp_eps_proc_init(struct net *net);
152void sctp_eps_proc_exit(struct net *net);
153int sctp_assocs_proc_init(struct net *net);
154void sctp_assocs_proc_exit(struct net *net);
155int sctp_remaddr_proc_init(struct net *net);
156void sctp_remaddr_proc_exit(struct net *net);
157
158
159/*
160 * Module global variables
161 */
162
163 /*
164 * sctp/protocol.c
165 */
166extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
167extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
168
169/*
170 * Section: Macros, externs, and inlines
171 */
172
173/* SCTP SNMP MIB stats handlers */
174#define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
175#define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field)
176#define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field)
177#define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
178
179/* sctp mib definitions */
180enum {
181 SCTP_MIB_NUM = 0,
182 SCTP_MIB_CURRESTAB, /* CurrEstab */
183 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
184 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
185 SCTP_MIB_ABORTEDS, /* Aborteds */
186 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
187 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
188 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
189 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
190 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
191 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
192 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
193 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
194 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
195 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
196 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
197 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
198 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
199 SCTP_MIB_T1_INIT_EXPIREDS,
200 SCTP_MIB_T1_COOKIE_EXPIREDS,
201 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
202 SCTP_MIB_T3_RTX_EXPIREDS,
203 SCTP_MIB_T4_RTO_EXPIREDS,
204 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
205 SCTP_MIB_DELAY_SACK_EXPIREDS,
206 SCTP_MIB_AUTOCLOSE_EXPIREDS,
207 SCTP_MIB_T1_RETRANSMITS,
208 SCTP_MIB_T3_RETRANSMITS,
209 SCTP_MIB_PMTUD_RETRANSMITS,
210 SCTP_MIB_FAST_RETRANSMITS,
211 SCTP_MIB_IN_PKT_SOFTIRQ,
212 SCTP_MIB_IN_PKT_BACKLOG,
213 SCTP_MIB_IN_PKT_DISCARDS,
214 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
215 __SCTP_MIB_MAX
216};
217
218#define SCTP_MIB_MAX __SCTP_MIB_MAX
219struct sctp_mib {
220 unsigned long mibs[SCTP_MIB_MAX];
221};
222
223/* helper function to track stats about max rto and related transport */
224static inline void sctp_max_rto(struct sctp_association *asoc,
225 struct sctp_transport *trans)
226{
227 if (asoc->stats.max_obs_rto < (__u64)trans->rto) {
228 asoc->stats.max_obs_rto = trans->rto;
229 memset(&asoc->stats.obs_rto_ipaddr, 0,
230 sizeof(struct sockaddr_storage));
231 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr,
232 trans->af_specific->sockaddr_len);
233 }
234}
235
236/*
237 * Macros for keeping a global reference of object allocations.
238 */
239#ifdef CONFIG_SCTP_DBG_OBJCNT
240
241extern atomic_t sctp_dbg_objcnt_sock;
242extern atomic_t sctp_dbg_objcnt_ep;
243extern atomic_t sctp_dbg_objcnt_assoc;
244extern atomic_t sctp_dbg_objcnt_transport;
245extern atomic_t sctp_dbg_objcnt_chunk;
246extern atomic_t sctp_dbg_objcnt_bind_addr;
247extern atomic_t sctp_dbg_objcnt_bind_bucket;
248extern atomic_t sctp_dbg_objcnt_addr;
249extern atomic_t sctp_dbg_objcnt_ssnmap;
250extern atomic_t sctp_dbg_objcnt_datamsg;
251extern atomic_t sctp_dbg_objcnt_keys;
252
253/* Macros to atomically increment/decrement objcnt counters. */
254#define SCTP_DBG_OBJCNT_INC(name) \
255atomic_inc(&sctp_dbg_objcnt_## name)
256#define SCTP_DBG_OBJCNT_DEC(name) \
257atomic_dec(&sctp_dbg_objcnt_## name)
258#define SCTP_DBG_OBJCNT(name) \
259atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
260
261/* Macro to help create new entries in in the global array of
262 * objcnt counters.
263 */
264#define SCTP_DBG_OBJCNT_ENTRY(name) \
265{.label= #name, .counter= &sctp_dbg_objcnt_## name}
266
267void sctp_dbg_objcnt_init(struct net *);
268void sctp_dbg_objcnt_exit(struct net *);
269
270#else
271
272#define SCTP_DBG_OBJCNT_INC(name)
273#define SCTP_DBG_OBJCNT_DEC(name)
274
275static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
276static inline void sctp_dbg_objcnt_exit(struct net *net) { return; }
277
278#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
279
280#if defined CONFIG_SYSCTL
281void sctp_sysctl_register(void);
282void sctp_sysctl_unregister(void);
283int sctp_sysctl_net_register(struct net *net);
284void sctp_sysctl_net_unregister(struct net *net);
285#else
286static inline void sctp_sysctl_register(void) { return; }
287static inline void sctp_sysctl_unregister(void) { return; }
288static inline int sctp_sysctl_net_register(struct net *net) { return 0; }
289static inline void sctp_sysctl_net_unregister(struct net *net) { return; }
290#endif
291
292/* Size of Supported Address Parameter for 'x' address types. */
293#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
294
295#if IS_ENABLED(CONFIG_IPV6)
296
297void sctp_v6_pf_init(void);
298void sctp_v6_pf_exit(void);
299int sctp_v6_protosw_init(void);
300void sctp_v6_protosw_exit(void);
301int sctp_v6_add_protocol(void);
302void sctp_v6_del_protocol(void);
303
304#else /* #ifdef defined(CONFIG_IPV6) */
305
306static inline void sctp_v6_pf_init(void) { return; }
307static inline void sctp_v6_pf_exit(void) { return; }
308static inline int sctp_v6_protosw_init(void) { return 0; }
309static inline void sctp_v6_protosw_exit(void) { return; }
310static inline int sctp_v6_add_protocol(void) { return 0; }
311static inline void sctp_v6_del_protocol(void) { return; }
312
313#endif /* #if defined(CONFIG_IPV6) */
314
315
316/* Map an association to an assoc_id. */
317static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
318{
319 return asoc ? asoc->assoc_id : 0;
320}
321
322/* Look up the association by its id. */
323struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
324
325int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
326
327/* A macro to walk a list of skbs. */
328#define sctp_skb_for_each(pos, head, tmp) \
329 skb_queue_walk_safe(head, pos, tmp)
330
331/* A helper to append an entire skb list (list) to another (head). */
332static inline void sctp_skb_list_tail(struct sk_buff_head *list,
333 struct sk_buff_head *head)
334{
335 unsigned long flags;
336
337 spin_lock_irqsave(&head->lock, flags);
338 spin_lock(&list->lock);
339
340 skb_queue_splice_tail_init(list, head);
341
342 spin_unlock(&list->lock);
343 spin_unlock_irqrestore(&head->lock, flags);
344}
345
346/**
347 * sctp_list_dequeue - remove from the head of the queue
348 * @list: list to dequeue from
349 *
350 * Remove the head of the list. The head item is
351 * returned or %NULL if the list is empty.
352 */
353
354static inline struct list_head *sctp_list_dequeue(struct list_head *list)
355{
356 struct list_head *result = NULL;
357
358 if (list->next != list) {
359 result = list->next;
360 list->next = result->next;
361 list->next->prev = list;
362 INIT_LIST_HEAD(result);
363 }
364 return result;
365}
366
367/* SCTP version of skb_set_owner_r. We need this one because
368 * of the way we have to do receive buffer accounting on bundled
369 * chunks.
370 */
371static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
372{
373 struct sctp_ulpevent *event = sctp_skb2event(skb);
374
375 skb_orphan(skb);
376 skb->sk = sk;
377 skb->destructor = sctp_sock_rfree;
378 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
379 /*
380 * This mimics the behavior of skb_set_owner_r
381 */
382 sk->sk_forward_alloc -= event->rmem_len;
383}
384
385/* Tests if the list has one and only one entry. */
386static inline int sctp_list_single_entry(struct list_head *head)
387{
388 return (head->next != head) && (head->next == head->prev);
389}
390
391/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
392static inline __s32 sctp_jitter(__u32 rto)
393{
394 static __u32 sctp_rand;
395 __s32 ret;
396
397 /* Avoid divide by zero. */
398 if (!rto)
399 rto = 1;
400
401 sctp_rand += jiffies;
402 sctp_rand ^= (sctp_rand << 12);
403 sctp_rand ^= (sctp_rand >> 20);
404
405 /* Choose random number from 0 to rto, then move to -50% ~ +50%
406 * of rto.
407 */
408 ret = sctp_rand % rto - (rto >> 1);
409 return ret;
410}
411
412/* Break down data chunks at this point. */
413static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
414{
415 struct sctp_sock *sp = sctp_sk(asoc->base.sk);
416 int frag = pmtu;
417
418 frag -= sp->pf->af->net_header_len;
419 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
420
421 if (asoc->user_frag)
422 frag = min_t(int, frag, asoc->user_frag);
423
424 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
425
426 return frag;
427}
428
429static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc)
430{
431
432 sctp_assoc_sync_pmtu(sk, asoc);
433 asoc->pmtu_pending = 0;
434}
435
436/* Walk through a list of TLV parameters. Don't trust the
437 * individual parameter lengths and instead depend on
438 * the chunk length to indicate when to stop. Make sure
439 * there is room for a param header too.
440 */
441#define sctp_walk_params(pos, chunk, member)\
442_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
443
444#define _sctp_walk_params(pos, chunk, end, member)\
445for (pos.v = chunk->member;\
446 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
447 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
448 pos.v += WORD_ROUND(ntohs(pos.p->length)))
449
450#define sctp_walk_errors(err, chunk_hdr)\
451_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
452
453#define _sctp_walk_errors(err, chunk_hdr, end)\
454for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
455 sizeof(sctp_chunkhdr_t));\
456 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
457 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
458 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
459
460#define sctp_walk_fwdtsn(pos, chunk)\
461_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
462
463#define _sctp_walk_fwdtsn(pos, chunk, end)\
464for (pos = chunk->subh.fwdtsn_hdr->skip;\
465 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
466 pos++)
467
468/* Round an int up to the next multiple of 4. */
469#define WORD_ROUND(s) (((s)+3)&~3)
470
471/* External references. */
472
473extern struct proto sctp_prot;
474extern struct proto sctpv6_prot;
475void sctp_put_port(struct sock *sk);
476
477extern struct idr sctp_assocs_id;
478extern spinlock_t sctp_assocs_id_lock;
479
480/* Static inline functions. */
481
482/* Convert from an IP version number to an Address Family symbol. */
483static inline int ipver2af(__u8 ipver)
484{
485 switch (ipver) {
486 case 4:
487 return AF_INET;
488 case 6:
489 return AF_INET6;
490 default:
491 return 0;
492 }
493}
494
495/* Convert from an address parameter type to an address family. */
496static inline int param_type2af(__be16 type)
497{
498 switch (type) {
499 case SCTP_PARAM_IPV4_ADDRESS:
500 return AF_INET;
501 case SCTP_PARAM_IPV6_ADDRESS:
502 return AF_INET6;
503 default:
504 return 0;
505 }
506}
507
508/* Warning: The following hash functions assume a power of two 'size'. */
509/* This is the hash function for the SCTP port hash table. */
510static inline int sctp_phashfn(struct net *net, __u16 lport)
511{
512 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
513}
514
515/* This is the hash function for the endpoint hash table. */
516static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
517{
518 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
519}
520
521/* This is the hash function for the association hash table. */
522static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport)
523{
524 int h = (lport << 16) + rport + net_hash_mix(net);
525 h ^= h>>8;
526 return h & (sctp_assoc_hashsize - 1);
527}
528
529/* This is the hash function for the association hash table. This is
530 * not used yet, but could be used as a better hash function when
531 * we have a vtag.
532 */
533static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
534{
535 int h = (lport << 16) + rport;
536 h ^= vtag;
537 return h & (sctp_assoc_hashsize - 1);
538}
539
540#define sctp_for_each_hentry(epb, head) \
541 hlist_for_each_entry(epb, head, node)
542
543/* Is a socket of this style? */
544#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
545static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
546{
547 return sctp_sk(sk)->type == style;
548}
549
550/* Is the association in this state? */
551#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
552static inline int __sctp_state(const struct sctp_association *asoc,
553 sctp_state_t state)
554{
555 return asoc->state == state;
556}
557
558/* Is the socket in this state? */
559#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
560static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
561{
562 return sk->sk_state == state;
563}
564
565/* Map v4-mapped v6 address back to v4 address */
566static inline void sctp_v6_map_v4(union sctp_addr *addr)
567{
568 addr->v4.sin_family = AF_INET;
569 addr->v4.sin_port = addr->v6.sin6_port;
570 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
571}
572
573/* Map v4 address to v4-mapped v6 address */
574static inline void sctp_v4_map_v6(union sctp_addr *addr)
575{
576 addr->v6.sin6_family = AF_INET6;
577 addr->v6.sin6_port = addr->v4.sin_port;
578 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
579 addr->v6.sin6_addr.s6_addr32[0] = 0;
580 addr->v6.sin6_addr.s6_addr32[1] = 0;
581 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
582}
583
584/* The cookie is always 0 since this is how it's used in the
585 * pmtu code.
586 */
587static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
588{
589 if (t->dst && !dst_check(t->dst, t->dst_cookie)) {
590 dst_release(t->dst);
591 t->dst = NULL;
592 }
593
594 return t->dst;
595}
596
597#endif /* __net_sctp_h__ */