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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05007 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * The base lksctp header.
10 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050011 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * 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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050017 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67#ifdef TEST_FRAME
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#undef CONFIG_SCTP_DBG_OBJCNT
69#undef CONFIG_SYSCTL
70#endif /* TEST_FRAME */
71
72#include <linux/types.h>
73#include <linux/slab.h>
74#include <linux/in.h>
75#include <linux/tty.h>
76#include <linux/proc_fs.h>
77#include <linux/spinlock.h>
78#include <linux/jiffies.h>
79#include <linux/idr.h>
80
81#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
82#include <net/ipv6.h>
83#include <net/ip6_route.h>
84#endif
85
86#include <asm/uaccess.h>
87#include <asm/page.h>
88#include <net/sock.h>
89#include <net/snmp.h>
90#include <net/sctp/structs.h>
91#include <net/sctp/constants.h>
92
93
94/* Set SCTP_DEBUG flag via config if not already set. */
95#ifndef SCTP_DEBUG
96#ifdef CONFIG_SCTP_DBG_MSG
97#define SCTP_DEBUG 1
98#else
99#define SCTP_DEBUG 0
100#endif /* CONFIG_SCTP_DBG */
101#endif /* SCTP_DEBUG */
102
103#ifdef CONFIG_IP_SCTP_MODULE
104#define SCTP_PROTOSW_FLAG 0
105#else /* static! */
106#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
107#endif
108
109
110/* Certain internal static functions need to be exported when
111 * compiled into the test frame.
112 */
113#ifndef SCTP_STATIC
114#define SCTP_STATIC static
115#endif
116
117/*
118 * Function declarations.
119 */
120
121/*
122 * sctp/protocol.c
123 */
124extern struct sock *sctp_get_ctl_sock(void);
Vlad Yasevich29303542007-09-16 16:02:12 -0700125extern void sctp_local_addr_free(struct rcu_head *head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
Al Virodd0fc662005-10-07 07:46:04 +0100127 sctp_scope_t, gfp_t gfp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700128 int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
130extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
131
132/*
133 * sctp/socket.c
134 */
135int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
136int sctp_inet_listen(struct socket *sock, int backlog);
137void sctp_write_space(struct sock *sk);
138unsigned int sctp_poll(struct file *file, struct socket *sock,
139 poll_table *wait);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700140void sctp_sock_rfree(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142/*
143 * sctp/primitive.c
144 */
145int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
146int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
147int sctp_primitive_ABORT(struct sctp_association *, void *arg);
148int sctp_primitive_SEND(struct sctp_association *, void *arg);
149int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
150int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
151
152/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 * sctp/input.c
154 */
155int sctp_rcv(struct sk_buff *skb);
156void sctp_v4_err(struct sk_buff *skb, u32 info);
157void sctp_hash_established(struct sctp_association *);
158void sctp_unhash_established(struct sctp_association *);
159void sctp_hash_endpoint(struct sctp_endpoint *);
160void sctp_unhash_endpoint(struct sctp_endpoint *);
161struct sock *sctp_err_lookup(int family, struct sk_buff *,
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700162 struct sctphdr *, struct sctp_association **,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 struct sctp_transport **);
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700164void sctp_err_finish(struct sock *, struct sctp_association *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
166 struct sctp_transport *t, __u32 pmtu);
167void sctp_icmp_proto_unreachable(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 struct sctp_association *asoc,
169 struct sctp_transport *t);
Sridhar Samudralac4d24442006-01-17 11:56:26 -0800170void sctp_backlog_migrate(struct sctp_association *assoc,
171 struct sock *oldsk, struct sock *newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173/*
Adrian Bunk16164362006-09-18 00:40:38 -0700174 * sctp/proc.c
175 */
176int sctp_snmp_proc_init(void);
177void sctp_snmp_proc_exit(void);
178int sctp_eps_proc_init(void);
179void sctp_eps_proc_exit(void);
180int sctp_assocs_proc_init(void);
181void sctp_assocs_proc_exit(void);
Neil Horman20c2c1f2008-05-09 15:14:50 -0700182int sctp_remaddr_proc_init(void);
183void sctp_remaddr_proc_exit(void);
Adrian Bunk16164362006-09-18 00:40:38 -0700184
185
186/*
sebastian@breakpoint.cc0a5fcb92007-07-26 23:21:32 +0200187 * Module global variables
188 */
189
190 /*
191 * sctp/protocol.c
192 */
193extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
194extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
195
196/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 * Section: Macros, externs, and inlines
198 */
199
200
201#ifdef TEST_FRAME
202#include <test_frame.h>
203#else
204
205/* spin lock wrappers. */
206#define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
207#define sctp_spin_unlock_irqrestore(lock, flags) \
208 spin_unlock_irqrestore(lock, flags)
209#define sctp_local_bh_disable() local_bh_disable()
210#define sctp_local_bh_enable() local_bh_enable()
211#define sctp_spin_lock(lock) spin_lock(lock)
212#define sctp_spin_unlock(lock) spin_unlock(lock)
213#define sctp_write_lock(lock) write_lock(lock)
214#define sctp_write_unlock(lock) write_unlock(lock)
215#define sctp_read_lock(lock) read_lock(lock)
216#define sctp_read_unlock(lock) read_unlock(lock)
217
218/* sock lock wrappers. */
219#define sctp_lock_sock(sk) lock_sock(sk)
220#define sctp_release_sock(sk) release_sock(sk)
221#define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
222#define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224/* SCTP SNMP MIB stats handlers */
225DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
226#define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field)
227#define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field)
228#define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
229#define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field)
230
231#endif /* !TEST_FRAME */
232
Sridhar Samudralaac0b0462006-08-22 00:15:33 -0700233/* sctp mib definitions */
234enum
235{
236 SCTP_MIB_NUM = 0,
237 SCTP_MIB_CURRESTAB, /* CurrEstab */
238 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
239 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
240 SCTP_MIB_ABORTEDS, /* Aborteds */
241 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
242 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
243 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
244 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
245 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
246 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
247 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
248 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
249 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
250 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
251 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
252 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
253 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
254 SCTP_MIB_T1_INIT_EXPIREDS,
255 SCTP_MIB_T1_COOKIE_EXPIREDS,
256 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
257 SCTP_MIB_T3_RTX_EXPIREDS,
258 SCTP_MIB_T4_RTO_EXPIREDS,
259 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
260 SCTP_MIB_DELAY_SACK_EXPIREDS,
261 SCTP_MIB_AUTOCLOSE_EXPIREDS,
Vlad Yasevichb6157d82007-10-24 15:59:16 -0400262 SCTP_MIB_T1_RETRANSMITS,
Sridhar Samudralaac0b0462006-08-22 00:15:33 -0700263 SCTP_MIB_T3_RETRANSMITS,
264 SCTP_MIB_PMTUD_RETRANSMITS,
265 SCTP_MIB_FAST_RETRANSMITS,
266 SCTP_MIB_IN_PKT_SOFTIRQ,
267 SCTP_MIB_IN_PKT_BACKLOG,
268 SCTP_MIB_IN_PKT_DISCARDS,
269 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
270 __SCTP_MIB_MAX
271};
272
273#define SCTP_MIB_MAX __SCTP_MIB_MAX
274struct sctp_mib {
275 unsigned long mibs[SCTP_MIB_MAX];
276} __SNMP_MIB_ALIGN__;
277
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279/* Print debugging messages. */
280#if SCTP_DEBUG
281extern int sctp_debug_flag;
282#define SCTP_DEBUG_PRINTK(whatever...) \
283 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
Frank Filz3f7a87d2005-06-20 13:14:57 -0700284#define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \
285 if (sctp_debug_flag) { \
286 if (saddr->sa.sa_family == AF_INET6) { \
287 printk(KERN_DEBUG \
Joe Perches46b86a22006-01-13 14:29:07 -0800288 lead NIP6_FMT trail, \
Frank Filz3f7a87d2005-06-20 13:14:57 -0700289 leadparm, \
290 NIP6(saddr->v6.sin6_addr), \
291 otherparms); \
292 } else { \
293 printk(KERN_DEBUG \
Joe Perches46b86a22006-01-13 14:29:07 -0800294 lead NIPQUAD_FMT trail, \
Frank Filz3f7a87d2005-06-20 13:14:57 -0700295 leadparm, \
296 NIPQUAD(saddr->v4.sin_addr.s_addr), \
297 otherparms); \
298 } \
299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
301#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
302
303#define SCTP_ASSERT(expr, str, func) \
304 if (!(expr)) { \
305 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
Harvey Harrisond5c003b2008-10-15 22:01:24 -0700306 str, (#expr), __FILE__, __func__, __LINE__); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 func; \
308 }
309
310#else /* SCTP_DEBUG */
311
312#define SCTP_DEBUG_PRINTK(whatever...)
Frank Filz3f7a87d2005-06-20 13:14:57 -0700313#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314#define SCTP_ENABLE_DEBUG
315#define SCTP_DISABLE_DEBUG
David S. Miller65fd28f2006-06-20 00:07:52 -0700316#define SCTP_ASSERT(expr, str, func)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
318#endif /* SCTP_DEBUG */
319
320
321/*
322 * Macros for keeping a global reference of object allocations.
323 */
324#ifdef CONFIG_SCTP_DBG_OBJCNT
325
326extern atomic_t sctp_dbg_objcnt_sock;
327extern atomic_t sctp_dbg_objcnt_ep;
328extern atomic_t sctp_dbg_objcnt_assoc;
329extern atomic_t sctp_dbg_objcnt_transport;
330extern atomic_t sctp_dbg_objcnt_chunk;
331extern atomic_t sctp_dbg_objcnt_bind_addr;
332extern atomic_t sctp_dbg_objcnt_bind_bucket;
333extern atomic_t sctp_dbg_objcnt_addr;
334extern atomic_t sctp_dbg_objcnt_ssnmap;
335extern atomic_t sctp_dbg_objcnt_datamsg;
Vlad Yasevich1f485642007-10-09 01:15:59 -0700336extern atomic_t sctp_dbg_objcnt_keys;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338/* Macros to atomically increment/decrement objcnt counters. */
339#define SCTP_DBG_OBJCNT_INC(name) \
340atomic_inc(&sctp_dbg_objcnt_## name)
341#define SCTP_DBG_OBJCNT_DEC(name) \
342atomic_dec(&sctp_dbg_objcnt_## name)
343#define SCTP_DBG_OBJCNT(name) \
344atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
345
346/* Macro to help create new entries in in the global array of
347 * objcnt counters.
348 */
349#define SCTP_DBG_OBJCNT_ENTRY(name) \
350{.label= #name, .counter= &sctp_dbg_objcnt_## name}
351
352void sctp_dbg_objcnt_init(void);
353void sctp_dbg_objcnt_exit(void);
354
355#else
356
357#define SCTP_DBG_OBJCNT_INC(name)
358#define SCTP_DBG_OBJCNT_DEC(name)
359
360static inline void sctp_dbg_objcnt_init(void) { return; }
361static inline void sctp_dbg_objcnt_exit(void) { return; }
362
363#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
364
365#if defined CONFIG_SYSCTL
366void sctp_sysctl_register(void);
367void sctp_sysctl_unregister(void);
368#else
369static inline void sctp_sysctl_register(void) { return; }
370static inline void sctp_sysctl_unregister(void) { return; }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371#endif
372
373/* Size of Supported Address Parameter for 'x' address types. */
374#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
375
376#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
377
Vlad Yasevich270637a2008-03-20 15:17:14 -0700378void sctp_v6_pf_init(void);
379void sctp_v6_pf_exit(void);
380int sctp_v6_protosw_init(void);
381void sctp_v6_protosw_exit(void);
Sridhar Samudrala827bf122007-05-04 13:36:30 -0700382int sctp_v6_add_protocol(void);
383void sctp_v6_del_protocol(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385#else /* #ifdef defined(CONFIG_IPV6) */
386
David S. Miller12338232008-03-21 15:40:47 -0700387static inline void sctp_v6_pf_init(void) { return; }
Vlad Yasevich270637a2008-03-20 15:17:14 -0700388static inline void sctp_v6_pf_exit(void) { return; }
389static inline int sctp_v6_protosw_init(void) { return 0; }
390static inline void sctp_v6_protosw_exit(void) { return; }
Sridhar Samudrala827bf122007-05-04 13:36:30 -0700391static inline int sctp_v6_add_protocol(void) { return 0; }
392static inline void sctp_v6_del_protocol(void) { return; }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394#endif /* #if defined(CONFIG_IPV6) */
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
397/* Map an association to an assoc_id. */
398static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
399{
400 return (asoc?asoc->assoc_id:0);
401}
402
403/* Look up the association by its id. */
404struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
405
406
407/* A macro to walk a list of skbs. */
408#define sctp_skb_for_each(pos, head, tmp) \
David S. Miller3d092742008-09-22 22:14:36 -0700409 skb_queue_walk_safe(head, pos, tmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411/* A helper to append an entire skb list (list) to another (head). */
412static inline void sctp_skb_list_tail(struct sk_buff_head *list,
413 struct sk_buff_head *head)
414{
415 unsigned long flags;
416
417 sctp_spin_lock_irqsave(&head->lock, flags);
418 sctp_spin_lock(&list->lock);
419
David S. Miller3d092742008-09-22 22:14:36 -0700420 skb_queue_splice_tail_init(list, head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422 sctp_spin_unlock(&list->lock);
423 sctp_spin_unlock_irqrestore(&head->lock, flags);
424}
425
426/**
427 * sctp_list_dequeue - remove from the head of the queue
428 * @list: list to dequeue from
429 *
430 * Remove the head of the list. The head item is
431 * returned or %NULL if the list is empty.
432 */
433
434static inline struct list_head *sctp_list_dequeue(struct list_head *list)
435{
436 struct list_head *result = NULL;
437
438 if (list->next != list) {
439 result = list->next;
440 list->next = result->next;
441 list->next->prev = list;
442 INIT_LIST_HEAD(result);
443 }
444 return result;
445}
446
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700447/* SCTP version of skb_set_owner_r. We need this one because
448 * of the way we have to do receive buffer accounting on bundled
449 * chunks.
450 */
451static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
452{
453 struct sctp_ulpevent *event = sctp_skb2event(skb);
454
455 skb->sk = sk;
456 skb->destructor = sctp_sock_rfree;
457 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
Neil Horman4d93df02007-08-15 16:07:44 -0700458 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -0800459 * This mimics the behavior of skb_set_owner_r
Neil Horman4d93df02007-08-15 16:07:44 -0700460 */
461 sk->sk_forward_alloc -= event->rmem_len;
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700462}
463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464/* Tests if the list has one and only one entry. */
465static inline int sctp_list_single_entry(struct list_head *head)
466{
467 return ((head->next != head) && (head->next == head->prev));
468}
469
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
471static inline __s32 sctp_jitter(__u32 rto)
472{
473 static __u32 sctp_rand;
474 __s32 ret;
475
476 /* Avoid divide by zero. */
477 if (!rto)
478 rto = 1;
479
480 sctp_rand += jiffies;
481 sctp_rand ^= (sctp_rand << 12);
482 sctp_rand ^= (sctp_rand >> 20);
483
484 /* Choose random number from 0 to rto, then move to -50% ~ +50%
485 * of rto.
486 */
487 ret = sctp_rand % rto - (rto >> 1);
488 return ret;
489}
490
491/* Break down data chunks at this point. */
492static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu)
493{
494 int frag = pmtu;
495
496 frag -= sp->pf->af->net_header_len;
497 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
498
499 if (sp->user_frag)
500 frag = min_t(int, frag, sp->user_frag);
501
502 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
503
504 return frag;
505}
506
Vlad Yasevich8a479492007-06-07 14:21:05 -0400507static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc)
508{
509
510 sctp_assoc_sync_pmtu(asoc);
511 asoc->pmtu_pending = 0;
512}
513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514/* Walk through a list of TLV parameters. Don't trust the
515 * individual parameter lengths and instead depend on
516 * the chunk length to indicate when to stop. Make sure
517 * there is room for a param header too.
518 */
519#define sctp_walk_params(pos, chunk, member)\
Vladislav Yasevichdd2d1c62006-05-19 11:52:20 -0700520_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522#define _sctp_walk_params(pos, chunk, end, member)\
523for (pos.v = chunk->member;\
524 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\
Vladislav Yasevichdd2d1c62006-05-19 11:52:20 -0700525 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
527 pos.v += WORD_ROUND(ntohs(pos.p->length)))
528
529#define sctp_walk_errors(err, chunk_hdr)\
530_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
531
532#define _sctp_walk_errors(err, chunk_hdr, end)\
533for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
534 sizeof(sctp_chunkhdr_t));\
535 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\
Vladislav Yasevichdd2d1c62006-05-19 11:52:20 -0700536 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
538 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
539
540#define sctp_walk_fwdtsn(pos, chunk)\
541_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
542
543#define _sctp_walk_fwdtsn(pos, chunk, end)\
544for (pos = chunk->subh.fwdtsn_hdr->skip;\
545 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
546 pos++)
547
548/* Round an int up to the next multiple of 4. */
549#define WORD_ROUND(s) (((s)+3)&~3)
550
551/* Make a new instance of type. */
552#define t_new(type, flags) (type *)kmalloc(sizeof(type), flags)
553
554/* Compare two timevals. */
555#define tv_lt(s, t) \
556 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
557
558/* Add tv1 to tv2. */
559#define TIMEVAL_ADD(tv1, tv2) \
560({ \
561 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
562 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
563\
564 if (usecs >= 1000000) { \
565 usecs -= 1000000; \
566 secs++; \
567 } \
568 (tv2).tv_sec = secs; \
569 (tv2).tv_usec = usecs; \
570})
571
572/* External references. */
573
574extern struct proto sctp_prot;
575extern struct proto sctpv6_prot;
576extern struct proc_dir_entry *proc_net_sctp;
577void sctp_put_port(struct sock *sk);
578
579extern struct idr sctp_assocs_id;
580extern spinlock_t sctp_assocs_id_lock;
581
582/* Static inline functions. */
583
584/* Convert from an IP version number to an Address Family symbol. */
585static inline int ipver2af(__u8 ipver)
586{
587 switch (ipver) {
588 case 4:
589 return AF_INET;
590 case 6:
591 return AF_INET6;
592 default:
593 return 0;
594 };
595}
596
597/* Convert from an address parameter type to an address family. */
Al Virodbc16db2006-11-20 17:01:42 -0800598static inline int param_type2af(__be16 type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599{
600 switch (type) {
601 case SCTP_PARAM_IPV4_ADDRESS:
602 return AF_INET;
603 case SCTP_PARAM_IPV6_ADDRESS:
604 return AF_INET6;
605 default:
606 return 0;
607 };
608}
609
610/* Perform some sanity checks. */
611static inline int sctp_sanity_check(void)
612{
613 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
614 sizeof(((struct sk_buff *)0)->cb),
615 "SCTP: ulpevent does not fit in skb!\n", return 0);
616
617 return 1;
618}
619
620/* Warning: The following hash functions assume a power of two 'size'. */
621/* This is the hash function for the SCTP port hash table. */
622static inline int sctp_phashfn(__u16 lport)
623{
624 return (lport & (sctp_port_hashsize - 1));
625}
626
627/* This is the hash function for the endpoint hash table. */
628static inline int sctp_ep_hashfn(__u16 lport)
629{
630 return (lport & (sctp_ep_hashsize - 1));
631}
632
633/* This is the hash function for the association hash table. */
634static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
635{
636 int h = (lport << 16) + rport;
637 h ^= h>>8;
638 return (h & (sctp_assoc_hashsize - 1));
639}
640
641/* This is the hash function for the association hash table. This is
642 * not used yet, but could be used as a better hash function when
643 * we have a vtag.
644 */
645static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
646{
647 int h = (lport << 16) + rport;
648 h ^= vtag;
649 return (h & (sctp_assoc_hashsize-1));
650}
651
Vlad Yasevichd970dbf2007-11-09 11:43:40 -0500652#define sctp_for_each_hentry(epb, node, head) \
653 hlist_for_each_entry(epb, node, head, node)
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655/* Is a socket of this style? */
656#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
657static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
658{
659 return sctp_sk(sk)->type == style;
660}
661
662/* Is the association in this state? */
663#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
664static inline int __sctp_state(const struct sctp_association *asoc,
665 sctp_state_t state)
666{
667 return asoc->state == state;
668}
669
670/* Is the socket in this state? */
671#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
672static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
673{
674 return sk->sk_state == state;
675}
676
677/* Map v4-mapped v6 address back to v4 address */
678static inline void sctp_v6_map_v4(union sctp_addr *addr)
679{
680 addr->v4.sin_family = AF_INET;
681 addr->v4.sin_port = addr->v6.sin6_port;
682 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
683}
684
685/* Map v4 address to v4-mapped v6 address */
686static inline void sctp_v4_map_v6(union sctp_addr *addr)
687{
688 addr->v6.sin6_family = AF_INET6;
689 addr->v6.sin6_port = addr->v4.sin_port;
690 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
691 addr->v6.sin6_addr.s6_addr32[0] = 0;
692 addr->v6.sin6_addr.s6_addr32[1] = 0;
693 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
694}
695
696#endif /* __net_sctp_h__ */