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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#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);
Vlad Yasevich29303542007-09-16 16:02:12 -0700118extern void sctp_local_addr_free(struct rcu_head *head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
Al Virodd0fc662005-10-07 07:46:04 +0100120 sctp_scope_t, gfp_t gfp,
Alexey Dobriyan3182cd842005-07-11 20:57:47 -0700121 int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
123extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
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);
131unsigned int sctp_poll(struct file *file, struct socket *sock,
132 poll_table *wait);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700133void sctp_sock_rfree(struct sk_buff *skb);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000134void sctp_copy_sock(struct sock *newsk, struct sock *sk,
135 struct sctp_association *asoc);
Eric Dumazet17483762008-11-25 21:16:35 -0800136extern struct percpu_counter sctp_sockets_allocated;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138/*
139 * sctp/primitive.c
140 */
141int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
142int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
143int sctp_primitive_ABORT(struct sctp_association *, void *arg);
144int sctp_primitive_SEND(struct sctp_association *, void *arg);
145int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
146int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
147
148/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 * sctp/input.c
150 */
151int sctp_rcv(struct sk_buff *skb);
152void sctp_v4_err(struct sk_buff *skb, u32 info);
153void sctp_hash_established(struct sctp_association *);
154void sctp_unhash_established(struct sctp_association *);
155void sctp_hash_endpoint(struct sctp_endpoint *);
156void sctp_unhash_endpoint(struct sctp_endpoint *);
157struct sock *sctp_err_lookup(int family, struct sk_buff *,
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700158 struct sctphdr *, struct sctp_association **,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 struct sctp_transport **);
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700160void sctp_err_finish(struct sock *, struct sctp_association *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
162 struct sctp_transport *t, __u32 pmtu);
163void sctp_icmp_proto_unreachable(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 struct sctp_association *asoc,
165 struct sctp_transport *t);
Sridhar Samudralac4d24442006-01-17 11:56:26 -0800166void sctp_backlog_migrate(struct sctp_association *assoc,
167 struct sock *oldsk, struct sock *newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169/*
Adrian Bunk16164362006-09-18 00:40:38 -0700170 * sctp/proc.c
171 */
172int sctp_snmp_proc_init(void);
173void sctp_snmp_proc_exit(void);
174int sctp_eps_proc_init(void);
175void sctp_eps_proc_exit(void);
176int sctp_assocs_proc_init(void);
177void sctp_assocs_proc_exit(void);
Neil Horman20c2c1f2008-05-09 15:14:50 -0700178int sctp_remaddr_proc_init(void);
179void sctp_remaddr_proc_exit(void);
Adrian Bunk16164362006-09-18 00:40:38 -0700180
181
182/*
sebastian@breakpoint.cc0a5fcb92007-07-26 23:21:32 +0200183 * Module global variables
184 */
185
186 /*
187 * sctp/protocol.c
188 */
189extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
190extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
191
192/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 * 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220/* SCTP SNMP MIB stats handlers */
221DECLARE_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
Sridhar Samudralaac0b0462006-08-22 00:15:33 -0700229/* sctp mib definitions */
230enum
231{
232 SCTP_MIB_NUM = 0,
233 SCTP_MIB_CURRESTAB, /* CurrEstab */
234 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
235 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
236 SCTP_MIB_ABORTEDS, /* Aborteds */
237 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
238 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
239 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
240 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
241 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
242 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
243 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
244 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
245 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
246 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
247 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
248 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
249 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
250 SCTP_MIB_T1_INIT_EXPIREDS,
251 SCTP_MIB_T1_COOKIE_EXPIREDS,
252 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
253 SCTP_MIB_T3_RTX_EXPIREDS,
254 SCTP_MIB_T4_RTO_EXPIREDS,
255 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
256 SCTP_MIB_DELAY_SACK_EXPIREDS,
257 SCTP_MIB_AUTOCLOSE_EXPIREDS,
Vlad Yasevichb6157d82007-10-24 15:59:16 -0400258 SCTP_MIB_T1_RETRANSMITS,
Sridhar Samudralaac0b0462006-08-22 00:15:33 -0700259 SCTP_MIB_T3_RETRANSMITS,
260 SCTP_MIB_PMTUD_RETRANSMITS,
261 SCTP_MIB_FAST_RETRANSMITS,
262 SCTP_MIB_IN_PKT_SOFTIRQ,
263 SCTP_MIB_IN_PKT_BACKLOG,
264 SCTP_MIB_IN_PKT_DISCARDS,
265 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
266 __SCTP_MIB_MAX
267};
268
269#define SCTP_MIB_MAX __SCTP_MIB_MAX
270struct sctp_mib {
271 unsigned long mibs[SCTP_MIB_MAX];
272} __SNMP_MIB_ALIGN__;
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
275/* Print debugging messages. */
276#if SCTP_DEBUG
277extern int sctp_debug_flag;
278#define SCTP_DEBUG_PRINTK(whatever...) \
279 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
Frank Filz3f7a87d2005-06-20 13:14:57 -0700280#define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \
281 if (sctp_debug_flag) { \
282 if (saddr->sa.sa_family == AF_INET6) { \
283 printk(KERN_DEBUG \
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700284 lead "%pI6" trail, \
Frank Filz3f7a87d2005-06-20 13:14:57 -0700285 leadparm, \
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700286 &saddr->v6.sin6_addr, \
Frank Filz3f7a87d2005-06-20 13:14:57 -0700287 otherparms); \
288 } else { \
289 printk(KERN_DEBUG \
Harvey Harrison3685f252008-10-31 00:56:49 -0700290 lead "%pI4" trail, \
Frank Filz3f7a87d2005-06-20 13:14:57 -0700291 leadparm, \
Harvey Harrison3685f252008-10-31 00:56:49 -0700292 &saddr->v4.sin_addr.s_addr, \
Frank Filz3f7a87d2005-06-20 13:14:57 -0700293 otherparms); \
294 } \
295 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
297#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
298
299#define SCTP_ASSERT(expr, str, func) \
300 if (!(expr)) { \
301 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
Harvey Harrisond5c003b2008-10-15 22:01:24 -0700302 str, (#expr), __FILE__, __func__, __LINE__); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 func; \
304 }
305
306#else /* SCTP_DEBUG */
307
308#define SCTP_DEBUG_PRINTK(whatever...)
Frank Filz3f7a87d2005-06-20 13:14:57 -0700309#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310#define SCTP_ENABLE_DEBUG
311#define SCTP_DISABLE_DEBUG
David S. Miller65fd28f2006-06-20 00:07:52 -0700312#define SCTP_ASSERT(expr, str, func)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314#endif /* SCTP_DEBUG */
315
316
317/*
318 * Macros for keeping a global reference of object allocations.
319 */
320#ifdef CONFIG_SCTP_DBG_OBJCNT
321
322extern atomic_t sctp_dbg_objcnt_sock;
323extern atomic_t sctp_dbg_objcnt_ep;
324extern atomic_t sctp_dbg_objcnt_assoc;
325extern atomic_t sctp_dbg_objcnt_transport;
326extern atomic_t sctp_dbg_objcnt_chunk;
327extern atomic_t sctp_dbg_objcnt_bind_addr;
328extern atomic_t sctp_dbg_objcnt_bind_bucket;
329extern atomic_t sctp_dbg_objcnt_addr;
330extern atomic_t sctp_dbg_objcnt_ssnmap;
331extern atomic_t sctp_dbg_objcnt_datamsg;
Vlad Yasevich1f485642007-10-09 01:15:59 -0700332extern atomic_t sctp_dbg_objcnt_keys;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334/* Macros to atomically increment/decrement objcnt counters. */
335#define SCTP_DBG_OBJCNT_INC(name) \
336atomic_inc(&sctp_dbg_objcnt_## name)
337#define SCTP_DBG_OBJCNT_DEC(name) \
338atomic_dec(&sctp_dbg_objcnt_## name)
339#define SCTP_DBG_OBJCNT(name) \
340atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
341
342/* Macro to help create new entries in in the global array of
343 * objcnt counters.
344 */
345#define SCTP_DBG_OBJCNT_ENTRY(name) \
346{.label= #name, .counter= &sctp_dbg_objcnt_## name}
347
348void sctp_dbg_objcnt_init(void);
349void sctp_dbg_objcnt_exit(void);
350
351#else
352
353#define SCTP_DBG_OBJCNT_INC(name)
354#define SCTP_DBG_OBJCNT_DEC(name)
355
356static inline void sctp_dbg_objcnt_init(void) { return; }
357static inline void sctp_dbg_objcnt_exit(void) { return; }
358
359#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
360
361#if defined CONFIG_SYSCTL
362void sctp_sysctl_register(void);
363void sctp_sysctl_unregister(void);
364#else
365static inline void sctp_sysctl_register(void) { return; }
366static inline void sctp_sysctl_unregister(void) { return; }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367#endif
368
369/* Size of Supported Address Parameter for 'x' address types. */
370#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
371
372#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
373
Vlad Yasevich270637a2008-03-20 15:17:14 -0700374void sctp_v6_pf_init(void);
375void sctp_v6_pf_exit(void);
376int sctp_v6_protosw_init(void);
377void sctp_v6_protosw_exit(void);
Sridhar Samudrala827bf122007-05-04 13:36:30 -0700378int sctp_v6_add_protocol(void);
379void sctp_v6_del_protocol(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381#else /* #ifdef defined(CONFIG_IPV6) */
382
David S. Miller12338232008-03-21 15:40:47 -0700383static inline void sctp_v6_pf_init(void) { return; }
Vlad Yasevich270637a2008-03-20 15:17:14 -0700384static inline void sctp_v6_pf_exit(void) { return; }
385static inline int sctp_v6_protosw_init(void) { return 0; }
386static inline void sctp_v6_protosw_exit(void) { return; }
Sridhar Samudrala827bf122007-05-04 13:36:30 -0700387static inline int sctp_v6_add_protocol(void) { return 0; }
388static inline void sctp_v6_del_protocol(void) { return; }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390#endif /* #if defined(CONFIG_IPV6) */
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393/* Map an association to an assoc_id. */
394static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
395{
396 return (asoc?asoc->assoc_id:0);
397}
398
399/* Look up the association by its id. */
400struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
401
402
403/* A macro to walk a list of skbs. */
404#define sctp_skb_for_each(pos, head, tmp) \
David S. Miller3d092742008-09-22 22:14:36 -0700405 skb_queue_walk_safe(head, pos, tmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407/* A helper to append an entire skb list (list) to another (head). */
408static inline void sctp_skb_list_tail(struct sk_buff_head *list,
409 struct sk_buff_head *head)
410{
411 unsigned long flags;
412
413 sctp_spin_lock_irqsave(&head->lock, flags);
414 sctp_spin_lock(&list->lock);
415
David S. Miller3d092742008-09-22 22:14:36 -0700416 skb_queue_splice_tail_init(list, head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 sctp_spin_unlock(&list->lock);
419 sctp_spin_unlock_irqrestore(&head->lock, flags);
420}
421
422/**
423 * sctp_list_dequeue - remove from the head of the queue
424 * @list: list to dequeue from
425 *
426 * Remove the head of the list. The head item is
427 * returned or %NULL if the list is empty.
428 */
429
430static inline struct list_head *sctp_list_dequeue(struct list_head *list)
431{
432 struct list_head *result = NULL;
433
434 if (list->next != list) {
435 result = list->next;
436 list->next = result->next;
437 list->next->prev = list;
438 INIT_LIST_HEAD(result);
439 }
440 return result;
441}
442
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700443/* SCTP version of skb_set_owner_r. We need this one because
444 * of the way we have to do receive buffer accounting on bundled
445 * chunks.
446 */
447static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
448{
449 struct sctp_ulpevent *event = sctp_skb2event(skb);
450
451 skb->sk = sk;
452 skb->destructor = sctp_sock_rfree;
453 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
Neil Horman4d93df02007-08-15 16:07:44 -0700454 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -0800455 * This mimics the behavior of skb_set_owner_r
Neil Horman4d93df02007-08-15 16:07:44 -0700456 */
457 sk->sk_forward_alloc -= event->rmem_len;
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700458}
459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460/* Tests if the list has one and only one entry. */
461static inline int sctp_list_single_entry(struct list_head *head)
462{
463 return ((head->next != head) && (head->next == head->prev));
464}
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
467static inline __s32 sctp_jitter(__u32 rto)
468{
469 static __u32 sctp_rand;
470 __s32 ret;
471
472 /* Avoid divide by zero. */
473 if (!rto)
474 rto = 1;
475
476 sctp_rand += jiffies;
477 sctp_rand ^= (sctp_rand << 12);
478 sctp_rand ^= (sctp_rand >> 20);
479
480 /* Choose random number from 0 to rto, then move to -50% ~ +50%
481 * of rto.
482 */
483 ret = sctp_rand % rto - (rto >> 1);
484 return ret;
485}
486
487/* Break down data chunks at this point. */
488static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu)
489{
490 int frag = pmtu;
491
492 frag -= sp->pf->af->net_header_len;
493 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
494
495 if (sp->user_frag)
496 frag = min_t(int, frag, sp->user_frag);
497
498 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
499
500 return frag;
501}
502
Vlad Yasevich8a479492007-06-07 14:21:05 -0400503static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc)
504{
505
506 sctp_assoc_sync_pmtu(asoc);
507 asoc->pmtu_pending = 0;
508}
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510/* Walk through a list of TLV parameters. Don't trust the
511 * individual parameter lengths and instead depend on
512 * the chunk length to indicate when to stop. Make sure
513 * there is room for a param header too.
514 */
515#define sctp_walk_params(pos, chunk, member)\
Vladislav Yasevichdd2d1c62006-05-19 11:52:20 -0700516_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518#define _sctp_walk_params(pos, chunk, end, member)\
519for (pos.v = chunk->member;\
520 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\
Vladislav Yasevichdd2d1c62006-05-19 11:52:20 -0700521 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
523 pos.v += WORD_ROUND(ntohs(pos.p->length)))
524
525#define sctp_walk_errors(err, chunk_hdr)\
526_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
527
528#define _sctp_walk_errors(err, chunk_hdr, end)\
529for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
530 sizeof(sctp_chunkhdr_t));\
531 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\
Vladislav Yasevichdd2d1c62006-05-19 11:52:20 -0700532 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
534 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
535
536#define sctp_walk_fwdtsn(pos, chunk)\
537_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
538
539#define _sctp_walk_fwdtsn(pos, chunk, end)\
540for (pos = chunk->subh.fwdtsn_hdr->skip;\
541 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
542 pos++)
543
544/* Round an int up to the next multiple of 4. */
545#define WORD_ROUND(s) (((s)+3)&~3)
546
547/* Make a new instance of type. */
548#define t_new(type, flags) (type *)kmalloc(sizeof(type), flags)
549
550/* Compare two timevals. */
551#define tv_lt(s, t) \
552 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
553
554/* Add tv1 to tv2. */
555#define TIMEVAL_ADD(tv1, tv2) \
556({ \
557 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
558 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
559\
560 if (usecs >= 1000000) { \
561 usecs -= 1000000; \
562 secs++; \
563 } \
564 (tv2).tv_sec = secs; \
565 (tv2).tv_usec = usecs; \
566})
567
568/* External references. */
569
570extern struct proto sctp_prot;
571extern struct proto sctpv6_prot;
572extern struct proc_dir_entry *proc_net_sctp;
573void sctp_put_port(struct sock *sk);
574
575extern struct idr sctp_assocs_id;
576extern spinlock_t sctp_assocs_id_lock;
577
578/* Static inline functions. */
579
580/* Convert from an IP version number to an Address Family symbol. */
581static inline int ipver2af(__u8 ipver)
582{
583 switch (ipver) {
584 case 4:
585 return AF_INET;
586 case 6:
587 return AF_INET6;
588 default:
589 return 0;
590 };
591}
592
593/* Convert from an address parameter type to an address family. */
Al Virodbc16db2006-11-20 17:01:42 -0800594static inline int param_type2af(__be16 type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
596 switch (type) {
597 case SCTP_PARAM_IPV4_ADDRESS:
598 return AF_INET;
599 case SCTP_PARAM_IPV6_ADDRESS:
600 return AF_INET6;
601 default:
602 return 0;
603 };
604}
605
606/* Perform some sanity checks. */
607static inline int sctp_sanity_check(void)
608{
609 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
610 sizeof(((struct sk_buff *)0)->cb),
611 "SCTP: ulpevent does not fit in skb!\n", return 0);
612
613 return 1;
614}
615
616/* Warning: The following hash functions assume a power of two 'size'. */
617/* This is the hash function for the SCTP port hash table. */
618static inline int sctp_phashfn(__u16 lport)
619{
620 return (lport & (sctp_port_hashsize - 1));
621}
622
623/* This is the hash function for the endpoint hash table. */
624static inline int sctp_ep_hashfn(__u16 lport)
625{
626 return (lport & (sctp_ep_hashsize - 1));
627}
628
629/* This is the hash function for the association hash table. */
630static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
631{
632 int h = (lport << 16) + rport;
633 h ^= h>>8;
634 return (h & (sctp_assoc_hashsize - 1));
635}
636
637/* This is the hash function for the association hash table. This is
638 * not used yet, but could be used as a better hash function when
639 * we have a vtag.
640 */
641static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
642{
643 int h = (lport << 16) + rport;
644 h ^= vtag;
645 return (h & (sctp_assoc_hashsize-1));
646}
647
Vlad Yasevichd970dbf2007-11-09 11:43:40 -0500648#define sctp_for_each_hentry(epb, node, head) \
649 hlist_for_each_entry(epb, node, head, node)
650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651/* Is a socket of this style? */
652#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
653static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
654{
655 return sctp_sk(sk)->type == style;
656}
657
658/* Is the association in this state? */
659#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
660static inline int __sctp_state(const struct sctp_association *asoc,
661 sctp_state_t state)
662{
663 return asoc->state == state;
664}
665
666/* Is the socket in this state? */
667#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
668static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
669{
670 return sk->sk_state == state;
671}
672
673/* Map v4-mapped v6 address back to v4 address */
674static inline void sctp_v6_map_v4(union sctp_addr *addr)
675{
676 addr->v4.sin_family = AF_INET;
677 addr->v4.sin_port = addr->v6.sin6_port;
678 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
679}
680
681/* Map v4 address to v4-mapped v6 address */
682static inline void sctp_v4_map_v6(union sctp_addr *addr)
683{
684 addr->v6.sin6_family = AF_INET6;
685 addr->v6.sin6_port = addr->v4.sin_port;
686 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
687 addr->v6.sin6_addr.s6_addr32[0] = 0;
688 addr->v6.sin6_addr.s6_addr32[1] = 0;
689 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
690}
691
692#endif /* __net_sctp_h__ */