projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'v3.10.108' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / net / sctp / sctp.h
CommitLineData
60c778b2 1/* SCTP kernel implementation
1da177e4
LT		 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 *
60c778b2 7 * This file is part of the SCTP kernel implementation
1da177e4
LT		 8 *
9 * The base lksctp header.
10 *
60c778b2 11 * This SCTP implementation is free software;
1da177e4
LT		 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 *
60c778b2 17 * This SCTP implementation is distributed in the hope that it
1da177e4
LT		 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
1da177e4
LT		 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
dfd56b8b 74#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 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 */
4db67e80 117extern int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *,
dd0fc66f 118 sctp_scope_t, gfp_t gfp,
3182cd84 119 int flags);
1da177e4
LT		 120extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
121extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
4db67e80 122extern void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int);
1da177e4
LT		 123
124/*
125 * sctp/socket.c
126 */
127int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
128int sctp_inet_listen(struct socket *sock, int backlog);
129void sctp_write_space(struct sock *sk);
561b1733 130void sctp_data_ready(struct sock *sk, int len);
1da177e4
LT		 131unsigned int sctp_poll(struct file *file, struct socket *sock,
132 poll_table *wait);
331c4ee7 133void sctp_sock_rfree(struct sk_buff *skb);
914e1c8b
VY		 134void sctp_copy_sock(struct sock *newsk, struct sock *sk,
135 struct sctp_association *asoc);
1748376b 136extern struct percpu_counter sctp_sockets_allocated;
9f7d653b 137extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
1da177e4
LT		 138
139/*
140 * sctp/primitive.c
141 */
55e26eb9
EB		 142int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg);
143int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg);
144int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg);
145int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg);
146int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg);
147int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg);
1da177e4 148
1da177e4
LT		 149/*
150 * sctp/input.c
151 */
152int sctp_rcv(struct sk_buff *skb);
153void sctp_v4_err(struct sk_buff *skb, u32 info);
154void sctp_hash_established(struct sctp_association *);
155void sctp_unhash_established(struct sctp_association *);
156void sctp_hash_endpoint(struct sctp_endpoint *);
157void sctp_unhash_endpoint(struct sctp_endpoint *);
4110cc25 158struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
d1ad1ff2 159 struct sctphdr *, struct sctp_association **,
1da177e4 160 struct sctp_transport **);
d1ad1ff2 161void sctp_err_finish(struct sock *, struct sctp_association *);
1da177e4
LT		 162void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
163 struct sctp_transport *t, __u32 pmtu);
ec18d9a2
DM		 164void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
165 struct sk_buff *);
1da177e4 166void sctp_icmp_proto_unreachable(struct sock *sk,
1da177e4
LT		 167 struct sctp_association *asoc,
168 struct sctp_transport *t);
c4d2444e
SS		 169void sctp_backlog_migrate(struct sctp_association *assoc,
170 struct sock *oldsk, struct sock *newsk);
1da177e4 171
16164366
AB		 172/*
173 * sctp/proc.c
174 */
13d782f6
EB		 175int sctp_snmp_proc_init(struct net *net);
176void sctp_snmp_proc_exit(struct net *net);
177int sctp_eps_proc_init(struct net *net);
178void sctp_eps_proc_exit(struct net *net);
179int sctp_assocs_proc_init(struct net *net);
180void sctp_assocs_proc_exit(struct net *net);
181int sctp_remaddr_proc_init(struct net *net);
182void sctp_remaddr_proc_exit(struct net *net);
16164366
AB		 183
184
0a5fcb9c 185/*
186 * Module global variables
187 */
188
189 /*
190 * sctp/protocol.c
191 */
192extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
193extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
194
1da177e4
LT		 195/*
196 * Section: Macros, externs, and inlines
197 */
198
199
200#ifdef TEST_FRAME
201#include <test_frame.h>
202#else
203
204/* spin lock wrappers. */
205#define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
206#define sctp_spin_unlock_irqrestore(lock, flags) \
207 spin_unlock_irqrestore(lock, flags)
208#define sctp_local_bh_disable() local_bh_disable()
209#define sctp_local_bh_enable() local_bh_enable()
210#define sctp_spin_lock(lock) spin_lock(lock)
211#define sctp_spin_unlock(lock) spin_unlock(lock)
212#define sctp_write_lock(lock) write_lock(lock)
213#define sctp_write_unlock(lock) write_unlock(lock)
214#define sctp_read_lock(lock) read_lock(lock)
215#define sctp_read_unlock(lock) read_unlock(lock)
216
217/* sock lock wrappers. */
218#define sctp_lock_sock(sk) lock_sock(sk)
219#define sctp_release_sock(sk) release_sock(sk)
220#define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
221#define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
1da177e4
LT		 222
223/* SCTP SNMP MIB stats handlers */
b01a2407
EB		 224#define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
225#define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field)
226#define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field)
227#define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
1da177e4
LT		 228
229#endif /* !TEST_FRAME */
230
ac0b0462 231/* sctp mib definitions */
fd2c3ef7 232enum {
ac0b0462
SS		 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,
b6157d8e 259 SCTP_MIB_T1_RETRANSMITS,
ac0b0462
SS		 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];
ec733b15 273};
ac0b0462 274
196d6759
MB		 275/* helper function to track stats about max rto and related transport */
276static inline void sctp_max_rto(struct sctp_association *asoc,
277 struct sctp_transport *trans)
278{
279 if (asoc->stats.max_obs_rto < (__u64)trans->rto) {
280 asoc->stats.max_obs_rto = trans->rto;
281 memset(&asoc->stats.obs_rto_ipaddr, 0,
282 sizeof(struct sockaddr_storage));
283 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr,
284 trans->af_specific->sockaddr_len);
285 }
286}
1da177e4
LT		 287
288/* Print debugging messages. */
289#if SCTP_DEBUG
290extern int sctp_debug_flag;
145ce502
JP		 291#define SCTP_DEBUG_PRINTK(fmt, args...) \
292do { \
293 if (sctp_debug_flag) \
294 printk(KERN_DEBUG pr_fmt(fmt), ##args); \
295} while (0)
296#define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \
297do { \
298 if (sctp_debug_flag) \
299 pr_cont(fmt, ##args); \
300} while (0)
301#define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \
3ced2ddd 302 args_lead, addr, args_trail...) \
145ce502 303do { \
3ced2ddd 304 const union sctp_addr *_addr = (addr); \
145ce502 305 if (sctp_debug_flag) { \
3ced2ddd 306 if (_addr->sa.sa_family == AF_INET6) { \
145ce502
JP		 307 printk(KERN_DEBUG \
308 pr_fmt(fmt_lead "%pI6" fmt_trail), \
309 args_lead, \
3ced2ddd 310 &_addr->v6.sin6_addr, \
145ce502
JP		 311 args_trail); \
312 } else { \
313 printk(KERN_DEBUG \
314 pr_fmt(fmt_lead "%pI4" fmt_trail), \
315 args_lead, \
3ced2ddd 316 &_addr->v4.sin_addr.s_addr, \
145ce502
JP		 317 args_trail); \
318 } \
319 } \
320} while (0)
1da177e4
LT		 321#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
322#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
323
324#define SCTP_ASSERT(expr, str, func) \
325 if (!(expr)) { \
326 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
d5c003b4 327 str, (#expr), __FILE__, __func__, __LINE__); \
1da177e4
LT		 328 func; \
329 }
330
331#else /* SCTP_DEBUG */
332
333#define SCTP_DEBUG_PRINTK(whatever...)
145ce502 334#define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
3f7a87d2 335#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
1da177e4
LT		 336#define SCTP_ENABLE_DEBUG
337#define SCTP_DISABLE_DEBUG
65fd28f7 338#define SCTP_ASSERT(expr, str, func)
1da177e4
LT		 339
340#endif /* SCTP_DEBUG */
341
342
343/*
344 * Macros for keeping a global reference of object allocations.
345 */
346#ifdef CONFIG_SCTP_DBG_OBJCNT
347
348extern atomic_t sctp_dbg_objcnt_sock;
349extern atomic_t sctp_dbg_objcnt_ep;
350extern atomic_t sctp_dbg_objcnt_assoc;
351extern atomic_t sctp_dbg_objcnt_transport;
352extern atomic_t sctp_dbg_objcnt_chunk;
353extern atomic_t sctp_dbg_objcnt_bind_addr;
354extern atomic_t sctp_dbg_objcnt_bind_bucket;
355extern atomic_t sctp_dbg_objcnt_addr;
356extern atomic_t sctp_dbg_objcnt_ssnmap;
357extern atomic_t sctp_dbg_objcnt_datamsg;
1f485649 358extern atomic_t sctp_dbg_objcnt_keys;
1da177e4
LT		 359
360/* Macros to atomically increment/decrement objcnt counters. */
361#define SCTP_DBG_OBJCNT_INC(name) \
362atomic_inc(&sctp_dbg_objcnt_## name)
363#define SCTP_DBG_OBJCNT_DEC(name) \
364atomic_dec(&sctp_dbg_objcnt_## name)
365#define SCTP_DBG_OBJCNT(name) \
366atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
367
368/* Macro to help create new entries in in the global array of
369 * objcnt counters.
370 */
371#define SCTP_DBG_OBJCNT_ENTRY(name) \
372{.label= #name, .counter= &sctp_dbg_objcnt_## name}
373
13d782f6
EB		 374void sctp_dbg_objcnt_init(struct net *);
375void sctp_dbg_objcnt_exit(struct net *);
1da177e4
LT		 376
377#else
378
379#define SCTP_DBG_OBJCNT_INC(name)
380#define SCTP_DBG_OBJCNT_DEC(name)
381
1f07b62f
CW		 382static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
383static inline void sctp_dbg_objcnt_exit(struct net *net) { return; }
1da177e4
LT		 384
385#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
386
387#if defined CONFIG_SYSCTL
388void sctp_sysctl_register(void);
389void sctp_sysctl_unregister(void);
ebb7e95d
EB		 390int sctp_sysctl_net_register(struct net *net);
391void sctp_sysctl_net_unregister(struct net *net);
1da177e4
LT		 392#else
393static inline void sctp_sysctl_register(void) { return; }
394static inline void sctp_sysctl_unregister(void) { return; }
ebb7e95d
EB		 395static inline int sctp_sysctl_net_register(struct net *net) { return 0; }
396static inline void sctp_sysctl_net_unregister(struct net *net) { return; }
1da177e4
LT		 397#endif
398
399/* Size of Supported Address Parameter for 'x' address types. */
400#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
401
dfd56b8b 402#if IS_ENABLED(CONFIG_IPV6)
1da177e4 403
270637ab
VY		 404void sctp_v6_pf_init(void);
405void sctp_v6_pf_exit(void);
406int sctp_v6_protosw_init(void);
407void sctp_v6_protosw_exit(void);
827bf122
SS		 408int sctp_v6_add_protocol(void);
409void sctp_v6_del_protocol(void);
1da177e4
LT		 410
411#else /* #ifdef defined(CONFIG_IPV6) */
412
1233823b 413static inline void sctp_v6_pf_init(void) { return; }
270637ab
VY		 414static inline void sctp_v6_pf_exit(void) { return; }
415static inline int sctp_v6_protosw_init(void) { return 0; }
416static inline void sctp_v6_protosw_exit(void) { return; }
827bf122
SS		 417static inline int sctp_v6_add_protocol(void) { return 0; }
418static inline void sctp_v6_del_protocol(void) { return; }
1da177e4
LT		 419
420#endif /* #if defined(CONFIG_IPV6) */
421
1da177e4
LT		 422
423/* Map an association to an assoc_id. */
424static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
425{
a02cec21 426 return asoc ? asoc->assoc_id : 0;
1da177e4
LT		 427}
428
429/* Look up the association by its id. */
430struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
431
0343c554 432int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
1da177e4
LT		 433
434/* A macro to walk a list of skbs. */
435#define sctp_skb_for_each(pos, head, tmp) \
3d09274c 436 skb_queue_walk_safe(head, pos, tmp)
1da177e4
LT		 437
438/* A helper to append an entire skb list (list) to another (head). */
439static inline void sctp_skb_list_tail(struct sk_buff_head *list,
440 struct sk_buff_head *head)
441{
442 unsigned long flags;
443
444 sctp_spin_lock_irqsave(&head->lock, flags);
445 sctp_spin_lock(&list->lock);
446
3d09274c 447 skb_queue_splice_tail_init(list, head);
1da177e4
LT		 448
449 sctp_spin_unlock(&list->lock);
450 sctp_spin_unlock_irqrestore(&head->lock, flags);
451}
452
453/**
454 * sctp_list_dequeue - remove from the head of the queue
455 * @list: list to dequeue from
456 *
457 * Remove the head of the list. The head item is
458 * returned or %NULL if the list is empty.
459 */
460
461static inline struct list_head *sctp_list_dequeue(struct list_head *list)
462{
463 struct list_head *result = NULL;
464
465 if (list->next != list) {
466 result = list->next;
467 list->next = result->next;
468 list->next->prev = list;
469 INIT_LIST_HEAD(result);
470 }
471 return result;
472}
473
331c4ee7
VY		 474/* SCTP version of skb_set_owner_r. We need this one because
475 * of the way we have to do receive buffer accounting on bundled
476 * chunks.
477 */
478static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
479{
480 struct sctp_ulpevent *event = sctp_skb2event(skb);
481
d55d87fd 482 skb_orphan(skb);
331c4ee7
VY		 483 skb->sk = sk;
484 skb->destructor = sctp_sock_rfree;
485 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
4d93df0a 486 /*
3ab224be 487 * This mimics the behavior of skb_set_owner_r
4d93df0a
NH		 488 */
489 sk->sk_forward_alloc -= event->rmem_len;
331c4ee7
VY		 490}
491
1da177e4
LT		 492/* Tests if the list has one and only one entry. */
493static inline int sctp_list_single_entry(struct list_head *head)
494{
a02cec21 495 return (head->next != head) && (head->next == head->prev);
1da177e4
LT		 496}
497
1da177e4
LT		 498/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
499static inline __s32 sctp_jitter(__u32 rto)
500{
501 static __u32 sctp_rand;
502 __s32 ret;
503
504 /* Avoid divide by zero. */
505 if (!rto)
506 rto = 1;
507
508 sctp_rand += jiffies;
509 sctp_rand ^= (sctp_rand << 12);
510 sctp_rand ^= (sctp_rand >> 20);
511
512 /* Choose random number from 0 to rto, then move to -50% ~ +50%
513 * of rto.
514 */
515 ret = sctp_rand % rto - (rto >> 1);
516 return ret;
517}
518
519/* Break down data chunks at this point. */
f68b2e05 520static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
1da177e4 521{
f68b2e05 522 struct sctp_sock *sp = sctp_sk(asoc->base.sk);
1da177e4
LT		 523 int frag = pmtu;
524
525 frag -= sp->pf->af->net_header_len;
526 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
527
f68b2e05
VY		 528 if (asoc->user_frag)
529 frag = min_t(int, frag, asoc->user_frag);
1da177e4
LT		 530
531 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
532
533 return frag;
534}
535
02f3d4ce 536static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc)
8a479491
VY		 537{
538
02f3d4ce 539 sctp_assoc_sync_pmtu(sk, asoc);
8a479491
VY		 540 asoc->pmtu_pending = 0;
541}
542
33291255
DB		 543static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk)
544{
545 return !list_empty(&chunk->list);
546}
547
1da177e4
LT		 548/* Walk through a list of TLV parameters. Don't trust the
549 * individual parameter lengths and instead depend on
550 * the chunk length to indicate when to stop. Make sure
551 * there is room for a param header too.
552 */
553#define sctp_walk_params(pos, chunk, member)\
dd2d1c6f 554_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
1da177e4
LT		 555
556#define _sctp_walk_params(pos, chunk, end, member)\
557for (pos.v = chunk->member;\
2630e5a8 558 (pos.v + offsetof(struct sctp_paramhdr, length) + sizeof(pos.p->length) <=\
3cb637d2 559 (void *)chunk + end) &&\
dd2d1c6f 560 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
1da177e4
LT		 561 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
562 pos.v += WORD_ROUND(ntohs(pos.p->length)))
563
564#define sctp_walk_errors(err, chunk_hdr)\
565_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
566
567#define _sctp_walk_errors(err, chunk_hdr, end)\
568for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
569 sizeof(sctp_chunkhdr_t));\
2630e5a8 570 ((void *)err + offsetof(sctp_errhdr_t, length) + sizeof(err->length) <=\
3cb637d2 571 (void *)chunk_hdr + end) &&\
dd2d1c6f 572 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
1da177e4
LT		 573 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
574 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
575
576#define sctp_walk_fwdtsn(pos, chunk)\
577_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
578
579#define _sctp_walk_fwdtsn(pos, chunk, end)\
580for (pos = chunk->subh.fwdtsn_hdr->skip;\
581 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
582 pos++)
583
584/* Round an int up to the next multiple of 4. */
585#define WORD_ROUND(s) (((s)+3)&~3)
586
587/* Make a new instance of type. */
3b77d661 588#define t_new(type, flags) kzalloc(sizeof(type), flags)
1da177e4
LT		 589
590/* Compare two timevals. */
591#define tv_lt(s, t) \
592 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
593
594/* Add tv1 to tv2. */
595#define TIMEVAL_ADD(tv1, tv2) \
596({ \
597 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
598 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
599\
600 if (usecs >= 1000000) { \
601 usecs -= 1000000; \
602 secs++; \
603 } \
604 (tv2).tv_sec = secs; \
605 (tv2).tv_usec = usecs; \
606})
607
608/* External references. */
609
610extern struct proto sctp_prot;
611extern struct proto sctpv6_prot;
1da177e4
LT		 612void sctp_put_port(struct sock *sk);
613
614extern struct idr sctp_assocs_id;
615extern spinlock_t sctp_assocs_id_lock;
616
617/* Static inline functions. */
618
619/* Convert from an IP version number to an Address Family symbol. */
620static inline int ipver2af(__u8 ipver)
621{
622 switch (ipver) {
623 case 4:
624 return AF_INET;
625 case 6:
626 return AF_INET6;
627 default:
628 return 0;
e3cc055c 629 }
1da177e4
LT		 630}
631
632/* Convert from an address parameter type to an address family. */
dbc16db1 633static inline int param_type2af(__be16 type)
1da177e4
LT		 634{
635 switch (type) {
636 case SCTP_PARAM_IPV4_ADDRESS:
637 return AF_INET;
638 case SCTP_PARAM_IPV6_ADDRESS:
639 return AF_INET6;
640 default:
641 return 0;
e3cc055c 642 }
1da177e4
LT		 643}
644
645/* Perform some sanity checks. */
646static inline int sctp_sanity_check(void)
647{
648 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
649 sizeof(((struct sk_buff *)0)->cb),
650 "SCTP: ulpevent does not fit in skb!\n", return 0);
651
652 return 1;
653}
654
655/* Warning: The following hash functions assume a power of two 'size'. */
656/* This is the hash function for the SCTP port hash table. */
f1f43763 657static inline int sctp_phashfn(struct net *net, __u16 lport)
1da177e4 658{
f1f43763 659 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
1da177e4
LT		 660}
661
662/* This is the hash function for the endpoint hash table. */
4cdadcbc 663static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
1da177e4 664{
4cdadcbc 665 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
1da177e4
LT		 666}
667
668/* This is the hash function for the association hash table. */
4110cc25 669static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport)
1da177e4 670{
4110cc25 671 int h = (lport << 16) + rport + net_hash_mix(net);
1da177e4 672 h ^= h>>8;
a02cec21 673 return h & (sctp_assoc_hashsize - 1);
1da177e4
LT		 674}
675
676/* This is the hash function for the association hash table. This is
677 * not used yet, but could be used as a better hash function when
678 * we have a vtag.
679 */
680static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
681{
682 int h = (lport << 16) + rport;
683 h ^= vtag;
a02cec21 684 return h & (sctp_assoc_hashsize - 1);
1da177e4
LT		 685}
686
b67bfe0d
SL		 687#define sctp_for_each_hentry(epb, head) \
688 hlist_for_each_entry(epb, head, node)
d970dbf8 689
1da177e4
LT		 690/* Is a socket of this style? */
691#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
692static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
693{
694 return sctp_sk(sk)->type == style;
695}
696
697/* Is the association in this state? */
698#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
699static inline int __sctp_state(const struct sctp_association *asoc,
700 sctp_state_t state)
701{
702 return asoc->state == state;
703}
704
705/* Is the socket in this state? */
706#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
707static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
708{
709 return sk->sk_state == state;
710}
711
712/* Map v4-mapped v6 address back to v4 address */
713static inline void sctp_v6_map_v4(union sctp_addr *addr)
714{
715 addr->v4.sin_family = AF_INET;
716 addr->v4.sin_port = addr->v6.sin6_port;
717 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
718}
719
720/* Map v4 address to v4-mapped v6 address */
721static inline void sctp_v4_map_v6(union sctp_addr *addr)
722{
723 addr->v6.sin6_family = AF_INET6;
724 addr->v6.sin6_port = addr->v4.sin_port;
725 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
726 addr->v6.sin6_addr.s6_addr32[0] = 0;
727 addr->v6.sin6_addr.s6_addr32[1] = 0;
728 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
729}
730
e0268868
ND		 731/* The cookie is always 0 since this is how it's used in the
732 * pmtu code.
733 */
734static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
735{
736 if (t->dst && !dst_check(t->dst, 0)) {
737 dst_release(t->dst);
738 t->dst = NULL;
739 }
740
741 return t->dst;
742}
743
1da177e4 744#endif /* __net_sctp_h__ */
kernel source for telekom puls (alcatel/mediatek)