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drivers/net/*: Fix FSF address in file headers
[linux-2.6-block.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):
91705c61 30 * lksctp developers <linux-sctp@vger.kernel.org>
1da177e4 31 *
1da177e4
LT		 32 * Written or modified by:
33 * La Monte H.P. Yarroll <piggy@acm.org>
34 * Xingang Guo <xingang.guo@intel.com>
35 * Jon Grimm <jgrimm@us.ibm.com>
36 * Daisy Chang <daisyc@us.ibm.com>
37 * Sridhar Samudrala <sri@us.ibm.com>
38 * Ardelle Fan <ardelle.fan@intel.com>
39 * Ryan Layer <rmlayer@us.ibm.com>
40 * Kevin Gao <kevin.gao@intel.com>
1da177e4
LT		 41 */
42
43#ifndef __net_sctp_h__
44#define __net_sctp_h__
45
46/* Header Strategy.
47 * Start getting some control over the header file depencies:
48 * includes
49 * constants
50 * structs
51 * prototypes
52 * macros, externs, and inlines
53 *
54 * Move test_frame specific items out of the kernel headers
55 * and into the test frame headers. This is not perfect in any sense
56 * and will continue to evolve.
57 */
58
1da177e4
LT		 59#include <linux/types.h>
60#include <linux/slab.h>
61#include <linux/in.h>
62#include <linux/tty.h>
63#include <linux/proc_fs.h>
64#include <linux/spinlock.h>
65#include <linux/jiffies.h>
66#include <linux/idr.h>
67
dfd56b8b 68#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 69#include <net/ipv6.h>
70#include <net/ip6_route.h>
71#endif
72
73#include <asm/uaccess.h>
74#include <asm/page.h>
75#include <net/sock.h>
76#include <net/snmp.h>
77#include <net/sctp/structs.h>
78#include <net/sctp/constants.h>
79
1da177e4
LT		 80#ifdef CONFIG_IP_SCTP_MODULE
81#define SCTP_PROTOSW_FLAG 0
82#else /* static! */
83#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
84#endif
85
1da177e4
LT		 86/*
87 * Function declarations.
88 */
89
90/*
91 * sctp/protocol.c
92 */
7b584460
JP		 93int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *,
94 sctp_scope_t, gfp_t gfp, int flags);
95struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
96int sctp_register_pf(struct sctp_pf *, sa_family_t);
97void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int);
1da177e4
LT		 98
99/*
100 * sctp/socket.c
101 */
102int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
103int sctp_inet_listen(struct socket *sock, int backlog);
104void sctp_write_space(struct sock *sk);
561b1733 105void sctp_data_ready(struct sock *sk, int len);
1da177e4
LT		 106unsigned int sctp_poll(struct file *file, struct socket *sock,
107 poll_table *wait);
331c4ee7 108void sctp_sock_rfree(struct sk_buff *skb);
914e1c8b
VY		 109void sctp_copy_sock(struct sock *newsk, struct sock *sk,
110 struct sctp_association *asoc);
1748376b 111extern struct percpu_counter sctp_sockets_allocated;
7b584460 112int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
1da177e4
LT		 113
114/*
115 * sctp/primitive.c
116 */
55e26eb9
EB		 117int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg);
118int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg);
119int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg);
120int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg);
121int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg);
122int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg);
1da177e4 123
1da177e4
LT		 124/*
125 * sctp/input.c
126 */
127int sctp_rcv(struct sk_buff *skb);
128void sctp_v4_err(struct sk_buff *skb, u32 info);
129void sctp_hash_established(struct sctp_association *);
130void sctp_unhash_established(struct sctp_association *);
131void sctp_hash_endpoint(struct sctp_endpoint *);
132void sctp_unhash_endpoint(struct sctp_endpoint *);
4110cc25 133struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
d1ad1ff2 134 struct sctphdr *, struct sctp_association **,
1da177e4 135 struct sctp_transport **);
d1ad1ff2 136void sctp_err_finish(struct sock *, struct sctp_association *);
1da177e4
LT		 137void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
138 struct sctp_transport *t, __u32 pmtu);
ec18d9a2
DM		 139void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
140 struct sk_buff *);
1da177e4 141void sctp_icmp_proto_unreachable(struct sock *sk,
1da177e4
LT		 142 struct sctp_association *asoc,
143 struct sctp_transport *t);
c4d2444e
SS		 144void sctp_backlog_migrate(struct sctp_association *assoc,
145 struct sock *oldsk, struct sock *newsk);
1da177e4 146
16164366
AB		 147/*
148 * sctp/proc.c
149 */
13d782f6
EB		 150int sctp_snmp_proc_init(struct net *net);
151void sctp_snmp_proc_exit(struct net *net);
152int sctp_eps_proc_init(struct net *net);
153void sctp_eps_proc_exit(struct net *net);
154int sctp_assocs_proc_init(struct net *net);
155void sctp_assocs_proc_exit(struct net *net);
156int sctp_remaddr_proc_init(struct net *net);
157void sctp_remaddr_proc_exit(struct net *net);
16164366
AB		 158
159
0a5fcb9c 160/*
161 * Module global variables
162 */
163
164 /*
165 * sctp/protocol.c
166 */
167extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
168extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
169
1da177e4
LT		 170/*
171 * Section: Macros, externs, and inlines
172 */
173
1da177e4
LT		 174/* spin lock wrappers. */
175#define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
176#define sctp_spin_unlock_irqrestore(lock, flags) \
177 spin_unlock_irqrestore(lock, flags)
178#define sctp_local_bh_disable() local_bh_disable()
179#define sctp_local_bh_enable() local_bh_enable()
180#define sctp_spin_lock(lock) spin_lock(lock)
181#define sctp_spin_unlock(lock) spin_unlock(lock)
182#define sctp_write_lock(lock) write_lock(lock)
183#define sctp_write_unlock(lock) write_unlock(lock)
184#define sctp_read_lock(lock) read_lock(lock)
185#define sctp_read_unlock(lock) read_unlock(lock)
186
187/* sock lock wrappers. */
188#define sctp_lock_sock(sk) lock_sock(sk)
189#define sctp_release_sock(sk) release_sock(sk)
190#define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
191#define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
1da177e4
LT		 192
193/* SCTP SNMP MIB stats handlers */
b01a2407
EB		 194#define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
195#define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field)
196#define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field)
197#define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
1da177e4 198
ac0b0462 199/* sctp mib definitions */
fd2c3ef7 200enum {
ac0b0462
SS		 201 SCTP_MIB_NUM = 0,
202 SCTP_MIB_CURRESTAB, /* CurrEstab */
203 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
204 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
205 SCTP_MIB_ABORTEDS, /* Aborteds */
206 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
207 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
208 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
209 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
210 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
211 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
212 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
213 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
214 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
215 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
216 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
217 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
218 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
219 SCTP_MIB_T1_INIT_EXPIREDS,
220 SCTP_MIB_T1_COOKIE_EXPIREDS,
221 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
222 SCTP_MIB_T3_RTX_EXPIREDS,
223 SCTP_MIB_T4_RTO_EXPIREDS,
224 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
225 SCTP_MIB_DELAY_SACK_EXPIREDS,
226 SCTP_MIB_AUTOCLOSE_EXPIREDS,
b6157d8e 227 SCTP_MIB_T1_RETRANSMITS,
ac0b0462
SS		 228 SCTP_MIB_T3_RETRANSMITS,
229 SCTP_MIB_PMTUD_RETRANSMITS,
230 SCTP_MIB_FAST_RETRANSMITS,
231 SCTP_MIB_IN_PKT_SOFTIRQ,
232 SCTP_MIB_IN_PKT_BACKLOG,
233 SCTP_MIB_IN_PKT_DISCARDS,
234 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
235 __SCTP_MIB_MAX
236};
237
238#define SCTP_MIB_MAX __SCTP_MIB_MAX
239struct sctp_mib {
240 unsigned long mibs[SCTP_MIB_MAX];
ec733b15 241};
ac0b0462 242
196d6759
MB		 243/* helper function to track stats about max rto and related transport */
244static inline void sctp_max_rto(struct sctp_association *asoc,
245 struct sctp_transport *trans)
246{
247 if (asoc->stats.max_obs_rto < (__u64)trans->rto) {
248 asoc->stats.max_obs_rto = trans->rto;
249 memset(&asoc->stats.obs_rto_ipaddr, 0,
250 sizeof(struct sockaddr_storage));
251 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr,
252 trans->af_specific->sockaddr_len);
253 }
254}
1da177e4 255
1da177e4
LT		 256/*
257 * Macros for keeping a global reference of object allocations.
258 */
259#ifdef CONFIG_SCTP_DBG_OBJCNT
260
261extern atomic_t sctp_dbg_objcnt_sock;
262extern atomic_t sctp_dbg_objcnt_ep;
263extern atomic_t sctp_dbg_objcnt_assoc;
264extern atomic_t sctp_dbg_objcnt_transport;
265extern atomic_t sctp_dbg_objcnt_chunk;
266extern atomic_t sctp_dbg_objcnt_bind_addr;
267extern atomic_t sctp_dbg_objcnt_bind_bucket;
268extern atomic_t sctp_dbg_objcnt_addr;
269extern atomic_t sctp_dbg_objcnt_ssnmap;
270extern atomic_t sctp_dbg_objcnt_datamsg;
1f485649 271extern atomic_t sctp_dbg_objcnt_keys;
1da177e4
LT		 272
273/* Macros to atomically increment/decrement objcnt counters. */
274#define SCTP_DBG_OBJCNT_INC(name) \
275atomic_inc(&sctp_dbg_objcnt_## name)
276#define SCTP_DBG_OBJCNT_DEC(name) \
277atomic_dec(&sctp_dbg_objcnt_## name)
278#define SCTP_DBG_OBJCNT(name) \
279atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
280
281/* Macro to help create new entries in in the global array of
282 * objcnt counters.
283 */
284#define SCTP_DBG_OBJCNT_ENTRY(name) \
285{.label= #name, .counter= &sctp_dbg_objcnt_## name}
286
13d782f6
EB		 287void sctp_dbg_objcnt_init(struct net *);
288void sctp_dbg_objcnt_exit(struct net *);
1da177e4
LT		 289
290#else
291
292#define SCTP_DBG_OBJCNT_INC(name)
293#define SCTP_DBG_OBJCNT_DEC(name)
294
1f07b62f
CW		 295static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
296static inline void sctp_dbg_objcnt_exit(struct net *net) { return; }
1da177e4
LT		 297
298#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
299
300#if defined CONFIG_SYSCTL
301void sctp_sysctl_register(void);
302void sctp_sysctl_unregister(void);
ebb7e95d
EB		 303int sctp_sysctl_net_register(struct net *net);
304void sctp_sysctl_net_unregister(struct net *net);
1da177e4
LT		 305#else
306static inline void sctp_sysctl_register(void) { return; }
307static inline void sctp_sysctl_unregister(void) { return; }
ebb7e95d
EB		 308static inline int sctp_sysctl_net_register(struct net *net) { return 0; }
309static inline void sctp_sysctl_net_unregister(struct net *net) { return; }
1da177e4
LT		 310#endif
311
312/* Size of Supported Address Parameter for 'x' address types. */
313#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
314
dfd56b8b 315#if IS_ENABLED(CONFIG_IPV6)
1da177e4 316
270637ab
VY		 317void sctp_v6_pf_init(void);
318void sctp_v6_pf_exit(void);
319int sctp_v6_protosw_init(void);
320void sctp_v6_protosw_exit(void);
827bf122
SS		 321int sctp_v6_add_protocol(void);
322void sctp_v6_del_protocol(void);
1da177e4
LT		 323
324#else /* #ifdef defined(CONFIG_IPV6) */
325
1233823b 326static inline void sctp_v6_pf_init(void) { return; }
270637ab
VY		 327static inline void sctp_v6_pf_exit(void) { return; }
328static inline int sctp_v6_protosw_init(void) { return 0; }
329static inline void sctp_v6_protosw_exit(void) { return; }
827bf122
SS		 330static inline int sctp_v6_add_protocol(void) { return 0; }
331static inline void sctp_v6_del_protocol(void) { return; }
1da177e4
LT		 332
333#endif /* #if defined(CONFIG_IPV6) */
334
1da177e4
LT		 335
336/* Map an association to an assoc_id. */
337static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
338{
a02cec21 339 return asoc ? asoc->assoc_id : 0;
1da177e4
LT		 340}
341
342/* Look up the association by its id. */
343struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
344
0343c554 345int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
1da177e4
LT		 346
347/* A macro to walk a list of skbs. */
348#define sctp_skb_for_each(pos, head, tmp) \
3d09274c 349 skb_queue_walk_safe(head, pos, tmp)
1da177e4
LT		 350
351/* A helper to append an entire skb list (list) to another (head). */
352static inline void sctp_skb_list_tail(struct sk_buff_head *list,
353 struct sk_buff_head *head)
354{
355 unsigned long flags;
356
357 sctp_spin_lock_irqsave(&head->lock, flags);
358 sctp_spin_lock(&list->lock);
359
3d09274c 360 skb_queue_splice_tail_init(list, head);
1da177e4
LT		 361
362 sctp_spin_unlock(&list->lock);
363 sctp_spin_unlock_irqrestore(&head->lock, flags);
364}
365
366/**
367 * sctp_list_dequeue - remove from the head of the queue
368 * @list: list to dequeue from
369 *
370 * Remove the head of the list. The head item is
371 * returned or %NULL if the list is empty.
372 */
373
374static inline struct list_head *sctp_list_dequeue(struct list_head *list)
375{
376 struct list_head *result = NULL;
377
378 if (list->next != list) {
379 result = list->next;
380 list->next = result->next;
381 list->next->prev = list;
382 INIT_LIST_HEAD(result);
383 }
384 return result;
385}
386
331c4ee7
VY		 387/* SCTP version of skb_set_owner_r. We need this one because
388 * of the way we have to do receive buffer accounting on bundled
389 * chunks.
390 */
391static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
392{
393 struct sctp_ulpevent *event = sctp_skb2event(skb);
394
d55d87fd 395 skb_orphan(skb);
331c4ee7
VY		 396 skb->sk = sk;
397 skb->destructor = sctp_sock_rfree;
398 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
4d93df0a 399 /*
3ab224be 400 * This mimics the behavior of skb_set_owner_r
4d93df0a
NH		 401 */
402 sk->sk_forward_alloc -= event->rmem_len;
331c4ee7
VY		 403}
404
1da177e4
LT		 405/* Tests if the list has one and only one entry. */
406static inline int sctp_list_single_entry(struct list_head *head)
407{
a02cec21 408 return (head->next != head) && (head->next == head->prev);
1da177e4
LT		 409}
410
1da177e4
LT		 411/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
412static inline __s32 sctp_jitter(__u32 rto)
413{
414 static __u32 sctp_rand;
415 __s32 ret;
416
417 /* Avoid divide by zero. */
418 if (!rto)
419 rto = 1;
420
421 sctp_rand += jiffies;
422 sctp_rand ^= (sctp_rand << 12);
423 sctp_rand ^= (sctp_rand >> 20);
424
425 /* Choose random number from 0 to rto, then move to -50% ~ +50%
426 * of rto.
427 */
428 ret = sctp_rand % rto - (rto >> 1);
429 return ret;
430}
431
432/* Break down data chunks at this point. */
f68b2e05 433static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
1da177e4 434{
f68b2e05 435 struct sctp_sock *sp = sctp_sk(asoc->base.sk);
1da177e4
LT		 436 int frag = pmtu;
437
438 frag -= sp->pf->af->net_header_len;
439 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
440
f68b2e05
VY		 441 if (asoc->user_frag)
442 frag = min_t(int, frag, asoc->user_frag);
1da177e4
LT		 443
444 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
445
446 return frag;
447}
448
02f3d4ce 449static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc)
8a479491
VY		 450{
451
02f3d4ce 452 sctp_assoc_sync_pmtu(sk, asoc);
8a479491
VY		 453 asoc->pmtu_pending = 0;
454}
455
1da177e4
LT		 456/* Walk through a list of TLV parameters. Don't trust the
457 * individual parameter lengths and instead depend on
458 * the chunk length to indicate when to stop. Make sure
459 * there is room for a param header too.
460 */
461#define sctp_walk_params(pos, chunk, member)\
dd2d1c6f 462_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
1da177e4
LT		 463
464#define _sctp_walk_params(pos, chunk, end, member)\
465for (pos.v = chunk->member;\
dd2d1c6f 466 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
1da177e4
LT		 467 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
468 pos.v += WORD_ROUND(ntohs(pos.p->length)))
469
470#define sctp_walk_errors(err, chunk_hdr)\
471_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
472
473#define _sctp_walk_errors(err, chunk_hdr, end)\
474for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
475 sizeof(sctp_chunkhdr_t));\
dd2d1c6f 476 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
1da177e4
LT		 477 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
478 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
479
480#define sctp_walk_fwdtsn(pos, chunk)\
481_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
482
483#define _sctp_walk_fwdtsn(pos, chunk, end)\
484for (pos = chunk->subh.fwdtsn_hdr->skip;\
485 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
486 pos++)
487
488/* Round an int up to the next multiple of 4. */
489#define WORD_ROUND(s) (((s)+3)&~3)
490
1da177e4
LT		 491/* External references. */
492
493extern struct proto sctp_prot;
494extern struct proto sctpv6_prot;
1da177e4
LT		 495void sctp_put_port(struct sock *sk);
496
497extern struct idr sctp_assocs_id;
498extern spinlock_t sctp_assocs_id_lock;
499
500/* Static inline functions. */
501
502/* Convert from an IP version number to an Address Family symbol. */
503static inline int ipver2af(__u8 ipver)
504{
505 switch (ipver) {
506 case 4:
507 return AF_INET;
508 case 6:
509 return AF_INET6;
510 default:
511 return 0;
e3cc055c 512 }
1da177e4
LT		 513}
514
515/* Convert from an address parameter type to an address family. */
dbc16db1 516static inline int param_type2af(__be16 type)
1da177e4
LT		 517{
518 switch (type) {
519 case SCTP_PARAM_IPV4_ADDRESS:
520 return AF_INET;
521 case SCTP_PARAM_IPV6_ADDRESS:
522 return AF_INET6;
523 default:
524 return 0;
e3cc055c 525 }
1da177e4
LT		 526}
527
1da177e4
LT		 528/* Warning: The following hash functions assume a power of two 'size'. */
529/* This is the hash function for the SCTP port hash table. */
f1f43763 530static inline int sctp_phashfn(struct net *net, __u16 lport)
1da177e4 531{
f1f43763 532 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
1da177e4
LT		 533}
534
535/* This is the hash function for the endpoint hash table. */
4cdadcbc 536static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
1da177e4 537{
4cdadcbc 538 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
1da177e4
LT		 539}
540
541/* This is the hash function for the association hash table. */
4110cc25 542static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport)
1da177e4 543{
4110cc25 544 int h = (lport << 16) + rport + net_hash_mix(net);
1da177e4 545 h ^= h>>8;
a02cec21 546 return h & (sctp_assoc_hashsize - 1);
1da177e4
LT		 547}
548
549/* This is the hash function for the association hash table. This is
550 * not used yet, but could be used as a better hash function when
551 * we have a vtag.
552 */
553static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
554{
555 int h = (lport << 16) + rport;
556 h ^= vtag;
a02cec21 557 return h & (sctp_assoc_hashsize - 1);
1da177e4
LT		 558}
559
b67bfe0d
SL		 560#define sctp_for_each_hentry(epb, head) \
561 hlist_for_each_entry(epb, head, node)
d970dbf8 562
1da177e4
LT		 563/* Is a socket of this style? */
564#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
565static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
566{
567 return sctp_sk(sk)->type == style;
568}
569
570/* Is the association in this state? */
571#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
572static inline int __sctp_state(const struct sctp_association *asoc,
573 sctp_state_t state)
574{
575 return asoc->state == state;
576}
577
578/* Is the socket in this state? */
579#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
580static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
581{
582 return sk->sk_state == state;
583}
584
585/* Map v4-mapped v6 address back to v4 address */
586static inline void sctp_v6_map_v4(union sctp_addr *addr)
587{
588 addr->v4.sin_family = AF_INET;
589 addr->v4.sin_port = addr->v6.sin6_port;
590 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
591}
592
593/* Map v4 address to v4-mapped v6 address */
594static inline void sctp_v4_map_v6(union sctp_addr *addr)
595{
596 addr->v6.sin6_family = AF_INET6;
597 addr->v6.sin6_port = addr->v4.sin_port;
598 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
599 addr->v6.sin6_addr.s6_addr32[0] = 0;
600 addr->v6.sin6_addr.s6_addr32[1] = 0;
601 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
602}
603
e0268868
ND		 604/* The cookie is always 0 since this is how it's used in the
605 * pmtu code.
606 */
607static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
608{
d27fc782 609 if (t->dst && !dst_check(t->dst, t->dst_cookie)) {
e0268868
ND		 610 dst_release(t->dst);
611 t->dst = NULL;
612 }
613
614 return t->dst;
615}
616
1da177e4 617#endif /* __net_sctp_h__ */
Linux 6.x block layer and io_uring tree(s)