1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
7 * This file is part of the SCTP kernel implementation
9 * The base lksctp header.
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
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.
28 * Please send any bug reports or fixes you make to the
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
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>
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
49 #ifndef __net_sctp_h__
50 #define __net_sctp_h__
53 * Start getting some control over the header file depencies:
58 * macros, externs, and inlines
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.
65 #include <linux/types.h>
66 #include <linux/slab.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>
74 #if IS_ENABLED(CONFIG_IPV6)
76 #include <net/ip6_route.h>
79 #include <asm/uaccess.h>
83 #include <net/sctp/structs.h>
84 #include <net/sctp/constants.h>
87 /* Set SCTP_DEBUG flag via config if not already set. */
89 #ifdef CONFIG_SCTP_DBG_MSG
93 #endif /* CONFIG_SCTP_DBG */
94 #endif /* SCTP_DEBUG */
96 #ifdef CONFIG_IP_SCTP_MODULE
97 #define SCTP_PROTOSW_FLAG 0
99 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
103 * Function declarations.
109 extern int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *,
110 sctp_scope_t, gfp_t gfp,
112 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
113 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
114 extern void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int);
119 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
120 int sctp_inet_listen(struct socket *sock, int backlog);
121 void sctp_write_space(struct sock *sk);
122 void sctp_data_ready(struct sock *sk, int len);
123 unsigned int sctp_poll(struct file *file, struct socket *sock,
125 void sctp_sock_rfree(struct sk_buff *skb);
126 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
127 struct sctp_association *asoc);
128 extern struct percpu_counter sctp_sockets_allocated;
129 extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
134 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg);
135 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg);
136 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg);
137 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg);
138 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg);
139 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg);
144 int sctp_rcv(struct sk_buff *skb);
145 void sctp_v4_err(struct sk_buff *skb, u32 info);
146 void sctp_hash_established(struct sctp_association *);
147 void sctp_unhash_established(struct sctp_association *);
148 void sctp_hash_endpoint(struct sctp_endpoint *);
149 void sctp_unhash_endpoint(struct sctp_endpoint *);
150 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
151 struct sctphdr *, struct sctp_association **,
152 struct sctp_transport **);
153 void sctp_err_finish(struct sock *, struct sctp_association *);
154 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
155 struct sctp_transport *t, __u32 pmtu);
156 void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
158 void sctp_icmp_proto_unreachable(struct sock *sk,
159 struct sctp_association *asoc,
160 struct sctp_transport *t);
161 void sctp_backlog_migrate(struct sctp_association *assoc,
162 struct sock *oldsk, struct sock *newsk);
167 int sctp_snmp_proc_init(struct net *net);
168 void sctp_snmp_proc_exit(struct net *net);
169 int sctp_eps_proc_init(struct net *net);
170 void sctp_eps_proc_exit(struct net *net);
171 int sctp_assocs_proc_init(struct net *net);
172 void sctp_assocs_proc_exit(struct net *net);
173 int sctp_remaddr_proc_init(struct net *net);
174 void sctp_remaddr_proc_exit(struct net *net);
178 * Module global variables
184 extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
185 extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
188 * Section: Macros, externs, and inlines
191 /* spin lock wrappers. */
192 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
193 #define sctp_spin_unlock_irqrestore(lock, flags) \
194 spin_unlock_irqrestore(lock, flags)
195 #define sctp_local_bh_disable() local_bh_disable()
196 #define sctp_local_bh_enable() local_bh_enable()
197 #define sctp_spin_lock(lock) spin_lock(lock)
198 #define sctp_spin_unlock(lock) spin_unlock(lock)
199 #define sctp_write_lock(lock) write_lock(lock)
200 #define sctp_write_unlock(lock) write_unlock(lock)
201 #define sctp_read_lock(lock) read_lock(lock)
202 #define sctp_read_unlock(lock) read_unlock(lock)
204 /* sock lock wrappers. */
205 #define sctp_lock_sock(sk) lock_sock(sk)
206 #define sctp_release_sock(sk) release_sock(sk)
207 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
208 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
210 /* SCTP SNMP MIB stats handlers */
211 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
212 #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field)
213 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field)
214 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
216 /* sctp mib definitions */
219 SCTP_MIB_CURRESTAB, /* CurrEstab */
220 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
221 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
222 SCTP_MIB_ABORTEDS, /* Aborteds */
223 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
224 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
225 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
226 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
227 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
228 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
229 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
230 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
231 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
232 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
233 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
234 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
235 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
236 SCTP_MIB_T1_INIT_EXPIREDS,
237 SCTP_MIB_T1_COOKIE_EXPIREDS,
238 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
239 SCTP_MIB_T3_RTX_EXPIREDS,
240 SCTP_MIB_T4_RTO_EXPIREDS,
241 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
242 SCTP_MIB_DELAY_SACK_EXPIREDS,
243 SCTP_MIB_AUTOCLOSE_EXPIREDS,
244 SCTP_MIB_T1_RETRANSMITS,
245 SCTP_MIB_T3_RETRANSMITS,
246 SCTP_MIB_PMTUD_RETRANSMITS,
247 SCTP_MIB_FAST_RETRANSMITS,
248 SCTP_MIB_IN_PKT_SOFTIRQ,
249 SCTP_MIB_IN_PKT_BACKLOG,
250 SCTP_MIB_IN_PKT_DISCARDS,
251 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
255 #define SCTP_MIB_MAX __SCTP_MIB_MAX
257 unsigned long mibs[SCTP_MIB_MAX];
260 /* helper function to track stats about max rto and related transport */
261 static inline void sctp_max_rto(struct sctp_association *asoc,
262 struct sctp_transport *trans)
264 if (asoc->stats.max_obs_rto < (__u64)trans->rto) {
265 asoc->stats.max_obs_rto = trans->rto;
266 memset(&asoc->stats.obs_rto_ipaddr, 0,
267 sizeof(struct sockaddr_storage));
268 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr,
269 trans->af_specific->sockaddr_len);
273 /* Print debugging messages. */
275 extern int sctp_debug_flag;
276 #define SCTP_DEBUG_PRINTK(fmt, args...) \
278 if (sctp_debug_flag) \
279 printk(KERN_DEBUG pr_fmt(fmt), ##args); \
281 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \
283 if (sctp_debug_flag) \
284 pr_cont(fmt, ##args); \
286 #define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \
287 args_lead, addr, args_trail...) \
289 const union sctp_addr *_addr = (addr); \
290 if (sctp_debug_flag) { \
291 if (_addr->sa.sa_family == AF_INET6) { \
293 pr_fmt(fmt_lead "%pI6" fmt_trail), \
295 &_addr->v6.sin6_addr, \
299 pr_fmt(fmt_lead "%pI4" fmt_trail), \
301 &_addr->v4.sin_addr.s_addr, \
306 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
307 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
309 #define SCTP_ASSERT(expr, str, func) \
311 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
312 str, (#expr), __FILE__, __func__, __LINE__); \
316 #else /* SCTP_DEBUG */
318 #define SCTP_DEBUG_PRINTK(whatever...)
319 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
320 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
321 #define SCTP_ENABLE_DEBUG
322 #define SCTP_DISABLE_DEBUG
323 #define SCTP_ASSERT(expr, str, func)
325 #endif /* SCTP_DEBUG */
329 * Macros for keeping a global reference of object allocations.
331 #ifdef CONFIG_SCTP_DBG_OBJCNT
333 extern atomic_t sctp_dbg_objcnt_sock;
334 extern atomic_t sctp_dbg_objcnt_ep;
335 extern atomic_t sctp_dbg_objcnt_assoc;
336 extern atomic_t sctp_dbg_objcnt_transport;
337 extern atomic_t sctp_dbg_objcnt_chunk;
338 extern atomic_t sctp_dbg_objcnt_bind_addr;
339 extern atomic_t sctp_dbg_objcnt_bind_bucket;
340 extern atomic_t sctp_dbg_objcnt_addr;
341 extern atomic_t sctp_dbg_objcnt_ssnmap;
342 extern atomic_t sctp_dbg_objcnt_datamsg;
343 extern atomic_t sctp_dbg_objcnt_keys;
345 /* Macros to atomically increment/decrement objcnt counters. */
346 #define SCTP_DBG_OBJCNT_INC(name) \
347 atomic_inc(&sctp_dbg_objcnt_## name)
348 #define SCTP_DBG_OBJCNT_DEC(name) \
349 atomic_dec(&sctp_dbg_objcnt_## name)
350 #define SCTP_DBG_OBJCNT(name) \
351 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
353 /* Macro to help create new entries in in the global array of
356 #define SCTP_DBG_OBJCNT_ENTRY(name) \
357 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
359 void sctp_dbg_objcnt_init(struct net *);
360 void sctp_dbg_objcnt_exit(struct net *);
364 #define SCTP_DBG_OBJCNT_INC(name)
365 #define SCTP_DBG_OBJCNT_DEC(name)
367 static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
368 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; }
370 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
372 #if defined CONFIG_SYSCTL
373 void sctp_sysctl_register(void);
374 void sctp_sysctl_unregister(void);
375 int sctp_sysctl_net_register(struct net *net);
376 void sctp_sysctl_net_unregister(struct net *net);
378 static inline void sctp_sysctl_register(void) { return; }
379 static inline void sctp_sysctl_unregister(void) { return; }
380 static inline int sctp_sysctl_net_register(struct net *net) { return 0; }
381 static inline void sctp_sysctl_net_unregister(struct net *net) { return; }
384 /* Size of Supported Address Parameter for 'x' address types. */
385 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
387 #if IS_ENABLED(CONFIG_IPV6)
389 void sctp_v6_pf_init(void);
390 void sctp_v6_pf_exit(void);
391 int sctp_v6_protosw_init(void);
392 void sctp_v6_protosw_exit(void);
393 int sctp_v6_add_protocol(void);
394 void sctp_v6_del_protocol(void);
396 #else /* #ifdef defined(CONFIG_IPV6) */
398 static inline void sctp_v6_pf_init(void) { return; }
399 static inline void sctp_v6_pf_exit(void) { return; }
400 static inline int sctp_v6_protosw_init(void) { return 0; }
401 static inline void sctp_v6_protosw_exit(void) { return; }
402 static inline int sctp_v6_add_protocol(void) { return 0; }
403 static inline void sctp_v6_del_protocol(void) { return; }
405 #endif /* #if defined(CONFIG_IPV6) */
408 /* Map an association to an assoc_id. */
409 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
411 return asoc ? asoc->assoc_id : 0;
414 /* Look up the association by its id. */
415 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
417 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
419 /* A macro to walk a list of skbs. */
420 #define sctp_skb_for_each(pos, head, tmp) \
421 skb_queue_walk_safe(head, pos, tmp)
423 /* A helper to append an entire skb list (list) to another (head). */
424 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
425 struct sk_buff_head *head)
429 sctp_spin_lock_irqsave(&head->lock, flags);
430 sctp_spin_lock(&list->lock);
432 skb_queue_splice_tail_init(list, head);
434 sctp_spin_unlock(&list->lock);
435 sctp_spin_unlock_irqrestore(&head->lock, flags);
439 * sctp_list_dequeue - remove from the head of the queue
440 * @list: list to dequeue from
442 * Remove the head of the list. The head item is
443 * returned or %NULL if the list is empty.
446 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
448 struct list_head *result = NULL;
450 if (list->next != list) {
452 list->next = result->next;
453 list->next->prev = list;
454 INIT_LIST_HEAD(result);
459 /* SCTP version of skb_set_owner_r. We need this one because
460 * of the way we have to do receive buffer accounting on bundled
463 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
465 struct sctp_ulpevent *event = sctp_skb2event(skb);
469 skb->destructor = sctp_sock_rfree;
470 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
472 * This mimics the behavior of skb_set_owner_r
474 sk->sk_forward_alloc -= event->rmem_len;
477 /* Tests if the list has one and only one entry. */
478 static inline int sctp_list_single_entry(struct list_head *head)
480 return (head->next != head) && (head->next == head->prev);
483 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
484 static inline __s32 sctp_jitter(__u32 rto)
486 static __u32 sctp_rand;
489 /* Avoid divide by zero. */
493 sctp_rand += jiffies;
494 sctp_rand ^= (sctp_rand << 12);
495 sctp_rand ^= (sctp_rand >> 20);
497 /* Choose random number from 0 to rto, then move to -50% ~ +50%
500 ret = sctp_rand % rto - (rto >> 1);
504 /* Break down data chunks at this point. */
505 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
507 struct sctp_sock *sp = sctp_sk(asoc->base.sk);
510 frag -= sp->pf->af->net_header_len;
511 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
514 frag = min_t(int, frag, asoc->user_frag);
516 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
521 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc)
524 sctp_assoc_sync_pmtu(sk, asoc);
525 asoc->pmtu_pending = 0;
528 /* Walk through a list of TLV parameters. Don't trust the
529 * individual parameter lengths and instead depend on
530 * the chunk length to indicate when to stop. Make sure
531 * there is room for a param header too.
533 #define sctp_walk_params(pos, chunk, member)\
534 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
536 #define _sctp_walk_params(pos, chunk, end, member)\
537 for (pos.v = chunk->member;\
538 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
539 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
540 pos.v += WORD_ROUND(ntohs(pos.p->length)))
542 #define sctp_walk_errors(err, chunk_hdr)\
543 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
545 #define _sctp_walk_errors(err, chunk_hdr, end)\
546 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
547 sizeof(sctp_chunkhdr_t));\
548 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
549 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
550 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
552 #define sctp_walk_fwdtsn(pos, chunk)\
553 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
555 #define _sctp_walk_fwdtsn(pos, chunk, end)\
556 for (pos = chunk->subh.fwdtsn_hdr->skip;\
557 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
560 /* Round an int up to the next multiple of 4. */
561 #define WORD_ROUND(s) (((s)+3)&~3)
563 /* Compare two timevals. */
564 #define tv_lt(s, t) \
565 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
567 /* Add tv1 to tv2. */
568 #define TIMEVAL_ADD(tv1, tv2) \
570 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
571 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
573 if (usecs >= 1000000) { \
577 (tv2).tv_sec = secs; \
578 (tv2).tv_usec = usecs; \
581 /* External references. */
583 extern struct proto sctp_prot;
584 extern struct proto sctpv6_prot;
585 void sctp_put_port(struct sock *sk);
587 extern struct idr sctp_assocs_id;
588 extern spinlock_t sctp_assocs_id_lock;
590 /* Static inline functions. */
592 /* Convert from an IP version number to an Address Family symbol. */
593 static inline int ipver2af(__u8 ipver)
605 /* Convert from an address parameter type to an address family. */
606 static inline int param_type2af(__be16 type)
609 case SCTP_PARAM_IPV4_ADDRESS:
611 case SCTP_PARAM_IPV6_ADDRESS:
618 /* Perform some sanity checks. */
619 static inline int sctp_sanity_check(void)
621 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
622 sizeof(((struct sk_buff *)0)->cb),
623 "SCTP: ulpevent does not fit in skb!\n", return 0);
628 /* Warning: The following hash functions assume a power of two 'size'. */
629 /* This is the hash function for the SCTP port hash table. */
630 static inline int sctp_phashfn(struct net *net, __u16 lport)
632 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
635 /* This is the hash function for the endpoint hash table. */
636 static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
638 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
641 /* This is the hash function for the association hash table. */
642 static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport)
644 int h = (lport << 16) + rport + net_hash_mix(net);
646 return h & (sctp_assoc_hashsize - 1);
649 /* This is the hash function for the association hash table. This is
650 * not used yet, but could be used as a better hash function when
653 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
655 int h = (lport << 16) + rport;
657 return h & (sctp_assoc_hashsize - 1);
660 #define sctp_for_each_hentry(epb, head) \
661 hlist_for_each_entry(epb, head, node)
663 /* Is a socket of this style? */
664 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
665 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
667 return sctp_sk(sk)->type == style;
670 /* Is the association in this state? */
671 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
672 static inline int __sctp_state(const struct sctp_association *asoc,
675 return asoc->state == state;
678 /* Is the socket in this state? */
679 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
680 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
682 return sk->sk_state == state;
685 /* Map v4-mapped v6 address back to v4 address */
686 static inline void sctp_v6_map_v4(union sctp_addr *addr)
688 addr->v4.sin_family = AF_INET;
689 addr->v4.sin_port = addr->v6.sin6_port;
690 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
693 /* Map v4 address to v4-mapped v6 address */
694 static inline void sctp_v4_map_v6(union sctp_addr *addr)
696 addr->v6.sin6_family = AF_INET6;
697 addr->v6.sin6_port = addr->v4.sin_port;
698 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
699 addr->v6.sin6_addr.s6_addr32[0] = 0;
700 addr->v6.sin6_addr.s6_addr32[1] = 0;
701 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
704 /* The cookie is always 0 since this is how it's used in the
707 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
709 if (t->dst && !dst_check(t->dst, 0)) {
717 #endif /* __net_sctp_h__ */