1 /* SCTP kernel reference 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 reference Implementation
9 * The base lksctp header.
11 * The SCTP reference 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 * The SCTP reference 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.
69 #undef CONFIG_SCTP_DBG_OBJCNT
71 #endif /* TEST_FRAME */
73 #include <linux/types.h>
74 #include <linux/slab.h>
76 #include <linux/tty.h>
77 #include <linux/proc_fs.h>
78 #include <linux/spinlock.h>
79 #include <linux/jiffies.h>
80 #include <linux/idr.h>
82 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
84 #include <net/ip6_route.h>
87 #include <asm/uaccess.h>
91 #include <net/sctp/structs.h>
92 #include <net/sctp/constants.h>
95 /* Set SCTP_DEBUG flag via config if not already set. */
97 #ifdef CONFIG_SCTP_DBG_MSG
101 #endif /* CONFIG_SCTP_DBG */
102 #endif /* SCTP_DEBUG */
104 #ifdef CONFIG_IP_SCTP_MODULE
105 #define SCTP_PROTOSW_FLAG 0
107 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
111 /* Certain internal static functions need to be exported when
112 * compiled into the test frame.
115 #define SCTP_STATIC static
119 * Function declarations.
125 extern struct sock *sctp_get_ctl_sock(void);
126 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
127 sctp_scope_t, gfp_t gfp,
129 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
130 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
131 int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
137 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
138 int sctp_inet_listen(struct socket *sock, int backlog);
139 void sctp_write_space(struct sock *sk);
140 unsigned int sctp_poll(struct file *file, struct socket *sock,
142 void sctp_sock_rfree(struct sk_buff *skb);
147 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
148 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
149 int sctp_primitive_ABORT(struct sctp_association *, void *arg);
150 int sctp_primitive_SEND(struct sctp_association *, void *arg);
151 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
152 int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
157 __u32 sctp_start_cksum(__u8 *ptr, __u16 count);
158 __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum);
159 __u32 sctp_end_cksum(__u32 cksum);
160 __u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum);
165 int sctp_rcv(struct sk_buff *skb);
166 void sctp_v4_err(struct sk_buff *skb, u32 info);
167 void sctp_hash_established(struct sctp_association *);
168 void sctp_unhash_established(struct sctp_association *);
169 void sctp_hash_endpoint(struct sctp_endpoint *);
170 void sctp_unhash_endpoint(struct sctp_endpoint *);
171 struct sock *sctp_err_lookup(int family, struct sk_buff *,
172 struct sctphdr *, struct sctp_association **,
173 struct sctp_transport **);
174 void sctp_err_finish(struct sock *, struct sctp_association *);
175 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
176 struct sctp_transport *t, __u32 pmtu);
177 void sctp_icmp_proto_unreachable(struct sock *sk,
178 struct sctp_association *asoc,
179 struct sctp_transport *t);
180 void sctp_backlog_migrate(struct sctp_association *assoc,
181 struct sock *oldsk, struct sock *newsk);
186 int sctp_snmp_proc_init(void);
187 void sctp_snmp_proc_exit(void);
188 int sctp_eps_proc_init(void);
189 void sctp_eps_proc_exit(void);
190 int sctp_assocs_proc_init(void);
191 void sctp_assocs_proc_exit(void);
195 * Section: Macros, externs, and inlines
200 #include <test_frame.h>
203 /* spin lock wrappers. */
204 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
205 #define sctp_spin_unlock_irqrestore(lock, flags) \
206 spin_unlock_irqrestore(lock, flags)
207 #define sctp_local_bh_disable() local_bh_disable()
208 #define sctp_local_bh_enable() local_bh_enable()
209 #define sctp_spin_lock(lock) spin_lock(lock)
210 #define sctp_spin_unlock(lock) spin_unlock(lock)
211 #define sctp_write_lock(lock) write_lock(lock)
212 #define sctp_write_unlock(lock) write_unlock(lock)
213 #define sctp_read_lock(lock) read_lock(lock)
214 #define sctp_read_unlock(lock) read_unlock(lock)
216 /* sock lock wrappers. */
217 #define sctp_lock_sock(sk) lock_sock(sk)
218 #define sctp_release_sock(sk) release_sock(sk)
219 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
220 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
221 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk)
222 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk)
224 /* SCTP SNMP MIB stats handlers */
225 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
226 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field)
227 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field)
228 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
229 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field)
231 #endif /* !TEST_FRAME */
233 /* sctp mib definitions */
237 SCTP_MIB_CURRESTAB, /* CurrEstab */
238 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
239 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
240 SCTP_MIB_ABORTEDS, /* Aborteds */
241 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
242 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
243 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
244 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
245 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
246 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
247 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
248 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
249 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
250 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
251 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
252 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
253 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
254 SCTP_MIB_T1_INIT_EXPIREDS,
255 SCTP_MIB_T1_COOKIE_EXPIREDS,
256 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
257 SCTP_MIB_T3_RTX_EXPIREDS,
258 SCTP_MIB_T4_RTO_EXPIREDS,
259 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
260 SCTP_MIB_DELAY_SACK_EXPIREDS,
261 SCTP_MIB_AUTOCLOSE_EXPIREDS,
262 SCTP_MIB_T3_RETRANSMITS,
263 SCTP_MIB_PMTUD_RETRANSMITS,
264 SCTP_MIB_FAST_RETRANSMITS,
265 SCTP_MIB_IN_PKT_SOFTIRQ,
266 SCTP_MIB_IN_PKT_BACKLOG,
267 SCTP_MIB_IN_PKT_DISCARDS,
268 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
272 #define SCTP_MIB_MAX __SCTP_MIB_MAX
274 unsigned long mibs[SCTP_MIB_MAX];
275 } __SNMP_MIB_ALIGN__;
278 /* Print debugging messages. */
280 extern int sctp_debug_flag;
281 #define SCTP_DEBUG_PRINTK(whatever...) \
282 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
283 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \
284 if (sctp_debug_flag) { \
285 if (saddr->sa.sa_family == AF_INET6) { \
287 lead NIP6_FMT trail, \
289 NIP6(saddr->v6.sin6_addr), \
293 lead NIPQUAD_FMT trail, \
295 NIPQUAD(saddr->v4.sin_addr.s_addr), \
299 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
300 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
302 #define SCTP_ASSERT(expr, str, func) \
304 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
305 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \
309 #else /* SCTP_DEBUG */
311 #define SCTP_DEBUG_PRINTK(whatever...)
312 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
313 #define SCTP_ENABLE_DEBUG
314 #define SCTP_DISABLE_DEBUG
315 #define SCTP_ASSERT(expr, str, func)
317 #endif /* SCTP_DEBUG */
321 * Macros for keeping a global reference of object allocations.
323 #ifdef CONFIG_SCTP_DBG_OBJCNT
325 extern atomic_t sctp_dbg_objcnt_sock;
326 extern atomic_t sctp_dbg_objcnt_ep;
327 extern atomic_t sctp_dbg_objcnt_assoc;
328 extern atomic_t sctp_dbg_objcnt_transport;
329 extern atomic_t sctp_dbg_objcnt_chunk;
330 extern atomic_t sctp_dbg_objcnt_bind_addr;
331 extern atomic_t sctp_dbg_objcnt_bind_bucket;
332 extern atomic_t sctp_dbg_objcnt_addr;
333 extern atomic_t sctp_dbg_objcnt_ssnmap;
334 extern atomic_t sctp_dbg_objcnt_datamsg;
336 /* Macros to atomically increment/decrement objcnt counters. */
337 #define SCTP_DBG_OBJCNT_INC(name) \
338 atomic_inc(&sctp_dbg_objcnt_## name)
339 #define SCTP_DBG_OBJCNT_DEC(name) \
340 atomic_dec(&sctp_dbg_objcnt_## name)
341 #define SCTP_DBG_OBJCNT(name) \
342 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
344 /* Macro to help create new entries in in the global array of
347 #define SCTP_DBG_OBJCNT_ENTRY(name) \
348 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
350 void sctp_dbg_objcnt_init(void);
351 void sctp_dbg_objcnt_exit(void);
355 #define SCTP_DBG_OBJCNT_INC(name)
356 #define SCTP_DBG_OBJCNT_DEC(name)
358 static inline void sctp_dbg_objcnt_init(void) { return; }
359 static inline void sctp_dbg_objcnt_exit(void) { return; }
361 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
363 #if defined CONFIG_SYSCTL
364 void sctp_sysctl_register(void);
365 void sctp_sysctl_unregister(void);
367 static inline void sctp_sysctl_register(void) { return; }
368 static inline void sctp_sysctl_unregister(void) { return; }
369 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
370 void __user *oldval, size_t __user *oldlenp,
371 void __user *newval, size_t newlen) {
376 /* Size of Supported Address Parameter for 'x' address types. */
377 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
379 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
381 int sctp_v6_init(void);
382 void sctp_v6_exit(void);
384 #else /* #ifdef defined(CONFIG_IPV6) */
386 static inline int sctp_v6_init(void) { return 0; }
387 static inline void sctp_v6_exit(void) { return; }
389 #endif /* #if defined(CONFIG_IPV6) */
392 /* Map an association to an assoc_id. */
393 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
395 return (asoc?asoc->assoc_id:0);
398 /* Look up the association by its id. */
399 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
402 /* A macro to walk a list of skbs. */
403 #define sctp_skb_for_each(pos, head, tmp) \
404 for (pos = (head)->next;\
405 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\
409 /* A helper to append an entire skb list (list) to another (head). */
410 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
411 struct sk_buff_head *head)
415 sctp_spin_lock_irqsave(&head->lock, flags);
416 sctp_spin_lock(&list->lock);
418 list_splice((struct list_head *)list, (struct list_head *)head->prev);
420 head->qlen += list->qlen;
423 sctp_spin_unlock(&list->lock);
424 sctp_spin_unlock_irqrestore(&head->lock, flags);
428 * sctp_list_dequeue - remove from the head of the queue
429 * @list: list to dequeue from
431 * Remove the head of the list. The head item is
432 * returned or %NULL if the list is empty.
435 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
437 struct list_head *result = NULL;
439 if (list->next != list) {
441 list->next = result->next;
442 list->next->prev = list;
443 INIT_LIST_HEAD(result);
448 /* SCTP version of skb_set_owner_r. We need this one because
449 * of the way we have to do receive buffer accounting on bundled
452 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
454 struct sctp_ulpevent *event = sctp_skb2event(skb);
457 skb->destructor = sctp_sock_rfree;
458 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
461 /* Tests if the list has one and only one entry. */
462 static inline int sctp_list_single_entry(struct list_head *head)
464 return ((head->next != head) && (head->next == head->prev));
467 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
468 static inline __s32 sctp_jitter(__u32 rto)
470 static __u32 sctp_rand;
473 /* Avoid divide by zero. */
477 sctp_rand += jiffies;
478 sctp_rand ^= (sctp_rand << 12);
479 sctp_rand ^= (sctp_rand >> 20);
481 /* Choose random number from 0 to rto, then move to -50% ~ +50%
484 ret = sctp_rand % rto - (rto >> 1);
488 /* Break down data chunks at this point. */
489 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu)
493 frag -= sp->pf->af->net_header_len;
494 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
497 frag = min_t(int, frag, sp->user_frag);
499 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
504 /* Walk through a list of TLV parameters. Don't trust the
505 * individual parameter lengths and instead depend on
506 * the chunk length to indicate when to stop. Make sure
507 * there is room for a param header too.
509 #define sctp_walk_params(pos, chunk, member)\
510 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
512 #define _sctp_walk_params(pos, chunk, end, member)\
513 for (pos.v = chunk->member;\
514 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\
515 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
516 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
517 pos.v += WORD_ROUND(ntohs(pos.p->length)))
519 #define sctp_walk_errors(err, chunk_hdr)\
520 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
522 #define _sctp_walk_errors(err, chunk_hdr, end)\
523 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
524 sizeof(sctp_chunkhdr_t));\
525 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\
526 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
527 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
528 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
530 #define sctp_walk_fwdtsn(pos, chunk)\
531 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
533 #define _sctp_walk_fwdtsn(pos, chunk, end)\
534 for (pos = chunk->subh.fwdtsn_hdr->skip;\
535 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
538 /* Round an int up to the next multiple of 4. */
539 #define WORD_ROUND(s) (((s)+3)&~3)
541 /* Make a new instance of type. */
542 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags)
544 /* Compare two timevals. */
545 #define tv_lt(s, t) \
546 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
548 /* Add tv1 to tv2. */
549 #define TIMEVAL_ADD(tv1, tv2) \
551 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
552 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
554 if (usecs >= 1000000) { \
558 (tv2).tv_sec = secs; \
559 (tv2).tv_usec = usecs; \
562 /* External references. */
564 extern struct proto sctp_prot;
565 extern struct proto sctpv6_prot;
566 extern struct proc_dir_entry *proc_net_sctp;
567 void sctp_put_port(struct sock *sk);
569 extern struct idr sctp_assocs_id;
570 extern spinlock_t sctp_assocs_id_lock;
572 /* Static inline functions. */
574 /* Convert from an IP version number to an Address Family symbol. */
575 static inline int ipver2af(__u8 ipver)
587 /* Convert from an address parameter type to an address family. */
588 static inline int param_type2af(__be16 type)
591 case SCTP_PARAM_IPV4_ADDRESS:
593 case SCTP_PARAM_IPV6_ADDRESS:
600 /* Perform some sanity checks. */
601 static inline int sctp_sanity_check(void)
603 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
604 sizeof(((struct sk_buff *)0)->cb),
605 "SCTP: ulpevent does not fit in skb!\n", return 0);
610 /* Warning: The following hash functions assume a power of two 'size'. */
611 /* This is the hash function for the SCTP port hash table. */
612 static inline int sctp_phashfn(__u16 lport)
614 return (lport & (sctp_port_hashsize - 1));
617 /* This is the hash function for the endpoint hash table. */
618 static inline int sctp_ep_hashfn(__u16 lport)
620 return (lport & (sctp_ep_hashsize - 1));
623 /* This is the hash function for the association hash table. */
624 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
626 int h = (lport << 16) + rport;
628 return (h & (sctp_assoc_hashsize - 1));
631 /* This is the hash function for the association hash table. This is
632 * not used yet, but could be used as a better hash function when
635 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
637 int h = (lport << 16) + rport;
639 return (h & (sctp_assoc_hashsize-1));
642 /* Is a socket of this style? */
643 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
644 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
646 return sctp_sk(sk)->type == style;
649 /* Is the association in this state? */
650 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
651 static inline int __sctp_state(const struct sctp_association *asoc,
654 return asoc->state == state;
657 /* Is the socket in this state? */
658 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
659 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
661 return sk->sk_state == state;
664 /* Map v4-mapped v6 address back to v4 address */
665 static inline void sctp_v6_map_v4(union sctp_addr *addr)
667 addr->v4.sin_family = AF_INET;
668 addr->v4.sin_port = addr->v6.sin6_port;
669 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
672 /* Map v4 address to v4-mapped v6 address */
673 static inline void sctp_v4_map_v6(union sctp_addr *addr)
675 addr->v6.sin6_family = AF_INET6;
676 addr->v6.sin6_port = addr->v4.sin_port;
677 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
678 addr->v6.sin6_addr.s6_addr32[0] = 0;
679 addr->v6.sin6_addr.s6_addr32[1] = 0;
680 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
683 #endif /* __net_sctp_h__ */