1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /* SCTP kernel implementation
3  * (C) Copyright IBM Corp. 2001, 2004
4  * Copyright (c) 1999-2000 Cisco, Inc.
5  * Copyright (c) 1999-2001 Motorola, Inc.
6  * Copyright (c) 2002 Intel Corp.
7  *
8  * This file is part of the SCTP kernel implementation
9  *
10  * This header represents the structures and constants needed to support
11  * the SCTP Extension to the Sockets API.
12  *
13  * This SCTP implementation is free software;
14  * you can redistribute it and/or modify it under the terms of
15  * the GNU General Public License as published by
16  * the Free Software Foundation; either version 2, or (at your option)
17  * any later version.
18  *
19  * This SCTP implementation is distributed in the hope that it
20  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21  *                 ************************
22  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23  * See the GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with GNU CC; see the file COPYING.  If not, see
27  * <http://www.gnu.org/licenses/>.
28  *
29  * Please send any bug reports or fixes you make to the
30  * email address(es):
31  *    lksctp developers <linux-sctp@vger.kernel.org>
32  *
33  * Or submit a bug report through the following website:
34  *    http://www.sf.net/projects/lksctp
35  *
36  * Written or modified by:
37  *    La Monte H.P. Yarroll    <piggy@acm.org>
38  *    R. Stewart               <randall@sctp.chicago.il.us>
39  *    K. Morneau               <kmorneau@cisco.com>
40  *    Q. Xie                   <qxie1@email.mot.com>
41  *    Karl Knutson             <karl@athena.chicago.il.us>
42  *    Jon Grimm                <jgrimm@us.ibm.com>
43  *    Daisy Chang              <daisyc@us.ibm.com>
44  *    Ryan Layer               <rmlayer@us.ibm.com>
45  *    Ardelle Fan              <ardelle.fan@intel.com>
46  *    Sridhar Samudrala        <sri@us.ibm.com>
47  *    Inaky Perez-Gonzalez     <inaky.gonzalez@intel.com>
48  *    Vlad Yasevich            <vladislav.yasevich@hp.com>
49  *
50  * Any bugs reported given to us we will try to fix... any fixes shared will
51  * be incorporated into the next SCTP release.
52  */
53 
54 #ifndef _UAPI_SCTP_H
55 #define _UAPI_SCTP_H
56 
57 #include <linux/types.h>
58 #include <linux/socket.h>
59 
60 typedef __s32 sctp_assoc_t;
61 
62 /* The following symbols come from the Sockets API Extensions for
63  * SCTP <draft-ietf-tsvwg-sctpsocket-07.txt>.
64  */
65 #define SCTP_RTOINFO	0
66 #define SCTP_ASSOCINFO  1
67 #define SCTP_INITMSG	2
68 #define SCTP_NODELAY	3		/* Get/set nodelay option. */
69 #define SCTP_AUTOCLOSE	4
70 #define SCTP_SET_PEER_PRIMARY_ADDR 5
71 #define SCTP_PRIMARY_ADDR	6
72 #define SCTP_ADAPTATION_LAYER	7
73 #define SCTP_DISABLE_FRAGMENTS	8
74 #define SCTP_PEER_ADDR_PARAMS	9
75 #define SCTP_DEFAULT_SEND_PARAM	10
76 #define SCTP_EVENTS	11
77 #define SCTP_I_WANT_MAPPED_V4_ADDR 12	/* Turn on/off mapped v4 addresses  */
78 #define SCTP_MAXSEG	13		/* Get/set maximum fragment. */
79 #define SCTP_STATUS	14
80 #define SCTP_GET_PEER_ADDR_INFO	15
81 #define SCTP_DELAYED_ACK_TIME	16
82 #define SCTP_DELAYED_ACK SCTP_DELAYED_ACK_TIME
83 #define SCTP_DELAYED_SACK SCTP_DELAYED_ACK_TIME
84 #define SCTP_CONTEXT	17
85 #define SCTP_FRAGMENT_INTERLEAVE	18
86 #define SCTP_PARTIAL_DELIVERY_POINT	19 /* Set/Get partial delivery point */
87 #define SCTP_MAX_BURST	20		/* Set/Get max burst */
88 #define SCTP_AUTH_CHUNK	21	/* Set only: add a chunk type to authenticate */
89 #define SCTP_HMAC_IDENT	22
90 #define SCTP_AUTH_KEY	23
91 #define SCTP_AUTH_ACTIVE_KEY	24
92 #define SCTP_AUTH_DELETE_KEY	25
93 #define SCTP_PEER_AUTH_CHUNKS	26	/* Read only */
94 #define SCTP_LOCAL_AUTH_CHUNKS	27	/* Read only */
95 #define SCTP_GET_ASSOC_NUMBER	28	/* Read only */
96 #define SCTP_GET_ASSOC_ID_LIST	29	/* Read only */
97 #define SCTP_AUTO_ASCONF       30
98 #define SCTP_PEER_ADDR_THLDS	31
99 #define SCTP_RECVRCVINFO	32
100 #define SCTP_RECVNXTINFO	33
101 #define SCTP_DEFAULT_SNDINFO	34
102 #define SCTP_AUTH_DEACTIVATE_KEY	35
103 #define SCTP_REUSE_PORT		36
104 
105 /* Internal Socket Options. Some of the sctp library functions are
106  * implemented using these socket options.
107  */
108 #define SCTP_SOCKOPT_BINDX_ADD	100	/* BINDX requests for adding addrs */
109 #define SCTP_SOCKOPT_BINDX_REM	101	/* BINDX requests for removing addrs. */
110 #define SCTP_SOCKOPT_PEELOFF	102	/* peel off association. */
111 /* Options 104-106 are deprecated and removed. Do not use this space */
112 #define SCTP_SOCKOPT_CONNECTX_OLD	107	/* CONNECTX old requests. */
113 #define SCTP_GET_PEER_ADDRS	108		/* Get all peer address. */
114 #define SCTP_GET_LOCAL_ADDRS	109		/* Get all local address. */
115 #define SCTP_SOCKOPT_CONNECTX	110		/* CONNECTX requests. */
116 #define SCTP_SOCKOPT_CONNECTX3	111	/* CONNECTX requests (updated) */
117 #define SCTP_GET_ASSOC_STATS	112	/* Read only */
118 #define SCTP_PR_SUPPORTED	113
119 #define SCTP_DEFAULT_PRINFO	114
120 #define SCTP_PR_ASSOC_STATUS	115
121 #define SCTP_PR_STREAM_STATUS	116
122 #define SCTP_RECONFIG_SUPPORTED	117
123 #define SCTP_ENABLE_STREAM_RESET	118
124 #define SCTP_RESET_STREAMS	119
125 #define SCTP_RESET_ASSOC	120
126 #define SCTP_ADD_STREAMS	121
127 #define SCTP_SOCKOPT_PEELOFF_FLAGS 122
128 #define SCTP_STREAM_SCHEDULER	123
129 #define SCTP_STREAM_SCHEDULER_VALUE	124
130 #define SCTP_INTERLEAVING_SUPPORTED	125
131 #define SCTP_SENDMSG_CONNECT	126
132 
133 /* PR-SCTP policies */
134 #define SCTP_PR_SCTP_NONE	0x0000
135 #define SCTP_PR_SCTP_TTL	0x0010
136 #define SCTP_PR_SCTP_RTX	0x0020
137 #define SCTP_PR_SCTP_PRIO	0x0030
138 #define SCTP_PR_SCTP_MAX	SCTP_PR_SCTP_PRIO
139 #define SCTP_PR_SCTP_MASK	0x0030
140 
141 #define __SCTP_PR_INDEX(x)	((x >> 4) - 1)
142 #define SCTP_PR_INDEX(x)	__SCTP_PR_INDEX(SCTP_PR_SCTP_ ## x)
143 
144 #define SCTP_PR_POLICY(x)	((x) & SCTP_PR_SCTP_MASK)
145 #define SCTP_PR_SET_POLICY(flags, x)	\
146 	do {				\
147 		flags &= ~SCTP_PR_SCTP_MASK;	\
148 		flags |= x;		\
149 	} while (0)
150 
151 #define SCTP_PR_TTL_ENABLED(x)	(SCTP_PR_POLICY(x) == SCTP_PR_SCTP_TTL)
152 #define SCTP_PR_RTX_ENABLED(x)	(SCTP_PR_POLICY(x) == SCTP_PR_SCTP_RTX)
153 #define SCTP_PR_PRIO_ENABLED(x)	(SCTP_PR_POLICY(x) == SCTP_PR_SCTP_PRIO)
154 
155 /* For enable stream reset */
156 #define SCTP_ENABLE_RESET_STREAM_REQ	0x01
157 #define SCTP_ENABLE_RESET_ASSOC_REQ	0x02
158 #define SCTP_ENABLE_CHANGE_ASSOC_REQ	0x04
159 #define SCTP_ENABLE_STRRESET_MASK	0x07
160 
161 #define SCTP_STREAM_RESET_INCOMING	0x01
162 #define SCTP_STREAM_RESET_OUTGOING	0x02
163 
164 /* These are bit fields for msghdr->msg_flags.  See section 5.1.  */
165 /* On user space Linux, these live in <bits/socket.h> as an enum.  */
166 enum sctp_msg_flags {
167 	MSG_NOTIFICATION = 0x8000,
168 #define MSG_NOTIFICATION MSG_NOTIFICATION
169 };
170 
171 /* 5.3.1 SCTP Initiation Structure (SCTP_INIT)
172  *
173  *   This cmsghdr structure provides information for initializing new
174  *   SCTP associations with sendmsg().  The SCTP_INITMSG socket option
175  *   uses this same data structure.  This structure is not used for
176  *   recvmsg().
177  *
178  *   cmsg_level    cmsg_type      cmsg_data[]
179  *   ------------  ------------   ----------------------
180  *   IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
181  */
182 struct sctp_initmsg {
183 	__u16 sinit_num_ostreams;
184 	__u16 sinit_max_instreams;
185 	__u16 sinit_max_attempts;
186 	__u16 sinit_max_init_timeo;
187 };
188 
189 /* 5.3.2 SCTP Header Information Structure (SCTP_SNDRCV)
190  *
191  *   This cmsghdr structure specifies SCTP options for sendmsg() and
192  *   describes SCTP header information about a received message through
193  *   recvmsg().
194  *
195  *   cmsg_level    cmsg_type      cmsg_data[]
196  *   ------------  ------------   ----------------------
197  *   IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
198  */
199 struct sctp_sndrcvinfo {
200 	__u16 sinfo_stream;
201 	__u16 sinfo_ssn;
202 	__u16 sinfo_flags;
203 	__u32 sinfo_ppid;
204 	__u32 sinfo_context;
205 	__u32 sinfo_timetolive;
206 	__u32 sinfo_tsn;
207 	__u32 sinfo_cumtsn;
208 	sctp_assoc_t sinfo_assoc_id;
209 };
210 
211 /* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
212  *
213  *   This cmsghdr structure specifies SCTP options for sendmsg().
214  *
215  *   cmsg_level    cmsg_type      cmsg_data[]
216  *   ------------  ------------   -------------------
217  *   IPPROTO_SCTP  SCTP_SNDINFO   struct sctp_sndinfo
218  */
219 struct sctp_sndinfo {
220 	__u16 snd_sid;
221 	__u16 snd_flags;
222 	__u32 snd_ppid;
223 	__u32 snd_context;
224 	sctp_assoc_t snd_assoc_id;
225 };
226 
227 /* 5.3.5 SCTP Receive Information Structure (SCTP_RCVINFO)
228  *
229  *   This cmsghdr structure describes SCTP receive information
230  *   about a received message through recvmsg().
231  *
232  *   cmsg_level    cmsg_type      cmsg_data[]
233  *   ------------  ------------   -------------------
234  *   IPPROTO_SCTP  SCTP_RCVINFO   struct sctp_rcvinfo
235  */
236 struct sctp_rcvinfo {
237 	__u16 rcv_sid;
238 	__u16 rcv_ssn;
239 	__u16 rcv_flags;
240 	__u32 rcv_ppid;
241 	__u32 rcv_tsn;
242 	__u32 rcv_cumtsn;
243 	__u32 rcv_context;
244 	sctp_assoc_t rcv_assoc_id;
245 };
246 
247 /* 5.3.6 SCTP Next Receive Information Structure (SCTP_NXTINFO)
248  *
249  *   This cmsghdr structure describes SCTP receive information
250  *   of the next message that will be delivered through recvmsg()
251  *   if this information is already available when delivering
252  *   the current message.
253  *
254  *   cmsg_level    cmsg_type      cmsg_data[]
255  *   ------------  ------------   -------------------
256  *   IPPROTO_SCTP  SCTP_NXTINFO   struct sctp_nxtinfo
257  */
258 struct sctp_nxtinfo {
259 	__u16 nxt_sid;
260 	__u16 nxt_flags;
261 	__u32 nxt_ppid;
262 	__u32 nxt_length;
263 	sctp_assoc_t nxt_assoc_id;
264 };
265 
266 /* 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
267  *
268  *   This cmsghdr structure specifies SCTP options for sendmsg().
269  *
270  *   cmsg_level    cmsg_type      cmsg_data[]
271  *   ------------  ------------   -------------------
272  *   IPPROTO_SCTP  SCTP_PRINFO    struct sctp_prinfo
273  */
274 struct sctp_prinfo {
275 	__u16 pr_policy;
276 	__u32 pr_value;
277 };
278 
279 /* 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
280  *
281  *   This cmsghdr structure specifies SCTP options for sendmsg().
282  *
283  *   cmsg_level    cmsg_type      cmsg_data[]
284  *   ------------  ------------   -------------------
285  *   IPPROTO_SCTP  SCTP_AUTHINFO  struct sctp_authinfo
286  */
287 struct sctp_authinfo {
288 	__u16 auth_keynumber;
289 };
290 
291 /*
292  *  sinfo_flags: 16 bits (unsigned integer)
293  *
294  *   This field may contain any of the following flags and is composed of
295  *   a bitwise OR of these values.
296  */
297 enum sctp_sinfo_flags {
298 	SCTP_UNORDERED		= (1 << 0), /* Send/receive message unordered. */
299 	SCTP_ADDR_OVER		= (1 << 1), /* Override the primary destination. */
300 	SCTP_ABORT		= (1 << 2), /* Send an ABORT message to the peer. */
301 	SCTP_SACK_IMMEDIATELY	= (1 << 3), /* SACK should be sent without delay. */
302 	/* 2 bits here have been used by SCTP_PR_SCTP_MASK */
303 	SCTP_SENDALL		= (1 << 6),
304 	SCTP_PR_SCTP_ALL	= (1 << 7),
305 	SCTP_NOTIFICATION	= MSG_NOTIFICATION, /* Next message is not user msg but notification. */
306 	SCTP_EOF		= MSG_FIN,  /* Initiate graceful shutdown process. */
307 };
308 
309 typedef union {
310 	__u8   			raw;
311 	struct sctp_initmsg	init;
312 	struct sctp_sndrcvinfo	sndrcv;
313 } sctp_cmsg_data_t;
314 
315 /* These are cmsg_types.  */
316 typedef enum sctp_cmsg_type {
317 	SCTP_INIT,		/* 5.2.1 SCTP Initiation Structure */
318 #define SCTP_INIT	SCTP_INIT
319 	SCTP_SNDRCV,		/* 5.2.2 SCTP Header Information Structure */
320 #define SCTP_SNDRCV	SCTP_SNDRCV
321 	SCTP_SNDINFO,		/* 5.3.4 SCTP Send Information Structure */
322 #define SCTP_SNDINFO	SCTP_SNDINFO
323 	SCTP_RCVINFO,		/* 5.3.5 SCTP Receive Information Structure */
324 #define SCTP_RCVINFO	SCTP_RCVINFO
325 	SCTP_NXTINFO,		/* 5.3.6 SCTP Next Receive Information Structure */
326 #define SCTP_NXTINFO	SCTP_NXTINFO
327 	SCTP_PRINFO,		/* 5.3.7 SCTP PR-SCTP Information Structure */
328 #define SCTP_PRINFO	SCTP_PRINFO
329 	SCTP_AUTHINFO,		/* 5.3.8 SCTP AUTH Information Structure */
330 #define SCTP_AUTHINFO	SCTP_AUTHINFO
331 	SCTP_DSTADDRV4,		/* 5.3.9 SCTP Destination IPv4 Address Structure */
332 #define SCTP_DSTADDRV4	SCTP_DSTADDRV4
333 	SCTP_DSTADDRV6,		/* 5.3.10 SCTP Destination IPv6 Address Structure */
334 #define SCTP_DSTADDRV6	SCTP_DSTADDRV6
335 } sctp_cmsg_t;
336 
337 /*
338  * 5.3.1.1 SCTP_ASSOC_CHANGE
339  *
340  *   Communication notifications inform the ULP that an SCTP association
341  *   has either begun or ended. The identifier for a new association is
342  *   provided by this notificaion. The notification information has the
343  *   following format:
344  *
345  */
346 struct sctp_assoc_change {
347 	__u16 sac_type;
348 	__u16 sac_flags;
349 	__u32 sac_length;
350 	__u16 sac_state;
351 	__u16 sac_error;
352 	__u16 sac_outbound_streams;
353 	__u16 sac_inbound_streams;
354 	sctp_assoc_t sac_assoc_id;
355 	__u8 sac_info[0];
356 };
357 
358 /*
359  *   sac_state: 32 bits (signed integer)
360  *
361  *   This field holds one of a number of values that communicate the
362  *   event that happened to the association.  They include:
363  *
364  *   Note:  The following state names deviate from the API draft as
365  *   the names clash too easily with other kernel symbols.
366  */
367 enum sctp_sac_state {
368 	SCTP_COMM_UP,
369 	SCTP_COMM_LOST,
370 	SCTP_RESTART,
371 	SCTP_SHUTDOWN_COMP,
372 	SCTP_CANT_STR_ASSOC,
373 };
374 
375 /*
376  * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
377  *
378  *   When a destination address on a multi-homed peer encounters a change
379  *   an interface details event is sent.  The information has the
380  *   following structure:
381  */
382 struct sctp_paddr_change {
383 	__u16 spc_type;
384 	__u16 spc_flags;
385 	__u32 spc_length;
386 	struct sockaddr_storage spc_aaddr;
387 	int spc_state;
388 	int spc_error;
389 	sctp_assoc_t spc_assoc_id;
390 } __attribute__((packed, aligned(4)));
391 
392 /*
393  *    spc_state:  32 bits (signed integer)
394  *
395  *   This field holds one of a number of values that communicate the
396  *   event that happened to the address.  They include:
397  */
398 enum sctp_spc_state {
399 	SCTP_ADDR_AVAILABLE,
400 	SCTP_ADDR_UNREACHABLE,
401 	SCTP_ADDR_REMOVED,
402 	SCTP_ADDR_ADDED,
403 	SCTP_ADDR_MADE_PRIM,
404 	SCTP_ADDR_CONFIRMED,
405 };
406 
407 
408 /*
409  * 5.3.1.3 SCTP_REMOTE_ERROR
410  *
411  *   A remote peer may send an Operational Error message to its peer.
412  *   This message indicates a variety of error conditions on an
413  *   association. The entire error TLV as it appears on the wire is
414  *   included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
415  *   specification [SCTP] and any extensions for a list of possible
416  *   error formats. SCTP error TLVs have the format:
417  */
418 struct sctp_remote_error {
419 	__u16 sre_type;
420 	__u16 sre_flags;
421 	__u32 sre_length;
422 	__be16 sre_error;
423 	sctp_assoc_t sre_assoc_id;
424 	__u8 sre_data[0];
425 };
426 
427 
428 /*
429  * 5.3.1.4 SCTP_SEND_FAILED
430  *
431  *   If SCTP cannot deliver a message it may return the message as a
432  *   notification.
433  */
434 struct sctp_send_failed {
435 	__u16 ssf_type;
436 	__u16 ssf_flags;
437 	__u32 ssf_length;
438 	__u32 ssf_error;
439 	struct sctp_sndrcvinfo ssf_info;
440 	sctp_assoc_t ssf_assoc_id;
441 	__u8 ssf_data[0];
442 };
443 
444 /*
445  *   ssf_flags: 16 bits (unsigned integer)
446  *
447  *   The flag value will take one of the following values
448  *
449  *   SCTP_DATA_UNSENT  - Indicates that the data was never put on
450  *                       the wire.
451  *
452  *   SCTP_DATA_SENT    - Indicates that the data was put on the wire.
453  *                       Note that this does not necessarily mean that the
454  *                       data was (or was not) successfully delivered.
455  */
456 enum sctp_ssf_flags {
457 	SCTP_DATA_UNSENT,
458 	SCTP_DATA_SENT,
459 };
460 
461 /*
462  * 5.3.1.5 SCTP_SHUTDOWN_EVENT
463  *
464  *   When a peer sends a SHUTDOWN, SCTP delivers this notification to
465  *   inform the application that it should cease sending data.
466  */
467 struct sctp_shutdown_event {
468 	__u16 sse_type;
469 	__u16 sse_flags;
470 	__u32 sse_length;
471 	sctp_assoc_t sse_assoc_id;
472 };
473 
474 /*
475  * 5.3.1.6 SCTP_ADAPTATION_INDICATION
476  *
477  *   When a peer sends a Adaptation Layer Indication parameter , SCTP
478  *   delivers this notification to inform the application
479  *   that of the peers requested adaptation layer.
480  */
481 struct sctp_adaptation_event {
482 	__u16 sai_type;
483 	__u16 sai_flags;
484 	__u32 sai_length;
485 	__u32 sai_adaptation_ind;
486 	sctp_assoc_t sai_assoc_id;
487 };
488 
489 /*
490  * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
491  *
492  *   When a receiver is engaged in a partial delivery of a
493  *   message this notification will be used to indicate
494  *   various events.
495  */
496 struct sctp_pdapi_event {
497 	__u16 pdapi_type;
498 	__u16 pdapi_flags;
499 	__u32 pdapi_length;
500 	__u32 pdapi_indication;
501 	sctp_assoc_t pdapi_assoc_id;
502 	__u32 pdapi_stream;
503 	__u32 pdapi_seq;
504 };
505 
506 enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };
507 
508 /*
509  * 5.3.1.8.  SCTP_AUTHENTICATION_EVENT
510  *
511  *  When a receiver is using authentication this message will provide
512  *  notifications regarding new keys being made active as well as errors.
513  */
514 struct sctp_authkey_event {
515 	__u16 auth_type;
516 	__u16 auth_flags;
517 	__u32 auth_length;
518 	__u16 auth_keynumber;
519 	__u16 auth_altkeynumber;
520 	__u32 auth_indication;
521 	sctp_assoc_t auth_assoc_id;
522 };
523 
524 enum {
525 	SCTP_AUTH_NEW_KEY,
526 #define	SCTP_AUTH_NEWKEY	SCTP_AUTH_NEW_KEY /* compatible with before */
527 	SCTP_AUTH_FREE_KEY,
528 	SCTP_AUTH_NO_AUTH,
529 };
530 
531 /*
532  * 6.1.9. SCTP_SENDER_DRY_EVENT
533  *
534  * When the SCTP stack has no more user data to send or retransmit, this
535  * notification is given to the user. Also, at the time when a user app
536  * subscribes to this event, if there is no data to be sent or
537  * retransmit, the stack will immediately send up this notification.
538  */
539 struct sctp_sender_dry_event {
540 	__u16 sender_dry_type;
541 	__u16 sender_dry_flags;
542 	__u32 sender_dry_length;
543 	sctp_assoc_t sender_dry_assoc_id;
544 };
545 
546 #define SCTP_STREAM_RESET_INCOMING_SSN	0x0001
547 #define SCTP_STREAM_RESET_OUTGOING_SSN	0x0002
548 #define SCTP_STREAM_RESET_DENIED	0x0004
549 #define SCTP_STREAM_RESET_FAILED	0x0008
550 struct sctp_stream_reset_event {
551 	__u16 strreset_type;
552 	__u16 strreset_flags;
553 	__u32 strreset_length;
554 	sctp_assoc_t strreset_assoc_id;
555 	__u16 strreset_stream_list[];
556 };
557 
558 #define SCTP_ASSOC_RESET_DENIED		0x0004
559 #define SCTP_ASSOC_RESET_FAILED		0x0008
560 struct sctp_assoc_reset_event {
561 	__u16 assocreset_type;
562 	__u16 assocreset_flags;
563 	__u32 assocreset_length;
564 	sctp_assoc_t assocreset_assoc_id;
565 	__u32 assocreset_local_tsn;
566 	__u32 assocreset_remote_tsn;
567 };
568 
569 #define SCTP_ASSOC_CHANGE_DENIED	0x0004
570 #define SCTP_ASSOC_CHANGE_FAILED	0x0008
571 #define SCTP_STREAM_CHANGE_DENIED	SCTP_ASSOC_CHANGE_DENIED
572 #define SCTP_STREAM_CHANGE_FAILED	SCTP_ASSOC_CHANGE_FAILED
573 struct sctp_stream_change_event {
574 	__u16 strchange_type;
575 	__u16 strchange_flags;
576 	__u32 strchange_length;
577 	sctp_assoc_t strchange_assoc_id;
578 	__u16 strchange_instrms;
579 	__u16 strchange_outstrms;
580 };
581 
582 /*
583  * Described in Section 7.3
584  *   Ancillary Data and Notification Interest Options
585  */
586 struct sctp_event_subscribe {
587 	__u8 sctp_data_io_event;
588 	__u8 sctp_association_event;
589 	__u8 sctp_address_event;
590 	__u8 sctp_send_failure_event;
591 	__u8 sctp_peer_error_event;
592 	__u8 sctp_shutdown_event;
593 	__u8 sctp_partial_delivery_event;
594 	__u8 sctp_adaptation_layer_event;
595 	__u8 sctp_authentication_event;
596 	__u8 sctp_sender_dry_event;
597 	__u8 sctp_stream_reset_event;
598 	__u8 sctp_assoc_reset_event;
599 	__u8 sctp_stream_change_event;
600 };
601 
602 /*
603  * 5.3.1 SCTP Notification Structure
604  *
605  *   The notification structure is defined as the union of all
606  *   notification types.
607  *
608  */
609 union sctp_notification {
610 	struct {
611 		__u16 sn_type;             /* Notification type. */
612 		__u16 sn_flags;
613 		__u32 sn_length;
614 	} sn_header;
615 	struct sctp_assoc_change sn_assoc_change;
616 	struct sctp_paddr_change sn_paddr_change;
617 	struct sctp_remote_error sn_remote_error;
618 	struct sctp_send_failed sn_send_failed;
619 	struct sctp_shutdown_event sn_shutdown_event;
620 	struct sctp_adaptation_event sn_adaptation_event;
621 	struct sctp_pdapi_event sn_pdapi_event;
622 	struct sctp_authkey_event sn_authkey_event;
623 	struct sctp_sender_dry_event sn_sender_dry_event;
624 	struct sctp_stream_reset_event sn_strreset_event;
625 	struct sctp_assoc_reset_event sn_assocreset_event;
626 	struct sctp_stream_change_event sn_strchange_event;
627 };
628 
629 /* Section 5.3.1
630  * All standard values for sn_type flags are greater than 2^15.
631  * Values from 2^15 and down are reserved.
632  */
633 
634 enum sctp_sn_type {
635 	SCTP_SN_TYPE_BASE     = (1<<15),
636 	SCTP_ASSOC_CHANGE,
637 #define SCTP_ASSOC_CHANGE		SCTP_ASSOC_CHANGE
638 	SCTP_PEER_ADDR_CHANGE,
639 #define SCTP_PEER_ADDR_CHANGE		SCTP_PEER_ADDR_CHANGE
640 	SCTP_SEND_FAILED,
641 #define SCTP_SEND_FAILED		SCTP_SEND_FAILED
642 	SCTP_REMOTE_ERROR,
643 #define SCTP_REMOTE_ERROR		SCTP_REMOTE_ERROR
644 	SCTP_SHUTDOWN_EVENT,
645 #define SCTP_SHUTDOWN_EVENT		SCTP_SHUTDOWN_EVENT
646 	SCTP_PARTIAL_DELIVERY_EVENT,
647 #define SCTP_PARTIAL_DELIVERY_EVENT	SCTP_PARTIAL_DELIVERY_EVENT
648 	SCTP_ADAPTATION_INDICATION,
649 #define SCTP_ADAPTATION_INDICATION	SCTP_ADAPTATION_INDICATION
650 	SCTP_AUTHENTICATION_EVENT,
651 #define SCTP_AUTHENTICATION_INDICATION	SCTP_AUTHENTICATION_EVENT
652 	SCTP_SENDER_DRY_EVENT,
653 #define SCTP_SENDER_DRY_EVENT		SCTP_SENDER_DRY_EVENT
654 	SCTP_STREAM_RESET_EVENT,
655 #define SCTP_STREAM_RESET_EVENT		SCTP_STREAM_RESET_EVENT
656 	SCTP_ASSOC_RESET_EVENT,
657 #define SCTP_ASSOC_RESET_EVENT		SCTP_ASSOC_RESET_EVENT
658 	SCTP_STREAM_CHANGE_EVENT,
659 #define SCTP_STREAM_CHANGE_EVENT	SCTP_STREAM_CHANGE_EVENT
660 };
661 
662 /* Notification error codes used to fill up the error fields in some
663  * notifications.
664  * SCTP_PEER_ADDRESS_CHAGE 	: spc_error
665  * SCTP_ASSOC_CHANGE		: sac_error
666  * These names should be potentially included in the draft 04 of the SCTP
667  * sockets API specification.
668  */
669 typedef enum sctp_sn_error {
670 	SCTP_FAILED_THRESHOLD,
671 	SCTP_RECEIVED_SACK,
672 	SCTP_HEARTBEAT_SUCCESS,
673 	SCTP_RESPONSE_TO_USER_REQ,
674 	SCTP_INTERNAL_ERROR,
675 	SCTP_SHUTDOWN_GUARD_EXPIRES,
676 	SCTP_PEER_FAULTY,
677 } sctp_sn_error_t;
678 
679 /*
680  * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)
681  *
682  *   The protocol parameters used to initialize and bound retransmission
683  *   timeout (RTO) are tunable.  See [SCTP] for more information on how
684  *   these parameters are used in RTO calculation.
685  */
686 struct sctp_rtoinfo {
687 	sctp_assoc_t	srto_assoc_id;
688 	__u32		srto_initial;
689 	__u32		srto_max;
690 	__u32		srto_min;
691 };
692 
693 /*
694  * 7.1.2 Association Parameters (SCTP_ASSOCINFO)
695  *
696  *   This option is used to both examine and set various association and
697  *   endpoint parameters.
698  */
699 struct sctp_assocparams {
700 	sctp_assoc_t	sasoc_assoc_id;
701 	__u16		sasoc_asocmaxrxt;
702 	__u16		sasoc_number_peer_destinations;
703 	__u32		sasoc_peer_rwnd;
704 	__u32		sasoc_local_rwnd;
705 	__u32		sasoc_cookie_life;
706 };
707 
708 /*
709  * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
710  *
711  *  Requests that the peer mark the enclosed address as the association
712  *  primary. The enclosed address must be one of the association's
713  *  locally bound addresses. The following structure is used to make a
714  *   set primary request:
715  */
716 struct sctp_setpeerprim {
717 	sctp_assoc_t            sspp_assoc_id;
718 	struct sockaddr_storage sspp_addr;
719 } __attribute__((packed, aligned(4)));
720 
721 /*
722  * 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
723  *
724  *  Requests that the local SCTP stack use the enclosed peer address as
725  *  the association primary. The enclosed address must be one of the
726  *  association peer's addresses. The following structure is used to
727  *  make a set peer primary request:
728  */
729 struct sctp_prim {
730 	sctp_assoc_t            ssp_assoc_id;
731 	struct sockaddr_storage ssp_addr;
732 } __attribute__((packed, aligned(4)));
733 
734 /* For backward compatibility use, define the old name too */
735 #define sctp_setprim	sctp_prim
736 
737 /*
738  * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
739  *
740  * Requests that the local endpoint set the specified Adaptation Layer
741  * Indication parameter for all future INIT and INIT-ACK exchanges.
742  */
743 struct sctp_setadaptation {
744 	__u32	ssb_adaptation_ind;
745 };
746 
747 /*
748  * 7.1.13 Peer Address Parameters  (SCTP_PEER_ADDR_PARAMS)
749  *
750  *   Applications can enable or disable heartbeats for any peer address
751  *   of an association, modify an address's heartbeat interval, force a
752  *   heartbeat to be sent immediately, and adjust the address's maximum
753  *   number of retransmissions sent before an address is considered
754  *   unreachable. The following structure is used to access and modify an
755  *   address's parameters:
756  */
757 enum  sctp_spp_flags {
758 	SPP_HB_ENABLE = 1<<0,		/*Enable heartbeats*/
759 	SPP_HB_DISABLE = 1<<1,		/*Disable heartbeats*/
760 	SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
761 	SPP_HB_DEMAND = 1<<2,		/*Send heartbeat immediately*/
762 	SPP_PMTUD_ENABLE = 1<<3,	/*Enable PMTU discovery*/
763 	SPP_PMTUD_DISABLE = 1<<4,	/*Disable PMTU discovery*/
764 	SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
765 	SPP_SACKDELAY_ENABLE = 1<<5,	/*Enable SACK*/
766 	SPP_SACKDELAY_DISABLE = 1<<6,	/*Disable SACK*/
767 	SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
768 	SPP_HB_TIME_IS_ZERO = 1<<7,	/* Set HB delay to 0 */
769 	SPP_IPV6_FLOWLABEL = 1<<8,
770 	SPP_DSCP = 1<<9,
771 };
772 
773 struct sctp_paddrparams {
774 	sctp_assoc_t		spp_assoc_id;
775 	struct sockaddr_storage	spp_address;
776 	__u32			spp_hbinterval;
777 	__u16			spp_pathmaxrxt;
778 	__u32			spp_pathmtu;
779 	__u32			spp_sackdelay;
780 	__u32			spp_flags;
781 	__u32			spp_ipv6_flowlabel;
782 	__u8			spp_dscp;
783 } __attribute__((packed, aligned(4)));
784 
785 /*
786  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
787  *
788  * This set option adds a chunk type that the user is requesting to be
789  * received only in an authenticated way.  Changes to the list of chunks
790  * will only effect future associations on the socket.
791  */
792 struct sctp_authchunk {
793 	__u8		sauth_chunk;
794 };
795 
796 /*
797  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
798  *
799  * This option gets or sets the list of HMAC algorithms that the local
800  * endpoint requires the peer to use.
801  */
802 #ifndef __KERNEL__
803 /* This here is only used by user space as is. It might not be a good idea
804  * to export/reveal the whole structure with reserved fields etc.
805  */
806 enum {
807 	SCTP_AUTH_HMAC_ID_SHA1 = 1,
808 	SCTP_AUTH_HMAC_ID_SHA256 = 3,
809 };
810 #endif
811 
812 struct sctp_hmacalgo {
813 	__u32		shmac_num_idents;
814 	__u16		shmac_idents[];
815 };
816 
817 /* Sadly, user and kernel space have different names for
818  * this structure member, so this is to not break anything.
819  */
820 #define shmac_number_of_idents	shmac_num_idents
821 
822 /*
823  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
824  *
825  * This option will set a shared secret key which is used to build an
826  * association shared key.
827  */
828 struct sctp_authkey {
829 	sctp_assoc_t	sca_assoc_id;
830 	__u16		sca_keynumber;
831 	__u16		sca_keylength;
832 	__u8		sca_key[];
833 };
834 
835 /*
836  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
837  *
838  * This option will get or set the active shared key to be used to build
839  * the association shared key.
840  */
841 
842 struct sctp_authkeyid {
843 	sctp_assoc_t	scact_assoc_id;
844 	__u16		scact_keynumber;
845 };
846 
847 
848 /*
849  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
850  *
851  * This option will effect the way delayed acks are performed.  This
852  * option allows you to get or set the delayed ack time, in
853  * milliseconds.  It also allows changing the delayed ack frequency.
854  * Changing the frequency to 1 disables the delayed sack algorithm.  If
855  * the assoc_id is 0, then this sets or gets the endpoints default
856  * values.  If the assoc_id field is non-zero, then the set or get
857  * effects the specified association for the one to many model (the
858  * assoc_id field is ignored by the one to one model).  Note that if
859  * sack_delay or sack_freq are 0 when setting this option, then the
860  * current values will remain unchanged.
861  */
862 struct sctp_sack_info {
863 	sctp_assoc_t	sack_assoc_id;
864 	uint32_t	sack_delay;
865 	uint32_t	sack_freq;
866 };
867 
868 struct sctp_assoc_value {
869     sctp_assoc_t            assoc_id;
870     uint32_t                assoc_value;
871 };
872 
873 struct sctp_stream_value {
874 	sctp_assoc_t assoc_id;
875 	uint16_t stream_id;
876 	uint16_t stream_value;
877 };
878 
879 /*
880  * 7.2.2 Peer Address Information
881  *
882  *   Applications can retrieve information about a specific peer address
883  *   of an association, including its reachability state, congestion
884  *   window, and retransmission timer values.  This information is
885  *   read-only. The following structure is used to access this
886  *   information:
887  */
888 struct sctp_paddrinfo {
889 	sctp_assoc_t		spinfo_assoc_id;
890 	struct sockaddr_storage	spinfo_address;
891 	__s32			spinfo_state;
892 	__u32			spinfo_cwnd;
893 	__u32			spinfo_srtt;
894 	__u32			spinfo_rto;
895 	__u32			spinfo_mtu;
896 } __attribute__((packed, aligned(4)));
897 
898 /* Peer addresses's state. */
899 /* UNKNOWN: Peer address passed by the upper layer in sendmsg or connect[x]
900  * calls.
901  * UNCONFIRMED: Peer address received in INIT/INIT-ACK address parameters.
902  *              Not yet confirmed by a heartbeat and not available for data
903  *		transfers.
904  * ACTIVE : Peer address confirmed, active and available for data transfers.
905  * INACTIVE: Peer address inactive and not available for data transfers.
906  */
907 enum sctp_spinfo_state {
908 	SCTP_INACTIVE,
909 	SCTP_PF,
910 	SCTP_ACTIVE,
911 	SCTP_UNCONFIRMED,
912 	SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
913 };
914 
915 /*
916  * 7.2.1 Association Status (SCTP_STATUS)
917  *
918  *   Applications can retrieve current status information about an
919  *   association, including association state, peer receiver window size,
920  *   number of unacked data chunks, and number of data chunks pending
921  *   receipt.  This information is read-only.  The following structure is
922  *   used to access this information:
923  */
924 struct sctp_status {
925 	sctp_assoc_t		sstat_assoc_id;
926 	__s32			sstat_state;
927 	__u32			sstat_rwnd;
928 	__u16			sstat_unackdata;
929 	__u16			sstat_penddata;
930 	__u16			sstat_instrms;
931 	__u16			sstat_outstrms;
932 	__u32			sstat_fragmentation_point;
933 	struct sctp_paddrinfo	sstat_primary;
934 };
935 
936 /*
937  * 7.2.3.  Get the list of chunks the peer requires to be authenticated
938  *         (SCTP_PEER_AUTH_CHUNKS)
939  *
940  * This option gets a list of chunks for a specified association that
941  * the peer requires to be received authenticated only.
942  */
943 struct sctp_authchunks {
944 	sctp_assoc_t	gauth_assoc_id;
945 	__u32		gauth_number_of_chunks;
946 	uint8_t		gauth_chunks[];
947 };
948 
949 /* The broken spelling has been released already in lksctp-tools header,
950  * so don't break anyone, now that it's fixed.
951  */
952 #define guth_number_of_chunks	gauth_number_of_chunks
953 
954 /* Association states.  */
955 enum sctp_sstat_state {
956 	SCTP_EMPTY                = 0,
957 	SCTP_CLOSED               = 1,
958 	SCTP_COOKIE_WAIT          = 2,
959 	SCTP_COOKIE_ECHOED        = 3,
960 	SCTP_ESTABLISHED          = 4,
961 	SCTP_SHUTDOWN_PENDING     = 5,
962 	SCTP_SHUTDOWN_SENT        = 6,
963 	SCTP_SHUTDOWN_RECEIVED    = 7,
964 	SCTP_SHUTDOWN_ACK_SENT    = 8,
965 };
966 
967 /*
968  * 8.2.6. Get the Current Identifiers of Associations
969  *        (SCTP_GET_ASSOC_ID_LIST)
970  *
971  * This option gets the current list of SCTP association identifiers of
972  * the SCTP associations handled by a one-to-many style socket.
973  */
974 struct sctp_assoc_ids {
975 	__u32		gaids_number_of_ids;
976 	sctp_assoc_t	gaids_assoc_id[];
977 };
978 
979 /*
980  * 8.3, 8.5 get all peer/local addresses in an association.
981  * This parameter struct is used by SCTP_GET_PEER_ADDRS and
982  * SCTP_GET_LOCAL_ADDRS socket options used internally to implement
983  * sctp_getpaddrs() and sctp_getladdrs() API.
984  */
985 struct sctp_getaddrs_old {
986 	sctp_assoc_t            assoc_id;
987 	int			addr_num;
988 #ifdef __KERNEL__
989 	struct sockaddr		__user *addrs;
990 #else
991 	struct sockaddr		*addrs;
992 #endif
993 };
994 
995 struct sctp_getaddrs {
996 	sctp_assoc_t		assoc_id; /*input*/
997 	__u32			addr_num; /*output*/
998 	__u8			addrs[0]; /*output, variable size*/
999 };
1000 
1001 /* A socket user request obtained via SCTP_GET_ASSOC_STATS that retrieves
1002  * association stats. All stats are counts except sas_maxrto and
1003  * sas_obs_rto_ipaddr. maxrto is the max observed rto + transport since
1004  * the last call. Will return 0 when RTO was not update since last call
1005  */
1006 struct sctp_assoc_stats {
1007 	sctp_assoc_t	sas_assoc_id;    /* Input */
1008 					 /* Transport of observed max RTO */
1009 	struct sockaddr_storage sas_obs_rto_ipaddr;
1010 	__u64		sas_maxrto;      /* Maximum Observed RTO for period */
1011 	__u64		sas_isacks;	 /* SACKs received */
1012 	__u64		sas_osacks;	 /* SACKs sent */
1013 	__u64		sas_opackets;	 /* Packets sent */
1014 	__u64		sas_ipackets;	 /* Packets received */
1015 	__u64		sas_rtxchunks;   /* Retransmitted Chunks */
1016 	__u64		sas_outofseqtsns;/* TSN received > next expected */
1017 	__u64		sas_idupchunks;  /* Dups received (ordered+unordered) */
1018 	__u64		sas_gapcnt;      /* Gap Acknowledgements Received */
1019 	__u64		sas_ouodchunks;  /* Unordered data chunks sent */
1020 	__u64		sas_iuodchunks;  /* Unordered data chunks received */
1021 	__u64		sas_oodchunks;	 /* Ordered data chunks sent */
1022 	__u64		sas_iodchunks;	 /* Ordered data chunks received */
1023 	__u64		sas_octrlchunks; /* Control chunks sent */
1024 	__u64		sas_ictrlchunks; /* Control chunks received */
1025 };
1026 
1027 /*
1028  * 8.1 sctp_bindx()
1029  *
1030  * The flags parameter is formed from the bitwise OR of zero or more of the
1031  * following currently defined flags:
1032  */
1033 #define SCTP_BINDX_ADD_ADDR 0x01
1034 #define SCTP_BINDX_REM_ADDR 0x02
1035 
1036 /* This is the structure that is passed as an argument(optval) to
1037  * getsockopt(SCTP_SOCKOPT_PEELOFF).
1038  */
1039 typedef struct {
1040 	sctp_assoc_t associd;
1041 	int sd;
1042 } sctp_peeloff_arg_t;
1043 
1044 typedef struct {
1045 	sctp_peeloff_arg_t p_arg;
1046 	unsigned flags;
1047 } sctp_peeloff_flags_arg_t;
1048 
1049 /*
1050  *  Peer Address Thresholds socket option
1051  */
1052 struct sctp_paddrthlds {
1053 	sctp_assoc_t spt_assoc_id;
1054 	struct sockaddr_storage spt_address;
1055 	__u16 spt_pathmaxrxt;
1056 	__u16 spt_pathpfthld;
1057 };
1058 
1059 /*
1060  * Socket Option for Getting the Association/Stream-Specific PR-SCTP Status
1061  */
1062 struct sctp_prstatus {
1063 	sctp_assoc_t sprstat_assoc_id;
1064 	__u16 sprstat_sid;
1065 	__u16 sprstat_policy;
1066 	__u64 sprstat_abandoned_unsent;
1067 	__u64 sprstat_abandoned_sent;
1068 };
1069 
1070 struct sctp_default_prinfo {
1071 	sctp_assoc_t pr_assoc_id;
1072 	__u32 pr_value;
1073 	__u16 pr_policy;
1074 };
1075 
1076 struct sctp_info {
1077 	__u32	sctpi_tag;
1078 	__u32	sctpi_state;
1079 	__u32	sctpi_rwnd;
1080 	__u16	sctpi_unackdata;
1081 	__u16	sctpi_penddata;
1082 	__u16	sctpi_instrms;
1083 	__u16	sctpi_outstrms;
1084 	__u32	sctpi_fragmentation_point;
1085 	__u32	sctpi_inqueue;
1086 	__u32	sctpi_outqueue;
1087 	__u32	sctpi_overall_error;
1088 	__u32	sctpi_max_burst;
1089 	__u32	sctpi_maxseg;
1090 	__u32	sctpi_peer_rwnd;
1091 	__u32	sctpi_peer_tag;
1092 	__u8	sctpi_peer_capable;
1093 	__u8	sctpi_peer_sack;
1094 	__u16	__reserved1;
1095 
1096 	/* assoc status info */
1097 	__u64	sctpi_isacks;
1098 	__u64	sctpi_osacks;
1099 	__u64	sctpi_opackets;
1100 	__u64	sctpi_ipackets;
1101 	__u64	sctpi_rtxchunks;
1102 	__u64	sctpi_outofseqtsns;
1103 	__u64	sctpi_idupchunks;
1104 	__u64	sctpi_gapcnt;
1105 	__u64	sctpi_ouodchunks;
1106 	__u64	sctpi_iuodchunks;
1107 	__u64	sctpi_oodchunks;
1108 	__u64	sctpi_iodchunks;
1109 	__u64	sctpi_octrlchunks;
1110 	__u64	sctpi_ictrlchunks;
1111 
1112 	/* primary transport info */
1113 	struct sockaddr_storage	sctpi_p_address;
1114 	__s32	sctpi_p_state;
1115 	__u32	sctpi_p_cwnd;
1116 	__u32	sctpi_p_srtt;
1117 	__u32	sctpi_p_rto;
1118 	__u32	sctpi_p_hbinterval;
1119 	__u32	sctpi_p_pathmaxrxt;
1120 	__u32	sctpi_p_sackdelay;
1121 	__u32	sctpi_p_sackfreq;
1122 	__u32	sctpi_p_ssthresh;
1123 	__u32	sctpi_p_partial_bytes_acked;
1124 	__u32	sctpi_p_flight_size;
1125 	__u16	sctpi_p_error;
1126 	__u16	__reserved2;
1127 
1128 	/* sctp sock info */
1129 	__u32	sctpi_s_autoclose;
1130 	__u32	sctpi_s_adaptation_ind;
1131 	__u32	sctpi_s_pd_point;
1132 	__u8	sctpi_s_nodelay;
1133 	__u8	sctpi_s_disable_fragments;
1134 	__u8	sctpi_s_v4mapped;
1135 	__u8	sctpi_s_frag_interleave;
1136 	__u32	sctpi_s_type;
1137 	__u32	__reserved3;
1138 };
1139 
1140 struct sctp_reset_streams {
1141 	sctp_assoc_t srs_assoc_id;
1142 	uint16_t srs_flags;
1143 	uint16_t srs_number_streams;	/* 0 == ALL */
1144 	uint16_t srs_stream_list[];	/* list if srs_num_streams is not 0 */
1145 };
1146 
1147 struct sctp_add_streams {
1148 	sctp_assoc_t sas_assoc_id;
1149 	uint16_t sas_instrms;
1150 	uint16_t sas_outstrms;
1151 };
1152 
1153 /* SCTP Stream schedulers */
1154 enum sctp_sched_type {
1155 	SCTP_SS_FCFS,
1156 	SCTP_SS_DEFAULT = SCTP_SS_FCFS,
1157 	SCTP_SS_PRIO,
1158 	SCTP_SS_RR,
1159 	SCTP_SS_MAX = SCTP_SS_RR
1160 };
1161 
1162 #endif /* _UAPI_SCTP_H */
1163