1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #ifndef	_INET_SCTP_SCTP_IMPL_H
28 #define	_INET_SCTP_SCTP_IMPL_H
29 
30 #include <sys/inttypes.h>
31 #include <sys/taskq.h>
32 #include <sys/list.h>
33 #include <sys/strsun.h>
34 #include <sys/zone.h>
35 #include <netinet/ip6.h>
36 #include <inet/optcom.h>
37 #include <netinet/sctp.h>
38 #include <inet/sctp_itf.h>
39 #include "sctp_stack.h"
40 
41 #ifdef	__cplusplus
42 extern "C" {
43 #endif
44 
45 /* Streams device identifying info and version */
46 #define	SCTP_DEV_IDINFO	"SCTP Streams device 1.0"
47 
48 #define	SSN_GT(a, b)	((int16_t)((a)-(b)) > 0)
49 #define	SSN_GE(a, b)	((int16_t)((a)-(b)) >= 0)
50 
51 /* Default buffer size and flow control wake up threshold. */
52 #define	SCTP_XMIT_LOWATER	8192
53 #define	SCTP_XMIT_HIWATER	102400
54 #define	SCTP_RECV_LOWATER	8192
55 #define	SCTP_RECV_HIWATER	102400
56 
57 /* SCTP Timer control structure */
58 typedef struct sctpt_s {
59 	pfv_t	sctpt_pfv;	/* The routine we are to call */
60 	struct sctp_s *sctpt_sctp;	/* The parameter we are to pass in */
61 	struct sctp_faddr_s *sctpt_faddr;
62 } sctpt_t;
63 
64 /*
65  * Maximum number of duplicate TSNs we can report. This is currently
66  * static, and governs the size of the mblk used to hold the duplicate
67  * reports. The use of duplcate TSN reports is currently experimental,
68  * so for now a static limit should suffice.
69  */
70 #define	SCTP_DUP_MBLK_SZ	64
71 
72 #define	SCTP_IS_ADDR_UNSPEC(isv4, addr)		\
73 	((isv4) ? IN6_IS_ADDR_V4MAPPED_ANY(&(addr)) :	\
74 	IN6_IS_ADDR_UNSPECIFIED(&(addr)))
75 
76 /*
77  * SCTP parameters
78  */
79 /* Named Dispatch Parameter Management Structure */
80 typedef struct sctpparam_s {
81 	uint32_t	sctp_param_min;
82 	uint32_t	sctp_param_max;
83 	uint32_t	sctp_param_val;
84 	char		*sctp_param_name;
85 } sctpparam_t;
86 
87 #define	sctps_max_init_retr		sctps_params[0].sctp_param_val
88 #define	sctps_max_init_retr_high	sctps_params[0].sctp_param_max
89 #define	sctps_max_init_retr_low		sctps_params[0].sctp_param_min
90 #define	sctps_pa_max_retr		sctps_params[1].sctp_param_val
91 #define	sctps_pa_max_retr_high		sctps_params[1].sctp_param_max
92 #define	sctps_pa_max_retr_low		sctps_params[1].sctp_param_min
93 #define	sctps_pp_max_retr		sctps_params[2].sctp_param_val
94 #define	sctps_pp_max_retr_high		sctps_params[2].sctp_param_max
95 #define	sctps_pp_max_retr_low		sctps_params[2].sctp_param_min
96 #define	sctps_cwnd_max_			sctps_params[3].sctp_param_val
97 #define	__sctps_not_used1		sctps_params[4].sctp_param_val
98 #define	sctps_smallest_nonpriv_port	sctps_params[5].sctp_param_val
99 #define	sctps_ipv4_ttl			sctps_params[6].sctp_param_val
100 #define	sctps_heartbeat_interval	sctps_params[7].sctp_param_val
101 #define	sctps_heartbeat_interval_high	sctps_params[7].sctp_param_max
102 #define	sctps_heartbeat_interval_low	sctps_params[7].sctp_param_min
103 #define	sctps_initial_mtu		sctps_params[8].sctp_param_val
104 #define	sctps_mtu_probe_interval	sctps_params[9].sctp_param_val
105 #define	sctps_new_secret_interval	sctps_params[10].sctp_param_val
106 #define	sctps_deferred_ack_interval	sctps_params[11].sctp_param_val
107 #define	sctps_snd_lowat_fraction	sctps_params[12].sctp_param_val
108 #define	sctps_ignore_path_mtu		sctps_params[13].sctp_param_val
109 #define	sctps_initial_ssthresh		sctps_params[14].sctp_param_val
110 #define	sctps_smallest_anon_port	sctps_params[15].sctp_param_val
111 #define	sctps_largest_anon_port		sctps_params[16].sctp_param_val
112 #define	sctps_xmit_hiwat		sctps_params[17].sctp_param_val
113 #define	sctps_xmit_lowat		sctps_params[18].sctp_param_val
114 #define	sctps_recv_hiwat		sctps_params[19].sctp_param_val
115 #define	sctps_max_buf			sctps_params[20].sctp_param_val
116 #define	sctps_rtt_updates		sctps_params[21].sctp_param_val
117 #define	sctps_ipv6_hoplimit		sctps_params[22].sctp_param_val
118 #define	sctps_rto_ming			sctps_params[23].sctp_param_val
119 #define	sctps_rto_ming_high		sctps_params[23].sctp_param_max
120 #define	sctps_rto_ming_low		sctps_params[23].sctp_param_min
121 #define	sctps_rto_maxg			sctps_params[24].sctp_param_val
122 #define	sctps_rto_maxg_high		sctps_params[24].sctp_param_max
123 #define	sctps_rto_maxg_low		sctps_params[24].sctp_param_min
124 #define	sctps_rto_initialg		sctps_params[25].sctp_param_val
125 #define	sctps_rto_initialg_high		sctps_params[25].sctp_param_max
126 #define	sctps_rto_initialg_low		sctps_params[25].sctp_param_min
127 #define	sctps_cookie_life		sctps_params[26].sctp_param_val
128 #define	sctps_cookie_life_high		sctps_params[26].sctp_param_max
129 #define	sctps_cookie_life_low		sctps_params[26].sctp_param_min
130 #define	sctps_max_in_streams		sctps_params[27].sctp_param_val
131 #define	sctps_max_in_streams_high	sctps_params[27].sctp_param_max
132 #define	sctps_max_in_streams_low	sctps_params[27].sctp_param_min
133 #define	sctps_initial_out_streams	sctps_params[28].sctp_param_val
134 #define	sctps_initial_out_streams_high	sctps_params[28].sctp_param_max
135 #define	sctps_initial_out_streams_low	sctps_params[28].sctp_param_min
136 #define	sctps_shutack_wait_bound	sctps_params[29].sctp_param_val
137 #define	sctps_maxburst			sctps_params[30].sctp_param_val
138 #define	sctps_addip_enabled		sctps_params[31].sctp_param_val
139 #define	sctps_recv_hiwat_minmss		sctps_params[32].sctp_param_val
140 #define	sctps_slow_start_initial	sctps_params[33].sctp_param_val
141 #define	sctps_slow_start_after_idle	sctps_params[34].sctp_param_val
142 #define	sctps_prsctp_enabled		sctps_params[35].sctp_param_val
143 #define	sctps_fast_rxt_thresh		sctps_params[36].sctp_param_val
144 #define	sctps_deferred_acks_max		sctps_params[37].sctp_param_val
145 
146 /*
147  * sctp_wroff_xtra is the extra space in front of SCTP/IP header for link
148  * layer header.  It has to be a multiple of 4.
149  */
150 #define	sctps_wroff_xtra	sctps_wroff_xtra_param->sctp_param_val
151 
152 /*
153  * Retransmission timer start and stop macro for a given faddr.
154  */
155 #define	SCTP_FADDR_TIMER_RESTART(sctp, fp, intvl)			\
156 {									\
157 	dprint(3, ("faddr_timer_restart: fp=%p %x:%x:%x:%x %d\n",	\
158 	    (void *)(fp), SCTP_PRINTADDR((fp)->faddr), (int)(intvl)));	\
159 	sctp_timer((sctp), (fp)->timer_mp, (intvl));			\
160 	(fp)->timer_running = 1;					\
161 }
162 
163 #define	SCTP_FADDR_TIMER_STOP(fp)			\
164 	ASSERT((fp)->timer_mp != NULL);			\
165 	if ((fp)->timer_running) {			\
166 		sctp_timer_stop((fp)->timer_mp);	\
167 		(fp)->timer_running = 0;		\
168 	}
169 
170 /* For per endpoint association statistics */
171 #define	SCTP_MAX_RTO(sctp, fp) {			\
172 	/*						\
173 	 * Record the maximum observed RTO,		\
174 	 * sctp_maxrto is zeroed elsewhere		\
175 	 * at the end of each stats request.		\
176 	 */						\
177 	(sctp)->sctp_maxrto =				\
178 	    MAX((sctp)->sctp_maxrto, (fp)->rto);	\
179 	DTRACE_PROBE2(sctp__maxrto, sctp_t *,		\
180 	    sctp, struct sctp_faddr_s, fp);		\
181 }
182 
183 #define	SCTP_CALC_RXT(sctp, fp)				\
184 {							\
185 	if (((fp)->rto <<= 1) > (sctp)->sctp_rto_max)	\
186 		(fp)->rto = (sctp)->sctp_rto_max;	\
187 	SCTP_MAX_RTO(sctp, fp);				\
188 }
189 
190 
191 #define	SCTP_MAX_COMBINED_HEADER_LENGTH	(60 + 12) /* Maxed out ip + sctp */
192 #define	SCTP_MAX_IP_OPTIONS_LENGTH	(60 - IP_SIMPLE_HDR_LENGTH)
193 #define	SCTP_MAX_HDR_LENGTH		60
194 #define	ICMP_MIN_SCTP_HDR_LEN	(ICMP_MIN_TP_HDR_LEN + sizeof (sctp_hdr_t))
195 
196 #define	SCTP_SECRET_LEN	16
197 
198 #define	SCTP_REFHOLD(sctp) {			\
199 	mutex_enter(&(sctp)->sctp_reflock);	\
200 	(sctp)->sctp_refcnt++;			\
201 	ASSERT((sctp)->sctp_refcnt != 0);	\
202 	mutex_exit(&(sctp)->sctp_reflock);	\
203 }
204 
205 #define	SCTP_REFRELE(sctp) {				\
206 	mutex_enter(&(sctp)->sctp_reflock);		\
207 	ASSERT((sctp)->sctp_refcnt != 0);		\
208 	if (--(sctp)->sctp_refcnt == 0) {		\
209 		mutex_exit(&(sctp)->sctp_reflock);	\
210 		CONN_DEC_REF((sctp)->sctp_connp);	\
211 	} else {					\
212 		mutex_exit(&(sctp)->sctp_reflock);	\
213 	}						\
214 }
215 
216 #define	SCTP_G_Q_REFHOLD(sctps) {					\
217 	atomic_add_32(&(sctps)->sctps_g_q_ref, 1);			\
218 	ASSERT((sctps)->sctps_g_q_ref != 0);				\
219 	DTRACE_PROBE1(sctp__g__q__refhold, sctp_stack_t, sctps);	\
220 }
221 
222 /*
223  * Decrement the reference count on sctp_g_q
224  * In architectures e.g sun4u, where atomic_add_32_nv is just
225  * a cas, we need to maintain the right memory barrier semantics
226  * as that of mutex_exit i.e all the loads and stores should complete
227  * before the cas is executed. membar_exit() does that here.
228  */
229 #define	SCTP_G_Q_REFRELE(sctps) {					\
230 	ASSERT((sctps)->sctps_g_q_ref != 0);				\
231 	membar_exit();							\
232 	DTRACE_PROBE1(sctp__g__q__refrele, sctp_stack_t, sctps);	\
233 	if (atomic_add_32_nv(&(sctps)->sctps_g_q_ref, -1) == 0)		\
234 		sctp_g_q_inactive(sctps);				\
235 }
236 
237 #define	SCTP_PRINTADDR(a)	(a).s6_addr32[0], (a).s6_addr32[1],\
238 				(a).s6_addr32[2], (a).s6_addr32[3]
239 
240 #define	CONN2SCTP(conn)	((sctp_t *)(&((conn_t *)conn)[1]))
241 
242 /*
243  * Outbound data, flags and macros for per-message, per-chunk info
244  */
245 typedef struct {
246 	int64_t		smh_ttl;		/* Time to Live */
247 	int64_t		smh_tob;		/* Time of Birth */
248 	uint32_t	smh_context;
249 	uint16_t	smh_sid;
250 	uint16_t	smh_ssn;
251 	uint32_t	smh_ppid;
252 	uint16_t	smh_flags;
253 	uint32_t	smh_msglen;
254 } sctp_msg_hdr_t;
255 
256 #define	SCTP_CHUNK_FLAG_SENT		0x01
257 #define	SCTP_CHUNK_FLAG_REXMIT		0x02
258 #define	SCTP_CHUNK_FLAG_ACKED		0x04
259 #define	SCTP_MSG_FLAG_CHUNKED		0x08
260 #define	SCTP_MSG_FLAG_ABANDONED		0x10
261 #define	SCTP_CHUNK_FLAG_ABANDONED	0x20
262 
263 #define	SCTP_CHUNK_CLEAR_FLAGS(mp) ((mp)->b_flag = 0)
264 /*
265  * If we are transmitting the chunk for the first time we assign the TSN and
266  * SSN here. The reason we assign the SSN here (as opposed to doing it in
267  * sctp_chunkify()) is that the chunk may expire, if PRSCTP is enabled, before
268  * we get a chance to send it out. If we assign the SSN in sctp_chunkify()
269  * and this happens, then we need to send a Forward TSN to the peer, which
270  * will be expecting this SSN, assuming ordered. If we assign it here we
271  * can just take out the chunk from the transmit list without having to
272  * send a Forward TSN chunk. While assigning the SSN we use (meta)->b_cont
273  * to determine if it needs a new SSN (i.e. the next SSN for the stream),
274  * since (meta)->b_cont signifies the first chunk of a message (if the message
275  * is unordered, then the SSN is 0).
276  *
277  */
278 #define	SCTP_CHUNK_SENT(sctp, mp, sdc, fp, chunkdata, meta) {		\
279 	if (!SCTP_CHUNK_ISSENT(mp)) {					\
280 		sctp_msg_hdr_t	*mhdr = (sctp_msg_hdr_t *)(meta)->b_rptr; \
281 		ASSERT(!SCTP_CHUNK_ABANDONED(mp));			\
282 		(mp)->b_flag = SCTP_CHUNK_FLAG_SENT;			\
283 		(sdc)->sdh_tsn = htonl((sctp)->sctp_ltsn++);		\
284 		if ((mhdr)->smh_flags & MSG_UNORDERED) {		\
285 			(sdc)->sdh_ssn = 0;				\
286 			SCTP_DATA_SET_UBIT(sdc);			\
287 			BUMP_LOCAL((sctp)->sctp_oudchunks);		\
288 		} else {						\
289 			BUMP_LOCAL((sctp)->sctp_odchunks);		\
290 			if ((mp) == (meta)->b_cont) {			\
291 				mhdr->smh_ssn = htons(			\
292 				    (sctp)->sctp_ostrcntrs[mhdr->smh_sid]++); \
293 			}						\
294 			(sdc)->sdh_ssn = mhdr->smh_ssn;			\
295 		}							\
296 		(sctp)->sctp_unacked += (chunkdata);			\
297 		(sctp)->sctp_unsent -= (chunkdata);			\
298 		(sctp)->sctp_frwnd -= (chunkdata);			\
299 	} else {							\
300 		if (SCTP_CHUNK_ISACKED(mp)) {				\
301 			(sctp)->sctp_unacked += (chunkdata);		\
302 		} else {						\
303 			ASSERT(SCTP_CHUNK_DEST(mp)->suna >= ((chunkdata) + \
304 							sizeof (*sdc))); \
305 			SCTP_CHUNK_DEST(mp)->suna -= ((chunkdata) + 	\
306 					sizeof (*sdc));			\
307 		}							\
308 		(mp)->b_flag &= ~(SCTP_CHUNK_FLAG_REXMIT |		\
309 			SCTP_CHUNK_FLAG_ACKED);				\
310 		SCTP_CHUNK_SET_SACKCNT(mp, 0);				\
311 		BUMP_LOCAL(sctp->sctp_rxtchunks);			\
312 		BUMP_LOCAL((sctp)->sctp_T3expire);			\
313 		BUMP_LOCAL((fp)->T3expire);				\
314 	}								\
315 	SCTP_SET_CHUNK_DEST(mp, fp);					\
316 	(fp)->suna += ((chunkdata) + sizeof (*sdc));			\
317 }
318 
319 #define	SCTP_CHUNK_ISSENT(mp)	((mp)->b_flag & SCTP_CHUNK_FLAG_SENT)
320 #define	SCTP_CHUNK_CANSEND(mp)	\
321 	(!(SCTP_CHUNK_ABANDONED(mp)) &&	\
322 	(((mp)->b_flag & (SCTP_CHUNK_FLAG_REXMIT|SCTP_CHUNK_FLAG_SENT)) != \
323 	SCTP_CHUNK_FLAG_SENT))
324 
325 #define	SCTP_CHUNK_DEST(mp)		((sctp_faddr_t *)(mp)->b_queue)
326 #define	SCTP_SET_CHUNK_DEST(mp, fp)	((mp)->b_queue = (queue_t *)fp)
327 
328 #define	SCTP_CHUNK_REXMIT(mp)	((mp)->b_flag |= SCTP_CHUNK_FLAG_REXMIT)
329 #define	SCTP_CHUNK_CLEAR_REXMIT(mp) ((mp)->b_flag &= ~SCTP_CHUNK_FLAG_REXMIT)
330 #define	SCTP_CHUNK_WANT_REXMIT(mp) ((mp)->b_flag & SCTP_CHUNK_FLAG_REXMIT)
331 
332 #define	SCTP_CHUNK_ACKED(mp) \
333 	((mp)->b_flag = (SCTP_CHUNK_FLAG_SENT|SCTP_CHUNK_FLAG_ACKED))
334 #define	SCTP_CHUNK_ISACKED(mp)	((mp)->b_flag & SCTP_CHUNK_FLAG_ACKED)
335 #define	SCTP_CHUNK_CLEAR_ACKED(mp) ((mp)->b_flag &= ~SCTP_CHUNK_FLAG_ACKED)
336 
337 #define	SCTP_CHUNK_SACKCNT(mp)	((intptr_t)((mp)->b_prev))
338 #define	SCTP_CHUNK_SET_SACKCNT(mp, val) ((mp)->b_prev = \
339 					(mblk_t *)(uintptr_t)(val))
340 
341 #define	SCTP_MSG_SET_CHUNKED(mp)	((mp)->b_flag |= SCTP_MSG_FLAG_CHUNKED)
342 #define	SCTP_MSG_CLEAR_CHUNKED(mp)((mp)->b_flag &= ~SCTP_MSG_FLAG_CHUNKED)
343 #define	SCTP_IS_MSG_CHUNKED(mp)	((mp)->b_flag & SCTP_MSG_FLAG_CHUNKED)
344 
345 /* For PR-SCTP */
346 #define	SCTP_ABANDON_CHUNK(mp)	((mp)->b_flag |= SCTP_CHUNK_FLAG_ABANDONED)
347 #define	SCTP_CHUNK_ABANDONED(mp) \
348 	((mp)->b_flag & SCTP_CHUNK_FLAG_ABANDONED)
349 
350 #define	SCTP_MSG_SET_ABANDONED(mp)	\
351 	((mp)->b_flag |= SCTP_MSG_FLAG_ABANDONED)
352 #define	SCTP_MSG_CLEAR_ABANDONED(mp)((mp)->b_flag &= ~SCTP_MSG_FLAG_ABANDONED)
353 #define	SCTP_IS_MSG_ABANDONED(mp)	((mp)->b_flag & SCTP_MSG_FLAG_ABANDONED)
354 
355 /*
356  * Check if a message has expired.  A message is expired if
357  *	1. It has a non-zero time to live value and has not been sent before
358  *	that time expires.
359  *	2. It is sent using PRSCTP and it has not been SACK'ed before
360  *	its lifetime expires.
361  */
362 #define	SCTP_MSG_TO_BE_ABANDONED(meta, mhdr, sctp)			     \
363 	(((!SCTP_CHUNK_ISSENT((meta)->b_cont) && (mhdr)->smh_ttl > 0) ||     \
364 	((sctp)->sctp_prsctp_aware && ((mhdr)->smh_flags & MSG_PR_SCTP))) && \
365 	((lbolt64 - (mhdr)->smh_tob) > (mhdr)->smh_ttl))
366 
367 /* SCTP association hash function. */
368 #define	SCTP_CONN_HASH(sctps, ports)			\
369 	((((ports) ^ ((ports) >> 16)) * 31) & 		\
370 	    ((sctps)->sctps_conn_hash_size - 1))
371 
372 /*
373  * Bind hash array size and hash function.  The size must be a power
374  * of 2 and lport must be in host byte order.
375  */
376 #define	SCTP_BIND_FANOUT_SIZE	2048
377 #define	SCTP_BIND_HASH(lport)	(((lport) * 31) & (SCTP_BIND_FANOUT_SIZE - 1))
378 
379 /* options that SCTP negotiates during association establishment */
380 #define	SCTP_PRSCTP_OPTION	0x01
381 
382 /*
383  * Listener hash array size and hash function.  The size must be a power
384  * of 2 and lport must be in host byte order.
385  */
386 #define	SCTP_LISTEN_FANOUT_SIZE	512
387 #define	SCTP_LISTEN_HASH(lport) (((lport) * 31) & (SCTP_LISTEN_FANOUT_SIZE - 1))
388 
389 typedef struct sctp_tf_s {
390 	struct sctp_s	*tf_sctp;
391 	kmutex_t	tf_lock;
392 } sctp_tf_t;
393 
394 /* Round up the value to the nearest mss. */
395 #define	MSS_ROUNDUP(value, mss)		((((value) - 1) / (mss) + 1) * (mss))
396 
397 extern sin_t	sctp_sin_null;	/* Zero address for quick clears */
398 extern sin6_t	sctp_sin6_null;	/* Zero address for quick clears */
399 
400 #define	SCTP_IS_DETACHED(sctp)		((sctp)->sctp_detached)
401 
402 /*
403  * Object to represent database of options to search passed to
404  * {sock,tpi}optcom_req() interface routine to take care of option
405  * management and associated methods.
406  * XXX These and other externs should ideally move to a SCTP header
407  */
408 extern optdb_obj_t	sctp_opt_obj;
409 extern uint_t		sctp_max_optbuf_len;
410 
411 /* Data structure used to track received TSNs */
412 typedef struct sctp_set_s {
413 	struct sctp_set_s *next;
414 	struct sctp_set_s *prev;
415 	uint32_t begin;
416 	uint32_t end;
417 } sctp_set_t;
418 
419 /* Data structure used to track TSNs for PR-SCTP */
420 typedef struct sctp_ftsn_set_s {
421 	struct sctp_ftsn_set_s *next;
422 	ftsn_entry_t	ftsn_entries;
423 } sctp_ftsn_set_t;
424 
425 /* Data structure used to track incoming SCTP streams */
426 typedef struct sctp_instr_s {
427 	mblk_t		*istr_msgs;
428 	int		istr_nmsgs;
429 	uint16_t	nextseq;
430 	struct sctp_s	*sctp;
431 	mblk_t		*istr_reass;
432 } sctp_instr_t;
433 
434 /* Reassembly data structure (per-stream) */
435 typedef struct sctp_reass_s {
436 	uint16_t	ssn;
437 	uint16_t	needed;
438 	uint16_t	got;
439 	uint16_t	msglen;		/* len of consecutive fragments */
440 					/* from the begining (B-bit) */
441 	mblk_t		*tail;
442 	boolean_t	hasBchunk;	/* If the fragment list begins with */
443 					/* a B-bit set chunk */
444 	uint32_t	nexttsn;	/* TSN of the next fragment we */
445 					/* are expecting */
446 	boolean_t	partial_delivered;
447 } sctp_reass_t;
448 
449 /* debugging */
450 #undef	dprint
451 #ifdef DEBUG
452 extern int sctpdebug;
453 #define	dprint(level, args)	{ if (sctpdebug > (level)) printf args; }
454 #else
455 #define	dprint(level, args) {}
456 #endif
457 
458 
459 /* Peer address tracking */
460 
461 /*
462  * States for peer addresses
463  *
464  * SCTP_FADDRS_UNCONFIRMED: we have not communicated with this peer address
465  *     before, mark it as unconfirmed so that we will not send data to it.
466  *     All addresses initially are in unconfirmed state and required
467  *     validation.  SCTP sends a heartbeat to each of them and when it gets
468  *     back a heartbeat ACK, the address will be marked as alive.  This
469  *     validation fixes a security issue with multihoming.  If an attacker
470  *     establishes an association with us and tells us that it has addresses
471  *     belonging to another host A, this will prevent A from communicating
472  *     with us.  This is fixed by peer address validation.  In the above case,
473  *     A will respond with an abort.
474  *
475  * SCTP_FADDRS_ALIVE: this peer address is alive and we can communicate with
476  *     it with no problem.
477  *
478  * SCTP_FADDRS_DOWN: we have exceeded the retransmission limit to this
479  *     peer address.  Once an address is marked down, we will only send
480  *     a heartbeat to it every hb_interval in case it becomes alive now.
481  *
482  * SCTP_FADDRS_UNREACH: there is no suitable source address to send to
483  *     this peer address.  For example, the peer address is v6 but we only
484  *     have v4 addresses.  It is marked unreachable until there is an
485  *     address configuration change.  At that time, mark these addresses
486  *     as unconfirmed and try again to see if those unreachable addresses
487  *     are OK as we may have more source addresses.
488  */
489 typedef enum {
490 	SCTP_FADDRS_UNREACH,
491 	SCTP_FADDRS_DOWN,
492 	SCTP_FADDRS_ALIVE,
493 	SCTP_FADDRS_UNCONFIRMED
494 } faddr_state_t;
495 
496 typedef struct sctp_faddr_s {
497 	struct sctp_faddr_s *next;
498 	faddr_state_t	state;
499 
500 	in6_addr_t	faddr;
501 	in6_addr_t	saddr;
502 
503 	int64_t		hb_expiry;	/* time to retransmit heartbeat */
504 	uint32_t	hb_interval;	/* the heartbeat interval */
505 
506 	int		rto;		/* RTO in tick */
507 	int		srtt;		/* Smoothed RTT in tick */
508 	int		rttvar;		/* RTT variance in tick */
509 	uint32_t	rtt_updates;
510 	int		strikes;
511 	int		max_retr;
512 	uint32_t	sfa_pmss;
513 	uint32_t	cwnd;
514 	uint32_t	ssthresh;
515 	uint32_t	suna;		/* sent - unack'ed */
516 	uint32_t	pba;		/* partial bytes acked */
517 	uint32_t	acked;
518 	int64_t		lastactive;
519 	mblk_t		*timer_mp;	/* retransmission timer control */
520 	uint32_t
521 			hb_pending : 1,
522 			timer_running : 1,
523 			df : 1,
524 			pmtu_discovered : 1,
525 
526 			rc_timer_running : 1,
527 			isv4 : 1,
528 			hb_enabled : 1;
529 
530 	mblk_t		*rc_timer_mp;	/* reliable control chunk timer */
531 	ire_t		*ire;		/* cached IRE */
532 	uint32_t	T3expire;	/* # of times T3 timer expired */
533 
534 	uint64_t	hb_secret;	/* per addr "secret" in heartbeat */
535 	uint32_t	rxt_unacked;	/* # unack'ed retransmitted bytes */
536 } sctp_faddr_t;
537 
538 /* Flags to indicate supported address type in the PARM_SUP_ADDRS. */
539 #define	PARM_SUPP_V6	0x1
540 #define	PARM_SUPP_V4	0x2
541 
542 /*
543  * Set heartbeat interval plus jitter.  The jitter is supposed to be random,
544  * up to +/- 50% of the RTO.  We use gethrtime() here for  performance reason
545  * as the jitter does not really need to be "very" random.
546  */
547 #define	SET_HB_INTVL(fp)					\
548 	((fp)->hb_interval + (fp)->rto + ((fp)->rto >> 1) -	\
549 	(uint_t)gethrtime() % (fp)->rto)
550 
551 #define	SCTP_IPIF_HASH	16
552 
553 typedef	struct	sctp_ipif_hash_s {
554 	list_t	sctp_ipif_list;
555 	int	ipif_count;
556 } sctp_ipif_hash_t;
557 
558 
559 /*
560  * Initialize cwnd according to RFC 3390.  def_max_init_cwnd is
561  * either sctp_slow_start_initial or sctp_slow_start_after idle
562  * depending on the caller.
563  */
564 #define	SET_CWND(fp, mss, def_max_init_cwnd)				\
565 {									\
566 	(fp)->cwnd = MIN(def_max_init_cwnd * (mss),			\
567 	    MIN(4 * (mss), MAX(2 * (mss), 4380 / (mss) * (mss))));	\
568 }
569 
570 
571 struct sctp_s;
572 
573 /*
574  * Control structure for each open SCTP stream,
575  * defined only within the kernel or for a kmem user.
576  * NOTE: sctp_reinit_values MUST have a line for each field in this structure!
577  */
578 #if (defined(_KERNEL) || defined(_KMEMUSER))
579 
580 typedef struct sctp_s {
581 
582 	/*
583 	 * The following is shared with (and duplicated) in IP, so if you
584 	 * make changes, make sure you also change things in ip_sctp.c.
585 	 */
586 	struct sctp_s	*sctp_conn_hash_next;
587 	struct sctp_s	*sctp_conn_hash_prev;
588 
589 	struct sctp_s	*sctp_listen_hash_next;
590 	struct sctp_s	*sctp_listen_hash_prev;
591 
592 	sctp_tf_t	*sctp_listen_tfp;	/* Ptr to tf */
593 	sctp_tf_t	*sctp_conn_tfp;		/* Ptr to tf */
594 
595 	/* Global list of sctp */
596 	list_node_t	sctp_list;
597 
598 	sctp_faddr_t		*sctp_faddrs;
599 	int			sctp_nfaddrs;
600 	sctp_ipif_hash_t	sctp_saddrs[SCTP_IPIF_HASH];
601 	int			sctp_nsaddrs;
602 
603 	/*
604 	 * These fields contain the same information as sctp_sctph->th_*port.
605 	 * However, the lookup functions can not use the header fields
606 	 * since during IP option manipulation the sctp_sctph pointer
607 	 * changes.
608 	 */
609 	union {
610 		struct {
611 			in_port_t	sctpu_fport;	/* Remote port */
612 			in_port_t	sctpu_lport;	/* Local port */
613 		} sctpu_ports1;
614 		uint32_t		sctpu_ports2;	/* Rem port, */
615 							/* local port */
616 					/* Used for SCTP_MATCH performance */
617 	} sctp_sctpu;
618 #define	sctp_fport	sctp_sctpu.sctpu_ports1.sctpu_fport
619 #define	sctp_lport	sctp_sctpu.sctpu_ports1.sctpu_lport
620 #define	sctp_ports	sctp_sctpu.sctpu_ports2
621 
622 	kmutex_t	sctp_lock;
623 	kcondvar_t	sctp_cv;
624 	boolean_t	sctp_running;
625 
626 #define	sctp_ulpd	sctp_connp->conn_upper_handle
627 #define	sctp_upcalls	sctp_connp->conn_upcalls
628 
629 #define	sctp_ulp_newconn	sctp_upcalls->su_newconn
630 #define	sctp_ulp_connected	sctp_upcalls->su_connected
631 #define	sctp_ulp_disconnected	sctp_upcalls->su_disconnected
632 #define	sctp_ulp_opctl		sctp_upcalls->su_opctl
633 #define	sctp_ulp_recv		sctp_upcalls->su_recv
634 #define	sctp_ulp_xmitted	sctp_upcalls->su_txq_full
635 #define	sctp_ulp_prop		sctp_upcalls->su_set_proto_props
636 
637 	int32_t		sctp_state;
638 
639 	conn_t		*sctp_connp;		/* conn_t stuff */
640 #define	sctp_zoneid	sctp_connp->conn_zoneid
641 #define	sctp_allzones	sctp_connp->conn_allzones
642 #define	sctp_mac_exempt	sctp_connp->conn_mac_exempt
643 #define	sctp_credp	sctp_connp->conn_cred
644 #define	sctp_reuseaddr	sctp_connp->conn_reuseaddr
645 
646 	sctp_stack_t	*sctp_sctps;
647 
648 	/* Peer address tracking */
649 	sctp_faddr_t	*sctp_lastfaddr;	/* last faddr in list */
650 	sctp_faddr_t	*sctp_primary;		/* primary faddr */
651 	sctp_faddr_t	*sctp_current;		/* current faddr */
652 	sctp_faddr_t	*sctp_lastdata;		/* last data seen from this */
653 
654 	/* Outbound data tracking */
655 	mblk_t		*sctp_xmit_head;
656 	mblk_t		*sctp_xmit_tail;
657 	mblk_t		*sctp_xmit_unsent;
658 	mblk_t		*sctp_xmit_unsent_tail;
659 	mblk_t		*sctp_xmit_unacked;
660 
661 	int32_t		sctp_unacked;		/* # of unacked bytes */
662 	int32_t		sctp_unsent;		/* # of unsent bytes in hand */
663 
664 	uint32_t	sctp_ltsn;		/* Local instance TSN */
665 	uint32_t	sctp_lastack_rxd;	/* Last rx'd cumtsn */
666 	uint32_t	sctp_recovery_tsn;	/* Exit from fast recovery */
667 	uint32_t	sctp_adv_pap;		/* Adv. Peer Ack Point */
668 
669 	uint16_t	sctp_num_ostr;
670 	uint16_t	*sctp_ostrcntrs;
671 
672 	mblk_t		*sctp_pad_mp;		/* pad unaligned data chunks */
673 
674 	/* sendmsg() default parameters */
675 	uint16_t	sctp_def_stream;	/* default stream id */
676 	uint16_t	sctp_def_flags;		/* default xmit flags */
677 	uint32_t	sctp_def_ppid;		/* default payload id */
678 	uint32_t	sctp_def_context;	/* default context */
679 	uint32_t	sctp_def_timetolive;	/* default msg TTL */
680 
681 	/* Inbound data tracking */
682 	sctp_set_t	*sctp_sack_info;	/* Sack tracking */
683 	mblk_t		*sctp_ack_mp;		/* Delayed ACK timer block */
684 	sctp_instr_t	*sctp_instr;		/* Instream trackers */
685 	mblk_t		*sctp_uo_frags;		/* Un-ordered msg. fragments */
686 	uint32_t	sctp_ftsn;		/* Peer's TSN */
687 	uint32_t	sctp_lastacked;		/* last cumtsn SACKd */
688 	uint16_t	sctp_num_istr;		/* No. of instreams */
689 	int32_t		sctp_istr_nmsgs;	/* No. of chunks in instreams */
690 	int32_t		sctp_sack_gaps;		/* No. of received gaps */
691 	int32_t		sctp_sack_toggle;	/* SACK every other pkt */
692 
693 	/* RTT calculation */
694 	uint32_t	sctp_rtt_tsn;
695 	int64_t		sctp_out_time;
696 
697 	/* Stats can be reset by snmp users kstat, netstat and snmp agents */
698 	uint64_t	sctp_opkts;		/* sent pkts */
699 	uint64_t	sctp_obchunks;		/* sent control chunks */
700 	uint64_t	sctp_odchunks;		/* sent ordered data chunks */
701 	uint64_t	sctp_oudchunks;		/* sent unord data chunks */
702 	uint64_t	sctp_rxtchunks;		/* retransmitted chunks */
703 	uint64_t	sctp_ipkts;		/* recv pkts */
704 	uint64_t	sctp_ibchunks;		/* recv control chunks */
705 	uint64_t	sctp_idchunks;		/* recv ordered data chunks */
706 	uint64_t	sctp_iudchunks;		/* recv unord data chunks */
707 	uint64_t	sctp_fragdmsgs;
708 	uint64_t	sctp_reassmsgs;
709 	uint32_t	sctp_T1expire;		/* # of times T1timer expired */
710 	uint32_t	sctp_T2expire;		/* # of times T2timer expired */
711 	uint32_t	sctp_T3expire;		/* # of times T3timer expired */
712 	uint32_t	sctp_assoc_start_time;	/* time when assoc was est. */
713 
714 	/* Outbound flow control */
715 	int32_t		sctp_xmit_hiwater;	/* Send high water mark */
716 	int32_t		sctp_xmit_lowater;	/* Send low water mark */
717 	uint32_t	sctp_frwnd;		/* Peer RWND */
718 	uint32_t	sctp_cwnd_max;
719 
720 	/* Inbound flow control */
721 	int32_t		sctp_rwnd;		/* Current receive window */
722 	int32_t		sctp_irwnd;		/* Initial receive window */
723 	int32_t		sctp_rxqueued;		/* No. of bytes in RX q's */
724 
725 	/* Pre-initialized composite headers */
726 	char		*sctp_iphc;	/* v4 sctp/ip hdr template buffer */
727 	char		*sctp_iphc6;	/* v6 sctp/ip hdr template buffer */
728 
729 	int32_t		sctp_iphc_len;	/* actual allocated v4 buffer size */
730 	int32_t		sctp_iphc6_len;	/* actual allocated v6 buffer size */
731 
732 	int32_t		sctp_hdr_len;	/* len of combined SCTP/IP v4 hdr */
733 	int32_t		sctp_hdr6_len;	/* len of combined SCTP/IP v6 hdr */
734 
735 	ipha_t		*sctp_ipha;	/* IPv4 header in the buffer */
736 	ip6_t		*sctp_ip6h;	/* IPv6 header in the buffer */
737 
738 	int32_t		sctp_ip_hdr_len; /* Byte len of our current v4 hdr */
739 	int32_t		sctp_ip_hdr6_len; /* Byte len of our current v6 hdr */
740 
741 	sctp_hdr_t	*sctp_sctph;	/* sctp header in combined v4 hdr */
742 	sctp_hdr_t	*sctp_sctph6;	/* sctp header in combined v6 hdr */
743 
744 	uint32_t	sctp_lvtag;	/* local SCTP instance verf tag */
745 	uint32_t	sctp_fvtag;	/* Peer's SCTP verf tag */
746 
747 	/* Path MTU Discovery */
748 	int64_t		sctp_last_mtu_probe;
749 	clock_t		sctp_mtu_probe_intvl;
750 	uint32_t	sctp_mss;	/* Max send size (not TCP MSS!) */
751 
752 	/* structs sctp_bits, sctp_events are for clearing all bits at once */
753 	struct {
754 		uint32_t
755 
756 		sctp_understands_asconf : 1, /* Peer handles ASCONF chunks */
757 		sctp_debug : 1,		/* SO_DEBUG "socket" option. */
758 		sctp_cchunk_pend : 1,	/* Control chunk in flight. */
759 		sctp_dgram_errind : 1,	/* SO_DGRAM_ERRIND option */
760 
761 		sctp_linger : 1,	/* SO_LINGER turned on */
762 		sctp_lingering : 1,	/* Lingering in close */
763 		sctp_loopback: 1,	/* src and dst are the same machine */
764 		sctp_force_sack : 1,
765 
766 		sctp_ack_timer_running: 1,	/* Delayed ACK timer running */
767 		sctp_recvdstaddr : 1,	/* return T_EXTCONN_IND with dstaddr */
768 		sctp_hwcksum : 1,	/* The NIC is capable of hwcksum */
769 		sctp_understands_addip : 1,
770 
771 		sctp_bound_to_all : 1,
772 		sctp_cansleep : 1,	/* itf routines can sleep */
773 		sctp_detached : 1,	/* If we're detached from a stream */
774 		sctp_send_adaptation : 1,	/* send adaptation layer ind */
775 
776 		sctp_recv_adaptation : 1,	/* recv adaptation layer ind */
777 		sctp_ndelay : 1,	/* turn off Nagle */
778 		sctp_condemned : 1,	/* this sctp is about to disappear */
779 		sctp_chk_fast_rexmit : 1, /* check for fast rexmit message */
780 
781 		sctp_prsctp_aware : 1,	/* is peer PR-SCTP aware? */
782 		sctp_linklocal : 1,	/* is linklocal assoc. */
783 		sctp_rexmitting : 1,	/* SCTP is retransmitting */
784 		sctp_zero_win_probe : 1,	/* doing zero win probe */
785 
786 		sctp_txq_full : 1,	/* the tx queue is full */
787 		sctp_ulp_discon_done : 1,	/* ulp_disconnecting done */
788 		sctp_dummy : 6;
789 	} sctp_bits;
790 	struct {
791 		uint32_t
792 
793 		sctp_recvsndrcvinfo : 1,
794 		sctp_recvassocevnt : 1,
795 		sctp_recvpathevnt : 1,
796 		sctp_recvsendfailevnt : 1,
797 
798 		sctp_recvpeererr : 1,
799 		sctp_recvshutdownevnt : 1,
800 		sctp_recvpdevnt : 1,
801 		sctp_recvalevnt : 1;
802 	} sctp_events;
803 #define	sctp_priv_stream sctp_bits.sctp_priv_stream
804 #define	sctp_understands_asconf sctp_bits.sctp_understands_asconf
805 #define	sctp_debug sctp_bits.sctp_debug
806 #define	sctp_cchunk_pend sctp_bits.sctp_cchunk_pend
807 #define	sctp_dgram_errind sctp_bits.sctp_dgram_errind
808 #define	sctp_linger sctp_bits.sctp_linger
809 #define	sctp_lingering sctp_bits.sctp_lingering
810 #define	sctp_loopback sctp_bits.sctp_loopback
811 #define	sctp_force_sack sctp_bits.sctp_force_sack
812 #define	sctp_ack_timer_running sctp_bits.sctp_ack_timer_running
813 #define	sctp_recvdstaddr sctp_bits.sctp_recvdstaddr
814 #define	sctp_hwcksum sctp_bits.sctp_hwcksum
815 #define	sctp_understands_addip sctp_bits.sctp_understands_addip
816 #define	sctp_bound_to_all sctp_bits.sctp_bound_to_all
817 #define	sctp_cansleep sctp_bits.sctp_cansleep
818 #define	sctp_detached sctp_bits.sctp_detached
819 #define	sctp_send_adaptation sctp_bits.sctp_send_adaptation
820 #define	sctp_recv_adaptation sctp_bits.sctp_recv_adaptation
821 #define	sctp_ndelay sctp_bits.sctp_ndelay
822 #define	sctp_condemned sctp_bits.sctp_condemned
823 #define	sctp_chk_fast_rexmit sctp_bits.sctp_chk_fast_rexmit
824 #define	sctp_prsctp_aware sctp_bits.sctp_prsctp_aware
825 #define	sctp_linklocal sctp_bits.sctp_linklocal
826 #define	sctp_rexmitting sctp_bits.sctp_rexmitting
827 #define	sctp_zero_win_probe sctp_bits.sctp_zero_win_probe
828 #define	sctp_txq_full sctp_bits.sctp_txq_full
829 #define	sctp_ulp_discon_done sctp_bits.sctp_ulp_discon_done
830 
831 #define	sctp_recvsndrcvinfo sctp_events.sctp_recvsndrcvinfo
832 #define	sctp_recvassocevnt sctp_events.sctp_recvassocevnt
833 #define	sctp_recvpathevnt sctp_events.sctp_recvpathevnt
834 #define	sctp_recvsendfailevnt sctp_events.sctp_recvsendfailevnt
835 #define	sctp_recvpeererr sctp_events.sctp_recvpeererr
836 #define	sctp_recvshutdownevnt sctp_events.sctp_recvshutdownevnt
837 #define	sctp_recvpdevnt sctp_events.sctp_recvpdevnt
838 #define	sctp_recvalevnt sctp_events.sctp_recvalevnt
839 
840 	/* Retransmit info */
841 	mblk_t		*sctp_cookie_mp; /* cookie chunk, if rxt needed */
842 	int32_t		sctp_strikes;	/* Total number of assoc strikes */
843 	int32_t		sctp_max_init_rxt;
844 	int32_t		sctp_pa_max_rxt; /* Max per-assoc retransmit cnt */
845 	int32_t		sctp_pp_max_rxt; /* Max per-path retransmit cnt */
846 	uint32_t	sctp_rto_max;
847 	uint32_t	sctp_init_rto_max;
848 	uint32_t	sctp_rto_min;
849 	uint32_t	sctp_rto_initial;
850 
851 	int64_t		sctp_last_secret_update;
852 	uint8_t		sctp_secret[SCTP_SECRET_LEN]; /* for cookie auth */
853 	uint8_t		sctp_old_secret[SCTP_SECRET_LEN];
854 	uint32_t	sctp_cookie_lifetime;	/* cookie lifetime in tick */
855 
856 	/*
857 	 * Address family that app wishes returned addrsses to be in.
858 	 * Currently taken from address family used in T_BIND_REQ, but
859 	 * should really come from family used in original socket() call.
860 	 * Value can be AF_INET or AF_INET6.
861 	 */
862 	uint_t		sctp_family;
863 	ushort_t	sctp_ipversion;
864 
865 	/* Bind hash tables */
866 	kmutex_t	*sctp_bind_lockp;	/* Ptr to tf_lock */
867 	struct sctp_s	*sctp_bind_hash;
868 	struct sctp_s **sctp_ptpbhn;
869 
870 	/* Shutdown / cleanup */
871 	sctp_faddr_t	*sctp_shutdown_faddr;	/* rotate faddr during shutd */
872 	int32_t		sctp_client_errno;	/* How the client screwed up */
873 	int		sctp_lingertime; /* Close linger time (in seconds) */
874 	kmutex_t	sctp_reflock;	/* Protects sctp_refcnt & timer mp */
875 	ushort_t	sctp_refcnt;	/* No. of pending upstream msg */
876 	mblk_t		*sctp_timer_mp;	/* List of fired timers. */
877 
878 	/* Misc */
879 	uint_t		sctp_bound_if;	/* IPV6_BOUND_IF */
880 
881 	mblk_t		*sctp_heartbeat_mp; /* Timer block for heartbeats */
882 	uint32_t	sctp_hb_interval; /* Default hb_interval */
883 
884 	int32_t		sctp_autoclose;	/* Auto disconnect in ticks */
885 	int64_t		sctp_active;	/* Last time data/sack on this conn */
886 	uint32_t	sctp_tx_adaptation_code; /* TX adaptation code */
887 	uint32_t	sctp_rx_adaptation_code; /* RX adaptation code */
888 
889 	/* Reliable control chunks */
890 	mblk_t		*sctp_cxmit_list; /* Xmit list for control chunks */
891 	uint32_t	sctp_lcsn;	/* Our serial number */
892 	uint32_t	sctp_fcsn;	/* Peer serial number */
893 
894 	/* Per association receive queue */
895 	kmutex_t	sctp_recvq_lock;
896 	mblk_t		*sctp_recvq;
897 	mblk_t		*sctp_recvq_tail;
898 	taskq_t		*sctp_recvq_tq;
899 
900 	/* Send queue to IP */
901 	kmutex_t	sctp_sendq_lock;
902 	mblk_t		*sctp_sendq;
903 	mblk_t		*sctp_sendq_tail;
904 	boolean_t	sctp_sendq_sending;
905 
906 	/* IPv6 ancillary data */
907 	uint_t		sctp_ipv6_recvancillary;	/* flags */
908 #define	SCTP_IPV6_RECVPKTINFO	0x01		/* IPV6_RECVPKTINFO opt */
909 #define	SCTP_IPV6_RECVHOPLIMIT	0x02		/* IPV6_RECVHOPLIMIT opt */
910 #define	SCTP_IPV6_RECVHOPOPTS	0x04		/* IPV6_RECVHOPOPTS opt */
911 #define	SCTP_IPV6_RECVDSTOPTS	0x08		/* IPV6_RECVDSTOPTS opt */
912 #define	SCTP_IPV6_RECVRTHDR	0x10		/* IPV6_RECVRTHDR opt */
913 #define	SCTP_IPV6_RECVRTDSTOPTS	0x20		/* IPV6_RECVRTHDRDSTOPTS opt */
914 
915 	uint_t		sctp_recvifindex;	/* last rcvd IPV6_RCVPKTINFO */
916 	uint_t		sctp_recvhops;		/*  " IPV6_RECVHOPLIMIT */
917 	ip6_hbh_t	*sctp_hopopts;		/*  " IPV6_RECVHOPOPTS */
918 	ip6_dest_t	*sctp_dstopts;		/*  " IPV6_RECVDSTOPTS */
919 	ip6_dest_t	*sctp_rtdstopts;	/*  " IPV6_RECVRTHDRDSTOPTS */
920 	ip6_rthdr_t	*sctp_rthdr;		/*  " IPV6_RECVRTHDR */
921 	uint_t		sctp_hopoptslen;
922 	uint_t		sctp_dstoptslen;
923 	uint_t		sctp_rtdstoptslen;
924 	uint_t		sctp_rthdrlen;
925 
926 	ip6_pkt_t	sctp_sticky_ipp;	/* Sticky options */
927 #define	sctp_ipp_fields		sctp_sticky_ipp.ipp_fields
928 #define	sctp_ipp_ifindex	sctp_sticky_ipp.ipp_ifindex
929 #define	sctp_ipp_addr		sctp_sticky_ipp.ipp_addr
930 #define	sctp_ipp_hoplimit	sctp_sticky_ipp.ipp_hoplimit
931 #define	sctp_ipp_hopoptslen	sctp_sticky_ipp.ipp_hopoptslen
932 #define	sctp_ipp_rtdstoptslen	sctp_sticky_ipp.ipp_rtdstoptslen
933 #define	sctp_ipp_rthdrlen	sctp_sticky_ipp.ipp_rthdrlen
934 #define	sctp_ipp_dstoptslen	sctp_sticky_ipp.ipp_dstoptslen
935 #define	sctp_ipp_hopopts	sctp_sticky_ipp.ipp_hopopts
936 #define	sctp_ipp_rtdstopts	sctp_sticky_ipp.ipp_rtdstopts
937 #define	sctp_ipp_rthdr		sctp_sticky_ipp.ipp_rthdr
938 #define	sctp_ipp_dstopts	sctp_sticky_ipp.ipp_dstopts
939 #define	sctp_ipp_pathmtu	sctp_sticky_ipp.ipp_pathmtu
940 #define	sctp_ipp_nexthop	sctp_sticky_ipp.ipp_nexthop
941 	/* Stats */
942 	uint64_t	sctp_msgcount;
943 	uint64_t	sctp_prsctpdrop;
944 
945 	uint_t		sctp_v4label_len;	/* length of cached v4 label */
946 	uint_t		sctp_v6label_len;	/* length of cached v6 label */
947 	uint32_t	sctp_rxt_nxttsn;	/* Next TSN to be rexmitted */
948 	uint32_t	sctp_rxt_maxtsn;	/* Max TSN sent at time out */
949 
950 	int		sctp_pd_point;		/* Partial delivery point */
951 	mblk_t		*sctp_err_chunks;	/* Error chunks */
952 	uint32_t	sctp_err_len;		/* Total error chunks length */
953 
954 	pid_t		sctp_cpid;	/* Process id when this was opened */
955 	uint64_t	sctp_open_time;	/* time when this was opened */
956 
957 	/* additional source data for per endpoint association statistics */
958 	uint64_t	sctp_outseqtsns;	/* TSN rx > expected TSN */
959 	uint64_t	sctp_osacks;		/* total sacks sent */
960 	uint64_t	sctp_isacks;		/* total sacks received */
961 	uint64_t	sctp_idupchunks;	/* rx dups, ord or unord */
962 	uint64_t	sctp_gapcnt;		/* total gap acks rx */
963 	/*
964 	 * Add the current data from the counters which are reset by snmp
965 	 * to these cumulative counters to use in per endpoint statistics.
966 	 */
967 	uint64_t	sctp_cum_obchunks;	/* sent control chunks */
968 	uint64_t	sctp_cum_odchunks;	/* sent ordered data chunks */
969 	uint64_t	sctp_cum_oudchunks;	/* sent unord data chunks */
970 	uint64_t	sctp_cum_rxtchunks;	/* retransmitted chunks */
971 	uint64_t	sctp_cum_ibchunks;	/* recv control chunks */
972 	uint64_t	sctp_cum_idchunks;	/* recv ordered data chunks */
973 	uint64_t	sctp_cum_iudchunks;	/* recv unord data chunks */
974 
975 	/*
976 	 * When non-zero, this is the maximum observed RTO since assoc stats
977 	 * were last requested. When zero, no RTO update has occurred since
978 	 * the previous user request for stats on this endpoint.
979 	 */
980 	int	sctp_maxrto;
981 	/*
982 	 * The stored value of sctp_maxrto passed to user during the previous
983 	 * user request for stats on this endpoint.
984 	 */
985 	int	sctp_prev_maxrto;
986 } sctp_t;
987 
988 #define	SCTP_TXQ_LEN(sctp)	((sctp)->sctp_unsent + (sctp)->sctp_unacked)
989 #define	SCTP_TXQ_UPDATE(sctp)					\
990 	if ((sctp)->sctp_txq_full && SCTP_TXQ_LEN(sctp) <=	\
991 	    (sctp)->sctp_xmit_lowater) {			\
992 		(sctp)->sctp_txq_full = 0;			\
993 		(sctp)->sctp_ulp_xmitted((sctp)->sctp_ulpd,	\
994 		    B_FALSE);					\
995 	}
996 
997 #endif	/* (defined(_KERNEL) || defined(_KMEMUSER)) */
998 
999 extern void	sctp_ack_timer(sctp_t *);
1000 extern size_t	sctp_adaptation_code_param(sctp_t *, uchar_t *);
1001 extern void	sctp_adaptation_event(sctp_t *);
1002 extern void	sctp_add_err(sctp_t *, uint16_t, void *, size_t,
1003 		    sctp_faddr_t *);
1004 extern int	sctp_add_faddr(sctp_t *, in6_addr_t *, int, boolean_t);
1005 extern boolean_t sctp_add_ftsn_set(sctp_ftsn_set_t **, sctp_faddr_t *, mblk_t *,
1006 		    uint_t *, uint32_t *);
1007 extern boolean_t sctp_add_recvq(sctp_t *, mblk_t *, boolean_t);
1008 extern void	sctp_add_sendq(sctp_t *, mblk_t *);
1009 extern void	sctp_add_unrec_parm(sctp_parm_hdr_t *, mblk_t **, boolean_t);
1010 extern size_t	sctp_addr_params(sctp_t *, int, uchar_t *, boolean_t);
1011 extern mblk_t	*sctp_add_proto_hdr(sctp_t *, sctp_faddr_t *, mblk_t *, int,
1012 		    int *);
1013 extern void	sctp_addr_req(sctp_t *, mblk_t *);
1014 extern sctp_t	*sctp_addrlist2sctp(mblk_t *, sctp_hdr_t *, sctp_chunk_hdr_t *,
1015 		    zoneid_t, sctp_stack_t *);
1016 extern void	sctp_add_hdr(sctp_t *, uchar_t *, size_t);
1017 extern void	sctp_check_adv_ack_pt(sctp_t *, mblk_t *, mblk_t *);
1018 extern void	sctp_assoc_event(sctp_t *, uint16_t, uint16_t,
1019 		    sctp_chunk_hdr_t *);
1020 
1021 extern void	sctp_bind_hash_insert(sctp_tf_t *, sctp_t *, int);
1022 extern void	sctp_bind_hash_remove(sctp_t *);
1023 extern int	sctp_bindi(sctp_t *, in_port_t, boolean_t, int, in_port_t *);
1024 extern int	sctp_bind_add(sctp_t *, const void *, uint32_t, boolean_t,
1025 		    in_port_t);
1026 extern int	sctp_bind_del(sctp_t *, const void *, uint32_t, boolean_t);
1027 extern int	sctp_build_hdrs(sctp_t *);
1028 
1029 extern int	sctp_check_abandoned_msg(sctp_t *, mblk_t *);
1030 extern void	sctp_clean_death(sctp_t *, int);
1031 extern void	sctp_close_eager(sctp_t *);
1032 extern int	sctp_compare_faddrsets(sctp_faddr_t *, sctp_faddr_t *);
1033 extern void	sctp_congest_reset(sctp_t *);
1034 extern void	sctp_conn_hash_insert(sctp_tf_t *, sctp_t *, int);
1035 extern void	sctp_conn_hash_remove(sctp_t *);
1036 extern void	sctp_conn_init(conn_t *);
1037 extern sctp_t	*sctp_conn_match(in6_addr_t *, in6_addr_t *, uint32_t,
1038 		    zoneid_t, sctp_stack_t *);
1039 extern sctp_t	*sctp_conn_request(sctp_t *, mblk_t *, uint_t, uint_t,
1040 		    sctp_init_chunk_t *, mblk_t *);
1041 extern int	sctp_conprim_opt_process(queue_t *, mblk_t *, int *, int *,
1042 		    int *);
1043 extern uint32_t	sctp_cumack(sctp_t *, uint32_t, mblk_t **);
1044 extern sctp_t	*sctp_create_eager(sctp_t *);
1045 
1046 extern void	sctp_dispatch_rput(queue_t *, sctp_t *, sctp_hdr_t *, mblk_t *,
1047 		    uint_t, uint_t, in6_addr_t);
1048 extern char	*sctp_display(sctp_t *, char *);
1049 extern void	sctp_display_all(sctp_stack_t *);
1050 
1051 extern void	sctp_error_event(sctp_t *, sctp_chunk_hdr_t *);
1052 
1053 extern void	sctp_faddr_alive(sctp_t *, sctp_faddr_t *);
1054 extern int	sctp_faddr_dead(sctp_t *, sctp_faddr_t *, int);
1055 extern void	sctp_faddr_fini(void);
1056 extern void	sctp_faddr_init(void);
1057 extern void	sctp_fast_rexmit(sctp_t *);
1058 extern void	sctp_fill_sack(sctp_t *, unsigned char *, int);
1059 extern void	sctp_free_faddr_timers(sctp_t *);
1060 extern void	sctp_free_ftsn_set(sctp_ftsn_set_t *);
1061 extern void	sctp_free_msg(mblk_t *);
1062 extern void	sctp_free_reass(sctp_instr_t *);
1063 extern void	sctp_free_set(sctp_set_t *);
1064 extern void	sctp_ftsn_sets_fini(void);
1065 extern void	sctp_ftsn_sets_init(void);
1066 
1067 extern int	sctp_get_addrlist(sctp_t *, const void *, uint32_t *,
1068 		    uchar_t **, int *, size_t *);
1069 extern void	sctp_g_q_inactive(sctp_stack_t *);
1070 extern int	sctp_get_addrparams(sctp_t *, sctp_t *, mblk_t *,
1071 		    sctp_chunk_hdr_t *, uint_t *);
1072 extern void	sctp_get_ire(sctp_t *, sctp_faddr_t *);
1073 extern void	sctp_get_faddr_list(sctp_t *, uchar_t *, size_t);
1074 extern mblk_t	*sctp_get_first_sent(sctp_t *);
1075 extern mblk_t	*sctp_get_msg_to_send(sctp_t *, mblk_t **, mblk_t *, int  *,
1076 		    int32_t, uint32_t, sctp_faddr_t *);
1077 extern void	sctp_get_saddr_list(sctp_t *, uchar_t *, size_t);
1078 
1079 extern int	sctp_handle_error(sctp_t *, sctp_hdr_t *, sctp_chunk_hdr_t *,
1080 		    mblk_t *);
1081 extern void	sctp_hash_destroy(sctp_stack_t *);
1082 extern void	sctp_hash_init(sctp_stack_t *);
1083 extern int	sctp_header_init_ipv4(sctp_t *, int);
1084 extern int	sctp_header_init_ipv6(sctp_t *, int);
1085 extern void	sctp_heartbeat_timer(sctp_t *);
1086 
1087 extern void	sctp_icmp_error(sctp_t *, mblk_t *);
1088 extern void	sctp_inc_taskq(sctp_stack_t *);
1089 extern void	sctp_info_req(sctp_t *, mblk_t *);
1090 extern mblk_t	*sctp_init_mp(sctp_t *);
1091 extern boolean_t sctp_initialize_params(sctp_t *, sctp_init_chunk_t *,
1092 		    sctp_init_chunk_t *);
1093 extern uint32_t	sctp_init2vtag(sctp_chunk_hdr_t *);
1094 extern void	sctp_intf_event(sctp_t *, in6_addr_t, int, int);
1095 extern void	sctp_input_data(sctp_t *, mblk_t *, mblk_t *);
1096 extern void	sctp_instream_cleanup(sctp_t *, boolean_t);
1097 extern int	sctp_is_a_faddr_clean(sctp_t *);
1098 
1099 extern void	*sctp_kstat_init(netstackid_t);
1100 extern void	sctp_kstat_fini(netstackid_t, kstat_t *);
1101 extern void	*sctp_kstat2_init(netstackid_t, sctp_kstat_t *);
1102 extern void	sctp_kstat2_fini(netstackid_t, kstat_t *);
1103 
1104 extern ssize_t	sctp_link_abort(mblk_t *, uint16_t, char *, size_t, int,
1105 		    boolean_t);
1106 extern void	sctp_listen_hash_insert(sctp_tf_t *, sctp_t *);
1107 extern void	sctp_listen_hash_remove(sctp_t *);
1108 extern sctp_t	*sctp_lookup(sctp_t *, in6_addr_t *, sctp_tf_t *, uint32_t *,
1109 		    int);
1110 extern sctp_faddr_t *sctp_lookup_faddr(sctp_t *, in6_addr_t *);
1111 
1112 extern mblk_t	*sctp_make_err(sctp_t *, uint16_t, void *, size_t);
1113 extern mblk_t	*sctp_make_ftsn_chunk(sctp_t *, sctp_faddr_t *,
1114 		    sctp_ftsn_set_t *, uint_t, uint32_t);
1115 extern void	sctp_make_ftsns(sctp_t *, mblk_t *, mblk_t *, mblk_t **,
1116 		    sctp_faddr_t *, uint32_t *);
1117 extern mblk_t	*sctp_make_mp(sctp_t *, sctp_faddr_t *, int);
1118 extern mblk_t	*sctp_make_sack(sctp_t *, sctp_faddr_t *, mblk_t *);
1119 extern void	sctp_maxpsz_set(sctp_t *);
1120 extern void	sctp_move_faddr_timers(queue_t *, sctp_t *);
1121 
1122 extern void	sctp_nd_free(sctp_stack_t *);
1123 extern int	sctp_nd_getset(queue_t *, MBLKP);
1124 extern boolean_t sctp_nd_init(sctp_stack_t *);
1125 extern sctp_parm_hdr_t *sctp_next_parm(sctp_parm_hdr_t *, ssize_t *);
1126 
1127 extern void	sctp_ootb_shutdown_ack(sctp_t *, mblk_t *, uint_t);
1128 extern size_t	sctp_options_param(const sctp_t *, void *, int);
1129 extern size_t	sctp_options_param_len(const sctp_t *, int);
1130 extern void	sctp_output(sctp_t *, uint_t);
1131 
1132 extern boolean_t sctp_param_register(IDP *, sctpparam_t *, int, sctp_stack_t *);
1133 extern void	sctp_partial_delivery_event(sctp_t *);
1134 extern int	sctp_process_cookie(sctp_t *, sctp_chunk_hdr_t *, mblk_t *,
1135 		    sctp_init_chunk_t **, sctp_hdr_t *, int *, in6_addr_t *);
1136 extern void	sctp_process_err(sctp_t *);
1137 extern void	sctp_process_heartbeat(sctp_t *, sctp_chunk_hdr_t *);
1138 extern void	sctp_process_sendq(sctp_t *);
1139 extern void	sctp_process_timer(sctp_t *);
1140 
1141 extern void	sctp_redo_faddr_srcs(sctp_t *);
1142 extern void	sctp_regift_xmitlist(sctp_t *);
1143 extern void	sctp_return_heartbeat(sctp_t *, sctp_chunk_hdr_t *, mblk_t *);
1144 extern void	sctp_rexmit(sctp_t *, sctp_faddr_t *);
1145 extern mblk_t	*sctp_rexmit_packet(sctp_t *, mblk_t **, mblk_t **,
1146 		    sctp_faddr_t *, uint_t *);
1147 extern void	sctp_rexmit_timer(sctp_t *, sctp_faddr_t *);
1148 extern sctp_faddr_t *sctp_rotate_faddr(sctp_t *, sctp_faddr_t *);
1149 
1150 extern boolean_t sctp_sack(sctp_t *, mblk_t *);
1151 extern int	sctp_secure_restart_check(mblk_t *, sctp_chunk_hdr_t *,
1152 		    uint32_t, int, sctp_stack_t *);
1153 extern void	sctp_send_abort(sctp_t *, uint32_t, uint16_t, char *, size_t,
1154 		    mblk_t *, int, boolean_t);
1155 extern void	sctp_send_cookie_ack(sctp_t *);
1156 extern void	sctp_send_cookie_echo(sctp_t *, sctp_chunk_hdr_t *, mblk_t *);
1157 extern void	sctp_send_initack(sctp_t *, sctp_hdr_t *, sctp_chunk_hdr_t *,
1158 		    mblk_t *);
1159 extern void	sctp_send_shutdown(sctp_t *, int);
1160 extern void	sctp_send_heartbeat(sctp_t *, sctp_faddr_t *);
1161 extern void	sctp_sendfail_event(sctp_t *, mblk_t *, int, boolean_t);
1162 extern void	sctp_set_faddr_current(sctp_t *, sctp_faddr_t *);
1163 extern int	sctp_set_hdraddrs(sctp_t *);
1164 extern void	sctp_set_saddr(sctp_t *, sctp_faddr_t *);
1165 extern void	sctp_sets_init(void);
1166 extern void	sctp_sets_fini(void);
1167 extern void	sctp_shutdown_event(sctp_t *);
1168 extern void	sctp_stop_faddr_timers(sctp_t *);
1169 extern int	sctp_shutdown_received(sctp_t *, sctp_chunk_hdr_t *, boolean_t,
1170 		    boolean_t, sctp_faddr_t *);
1171 extern void	sctp_shutdown_complete(sctp_t *);
1172 extern void	sctp_set_if_mtu(sctp_t *);
1173 extern void	sctp_set_iplen(sctp_t *, mblk_t *);
1174 extern void	sctp_set_ulp_prop(sctp_t *);
1175 extern void	sctp_ss_rexmit(sctp_t *);
1176 extern size_t	sctp_supaddr_param_len(sctp_t *);
1177 extern size_t	sctp_supaddr_param(sctp_t *, uchar_t *);
1178 
1179 extern void	sctp_timer(sctp_t *, mblk_t *, clock_t);
1180 extern mblk_t	*sctp_timer_alloc(sctp_t *, pfv_t, int);
1181 extern void	sctp_timer_call(sctp_t *sctp, mblk_t *);
1182 extern void	sctp_timer_free(mblk_t *);
1183 extern void	sctp_timer_stop(mblk_t *);
1184 extern void	sctp_unlink_faddr(sctp_t *, sctp_faddr_t *);
1185 
1186 extern void	sctp_update_ire(sctp_t *sctp);
1187 extern in_port_t sctp_update_next_port(in_port_t, zone_t *zone, sctp_stack_t *);
1188 extern void	sctp_update_rtt(sctp_t *, sctp_faddr_t *, clock_t);
1189 extern void	sctp_user_abort(sctp_t *, mblk_t *);
1190 
1191 extern void	sctp_validate_peer(sctp_t *);
1192 
1193 extern void	sctp_wput_ioctl(queue_t *, mblk_t *);
1194 
1195 extern int	sctp_xmit_list_clean(sctp_t *, ssize_t);
1196 
1197 extern void	sctp_zap_addrs(sctp_t *);
1198 extern void	sctp_zap_faddrs(sctp_t *, int);
1199 
1200 /* Contract private interface between SCTP and Clustering - PSARC/2005/602 */
1201 
1202 extern void	(*cl_sctp_listen)(sa_family_t, uchar_t *, uint_t, in_port_t);
1203 extern void	(*cl_sctp_unlisten)(sa_family_t, uchar_t *, uint_t, in_port_t);
1204 extern void 	(*cl_sctp_connect)(sa_family_t, uchar_t *, uint_t, in_port_t,
1205 		    uchar_t *, uint_t, in_port_t, boolean_t, cl_sctp_handle_t);
1206 extern void	(*cl_sctp_disconnect)(sa_family_t, cl_sctp_handle_t);
1207 extern void	(*cl_sctp_assoc_change)(sa_family_t, uchar_t *, size_t, uint_t,
1208 		    uchar_t *, size_t, uint_t, int, cl_sctp_handle_t);
1209 extern void	(*cl_sctp_check_addrs)(sa_family_t, in_port_t, uchar_t **,
1210 		    size_t, uint_t *, boolean_t);
1211 
1212 /* Send a mp to IP. */
1213 #define	IP_PUT(mp, conn, isv4)						\
1214 {									\
1215 	sctp_stack_t	*sctps = conn->conn_netstack->netstack_sctp;	\
1216 									\
1217 	if ((isv4))							\
1218 		ip_output((conn), (mp), WR(sctps->sctps_g_q), IP_WPUT);	\
1219 	else								\
1220 		ip_output_v6((conn), (mp), WR(sctps->sctps_g_q), IP_WPUT);\
1221 }
1222 
1223 #define	RUN_SCTP(sctp)						\
1224 {								\
1225 	mutex_enter(&(sctp)->sctp_lock);			\
1226 	while ((sctp)->sctp_running)				\
1227 		cv_wait(&(sctp)->sctp_cv, &(sctp)->sctp_lock);	\
1228 	(sctp)->sctp_running = B_TRUE;				\
1229 	mutex_exit(&(sctp)->sctp_lock);				\
1230 }
1231 
1232 /* Wake up recvq taskq */
1233 #define	WAKE_SCTP(sctp)				\
1234 {						\
1235 	mutex_enter(&(sctp)->sctp_lock);	\
1236 	if ((sctp)->sctp_timer_mp != NULL)	\
1237 		sctp_process_timer(sctp);	\
1238 	(sctp)->sctp_running = B_FALSE;		\
1239 	cv_broadcast(&(sctp)->sctp_cv);		\
1240 	mutex_exit(&(sctp)->sctp_lock);		\
1241 }
1242 
1243 #ifdef	__cplusplus
1244 }
1245 #endif
1246 
1247 #endif	/* _INET_SCTP_SCTP_IMPL_H */
1248