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 * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, Joyent, Inc. All rights reserved.
24 * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2014, 2017 by Delphix. All rights reserved.
26 * Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
27 */
28 /* Copyright (c) 1990 Mentat Inc. */
29
30 #ifndef _INET_TCP_H
31 #define _INET_TCP_H
32
33 #ifdef __cplusplus
34 extern "C" {
35 #endif
36
37 #include <sys/inttypes.h>
38 #include <netinet/ip6.h>
39 #include <netinet/tcp.h>
40 #include <sys/socket.h>
41 #include <sys/socket_proto.h>
42 #include <sys/md5.h>
43 #include <inet/common.h>
44 #include <inet/ip.h>
45 #include <inet/ip6.h>
46 #include <inet/mi.h>
47 #include <inet/mib2.h>
48 #include <inet/tcp_stack.h>
49 #include <inet/tcp_sack.h>
50 #include <inet/cc.h>
51
52 /* TCP states */
53 #define TCPS_CLOSED -6
54 #define TCPS_IDLE -5 /* idle (opened, but not bound) */
55 #define TCPS_BOUND -4 /* bound, ready to connect or accept */
56 #define TCPS_LISTEN -3 /* listening for connection */
57 #define TCPS_SYN_SENT -2 /* active, have sent syn */
58 #define TCPS_SYN_RCVD -1 /* have received syn (and sent ours) */
59 /* states < TCPS_ESTABLISHED are those where connections not established */
60 #define TCPS_ESTABLISHED 0 /* established */
61 #define TCPS_CLOSE_WAIT 1 /* rcvd fin, waiting for close */
62 /* states > TCPS_CLOSE_WAIT are those where user has closed */
63 #define TCPS_FIN_WAIT_1 2 /* have closed and sent fin */
64 #define TCPS_CLOSING 3 /* closed, xchd FIN, await FIN ACK */
65 #define TCPS_LAST_ACK 4 /* had fin and close; await FIN ACK */
66 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
67 #define TCPS_FIN_WAIT_2 5 /* have closed, fin is acked */
68 #define TCPS_TIME_WAIT 6 /* in 2*msl quiet wait after close */
69
70 /*
71 * Internal flags used in conjunction with the packet header flags.
72 * Used in tcp_input_data to keep track of what needs to be done.
73 */
74 #define TH_LIMIT_XMIT 0x0400 /* Limited xmit is needed */
75 #define TH_XMIT_NEEDED 0x0800 /* Window opened - send queued data */
76 #define TH_REXMIT_NEEDED 0x1000 /* Time expired for unacked data */
77 #define TH_ACK_NEEDED 0x2000 /* Send an ack now. */
78 #define TH_NEED_SACK_REXMIT 0x4000 /* Use SACK info to retransmission */
79 #define TH_ACK_TIMER_NEEDED 0x8000 /* Start the delayed ACK timer */
80 #define TH_ORDREL_NEEDED 0x10000 /* Generate an ordrel indication */
81 #define TH_MARKNEXT_NEEDED 0x20000 /* Data should have MSGMARKNEXT */
82 #define TH_SEND_URP_MARK 0x40000 /* Send up tcp_urp_mark_mp */
83
84 /*
85 * TCP sequence numbers are 32 bit integers operated
86 * on with modular arithmetic. These macros can be
87 * used to compare such integers.
88 */
89 #define SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0)
90 #define SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0)
91 #define SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0)
92 #define SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0)
93
94 /* TCP Protocol header */
95 typedef struct tcphdr_s {
96 uint8_t th_lport[2]; /* Source port */
97 uint8_t th_fport[2]; /* Destination port */
98 uint8_t th_seq[4]; /* Sequence number */
99 uint8_t th_ack[4]; /* Acknowledgement number */
100 uint8_t th_offset_and_rsrvd[1]; /* Offset to the packet data */
101 uint8_t th_flags[1];
102 uint8_t th_win[2]; /* Allocation number */
103 uint8_t th_sum[2]; /* TCP checksum */
104 uint8_t th_urp[2]; /* Urgent pointer */
105 } tcph_t;
106
107 #define TCP_HDR_LENGTH(tcph) \
108 ((((tcph_t *)tcph)->th_offset_and_rsrvd[0] >>2) &(0xF << 2))
109 #define TCP_MAX_COMBINED_HEADER_LENGTH (60 + 60) /* Maxed out ip + tcp */
110 #define TCP_MAX_IP_OPTIONS_LENGTH (60 - IP_SIMPLE_HDR_LENGTH)
111 #define TCP_MAX_HDR_LENGTH 60
112 #define TCP_MAX_TCP_OPTIONS_LENGTH (60 - sizeof (tcpha_t))
113 #define TCP_MIN_HEADER_LENGTH 20
114 #define TCP_MAXWIN 65535
115 #define TCP_PORT_LEN sizeof (in_port_t)
116 #define TCP_MAX_WINSHIFT 14
117 #define TCP_MAX_LARGEWIN (TCP_MAXWIN << TCP_MAX_WINSHIFT)
118 #define TCP_MAX_LSO_LENGTH (IP_MAXPACKET - TCP_MAX_COMBINED_HEADER_LENGTH)
119
120 #define TCPIP_HDR_LENGTH(mp, n) \
121 (n) = IPH_HDR_LENGTH((mp)->b_rptr), \
122 (n) += TCP_HDR_LENGTH((tcpha_t *)&(mp)->b_rptr[(n)])
123
124 /* TCP Protocol header (used if the header is known to be 32-bit aligned) */
125 typedef struct tcphdra_s {
126 in_port_t tha_lport; /* Source port */
127 in_port_t tha_fport; /* Destination port */
128 uint32_t tha_seq; /* Sequence number */
129 uint32_t tha_ack; /* Acknowledgement number */
130 uint8_t tha_offset_and_reserved; /* Offset to the packet data */
131 uint8_t tha_flags;
132 uint16_t tha_win; /* Allocation number */
133 uint16_t tha_sum; /* TCP checksum */
134 uint16_t tha_urp; /* Urgent pointer */
135 } tcpha_t;
136
137 struct conn_s;
138 struct tcp_listen_cnt_s;
139
140 /*
141 * Control structure for each open TCP stream,
142 * defined only within the kernel or for a kmem user.
143 * NOTE: tcp_reinit_values MUST have a line for each field in this structure!
144 */
145 #if (defined(_KERNEL) || defined(_KMEMUSER))
146
147 typedef struct tcp_s {
148 struct tcp_s *tcp_time_wait_next;
149 /* Pointer to next T/W block */
150 struct tcp_s *tcp_time_wait_prev;
151 /* Pointer to previous T/W next */
152 int64_t tcp_time_wait_expire;
153
154 struct conn_s *tcp_connp; /* back pointer to conn_t */
155 tcp_stack_t *tcp_tcps; /* back pointer to tcp_stack_t */
156
157 struct cc_algo *tcp_cc_algo; /* congestion control algorithm */
158 struct cc_var tcp_ccv; /* congestion control specific vars */
159
160 int32_t tcp_state;
161 int32_t tcp_rcv_ws; /* My window scale power */
162 int32_t tcp_snd_ws; /* Sender's window scale power */
163 uint32_t tcp_ts_recent; /* Timestamp of earliest unacked */
164 /* data segment */
165 clock_t tcp_rto; /* Round trip timeout */
166 int64_t tcp_last_rcv_lbolt;
167 /* lbolt on last packet, used for PAWS */
168 uint32_t tcp_rto_initial; /* Initial RTO */
169 uint32_t tcp_rto_min; /* Minimum RTO */
170 uint32_t tcp_rto_max; /* Maximum RTO */
171
172 uint32_t tcp_snxt; /* Senders next seq num */
173 uint32_t tcp_swnd; /* Senders window (relative to suna) */
174 uint32_t tcp_mss; /* Max segment size */
175 uint32_t tcp_iss; /* Initial send seq num */
176 uint32_t tcp_rnxt; /* Seq we expect to recv next */
177 uint32_t tcp_rwnd;
178
179 /* Fields arranged in approximate access order along main paths */
180 mblk_t *tcp_xmit_head; /* Head of xmit/rexmit list */
181 mblk_t *tcp_xmit_last; /* Last valid data seen by tcp_wput */
182 mblk_t *tcp_xmit_tail; /* Last data sent */
183 uint32_t tcp_unsent; /* # of bytes in hand that are unsent */
184 uint32_t tcp_xmit_tail_unsent; /* # of unsent bytes in xmit_tail */
185 uint32_t tcp_suna; /* Sender unacknowledged */
186 uint32_t tcp_rexmit_nxt; /* Next rexmit seq num */
187 uint32_t tcp_rexmit_max; /* Max retran seq num */
188 uint32_t tcp_cwnd; /* Congestion window */
189 int32_t tcp_cwnd_cnt; /* cwnd cnt in congestion avoidance */
190 uint32_t tcp_naglim; /* Tunable nagle limit */
191 uint32_t tcp_valid_bits;
192 #define TCP_ISS_VALID 0x1 /* Is the tcp_iss seq num active? */
193 #define TCP_FSS_VALID 0x2 /* Is the tcp_fss seq num active? */
194 #define TCP_URG_VALID 0x4 /* Is the tcp_urg seq num active? */
195 #define TCP_OFO_FIN_VALID 0x8 /* Has TCP received an out of order FIN? */
196
197 timeout_id_t tcp_timer_tid; /* Control block for timer service */
198 uchar_t tcp_timer_backoff; /* Backoff shift count. */
199 int64_t tcp_last_recv_time; /* Last time we receive a segment. */
200 uint32_t tcp_init_cwnd; /* Initial cwnd (start/restart) */
201
202 /* Following manipulated by TCP under squeue protection */
203 uint32_t
204 tcp_urp_last_valid : 1, /* Is tcp_urp_last valid? */
205 tcp_hard_binding : 1, /* TCP_DETACHED_NONEAGER */
206 tcp_fin_acked : 1, /* Has our FIN been acked? */
207 tcp_fin_rcvd : 1, /* Have we seen a FIN? */
208
209 tcp_fin_sent : 1, /* Have we sent our FIN yet? */
210 tcp_ordrel_done : 1, /* Have we sent the ord_rel upstream? */
211 tcp_detached : 1, /* If we're detached from a stream */
212 tcp_zero_win_probe: 1, /* Zero win probing is in progress */
213
214 tcp_loopback: 1, /* src and dst are the same machine */
215 tcp_localnet: 1, /* src and dst are on the same subnet */
216 tcp_syn_defense: 1, /* For defense against SYN attack */
217 #define tcp_dontdrop tcp_syn_defense
218 tcp_set_timer : 1,
219
220 tcp_active_open: 1, /* This is a active open */
221 tcp_rexmit : 1, /* TCP is retransmitting */
222 tcp_snd_sack_ok : 1, /* Can use SACK for this connection */
223 tcp_hwcksum : 1, /* The NIC is capable of hwcksum */
224
225 tcp_ip_forward_progress : 1,
226 tcp_ecn_ok : 1, /* Can use ECN for this connection */
227 tcp_ecn_echo_on : 1, /* Need to do ECN echo */
228 tcp_ecn_cwr_sent : 1, /* ECN_CWR has been sent */
229
230 tcp_cwr : 1, /* Cwnd has reduced recently */
231
232 tcp_pad_to_bit31 : 11;
233
234 /* Following manipulated by TCP under squeue protection */
235 uint32_t
236 tcp_snd_ts_ok : 1,
237 tcp_snd_ws_ok : 1,
238 tcp_reserved_port : 1,
239 tcp_in_free_list : 1,
240
241 tcp_snd_zcopy_on : 1, /* xmit zero-copy enabled */
242 tcp_snd_zcopy_aware : 1, /* client is zero-copy aware */
243 tcp_xmit_zc_clean : 1, /* the xmit list is free of zc-mblk */
244 tcp_wait_for_eagers : 1, /* Wait for eagers to disappear */
245
246 tcp_accept_error : 1, /* Error during TLI accept */
247 tcp_send_discon_ind : 1, /* TLI accept err, send discon ind */
248 tcp_cork : 1, /* tcp_cork option */
249 tcp_tconnind_started : 1, /* conn_ind message is being sent */
250
251 tcp_lso :1, /* Lower layer is capable of LSO */
252 tcp_is_wnd_shrnk : 1, /* Window has shrunk */
253
254 tcp_pad_to_bit_31 : 18;
255
256 uint32_t tcp_initial_pmtu; /* Initial outgoing Path MTU. */
257
258 mblk_t *tcp_reass_head; /* Out of order reassembly list head */
259 mblk_t *tcp_reass_tail; /* Out of order reassembly list tail */
260
261 /* SACK related info */
262 tcp_sack_info_t tcp_sack_info;
263
264 #define tcp_pipe tcp_sack_info.tcp_pipe
265 #define tcp_fack tcp_sack_info.tcp_fack
266 #define tcp_sack_snxt tcp_sack_info.tcp_sack_snxt
267 #define tcp_max_sack_blk tcp_sack_info.tcp_max_sack_blk
268 #define tcp_num_sack_blk tcp_sack_info.tcp_num_sack_blk
269 #define tcp_sack_list tcp_sack_info.tcp_sack_list
270 #define tcp_num_notsack_blk tcp_sack_info.tcp_num_notsack_blk
271 #define tcp_cnt_notsack_list tcp_sack_info.tcp_cnt_notsack_list
272 #define tcp_notsack_list tcp_sack_info.tcp_notsack_list
273
274 mblk_t *tcp_rcv_list; /* Queued until push, urgent data, */
275 mblk_t *tcp_rcv_last_head; /* optdata, or the count exceeds */
276 mblk_t *tcp_rcv_last_tail; /* tcp_rcv_push_wait. */
277 uint32_t tcp_rcv_cnt; /* tcp_rcv_list is b_next chain. */
278
279 uint32_t tcp_cwnd_ssthresh; /* Congestion window */
280 uint32_t tcp_cwnd_max;
281 uint32_t tcp_csuna; /* Clear (no rexmits in window) suna */
282
283 hrtime_t tcp_rtt_sum; /* Round trip sum */
284 uint32_t tcp_rtt_cnt; /* Round trip count (non_dup ACKs) */
285 hrtime_t tcp_rtt_sa; /* Round trip smoothed average */
286 hrtime_t tcp_rtt_sd; /* Round trip smoothed deviation */
287 uint32_t tcp_rtt_update; /* Round trip update(s) */
288 clock_t tcp_ms_we_have_waited; /* Total retrans time */
289
290 uint32_t tcp_swl1; /* These help us avoid using stale */
291 uint32_t tcp_swl2; /* packets to update state */
292
293 uint32_t tcp_rack; /* Seq # we have acked */
294 uint32_t tcp_rack_cnt; /* # of segs we have deferred ack */
295 uint32_t tcp_rack_cur_max; /* # of segs we may defer ack for now */
296 uint32_t tcp_rack_abs_max; /* # of segs we may defer ack ever */
297 timeout_id_t tcp_ack_tid; /* Delayed ACK timer ID */
298 timeout_id_t tcp_push_tid; /* Push timer ID */
299
300 uint32_t tcp_max_swnd; /* Maximum swnd we have seen */
301
302 struct tcp_s *tcp_listener; /* Our listener */
303
304 uint32_t tcp_irs; /* Initial recv seq num */
305 uint32_t tcp_fss; /* Final/fin send seq num */
306 uint32_t tcp_urg; /* Urgent data seq num */
307
308 clock_t tcp_first_timer_threshold; /* When to prod IP */
309 clock_t tcp_second_timer_threshold; /* When to give up completely */
310 clock_t tcp_first_ctimer_threshold; /* 1st threshold while connecting */
311 clock_t tcp_second_ctimer_threshold; /* 2nd ... while connecting */
312
313 uint32_t tcp_urp_last; /* Last urp for which signal sent */
314 mblk_t *tcp_urp_mp; /* T_EXDATA_IND for urgent byte */
315 mblk_t *tcp_urp_mark_mp; /* zero-length marked/unmarked msg */
316
317 int tcp_conn_req_cnt_q0; /* # of conn reqs in SYN_RCVD */
318 int tcp_conn_req_cnt_q; /* # of conn reqs in ESTABLISHED */
319 int tcp_conn_req_max; /* # of ESTABLISHED conn reqs allowed */
320 t_scalar_t tcp_conn_req_seqnum; /* Incrementing pending conn req ID */
321 #define tcp_ip_addr_cache tcp_reass_tail
322 /* Cache ip addresses that */
323 /* complete the 3-way handshake */
324 kmutex_t tcp_eager_lock;
325 struct tcp_s *tcp_eager_next_q; /* next eager in ESTABLISHED state */
326 struct tcp_s *tcp_eager_last_q; /* last eager in ESTABLISHED state */
327 struct tcp_s *tcp_eager_next_q0; /* next eager in SYN_RCVD state */
328 struct tcp_s *tcp_eager_prev_q0; /* prev eager in SYN_RCVD state */
329 /* all eagers form a circular list */
330 boolean_t tcp_conn_def_q0; /* move from q0 to q deferred */
331
332 union {
333 mblk_t *tcp_eager_conn_ind; /* T_CONN_IND waiting for 3rd ack. */
334 mblk_t *tcp_opts_conn_req; /* T_CONN_REQ w/ options processed */
335 } tcp_conn;
336 uint32_t tcp_syn_rcvd_timeout; /* How many SYN_RCVD timeout in q0 */
337
338 /*
339 * TCP Keepalive Timer members.
340 * All keepalive timer intervals are in milliseconds.
341 */
342 int32_t tcp_ka_last_intrvl; /* Last probe interval */
343 timeout_id_t tcp_ka_tid; /* Keepalive timer ID */
344 uint32_t tcp_ka_interval; /* Keepalive interval */
345
346 /*
347 * TCP connection is terminated if we don't hear back from the peer
348 * for tcp_ka_abort_thres milliseconds after the first keepalive probe.
349 * tcp_ka_rinterval is the interval in milliseconds between successive
350 * keepalive probes. tcp_ka_cnt is the number of keepalive probes to
351 * be sent before terminating the connection, if we don't hear back from
352 * peer.
353 * tcp_ka_abort_thres = tcp_ka_rinterval * tcp_ka_cnt
354 */
355 uint32_t tcp_ka_rinterval; /* keepalive retransmit interval */
356 uint32_t tcp_ka_abort_thres; /* Keepalive abort threshold */
357 uint32_t tcp_ka_cnt; /* count of keepalive probes */
358
359 int32_t tcp_client_errno; /* How the client screwed up */
360
361 /*
362 * The header template lives in conn_ht_iphc allocated by tcp_build_hdrs
363 * We maintain three pointers into conn_ht_iphc.
364 */
365 ipha_t *tcp_ipha; /* IPv4 header in conn_ht_iphc */
366 ip6_t *tcp_ip6h; /* IPv6 header in conn_ht_iphc */
367 tcpha_t *tcp_tcpha; /* TCP header in conn_ht_iphc */
368
369 uint16_t tcp_last_sent_len; /* Record length for nagle */
370 uint16_t tcp_last_recv_len; /* Used by DTrace */
371 uint16_t tcp_dupack_cnt; /* # of consequtive duplicate acks */
372
373 kmutex_t *tcp_acceptor_lockp; /* Ptr to tf_lock */
374
375 mblk_t *tcp_ordrel_mp; /* T_ordrel_ind mblk */
376 t_uscalar_t tcp_acceptor_id; /* ACCEPTOR_id */
377
378 int tcp_ipsec_overhead;
379
380 uint_t tcp_recvtos; /* Last received IP_RECVTOS */
381 uint_t tcp_recvifindex; /* Last received IPV6_RCVPKTINFO */
382 uint_t tcp_recvhops; /* Last received IPV6_RECVHOPLIMIT */
383 uint_t tcp_recvtclass; /* Last received IPV6_RECVTCLASS */
384 ip6_hbh_t *tcp_hopopts; /* Last received IPV6_RECVHOPOPTS */
385 ip6_dest_t *tcp_dstopts; /* Last received IPV6_RECVDSTOPTS */
386 ip6_dest_t *tcp_rthdrdstopts; /* Last recv IPV6_RECVRTHDRDSTOPTS */
387 ip6_rthdr_t *tcp_rthdr; /* Last received IPV6_RECVRTHDR */
388 uint_t tcp_hopoptslen;
389 uint_t tcp_dstoptslen;
390 uint_t tcp_rthdrdstoptslen;
391 uint_t tcp_rthdrlen;
392
393 mblk_t *tcp_timercache;
394
395 kmutex_t tcp_closelock;
396 kcondvar_t tcp_closecv;
397 uint8_t tcp_closed;
398 uint8_t tcp_closeflags;
399 mblk_t tcp_closemp;
400 timeout_id_t tcp_linger_tid; /* Linger timer ID */
401
402 struct tcp_s *tcp_acceptor_hash; /* Acceptor hash chain */
403 struct tcp_s **tcp_ptpahn; /* Pointer to previous accept hash next. */
404 struct tcp_s *tcp_bind_hash; /* Bind hash chain */
405 struct tcp_s *tcp_bind_hash_port; /* tcp_t's bound to the same lport */
406 struct tcp_s **tcp_ptpbhn;
407
408 uint_t tcp_maxpsz_multiplier;
409
410 uint32_t tcp_lso_max; /* maximum LSO payload */
411
412 uint32_t tcp_ofo_fin_seq; /* Recv out of order FIN seq num */
413 uint32_t tcp_cwr_snd_max;
414
415 struct tcp_s *tcp_saved_listener; /* saved value of listener */
416
417 uint32_t tcp_in_ack_unsent; /* ACK for unsent data cnt. */
418
419 /*
420 * All fusion-related fields are protected by squeue.
421 */
422 struct tcp_s *tcp_loopback_peer; /* peer tcp for loopback */
423 mblk_t *tcp_fused_sigurg_mp; /* M_PCSIG mblk for SIGURG */
424
425 uint32_t
426 tcp_fused : 1, /* loopback tcp in fusion mode */
427 tcp_unfusable : 1, /* fusion not allowed on endpoint */
428 tcp_fused_sigurg : 1, /* send SIGURG upon draining */
429
430 tcp_fuse_to_bit_31 : 29;
431
432 kmutex_t tcp_non_sq_lock;
433
434 /*
435 * This variable is accessed without any lock protection
436 * and therefore must not be declared as a bit field along
437 * with the rest which require such condition.
438 */
439 boolean_t tcp_issocket; /* this is a socket tcp */
440
441 /* protected by the tcp_non_sq_lock lock */
442 uint32_t tcp_squeue_bytes;
443
444 /*
445 * tcp_closemp_used is protected by listener's tcp_eager_lock
446 * when used for eagers. When used for a tcp in TIME_WAIT state
447 * or in tcp_close(), it is not protected by any lock as we
448 * do not expect any other thread to use it concurrently.
449 * We do allow re-use of tcp_closemp in tcp_time_wait_collector()
450 * and tcp_close() but not concurrently.
451 */
452 boolean_t tcp_closemp_used;
453
454 /*
455 * previous and next eagers in the list of droppable eagers. See
456 * the comments before MAKE_DROPPABLE(). These pointers are
457 * protected by listener's tcp_eager_lock.
458 */
459 struct tcp_s *tcp_eager_prev_drop_q0;
460 struct tcp_s *tcp_eager_next_drop_q0;
461
462 /*
463 * Have we flow controlled xmitter?
464 * This variable can be modified outside the squeue and hence must
465 * not be declared as a bit field along with the rest that are
466 * modified only within the squeue.
467 * protected by the tcp_non_sq_lock lock.
468 */
469 boolean_t tcp_flow_stopped;
470
471 /*
472 * Sender's next sequence number at the time the window was shrunk.
473 */
474 uint32_t tcp_snxt_shrunk;
475
476 /*
477 * Socket generation number which is bumped when a connection attempt
478 * is initiated. Its main purpose is to ensure that the socket does not
479 * miss the asynchronous connected/disconnected notification.
480 */
481 sock_connid_t tcp_connid;
482
483 /* mblk_t used to enter TCP's squeue from the service routine. */
484 mblk_t *tcp_rsrv_mp;
485 /* Mutex for accessing tcp_rsrv_mp */
486 kmutex_t tcp_rsrv_mp_lock;
487
488 /* For connection counting. */
489 struct tcp_listen_cnt_s *tcp_listen_cnt;
490
491 /* Segment reassembly timer. */
492 timeout_id_t tcp_reass_tid;
493
494 /* FIN-WAIT-2 flush timeout */
495 uint32_t tcp_fin_wait_2_flush_interval;
496
497 tcp_conn_stats_t tcp_cs;
498
499 #ifdef DEBUG
500 pc_t tcmp_stk[15];
501 #endif
502 } tcp_t;
503
504 #ifdef DEBUG
505 #define TCP_DEBUG_GETPCSTACK(buffer, depth) ((void) getpcstack(buffer, \
506 depth))
507 #else
508 #define TCP_DEBUG_GETPCSTACK(buffer, depth)
509 #endif
510
511 extern void tcp_conn_reclaim(void *);
512 extern void tcp_free(tcp_t *tcp);
513 extern void tcp_ddi_g_init(void);
514 extern void tcp_ddi_g_destroy(void);
515 extern conn_t *tcp_get_conn(void *arg, tcp_stack_t *);
516 extern mblk_t *tcp_snmp_get(queue_t *, mblk_t *, boolean_t);
517 extern int tcp_snmp_set(queue_t *, int, int, uchar_t *, int len);
518
519 /* Pad for the tf_t structure to avoid false cache line sharing. */
520 #define TF_CACHEL_PAD 64
521
522 /*
523 * The TCP Fanout structure for bind and acceptor hashes.
524 * The hash tables and their linkage (tcp_*_hash, tcp_ptp*hn) are
525 * protected by the per-bucket tf_lock. Each tcp_t
526 * inserted in the list points back at this lock using tcp_*_lockp.
527 *
528 * The bind and acceptor hash queues are lists of tcp_t.
529 */
530 /* listener hash and acceptor hash queue head */
531 typedef struct tf_s {
532 tcp_t *tf_tcp;
533 kmutex_t tf_lock;
534 unsigned char tf_pad[TF_CACHEL_PAD -
535 (sizeof (tcp_t *) + sizeof (kmutex_t))];
536 } tf_t;
537
538
539 /* Also used in ipclassifier.c */
540 extern struct kmem_cache *tcp_sack_info_cache;
541
542 #endif /* (defined(_KERNEL) || defined(_KMEMUSER)) */
543
544 /* Contract private interface between TCP and Clustering. */
545
546 #define CL_TCPI_V1 1 /* cl_tcpi_version number */
547
548 typedef struct cl_tcp_info_s {
549 ushort_t cl_tcpi_version; /* cl_tcp_info_t's version no */
550 ushort_t cl_tcpi_ipversion; /* IP version */
551 int32_t cl_tcpi_state; /* TCP state */
552 in_port_t cl_tcpi_lport; /* Local port */
553 in_port_t cl_tcpi_fport; /* Remote port */
554 in6_addr_t cl_tcpi_laddr_v6; /* Local IP address */
555 in6_addr_t cl_tcpi_faddr_v6; /* Remote IP address */
556 #ifdef _KERNEL
557 /* Note: V4_PART_OF_V6 is meant to be used only for _KERNEL defined stuff */
558 #define cl_tcpi_laddr V4_PART_OF_V6(cl_tcpi_laddr_v6)
559 #define cl_tcpi_faddr V4_PART_OF_V6(cl_tcpi_faddr_v6)
560
561 #endif /* _KERNEL */
562 } cl_tcp_info_t;
563
564 /*
565 * Hook functions to enable cluster networking
566 * On non-clustered systems these vectors must always be NULL.
567 */
568 extern void (*cl_inet_listen)(netstackid_t, uint8_t, sa_family_t,
569 uint8_t *, in_port_t, void *);
570 extern void (*cl_inet_unlisten)(netstackid_t, uint8_t, sa_family_t,
571 uint8_t *, in_port_t, void *);
572
573 /*
574 * Contracted Consolidation Private ioctl for aborting TCP connections.
575 * In order to keep the offsets and size of the structure the same between
576 * a 32-bit application and a 64-bit amd64 kernel, we use a #pragma
577 * pack(4).
578 */
579 #define TCP_IOC_ABORT_CONN (('T' << 8) + 91)
580
581 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
582 #pragma pack(4)
583 #endif
584
585 typedef struct tcp_ioc_abort_conn_s {
586 struct sockaddr_storage ac_local; /* local addr and port */
587 struct sockaddr_storage ac_remote; /* remote addr and port */
588 int32_t ac_start; /* start state */
589 int32_t ac_end; /* end state */
590 int32_t ac_zoneid; /* zoneid */
591 } tcp_ioc_abort_conn_t;
592
593 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
594 #pragma pack()
595 #endif
596
597 #ifdef __cplusplus
598 }
599 #endif
600
601 #endif /* _INET_TCP_H */