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