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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 /* Copyright (c) 1990 Mentat Inc. */ 26 27 #ifndef _INET_TCP_H 28 #define _INET_TCP_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 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/multidata.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/kssl/ksslapi.h> 50 51 /* 52 * Private (and possibly temporary) ioctl used by configuration code 53 * to lock in the "default" stream for detached closes. 54 */ 55 #define TCP_IOC_DEFAULT_Q (('T' << 8) + 51) 56 57 /* TCP states */ 58 #define TCPS_CLOSED -6 59 #define TCPS_IDLE -5 /* idle (opened, but not bound) */ 60 #define TCPS_BOUND -4 /* bound, ready to connect or accept */ 61 #define TCPS_LISTEN -3 /* listening for connection */ 62 #define TCPS_SYN_SENT -2 /* active, have sent syn */ 63 #define TCPS_SYN_RCVD -1 /* have received syn (and sent ours) */ 64 /* states < TCPS_ESTABLISHED are those where connections not established */ 65 #define TCPS_ESTABLISHED 0 /* established */ 66 #define TCPS_CLOSE_WAIT 1 /* rcvd fin, waiting for close */ 67 /* states > TCPS_CLOSE_WAIT are those where user has closed */ 68 #define TCPS_FIN_WAIT_1 2 /* have closed and sent fin */ 69 #define TCPS_CLOSING 3 /* closed, xchd FIN, await FIN ACK */ 70 #define TCPS_LAST_ACK 4 /* had fin and close; await FIN ACK */ 71 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ 72 #define TCPS_FIN_WAIT_2 5 /* have closed, fin is acked */ 73 #define TCPS_TIME_WAIT 6 /* in 2*msl quiet wait after close */ 74 75 /* 76 * Internal flags used in conjunction with the packet header flags. 77 * Used in tcp_rput_data to keep track of what needs to be done. 78 */ 79 #define TH_LIMIT_XMIT 0x0400 /* Limited xmit is needed */ 80 #define TH_XMIT_NEEDED 0x0800 /* Window opened - send queued data */ 81 #define TH_REXMIT_NEEDED 0x1000 /* Time expired for unacked data */ 82 #define TH_ACK_NEEDED 0x2000 /* Send an ack now. */ 83 #define TH_NEED_SACK_REXMIT 0x4000 /* Use SACK info to retransmission */ 84 #define TH_ACK_TIMER_NEEDED 0x8000 /* Start the delayed ACK timer */ 85 #define TH_ORDREL_NEEDED 0x10000 /* Generate an ordrel indication */ 86 #define TH_MARKNEXT_NEEDED 0x20000 /* Data should have MSGMARKNEXT */ 87 #define TH_SEND_URP_MARK 0x40000 /* Send up tcp_urp_mark_mp */ 88 89 /* 90 * TCP sequence numbers are 32 bit integers operated 91 * on with modular arithmetic. These macros can be 92 * used to compare such integers. 93 */ 94 #define SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 95 #define SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 96 #define SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 97 #define SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 98 99 /* TCP Protocol header */ 100 typedef struct tcphdr_s { 101 uint8_t th_lport[2]; /* Source port */ 102 uint8_t th_fport[2]; /* Destination port */ 103 uint8_t th_seq[4]; /* Sequence number */ 104 uint8_t th_ack[4]; /* Acknowledgement number */ 105 uint8_t th_offset_and_rsrvd[1]; /* Offset to the packet data */ 106 uint8_t th_flags[1]; 107 uint8_t th_win[2]; /* Allocation number */ 108 uint8_t th_sum[2]; /* TCP checksum */ 109 uint8_t th_urp[2]; /* Urgent pointer */ 110 } tcph_t; 111 112 #define TCP_HDR_LENGTH(tcph) (((tcph)->th_offset_and_rsrvd[0] >>2) &(0xF << 2)) 113 #define TCP_MAX_COMBINED_HEADER_LENGTH (60 + 60) /* Maxed out ip + tcp */ 114 #define TCP_MAX_IP_OPTIONS_LENGTH (60 - IP_SIMPLE_HDR_LENGTH) 115 #define TCP_MAX_HDR_LENGTH 60 116 #define TCP_MAX_TCP_OPTIONS_LENGTH (60 - sizeof (tcph_t)) 117 #define TCP_MIN_HEADER_LENGTH 20 118 #define TCP_MAXWIN 65535 119 #define TCP_PORT_LEN sizeof (in_port_t) 120 #define TCP_MAX_WINSHIFT 14 121 #define TCP_MAX_LARGEWIN (TCP_MAXWIN << TCP_MAX_WINSHIFT) 122 #define TCP_MAX_LSO_LENGTH (IP_MAXPACKET - TCP_MAX_COMBINED_HEADER_LENGTH) 123 124 #define TCPIP_HDR_LENGTH(mp, n) \ 125 (n) = IPH_HDR_LENGTH((mp)->b_rptr), \ 126 (n) += TCP_HDR_LENGTH((tcph_t *)&(mp)->b_rptr[(n)]) 127 128 /* TCP Protocol header (used if the header is known to be 32-bit aligned) */ 129 typedef struct tcphdra_s { 130 in_port_t tha_lport; /* Source port */ 131 in_port_t tha_fport; /* Destination port */ 132 uint32_t tha_seq; /* Sequence number */ 133 uint32_t tha_ack; /* Acknowledgement number */ 134 uint8_t tha_offset_and_reserved; /* Offset to the packet data */ 135 uint8_t tha_flags; 136 uint16_t tha_win; /* Allocation number */ 137 uint16_t tha_sum; /* TCP checksum */ 138 uint16_t tha_urp; /* Urgent pointer */ 139 } tcpha_t; 140 141 struct conn_s; 142 143 /* 144 * Control structure for each open TCP stream, 145 * defined only within the kernel or for a kmem user. 146 * NOTE: tcp_reinit_values MUST have a line for each field in this structure! 147 */ 148 #if (defined(_KERNEL) || defined(_KMEMUSER)) 149 150 typedef struct tcp_s { 151 /* Pointer to previous bind hash next. */ 152 struct tcp_s *tcp_time_wait_next; 153 /* Pointer to next T/W block */ 154 struct tcp_s *tcp_time_wait_prev; 155 /* Pointer to previous T/W next */ 156 clock_t tcp_time_wait_expire; 157 158 struct conn_s *tcp_connp; 159 tcp_stack_t *tcp_tcps; /* Shortcut via conn_netstack */ 160 161 int32_t tcp_state; 162 int32_t tcp_rcv_ws; /* My window scale power */ 163 int32_t tcp_snd_ws; /* Sender's window scale power */ 164 uint32_t tcp_ts_recent; /* Timestamp of earliest unacked */ 165 /* data segment */ 166 clock_t tcp_rto; /* Round trip timeout */ 167 clock_t tcp_last_rcv_lbolt; 168 /* lbolt on last packet, used for PAWS */ 169 170 uint32_t tcp_snxt; /* Senders next seq num */ 171 uint32_t tcp_swnd; /* Senders window (relative to suna) */ 172 uint32_t tcp_mss; /* Max segment size */ 173 uint32_t tcp_iss; /* Initial send seq num */ 174 uint32_t tcp_rnxt; /* Seq we expect to recv next */ 175 uint32_t tcp_rwnd; 176 177 queue_t *tcp_rq; /* Our upstream neighbor (client) */ 178 queue_t *tcp_wq; /* Our downstream neighbor */ 179 180 /* Fields arranged in approximate access order along main paths */ 181 mblk_t *tcp_xmit_head; /* Head of rexmit list */ 182 mblk_t *tcp_xmit_last; /* last valid data seen by tcp_wput */ 183 mblk_t *tcp_xmit_tail; /* Last rexmit data sent */ 184 uint32_t tcp_unsent; /* # of bytes in hand that are unsent */ 185 uint32_t tcp_xmit_tail_unsent; /* # of unsent bytes in xmit_tail */ 186 187 uint32_t tcp_suna; /* Sender unacknowledged */ 188 uint32_t tcp_rexmit_nxt; /* Next rexmit seq num */ 189 uint32_t tcp_rexmit_max; /* Max retran seq num */ 190 int32_t tcp_snd_burst; /* Send burst factor */ 191 uint32_t tcp_cwnd; /* Congestion window */ 192 int32_t tcp_cwnd_cnt; /* cwnd cnt in congestion avoidance */ 193 194 uint32_t tcp_ibsegs; /* Inbound segments on this stream */ 195 uint32_t tcp_obsegs; /* Outbound segments on this stream */ 196 197 uint32_t tcp_naglim; /* Tunable nagle limit */ 198 uint32_t tcp_valid_bits; 199 #define TCP_ISS_VALID 0x1 /* Is the tcp_iss seq num active? */ 200 #define TCP_FSS_VALID 0x2 /* Is the tcp_fss seq num active? */ 201 #define TCP_URG_VALID 0x4 /* Is the tcp_urg seq num active? */ 202 #define TCP_OFO_FIN_VALID 0x8 /* Has TCP received an out of order FIN? */ 203 204 205 int32_t tcp_xmit_hiwater; /* Send buffer high water mark. */ 206 207 timeout_id_t tcp_timer_tid; /* Control block for timer service */ 208 uchar_t tcp_timer_backoff; /* Backoff shift count. */ 209 int64_t tcp_last_recv_time; /* Last time we receive a segment. */ 210 uint32_t tcp_init_cwnd; /* Initial cwnd (start/restart) */ 211 212 /* 213 * Following socket options are set by sockfs outside the squeue 214 * and we want to separate these bit fields from the other bit fields 215 * set by TCP to avoid grabbing locks. sockfs ensures that only one 216 * thread in sockfs can set a socket option at a time on a conn_t. 217 * However TCP may read these options concurrently. The linger option 218 * needs atomicity since tcp_lingertime also needs to be in sync. 219 * However TCP uses it only during close, and by then no socket option 220 * can come down. So we don't need any locks, instead just separating 221 * the sockfs settable bit fields from the other bit fields is 222 * sufficient. 223 */ 224 uint32_t 225 tcp_debug : 1, /* SO_DEBUG "socket" option. */ 226 tcp_dontroute : 1, /* SO_DONTROUTE "socket" option. */ 227 tcp_broadcast : 1, /* SO_BROADCAST "socket" option. */ 228 tcp_useloopback : 1, /* SO_USELOOPBACK "socket" option. */ 229 230 tcp_oobinline : 1, /* SO_OOBINLINE "socket" option. */ 231 tcp_dgram_errind : 1, /* SO_DGRAM_ERRIND option */ 232 tcp_linger : 1, /* SO_LINGER turned on */ 233 tcp_reuseaddr : 1, /* SO_REUSEADDR "socket" option. */ 234 235 tcp_junk_to_bit_31 : 24; 236 237 /* Following manipulated by TCP under squeue protection */ 238 uint32_t 239 tcp_urp_last_valid : 1, /* Is tcp_urp_last valid? */ 240 tcp_hard_binding : 1, /* If we've started a full bind */ 241 tcp_hard_bound : 1, /* If we've done a full bind with IP */ 242 tcp_fin_acked : 1, /* Has our FIN been acked? */ 243 244 tcp_fin_rcvd : 1, /* Have we seen a FIN? */ 245 tcp_fin_sent : 1, /* Have we sent our FIN yet? */ 246 tcp_ordrel_done : 1, /* Have we sent the ord_rel upstream? */ 247 tcp_detached : 1, /* If we're detached from a stream */ 248 249 tcp_bind_pending : 1, /* Client is waiting for bind ack */ 250 tcp_unbind_pending : 1, /* Client sent T_UNBIND_REQ */ 251 tcp_deferred_clean_death : 1, 252 /* defer tcp endpoint cleanup etc. */ 253 tcp_conn_def_q0: 1, /* move from q0 to q deferred */ 254 255 tcp_ka_enabled: 1, /* Connection KeepAlive Timer needed */ 256 tcp_zero_win_probe: 1, /* Zero win probing is in progress */ 257 tcp_loopback: 1, /* src and dst are the same machine */ 258 tcp_localnet: 1, /* src and dst are on the same subnet */ 259 260 tcp_syn_defense: 1, /* For defense against SYN attack */ 261 #define tcp_dontdrop tcp_syn_defense 262 tcp_set_timer : 1, 263 tcp_active_open: 1, /* This is a active open */ 264 tcp_timeout : 1, /* qbufcall failed, qtimeout pending */ 265 266 tcp_rexmit : 1, /* TCP is retransmitting */ 267 tcp_snd_sack_ok : 1, /* Can use SACK for this connection */ 268 tcp_empty_flag : 1, /* Empty flag for future use */ 269 tcp_recvdstaddr : 1, /* return T_EXTCONN_IND with dst addr */ 270 271 tcp_hwcksum : 1, /* The NIC is capable of hwcksum */ 272 tcp_ip_forward_progress : 1, 273 tcp_anon_priv_bind : 1, 274 tcp_ecn_ok : 1, /* Can use ECN for this connection */ 275 276 tcp_ecn_echo_on : 1, /* Need to do ECN echo */ 277 tcp_ecn_cwr_sent : 1, /* ECN_CWR has been sent */ 278 tcp_cwr : 1, /* Cwnd has reduced recently */ 279 tcp_pad_to_bit31 : 1; 280 /* Following manipulated by TCP under squeue protection */ 281 uint32_t 282 tcp_mdt : 1, /* Lower layer is capable of MDT */ 283 tcp_snd_ts_ok : 1, 284 tcp_snd_ws_ok : 1, 285 tcp_exclbind : 1, /* ``exclusive'' binding */ 286 287 tcp_reserved_port : 1, 288 tcp_hdr_grown : 1, 289 tcp_in_free_list : 1, 290 tcp_snd_zcopy_on : 1, /* xmit zero-copy enabled */ 291 292 tcp_snd_zcopy_aware : 1, /* client is zero-copy aware */ 293 tcp_xmit_zc_clean : 1, /* the xmit list is free of zc-mblk */ 294 tcp_wait_for_eagers : 1, /* Wait for eagers to disappear */ 295 tcp_accept_error : 1, /* Error during TLI accept */ 296 297 tcp_send_discon_ind : 1, /* TLI accept err, send discon ind */ 298 tcp_cork : 1, /* tcp_cork option */ 299 tcp_tconnind_started : 1, /* conn_ind message is being sent */ 300 tcp_lso :1, /* Lower layer is capable of LSO */ 301 tcp_pad_to_bit_31 : 16; 302 303 uint32_t tcp_if_mtu; /* Outgoing interface MTU. */ 304 305 mblk_t *tcp_reass_head; /* Out of order reassembly list head */ 306 mblk_t *tcp_reass_tail; /* Out of order reassembly list tail */ 307 308 tcp_sack_info_t *tcp_sack_info; 309 310 #define tcp_pipe tcp_sack_info->tcp_pipe 311 #define tcp_fack tcp_sack_info->tcp_fack 312 #define tcp_sack_snxt tcp_sack_info->tcp_sack_snxt 313 #define tcp_max_sack_blk tcp_sack_info->tcp_max_sack_blk 314 #define tcp_num_sack_blk tcp_sack_info->tcp_num_sack_blk 315 #define tcp_sack_list tcp_sack_info->tcp_sack_list 316 #define tcp_num_notsack_blk tcp_sack_info->tcp_num_notsack_blk 317 #define tcp_cnt_notsack_list tcp_sack_info->tcp_cnt_notsack_list 318 #define tcp_notsack_list tcp_sack_info->tcp_notsack_list 319 320 mblk_t *tcp_rcv_list; /* Queued until push, urgent data, */ 321 mblk_t *tcp_rcv_last_head; /* optdata, or the count exceeds */ 322 mblk_t *tcp_rcv_last_tail; /* tcp_rcv_push_wait. */ 323 uint32_t tcp_rcv_cnt; /* tcp_rcv_list is b_next chain. */ 324 325 uint32_t tcp_cwnd_ssthresh; /* Congestion window */ 326 uint32_t tcp_cwnd_max; 327 uint32_t tcp_csuna; /* Clear (no rexmits in window) suna */ 328 329 clock_t tcp_rtt_sa; /* Round trip smoothed average */ 330 clock_t tcp_rtt_sd; /* Round trip smoothed deviation */ 331 clock_t tcp_rtt_update; /* Round trip update(s) */ 332 clock_t tcp_ms_we_have_waited; /* Total retrans time */ 333 334 uint32_t tcp_swl1; /* These help us avoid using stale */ 335 uint32_t tcp_swl2; /* packets to update state */ 336 337 uint32_t tcp_rack; /* Seq # we have acked */ 338 uint32_t tcp_rack_cnt; /* # of segs we have deferred ack */ 339 uint32_t tcp_rack_cur_max; /* # of segs we may defer ack for now */ 340 uint32_t tcp_rack_abs_max; /* # of segs we may defer ack ever */ 341 timeout_id_t tcp_ack_tid; /* Delayed ACK timer ID */ 342 timeout_id_t tcp_push_tid; /* Push timer ID */ 343 344 uint32_t tcp_max_swnd; /* Maximum swnd we have seen */ 345 346 struct tcp_s *tcp_listener; /* Our listener */ 347 348 int32_t tcp_xmit_lowater; /* Send buffer low water mark. */ 349 350 uint32_t tcp_irs; /* Initial recv seq num */ 351 uint32_t tcp_fss; /* Final/fin send seq num */ 352 uint32_t tcp_urg; /* Urgent data seq num */ 353 354 clock_t tcp_first_timer_threshold; /* When to prod IP */ 355 clock_t tcp_second_timer_threshold; /* When to give up completely */ 356 clock_t tcp_first_ctimer_threshold; /* 1st threshold while connecting */ 357 clock_t tcp_second_ctimer_threshold; /* 2nd ... while connecting */ 358 359 int tcp_lingertime; /* Close linger time (in seconds) */ 360 361 uint32_t tcp_urp_last; /* Last urp for which signal sent */ 362 mblk_t *tcp_urp_mp; /* T_EXDATA_IND for urgent byte */ 363 mblk_t *tcp_urp_mark_mp; /* zero-length marked/unmarked msg */ 364 365 int tcp_conn_req_cnt_q0; /* # of conn reqs in SYN_RCVD */ 366 int tcp_conn_req_cnt_q; /* # of conn reqs in ESTABLISHED */ 367 int tcp_conn_req_max; /* # of ESTABLISHED conn reqs allowed */ 368 t_scalar_t tcp_conn_req_seqnum; /* Incrementing pending conn req ID */ 369 #define tcp_ip_addr_cache tcp_reass_tail 370 /* Cache ip addresses that */ 371 /* complete the 3-way handshake */ 372 kmutex_t tcp_eager_lock; 373 struct tcp_s *tcp_eager_next_q; /* next eager in ESTABLISHED state */ 374 struct tcp_s *tcp_eager_last_q; /* last eager in ESTABLISHED state */ 375 struct tcp_s *tcp_eager_next_q0; /* next eager in SYN_RCVD state */ 376 struct tcp_s *tcp_eager_prev_q0; /* prev eager in SYN_RCVD state */ 377 /* all eagers form a circular list */ 378 union { 379 mblk_t *tcp_eager_conn_ind; /* T_CONN_IND waiting for 3rd ack. */ 380 mblk_t *tcp_opts_conn_req; /* T_CONN_REQ w/ options processed */ 381 } tcp_conn; 382 uint32_t tcp_syn_rcvd_timeout; /* How many SYN_RCVD timeout in q0 */ 383 384 /* TCP Keepalive Timer members */ 385 int32_t tcp_ka_last_intrvl; /* Last probe interval */ 386 timeout_id_t tcp_ka_tid; /* Keepalive timer ID */ 387 uint32_t tcp_ka_interval; /* Keepalive interval */ 388 uint32_t tcp_ka_abort_thres; /* Keepalive abort threshold */ 389 390 int32_t tcp_client_errno; /* How the client screwed up */ 391 392 char *tcp_iphc; /* Buffer holding tcp/ip hdr template */ 393 int tcp_iphc_len; /* actual allocated buffer size */ 394 int32_t tcp_hdr_len; /* Byte len of combined TCP/IP hdr */ 395 ipha_t *tcp_ipha; /* IPv4 header in the buffer */ 396 ip6_t *tcp_ip6h; /* IPv6 header in the buffer */ 397 int tcp_ip_hdr_len; /* Byte len of our current IPvx hdr */ 398 tcph_t *tcp_tcph; /* tcp header within combined hdr */ 399 int32_t tcp_tcp_hdr_len; /* tcp header len within combined */ 400 401 uint32_t tcp_sum; /* checksum to compensate for source */ 402 /* routed packets. Host byte order */ 403 uint16_t tcp_last_sent_len; /* Record length for nagle */ 404 uint16_t tcp_dupack_cnt; /* # of consequtive duplicate acks */ 405 406 kmutex_t *tcp_acceptor_lockp; /* Ptr to tf_lock */ 407 408 timeout_id_t tcp_ordrelid; /* qbufcall/qtimeout id */ 409 t_uscalar_t tcp_acceptor_id; /* ACCEPTOR_id */ 410 411 int tcp_ipsec_overhead; 412 /* 413 * Address family that app wishes returned addrsses to be in. 414 * Currently taken from address family used in T_BIND_REQ, but 415 * should really come from family used in original socket() call. 416 * Value can be AF_INET or AF_INET6. 417 */ 418 uint_t tcp_family; 419 /* 420 * used for a quick test to determine if any ancillary bits are 421 * set 422 */ 423 uint_t tcp_ipv6_recvancillary; /* Flags */ 424 #define TCP_IPV6_RECVPKTINFO 0x01 /* IPV6_RECVPKTINFO option */ 425 #define TCP_IPV6_RECVHOPLIMIT 0x02 /* IPV6_RECVHOPLIMIT option */ 426 #define TCP_IPV6_RECVHOPOPTS 0x04 /* IPV6_RECVHOPOPTS option */ 427 #define TCP_IPV6_RECVDSTOPTS 0x08 /* IPV6_RECVDSTOPTS option */ 428 #define TCP_IPV6_RECVRTHDR 0x10 /* IPV6_RECVRTHDR option */ 429 #define TCP_IPV6_RECVRTDSTOPTS 0x20 /* IPV6_RECVRTHDRDSTOPTS option */ 430 #define TCP_IPV6_RECVTCLASS 0x40 /* IPV6_RECVTCLASS option */ 431 #define TCP_OLD_IPV6_RECVDSTOPTS 0x80 /* old IPV6_RECVDSTOPTS option */ 432 433 uint_t tcp_recvifindex; /* Last received IPV6_RCVPKTINFO */ 434 uint_t tcp_recvhops; /* Last received IPV6_RECVHOPLIMIT */ 435 uint_t tcp_recvtclass; /* Last received IPV6_RECVTCLASS */ 436 ip6_hbh_t *tcp_hopopts; /* Last received IPV6_RECVHOPOPTS */ 437 ip6_dest_t *tcp_dstopts; /* Last received IPV6_RECVDSTOPTS */ 438 ip6_dest_t *tcp_rtdstopts; /* Last recvd IPV6_RECVRTHDRDSTOPTS */ 439 ip6_rthdr_t *tcp_rthdr; /* Last received IPV6_RECVRTHDR */ 440 uint_t tcp_hopoptslen; 441 uint_t tcp_dstoptslen; 442 uint_t tcp_rtdstoptslen; 443 uint_t tcp_rthdrlen; 444 445 mblk_t *tcp_timercache; 446 cred_t *tcp_cred; /* Credentials when this was opened */ 447 pid_t tcp_cpid; /* Process id when this was opened */ 448 uint64_t tcp_open_time; /* time when this was opened */ 449 450 451 union { 452 struct { 453 uchar_t v4_ttl; 454 /* Dup of tcp_ipha.iph_type_of_service */ 455 uchar_t v4_tos; /* Dup of tcp_ipha.iph_ttl */ 456 } v4_hdr_info; 457 struct { 458 uint_t v6_vcf; /* Dup of tcp_ip6h.ip6h_vcf */ 459 uchar_t v6_hops; /* Dup of tcp_ip6h.ip6h_hops */ 460 } v6_hdr_info; 461 } tcp_hdr_info; 462 #define tcp_ttl tcp_hdr_info.v4_hdr_info.v4_ttl 463 #define tcp_tos tcp_hdr_info.v4_hdr_info.v4_tos 464 #define tcp_ip6_vcf tcp_hdr_info.v6_hdr_info.v6_vcf 465 #define tcp_ip6_hops tcp_hdr_info.v6_hdr_info.v6_hops 466 467 ushort_t tcp_ipversion; 468 uint_t tcp_bound_if; /* IPV6_BOUND_IF */ 469 470 #define tcp_lport tcp_connp->conn_lport 471 #define tcp_fport tcp_connp->conn_fport 472 #define tcp_ports tcp_connp->conn_ports 473 474 #define tcp_remote tcp_connp->conn_rem 475 #define tcp_ip_src tcp_connp->conn_src 476 477 #define tcp_remote_v6 tcp_connp->conn_remv6 478 #define tcp_ip_src_v6 tcp_connp->conn_srcv6 479 #define tcp_bound_source_v6 tcp_connp->conn_bound_source_v6 480 #define tcp_bound_source tcp_connp->conn_bound_source 481 482 kmutex_t tcp_closelock; 483 kcondvar_t tcp_closecv; 484 uint8_t tcp_closed; 485 uint8_t tcp_closeflags; 486 uint8_t tcp_cleandeathtag; 487 mblk_t tcp_closemp; 488 timeout_id_t tcp_linger_tid; /* Linger timer ID */ 489 void *tcp_tracebuf; 490 491 struct tcp_s *tcp_acceptor_hash; /* Acceptor hash chain */ 492 struct tcp_s **tcp_ptpahn; /* Pointer to previous accept hash next. */ 493 struct tcp_s *tcp_bind_hash; /* Bind hash chain */ 494 struct tcp_s **tcp_ptpbhn; 495 496 boolean_t tcp_ire_ill_check_done; 497 uint_t tcp_maxpsz; 498 499 /* 500 * used for Multidata Transmit 501 */ 502 uint_t tcp_mdt_hdr_head; /* leading header fragment extra space */ 503 uint_t tcp_mdt_hdr_tail; /* trailing header fragment extra space */ 504 int tcp_mdt_max_pld; /* maximum payload buffers per Multidata */ 505 506 uint32_t tcp_lso_max; /* maximum LSO payload */ 507 508 uint32_t tcp_ofo_fin_seq; /* Recv out of order FIN seq num */ 509 uint32_t tcp_cwr_snd_max; 510 uint_t tcp_drop_opt_ack_cnt; /* # tcp generated optmgmt */ 511 ip6_pkt_t tcp_sticky_ipp; /* Sticky options */ 512 #define tcp_ipp_fields tcp_sticky_ipp.ipp_fields /* valid fields */ 513 #define tcp_ipp_ifindex tcp_sticky_ipp.ipp_ifindex /* pktinfo ifindex */ 514 #define tcp_ipp_addr tcp_sticky_ipp.ipp_addr /* pktinfo src/dst addr */ 515 #define tcp_ipp_hoplimit tcp_sticky_ipp.ipp_hoplimit 516 #define tcp_ipp_hopoptslen tcp_sticky_ipp.ipp_hopoptslen 517 #define tcp_ipp_rtdstoptslen tcp_sticky_ipp.ipp_rtdstoptslen 518 #define tcp_ipp_rthdrlen tcp_sticky_ipp.ipp_rthdrlen 519 #define tcp_ipp_dstoptslen tcp_sticky_ipp.ipp_dstoptslen 520 #define tcp_ipp_hopopts tcp_sticky_ipp.ipp_hopopts 521 #define tcp_ipp_rtdstopts tcp_sticky_ipp.ipp_rtdstopts 522 #define tcp_ipp_rthdr tcp_sticky_ipp.ipp_rthdr 523 #define tcp_ipp_dstopts tcp_sticky_ipp.ipp_dstopts 524 #define tcp_ipp_nexthop tcp_sticky_ipp.ipp_nexthop 525 #define tcp_ipp_use_min_mtu tcp_sticky_ipp.ipp_use_min_mtu 526 struct tcp_s *tcp_saved_listener; /* saved value of listener */ 527 528 uint32_t tcp_in_ack_unsent; /* ACK for unsent data cnt. */ 529 530 /* 531 * The following fusion-related fields are protected by squeue. 532 */ 533 struct tcp_s *tcp_loopback_peer; /* peer tcp for loopback */ 534 mblk_t *tcp_fused_sigurg_mp; /* M_PCSIG mblk for SIGURG */ 535 size_t tcp_fuse_rcv_hiwater; /* fusion receive queue size */ 536 uint_t tcp_fuse_rcv_unread_hiwater; /* max # of outstanding pkts */ 537 /* 538 * The following fusion-related fields and bit fields are to be 539 * manipulated with squeue protection or with tcp_non_sq_lock held. 540 * tcp_non_sq_lock is used to protect fields that may be modified 541 * accessed outside the squeue. 542 */ 543 kmutex_t tcp_non_sq_lock; 544 kcondvar_t tcp_fuse_plugcv; 545 uint_t tcp_fuse_rcv_unread_cnt; /* # of outstanding pkts */ 546 uint32_t 547 tcp_fused : 1, /* loopback tcp in fusion mode */ 548 tcp_unfusable : 1, /* fusion not allowed on endpoint */ 549 tcp_fused_sigurg : 1, /* send SIGURG upon draining */ 550 tcp_direct_sockfs : 1, /* direct calls to sockfs */ 551 552 tcp_fuse_syncstr_stopped : 1, /* synchronous streams stopped */ 553 tcp_fuse_syncstr_plugged : 1, /* synchronous streams plugged */ 554 tcp_fuse_to_bit_31 : 26; 555 556 /* 557 * This variable is accessed without any lock protection 558 * and therefore must not be declared as a bit field along 559 * with the rest which require such condition. 560 */ 561 boolean_t tcp_issocket; /* this is a socket tcp */ 562 563 /* protected by the tcp_non_sq_lock lock */ 564 uint32_t tcp_squeue_bytes; 565 /* 566 * Kernel SSL session information 567 */ 568 boolean_t tcp_kssl_pending; /* waiting for 1st SSL rec. */ 569 boolean_t tcp_kssl_inhandshake; /* during SSL handshake */ 570 kssl_ent_t tcp_kssl_ent; /* SSL table entry */ 571 kssl_ctx_t tcp_kssl_ctx; /* SSL session */ 572 uint_t tcp_label_len; /* length of cached label */ 573 574 /* 575 * tcp_closemp_used is protected by listener's tcp_eager_lock 576 * when used for eagers. When used for a tcp in TIME_WAIT state 577 * or in tcp_close(), it is not protected by any lock as we 578 * do not expect any other thread to use it concurrently. 579 * Since we do allow re-use of tcp_closemp at certain places, 580 * tcp_closemp_used is declared as uint32_t instead of boolean_t 581 * to record any attempt to re-use tcp_closemp while it is still 582 * in use. This would facilitate debugging in non-debug kernels. 583 */ 584 uint32_t tcp_closemp_used; 585 586 /* 587 * previous and next eagers in the list of droppable eagers. See 588 * the comments before MAKE_DROPPABLE(). These pointers are 589 * protected by listener's tcp_eager_lock. 590 */ 591 struct tcp_s *tcp_eager_prev_drop_q0; 592 struct tcp_s *tcp_eager_next_drop_q0; 593 594 /* 595 * Have we flow controlled xmitter? 596 * This variable can be modified outside the squeue and hence must 597 * not be declared as a bit field along with the rest that are 598 * modified only within the squeue. 599 * protected by the tcp_non_sq_lock lock. 600 */ 601 boolean_t tcp_flow_stopped; 602 603 #ifdef DEBUG 604 pc_t tcmp_stk[15]; 605 #endif 606 } tcp_t; 607 608 #ifdef DEBUG 609 #define TCP_DEBUG_GETPCSTACK(buffer, depth) ((void) getpcstack(buffer, \ 610 depth)) 611 #else 612 #define TCP_DEBUG_GETPCSTACK(buffer, depth) 613 #endif 614 615 /* 616 * Track a reference count on the tcps in order to know when 617 * the tcps_g_q can be removed. As long as there is any 618 * tcp_t, other that the tcps_g_q itself, in the tcp_stack_t we 619 * need to keep tcps_g_q around so that a closing connection can 620 * switch to using tcps_g_q as part of it closing. 621 */ 622 #define TCPS_REFHOLD(tcps) { \ 623 atomic_add_32(&(tcps)->tcps_refcnt, 1); \ 624 ASSERT((tcps)->tcps_refcnt != 0); \ 625 DTRACE_PROBE1(tcps__refhold, tcp_stack_t, tcps); \ 626 } 627 628 /* 629 * Decrement the reference count on the tcp_stack_t. 630 * In architectures e.g sun4u, where atomic_add_32_nv is just 631 * a cas, we need to maintain the right memory barrier semantics 632 * as that of mutex_exit i.e all the loads and stores should complete 633 * before the cas is executed. membar_exit() does that here. 634 */ 635 #define TCPS_REFRELE(tcps) { \ 636 ASSERT((tcps)->tcps_refcnt != 0); \ 637 membar_exit(); \ 638 DTRACE_PROBE1(tcps__refrele, tcp_stack_t, tcps); \ 639 if (atomic_add_32_nv(&(tcps)->tcps_refcnt, -1) == 0 && \ 640 (tcps)->tcps_g_q != NULL) { \ 641 /* Only tcps_g_q left */ \ 642 tcp_g_q_inactive(tcps); \ 643 } \ 644 } 645 646 extern void tcp_free(tcp_t *tcp); 647 extern void tcp_ddi_g_init(void); 648 extern void tcp_ddi_g_destroy(void); 649 extern void tcp_g_q_inactive(tcp_stack_t *); 650 extern void tcp_xmit_listeners_reset(mblk_t *mp, uint_t ip_hdr_len, 651 zoneid_t zoneid, tcp_stack_t *); 652 extern void tcp_conn_request(void *arg, mblk_t *mp, void *arg2); 653 extern void tcp_conn_request_unbound(void *arg, mblk_t *mp, void *arg2); 654 extern void tcp_input(void *arg, mblk_t *mp, void *arg2); 655 extern void tcp_rput_data(void *arg, mblk_t *mp, void *arg2); 656 extern void *tcp_get_conn(void *arg, tcp_stack_t *); 657 extern void tcp_time_wait_collector(void *arg); 658 extern int tcp_snmp_get(queue_t *, mblk_t *); 659 extern int tcp_snmp_set(queue_t *, int, int, uchar_t *, int len); 660 extern mblk_t *tcp_xmit_mp(tcp_t *tcp, mblk_t *mp, int32_t max_to_send, 661 int32_t *offset, mblk_t **end_mp, uint32_t seq, 662 boolean_t sendall, uint32_t *seg_len, boolean_t rexmit); 663 /* 664 * The TCP Fanout structure. 665 * The hash tables and their linkage (tcp_*_hash_next, tcp_ptp*hn) are 666 * protected by the per-bucket tf_lock. Each tcp_t 667 * inserted in the list points back at this lock using tcp_*_lockp. 668 * 669 * The listener and acceptor hash queues are lists of tcp_t. 670 */ 671 /* listener hash and acceptor hash queue head */ 672 typedef struct tf_s { 673 tcp_t *tf_tcp; 674 kmutex_t tf_lock; 675 } tf_t; 676 #endif /* (defined(_KERNEL) || defined(_KMEMUSER)) */ 677 678 /* Contract private interface between TCP and Clustering. */ 679 680 #define CL_TCPI_V1 1 /* cl_tcpi_version number */ 681 682 typedef struct cl_tcp_info_s { 683 ushort_t cl_tcpi_version; /* cl_tcp_info_t's version no */ 684 ushort_t cl_tcpi_ipversion; /* IP version */ 685 int32_t cl_tcpi_state; /* TCP state */ 686 in_port_t cl_tcpi_lport; /* Local port */ 687 in_port_t cl_tcpi_fport; /* Remote port */ 688 in6_addr_t cl_tcpi_laddr_v6; /* Local IP address */ 689 in6_addr_t cl_tcpi_faddr_v6; /* Remote IP address */ 690 #ifdef _KERNEL 691 /* Note: V4_PART_OF_V6 is meant to be used only for _KERNEL defined stuff */ 692 #define cl_tcpi_laddr V4_PART_OF_V6(cl_tcpi_laddr_v6) 693 #define cl_tcpi_faddr V4_PART_OF_V6(cl_tcpi_faddr_v6) 694 695 #endif /* _KERNEL */ 696 } cl_tcp_info_t; 697 698 /* 699 * Hook functions to enable cluster networking 700 * On non-clustered systems these vectors must always be NULL. 701 */ 702 703 extern void (*cl_inet_listen)(uint8_t, sa_family_t, uint8_t *, in_port_t); 704 extern void (*cl_inet_unlisten)(uint8_t, sa_family_t, uint8_t *, 705 in_port_t); 706 707 /* 708 * Contracted Consolidation Private ioctl for aborting TCP connections. 709 * In order to keep the offsets and size of the structure the same between 710 * a 32-bit application and a 64-bit amd64 kernel, we use a #pragma 711 * pack(4). 712 */ 713 #define TCP_IOC_ABORT_CONN (('T' << 8) + 91) 714 715 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4 716 #pragma pack(4) 717 #endif 718 719 typedef struct tcp_ioc_abort_conn_s { 720 struct sockaddr_storage ac_local; /* local addr and port */ 721 struct sockaddr_storage ac_remote; /* remote addr and port */ 722 int32_t ac_start; /* start state */ 723 int32_t ac_end; /* end state */ 724 int32_t ac_zoneid; /* zoneid */ 725 } tcp_ioc_abort_conn_t; 726 727 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4 728 #pragma pack() 729 #endif 730 731 #if (defined(_KERNEL) || defined(_KMEMUSER)) 732 extern void tcp_rput_other(tcp_t *tcp, mblk_t *mp); 733 #endif 734 735 #ifdef __cplusplus 736 } 737 #endif 738 739 #endif /* _INET_TCP_H */ 740