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 2008 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/sodirect.h> 41 #include <sys/multidata.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/kssl/ksslapi.h> 51 52 /* 53 * Private (and possibly temporary) ioctl used by configuration code 54 * to lock in the "default" stream for detached closes. 55 */ 56 #define TCP_IOC_DEFAULT_Q (('T' << 8) + 51) 57 58 /* TCP states */ 59 #define TCPS_CLOSED -6 60 #define TCPS_IDLE -5 /* idle (opened, but not bound) */ 61 #define TCPS_BOUND -4 /* bound, ready to connect or accept */ 62 #define TCPS_LISTEN -3 /* listening for connection */ 63 #define TCPS_SYN_SENT -2 /* active, have sent syn */ 64 #define TCPS_SYN_RCVD -1 /* have received syn (and sent ours) */ 65 /* states < TCPS_ESTABLISHED are those where connections not established */ 66 #define TCPS_ESTABLISHED 0 /* established */ 67 #define TCPS_CLOSE_WAIT 1 /* rcvd fin, waiting for close */ 68 /* states > TCPS_CLOSE_WAIT are those where user has closed */ 69 #define TCPS_FIN_WAIT_1 2 /* have closed and sent fin */ 70 #define TCPS_CLOSING 3 /* closed, xchd FIN, await FIN ACK */ 71 #define TCPS_LAST_ACK 4 /* had fin and close; await FIN ACK */ 72 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ 73 #define TCPS_FIN_WAIT_2 5 /* have closed, fin is acked */ 74 #define TCPS_TIME_WAIT 6 /* in 2*msl quiet wait after close */ 75 76 /* 77 * Internal flags used in conjunction with the packet header flags. 78 * Used in tcp_rput_data to keep track of what needs to be done. 79 */ 80 #define TH_LIMIT_XMIT 0x0400 /* Limited xmit is needed */ 81 #define TH_XMIT_NEEDED 0x0800 /* Window opened - send queued data */ 82 #define TH_REXMIT_NEEDED 0x1000 /* Time expired for unacked data */ 83 #define TH_ACK_NEEDED 0x2000 /* Send an ack now. */ 84 #define TH_NEED_SACK_REXMIT 0x4000 /* Use SACK info to retransmission */ 85 #define TH_ACK_TIMER_NEEDED 0x8000 /* Start the delayed ACK timer */ 86 #define TH_ORDREL_NEEDED 0x10000 /* Generate an ordrel indication */ 87 #define TH_MARKNEXT_NEEDED 0x20000 /* Data should have MSGMARKNEXT */ 88 #define TH_SEND_URP_MARK 0x40000 /* Send up tcp_urp_mark_mp */ 89 90 /* 91 * TCP sequence numbers are 32 bit integers operated 92 * on with modular arithmetic. These macros can be 93 * used to compare such integers. 94 */ 95 #define SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 96 #define SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 97 #define SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 98 #define SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 99 100 /* TCP Protocol header */ 101 typedef struct tcphdr_s { 102 uint8_t th_lport[2]; /* Source port */ 103 uint8_t th_fport[2]; /* Destination port */ 104 uint8_t th_seq[4]; /* Sequence number */ 105 uint8_t th_ack[4]; /* Acknowledgement number */ 106 uint8_t th_offset_and_rsrvd[1]; /* Offset to the packet data */ 107 uint8_t th_flags[1]; 108 uint8_t th_win[2]; /* Allocation number */ 109 uint8_t th_sum[2]; /* TCP checksum */ 110 uint8_t th_urp[2]; /* Urgent pointer */ 111 } tcph_t; 112 113 #define TCP_HDR_LENGTH(tcph) (((tcph)->th_offset_and_rsrvd[0] >>2) &(0xF << 2)) 114 #define TCP_MAX_COMBINED_HEADER_LENGTH (60 + 60) /* Maxed out ip + tcp */ 115 #define TCP_MAX_IP_OPTIONS_LENGTH (60 - IP_SIMPLE_HDR_LENGTH) 116 #define TCP_MAX_HDR_LENGTH 60 117 #define TCP_MAX_TCP_OPTIONS_LENGTH (60 - sizeof (tcph_t)) 118 #define TCP_MIN_HEADER_LENGTH 20 119 #define TCP_MAXWIN 65535 120 #define TCP_PORT_LEN sizeof (in_port_t) 121 #define TCP_MAX_WINSHIFT 14 122 #define TCP_MAX_LARGEWIN (TCP_MAXWIN << TCP_MAX_WINSHIFT) 123 #define TCP_MAX_LSO_LENGTH (IP_MAXPACKET - TCP_MAX_COMBINED_HEADER_LENGTH) 124 125 #define TCPIP_HDR_LENGTH(mp, n) \ 126 (n) = IPH_HDR_LENGTH((mp)->b_rptr), \ 127 (n) += TCP_HDR_LENGTH((tcph_t *)&(mp)->b_rptr[(n)]) 128 129 /* TCP Protocol header (used if the header is known to be 32-bit aligned) */ 130 typedef struct tcphdra_s { 131 in_port_t tha_lport; /* Source port */ 132 in_port_t tha_fport; /* Destination port */ 133 uint32_t tha_seq; /* Sequence number */ 134 uint32_t tha_ack; /* Acknowledgement number */ 135 uint8_t tha_offset_and_reserved; /* Offset to the packet data */ 136 uint8_t tha_flags; 137 uint16_t tha_win; /* Allocation number */ 138 uint16_t tha_sum; /* TCP checksum */ 139 uint16_t tha_urp; /* Urgent pointer */ 140 } tcpha_t; 141 142 struct conn_s; 143 144 /* 145 * Control structure for each open TCP stream, 146 * defined only within the kernel or for a kmem user. 147 * NOTE: tcp_reinit_values MUST have a line for each field in this structure! 148 */ 149 #if (defined(_KERNEL) || defined(_KMEMUSER)) 150 151 typedef struct tcp_s { 152 /* Pointer to previous bind hash next. */ 153 struct tcp_s *tcp_time_wait_next; 154 /* Pointer to next T/W block */ 155 struct tcp_s *tcp_time_wait_prev; 156 /* Pointer to previous T/W next */ 157 clock_t tcp_time_wait_expire; 158 159 struct conn_s *tcp_connp; 160 tcp_stack_t *tcp_tcps; /* Shortcut via conn_netstack */ 161 162 int32_t tcp_state; 163 int32_t tcp_rcv_ws; /* My window scale power */ 164 int32_t tcp_snd_ws; /* Sender's window scale power */ 165 uint32_t tcp_ts_recent; /* Timestamp of earliest unacked */ 166 /* data segment */ 167 clock_t tcp_rto; /* Round trip timeout */ 168 clock_t tcp_last_rcv_lbolt; 169 /* lbolt on last packet, used for PAWS */ 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 queue_t *tcp_rq; /* Our upstream neighbor (client) */ 179 queue_t *tcp_wq; /* Our downstream neighbor */ 180 181 /* Fields arranged in approximate access order along main paths */ 182 mblk_t *tcp_xmit_head; /* Head of rexmit list */ 183 mblk_t *tcp_xmit_last; /* last valid data seen by tcp_wput */ 184 mblk_t *tcp_xmit_tail; /* Last rexmit data sent */ 185 uint32_t tcp_unsent; /* # of bytes in hand that are unsent */ 186 uint32_t tcp_xmit_tail_unsent; /* # of unsent bytes in xmit_tail */ 187 188 uint32_t tcp_suna; /* Sender unacknowledged */ 189 uint32_t tcp_rexmit_nxt; /* Next rexmit seq num */ 190 uint32_t tcp_rexmit_max; /* Max retran seq num */ 191 int32_t tcp_snd_burst; /* Send burst factor */ 192 uint32_t tcp_cwnd; /* Congestion window */ 193 int32_t tcp_cwnd_cnt; /* cwnd cnt in congestion avoidance */ 194 195 uint32_t tcp_ibsegs; /* Inbound segments on this stream */ 196 uint32_t tcp_obsegs; /* Outbound segments on this stream */ 197 198 uint32_t tcp_naglim; /* Tunable nagle limit */ 199 uint32_t tcp_valid_bits; 200 #define TCP_ISS_VALID 0x1 /* Is the tcp_iss seq num active? */ 201 #define TCP_FSS_VALID 0x2 /* Is the tcp_fss seq num active? */ 202 #define TCP_URG_VALID 0x4 /* Is the tcp_urg seq num active? */ 203 #define TCP_OFO_FIN_VALID 0x8 /* Has TCP received an out of order FIN? */ 204 205 206 int32_t tcp_xmit_hiwater; /* Send buffer high water mark. */ 207 208 timeout_id_t tcp_timer_tid; /* Control block for timer service */ 209 uchar_t tcp_timer_backoff; /* Backoff shift count. */ 210 int64_t tcp_last_recv_time; /* Last time we receive a segment. */ 211 uint32_t tcp_init_cwnd; /* Initial cwnd (start/restart) */ 212 213 /* 214 * Following socket options are set by sockfs outside the squeue 215 * and we want to separate these bit fields from the other bit fields 216 * set by TCP to avoid grabbing locks. sockfs ensures that only one 217 * thread in sockfs can set a socket option at a time on a conn_t. 218 * However TCP may read these options concurrently. The linger option 219 * needs atomicity since tcp_lingertime also needs to be in sync. 220 * However TCP uses it only during close, and by then no socket option 221 * can come down. So we don't need any locks, instead just separating 222 * the sockfs settable bit fields from the other bit fields is 223 * sufficient. 224 */ 225 uint32_t 226 tcp_debug : 1, /* SO_DEBUG "socket" option. */ 227 tcp_dontroute : 1, /* SO_DONTROUTE "socket" option. */ 228 tcp_broadcast : 1, /* SO_BROADCAST "socket" option. */ 229 tcp_useloopback : 1, /* SO_USELOOPBACK "socket" option. */ 230 231 tcp_oobinline : 1, /* SO_OOBINLINE "socket" option. */ 232 tcp_dgram_errind : 1, /* SO_DGRAM_ERRIND option */ 233 tcp_linger : 1, /* SO_LINGER turned on */ 234 tcp_reuseaddr : 1, /* SO_REUSEADDR "socket" option. */ 235 236 tcp_junk_to_bit_31 : 24; 237 238 /* Following manipulated by TCP under squeue protection */ 239 uint32_t 240 tcp_urp_last_valid : 1, /* Is tcp_urp_last valid? */ 241 tcp_hard_binding : 1, /* If we've started a full bind */ 242 tcp_hard_bound : 1, /* If we've done a full bind with IP */ 243 tcp_fin_acked : 1, /* Has our FIN been acked? */ 244 245 tcp_fin_rcvd : 1, /* Have we seen a FIN? */ 246 tcp_fin_sent : 1, /* Have we sent our FIN yet? */ 247 tcp_ordrel_done : 1, /* Have we sent the ord_rel upstream? */ 248 tcp_detached : 1, /* If we're detached from a stream */ 249 250 tcp_bind_pending : 1, /* Client is waiting for bind ack */ 251 tcp_unbind_pending : 1, /* Client sent T_UNBIND_REQ */ 252 tcp_deferred_clean_death : 1, 253 /* defer tcp endpoint cleanup etc. */ 254 tcp_conn_def_q0: 1, /* move from q0 to q deferred */ 255 256 tcp_ka_enabled: 1, /* Connection KeepAlive Timer needed */ 257 tcp_zero_win_probe: 1, /* Zero win probing is in progress */ 258 tcp_loopback: 1, /* src and dst are the same machine */ 259 tcp_localnet: 1, /* src and dst are on the same subnet */ 260 261 tcp_syn_defense: 1, /* For defense against SYN attack */ 262 #define tcp_dontdrop tcp_syn_defense 263 tcp_set_timer : 1, 264 tcp_active_open: 1, /* This is a active open */ 265 tcp_timeout : 1, /* qbufcall failed, qtimeout pending */ 266 267 tcp_rexmit : 1, /* TCP is retransmitting */ 268 tcp_snd_sack_ok : 1, /* Can use SACK for this connection */ 269 tcp_empty_flag : 1, /* Empty flag for future use */ 270 tcp_recvdstaddr : 1, /* return T_EXTCONN_IND with dst addr */ 271 272 tcp_hwcksum : 1, /* The NIC is capable of hwcksum */ 273 tcp_ip_forward_progress : 1, 274 tcp_anon_priv_bind : 1, 275 tcp_ecn_ok : 1, /* Can use ECN for this connection */ 276 277 tcp_ecn_echo_on : 1, /* Need to do ECN echo */ 278 tcp_ecn_cwr_sent : 1, /* ECN_CWR has been sent */ 279 tcp_cwr : 1, /* Cwnd has reduced recently */ 280 tcp_pad_to_bit31 : 1; 281 /* Following manipulated by TCP under squeue protection */ 282 uint32_t 283 tcp_mdt : 1, /* Lower layer is capable of MDT */ 284 tcp_snd_ts_ok : 1, 285 tcp_snd_ws_ok : 1, 286 tcp_exclbind : 1, /* ``exclusive'' binding */ 287 288 tcp_reserved_port : 1, 289 tcp_hdr_grown : 1, 290 tcp_in_free_list : 1, 291 tcp_snd_zcopy_on : 1, /* xmit zero-copy enabled */ 292 293 tcp_snd_zcopy_aware : 1, /* client is zero-copy aware */ 294 tcp_xmit_zc_clean : 1, /* the xmit list is free of zc-mblk */ 295 tcp_wait_for_eagers : 1, /* Wait for eagers to disappear */ 296 tcp_accept_error : 1, /* Error during TLI accept */ 297 298 tcp_send_discon_ind : 1, /* TLI accept err, send discon ind */ 299 tcp_cork : 1, /* tcp_cork option */ 300 tcp_tconnind_started : 1, /* conn_ind message is being sent */ 301 tcp_lso :1, /* Lower layer is capable of LSO */ 302 tcp_pad_to_bit_31 : 16; 303 304 uint32_t tcp_if_mtu; /* Outgoing interface MTU. */ 305 306 mblk_t *tcp_reass_head; /* Out of order reassembly list head */ 307 mblk_t *tcp_reass_tail; /* Out of order reassembly list tail */ 308 309 tcp_sack_info_t *tcp_sack_info; 310 311 #define tcp_pipe tcp_sack_info->tcp_pipe 312 #define tcp_fack tcp_sack_info->tcp_fack 313 #define tcp_sack_snxt tcp_sack_info->tcp_sack_snxt 314 #define tcp_max_sack_blk tcp_sack_info->tcp_max_sack_blk 315 #define tcp_num_sack_blk tcp_sack_info->tcp_num_sack_blk 316 #define tcp_sack_list tcp_sack_info->tcp_sack_list 317 #define tcp_num_notsack_blk tcp_sack_info->tcp_num_notsack_blk 318 #define tcp_cnt_notsack_list tcp_sack_info->tcp_cnt_notsack_list 319 #define tcp_notsack_list tcp_sack_info->tcp_notsack_list 320 321 mblk_t *tcp_rcv_list; /* Queued until push, urgent data, */ 322 mblk_t *tcp_rcv_last_head; /* optdata, or the count exceeds */ 323 mblk_t *tcp_rcv_last_tail; /* tcp_rcv_push_wait. */ 324 uint32_t tcp_rcv_cnt; /* tcp_rcv_list is b_next chain. */ 325 326 uint32_t tcp_cwnd_ssthresh; /* Congestion window */ 327 uint32_t tcp_cwnd_max; 328 uint32_t tcp_csuna; /* Clear (no rexmits in window) suna */ 329 330 clock_t tcp_rtt_sa; /* Round trip smoothed average */ 331 clock_t tcp_rtt_sd; /* Round trip smoothed deviation */ 332 clock_t tcp_rtt_update; /* Round trip update(s) */ 333 clock_t tcp_ms_we_have_waited; /* Total retrans time */ 334 335 uint32_t tcp_swl1; /* These help us avoid using stale */ 336 uint32_t tcp_swl2; /* packets to update state */ 337 338 uint32_t tcp_rack; /* Seq # we have acked */ 339 uint32_t tcp_rack_cnt; /* # of segs we have deferred ack */ 340 uint32_t tcp_rack_cur_max; /* # of segs we may defer ack for now */ 341 uint32_t tcp_rack_abs_max; /* # of segs we may defer ack ever */ 342 timeout_id_t tcp_ack_tid; /* Delayed ACK timer ID */ 343 timeout_id_t tcp_push_tid; /* Push timer ID */ 344 345 uint32_t tcp_max_swnd; /* Maximum swnd we have seen */ 346 347 struct tcp_s *tcp_listener; /* Our listener */ 348 349 int32_t tcp_xmit_lowater; /* Send buffer low water mark. */ 350 351 uint32_t tcp_irs; /* Initial recv seq num */ 352 uint32_t tcp_fss; /* Final/fin send seq num */ 353 uint32_t tcp_urg; /* Urgent data seq num */ 354 355 clock_t tcp_first_timer_threshold; /* When to prod IP */ 356 clock_t tcp_second_timer_threshold; /* When to give up completely */ 357 clock_t tcp_first_ctimer_threshold; /* 1st threshold while connecting */ 358 clock_t tcp_second_ctimer_threshold; /* 2nd ... while connecting */ 359 360 int tcp_lingertime; /* Close linger time (in seconds) */ 361 362 uint32_t tcp_urp_last; /* Last urp for which signal sent */ 363 mblk_t *tcp_urp_mp; /* T_EXDATA_IND for urgent byte */ 364 mblk_t *tcp_urp_mark_mp; /* zero-length marked/unmarked msg */ 365 366 int tcp_conn_req_cnt_q0; /* # of conn reqs in SYN_RCVD */ 367 int tcp_conn_req_cnt_q; /* # of conn reqs in ESTABLISHED */ 368 int tcp_conn_req_max; /* # of ESTABLISHED conn reqs allowed */ 369 t_scalar_t tcp_conn_req_seqnum; /* Incrementing pending conn req ID */ 370 #define tcp_ip_addr_cache tcp_reass_tail 371 /* Cache ip addresses that */ 372 /* complete the 3-way handshake */ 373 kmutex_t tcp_eager_lock; 374 struct tcp_s *tcp_eager_next_q; /* next eager in ESTABLISHED state */ 375 struct tcp_s *tcp_eager_last_q; /* last eager in ESTABLISHED state */ 376 struct tcp_s *tcp_eager_next_q0; /* next eager in SYN_RCVD state */ 377 struct tcp_s *tcp_eager_prev_q0; /* prev eager in SYN_RCVD state */ 378 /* all eagers form a circular list */ 379 union { 380 mblk_t *tcp_eager_conn_ind; /* T_CONN_IND waiting for 3rd ack. */ 381 mblk_t *tcp_opts_conn_req; /* T_CONN_REQ w/ options processed */ 382 } tcp_conn; 383 uint32_t tcp_syn_rcvd_timeout; /* How many SYN_RCVD timeout in q0 */ 384 385 /* TCP Keepalive Timer members */ 386 int32_t tcp_ka_last_intrvl; /* Last probe interval */ 387 timeout_id_t tcp_ka_tid; /* Keepalive timer ID */ 388 uint32_t tcp_ka_interval; /* Keepalive interval */ 389 uint32_t tcp_ka_abort_thres; /* Keepalive abort threshold */ 390 391 int32_t tcp_client_errno; /* How the client screwed up */ 392 393 char *tcp_iphc; /* Buffer holding tcp/ip hdr template */ 394 int tcp_iphc_len; /* actual allocated buffer size */ 395 int32_t tcp_hdr_len; /* Byte len of combined TCP/IP hdr */ 396 ipha_t *tcp_ipha; /* IPv4 header in the buffer */ 397 ip6_t *tcp_ip6h; /* IPv6 header in the buffer */ 398 int tcp_ip_hdr_len; /* Byte len of our current IPvx hdr */ 399 tcph_t *tcp_tcph; /* tcp header within combined hdr */ 400 int32_t tcp_tcp_hdr_len; /* tcp header len within combined */ 401 402 uint32_t tcp_sum; /* checksum to compensate for source */ 403 /* routed packets. Host byte order */ 404 uint16_t tcp_last_sent_len; /* Record length for nagle */ 405 uint16_t tcp_dupack_cnt; /* # of consequtive duplicate acks */ 406 407 kmutex_t *tcp_acceptor_lockp; /* Ptr to tf_lock */ 408 409 timeout_id_t tcp_ordrelid; /* qbufcall/qtimeout id */ 410 t_uscalar_t tcp_acceptor_id; /* ACCEPTOR_id */ 411 412 int tcp_ipsec_overhead; 413 /* 414 * Address family that app wishes returned addrsses to be in. 415 * Currently taken from address family used in T_BIND_REQ, but 416 * should really come from family used in original socket() call. 417 * Value can be AF_INET or AF_INET6. 418 */ 419 uint_t tcp_family; 420 /* 421 * used for a quick test to determine if any ancillary bits are 422 * set 423 */ 424 uint_t tcp_ipv6_recvancillary; /* Flags */ 425 #define TCP_IPV6_RECVPKTINFO 0x01 /* IPV6_RECVPKTINFO option */ 426 #define TCP_IPV6_RECVHOPLIMIT 0x02 /* IPV6_RECVHOPLIMIT option */ 427 #define TCP_IPV6_RECVHOPOPTS 0x04 /* IPV6_RECVHOPOPTS option */ 428 #define TCP_IPV6_RECVDSTOPTS 0x08 /* IPV6_RECVDSTOPTS option */ 429 #define TCP_IPV6_RECVRTHDR 0x10 /* IPV6_RECVRTHDR option */ 430 #define TCP_IPV6_RECVRTDSTOPTS 0x20 /* IPV6_RECVRTHDRDSTOPTS option */ 431 #define TCP_IPV6_RECVTCLASS 0x40 /* IPV6_RECVTCLASS option */ 432 #define TCP_OLD_IPV6_RECVDSTOPTS 0x80 /* old IPV6_RECVDSTOPTS option */ 433 434 uint_t tcp_recvifindex; /* Last received IPV6_RCVPKTINFO */ 435 uint_t tcp_recvhops; /* Last received IPV6_RECVHOPLIMIT */ 436 uint_t tcp_recvtclass; /* Last received IPV6_RECVTCLASS */ 437 ip6_hbh_t *tcp_hopopts; /* Last received IPV6_RECVHOPOPTS */ 438 ip6_dest_t *tcp_dstopts; /* Last received IPV6_RECVDSTOPTS */ 439 ip6_dest_t *tcp_rtdstopts; /* Last recvd IPV6_RECVRTHDRDSTOPTS */ 440 ip6_rthdr_t *tcp_rthdr; /* Last received IPV6_RECVRTHDR */ 441 uint_t tcp_hopoptslen; 442 uint_t tcp_dstoptslen; 443 uint_t tcp_rtdstoptslen; 444 uint_t tcp_rthdrlen; 445 446 mblk_t *tcp_timercache; 447 cred_t *tcp_cred; /* Credentials when this was opened */ 448 pid_t tcp_cpid; /* Process id when this was opened */ 449 uint64_t tcp_open_time; /* time when this was opened */ 450 451 452 union { 453 struct { 454 uchar_t v4_ttl; 455 /* Dup of tcp_ipha.iph_type_of_service */ 456 uchar_t v4_tos; /* Dup of tcp_ipha.iph_ttl */ 457 } v4_hdr_info; 458 struct { 459 uint_t v6_vcf; /* Dup of tcp_ip6h.ip6h_vcf */ 460 uchar_t v6_hops; /* Dup of tcp_ip6h.ip6h_hops */ 461 } v6_hdr_info; 462 } tcp_hdr_info; 463 #define tcp_ttl tcp_hdr_info.v4_hdr_info.v4_ttl 464 #define tcp_tos tcp_hdr_info.v4_hdr_info.v4_tos 465 #define tcp_ip6_vcf tcp_hdr_info.v6_hdr_info.v6_vcf 466 #define tcp_ip6_hops tcp_hdr_info.v6_hdr_info.v6_hops 467 468 ushort_t tcp_ipversion; 469 uint_t tcp_bound_if; /* IPV6_BOUND_IF */ 470 471 #define tcp_lport tcp_connp->conn_lport 472 #define tcp_fport tcp_connp->conn_fport 473 #define tcp_ports tcp_connp->conn_ports 474 475 #define tcp_remote tcp_connp->conn_rem 476 #define tcp_ip_src tcp_connp->conn_src 477 478 #define tcp_remote_v6 tcp_connp->conn_remv6 479 #define tcp_ip_src_v6 tcp_connp->conn_srcv6 480 #define tcp_bound_source_v6 tcp_connp->conn_bound_source_v6 481 #define tcp_bound_source tcp_connp->conn_bound_source 482 483 kmutex_t tcp_closelock; 484 kcondvar_t tcp_closecv; 485 uint8_t tcp_closed; 486 uint8_t tcp_closeflags; 487 uint8_t tcp_cleandeathtag; 488 mblk_t tcp_closemp; 489 timeout_id_t tcp_linger_tid; /* Linger timer ID */ 490 void *tcp_tracebuf; 491 492 struct tcp_s *tcp_acceptor_hash; /* Acceptor hash chain */ 493 struct tcp_s **tcp_ptpahn; /* Pointer to previous accept hash next. */ 494 struct tcp_s *tcp_bind_hash; /* Bind hash chain */ 495 struct tcp_s **tcp_ptpbhn; 496 497 boolean_t tcp_ire_ill_check_done; 498 uint_t tcp_maxpsz; 499 500 /* 501 * used for Multidata Transmit 502 */ 503 uint_t tcp_mdt_hdr_head; /* leading header fragment extra space */ 504 uint_t tcp_mdt_hdr_tail; /* trailing header fragment extra space */ 505 int tcp_mdt_max_pld; /* maximum payload buffers per Multidata */ 506 507 uint32_t tcp_lso_max; /* maximum LSO payload */ 508 509 uint32_t tcp_ofo_fin_seq; /* Recv out of order FIN seq num */ 510 uint32_t tcp_cwr_snd_max; 511 uint_t tcp_drop_opt_ack_cnt; /* # tcp generated optmgmt */ 512 ip6_pkt_t tcp_sticky_ipp; /* Sticky options */ 513 #define tcp_ipp_fields tcp_sticky_ipp.ipp_fields /* valid fields */ 514 #define tcp_ipp_ifindex tcp_sticky_ipp.ipp_ifindex /* pktinfo ifindex */ 515 #define tcp_ipp_addr tcp_sticky_ipp.ipp_addr /* pktinfo src/dst addr */ 516 #define tcp_ipp_hoplimit tcp_sticky_ipp.ipp_hoplimit 517 #define tcp_ipp_hopoptslen tcp_sticky_ipp.ipp_hopoptslen 518 #define tcp_ipp_rtdstoptslen tcp_sticky_ipp.ipp_rtdstoptslen 519 #define tcp_ipp_rthdrlen tcp_sticky_ipp.ipp_rthdrlen 520 #define tcp_ipp_dstoptslen tcp_sticky_ipp.ipp_dstoptslen 521 #define tcp_ipp_hopopts tcp_sticky_ipp.ipp_hopopts 522 #define tcp_ipp_rtdstopts tcp_sticky_ipp.ipp_rtdstopts 523 #define tcp_ipp_rthdr tcp_sticky_ipp.ipp_rthdr 524 #define tcp_ipp_dstopts tcp_sticky_ipp.ipp_dstopts 525 #define tcp_ipp_nexthop tcp_sticky_ipp.ipp_nexthop 526 #define tcp_ipp_use_min_mtu tcp_sticky_ipp.ipp_use_min_mtu 527 struct tcp_s *tcp_saved_listener; /* saved value of listener */ 528 529 uint32_t tcp_in_ack_unsent; /* ACK for unsent data cnt. */ 530 531 /* 532 * The following fusion-related fields are protected by squeue. 533 */ 534 struct tcp_s *tcp_loopback_peer; /* peer tcp for loopback */ 535 mblk_t *tcp_fused_sigurg_mp; /* M_PCSIG mblk for SIGURG */ 536 size_t tcp_fuse_rcv_hiwater; /* fusion receive queue size */ 537 uint_t tcp_fuse_rcv_unread_hiwater; /* max # of outstanding pkts */ 538 /* 539 * The following fusion-related fields and bit fields are to be 540 * manipulated with squeue protection or with tcp_non_sq_lock held. 541 * tcp_non_sq_lock is used to protect fields that may be modified 542 * accessed outside the squeue. 543 */ 544 kmutex_t tcp_non_sq_lock; 545 kcondvar_t tcp_fuse_plugcv; 546 uint_t tcp_fuse_rcv_unread_cnt; /* # of outstanding pkts */ 547 uint32_t 548 tcp_fused : 1, /* loopback tcp in fusion mode */ 549 tcp_unfusable : 1, /* fusion not allowed on endpoint */ 550 tcp_fused_sigurg : 1, /* send SIGURG upon draining */ 551 tcp_direct_sockfs : 1, /* direct calls to sockfs */ 552 553 tcp_fuse_syncstr_stopped : 1, /* synchronous streams stopped */ 554 tcp_fuse_syncstr_plugged : 1, /* synchronous streams plugged */ 555 tcp_fuse_to_bit_31 : 26; 556 557 /* 558 * This variable is accessed without any lock protection 559 * and therefore must not be declared as a bit field along 560 * with the rest which require such condition. 561 */ 562 boolean_t tcp_issocket; /* this is a socket tcp */ 563 564 /* protected by the tcp_non_sq_lock lock */ 565 uint32_t tcp_squeue_bytes; 566 /* 567 * Kernel SSL session information 568 */ 569 boolean_t tcp_kssl_pending; /* waiting for 1st SSL rec. */ 570 boolean_t tcp_kssl_inhandshake; /* during SSL handshake */ 571 kssl_ent_t tcp_kssl_ent; /* SSL table entry */ 572 kssl_ctx_t tcp_kssl_ctx; /* SSL session */ 573 uint_t tcp_label_len; /* length of cached label */ 574 575 /* 576 * tcp_closemp_used is protected by listener's tcp_eager_lock 577 * when used for eagers. When used for a tcp in TIME_WAIT state 578 * or in tcp_close(), it is not protected by any lock as we 579 * do not expect any other thread to use it concurrently. 580 * We do allow re-use of tcp_closemp in tcp_time_wait_collector() 581 * and tcp_close() but not concurrently. 582 */ 583 boolean_t tcp_closemp_used; 584 585 /* 586 * previous and next eagers in the list of droppable eagers. See 587 * the comments before MAKE_DROPPABLE(). These pointers are 588 * protected by listener's tcp_eager_lock. 589 */ 590 struct tcp_s *tcp_eager_prev_drop_q0; 591 struct tcp_s *tcp_eager_next_drop_q0; 592 593 /* 594 * Have we flow controlled xmitter? 595 * This variable can be modified outside the squeue and hence must 596 * not be declared as a bit field along with the rest that are 597 * modified only within the squeue. 598 * protected by the tcp_non_sq_lock lock. 599 */ 600 boolean_t tcp_flow_stopped; 601 602 /* 603 * tcp_sodirect is used by tcp on the receive side to push mblk_t(s) 604 * directly to sockfs. Also, to schedule asynchronous copyout directly 605 * to a pending user-land uio buffer. 606 */ 607 sodirect_t *tcp_sodirect; 608 609 #ifdef DEBUG 610 pc_t tcmp_stk[15]; 611 #endif 612 } tcp_t; 613 614 #ifdef DEBUG 615 #define TCP_DEBUG_GETPCSTACK(buffer, depth) ((void) getpcstack(buffer, \ 616 depth)) 617 #else 618 #define TCP_DEBUG_GETPCSTACK(buffer, depth) 619 #endif 620 621 /* 622 * Track a reference count on the tcps in order to know when 623 * the tcps_g_q can be removed. As long as there is any 624 * tcp_t, other that the tcps_g_q itself, in the tcp_stack_t we 625 * need to keep tcps_g_q around so that a closing connection can 626 * switch to using tcps_g_q as part of it closing. 627 */ 628 #define TCPS_REFHOLD(tcps) { \ 629 atomic_add_32(&(tcps)->tcps_refcnt, 1); \ 630 ASSERT((tcps)->tcps_refcnt != 0); \ 631 DTRACE_PROBE1(tcps__refhold, tcp_stack_t, tcps); \ 632 } 633 634 /* 635 * Decrement the reference count on the tcp_stack_t. 636 * In architectures e.g sun4u, where atomic_add_32_nv is just 637 * a cas, we need to maintain the right memory barrier semantics 638 * as that of mutex_exit i.e all the loads and stores should complete 639 * before the cas is executed. membar_exit() does that here. 640 */ 641 #define TCPS_REFRELE(tcps) { \ 642 ASSERT((tcps)->tcps_refcnt != 0); \ 643 membar_exit(); \ 644 DTRACE_PROBE1(tcps__refrele, tcp_stack_t, tcps); \ 645 if (atomic_add_32_nv(&(tcps)->tcps_refcnt, -1) == 0 && \ 646 (tcps)->tcps_g_q != NULL) { \ 647 /* Only tcps_g_q left */ \ 648 tcp_g_q_inactive(tcps); \ 649 } \ 650 } 651 652 extern void tcp_free(tcp_t *tcp); 653 extern void tcp_ddi_g_init(void); 654 extern void tcp_ddi_g_destroy(void); 655 extern void tcp_g_q_inactive(tcp_stack_t *); 656 extern void tcp_xmit_listeners_reset(mblk_t *mp, uint_t ip_hdr_len, 657 zoneid_t zoneid, tcp_stack_t *, conn_t *connp); 658 extern void tcp_conn_request(void *arg, mblk_t *mp, void *arg2); 659 extern void tcp_conn_request_unbound(void *arg, mblk_t *mp, void *arg2); 660 extern void tcp_input(void *arg, mblk_t *mp, void *arg2); 661 extern void tcp_rput_data(void *arg, mblk_t *mp, void *arg2); 662 extern void *tcp_get_conn(void *arg, tcp_stack_t *); 663 extern void tcp_time_wait_collector(void *arg); 664 extern mblk_t *tcp_snmp_get(queue_t *, mblk_t *); 665 extern int tcp_snmp_set(queue_t *, int, int, uchar_t *, int len); 666 extern mblk_t *tcp_xmit_mp(tcp_t *tcp, mblk_t *mp, int32_t max_to_send, 667 int32_t *offset, mblk_t **end_mp, uint32_t seq, 668 boolean_t sendall, uint32_t *seg_len, boolean_t rexmit); 669 /* 670 * The TCP Fanout structure. 671 * The hash tables and their linkage (tcp_*_hash_next, tcp_ptp*hn) are 672 * protected by the per-bucket tf_lock. Each tcp_t 673 * inserted in the list points back at this lock using tcp_*_lockp. 674 * 675 * The listener and acceptor hash queues are lists of tcp_t. 676 */ 677 /* listener hash and acceptor hash queue head */ 678 typedef struct tf_s { 679 tcp_t *tf_tcp; 680 kmutex_t tf_lock; 681 } tf_t; 682 #endif /* (defined(_KERNEL) || defined(_KMEMUSER)) */ 683 684 /* Contract private interface between TCP and Clustering. */ 685 686 #define CL_TCPI_V1 1 /* cl_tcpi_version number */ 687 688 typedef struct cl_tcp_info_s { 689 ushort_t cl_tcpi_version; /* cl_tcp_info_t's version no */ 690 ushort_t cl_tcpi_ipversion; /* IP version */ 691 int32_t cl_tcpi_state; /* TCP state */ 692 in_port_t cl_tcpi_lport; /* Local port */ 693 in_port_t cl_tcpi_fport; /* Remote port */ 694 in6_addr_t cl_tcpi_laddr_v6; /* Local IP address */ 695 in6_addr_t cl_tcpi_faddr_v6; /* Remote IP address */ 696 #ifdef _KERNEL 697 /* Note: V4_PART_OF_V6 is meant to be used only for _KERNEL defined stuff */ 698 #define cl_tcpi_laddr V4_PART_OF_V6(cl_tcpi_laddr_v6) 699 #define cl_tcpi_faddr V4_PART_OF_V6(cl_tcpi_faddr_v6) 700 701 #endif /* _KERNEL */ 702 } cl_tcp_info_t; 703 704 /* 705 * Hook functions to enable cluster networking 706 * On non-clustered systems these vectors must always be NULL. 707 */ 708 709 extern void (*cl_inet_listen)(uint8_t, sa_family_t, uint8_t *, in_port_t); 710 extern void (*cl_inet_unlisten)(uint8_t, sa_family_t, uint8_t *, 711 in_port_t); 712 713 /* 714 * Contracted Consolidation Private ioctl for aborting TCP connections. 715 * In order to keep the offsets and size of the structure the same between 716 * a 32-bit application and a 64-bit amd64 kernel, we use a #pragma 717 * pack(4). 718 */ 719 #define TCP_IOC_ABORT_CONN (('T' << 8) + 91) 720 721 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4 722 #pragma pack(4) 723 #endif 724 725 typedef struct tcp_ioc_abort_conn_s { 726 struct sockaddr_storage ac_local; /* local addr and port */ 727 struct sockaddr_storage ac_remote; /* remote addr and port */ 728 int32_t ac_start; /* start state */ 729 int32_t ac_end; /* end state */ 730 int32_t ac_zoneid; /* zoneid */ 731 } tcp_ioc_abort_conn_t; 732 733 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4 734 #pragma pack() 735 #endif 736 737 #if (defined(_KERNEL) || defined(_KMEMUSER)) 738 extern void tcp_rput_other(tcp_t *tcp, mblk_t *mp); 739 #endif 740 741 #ifdef __cplusplus 742 } 743 #endif 744 745 #endif /* _INET_TCP_H */ 746