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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2011, Joyent Inc. All rights reserved.
  24  */
  25 
  26 #ifndef _INET_TCP_IMPL_H
  27 #define _INET_TCP_IMPL_H
  28 
  29 /*
  30  * TCP implementation private declarations.  These interfaces are
  31  * used to build the IP module and are not meant to be accessed
  32  * by any modules except IP itself.  They are undocumented and are
  33  * subject to change without notice.
  34  */
  35 
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39 
  40 #ifdef _KERNEL
  41 
  42 #include <sys/cpuvar.h>
  43 #include <sys/clock_impl.h>       /* For LBOLT_FASTPATH{,64} */
  44 #include <inet/optcom.h>
  45 #include <inet/tcp.h>
  46 #include <inet/tunables.h>
  47 
  48 #define TCP_MOD_ID      5105
  49 
  50 extern struct qinit     tcp_sock_winit;
  51 extern struct qinit     tcp_winit;
  52 
  53 extern sock_downcalls_t sock_tcp_downcalls;
  54 
  55 /*
  56  * Bind hash list size and has function.  It has to be a power of 2 for
  57  * hashing.
  58  */
  59 #define TCP_BIND_FANOUT_SIZE    1024
  60 #define TCP_BIND_HASH(lport) (ntohs(lport) & (TCP_BIND_FANOUT_SIZE - 1))
  61 
  62 /*
  63  * This implementation follows the 4.3BSD interpretation of the urgent
  64  * pointer and not RFC 1122. Switching to RFC 1122 behavior would cause
  65  * incompatible changes in protocols like telnet and rlogin.
  66  */
  67 #define TCP_OLD_URP_INTERPRETATION      1
  68 
  69 /* TCP option length */
  70 #define TCPOPT_NOP_LEN          1
  71 #define TCPOPT_MAXSEG_LEN       4
  72 #define TCPOPT_WS_LEN           3
  73 #define TCPOPT_REAL_WS_LEN      (TCPOPT_WS_LEN+1)
  74 #define TCPOPT_TSTAMP_LEN       10
  75 #define TCPOPT_REAL_TS_LEN      (TCPOPT_TSTAMP_LEN+2)
  76 #define TCPOPT_SACK_OK_LEN      2
  77 #define TCPOPT_REAL_SACK_OK_LEN (TCPOPT_SACK_OK_LEN+2)
  78 #define TCPOPT_REAL_SACK_LEN    4
  79 #define TCPOPT_MAX_SACK_LEN     36
  80 #define TCPOPT_HEADER_LEN       2
  81 
  82 /* Round up the value to the nearest mss. */
  83 #define MSS_ROUNDUP(value, mss)         ((((value) - 1) / (mss) + 1) * (mss))
  84 
  85 /*
  86  * Was this tcp created via socket() interface?
  87  */
  88 #define TCP_IS_SOCKET(tcp)      ((tcp)->tcp_issocket)
  89 
  90 /*
  91  * Is this tcp not attached to any upper client?
  92  */
  93 #define TCP_IS_DETACHED(tcp)    ((tcp)->tcp_detached)
  94 
  95 /* TCP timers related data strucutres.  Refer to tcp_timers.c. */
  96 typedef struct tcp_timer_s {
  97         conn_t  *connp;
  98         void    (*tcpt_proc)(void *);
  99         callout_id_t   tcpt_tid;
 100 } tcp_timer_t;
 101 
 102 extern kmem_cache_t *tcp_timercache;
 103 
 104 /*
 105  * Macro for starting various timers.  Retransmission timer has its own macro,
 106  * TCP_TIMER_RESTART().  tim is in millisec.
 107  */
 108 #define TCP_TIMER(tcp, f, tim)          \
 109         tcp_timeout(tcp->tcp_connp, f, tim)
 110 #define TCP_TIMER_CANCEL(tcp, id)       \
 111         tcp_timeout_cancel(tcp->tcp_connp, id)
 112 
 113 /*
 114  * To restart the TCP retransmission timer.  intvl is in millisec.
 115  */
 116 #define TCP_TIMER_RESTART(tcp, intvl) {                                 \
 117         if ((tcp)->tcp_timer_tid != 0)                                       \
 118                 (void) TCP_TIMER_CANCEL((tcp), (tcp)->tcp_timer_tid);        \
 119         (tcp)->tcp_timer_tid = TCP_TIMER((tcp), tcp_timer, (intvl)); \
 120 }
 121 
 122 /*
 123  * For scalability, we must not run a timer for every TCP connection
 124  * in TIME_WAIT state.  To see why, consider (for time wait interval of
 125  * 1 minutes):
 126  *      10,000 connections/sec * 60 seconds/time wait = 600,000 active conn's
 127  *
 128  * This list is ordered by time, so you need only delete from the head
 129  * until you get to entries which aren't old enough to delete yet.
 130  * The list consists of only the detached TIME_WAIT connections.
 131  *
 132  * When a tcp_t enters TIME_WAIT state, a timer is started (timeout is
 133  * tcps_time_wait_interval).  When the tcp_t is detached (upper layer closes
 134  * the end point), it is moved to the time wait list and another timer is
 135  * started (expiry time is set at tcp_time_wait_expire, which is
 136  * also calculated using tcps_time_wait_interval).  This means that the
 137  * TIME_WAIT state can be extended (up to doubled) if the tcp_t doesn't
 138  * become detached for a long time.
 139  *
 140  * The list manipulations (including tcp_time_wait_next/prev)
 141  * are protected by the tcp_time_wait_lock. The content of the
 142  * detached TIME_WAIT connections is protected by the normal perimeters.
 143  *
 144  * This list is per squeue and squeues are shared across the tcp_stack_t's.
 145  * Things on tcp_time_wait_head remain associated with the tcp_stack_t
 146  * and conn_netstack.
 147  * The tcp_t's that are added to tcp_free_list are disassociated and
 148  * have NULL tcp_tcps and conn_netstack pointers.
 149  */
 150 typedef struct tcp_squeue_priv_s {
 151         kmutex_t        tcp_time_wait_lock;
 152         callout_id_t    tcp_time_wait_tid;
 153         tcp_t           *tcp_time_wait_head;
 154         tcp_t           *tcp_time_wait_tail;
 155         tcp_t           *tcp_free_list;
 156         uint_t          tcp_free_list_cnt;
 157 #ifdef DEBUG
 158         /*
 159          * For debugging purpose, true when tcp_time_wait_collector() is
 160          * running.
 161          */
 162         boolean_t       tcp_time_wait_running;
 163 #endif
 164 } tcp_squeue_priv_t;
 165 
 166 /*
 167  * Parameters for TCP Initial Send Sequence number (ISS) generation.  When
 168  * tcp_strong_iss is set to 1, which is the default, the ISS is calculated
 169  * by adding three components: a time component which grows by 1 every 4096
 170  * nanoseconds (versus every 4 microseconds suggested by RFC 793, page 27);
 171  * a per-connection component which grows by 125000 for every new connection;
 172  * and an "extra" component that grows by a random amount centered
 173  * approximately on 64000.  This causes the ISS generator to cycle every
 174  * 4.89 hours if no TCP connections are made, and faster if connections are
 175  * made.
 176  *
 177  * When tcp_strong_iss is set to 0, ISS is calculated by adding two
 178  * components: a time component which grows by 250000 every second; and
 179  * a per-connection component which grows by 125000 for every new connections.
 180  *
 181  * A third method, when tcp_strong_iss is set to 2, for generating ISS is
 182  * prescribed by Steve Bellovin.  This involves adding time, the 125000 per
 183  * connection, and a one-way hash (MD5) of the connection ID <sport, dport,
 184  * src, dst>, a "truly" random (per RFC 1750) number, and a console-entered
 185  * password.
 186  */
 187 #define ISS_INCR        250000
 188 #define ISS_NSEC_SHT    12
 189 
 190 /* Macros for timestamp comparisons */
 191 #define TSTMP_GEQ(a, b) ((int32_t)((a)-(b)) >= 0)
 192 #define TSTMP_LT(a, b)  ((int32_t)((a)-(b)) < 0)
 193 
 194 /*
 195  * Initialize cwnd according to RFC 3390.  def_max_init_cwnd is
 196  * either tcp_slow_start_initial or tcp_slow_start_after idle
 197  * depending on the caller.  If the upper layer has not used the
 198  * TCP_INIT_CWND option to change the initial cwnd, tcp_init_cwnd
 199  * should be 0 and we use the formula in RFC 3390 to set tcp_cwnd.
 200  * If the upper layer has changed set the tcp_init_cwnd, just use
 201  * it to calculate the tcp_cwnd.
 202  */
 203 #define TCP_SET_INIT_CWND(tcp, mss, def_max_init_cwnd)                  \
 204 {                                                                       \
 205         if ((tcp)->tcp_init_cwnd == 0) {                             \
 206                 (tcp)->tcp_cwnd = MIN(def_max_init_cwnd * (mss),     \
 207                     MIN(4 * (mss), MAX(2 * (mss), 4380 / (mss) * (mss)))); \
 208         } else {                                                        \
 209                 (tcp)->tcp_cwnd = (tcp)->tcp_init_cwnd * (mss);           \
 210         }                                                               \
 211         tcp->tcp_cwnd_cnt = 0;                                               \
 212 }
 213 
 214 /*
 215  * Set ECN capable transport (ECT) code point in IP header.
 216  *
 217  * Note that there are 2 ECT code points '01' and '10', which are called
 218  * ECT(1) and ECT(0) respectively.  Here we follow the original ECT code
 219  * point ECT(0) for TCP as described in RFC 2481.
 220  */
 221 #define TCP_SET_ECT(tcp, iph) \
 222         if ((tcp)->tcp_connp->conn_ipversion == IPV4_VERSION) { \
 223                 /* We need to clear the code point first. */ \
 224                 ((ipha_t *)(iph))->ipha_type_of_service &= 0xFC; \
 225                 ((ipha_t *)(iph))->ipha_type_of_service |= IPH_ECN_ECT0; \
 226         } else { \
 227                 ((ip6_t *)(iph))->ip6_vcf &= htonl(0xFFCFFFFF); \
 228                 ((ip6_t *)(iph))->ip6_vcf |= htonl(IPH_ECN_ECT0 << 20); \
 229         }
 230 
 231 /*
 232  * Set tcp_rto with boundary checking.
 233  */
 234 #define TCP_SET_RTO(tcp, rto) \
 235         if ((rto) < (tcp)->tcp_rto_min)                   \
 236                 (tcp)->tcp_rto = (tcp)->tcp_rto_min;      \
 237         else if ((rto) > (tcp)->tcp_rto_max)              \
 238                 (tcp)->tcp_rto = (tcp)->tcp_rto_max;      \
 239         else                                            \
 240                 (tcp)->tcp_rto = (rto);
 241 
 242 /*
 243  * TCP options struct returned from tcp_parse_options.
 244  */
 245 typedef struct tcp_opt_s {
 246         uint32_t        tcp_opt_mss;
 247         uint32_t        tcp_opt_wscale;
 248         uint32_t        tcp_opt_ts_val;
 249         uint32_t        tcp_opt_ts_ecr;
 250         tcp_t           *tcp;
 251 } tcp_opt_t;
 252 
 253 /*
 254  * Write-side flow-control is implemented via the per instance STREAMS
 255  * write-side Q by explicitly setting QFULL to stop the flow of mblk_t(s)
 256  * and clearing QFULL and calling qbackenable() to restart the flow based
 257  * on the number of TCP unsent bytes (i.e. those not on the wire waiting
 258  * for a remote ACK).
 259  *
 260  * This is different than a standard STREAMS kmod which when using the
 261  * STREAMS Q the framework would automatictly flow-control based on the
 262  * defined hiwat/lowat values as mblk_t's are enqueued/dequeued.
 263  *
 264  * As of FireEngine TCP write-side flow-control needs to take into account
 265  * both the unsent tcp_xmit list bytes but also any squeue_t enqueued bytes
 266  * (i.e. from tcp_wput() -> tcp_output()).
 267  *
 268  * This is accomplished by adding a new tcp_t fields, tcp_squeue_bytes, to
 269  * count the number of bytes enqueued by tcp_wput() and the number of bytes
 270  * dequeued and processed by tcp_output().
 271  *
 272  * So, the total number of bytes unsent is (squeue_bytes + unsent) with all
 273  * flow-control uses of unsent replaced with the macro TCP_UNSENT_BYTES.
 274  */
 275 extern void     tcp_clrqfull(tcp_t *);
 276 extern void     tcp_setqfull(tcp_t *);
 277 
 278 #define TCP_UNSENT_BYTES(tcp) \
 279         ((tcp)->tcp_squeue_bytes + (tcp)->tcp_unsent)
 280 
 281 /*
 282  * Linked list struct to store listener connection limit configuration per
 283  * IP stack.  The list is stored at tcps_listener_conf in tcp_stack_t.
 284  *
 285  * tl_port: the listener port of this limit configuration
 286  * tl_ratio: the maximum amount of memory consumed by all concurrent TCP
 287  *           connections created by a listener does not exceed 1/tl_ratio
 288  *           of the total system memory.  Note that this is only an
 289  *           approximation.
 290  * tl_link: linked list struct
 291  */
 292 typedef struct tcp_listener_s {
 293         in_port_t       tl_port;
 294         uint32_t        tl_ratio;
 295         list_node_t     tl_link;
 296 } tcp_listener_t;
 297 
 298 /*
 299  * If there is a limit set on the number of connections allowed per each
 300  * listener, the following struct is used to store that counter.  It keeps
 301  * the number of TCP connection created by a listener.  Note that this needs
 302  * to be separated from the listener since the listener can go away before
 303  * all the connections are gone.
 304  *
 305  * When the struct is allocated, tlc_cnt is set to 1.  When a new connection
 306  * is created by the listener, tlc_cnt is incremented by 1.  When a connection
 307  * created by the listener goes away, tlc_count is decremented by 1.  When the
 308  * listener itself goes away, tlc_cnt is decremented  by one.  The last
 309  * connection (or the listener) which decrements tlc_cnt to zero frees the
 310  * struct.
 311  *
 312  * tlc_max is the maximum number of concurrent TCP connections created from a
 313  * listner.  It is calculated when the tcp_listen_cnt_t is allocated.
 314  *
 315  * tlc_report_time stores the time when cmn_err() is called to report that the
 316  * max has been exceeeded.  Report is done at most once every
 317  * TCP_TLC_REPORT_INTERVAL mins for a listener.
 318  *
 319  * tlc_drop stores the number of connection attempt dropped because the
 320  * limit has reached.
 321  */
 322 typedef struct tcp_listen_cnt_s {
 323         uint32_t        tlc_max;
 324         uint32_t        tlc_cnt;
 325         int64_t         tlc_report_time;
 326         uint32_t        tlc_drop;
 327 } tcp_listen_cnt_t;
 328 
 329 #define TCP_TLC_REPORT_INTERVAL (30 * MINUTES)
 330 
 331 #define TCP_DECR_LISTEN_CNT(tcp)                                        \
 332 {                                                                       \
 333         ASSERT((tcp)->tcp_listen_cnt->tlc_cnt > 0);                    \
 334         if (atomic_add_32_nv(&(tcp)->tcp_listen_cnt->tlc_cnt, -1) == 0) \
 335                 kmem_free((tcp)->tcp_listen_cnt, sizeof (tcp_listen_cnt_t)); \
 336         (tcp)->tcp_listen_cnt = NULL;                                        \
 337 }
 338 
 339 /* Increment and decrement the number of connections in tcp_stack_t. */
 340 #define TCPS_CONN_INC(tcps)                                             \
 341         atomic_inc_64(                                                  \
 342             (uint64_t *)&(tcps)->tcps_sc[CPU->cpu_seqid]->tcp_sc_conn_cnt)
 343 
 344 #define TCPS_CONN_DEC(tcps)                                             \
 345         atomic_dec_64(                                                  \
 346             (uint64_t *)&(tcps)->tcps_sc[CPU->cpu_seqid]->tcp_sc_conn_cnt)
 347 
 348 /*
 349  * When the system is under memory pressure, stack variable tcps_reclaim is
 350  * true, we shorten the connection timeout abort interval to tcp_early_abort
 351  * seconds.  Defined in tcp.c.
 352  */
 353 extern uint32_t tcp_early_abort;
 354 
 355 /*
 356  * To reach to an eager in Q0 which can be dropped due to an incoming
 357  * new SYN request when Q0 is full, a new doubly linked list is
 358  * introduced. This list allows to select an eager from Q0 in O(1) time.
 359  * This is needed to avoid spending too much time walking through the
 360  * long list of eagers in Q0 when tcp_drop_q0() is called. Each member of
 361  * this new list has to be a member of Q0.
 362  * This list is headed by listener's tcp_t. When the list is empty,
 363  * both the pointers - tcp_eager_next_drop_q0 and tcp_eager_prev_drop_q0,
 364  * of listener's tcp_t point to listener's tcp_t itself.
 365  *
 366  * Given an eager in Q0 and a listener, MAKE_DROPPABLE() puts the eager
 367  * in the list. MAKE_UNDROPPABLE() takes the eager out of the list.
 368  * These macros do not affect the eager's membership to Q0.
 369  */
 370 #define MAKE_DROPPABLE(listener, eager)                                 \
 371         if ((eager)->tcp_eager_next_drop_q0 == NULL) {                       \
 372                 (listener)->tcp_eager_next_drop_q0->tcp_eager_prev_drop_q0\
 373                     = (eager);                                          \
 374                 (eager)->tcp_eager_prev_drop_q0 = (listener);                \
 375                 (eager)->tcp_eager_next_drop_q0 =                    \
 376                     (listener)->tcp_eager_next_drop_q0;                      \
 377                 (listener)->tcp_eager_next_drop_q0 = (eager);                \
 378         }
 379 
 380 #define MAKE_UNDROPPABLE(eager)                                         \
 381         if ((eager)->tcp_eager_next_drop_q0 != NULL) {                       \
 382                 (eager)->tcp_eager_next_drop_q0->tcp_eager_prev_drop_q0   \
 383                     = (eager)->tcp_eager_prev_drop_q0;                       \
 384                 (eager)->tcp_eager_prev_drop_q0->tcp_eager_next_drop_q0   \
 385                     = (eager)->tcp_eager_next_drop_q0;                       \
 386                 (eager)->tcp_eager_prev_drop_q0 = NULL;                      \
 387                 (eager)->tcp_eager_next_drop_q0 = NULL;                      \
 388         }
 389 
 390 /*
 391  * The format argument to pass to tcp_display().
 392  * DISP_PORT_ONLY means that the returned string has only port info.
 393  * DISP_ADDR_AND_PORT means that the returned string also contains the
 394  * remote and local IP address.
 395  */
 396 #define DISP_PORT_ONLY          1
 397 #define DISP_ADDR_AND_PORT      2
 398 
 399 #define IP_ADDR_CACHE_SIZE      2048
 400 #define IP_ADDR_CACHE_HASH(faddr)                                       \
 401         (ntohl(faddr) & (IP_ADDR_CACHE_SIZE -1))
 402 
 403 /* TCP cwnd burst factor. */
 404 #define TCP_CWND_INFINITE       65535
 405 #define TCP_CWND_SS             3
 406 #define TCP_CWND_NORMAL         5
 407 
 408 /*
 409  * TCP reassembly macros.  We hide starting and ending sequence numbers in
 410  * b_next and b_prev of messages on the reassembly queue.  The messages are
 411  * chained using b_cont.  These macros are used in tcp_reass() so we don't
 412  * have to see the ugly casts and assignments.
 413  */
 414 #define TCP_REASS_SEQ(mp)               ((uint32_t)(uintptr_t)((mp)->b_next))
 415 #define TCP_REASS_SET_SEQ(mp, u)        ((mp)->b_next = \
 416                                         (mblk_t *)(uintptr_t)(u))
 417 #define TCP_REASS_END(mp)               ((uint32_t)(uintptr_t)((mp)->b_prev))
 418 #define TCP_REASS_SET_END(mp, u)        ((mp)->b_prev = \
 419                                         (mblk_t *)(uintptr_t)(u))
 420 
 421 #define tcps_time_wait_interval         tcps_propinfo_tbl[0].prop_cur_uval
 422 #define tcps_conn_req_max_q             tcps_propinfo_tbl[1].prop_cur_uval
 423 #define tcps_conn_req_max_q0            tcps_propinfo_tbl[2].prop_cur_uval
 424 #define tcps_conn_req_min               tcps_propinfo_tbl[3].prop_cur_uval
 425 #define tcps_conn_grace_period          tcps_propinfo_tbl[4].prop_cur_uval
 426 #define tcps_cwnd_max_                  tcps_propinfo_tbl[5].prop_cur_uval
 427 #define tcps_dbg                        tcps_propinfo_tbl[6].prop_cur_uval
 428 #define tcps_smallest_nonpriv_port      tcps_propinfo_tbl[7].prop_cur_uval
 429 #define tcps_ip_abort_cinterval         tcps_propinfo_tbl[8].prop_cur_uval
 430 #define tcps_ip_abort_linterval         tcps_propinfo_tbl[9].prop_cur_uval
 431 #define tcps_ip_abort_interval          tcps_propinfo_tbl[10].prop_cur_uval
 432 #define tcps_ip_notify_cinterval        tcps_propinfo_tbl[11].prop_cur_uval
 433 #define tcps_ip_notify_interval         tcps_propinfo_tbl[12].prop_cur_uval
 434 #define tcps_ipv4_ttl                   tcps_propinfo_tbl[13].prop_cur_uval
 435 #define tcps_keepalive_interval_high    tcps_propinfo_tbl[14].prop_max_uval
 436 #define tcps_keepalive_interval         tcps_propinfo_tbl[14].prop_cur_uval
 437 #define tcps_keepalive_interval_low     tcps_propinfo_tbl[14].prop_min_uval
 438 #define tcps_maxpsz_multiplier          tcps_propinfo_tbl[15].prop_cur_uval
 439 #define tcps_mss_def_ipv4               tcps_propinfo_tbl[16].prop_cur_uval
 440 #define tcps_mss_max_ipv4               tcps_propinfo_tbl[17].prop_cur_uval
 441 #define tcps_mss_min                    tcps_propinfo_tbl[18].prop_cur_uval
 442 #define tcps_naglim_def                 tcps_propinfo_tbl[19].prop_cur_uval
 443 #define tcps_rexmit_interval_initial_high       \
 444                                         tcps_propinfo_tbl[20].prop_max_uval
 445 #define tcps_rexmit_interval_initial    tcps_propinfo_tbl[20].prop_cur_uval
 446 #define tcps_rexmit_interval_initial_low        \
 447                                         tcps_propinfo_tbl[20].prop_min_uval
 448 #define tcps_rexmit_interval_max_high   tcps_propinfo_tbl[21].prop_max_uval
 449 #define tcps_rexmit_interval_max        tcps_propinfo_tbl[21].prop_cur_uval
 450 #define tcps_rexmit_interval_max_low    tcps_propinfo_tbl[21].prop_min_uval
 451 #define tcps_rexmit_interval_min_high   tcps_propinfo_tbl[22].prop_max_uval
 452 #define tcps_rexmit_interval_min        tcps_propinfo_tbl[22].prop_cur_uval
 453 #define tcps_rexmit_interval_min_low    tcps_propinfo_tbl[22].prop_min_uval
 454 #define tcps_deferred_ack_interval      tcps_propinfo_tbl[23].prop_cur_uval
 455 #define tcps_snd_lowat_fraction         tcps_propinfo_tbl[24].prop_cur_uval
 456 #define tcps_dupack_fast_retransmit     tcps_propinfo_tbl[25].prop_cur_uval
 457 #define tcps_ignore_path_mtu            tcps_propinfo_tbl[26].prop_cur_bval
 458 #define tcps_smallest_anon_port         tcps_propinfo_tbl[27].prop_cur_uval
 459 #define tcps_largest_anon_port          tcps_propinfo_tbl[28].prop_cur_uval
 460 #define tcps_xmit_hiwat                 tcps_propinfo_tbl[29].prop_cur_uval
 461 #define tcps_xmit_lowat                 tcps_propinfo_tbl[30].prop_cur_uval
 462 #define tcps_recv_hiwat                 tcps_propinfo_tbl[31].prop_cur_uval
 463 #define tcps_recv_hiwat_minmss          tcps_propinfo_tbl[32].prop_cur_uval
 464 #define tcps_fin_wait_2_flush_interval_high     \
 465                                         tcps_propinfo_tbl[33].prop_max_uval
 466 #define tcps_fin_wait_2_flush_interval  tcps_propinfo_tbl[33].prop_cur_uval
 467 #define tcps_fin_wait_2_flush_interval_low      \
 468                                         tcps_propinfo_tbl[33].prop_min_uval
 469 #define tcps_max_buf                    tcps_propinfo_tbl[34].prop_cur_uval
 470 #define tcps_strong_iss                 tcps_propinfo_tbl[35].prop_cur_uval
 471 #define tcps_rtt_updates                tcps_propinfo_tbl[36].prop_cur_uval
 472 #define tcps_wscale_always              tcps_propinfo_tbl[37].prop_cur_bval
 473 #define tcps_tstamp_always              tcps_propinfo_tbl[38].prop_cur_bval
 474 #define tcps_tstamp_if_wscale           tcps_propinfo_tbl[39].prop_cur_bval
 475 #define tcps_rexmit_interval_extra      tcps_propinfo_tbl[40].prop_cur_uval
 476 #define tcps_deferred_acks_max          tcps_propinfo_tbl[41].prop_cur_uval
 477 #define tcps_slow_start_after_idle      tcps_propinfo_tbl[42].prop_cur_uval
 478 #define tcps_slow_start_initial         tcps_propinfo_tbl[43].prop_cur_uval
 479 #define tcps_sack_permitted             tcps_propinfo_tbl[44].prop_cur_uval
 480 #define tcps_ipv6_hoplimit              tcps_propinfo_tbl[45].prop_cur_uval
 481 #define tcps_mss_def_ipv6               tcps_propinfo_tbl[46].prop_cur_uval
 482 #define tcps_mss_max_ipv6               tcps_propinfo_tbl[47].prop_cur_uval
 483 #define tcps_rev_src_routes             tcps_propinfo_tbl[48].prop_cur_bval
 484 #define tcps_local_dack_interval        tcps_propinfo_tbl[49].prop_cur_uval
 485 #define tcps_local_dacks_max            tcps_propinfo_tbl[50].prop_cur_uval
 486 #define tcps_ecn_permitted              tcps_propinfo_tbl[51].prop_cur_uval
 487 #define tcps_rst_sent_rate_enabled      tcps_propinfo_tbl[52].prop_cur_bval
 488 #define tcps_rst_sent_rate              tcps_propinfo_tbl[53].prop_cur_uval
 489 #define tcps_push_timer_interval        tcps_propinfo_tbl[54].prop_cur_uval
 490 #define tcps_use_smss_as_mss_opt        tcps_propinfo_tbl[55].prop_cur_bval
 491 #define tcps_keepalive_abort_interval_high \
 492                                         tcps_propinfo_tbl[56].prop_max_uval
 493 #define tcps_keepalive_abort_interval \
 494                                         tcps_propinfo_tbl[56].prop_cur_uval
 495 #define tcps_keepalive_abort_interval_low \
 496                                         tcps_propinfo_tbl[56].prop_min_uval
 497 #define tcps_wroff_xtra                 tcps_propinfo_tbl[57].prop_cur_uval
 498 #define tcps_dev_flow_ctl               tcps_propinfo_tbl[58].prop_cur_bval
 499 #define tcps_reass_timeout              tcps_propinfo_tbl[59].prop_cur_uval
 500 #define tcps_iss_incr                   tcps_propinfo_tbl[65].prop_cur_uval
 501 
 502 extern struct qinit tcp_rinitv4, tcp_rinitv6;
 503 extern boolean_t do_tcp_fusion;
 504 
 505 /*
 506  * Object to represent database of options to search passed to
 507  * {sock,tpi}optcom_req() interface routine to take care of option
 508  * management and associated methods.
 509  */
 510 extern optdb_obj_t      tcp_opt_obj;
 511 extern uint_t           tcp_max_optsize;
 512 
 513 extern int tcp_squeue_flag;
 514 
 515 extern uint_t tcp_free_list_max_cnt;
 516 
 517 /*
 518  * Functions in tcp.c.
 519  */
 520 extern void     tcp_acceptor_hash_insert(t_uscalar_t, tcp_t *);
 521 extern tcp_t    *tcp_acceptor_hash_lookup(t_uscalar_t, tcp_stack_t *);
 522 extern void     tcp_acceptor_hash_remove(tcp_t *);
 523 extern mblk_t   *tcp_ack_mp(tcp_t *);
 524 extern int      tcp_build_hdrs(tcp_t *);
 525 extern void     tcp_cleanup(tcp_t *);
 526 extern int      tcp_clean_death(tcp_t *, int);
 527 extern void     tcp_clean_death_wrapper(void *, mblk_t *, void *,
 528                     ip_recv_attr_t *);
 529 extern void     tcp_close_common(conn_t *, int);
 530 extern void     tcp_close_detached(tcp_t *);
 531 extern void     tcp_close_mpp(mblk_t **);
 532 extern void     tcp_closei_local(tcp_t *);
 533 extern sock_lower_handle_t tcp_create(int, int, int, sock_downcalls_t **,
 534                     uint_t *, int *, int, cred_t *);
 535 extern conn_t   *tcp_create_common(cred_t *, boolean_t, boolean_t, int *);
 536 extern void     tcp_disconnect(tcp_t *, mblk_t *);
 537 extern char     *tcp_display(tcp_t *, char *, char);
 538 extern int      tcp_do_bind(conn_t *, struct sockaddr *, socklen_t, cred_t *,
 539                     boolean_t);
 540 extern int      tcp_do_connect(conn_t *, const struct sockaddr *, socklen_t,
 541                     cred_t *, pid_t);
 542 extern int      tcp_do_listen(conn_t *, struct sockaddr *, socklen_t, int,
 543                     cred_t *, boolean_t);
 544 extern int      tcp_do_unbind(conn_t *);
 545 extern boolean_t        tcp_eager_blowoff(tcp_t *, t_scalar_t);
 546 extern void     tcp_eager_cleanup(tcp_t *, boolean_t);
 547 extern void     tcp_eager_kill(void *, mblk_t *, void *, ip_recv_attr_t *);
 548 extern void     tcp_eager_unlink(tcp_t *);
 549 extern void     tcp_init_values(tcp_t *, tcp_t *);
 550 extern void     tcp_ipsec_cleanup(tcp_t *);
 551 extern int      tcp_maxpsz_set(tcp_t *, boolean_t);
 552 extern void     tcp_mss_set(tcp_t *, uint32_t);
 553 extern void     tcp_reinput(conn_t *, mblk_t *, ip_recv_attr_t *, ip_stack_t *);
 554 extern void     tcp_rsrv(queue_t *);
 555 extern uint_t   tcp_rwnd_reopen(tcp_t *);
 556 extern int      tcp_rwnd_set(tcp_t *, uint32_t);
 557 extern int      tcp_set_destination(tcp_t *);
 558 extern void     tcp_set_ws_value(tcp_t *);
 559 extern void     tcp_stop_lingering(tcp_t *);
 560 extern void     tcp_update_pmtu(tcp_t *, boolean_t);
 561 extern mblk_t   *tcp_zcopy_backoff(tcp_t *, mblk_t *, boolean_t);
 562 extern boolean_t        tcp_zcopy_check(tcp_t *);
 563 extern void     tcp_zcopy_notify(tcp_t *);
 564 extern void     tcp_get_proto_props(tcp_t *, struct sock_proto_props *);
 565 
 566 /*
 567  * Bind related functions in tcp_bind.c
 568  */
 569 extern int      tcp_bind_check(conn_t *, struct sockaddr *, socklen_t,
 570                     cred_t *, boolean_t);
 571 extern void     tcp_bind_hash_insert(tf_t *, tcp_t *, int);
 572 extern void     tcp_bind_hash_remove(tcp_t *);
 573 extern in_port_t        tcp_bindi(tcp_t *, in_port_t, const in6_addr_t *,
 574                             int, boolean_t, boolean_t, boolean_t);
 575 extern in_port_t        tcp_update_next_port(in_port_t, const tcp_t *,
 576                             boolean_t);
 577 
 578 /*
 579  * Fusion related functions in tcp_fusion.c.
 580  */
 581 extern void     tcp_fuse(tcp_t *, uchar_t *, tcpha_t *);
 582 extern void     tcp_unfuse(tcp_t *);
 583 extern boolean_t tcp_fuse_output(tcp_t *, mblk_t *, uint32_t);
 584 extern void     tcp_fuse_output_urg(tcp_t *, mblk_t *);
 585 extern boolean_t tcp_fuse_rcv_drain(queue_t *, tcp_t *, mblk_t **);
 586 extern size_t   tcp_fuse_set_rcv_hiwat(tcp_t *, size_t);
 587 extern int      tcp_fuse_maxpsz(tcp_t *);
 588 extern void     tcp_fuse_backenable(tcp_t *);
 589 extern void     tcp_iss_key_init(uint8_t *, int, tcp_stack_t *);
 590 
 591 /*
 592  * Output related functions in tcp_output.c.
 593  */
 594 extern void     tcp_close_output(void *, mblk_t *, void *, ip_recv_attr_t *);
 595 extern void     tcp_output(void *, mblk_t *, void *, ip_recv_attr_t *);
 596 extern void     tcp_output_urgent(void *, mblk_t *, void *, ip_recv_attr_t *);
 597 extern void     tcp_rexmit_after_error(tcp_t *);
 598 extern void     tcp_sack_rexmit(tcp_t *, uint_t *);
 599 extern void     tcp_send_data(tcp_t *, mblk_t *);
 600 extern void     tcp_send_synack(void *, mblk_t *, void *, ip_recv_attr_t *);
 601 extern void     tcp_shutdown_output(void *, mblk_t *, void *, ip_recv_attr_t *);
 602 extern void     tcp_ss_rexmit(tcp_t *);
 603 extern void     tcp_update_xmit_tail(tcp_t *, uint32_t);
 604 extern void     tcp_wput(queue_t *, mblk_t *);
 605 extern void     tcp_wput_data(tcp_t *, mblk_t *, boolean_t);
 606 extern void     tcp_wput_sock(queue_t *, mblk_t *);
 607 extern void     tcp_wput_fallback(queue_t *, mblk_t *);
 608 extern void     tcp_xmit_ctl(char *, tcp_t *, uint32_t, uint32_t, int);
 609 extern void     tcp_xmit_listeners_reset(mblk_t *, ip_recv_attr_t *,
 610                     ip_stack_t *i, conn_t *);
 611 extern mblk_t   *tcp_xmit_mp(tcp_t *, mblk_t *, int32_t, int32_t *,
 612                     mblk_t **, uint32_t, boolean_t, uint32_t *, boolean_t);
 613 
 614 /*
 615  * Input related functions in tcp_input.c.
 616  */
 617 extern void     tcp_icmp_input(void *, mblk_t *, void *, ip_recv_attr_t *);
 618 extern void     tcp_input_data(void *, mblk_t *, void *, ip_recv_attr_t *);
 619 extern void     tcp_input_listener_unbound(void *, mblk_t *, void *,
 620                     ip_recv_attr_t *);
 621 extern boolean_t        tcp_paws_check(tcp_t *, tcpha_t *, tcp_opt_t *);
 622 extern uint_t   tcp_rcv_drain(tcp_t *);
 623 extern void     tcp_rcv_enqueue(tcp_t *, mblk_t *, uint_t, cred_t *);
 624 extern boolean_t        tcp_verifyicmp(conn_t *, void *, icmph_t *, icmp6_t *,
 625                             ip_recv_attr_t *);
 626 
 627 /*
 628  * Kernel socket related functions in tcp_socket.c.
 629  */
 630 extern int      tcp_fallback(sock_lower_handle_t, queue_t *, boolean_t,
 631                     so_proto_quiesced_cb_t, sock_quiesce_arg_t *);
 632 extern boolean_t tcp_newconn_notify(tcp_t *, ip_recv_attr_t *);
 633 
 634 /*
 635  * Timer related functions in tcp_timers.c.
 636  */
 637 extern void     tcp_ack_timer(void *);
 638 extern void     tcp_close_linger_timeout(void *);
 639 extern void     tcp_keepalive_timer(void *);
 640 extern void     tcp_push_timer(void *);
 641 extern void     tcp_reass_timer(void *);
 642 extern mblk_t   *tcp_timermp_alloc(int);
 643 extern void     tcp_timermp_free(tcp_t *);
 644 extern timeout_id_t tcp_timeout(conn_t *, void (*)(void *), hrtime_t);
 645 extern clock_t  tcp_timeout_cancel(conn_t *, timeout_id_t);
 646 extern void     tcp_timer(void *arg);
 647 extern void     tcp_timers_stop(tcp_t *);
 648 
 649 /*
 650  * TCP TPI related functions in tcp_tpi.c.
 651  */
 652 extern void     tcp_addr_req(tcp_t *, mblk_t *);
 653 extern void     tcp_capability_req(tcp_t *, mblk_t *);
 654 extern boolean_t        tcp_conn_con(tcp_t *, uchar_t *, mblk_t *,
 655                             mblk_t **, ip_recv_attr_t *);
 656 extern void     tcp_err_ack(tcp_t *, mblk_t *, int, int);
 657 extern void     tcp_err_ack_prim(tcp_t *, mblk_t *, int, int, int);
 658 extern void     tcp_info_req(tcp_t *, mblk_t *);
 659 extern void     tcp_send_conn_ind(void *, mblk_t *, void *);
 660 extern void     tcp_send_pending(void *, mblk_t *, void *, ip_recv_attr_t *);
 661 extern void     tcp_tpi_accept(queue_t *, mblk_t *);
 662 extern void     tcp_tpi_bind(tcp_t *, mblk_t *);
 663 extern int      tcp_tpi_close(queue_t *, int);
 664 extern int      tcp_tpi_close_accept(queue_t *);
 665 extern void     tcp_tpi_connect(tcp_t *, mblk_t *);
 666 extern int      tcp_tpi_opt_get(queue_t *, t_scalar_t, t_scalar_t, uchar_t *);
 667 extern int      tcp_tpi_opt_set(queue_t *, uint_t, int, int, uint_t, uchar_t *,
 668                     uint_t *, uchar_t *, void *, cred_t *);
 669 extern void     tcp_tpi_unbind(tcp_t *, mblk_t *);
 670 extern void     tcp_tli_accept(tcp_t *, mblk_t *);
 671 extern void     tcp_use_pure_tpi(tcp_t *);
 672 extern void     tcp_do_capability_ack(tcp_t *, struct T_capability_ack *,
 673                     t_uscalar_t);
 674 
 675 /*
 676  * TCP option processing related functions in tcp_opt_data.c
 677  */
 678 extern int      tcp_opt_get(conn_t *, int, int, uchar_t *);
 679 extern int      tcp_opt_set(conn_t *, uint_t, int, int, uint_t, uchar_t *,
 680                     uint_t *, uchar_t *, void *, cred_t *);
 681 
 682 /*
 683  * TCP time wait processing related functions in tcp_time_wait.c.
 684  */
 685 extern void             tcp_time_wait_append(tcp_t *);
 686 extern void             tcp_time_wait_collector(void *);
 687 extern boolean_t        tcp_time_wait_remove(tcp_t *, tcp_squeue_priv_t *);
 688 extern void             tcp_time_wait_processing(tcp_t *, mblk_t *, uint32_t,
 689                             uint32_t, int, tcpha_t *, ip_recv_attr_t *);
 690 
 691 /*
 692  * Misc functions in tcp_misc.c.
 693  */
 694 extern uint32_t tcp_find_listener_conf(tcp_stack_t *, in_port_t);
 695 extern void     tcp_ioctl_abort_conn(queue_t *, mblk_t *);
 696 extern void     tcp_listener_conf_cleanup(tcp_stack_t *);
 697 extern void     tcp_stack_cpu_add(tcp_stack_t *, processorid_t);
 698 
 699 #endif  /* _KERNEL */
 700 
 701 #ifdef  __cplusplus
 702 }
 703 #endif
 704 
 705 #endif  /* _INET_TCP_IMPL_H */