sys/netinet/tcp_usrreq.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1982, 1986, 1988, 1993
   5  *      The Regents of the University of California.
   6  * Copyright (c) 2006-2007 Robert N. M. Watson
   7  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   8  * All rights reserved.
   9  *
  10  * Portions of this software were developed by Robert N. M. Watson under
  11  * contract to Juniper Networks, Inc.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      From: @(#)tcp_usrreq.c  8.2 (Berkeley) 1/3/94
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include "opt_ddb.h"
  44 #include "opt_inet.h"
  45 #include "opt_inet6.h"
  46 #include "opt_ipsec.h"
  47 #include "opt_kern_tls.h"
  48 #include "opt_tcpdebug.h"
  49
  50 #include <sys/param.h>
  51 #include <sys/systm.h>
  52 #include <sys/arb.h>
  53 #include <sys/limits.h>
  54 #include <sys/malloc.h>
  55 #include <sys/refcount.h>
  56 #include <sys/kernel.h>
  57 #include <sys/ktls.h>
  58 #include <sys/qmath.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/mbuf.h>
  61 #ifdef INET6
  62 #include <sys/domain.h>
  63 #endif /* INET6 */
  64 #include <sys/socket.h>
  65 #include <sys/socketvar.h>
  66 #include <sys/protosw.h>
  67 #include <sys/proc.h>
  68 #include <sys/jail.h>
  69 #include <sys/stats.h>
  70
  71 #ifdef DDB
  72 #include <ddb/ddb.h>
  73 #endif
  74
  75 #include <net/if.h>
  76 #include <net/if_var.h>
  77 #include <net/route.h>
  78 #include <net/vnet.h>
  79
  80 #include <netinet/in.h>
  81 #include <netinet/in_kdtrace.h>
  82 #include <netinet/in_pcb.h>
  83 #include <netinet/in_systm.h>
  84 #include <netinet/in_var.h>
  85 #include <netinet/ip_var.h>
  86 #ifdef INET6
  87 #include <netinet/ip6.h>
  88 #include <netinet6/in6_pcb.h>
  89 #include <netinet6/ip6_var.h>
  90 #include <netinet6/scope6_var.h>
  91 #endif
  92 #include <netinet/tcp.h>
  93 #include <netinet/tcp_fsm.h>
  94 #include <netinet/tcp_seq.h>
  95 #include <netinet/tcp_timer.h>
  96 #include <netinet/tcp_var.h>
  97 #include <netinet/tcp_log_buf.h>
  98 #include <netinet/tcpip.h>
  99 #include <netinet/cc/cc.h>
 100 #include <netinet/tcp_fastopen.h>
 101 #include <netinet/tcp_hpts.h>
 102 #ifdef TCPPCAP
 103 #include <netinet/tcp_pcap.h>
 104 #endif
 105 #ifdef TCPDEBUG
 106 #include <netinet/tcp_debug.h>
 107 #endif
 108 #ifdef TCP_OFFLOAD
 109 #include <netinet/tcp_offload.h>
 110 #endif
 111 #include <netipsec/ipsec_support.h>
 112
 113 #include <vm/vm.h>
 114 #include <vm/vm_param.h>
 115 #include <vm/pmap.h>
 116 #include <vm/vm_extern.h>
 117 #include <vm/vm_map.h>
 118 #include <vm/vm_page.h>
 119
 120 /*
 121  * TCP protocol interface to socket abstraction.
 122  */
 123 #ifdef INET
 124 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
 125                     struct thread *td);
 126 #endif /* INET */
 127 #ifdef INET6
 128 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
 129                     struct thread *td);
 130 #endif /* INET6 */
 131 static void     tcp_disconnect(struct tcpcb *);
 132 static void     tcp_usrclosed(struct tcpcb *);
 133 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 134
 135 static int      tcp_pru_options_support(struct tcpcb *tp, int flags);
 136
 137 #ifdef TCPDEBUG
 138 #define TCPDEBUG0       int ostate = 0
 139 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 140 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 141                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 142 #else
 143 #define TCPDEBUG0
 144 #define TCPDEBUG1()
 145 #define TCPDEBUG2(req)
 146 #endif
 147
 148 /*
 149  * tcp_require_unique port requires a globally-unique source port for each
 150  * outgoing connection.  The default is to require the 4-tuple to be unique.
 151  */
 152 VNET_DEFINE(int, tcp_require_unique_port) = 0;
 153 SYSCTL_INT(_net_inet_tcp, OID_AUTO, require_unique_port,
 154     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_require_unique_port), 0,
 155     "Require globally-unique ephemeral port for outgoing connections");
 156 #define V_tcp_require_unique_port       VNET(tcp_require_unique_port)
 157
 158 /*
 159  * TCP attaches to socket via pru_attach(), reserving space,
 160  * and an internet control block.
 161  */
 162 static int
 163 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 164 {
 165         struct inpcb *inp;
 166         struct tcpcb *tp = NULL;
 167         int error;
 168         TCPDEBUG0;
 169
 170         inp = sotoinpcb(so);
 171         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 172         TCPDEBUG1();
 173
 174         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 175                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
 176                 if (error)
 177                         goto out;
 178         }
 179
 180         so->so_rcv.sb_flags |= SB_AUTOSIZE;
 181         so->so_snd.sb_flags |= SB_AUTOSIZE;
 182         error = in_pcballoc(so, &V_tcbinfo);
 183         if (error)
 184                 goto out;
 185         inp = sotoinpcb(so);
 186 #ifdef INET6
 187         if (inp->inp_vflag & INP_IPV6PROTO) {
 188                 inp->inp_vflag |= INP_IPV6;
 189                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 190                         inp->inp_vflag |= INP_IPV4;
 191                 inp->in6p_hops = -1;    /* use kernel default */
 192         }
 193         else
 194 #endif
 195                 inp->inp_vflag |= INP_IPV4;
 196         tp = tcp_newtcpcb(inp);
 197         if (tp == NULL) {
 198                 error = ENOBUFS;
 199                 in_pcbdetach(inp);
 200                 in_pcbfree(inp);
 201                 goto out;
 202         }
 203         tp->t_state = TCPS_CLOSED;
 204         INP_WUNLOCK(inp);
 205         TCPSTATES_INC(TCPS_CLOSED);
 206 out:
 207         TCPDEBUG2(PRU_ATTACH);
 208         TCP_PROBE2(debug__user, tp, PRU_ATTACH);
 209         return (error);
 210 }
 211
 212 /*
 213  * tcp_usr_detach is called when the socket layer loses its final reference
 214  * to the socket, be it a file descriptor reference, a reference from TCP,
 215  * etc.  At this point, there is only one case in which we will keep around
 216  * inpcb state: time wait.
 217  */
 218 static void
 219 tcp_usr_detach(struct socket *so)
 220 {
 221         struct inpcb *inp;
 222         struct tcpcb *tp;
 223
 224         inp = sotoinpcb(so);
 225         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 226         INP_WLOCK(inp);
 227         KASSERT(so->so_pcb == inp && inp->inp_socket == so,
 228                 ("%s: socket %p inp %p mismatch", __func__, so, inp));
 229
 230         tp = intotcpcb(inp);
 231
 232         if (inp->inp_flags & INP_TIMEWAIT) {
 233                 /*
 234                  * There are two cases to handle: one in which the time wait
 235                  * state is being discarded (INP_DROPPED), and one in which
 236                  * this connection will remain in timewait.  In the former,
 237                  * it is time to discard all state (except tcptw, which has
 238                  * already been discarded by the timewait close code, which
 239                  * should be further up the call stack somewhere).  In the
 240                  * latter case, we detach from the socket, but leave the pcb
 241                  * present until timewait ends.
 242                  *
 243                  * XXXRW: Would it be cleaner to free the tcptw here?
 244                  *
 245                  * Astute question indeed, from twtcp perspective there are
 246                  * four cases to consider:
 247                  *
 248                  * #1 tcp_usr_detach is called at tcptw creation time by
 249                  *  tcp_twstart, then do not discard the newly created tcptw
 250                  *  and leave inpcb present until timewait ends
 251                  * #2 tcp_usr_detach is called at tcptw creation time by
 252                  *  tcp_twstart, but connection is local and tw will be
 253                  *  discarded immediately
 254                  * #3 tcp_usr_detach is called at timewait end (or reuse) by
 255                  *  tcp_twclose, then the tcptw has already been discarded
 256                  *  (or reused) and inpcb is freed here
 257                  * #4 tcp_usr_detach is called() after timewait ends (or reuse)
 258                  *  (e.g. by soclose), then tcptw has already been discarded
 259                  *  (or reused) and inpcb is freed here
 260                  *
 261                  *  In all three cases the tcptw should not be freed here.
 262                  */
 263                 if (inp->inp_flags & INP_DROPPED) {
 264                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 265                             "INP_DROPPED && tp != NULL"));
 266                         in_pcbdetach(inp);
 267                         in_pcbfree(inp);
 268                 } else {
 269                         in_pcbdetach(inp);
 270                         INP_WUNLOCK(inp);
 271                 }
 272         } else {
 273                 /*
 274                  * If the connection is not in timewait, we consider two
 275                  * two conditions: one in which no further processing is
 276                  * necessary (dropped || embryonic), and one in which TCP is
 277                  * not yet done, but no longer requires the socket, so the
 278                  * pcb will persist for the time being.
 279                  *
 280                  * XXXRW: Does the second case still occur?
 281                  */
 282                 if (inp->inp_flags & INP_DROPPED ||
 283                     tp->t_state < TCPS_SYN_SENT) {
 284                         tcp_discardcb(tp);
 285                         in_pcbdetach(inp);
 286                         in_pcbfree(inp);
 287                 } else {
 288                         in_pcbdetach(inp);
 289                         INP_WUNLOCK(inp);
 290                 }
 291         }
 292 }
 293
 294 #ifdef INET
 295 /*
 296  * Give the socket an address.
 297  */
 298 static int
 299 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 300 {
 301         int error = 0;
 302         struct inpcb *inp;
 303         struct tcpcb *tp = NULL;
 304         struct sockaddr_in *sinp;
 305
 306         sinp = (struct sockaddr_in *)nam;
 307         if (nam->sa_family != AF_INET) {
 308                 /*
 309                  * Preserve compatibility with old programs.
 310                  */
 311                 if (nam->sa_family != AF_UNSPEC ||
 312                     nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
 313                     sinp->sin_addr.s_addr != INADDR_ANY)
 314                         return (EAFNOSUPPORT);
 315                 nam->sa_family = AF_INET;
 316         }
 317         if (nam->sa_len != sizeof(*sinp))
 318                 return (EINVAL);
 319
 320         /*
 321          * Must check for multicast addresses and disallow binding
 322          * to them.
 323          */
 324         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 325                 return (EAFNOSUPPORT);
 326
 327         TCPDEBUG0;
 328         inp = sotoinpcb(so);
 329         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 330         INP_WLOCK(inp);
 331         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 332                 error = EINVAL;
 333                 goto out;
 334         }
 335         tp = intotcpcb(inp);
 336         TCPDEBUG1();
 337         INP_HASH_WLOCK(&V_tcbinfo);
 338         error = in_pcbbind(inp, nam, td->td_ucred);
 339         INP_HASH_WUNLOCK(&V_tcbinfo);
 340 out:
 341         TCPDEBUG2(PRU_BIND);
 342         TCP_PROBE2(debug__user, tp, PRU_BIND);
 343         INP_WUNLOCK(inp);
 344
 345         return (error);
 346 }
 347 #endif /* INET */
 348
 349 #ifdef INET6
 350 static int
 351 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 352 {
 353         int error = 0;
 354         struct inpcb *inp;
 355         struct tcpcb *tp = NULL;
 356         struct sockaddr_in6 *sin6;
 357         u_char vflagsav;
 358
 359         sin6 = (struct sockaddr_in6 *)nam;
 360         if (nam->sa_family != AF_INET6)
 361                 return (EAFNOSUPPORT);
 362         if (nam->sa_len != sizeof(*sin6))
 363                 return (EINVAL);
 364
 365         /*
 366          * Must check for multicast addresses and disallow binding
 367          * to them.
 368          */
 369         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 370                 return (EAFNOSUPPORT);
 371
 372         TCPDEBUG0;
 373         inp = sotoinpcb(so);
 374         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 375         INP_WLOCK(inp);
 376         vflagsav = inp->inp_vflag;
 377         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 378                 error = EINVAL;
 379                 goto out;
 380         }
 381         tp = intotcpcb(inp);
 382         TCPDEBUG1();
 383         INP_HASH_WLOCK(&V_tcbinfo);
 384         inp->inp_vflag &= ~INP_IPV4;
 385         inp->inp_vflag |= INP_IPV6;
 386 #ifdef INET
 387         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 388                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 389                         inp->inp_vflag |= INP_IPV4;
 390                 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 391                         struct sockaddr_in sin;
 392
 393                         in6_sin6_2_sin(&sin, sin6);
 394                         if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 395                                 error = EAFNOSUPPORT;
 396                                 INP_HASH_WUNLOCK(&V_tcbinfo);
 397                                 goto out;
 398                         }
 399                         inp->inp_vflag |= INP_IPV4;
 400                         inp->inp_vflag &= ~INP_IPV6;
 401                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 402                             td->td_ucred);
 403                         INP_HASH_WUNLOCK(&V_tcbinfo);
 404                         goto out;
 405                 }
 406         }
 407 #endif
 408         error = in6_pcbbind(inp, nam, td->td_ucred);
 409         INP_HASH_WUNLOCK(&V_tcbinfo);
 410 out:
 411         if (error != 0)
 412                 inp->inp_vflag = vflagsav;
 413         TCPDEBUG2(PRU_BIND);
 414         TCP_PROBE2(debug__user, tp, PRU_BIND);
 415         INP_WUNLOCK(inp);
 416         return (error);
 417 }
 418 #endif /* INET6 */
 419
 420 #ifdef INET
 421 /*
 422  * Prepare to accept connections.
 423  */
 424 static int
 425 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 426 {
 427         int error = 0;
 428         struct inpcb *inp;
 429         struct tcpcb *tp = NULL;
 430
 431         TCPDEBUG0;
 432         inp = sotoinpcb(so);
 433         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 434         INP_WLOCK(inp);
 435         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 436                 error = EINVAL;
 437                 goto out;
 438         }
 439         tp = intotcpcb(inp);
 440         TCPDEBUG1();
 441         SOCK_LOCK(so);
 442         error = solisten_proto_check(so);
 443         if (error != 0) {
 444                 SOCK_UNLOCK(so);
 445                 goto out;
 446         }
 447         if (inp->inp_lport == 0) {
 448                 INP_HASH_WLOCK(&V_tcbinfo);
 449                 error = in_pcbbind(inp, NULL, td->td_ucred);
 450                 INP_HASH_WUNLOCK(&V_tcbinfo);
 451         }
 452         if (error == 0) {
 453                 tcp_state_change(tp, TCPS_LISTEN);
 454                 solisten_proto(so, backlog);
 455 #ifdef TCP_OFFLOAD
 456                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 457                         tcp_offload_listen_start(tp);
 458 #endif
 459         } else {
 460                 solisten_proto_abort(so);
 461         }
 462         SOCK_UNLOCK(so);
 463
 464         if (IS_FASTOPEN(tp->t_flags))
 465                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 466
 467 out:
 468         TCPDEBUG2(PRU_LISTEN);
 469         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 470         INP_WUNLOCK(inp);
 471         return (error);
 472 }
 473 #endif /* INET */
 474
 475 #ifdef INET6
 476 static int
 477 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 478 {
 479         int error = 0;
 480         struct inpcb *inp;
 481         struct tcpcb *tp = NULL;
 482         u_char vflagsav;
 483
 484         TCPDEBUG0;
 485         inp = sotoinpcb(so);
 486         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 487         INP_WLOCK(inp);
 488         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 489                 error = EINVAL;
 490                 goto out;
 491         }
 492         vflagsav = inp->inp_vflag;
 493         tp = intotcpcb(inp);
 494         TCPDEBUG1();
 495         SOCK_LOCK(so);
 496         error = solisten_proto_check(so);
 497         if (error != 0) {
 498                 SOCK_UNLOCK(so);
 499                 goto out;
 500         }
 501         INP_HASH_WLOCK(&V_tcbinfo);
 502         if (inp->inp_lport == 0) {
 503                 inp->inp_vflag &= ~INP_IPV4;
 504                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 505                         inp->inp_vflag |= INP_IPV4;
 506                 error = in6_pcbbind(inp, NULL, td->td_ucred);
 507         }
 508         INP_HASH_WUNLOCK(&V_tcbinfo);
 509         if (error == 0) {
 510                 tcp_state_change(tp, TCPS_LISTEN);
 511                 solisten_proto(so, backlog);
 512 #ifdef TCP_OFFLOAD
 513                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 514                         tcp_offload_listen_start(tp);
 515 #endif
 516         } else {
 517                 solisten_proto_abort(so);
 518         }
 519         SOCK_UNLOCK(so);
 520
 521         if (IS_FASTOPEN(tp->t_flags))
 522                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 523
 524         if (error != 0)
 525                 inp->inp_vflag = vflagsav;
 526
 527 out:
 528         TCPDEBUG2(PRU_LISTEN);
 529         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 530         INP_WUNLOCK(inp);
 531         return (error);
 532 }
 533 #endif /* INET6 */
 534
 535 #ifdef INET
 536 /*
 537  * Initiate connection to peer.
 538  * Create a template for use in transmissions on this connection.
 539  * Enter SYN_SENT state, and mark socket as connecting.
 540  * Start keep-alive timer, and seed output sequence space.
 541  * Send initial segment on connection.
 542  */
 543 static int
 544 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 545 {
 546         struct epoch_tracker et;
 547         int error = 0;
 548         struct inpcb *inp;
 549         struct tcpcb *tp = NULL;
 550         struct sockaddr_in *sinp;
 551
 552         sinp = (struct sockaddr_in *)nam;
 553         if (nam->sa_family != AF_INET)
 554                 return (EAFNOSUPPORT);
 555         if (nam->sa_len != sizeof (*sinp))
 556                 return (EINVAL);
 557
 558         /*
 559          * Must disallow TCP ``connections'' to multicast addresses.
 560          */
 561         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 562                 return (EAFNOSUPPORT);
 563         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST)
 564                 return (EACCES);
 565         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 566                 return (error);
 567
 568         TCPDEBUG0;
 569         inp = sotoinpcb(so);
 570         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 571         INP_WLOCK(inp);
 572         if (inp->inp_flags & INP_TIMEWAIT) {
 573                 error = EADDRINUSE;
 574                 goto out;
 575         }
 576         if (inp->inp_flags & INP_DROPPED) {
 577                 error = ECONNREFUSED;
 578                 goto out;
 579         }
 580         if (SOLISTENING(so)) {
 581                 error = EOPNOTSUPP;
 582                 goto out;
 583         }
 584         tp = intotcpcb(inp);
 585         TCPDEBUG1();
 586         NET_EPOCH_ENTER(et);
 587         if ((error = tcp_connect(tp, nam, td)) != 0)
 588                 goto out_in_epoch;
 589 #ifdef TCP_OFFLOAD
 590         if (registered_toedevs > 0 &&
 591             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 592             (error = tcp_offload_connect(so, nam)) == 0)
 593                 goto out_in_epoch;
 594 #endif
 595         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 596         error = tcp_output(tp);
 597         KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()",
 598             tp->t_fb->tfb_tcp_block_name, tp));
 599 out_in_epoch:
 600         NET_EPOCH_EXIT(et);
 601 out:
 602         TCPDEBUG2(PRU_CONNECT);
 603         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 604         INP_WUNLOCK(inp);
 605         return (error);
 606 }
 607 #endif /* INET */
 608
 609 #ifdef INET6
 610 static int
 611 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 612 {
 613         struct epoch_tracker et;
 614         int error = 0;
 615         struct inpcb *inp;
 616         struct tcpcb *tp = NULL;
 617         struct sockaddr_in6 *sin6;
 618         u_int8_t incflagsav;
 619         u_char vflagsav;
 620
 621         TCPDEBUG0;
 622
 623         sin6 = (struct sockaddr_in6 *)nam;
 624         if (nam->sa_family != AF_INET6)
 625                 return (EAFNOSUPPORT);
 626         if (nam->sa_len != sizeof (*sin6))
 627                 return (EINVAL);
 628
 629         /*
 630          * Must disallow TCP ``connections'' to multicast addresses.
 631          */
 632         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 633                 return (EAFNOSUPPORT);
 634
 635         inp = sotoinpcb(so);
 636         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 637         INP_WLOCK(inp);
 638         vflagsav = inp->inp_vflag;
 639         incflagsav = inp->inp_inc.inc_flags;
 640         if (inp->inp_flags & INP_TIMEWAIT) {
 641                 error = EADDRINUSE;
 642                 goto out;
 643         }
 644         if (inp->inp_flags & INP_DROPPED) {
 645                 error = ECONNREFUSED;
 646                 goto out;
 647         }
 648         if (SOLISTENING(so)) {
 649                 error = EINVAL;
 650                 goto out;
 651         }
 652         tp = intotcpcb(inp);
 653         TCPDEBUG1();
 654 #ifdef INET
 655         /*
 656          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 657          * therefore probably require the hash lock, which isn't held here.
 658          * Is this a significant problem?
 659          */
 660         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 661                 struct sockaddr_in sin;
 662
 663                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 664                         error = EINVAL;
 665                         goto out;
 666                 }
 667                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 668                         error = EAFNOSUPPORT;
 669                         goto out;
 670                 }
 671
 672                 in6_sin6_2_sin(&sin, sin6);
 673                 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 674                         error = EAFNOSUPPORT;
 675                         goto out;
 676                 }
 677                 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) {
 678                         error = EACCES;
 679                         goto out;
 680                 }
 681                 if ((error = prison_remote_ip4(td->td_ucred,
 682                     &sin.sin_addr)) != 0)
 683                         goto out;
 684                 inp->inp_vflag |= INP_IPV4;
 685                 inp->inp_vflag &= ~INP_IPV6;
 686                 NET_EPOCH_ENTER(et);
 687                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 688                         goto out_in_epoch;
 689 #ifdef TCP_OFFLOAD
 690                 if (registered_toedevs > 0 &&
 691                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 692                     (error = tcp_offload_connect(so, nam)) == 0)
 693                         goto out_in_epoch;
 694 #endif
 695                 error = tcp_output(tp);
 696                 goto out_in_epoch;
 697         } else {
 698                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 699                         error = EAFNOSUPPORT;
 700                         goto out;
 701                 }
 702         }
 703 #endif
 704         if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
 705                 goto out;
 706         inp->inp_vflag &= ~INP_IPV4;
 707         inp->inp_vflag |= INP_IPV6;
 708         inp->inp_inc.inc_flags |= INC_ISIPV6;
 709         if ((error = tcp6_connect(tp, nam, td)) != 0)
 710                 goto out;
 711 #ifdef TCP_OFFLOAD
 712         if (registered_toedevs > 0 &&
 713             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 714             (error = tcp_offload_connect(so, nam)) == 0)
 715                 goto out;
 716 #endif
 717         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 718         NET_EPOCH_ENTER(et);
 719         error = tcp_output(tp);
 720 #ifdef INET
 721 out_in_epoch:
 722 #endif
 723         NET_EPOCH_EXIT(et);
 724 out:
 725         KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()",
 726             tp->t_fb->tfb_tcp_block_name, tp));
 727         /*
 728          * If the implicit bind in the connect call fails, restore
 729          * the flags we modified.
 730          */
 731         if (error != 0 && inp->inp_lport == 0) {
 732                 inp->inp_vflag = vflagsav;
 733                 inp->inp_inc.inc_flags = incflagsav;
 734         }
 735
 736         TCPDEBUG2(PRU_CONNECT);
 737         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 738         INP_WUNLOCK(inp);
 739         return (error);
 740 }
 741 #endif /* INET6 */
 742
 743 /*
 744  * Initiate disconnect from peer.
 745  * If connection never passed embryonic stage, just drop;
 746  * else if don't need to let data drain, then can just drop anyways,
 747  * else have to begin TCP shutdown process: mark socket disconnecting,
 748  * drain unread data, state switch to reflect user close, and
 749  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 750  * when peer sends FIN and acks ours.
 751  *
 752  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 753  */
 754 static int
 755 tcp_usr_disconnect(struct socket *so)
 756 {
 757         struct inpcb *inp;
 758         struct tcpcb *tp = NULL;
 759         struct epoch_tracker et;
 760         int error = 0;
 761
 762         TCPDEBUG0;
 763         NET_EPOCH_ENTER(et);
 764         inp = sotoinpcb(so);
 765         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 766         INP_WLOCK(inp);
 767         if (inp->inp_flags & INP_TIMEWAIT)
 768                 goto out;
 769         if (inp->inp_flags & INP_DROPPED) {
 770                 error = ECONNRESET;
 771                 goto out;
 772         }
 773         tp = intotcpcb(inp);
 774         TCPDEBUG1();
 775         tcp_disconnect(tp);
 776 out:
 777         TCPDEBUG2(PRU_DISCONNECT);
 778         TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
 779         INP_WUNLOCK(inp);
 780         NET_EPOCH_EXIT(et);
 781         return (error);
 782 }
 783
 784 #ifdef INET
 785 /*
 786  * Accept a connection.  Essentially all the work is done at higher levels;
 787  * just return the address of the peer, storing through addr.
 788  */
 789 static int
 790 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 791 {
 792         int error = 0;
 793         struct inpcb *inp = NULL;
 794         struct tcpcb *tp = NULL;
 795         struct in_addr addr;
 796         in_port_t port = 0;
 797         TCPDEBUG0;
 798
 799         if (so->so_state & SS_ISDISCONNECTED)
 800                 return (ECONNABORTED);
 801
 802         inp = sotoinpcb(so);
 803         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 804         INP_WLOCK(inp);
 805         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 806                 error = ECONNABORTED;
 807                 goto out;
 808         }
 809         tp = intotcpcb(inp);
 810         TCPDEBUG1();
 811
 812         /*
 813          * We inline in_getpeeraddr and COMMON_END here, so that we can
 814          * copy the data of interest and defer the malloc until after we
 815          * release the lock.
 816          */
 817         port = inp->inp_fport;
 818         addr = inp->inp_faddr;
 819
 820 out:
 821         TCPDEBUG2(PRU_ACCEPT);
 822         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 823         INP_WUNLOCK(inp);
 824         if (error == 0)
 825                 *nam = in_sockaddr(port, &addr);
 826         return error;
 827 }
 828 #endif /* INET */
 829
 830 #ifdef INET6
 831 static int
 832 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 833 {
 834         struct inpcb *inp = NULL;
 835         int error = 0;
 836         struct tcpcb *tp = NULL;
 837         struct in_addr addr;
 838         struct in6_addr addr6;
 839         struct epoch_tracker et;
 840         in_port_t port = 0;
 841         int v4 = 0;
 842         TCPDEBUG0;
 843
 844         if (so->so_state & SS_ISDISCONNECTED)
 845                 return (ECONNABORTED);
 846
 847         inp = sotoinpcb(so);
 848         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 849         NET_EPOCH_ENTER(et);
 850         INP_WLOCK(inp);
 851         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 852                 error = ECONNABORTED;
 853                 goto out;
 854         }
 855         tp = intotcpcb(inp);
 856         TCPDEBUG1();
 857
 858         /*
 859          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 860          * copy the data of interest and defer the malloc until after we
 861          * release the lock.
 862          */
 863         if (inp->inp_vflag & INP_IPV4) {
 864                 v4 = 1;
 865                 port = inp->inp_fport;
 866                 addr = inp->inp_faddr;
 867         } else {
 868                 port = inp->inp_fport;
 869                 addr6 = inp->in6p_faddr;
 870         }
 871
 872 out:
 873         TCPDEBUG2(PRU_ACCEPT);
 874         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 875         INP_WUNLOCK(inp);
 876         NET_EPOCH_EXIT(et);
 877         if (error == 0) {
 878                 if (v4)
 879                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 880                 else
 881                         *nam = in6_sockaddr(port, &addr6);
 882         }
 883         return error;
 884 }
 885 #endif /* INET6 */
 886
 887 /*
 888  * Mark the connection as being incapable of further output.
 889  */
 890 static int
 891 tcp_usr_shutdown(struct socket *so)
 892 {
 893         int error = 0;
 894         struct inpcb *inp;
 895         struct tcpcb *tp = NULL;
 896         struct epoch_tracker et;
 897
 898         TCPDEBUG0;
 899         inp = sotoinpcb(so);
 900         KASSERT(inp != NULL, ("inp == NULL"));
 901         INP_WLOCK(inp);
 902         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 903                 INP_WUNLOCK(inp);
 904                 return (ECONNRESET);
 905         }
 906         tp = intotcpcb(inp);
 907         NET_EPOCH_ENTER(et);
 908         TCPDEBUG1();
 909         socantsendmore(so);
 910         tcp_usrclosed(tp);
 911         if (!(inp->inp_flags & INP_DROPPED))
 912                 error = tcp_output_nodrop(tp);
 913         TCPDEBUG2(PRU_SHUTDOWN);
 914         TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
 915         error = tcp_unlock_or_drop(tp, error);
 916         NET_EPOCH_EXIT(et);
 917
 918         return (error);
 919 }
 920
 921 /*
 922  * After a receive, possibly send window update to peer.
 923  */
 924 static int
 925 tcp_usr_rcvd(struct socket *so, int flags)
 926 {
 927         struct epoch_tracker et;
 928         struct inpcb *inp;
 929         struct tcpcb *tp = NULL;
 930         int outrv = 0, error = 0;
 931
 932         TCPDEBUG0;
 933         inp = sotoinpcb(so);
 934         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 935         INP_WLOCK(inp);
 936         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 937                 INP_WUNLOCK(inp);
 938                 return (ECONNRESET);
 939         }
 940         tp = intotcpcb(inp);
 941         NET_EPOCH_ENTER(et);
 942         TCPDEBUG1();
 943         /*
 944          * For passively-created TFO connections, don't attempt a window
 945          * update while still in SYN_RECEIVED as this may trigger an early
 946          * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
 947          * application response data, or failing that, when the DELACK timer
 948          * expires.
 949          */
 950         if (IS_FASTOPEN(tp->t_flags) &&
 951             (tp->t_state == TCPS_SYN_RECEIVED))
 952                 goto out;
 953 #ifdef TCP_OFFLOAD
 954         if (tp->t_flags & TF_TOE)
 955                 tcp_offload_rcvd(tp);
 956         else
 957 #endif
 958                 outrv = tcp_output_nodrop(tp);
 959 out:
 960         TCPDEBUG2(PRU_RCVD);
 961         TCP_PROBE2(debug__user, tp, PRU_RCVD);
 962         (void) tcp_unlock_or_drop(tp, outrv);
 963         NET_EPOCH_EXIT(et);
 964         return (error);
 965 }
 966
 967 /*
 968  * Do a send by putting data in output queue and updating urgent
 969  * marker if URG set.  Possibly send more data.  Unlike the other
 970  * pru_*() routines, the mbuf chains are our responsibility.  We
 971  * must either enqueue them or free them.  The other pru_* routines
 972  * generally are caller-frees.
 973  */
 974 static int
 975 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 976     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 977 {
 978         struct epoch_tracker et;
 979         int error = 0;
 980         struct inpcb *inp;
 981         struct tcpcb *tp = NULL;
 982 #ifdef INET
 983 #ifdef INET6
 984         struct sockaddr_in sin;
 985 #endif
 986         struct sockaddr_in *sinp;
 987 #endif
 988 #ifdef INET6
 989         int isipv6;
 990 #endif
 991         u_int8_t incflagsav;
 992         u_char vflagsav;
 993         bool restoreflags;
 994         TCPDEBUG0;
 995
 996         /*
 997          * We require the pcbinfo "read lock" if we will close the socket
 998          * as part of this call.
 999          */
1000         NET_EPOCH_ENTER(et);
1001         inp = sotoinpcb(so);
1002         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
1003         INP_WLOCK(inp);
1004         tp = intotcpcb(inp);
1005         vflagsav = inp->inp_vflag;
1006         incflagsav = inp->inp_inc.inc_flags;
1007         restoreflags = false;
1008         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1009                 if (control)
1010                         m_freem(control);
1011                 error = ECONNRESET;
1012                 goto out;
1013         }
1014         if (control != NULL) {
1015                 /* TCP doesn't do control messages (rights, creds, etc) */
1016                 if (control->m_len) {
1017                         m_freem(control);
1018                         error = EINVAL;
1019                         goto out;
1020                 }
1021                 m_freem(control);       /* empty control, just free it */
1022                 control = NULL;
1023         }
1024         if ((flags & PRUS_OOB) != 0 &&
1025             (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
1026                 goto out;
1027
1028         TCPDEBUG1();
1029         if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
1030                 if (tp->t_state == TCPS_LISTEN) {
1031                         error = EINVAL;
1032                         goto out;
1033                 }
1034                 switch (nam->sa_family) {
1035 #ifdef INET
1036                 case AF_INET:
1037                         sinp = (struct sockaddr_in *)nam;
1038                         if (sinp->sin_len != sizeof(struct sockaddr_in)) {
1039                                 error = EINVAL;
1040                                 goto out;
1041                         }
1042                         if ((inp->inp_vflag & INP_IPV6) != 0) {
1043                                 error = EAFNOSUPPORT;
1044                                 goto out;
1045                         }
1046                         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
1047                                 error = EAFNOSUPPORT;
1048                                 goto out;
1049                         }
1050                         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
1051                                 error = EACCES;
1052                                 goto out;
1053                         }
1054                         if ((error = prison_remote_ip4(td->td_ucred,
1055                             &sinp->sin_addr)))
1056                                 goto out;
1057 #ifdef INET6
1058                         isipv6 = 0;
1059 #endif
1060                         break;
1061 #endif /* INET */
1062 #ifdef INET6
1063                 case AF_INET6:
1064                 {
1065                         struct sockaddr_in6 *sin6;
1066
1067                         sin6 = (struct sockaddr_in6 *)nam;
1068                         if (sin6->sin6_len != sizeof(*sin6)) {
1069                                 error = EINVAL;
1070                                 goto out;
1071                         }
1072                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1073                                 error = EAFNOSUPPORT;
1074                                 goto out;
1075                         }
1076                         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1077                                 error = EAFNOSUPPORT;
1078                                 goto out;
1079                         }
1080                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1081 #ifdef INET
1082                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1083                                         error = EINVAL;
1084                                         goto out;
1085                                 }
1086                                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1087                                         error = EAFNOSUPPORT;
1088                                         goto out;
1089                                 }
1090                                 restoreflags = true;
1091                                 inp->inp_vflag &= ~INP_IPV6;
1092                                 sinp = &sin;
1093                                 in6_sin6_2_sin(sinp, sin6);
1094                                 if (IN_MULTICAST(
1095                                     ntohl(sinp->sin_addr.s_addr))) {
1096                                         error = EAFNOSUPPORT;
1097                                         goto out;
1098                                 }
1099                                 if ((error = prison_remote_ip4(td->td_ucred,
1100                                     &sinp->sin_addr)))
1101                                         goto out;
1102                                 isipv6 = 0;
1103 #else /* !INET */
1104                                 error = EAFNOSUPPORT;
1105                                 goto out;
1106 #endif /* INET */
1107                         } else {
1108                                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1109                                         error = EAFNOSUPPORT;
1110                                         goto out;
1111                                 }
1112                                 restoreflags = true;
1113                                 inp->inp_vflag &= ~INP_IPV4;
1114                                 inp->inp_inc.inc_flags |= INC_ISIPV6;
1115                                 if ((error = prison_remote_ip6(td->td_ucred,
1116                                     &sin6->sin6_addr)))
1117                                         goto out;
1118                                 isipv6 = 1;
1119                         }
1120                         break;
1121                 }
1122 #endif /* INET6 */
1123                 default:
1124                         error = EAFNOSUPPORT;
1125                         goto out;
1126                 }
1127         }
1128         if (!(flags & PRUS_OOB)) {
1129                 sbappendstream(&so->so_snd, m, flags);
1130                 m = NULL;
1131                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1132                         KASSERT(tp->t_state == TCPS_CLOSED,
1133                             ("%s: tp %p is listening", __func__, tp));
1134
1135                         /*
1136                          * Do implied connect if not yet connected,
1137                          * initialize window to default value, and
1138                          * initialize maxseg using peer's cached MSS.
1139                          */
1140 #ifdef INET6
1141                         if (isipv6)
1142                                 error = tcp6_connect(tp, nam, td);
1143 #endif /* INET6 */
1144 #if defined(INET6) && defined(INET)
1145                         else
1146 #endif
1147 #ifdef INET
1148                                 error = tcp_connect(tp,
1149                                     (struct sockaddr *)sinp, td);
1150 #endif
1151                         /*
1152                          * The bind operation in tcp_connect succeeded. We
1153                          * no longer want to restore the flags if later
1154                          * operations fail.
1155                          */
1156                         if (error == 0 || inp->inp_lport != 0)
1157                                 restoreflags = false;
1158
1159                         if (error) {
1160                                 /* m is freed if PRUS_NOTREADY is unset. */
1161                                 sbflush(&so->so_snd);
1162                                 goto out;
1163                         }
1164                         if (IS_FASTOPEN(tp->t_flags))
1165                                 tcp_fastopen_connect(tp);
1166                         else {
1167                                 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1168                                 tcp_mss(tp, -1);
1169                         }
1170                 }
1171                 if (flags & PRUS_EOF) {
1172                         /*
1173                          * Close the send side of the connection after
1174                          * the data is sent.
1175                          */
1176                         socantsendmore(so);
1177                         tcp_usrclosed(tp);
1178                 }
1179                 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
1180                     ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
1181                     (tp->t_fbyte_out == 0) &&
1182                     (so->so_snd.sb_ccc > 0)) {
1183                         tp->t_fbyte_out = ticks;
1184                         if (tp->t_fbyte_out == 0)
1185                                 tp->t_fbyte_out = 1;
1186                         if (tp->t_fbyte_out && tp->t_fbyte_in)
1187                                 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
1188                 }
1189                 if (!(inp->inp_flags & INP_DROPPED) &&
1190                     !(flags & PRUS_NOTREADY)) {
1191                         if (flags & PRUS_MORETOCOME)
1192                                 tp->t_flags |= TF_MORETOCOME;
1193                         error = tcp_output_nodrop(tp);
1194                         if (flags & PRUS_MORETOCOME)
1195                                 tp->t_flags &= ~TF_MORETOCOME;
1196                 }
1197         } else {
1198                 /*
1199                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1200                  */
1201                 SOCKBUF_LOCK(&so->so_snd);
1202                 if (sbspace(&so->so_snd) < -512) {
1203                         SOCKBUF_UNLOCK(&so->so_snd);
1204                         error = ENOBUFS;
1205                         goto out;
1206                 }
1207                 /*
1208                  * According to RFC961 (Assigned Protocols),
1209                  * the urgent pointer points to the last octet
1210                  * of urgent data.  We continue, however,
1211                  * to consider it to indicate the first octet
1212                  * of data past the urgent section.
1213                  * Otherwise, snd_up should be one lower.
1214                  */
1215                 sbappendstream_locked(&so->so_snd, m, flags);
1216                 SOCKBUF_UNLOCK(&so->so_snd);
1217                 m = NULL;
1218                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1219                         /*
1220                          * Do implied connect if not yet connected,
1221                          * initialize window to default value, and
1222                          * initialize maxseg using peer's cached MSS.
1223                          */
1224
1225                         /*
1226                          * Not going to contemplate SYN|URG
1227                          */
1228                         if (IS_FASTOPEN(tp->t_flags))
1229                                 tp->t_flags &= ~TF_FASTOPEN;
1230 #ifdef INET6
1231                         if (isipv6)
1232                                 error = tcp6_connect(tp, nam, td);
1233 #endif /* INET6 */
1234 #if defined(INET6) && defined(INET)
1235                         else
1236 #endif
1237 #ifdef INET
1238                                 error = tcp_connect(tp,
1239                                     (struct sockaddr *)sinp, td);
1240 #endif
1241                         /*
1242                          * The bind operation in tcp_connect succeeded. We
1243                          * no longer want to restore the flags if later
1244                          * operations fail.
1245                          */
1246                         if (error == 0 || inp->inp_lport != 0)
1247                                 restoreflags = false;
1248
1249                         if (error != 0) {
1250                                 /* m is freed if PRUS_NOTREADY is unset. */
1251                                 sbflush(&so->so_snd);
1252                                 goto out;
1253                         }
1254                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
1255                         tcp_mss(tp, -1);
1256                 }
1257                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1258                 if ((flags & PRUS_NOTREADY) == 0) {
1259                         tp->t_flags |= TF_FORCEDATA;
1260                         error = tcp_output_nodrop(tp);
1261                         tp->t_flags &= ~TF_FORCEDATA;
1262                 }
1263         }
1264         TCP_LOG_EVENT(tp, NULL,
1265             &inp->inp_socket->so_rcv,
1266             &inp->inp_socket->so_snd,
1267             TCP_LOG_USERSEND, error,
1268             0, NULL, false);
1269
1270 out:
1271         /*
1272          * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
1273          * responsible for freeing memory.
1274          */
1275         if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1276                 m_freem(m);
1277
1278         /*
1279          * If the request was unsuccessful and we changed flags,
1280          * restore the original flags.
1281          */
1282         if (error != 0 && restoreflags) {
1283                 inp->inp_vflag = vflagsav;
1284                 inp->inp_inc.inc_flags = incflagsav;
1285         }
1286         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1287                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1288         TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1289                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1290         error = tcp_unlock_or_drop(tp, error);
1291         NET_EPOCH_EXIT(et);
1292         return (error);
1293 }
1294
1295 static int
1296 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1297 {
1298         struct epoch_tracker et;
1299         struct inpcb *inp;
1300         struct tcpcb *tp;
1301         int error;
1302
1303         inp = sotoinpcb(so);
1304         INP_WLOCK(inp);
1305         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1306                 INP_WUNLOCK(inp);
1307                 mb_free_notready(m, count);
1308                 return (ECONNRESET);
1309         }
1310         tp = intotcpcb(inp);
1311
1312         SOCKBUF_LOCK(&so->so_snd);
1313         error = sbready(&so->so_snd, m, count);
1314         SOCKBUF_UNLOCK(&so->so_snd);
1315         if (error) {
1316                 INP_WUNLOCK(inp);
1317                 return (error);
1318         }
1319         NET_EPOCH_ENTER(et);
1320         error = tcp_output_unlock(tp);
1321         NET_EPOCH_EXIT(et);
1322
1323         return (error);
1324 }
1325
1326 /*
1327  * Abort the TCP.  Drop the connection abruptly.
1328  */
1329 static void
1330 tcp_usr_abort(struct socket *so)
1331 {
1332         struct inpcb *inp;
1333         struct tcpcb *tp = NULL;
1334         struct epoch_tracker et;
1335         TCPDEBUG0;
1336
1337         inp = sotoinpcb(so);
1338         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1339
1340         NET_EPOCH_ENTER(et);
1341         INP_WLOCK(inp);
1342         KASSERT(inp->inp_socket != NULL,
1343             ("tcp_usr_abort: inp_socket == NULL"));
1344
1345         /*
1346          * If we still have full TCP state, and we're not dropped, drop.
1347          */
1348         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1349             !(inp->inp_flags & INP_DROPPED)) {
1350                 tp = intotcpcb(inp);
1351                 TCPDEBUG1();
1352                 tp = tcp_drop(tp, ECONNABORTED);
1353                 if (tp == NULL)
1354                         goto dropped;
1355                 TCPDEBUG2(PRU_ABORT);
1356                 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1357         }
1358         if (!(inp->inp_flags & INP_DROPPED)) {
1359                 SOCK_LOCK(so);
1360                 so->so_state |= SS_PROTOREF;
1361                 SOCK_UNLOCK(so);
1362                 inp->inp_flags |= INP_SOCKREF;
1363         }
1364         INP_WUNLOCK(inp);
1365 dropped:
1366         NET_EPOCH_EXIT(et);
1367 }
1368
1369 /*
1370  * TCP socket is closed.  Start friendly disconnect.
1371  */
1372 static void
1373 tcp_usr_close(struct socket *so)
1374 {
1375         struct inpcb *inp;
1376         struct tcpcb *tp = NULL;
1377         struct epoch_tracker et;
1378         TCPDEBUG0;
1379
1380         inp = sotoinpcb(so);
1381         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1382
1383         NET_EPOCH_ENTER(et);
1384         INP_WLOCK(inp);
1385         KASSERT(inp->inp_socket != NULL,
1386             ("tcp_usr_close: inp_socket == NULL"));
1387
1388         /*
1389          * If we still have full TCP state, and we're not dropped, initiate
1390          * a disconnect.
1391          */
1392         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1393             !(inp->inp_flags & INP_DROPPED)) {
1394                 tp = intotcpcb(inp);
1395                 TCPDEBUG1();
1396                 tcp_disconnect(tp);
1397                 TCPDEBUG2(PRU_CLOSE);
1398                 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1399         }
1400         if (!(inp->inp_flags & INP_DROPPED)) {
1401                 SOCK_LOCK(so);
1402                 so->so_state |= SS_PROTOREF;
1403                 SOCK_UNLOCK(so);
1404                 inp->inp_flags |= INP_SOCKREF;
1405         }
1406         INP_WUNLOCK(inp);
1407         NET_EPOCH_EXIT(et);
1408 }
1409
1410 static int
1411 tcp_pru_options_support(struct tcpcb *tp, int flags)
1412 {
1413         /*
1414          * If the specific TCP stack has a pru_options
1415          * specified then it does not always support
1416          * all the PRU_XX options and we must ask it.
1417          * If the function is not specified then all
1418          * of the PRU_XX options are supported.
1419          */
1420         int ret = 0;
1421
1422         if (tp->t_fb->tfb_pru_options) {
1423                 ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1424         }
1425         return (ret);
1426 }
1427
1428 /*
1429  * Receive out-of-band data.
1430  */
1431 static int
1432 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1433 {
1434         int error = 0;
1435         struct inpcb *inp;
1436         struct tcpcb *tp = NULL;
1437
1438         TCPDEBUG0;
1439         inp = sotoinpcb(so);
1440         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1441         INP_WLOCK(inp);
1442         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1443                 error = ECONNRESET;
1444                 goto out;
1445         }
1446         tp = intotcpcb(inp);
1447         error = tcp_pru_options_support(tp, PRUS_OOB);
1448         if (error) {
1449                 goto out;
1450         }
1451         TCPDEBUG1();
1452         if ((so->so_oobmark == 0 &&
1453              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1454             so->so_options & SO_OOBINLINE ||
1455             tp->t_oobflags & TCPOOB_HADDATA) {
1456                 error = EINVAL;
1457                 goto out;
1458         }
1459         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1460                 error = EWOULDBLOCK;
1461                 goto out;
1462         }
1463         m->m_len = 1;
1464         *mtod(m, caddr_t) = tp->t_iobc;
1465         if ((flags & MSG_PEEK) == 0)
1466                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1467
1468 out:
1469         TCPDEBUG2(PRU_RCVOOB);
1470         TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1471         INP_WUNLOCK(inp);
1472         return (error);
1473 }
1474
1475 #ifdef INET
1476 struct pr_usrreqs tcp_usrreqs = {
1477         .pru_abort =            tcp_usr_abort,
1478         .pru_accept =           tcp_usr_accept,
1479         .pru_attach =           tcp_usr_attach,
1480         .pru_bind =             tcp_usr_bind,
1481         .pru_connect =          tcp_usr_connect,
1482         .pru_control =          in_control,
1483         .pru_detach =           tcp_usr_detach,
1484         .pru_disconnect =       tcp_usr_disconnect,
1485         .pru_listen =           tcp_usr_listen,
1486         .pru_peeraddr =         in_getpeeraddr,
1487         .pru_rcvd =             tcp_usr_rcvd,
1488         .pru_rcvoob =           tcp_usr_rcvoob,
1489         .pru_send =             tcp_usr_send,
1490         .pru_ready =            tcp_usr_ready,
1491         .pru_shutdown =         tcp_usr_shutdown,
1492         .pru_sockaddr =         in_getsockaddr,
1493         .pru_sosetlabel =       in_pcbsosetlabel,
1494         .pru_close =            tcp_usr_close,
1495 };
1496 #endif /* INET */
1497
1498 #ifdef INET6
1499 struct pr_usrreqs tcp6_usrreqs = {
1500         .pru_abort =            tcp_usr_abort,
1501         .pru_accept =           tcp6_usr_accept,
1502         .pru_attach =           tcp_usr_attach,
1503         .pru_bind =             tcp6_usr_bind,
1504         .pru_connect =          tcp6_usr_connect,
1505         .pru_control =          in6_control,
1506         .pru_detach =           tcp_usr_detach,
1507         .pru_disconnect =       tcp_usr_disconnect,
1508         .pru_listen =           tcp6_usr_listen,
1509         .pru_peeraddr =         in6_mapped_peeraddr,
1510         .pru_rcvd =             tcp_usr_rcvd,
1511         .pru_rcvoob =           tcp_usr_rcvoob,
1512         .pru_send =             tcp_usr_send,
1513         .pru_ready =            tcp_usr_ready,
1514         .pru_shutdown =         tcp_usr_shutdown,
1515         .pru_sockaddr =         in6_mapped_sockaddr,
1516         .pru_sosetlabel =       in_pcbsosetlabel,
1517         .pru_close =            tcp_usr_close,
1518 };
1519 #endif /* INET6 */
1520
1521 #ifdef INET
1522 /*
1523  * Common subroutine to open a TCP connection to remote host specified
1524  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1525  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1526  * to choose a local host address (interface).  If there is an existing
1527  * incarnation of the same connection in TIME-WAIT state and if the remote
1528  * host was sending CC options and if the connection duration was < MSL, then
1529  * truncate the previous TIME-WAIT state and proceed.
1530  * Initialize connection parameters and enter SYN-SENT state.
1531  */
1532 static int
1533 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1534 {
1535         struct inpcb *inp = tp->t_inpcb, *oinp;
1536         struct socket *so = inp->inp_socket;
1537         struct in_addr laddr;
1538         u_short lport;
1539         int error;
1540
1541         NET_EPOCH_ASSERT();
1542         INP_WLOCK_ASSERT(inp);
1543         INP_HASH_WLOCK(&V_tcbinfo);
1544
1545         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1546                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1547                 if (error)
1548                         goto out;
1549         }
1550
1551         /*
1552          * Cannot simply call in_pcbconnect, because there might be an
1553          * earlier incarnation of this same connection still in
1554          * TIME_WAIT state, creating an ADDRINUSE error.
1555          */
1556         laddr = inp->inp_laddr;
1557         lport = inp->inp_lport;
1558         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1559             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1560         if (error && oinp == NULL)
1561                 goto out;
1562         if (oinp) {
1563                 error = EADDRINUSE;
1564                 goto out;
1565         }
1566         /* Handle initial bind if it hadn't been done in advance. */
1567         if (inp->inp_lport == 0) {
1568                 inp->inp_lport = lport;
1569                 if (in_pcbinshash(inp) != 0) {
1570                         inp->inp_lport = 0;
1571                         error = EAGAIN;
1572                         goto out;
1573                 }
1574         }
1575         inp->inp_laddr = laddr;
1576         in_pcbrehash(inp);
1577         INP_HASH_WUNLOCK(&V_tcbinfo);
1578
1579         /*
1580          * Compute window scaling to request:
1581          * Scale to fit into sweet spot.  See tcp_syncache.c.
1582          * XXX: This should move to tcp_output().
1583          */
1584         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1585             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1586                 tp->request_r_scale++;
1587
1588         soisconnecting(so);
1589         TCPSTAT_INC(tcps_connattempt);
1590         tcp_state_change(tp, TCPS_SYN_SENT);
1591         tp->iss = tcp_new_isn(&inp->inp_inc);
1592         if (tp->t_flags & TF_REQ_TSTMP)
1593                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1594         tcp_sendseqinit(tp);
1595
1596         return 0;
1597
1598 out:
1599         INP_HASH_WUNLOCK(&V_tcbinfo);
1600         return (error);
1601 }
1602 #endif /* INET */
1603
1604 #ifdef INET6
1605 static int
1606 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1607 {
1608         struct inpcb *inp = tp->t_inpcb;
1609         int error;
1610
1611         INP_WLOCK_ASSERT(inp);
1612         INP_HASH_WLOCK(&V_tcbinfo);
1613
1614         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1615                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1616                 if (error)
1617                         goto out;
1618         }
1619         error = in6_pcbconnect(inp, nam, td->td_ucred);
1620         if (error != 0)
1621                 goto out;
1622         INP_HASH_WUNLOCK(&V_tcbinfo);
1623
1624         /* Compute window scaling to request.  */
1625         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1626             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1627                 tp->request_r_scale++;
1628
1629         soisconnecting(inp->inp_socket);
1630         TCPSTAT_INC(tcps_connattempt);
1631         tcp_state_change(tp, TCPS_SYN_SENT);
1632         tp->iss = tcp_new_isn(&inp->inp_inc);
1633         if (tp->t_flags & TF_REQ_TSTMP)
1634                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1635         tcp_sendseqinit(tp);
1636
1637         return 0;
1638
1639 out:
1640         INP_HASH_WUNLOCK(&V_tcbinfo);
1641         return error;
1642 }
1643 #endif /* INET6 */
1644
1645 /*
1646  * Export TCP internal state information via a struct tcp_info, based on the
1647  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1648  * (TCP state machine, etc).  We export all information using FreeBSD-native
1649  * constants -- for example, the numeric values for tcpi_state will differ
1650  * from Linux.
1651  */
1652 static void
1653 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1654 {
1655
1656         INP_WLOCK_ASSERT(tp->t_inpcb);
1657         bzero(ti, sizeof(*ti));
1658
1659         ti->tcpi_state = tp->t_state;
1660         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1661                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1662         if (tp->t_flags & TF_SACK_PERMIT)
1663                 ti->tcpi_options |= TCPI_OPT_SACK;
1664         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1665                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1666                 ti->tcpi_snd_wscale = tp->snd_scale;
1667                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1668         }
1669         if (tp->t_flags2 & TF2_ECN_PERMIT)
1670                 ti->tcpi_options |= TCPI_OPT_ECN;
1671
1672         ti->tcpi_rto = tp->t_rxtcur * tick;
1673         ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1674         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1675         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1676
1677         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1678         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1679
1680         /*
1681          * FreeBSD-specific extension fields for tcp_info.
1682          */
1683         ti->tcpi_rcv_space = tp->rcv_wnd;
1684         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1685         ti->tcpi_snd_wnd = tp->snd_wnd;
1686         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1687         ti->tcpi_snd_nxt = tp->snd_nxt;
1688         ti->tcpi_snd_mss = tp->t_maxseg;
1689         ti->tcpi_rcv_mss = tp->t_maxseg;
1690         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1691         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1692         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1693 #ifdef TCP_OFFLOAD
1694         if (tp->t_flags & TF_TOE) {
1695                 ti->tcpi_options |= TCPI_OPT_TOE;
1696                 tcp_offload_tcp_info(tp, ti);
1697         }
1698 #endif
1699 }
1700
1701 /*
1702  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1703  * socket option arguments.  When it re-acquires the lock after the copy, it
1704  * has to revalidate that the connection is still valid for the socket
1705  * option.
1706  */
1707 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do {                    \
1708         INP_WLOCK(inp);                                                 \
1709         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1710                 INP_WUNLOCK(inp);                                       \
1711                 cleanup;                                                \
1712                 return (ECONNRESET);                                    \
1713         }                                                               \
1714         tp = intotcpcb(inp);                                            \
1715 } while(0)
1716 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1717
1718 static int
1719 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt)
1720 {
1721         struct  tcpcb *tp = intotcpcb(inp);
1722         int error = 0;
1723
1724         MPASS(sopt->sopt_dir == SOPT_SET);
1725
1726         if (sopt->sopt_level != IPPROTO_TCP) {
1727 #ifdef INET6
1728                 if (inp->inp_vflag & INP_IPV6PROTO)
1729                         error = ip6_ctloutput(inp->inp_socket, sopt);
1730 #endif
1731 #if defined(INET6) && defined(INET)
1732                 else
1733 #endif
1734 #ifdef INET
1735                         error = ip_ctloutput(inp->inp_socket, sopt);
1736 #endif
1737                 /*
1738                  * When an IP-level socket option affects TCP, pass control
1739                  * down to stack tfb_tcp_ctloutput, otherwise return what
1740                  * IP level returned.
1741                  */
1742                 switch (sopt->sopt_level) {
1743 #ifdef INET6
1744                 case IPPROTO_IPV6:
1745                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
1746                                 return (error);
1747                         switch (sopt->sopt_name) {
1748                         case IPV6_TCLASS:
1749                                 /* Notify tcp stacks that care (e.g. RACK). */
1750                                 break;
1751                         case IPV6_USE_MIN_MTU:
1752                                 /* Update t_maxseg accordingly. */
1753                                 break;
1754                         default:
1755                                 return (error);
1756                         }
1757                         break;
1758 #endif
1759 #ifdef INET
1760                 case IPPROTO_IP:
1761                         switch (sopt->sopt_name) {
1762                         case IP_TOS:
1763                         case IP_TTL:
1764                                 /* Notify tcp stacks that care (e.g. RACK). */
1765                                 break;
1766                         default:
1767                                 return (error);
1768                         }
1769                         break;
1770 #endif
1771                 default:
1772                         return (error);
1773                 }
1774         } else if (sopt->sopt_name == TCP_FUNCTION_BLK) {
1775                 /*
1776                  * Protect the TCP option TCP_FUNCTION_BLK so
1777                  * that a sub-function can *never* overwrite this.
1778                  */
1779                 struct tcp_function_set fsn;
1780                 struct tcp_function_block *blk;
1781
1782                 error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn);
1783                 if (error)
1784                         return (error);
1785
1786                 INP_WLOCK(inp);
1787                 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1788                         INP_WUNLOCK(inp);
1789                         return (ECONNRESET);
1790                 }
1791                 tp = intotcpcb(inp);
1792
1793                 blk = find_and_ref_tcp_functions(&fsn);
1794                 if (blk == NULL) {
1795                         INP_WUNLOCK(inp);
1796                         return (ENOENT);
1797                 }
1798                 if (tp->t_fb == blk) {
1799                         /* You already have this */
1800                         refcount_release(&blk->tfb_refcnt);
1801                         INP_WUNLOCK(inp);
1802                         return (0);
1803                 }
1804                 if (tp->t_state != TCPS_CLOSED) {
1805                         /*
1806                          * The user has advanced the state
1807                          * past the initial point, we may not
1808                          * be able to switch.
1809                          */
1810                         if (blk->tfb_tcp_handoff_ok != NULL) {
1811                                 /*
1812                                  * Does the stack provide a
1813                                  * query mechanism, if so it may
1814                                  * still be possible?
1815                                  */
1816                                 error = (*blk->tfb_tcp_handoff_ok)(tp);
1817                         } else
1818                                 error = EINVAL;
1819                         if (error) {
1820                                 refcount_release(&blk->tfb_refcnt);
1821                                 INP_WUNLOCK(inp);
1822                                 return(error);
1823                         }
1824                 }
1825                 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1826                         refcount_release(&blk->tfb_refcnt);
1827                         INP_WUNLOCK(inp);
1828                         return (ENOENT);
1829                 }
1830                 /*
1831                  * Release the old refcnt, the
1832                  * lookup acquired a ref on the
1833                  * new one already.
1834                  */
1835                 if (tp->t_fb->tfb_tcp_fb_fini) {
1836                         struct epoch_tracker et;
1837                         /*
1838                          * Tell the stack to cleanup with 0 i.e.
1839                          * the tcb is not going away.
1840                          */
1841                         NET_EPOCH_ENTER(et);
1842                         (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1843                         NET_EPOCH_EXIT(et);
1844                 }
1845 #ifdef TCPHPTS
1846                 /* Assure that we are not on any hpts */
1847                 tcp_hpts_remove(tp->t_inpcb);
1848 #endif
1849                 if (blk->tfb_tcp_fb_init) {
1850                         error = (*blk->tfb_tcp_fb_init)(tp);
1851                         if (error) {
1852                                 refcount_release(&blk->tfb_refcnt);
1853                                 if (tp->t_fb->tfb_tcp_fb_init) {
1854                                         if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0)  {
1855                                                 /* Fall back failed, drop the connection */
1856                                                 INP_WUNLOCK(inp);
1857                                                 soabort(inp->inp_socket);
1858                                                 return(error);
1859                                         }
1860                                 }
1861                                 goto err_out;
1862                         }
1863                 }
1864                 refcount_release(&tp->t_fb->tfb_refcnt);
1865                 tp->t_fb = blk;
1866 #ifdef TCP_OFFLOAD
1867                 if (tp->t_flags & TF_TOE) {
1868                         tcp_offload_ctloutput(tp, sopt->sopt_dir,
1869                              sopt->sopt_name);
1870                 }
1871 #endif
1872 err_out:
1873                 INP_WUNLOCK(inp);
1874                 return (error);
1875         }
1876
1877         INP_WLOCK(inp);
1878         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1879                 INP_WUNLOCK(inp);
1880                 return (ECONNRESET);
1881         }
1882         tp = intotcpcb(inp);
1883
1884         /* Pass in the INP locked, caller must unlock it. */
1885         return (tp->t_fb->tfb_tcp_ctloutput(inp->inp_socket, sopt, inp, tp));
1886 }
1887
1888 static int
1889 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt)
1890 {
1891         int     error = 0;
1892         struct  tcpcb *tp;
1893
1894         MPASS(sopt->sopt_dir == SOPT_GET);
1895
1896         if (sopt->sopt_level != IPPROTO_TCP) {
1897 #ifdef INET6
1898                 if (inp->inp_vflag & INP_IPV6PROTO)
1899                         error = ip6_ctloutput(inp->inp_socket, sopt);
1900 #endif /* INET6 */
1901 #if defined(INET6) && defined(INET)
1902                 else
1903 #endif
1904 #ifdef INET
1905                         error = ip_ctloutput(inp->inp_socket, sopt);
1906 #endif
1907                 return (error);
1908         }
1909         INP_WLOCK(inp);
1910         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1911                 INP_WUNLOCK(inp);
1912                 return (ECONNRESET);
1913         }
1914         tp = intotcpcb(inp);
1915         if (((sopt->sopt_name == TCP_FUNCTION_BLK) ||
1916              (sopt->sopt_name == TCP_FUNCTION_ALIAS))) {
1917                 struct tcp_function_set fsn;
1918
1919                 if (sopt->sopt_name == TCP_FUNCTION_ALIAS) {
1920                         memset(&fsn, 0, sizeof(fsn));
1921                         find_tcp_function_alias(tp->t_fb, &fsn);
1922                 } else {
1923                         strncpy(fsn.function_set_name,
1924                             tp->t_fb->tfb_tcp_block_name,
1925                             TCP_FUNCTION_NAME_LEN_MAX);
1926                         fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1927                 }
1928                 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1929                 INP_WUNLOCK(inp);
1930                 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1931                 return (error);
1932         }
1933
1934         /* Pass in the INP locked, caller must unlock it. */
1935         return (tp->t_fb->tfb_tcp_ctloutput(inp->inp_socket, sopt, inp, tp));
1936 }
1937
1938 int
1939 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1940 {
1941         int     error;
1942         struct  inpcb *inp;
1943
1944         error = 0;
1945         inp = sotoinpcb(so);
1946         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1947
1948         if (sopt->sopt_dir == SOPT_SET)
1949                 return (tcp_ctloutput_set(inp, sopt));
1950         else if (sopt->sopt_dir == SOPT_GET)
1951                 return (tcp_ctloutput_get(inp, sopt));
1952         else
1953                 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
1954 }
1955
1956 /*
1957  * If this assert becomes untrue, we need to change the size of the buf
1958  * variable in tcp_default_ctloutput().
1959  */
1960 #ifdef CTASSERT
1961 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1962 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1963 #endif
1964
1965 #ifdef KERN_TLS
1966 static int
1967 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
1968 {
1969         struct tls_enable_v0 tls_v0;
1970         int error;
1971
1972         if (sopt->sopt_valsize == sizeof(tls_v0)) {
1973                 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
1974                     sizeof(tls_v0));
1975                 if (error)
1976                         return (error);
1977                 memset(tls, 0, sizeof(*tls));
1978                 tls->cipher_key = tls_v0.cipher_key;
1979                 tls->iv = tls_v0.iv;
1980                 tls->auth_key = tls_v0.auth_key;
1981                 tls->cipher_algorithm = tls_v0.cipher_algorithm;
1982                 tls->cipher_key_len = tls_v0.cipher_key_len;
1983                 tls->iv_len = tls_v0.iv_len;
1984                 tls->auth_algorithm = tls_v0.auth_algorithm;
1985                 tls->auth_key_len = tls_v0.auth_key_len;
1986                 tls->flags = tls_v0.flags;
1987                 tls->tls_vmajor = tls_v0.tls_vmajor;
1988                 tls->tls_vminor = tls_v0.tls_vminor;
1989                 return (0);
1990         }
1991
1992         return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
1993 }
1994 #endif
1995
1996 extern struct cc_algo newreno_cc_algo;
1997
1998 static int
1999 tcp_congestion(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
2000 {
2001         struct cc_algo *algo;
2002         void *ptr = NULL;
2003         struct cc_var cc_mem;
2004         char    buf[TCP_CA_NAME_MAX];
2005         size_t mem_sz;
2006         int error;
2007
2008         INP_WUNLOCK(inp);
2009         error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
2010         if (error)
2011                 return(error);
2012         buf[sopt->sopt_valsize] = '\0';
2013         CC_LIST_RLOCK();
2014         STAILQ_FOREACH(algo, &cc_list, entries)
2015                 if (strncmp(buf, algo->name,
2016                             TCP_CA_NAME_MAX) == 0) {
2017                         if (algo->flags & CC_MODULE_BEING_REMOVED) {
2018                                 /* We can't "see" modules being unloaded */
2019                                 continue;
2020                         }
2021                         break;
2022                 }
2023         if (algo == NULL) {
2024                 CC_LIST_RUNLOCK();
2025                 return(ESRCH);
2026         }
2027 do_over:
2028         if (algo->cb_init != NULL) {
2029                 /* We can now pre-get the memory for the CC */
2030                 mem_sz = (*algo->cc_data_sz)();
2031                 if (mem_sz == 0) {
2032                         goto no_mem_needed;
2033                 }
2034                 CC_LIST_RUNLOCK();
2035                 ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK);
2036                 CC_LIST_RLOCK();
2037                 STAILQ_FOREACH(algo, &cc_list, entries)
2038                         if (strncmp(buf, algo->name,
2039                                     TCP_CA_NAME_MAX) == 0)
2040                                 break;
2041                 if (algo == NULL) {
2042                         if (ptr)
2043                                 free(ptr, M_CC_MEM);
2044                         CC_LIST_RUNLOCK();
2045                         return(ESRCH);
2046                 }
2047         } else {
2048 no_mem_needed:
2049                 mem_sz = 0;
2050                 ptr = NULL;
2051         }
2052         /*
2053          * Make sure its all clean and zero and also get
2054          * back the inplock.
2055          */
2056         memset(&cc_mem, 0, sizeof(cc_mem));
2057         if (mem_sz != (*algo->cc_data_sz)()) {
2058                 if (ptr)
2059                         free(ptr, M_CC_MEM);
2060                 goto do_over;
2061         }
2062         INP_WLOCK(inp);
2063         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
2064                 INP_WUNLOCK(inp);
2065                 CC_LIST_RUNLOCK();
2066                 free(ptr, M_CC_MEM);
2067                 return (ECONNRESET);
2068         }
2069         tp = intotcpcb(inp);
2070         if (ptr != NULL)
2071                 memset(ptr, 0, mem_sz);
2072         CC_LIST_RUNLOCK();
2073         cc_mem.ccvc.tcp = tp;
2074         /*
2075          * We once again hold a write lock over the tcb so it's
2076          * safe to do these things without ordering concerns.
2077          * Note here we init into stack memory.
2078          */
2079         if (algo->cb_init != NULL)
2080                 error = algo->cb_init(&cc_mem, ptr);
2081         else
2082                 error = 0;
2083         /*
2084          * The CC algorithms, when given their memory
2085          * should not fail we could in theory have a
2086          * KASSERT here.
2087          */
2088         if (error == 0) {
2089                 /*
2090                  * Touchdown, lets go ahead and move the
2091                  * connection to the new CC module by
2092                  * copying in the cc_mem after we call
2093                  * the old ones cleanup (if any).
2094                  */
2095                 if (CC_ALGO(tp)->cb_destroy != NULL)
2096                         CC_ALGO(tp)->cb_destroy(tp->ccv);
2097                 memcpy(tp->ccv, &cc_mem, sizeof(struct cc_var));
2098                 tp->cc_algo = algo;
2099                 /* Ok now are we where we have gotten past any conn_init? */
2100                 if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) {
2101                         /* Yep run the connection init for the new CC */
2102                         CC_ALGO(tp)->conn_init(tp->ccv);
2103                 }
2104         } else if (ptr)
2105                 free(ptr, M_CC_MEM);
2106         INP_WUNLOCK(inp);
2107         return (error);
2108 }
2109
2110 int
2111 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
2112 {
2113         int     error, opt, optval;
2114         u_int   ui;
2115         struct  tcp_info ti;
2116 #ifdef KERN_TLS
2117         struct tls_enable tls;
2118 #endif
2119         char    *pbuf, buf[TCP_LOG_ID_LEN];
2120 #ifdef STATS
2121         struct statsblob *sbp;
2122 #endif
2123         size_t  len;
2124
2125         INP_WLOCK_ASSERT(inp);
2126
2127         switch (sopt->sopt_level) {
2128 #ifdef INET6
2129         case IPPROTO_IPV6:
2130                 MPASS(inp->inp_vflag & INP_IPV6PROTO);
2131                 switch (sopt->sopt_name) {
2132                 case IPV6_USE_MIN_MTU:
2133                         tcp6_use_min_mtu(tp);
2134                         /* FALLTHROUGH */
2135                 }
2136                 INP_WUNLOCK(inp);
2137                 return (0);
2138 #endif
2139 #ifdef INET
2140         case IPPROTO_IP:
2141                 INP_WUNLOCK(inp);
2142                 return (0);
2143 #endif
2144         }
2145
2146         /*
2147          * For TCP_CCALGOOPT forward the control to CC module, for both
2148          * SOPT_SET and SOPT_GET.
2149          */
2150         switch (sopt->sopt_name) {
2151         case TCP_CCALGOOPT:
2152                 INP_WUNLOCK(inp);
2153                 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
2154                         return (EINVAL);
2155                 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
2156                 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
2157                     sopt->sopt_valsize);
2158                 if (error) {
2159                         free(pbuf, M_TEMP);
2160                         return (error);
2161                 }
2162                 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
2163                 if (CC_ALGO(tp)->ctl_output != NULL)
2164                         error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
2165                 else
2166                         error = ENOENT;
2167                 INP_WUNLOCK(inp);
2168                 if (error == 0 && sopt->sopt_dir == SOPT_GET)
2169                         error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
2170                 free(pbuf, M_TEMP);
2171                 return (error);
2172         }
2173
2174         switch (sopt->sopt_dir) {
2175         case SOPT_SET:
2176                 switch (sopt->sopt_name) {
2177 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2178                 case TCP_MD5SIG:
2179                         if (!TCPMD5_ENABLED()) {
2180                                 INP_WUNLOCK(inp);
2181                                 return (ENOPROTOOPT);
2182                         }
2183                         error = TCPMD5_PCBCTL(inp, sopt);
2184                         if (error)
2185                                 return (error);
2186                         goto unlock_and_done;
2187 #endif /* IPSEC */
2188
2189                 case TCP_NODELAY:
2190                 case TCP_NOOPT:
2191                 case TCP_LRD:
2192                         INP_WUNLOCK(inp);
2193                         error = sooptcopyin(sopt, &optval, sizeof optval,
2194                             sizeof optval);
2195                         if (error)
2196                                 return (error);
2197
2198                         INP_WLOCK_RECHECK(inp);
2199                         switch (sopt->sopt_name) {
2200                         case TCP_NODELAY:
2201                                 opt = TF_NODELAY;
2202                                 break;
2203                         case TCP_NOOPT:
2204                                 opt = TF_NOOPT;
2205                                 break;
2206                         case TCP_LRD:
2207                                 opt = TF_LRD;
2208                                 break;
2209                         default:
2210                                 opt = 0; /* dead code to fool gcc */
2211                                 break;
2212                         }
2213
2214                         if (optval)
2215                                 tp->t_flags |= opt;
2216                         else
2217                                 tp->t_flags &= ~opt;
2218 unlock_and_done:
2219 #ifdef TCP_OFFLOAD
2220                         if (tp->t_flags & TF_TOE) {
2221                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
2222                                     sopt->sopt_name);
2223                         }
2224 #endif
2225                         INP_WUNLOCK(inp);
2226                         break;
2227
2228                 case TCP_NOPUSH:
2229                         INP_WUNLOCK(inp);
2230                         error = sooptcopyin(sopt, &optval, sizeof optval,
2231                             sizeof optval);
2232                         if (error)
2233                                 return (error);
2234
2235                         INP_WLOCK_RECHECK(inp);
2236                         if (optval)
2237                                 tp->t_flags |= TF_NOPUSH;
2238                         else if (tp->t_flags & TF_NOPUSH) {
2239                                 tp->t_flags &= ~TF_NOPUSH;
2240                                 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2241                                         struct epoch_tracker et;
2242
2243                                         NET_EPOCH_ENTER(et);
2244                                         error = tcp_output_nodrop(tp);
2245                                         NET_EPOCH_EXIT(et);
2246                                 }
2247                         }
2248                         goto unlock_and_done;
2249
2250                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2251                         INP_WUNLOCK(inp);
2252                         error = sooptcopyin(sopt, &optval, sizeof optval,
2253                             sizeof optval);
2254                         if (error)
2255                                 return (error);
2256                         if ((optval < TCP_TUNNELING_PORT_MIN) ||
2257                             (optval > TCP_TUNNELING_PORT_MAX)) {
2258                                 /* Its got to be in range */
2259                                 return (EINVAL);
2260                         }
2261                         if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
2262                                 /* You have to have enabled a UDP tunneling port first */
2263                                 return (EINVAL);
2264                         }
2265                         INP_WLOCK_RECHECK(inp);
2266                         if (tp->t_state != TCPS_CLOSED) {
2267                                 /* You can't change after you are connected */
2268                                 error = EINVAL;
2269                         } else {
2270                                 /* Ok we are all good set the port */
2271                                 tp->t_port = htons(optval);
2272                         }
2273                         goto unlock_and_done;
2274
2275                 case TCP_MAXSEG:
2276                         INP_WUNLOCK(inp);
2277                         error = sooptcopyin(sopt, &optval, sizeof optval,
2278                             sizeof optval);
2279                         if (error)
2280                                 return (error);
2281
2282                         INP_WLOCK_RECHECK(inp);
2283                         if (optval > 0 && optval <= tp->t_maxseg &&
2284                             optval + 40 >= V_tcp_minmss)
2285                                 tp->t_maxseg = optval;
2286                         else
2287                                 error = EINVAL;
2288                         goto unlock_and_done;
2289
2290                 case TCP_INFO:
2291                         INP_WUNLOCK(inp);
2292                         error = EINVAL;
2293                         break;
2294
2295                 case TCP_STATS:
2296                         INP_WUNLOCK(inp);
2297 #ifdef STATS
2298                         error = sooptcopyin(sopt, &optval, sizeof optval,
2299                             sizeof optval);
2300                         if (error)
2301                                 return (error);
2302
2303                         if (optval > 0)
2304                                 sbp = stats_blob_alloc(
2305                                     V_tcp_perconn_stats_dflt_tpl, 0);
2306                         else
2307                                 sbp = NULL;
2308
2309                         INP_WLOCK_RECHECK(inp);
2310                         if ((tp->t_stats != NULL && sbp == NULL) ||
2311                             (tp->t_stats == NULL && sbp != NULL)) {
2312                                 struct statsblob *t = tp->t_stats;
2313                                 tp->t_stats = sbp;
2314                                 sbp = t;
2315                         }
2316                         INP_WUNLOCK(inp);
2317
2318                         stats_blob_destroy(sbp);
2319 #else
2320                         return (EOPNOTSUPP);
2321 #endif /* !STATS */
2322                         break;
2323
2324                 case TCP_CONGESTION:
2325                         error = tcp_congestion(so, sopt, inp, tp);
2326                         break;
2327
2328                 case TCP_REUSPORT_LB_NUMA:
2329                         INP_WUNLOCK(inp);
2330                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2331                             sizeof(optval));
2332                         INP_WLOCK_RECHECK(inp);
2333                         if (!error)
2334                                 error = in_pcblbgroup_numa(inp, optval);
2335                         INP_WUNLOCK(inp);
2336                         break;
2337
2338 #ifdef KERN_TLS
2339                 case TCP_TXTLS_ENABLE:
2340                         INP_WUNLOCK(inp);
2341                         error = copyin_tls_enable(sopt, &tls);
2342                         if (error)
2343                                 break;
2344                         error = ktls_enable_tx(so, &tls);
2345                         break;
2346                 case TCP_TXTLS_MODE:
2347                         INP_WUNLOCK(inp);
2348                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2349                         if (error)
2350                                 return (error);
2351
2352                         INP_WLOCK_RECHECK(inp);
2353                         error = ktls_set_tx_mode(so, ui);
2354                         INP_WUNLOCK(inp);
2355                         break;
2356                 case TCP_RXTLS_ENABLE:
2357                         INP_WUNLOCK(inp);
2358                         error = sooptcopyin(sopt, &tls, sizeof(tls),
2359                             sizeof(tls));
2360                         if (error)
2361                                 break;
2362                         error = ktls_enable_rx(so, &tls);
2363                         break;
2364 #endif
2365
2366                 case TCP_KEEPIDLE:
2367                 case TCP_KEEPINTVL:
2368                 case TCP_KEEPINIT:
2369                         INP_WUNLOCK(inp);
2370                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2371                         if (error)
2372                                 return (error);
2373
2374                         if (ui > (UINT_MAX / hz)) {
2375                                 error = EINVAL;
2376                                 break;
2377                         }
2378                         ui *= hz;
2379
2380                         INP_WLOCK_RECHECK(inp);
2381                         switch (sopt->sopt_name) {
2382                         case TCP_KEEPIDLE:
2383                                 tp->t_keepidle = ui;
2384                                 /*
2385                                  * XXX: better check current remaining
2386                                  * timeout and "merge" it with new value.
2387                                  */
2388                                 if ((tp->t_state > TCPS_LISTEN) &&
2389                                     (tp->t_state <= TCPS_CLOSING))
2390                                         tcp_timer_activate(tp, TT_KEEP,
2391                                             TP_KEEPIDLE(tp));
2392                                 break;
2393                         case TCP_KEEPINTVL:
2394                                 tp->t_keepintvl = ui;
2395                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2396                                     (TP_MAXIDLE(tp) > 0))
2397                                         tcp_timer_activate(tp, TT_2MSL,
2398                                             TP_MAXIDLE(tp));
2399                                 break;
2400                         case TCP_KEEPINIT:
2401                                 tp->t_keepinit = ui;
2402                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
2403                                     tp->t_state == TCPS_SYN_SENT)
2404                                         tcp_timer_activate(tp, TT_KEEP,
2405                                             TP_KEEPINIT(tp));
2406                                 break;
2407                         }
2408                         goto unlock_and_done;
2409
2410                 case TCP_KEEPCNT:
2411                         INP_WUNLOCK(inp);
2412                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2413                         if (error)
2414                                 return (error);
2415
2416                         INP_WLOCK_RECHECK(inp);
2417                         tp->t_keepcnt = ui;
2418                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2419                             (TP_MAXIDLE(tp) > 0))
2420                                 tcp_timer_activate(tp, TT_2MSL,
2421                                     TP_MAXIDLE(tp));
2422                         goto unlock_and_done;
2423
2424 #ifdef TCPPCAP
2425                 case TCP_PCAP_OUT:
2426                 case TCP_PCAP_IN:
2427                         INP_WUNLOCK(inp);
2428                         error = sooptcopyin(sopt, &optval, sizeof optval,
2429                             sizeof optval);
2430                         if (error)
2431                                 return (error);
2432
2433                         INP_WLOCK_RECHECK(inp);
2434                         if (optval >= 0)
2435                                 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2436                                         &(tp->t_outpkts) : &(tp->t_inpkts),
2437                                         optval);
2438                         else
2439                                 error = EINVAL;
2440                         goto unlock_and_done;
2441 #endif
2442
2443                 case TCP_FASTOPEN: {
2444                         struct tcp_fastopen tfo_optval;
2445
2446                         INP_WUNLOCK(inp);
2447                         if (!V_tcp_fastopen_client_enable &&
2448                             !V_tcp_fastopen_server_enable)
2449                                 return (EPERM);
2450
2451                         error = sooptcopyin(sopt, &tfo_optval,
2452                                     sizeof(tfo_optval), sizeof(int));
2453                         if (error)
2454                                 return (error);
2455
2456                         INP_WLOCK_RECHECK(inp);
2457                         if ((tp->t_state != TCPS_CLOSED) &&
2458                             (tp->t_state != TCPS_LISTEN)) {
2459                                 error = EINVAL;
2460                                 goto unlock_and_done;
2461                         }
2462                         if (tfo_optval.enable) {
2463                                 if (tp->t_state == TCPS_LISTEN) {
2464                                         if (!V_tcp_fastopen_server_enable) {
2465                                                 error = EPERM;
2466                                                 goto unlock_and_done;
2467                                         }
2468
2469                                         if (tp->t_tfo_pending == NULL)
2470                                                 tp->t_tfo_pending =
2471                                                     tcp_fastopen_alloc_counter();
2472                                 } else {
2473                                         /*
2474                                          * If a pre-shared key was provided,
2475                                          * stash it in the client cookie
2476                                          * field of the tcpcb for use during
2477                                          * connect.
2478                                          */
2479                                         if (sopt->sopt_valsize ==
2480                                             sizeof(tfo_optval)) {
2481                                                 memcpy(tp->t_tfo_cookie.client,
2482                                                        tfo_optval.psk,
2483                                                        TCP_FASTOPEN_PSK_LEN);
2484                                                 tp->t_tfo_client_cookie_len =
2485                                                     TCP_FASTOPEN_PSK_LEN;
2486                                         }
2487                                 }
2488                                 tp->t_flags |= TF_FASTOPEN;
2489                         } else
2490                                 tp->t_flags &= ~TF_FASTOPEN;
2491                         goto unlock_and_done;
2492                 }
2493
2494 #ifdef TCP_BLACKBOX
2495                 case TCP_LOG:
2496                         INP_WUNLOCK(inp);
2497                         error = sooptcopyin(sopt, &optval, sizeof optval,
2498                             sizeof optval);
2499                         if (error)
2500                                 return (error);
2501
2502                         INP_WLOCK_RECHECK(inp);
2503                         error = tcp_log_state_change(tp, optval);
2504                         goto unlock_and_done;
2505
2506                 case TCP_LOGBUF:
2507                         INP_WUNLOCK(inp);
2508                         error = EINVAL;
2509                         break;
2510
2511                 case TCP_LOGID:
2512                         INP_WUNLOCK(inp);
2513                         error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2514                         if (error)
2515                                 break;
2516                         buf[sopt->sopt_valsize] = '\0';
2517                         INP_WLOCK_RECHECK(inp);
2518                         error = tcp_log_set_id(tp, buf);
2519                         /* tcp_log_set_id() unlocks the INP. */
2520                         break;
2521
2522                 case TCP_LOGDUMP:
2523                 case TCP_LOGDUMPID:
2524                         INP_WUNLOCK(inp);
2525                         error =
2526                             sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2527                         if (error)
2528                                 break;
2529                         buf[sopt->sopt_valsize] = '\0';
2530                         INP_WLOCK_RECHECK(inp);
2531                         if (sopt->sopt_name == TCP_LOGDUMP) {
2532                                 error = tcp_log_dump_tp_logbuf(tp, buf,
2533                                     M_WAITOK, true);
2534                                 INP_WUNLOCK(inp);
2535                         } else {
2536                                 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2537                                 /*
2538                                  * tcp_log_dump_tp_bucket_logbufs() drops the
2539                                  * INP lock.
2540                                  */
2541                         }
2542                         break;
2543 #endif
2544
2545                 default:
2546                         INP_WUNLOCK(inp);
2547                         error = ENOPROTOOPT;
2548                         break;
2549                 }
2550                 break;
2551
2552         case SOPT_GET:
2553                 tp = intotcpcb(inp);
2554                 switch (sopt->sopt_name) {
2555 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2556                 case TCP_MD5SIG:
2557                         if (!TCPMD5_ENABLED()) {
2558                                 INP_WUNLOCK(inp);
2559                                 return (ENOPROTOOPT);
2560                         }
2561                         error = TCPMD5_PCBCTL(inp, sopt);
2562                         break;
2563 #endif
2564
2565                 case TCP_NODELAY:
2566                         optval = tp->t_flags & TF_NODELAY;
2567                         INP_WUNLOCK(inp);
2568                         error = sooptcopyout(sopt, &optval, sizeof optval);
2569                         break;
2570                 case TCP_MAXSEG:
2571                         optval = tp->t_maxseg;
2572                         INP_WUNLOCK(inp);
2573                         error = sooptcopyout(sopt, &optval, sizeof optval);
2574                         break;
2575                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2576                         optval = ntohs(tp->t_port);
2577                         INP_WUNLOCK(inp);
2578                         error = sooptcopyout(sopt, &optval, sizeof optval);
2579                         break;
2580                 case TCP_NOOPT:
2581                         optval = tp->t_flags & TF_NOOPT;
2582                         INP_WUNLOCK(inp);
2583                         error = sooptcopyout(sopt, &optval, sizeof optval);
2584                         break;
2585                 case TCP_NOPUSH:
2586                         optval = tp->t_flags & TF_NOPUSH;
2587                         INP_WUNLOCK(inp);
2588                         error = sooptcopyout(sopt, &optval, sizeof optval);
2589                         break;
2590                 case TCP_INFO:
2591                         tcp_fill_info(tp, &ti);
2592                         INP_WUNLOCK(inp);
2593                         error = sooptcopyout(sopt, &ti, sizeof ti);
2594                         break;
2595                 case TCP_STATS:
2596                         {
2597 #ifdef STATS
2598                         int nheld;
2599                         TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2600
2601                         error = 0;
2602                         socklen_t outsbsz = sopt->sopt_valsize;
2603                         if (tp->t_stats == NULL)
2604                                 error = ENOENT;
2605                         else if (outsbsz >= tp->t_stats->cursz)
2606                                 outsbsz = tp->t_stats->cursz;
2607                         else if (outsbsz >= sizeof(struct statsblob))
2608                                 outsbsz = sizeof(struct statsblob);
2609                         else
2610                                 error = EINVAL;
2611                         INP_WUNLOCK(inp);
2612                         if (error)
2613                                 break;
2614
2615                         sbp = sopt->sopt_val;
2616                         nheld = atop(round_page(((vm_offset_t)sbp) +
2617                             (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2618                         vm_page_t ma[nheld];
2619                         if (vm_fault_quick_hold_pages(
2620                             &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2621                             outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2622                             nheld) < 0) {
2623                                 error = EFAULT;
2624                                 break;
2625                         }
2626
2627                         if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2628                             SIZEOF_MEMBER(struct statsblob, flags))))
2629                                 goto unhold;
2630
2631                         INP_WLOCK_RECHECK(inp);
2632                         error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2633                             sbflags | SB_CLONE_USRDSTNOFAULT);
2634                         INP_WUNLOCK(inp);
2635                         sopt->sopt_valsize = outsbsz;
2636 unhold:
2637                         vm_page_unhold_pages(ma, nheld);
2638 #else
2639                         INP_WUNLOCK(inp);
2640                         error = EOPNOTSUPP;
2641 #endif /* !STATS */
2642                         break;
2643                         }
2644                 case TCP_CONGESTION:
2645                         len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2646                         INP_WUNLOCK(inp);
2647                         error = sooptcopyout(sopt, buf, len + 1);
2648                         break;
2649                 case TCP_KEEPIDLE:
2650                 case TCP_KEEPINTVL:
2651                 case TCP_KEEPINIT:
2652                 case TCP_KEEPCNT:
2653                         switch (sopt->sopt_name) {
2654                         case TCP_KEEPIDLE:
2655                                 ui = TP_KEEPIDLE(tp) / hz;
2656                                 break;
2657                         case TCP_KEEPINTVL:
2658                                 ui = TP_KEEPINTVL(tp) / hz;
2659                                 break;
2660                         case TCP_KEEPINIT:
2661                                 ui = TP_KEEPINIT(tp) / hz;
2662                                 break;
2663                         case TCP_KEEPCNT:
2664                                 ui = TP_KEEPCNT(tp);
2665                                 break;
2666                         }
2667                         INP_WUNLOCK(inp);
2668                         error = sooptcopyout(sopt, &ui, sizeof(ui));
2669                         break;
2670 #ifdef TCPPCAP
2671                 case TCP_PCAP_OUT:
2672                 case TCP_PCAP_IN:
2673                         optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2674                                         &(tp->t_outpkts) : &(tp->t_inpkts));
2675                         INP_WUNLOCK(inp);
2676                         error = sooptcopyout(sopt, &optval, sizeof optval);
2677                         break;
2678 #endif
2679                 case TCP_FASTOPEN:
2680                         optval = tp->t_flags & TF_FASTOPEN;
2681                         INP_WUNLOCK(inp);
2682                         error = sooptcopyout(sopt, &optval, sizeof optval);
2683                         break;
2684 #ifdef TCP_BLACKBOX
2685                 case TCP_LOG:
2686                         optval = tp->t_logstate;
2687                         INP_WUNLOCK(inp);
2688                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2689                         break;
2690                 case TCP_LOGBUF:
2691                         /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2692                         error = tcp_log_getlogbuf(sopt, tp);
2693                         break;
2694                 case TCP_LOGID:
2695                         len = tcp_log_get_id(tp, buf);
2696                         INP_WUNLOCK(inp);
2697                         error = sooptcopyout(sopt, buf, len + 1);
2698                         break;
2699                 case TCP_LOGDUMP:
2700                 case TCP_LOGDUMPID:
2701                         INP_WUNLOCK(inp);
2702                         error = EINVAL;
2703                         break;
2704 #endif
2705 #ifdef KERN_TLS
2706                 case TCP_TXTLS_MODE:
2707                         error = ktls_get_tx_mode(so, &optval);
2708                         INP_WUNLOCK(inp);
2709                         if (error == 0)
2710                                 error = sooptcopyout(sopt, &optval,
2711                                     sizeof(optval));
2712                         break;
2713                 case TCP_RXTLS_MODE:
2714                         error = ktls_get_rx_mode(so, &optval);
2715                         INP_WUNLOCK(inp);
2716                         if (error == 0)
2717                                 error = sooptcopyout(sopt, &optval,
2718                                     sizeof(optval));
2719                         break;
2720 #endif
2721                 case TCP_LRD:
2722                         optval = tp->t_flags & TF_LRD;
2723                         INP_WUNLOCK(inp);
2724                         error = sooptcopyout(sopt, &optval, sizeof optval);
2725                         break;
2726                 default:
2727                         INP_WUNLOCK(inp);
2728                         error = ENOPROTOOPT;
2729                         break;
2730                 }
2731                 break;
2732         }
2733         return (error);
2734 }
2735 #undef INP_WLOCK_RECHECK
2736 #undef INP_WLOCK_RECHECK_CLEANUP
2737
2738 /*
2739  * Initiate (or continue) disconnect.
2740  * If embryonic state, just send reset (once).
2741  * If in ``let data drain'' option and linger null, just drop.
2742  * Otherwise (hard), mark socket disconnecting and drop
2743  * current input data; switch states based on user close, and
2744  * send segment to peer (with FIN).
2745  */
2746 static void
2747 tcp_disconnect(struct tcpcb *tp)
2748 {
2749         struct inpcb *inp = tp->t_inpcb;
2750         struct socket *so = inp->inp_socket;
2751
2752         NET_EPOCH_ASSERT();
2753         INP_WLOCK_ASSERT(inp);
2754
2755         /*
2756          * Neither tcp_close() nor tcp_drop() should return NULL, as the
2757          * socket is still open.
2758          */
2759         if (tp->t_state < TCPS_ESTABLISHED &&
2760             !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2761                 tp = tcp_close(tp);
2762                 KASSERT(tp != NULL,
2763                     ("tcp_disconnect: tcp_close() returned NULL"));
2764         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2765                 tp = tcp_drop(tp, 0);
2766                 KASSERT(tp != NULL,
2767                     ("tcp_disconnect: tcp_drop() returned NULL"));
2768         } else {
2769                 soisdisconnecting(so);
2770                 sbflush(&so->so_rcv);
2771                 tcp_usrclosed(tp);
2772                 if (!(inp->inp_flags & INP_DROPPED))
2773                         /* Ignore stack's drop request, we already at it. */
2774                         (void)tcp_output_nodrop(tp);
2775         }
2776 }
2777
2778 /*
2779  * User issued close, and wish to trail through shutdown states:
2780  * if never received SYN, just forget it.  If got a SYN from peer,
2781  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2782  * If already got a FIN from peer, then almost done; go to LAST_ACK
2783  * state.  In all other cases, have already sent FIN to peer (e.g.
2784  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2785  * for peer to send FIN or not respond to keep-alives, etc.
2786  * We can let the user exit from the close as soon as the FIN is acked.
2787  */
2788 static void
2789 tcp_usrclosed(struct tcpcb *tp)
2790 {
2791
2792         NET_EPOCH_ASSERT();
2793         INP_WLOCK_ASSERT(tp->t_inpcb);
2794
2795         switch (tp->t_state) {
2796         case TCPS_LISTEN:
2797 #ifdef TCP_OFFLOAD
2798                 tcp_offload_listen_stop(tp);
2799 #endif
2800                 tcp_state_change(tp, TCPS_CLOSED);
2801                 /* FALLTHROUGH */
2802         case TCPS_CLOSED:
2803                 tp = tcp_close(tp);
2804                 /*
2805                  * tcp_close() should never return NULL here as the socket is
2806                  * still open.
2807                  */
2808                 KASSERT(tp != NULL,
2809                     ("tcp_usrclosed: tcp_close() returned NULL"));
2810                 break;
2811
2812         case TCPS_SYN_SENT:
2813         case TCPS_SYN_RECEIVED:
2814                 tp->t_flags |= TF_NEEDFIN;
2815                 break;
2816
2817         case TCPS_ESTABLISHED:
2818                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2819                 break;
2820
2821         case TCPS_CLOSE_WAIT:
2822                 tcp_state_change(tp, TCPS_LAST_ACK);
2823                 break;
2824         }
2825         if (tp->t_state >= TCPS_FIN_WAIT_2) {
2826                 soisdisconnected(tp->t_inpcb->inp_socket);
2827                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2828                 if (tp->t_state == TCPS_FIN_WAIT_2) {
2829                         int timeout;
2830
2831                         timeout = (tcp_fast_finwait2_recycle) ?
2832                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
2833                         tcp_timer_activate(tp, TT_2MSL, timeout);
2834                 }
2835         }
2836 }
2837
2838 #ifdef DDB
2839 static void
2840 db_print_indent(int indent)
2841 {
2842         int i;
2843
2844         for (i = 0; i < indent; i++)
2845                 db_printf(" ");
2846 }
2847
2848 static void
2849 db_print_tstate(int t_state)
2850 {
2851
2852         switch (t_state) {
2853         case TCPS_CLOSED:
2854                 db_printf("TCPS_CLOSED");
2855                 return;
2856
2857         case TCPS_LISTEN:
2858                 db_printf("TCPS_LISTEN");
2859                 return;
2860
2861         case TCPS_SYN_SENT:
2862                 db_printf("TCPS_SYN_SENT");
2863                 return;
2864
2865         case TCPS_SYN_RECEIVED:
2866                 db_printf("TCPS_SYN_RECEIVED");
2867                 return;
2868
2869         case TCPS_ESTABLISHED:
2870                 db_printf("TCPS_ESTABLISHED");
2871                 return;
2872
2873         case TCPS_CLOSE_WAIT:
2874                 db_printf("TCPS_CLOSE_WAIT");
2875                 return;
2876
2877         case TCPS_FIN_WAIT_1:
2878                 db_printf("TCPS_FIN_WAIT_1");
2879                 return;
2880
2881         case TCPS_CLOSING:
2882                 db_printf("TCPS_CLOSING");
2883                 return;
2884
2885         case TCPS_LAST_ACK:
2886                 db_printf("TCPS_LAST_ACK");
2887                 return;
2888
2889         case TCPS_FIN_WAIT_2:
2890                 db_printf("TCPS_FIN_WAIT_2");
2891                 return;
2892
2893         case TCPS_TIME_WAIT:
2894                 db_printf("TCPS_TIME_WAIT");
2895                 return;
2896
2897         default:
2898                 db_printf("unknown");
2899                 return;
2900         }
2901 }
2902
2903 static void
2904 db_print_tflags(u_int t_flags)
2905 {
2906         int comma;
2907
2908         comma = 0;
2909         if (t_flags & TF_ACKNOW) {
2910                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2911                 comma = 1;
2912         }
2913         if (t_flags & TF_DELACK) {
2914                 db_printf("%sTF_DELACK", comma ? ", " : "");
2915                 comma = 1;
2916         }
2917         if (t_flags & TF_NODELAY) {
2918                 db_printf("%sTF_NODELAY", comma ? ", " : "");
2919                 comma = 1;
2920         }
2921         if (t_flags & TF_NOOPT) {
2922                 db_printf("%sTF_NOOPT", comma ? ", " : "");
2923                 comma = 1;
2924         }
2925         if (t_flags & TF_SENTFIN) {
2926                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2927                 comma = 1;
2928         }
2929         if (t_flags & TF_REQ_SCALE) {
2930                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2931                 comma = 1;
2932         }
2933         if (t_flags & TF_RCVD_SCALE) {
2934                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2935                 comma = 1;
2936         }
2937         if (t_flags & TF_REQ_TSTMP) {
2938                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2939                 comma = 1;
2940         }
2941         if (t_flags & TF_RCVD_TSTMP) {
2942                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2943                 comma = 1;
2944         }
2945         if (t_flags & TF_SACK_PERMIT) {
2946                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2947                 comma = 1;
2948         }
2949         if (t_flags & TF_NEEDSYN) {
2950                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2951                 comma = 1;
2952         }
2953         if (t_flags & TF_NEEDFIN) {
2954                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2955                 comma = 1;
2956         }
2957         if (t_flags & TF_NOPUSH) {
2958                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2959                 comma = 1;
2960         }
2961         if (t_flags & TF_MORETOCOME) {
2962                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2963                 comma = 1;
2964         }
2965         if (t_flags & TF_LQ_OVERFLOW) {
2966                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2967                 comma = 1;
2968         }
2969         if (t_flags & TF_LASTIDLE) {
2970                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2971                 comma = 1;
2972         }
2973         if (t_flags & TF_RXWIN0SENT) {
2974                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2975                 comma = 1;
2976         }
2977         if (t_flags & TF_FASTRECOVERY) {
2978                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2979                 comma = 1;
2980         }
2981         if (t_flags & TF_CONGRECOVERY) {
2982                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2983                 comma = 1;
2984         }
2985         if (t_flags & TF_WASFRECOVERY) {
2986                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2987                 comma = 1;
2988         }
2989         if (t_flags & TF_SIGNATURE) {
2990                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2991                 comma = 1;
2992         }
2993         if (t_flags & TF_FORCEDATA) {
2994                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2995                 comma = 1;
2996         }
2997         if (t_flags & TF_TSO) {
2998                 db_printf("%sTF_TSO", comma ? ", " : "");
2999                 comma = 1;
3000         }
3001         if (t_flags & TF_FASTOPEN) {
3002                 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
3003                 comma = 1;
3004         }
3005 }
3006
3007 static void
3008 db_print_tflags2(u_int t_flags2)
3009 {
3010         int comma;
3011
3012         comma = 0;
3013         if (t_flags2 & TF2_ECN_PERMIT) {
3014                 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
3015                 comma = 1;
3016         }
3017 }
3018
3019 static void
3020 db_print_toobflags(char t_oobflags)
3021 {
3022         int comma;
3023
3024         comma = 0;
3025         if (t_oobflags & TCPOOB_HAVEDATA) {
3026                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
3027                 comma = 1;
3028         }
3029         if (t_oobflags & TCPOOB_HADDATA) {
3030                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
3031                 comma = 1;
3032         }
3033 }
3034
3035 static void
3036 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
3037 {
3038
3039         db_print_indent(indent);
3040         db_printf("%s at %p\n", name, tp);
3041
3042         indent += 2;
3043
3044         db_print_indent(indent);
3045         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
3046            TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
3047
3048         db_print_indent(indent);
3049         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
3050             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
3051
3052         db_print_indent(indent);
3053         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
3054             &tp->t_timers->tt_delack, tp->t_inpcb);
3055
3056         db_print_indent(indent);
3057         db_printf("t_state: %d (", tp->t_state);
3058         db_print_tstate(tp->t_state);
3059         db_printf(")\n");
3060
3061         db_print_indent(indent);
3062         db_printf("t_flags: 0x%x (", tp->t_flags);
3063         db_print_tflags(tp->t_flags);
3064         db_printf(")\n");
3065
3066         db_print_indent(indent);
3067         db_printf("t_flags2: 0x%x (", tp->t_flags2);
3068         db_print_tflags2(tp->t_flags2);
3069         db_printf(")\n");
3070
3071         db_print_indent(indent);
3072         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
3073             tp->snd_una, tp->snd_max, tp->snd_nxt);
3074
3075         db_print_indent(indent);
3076         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
3077            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
3078
3079         db_print_indent(indent);
3080         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
3081             tp->iss, tp->irs, tp->rcv_nxt);
3082
3083         db_print_indent(indent);
3084         db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
3085             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
3086
3087         db_print_indent(indent);
3088         db_printf("snd_wnd: %u   snd_cwnd: %u\n",
3089            tp->snd_wnd, tp->snd_cwnd);
3090
3091         db_print_indent(indent);
3092         db_printf("snd_ssthresh: %u   snd_recover: "
3093             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
3094
3095         db_print_indent(indent);
3096         db_printf("t_rcvtime: %u   t_startime: %u\n",
3097             tp->t_rcvtime, tp->t_starttime);
3098
3099         db_print_indent(indent);
3100         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
3101             tp->t_rtttime, tp->t_rtseq);
3102
3103         db_print_indent(indent);
3104         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
3105             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
3106
3107         db_print_indent(indent);
3108         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
3109             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
3110             tp->t_rttbest);
3111
3112         db_print_indent(indent);
3113         db_printf("t_rttupdated: %lu   max_sndwnd: %u   t_softerror: %d\n",
3114             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
3115
3116         db_print_indent(indent);
3117         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
3118         db_print_toobflags(tp->t_oobflags);
3119         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
3120
3121         db_print_indent(indent);
3122         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
3123             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
3124
3125         db_print_indent(indent);
3126         db_printf("ts_recent: %u   ts_recent_age: %u\n",
3127             tp->ts_recent, tp->ts_recent_age);
3128
3129         db_print_indent(indent);
3130         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
3131             "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
3132
3133         db_print_indent(indent);
3134         db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
3135             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
3136             tp->snd_recover_prev, tp->t_badrxtwin);
3137
3138         db_print_indent(indent);
3139         db_printf("snd_numholes: %d  snd_holes first: %p\n",
3140             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
3141
3142         db_print_indent(indent);
3143         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d\n",
3144             tp->snd_fack, tp->rcv_numsacks);
3145
3146         /* Skip sackblks, sackhint. */
3147
3148         db_print_indent(indent);
3149         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
3150             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
3151 }
3152
3153 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
3154 {
3155         struct tcpcb *tp;
3156
3157         if (!have_addr) {
3158                 db_printf("usage: show tcpcb <addr>\n");
3159                 return;
3160         }
3161         tp = (struct tcpcb *)addr;
3162
3163         db_print_tcpcb(tp, "tcpcb", 0);
3164 }
3165 #endif