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         NET_EPOCH_ENTER(et);
 900         inp = sotoinpcb(so);
 901         KASSERT(inp != NULL, ("inp == NULL"));
 902         INP_WLOCK(inp);
 903         tp = intotcpcb(inp);
 904         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 905                 error = ECONNRESET;
 906                 goto out;
 907         }
 908         TCPDEBUG1();
 909         socantsendmore(so);
 910         tcp_usrclosed(tp);
 911         if (!(inp->inp_flags & INP_DROPPED))
 912                 error = tcp_output_nodrop(tp);
 913 out:
 914         TCPDEBUG2(PRU_SHUTDOWN);
 915         TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
 916         error = tcp_unlock_or_drop(tp, error);
 917         NET_EPOCH_EXIT(et);
 918
 919         return (error);
 920 }
 921
 922 /*
 923  * After a receive, possibly send window update to peer.
 924  */
 925 static int
 926 tcp_usr_rcvd(struct socket *so, int flags)
 927 {
 928         struct epoch_tracker et;
 929         struct inpcb *inp;
 930         struct tcpcb *tp = NULL;
 931         int outrv = 0, error = 0;
 932
 933         TCPDEBUG0;
 934         inp = sotoinpcb(so);
 935         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 936         INP_WLOCK(inp);
 937         NET_EPOCH_ENTER(et);
 938         tp = intotcpcb(inp);
 939         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 940                 error = ECONNRESET;
 941                 goto out;
 942         }
 943         TCPDEBUG1();
 944         /*
 945          * For passively-created TFO connections, don't attempt a window
 946          * update while still in SYN_RECEIVED as this may trigger an early
 947          * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
 948          * application response data, or failing that, when the DELACK timer
 949          * expires.
 950          */
 951         if (IS_FASTOPEN(tp->t_flags) &&
 952             (tp->t_state == TCPS_SYN_RECEIVED))
 953                 goto out;
 954 #ifdef TCP_OFFLOAD
 955         if (tp->t_flags & TF_TOE)
 956                 tcp_offload_rcvd(tp);
 957         else
 958 #endif
 959                 outrv = tcp_output_nodrop(tp);
 960 out:
 961         TCPDEBUG2(PRU_RCVD);
 962         TCP_PROBE2(debug__user, tp, PRU_RCVD);
 963         (void) tcp_unlock_or_drop(tp, outrv);
 964         NET_EPOCH_EXIT(et);
 965         return (error);
 966 }
 967
 968 /*
 969  * Do a send by putting data in output queue and updating urgent
 970  * marker if URG set.  Possibly send more data.  Unlike the other
 971  * pru_*() routines, the mbuf chains are our responsibility.  We
 972  * must either enqueue them or free them.  The other pru_* routines
 973  * generally are caller-frees.
 974  */
 975 static int
 976 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 977     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 978 {
 979         struct epoch_tracker et;
 980         int error = 0;
 981         struct inpcb *inp;
 982         struct tcpcb *tp = NULL;
 983 #ifdef INET
 984 #ifdef INET6
 985         struct sockaddr_in sin;
 986 #endif
 987         struct sockaddr_in *sinp;
 988 #endif
 989 #ifdef INET6
 990         int isipv6;
 991 #endif
 992         u_int8_t incflagsav;
 993         u_char vflagsav;
 994         bool restoreflags;
 995         TCPDEBUG0;
 996
 997         /*
 998          * We require the pcbinfo "read lock" if we will close the socket
 999          * as part of this call.
1000          */
1001         NET_EPOCH_ENTER(et);
1002         inp = sotoinpcb(so);
1003         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
1004         INP_WLOCK(inp);
1005         tp = intotcpcb(inp);
1006         vflagsav = inp->inp_vflag;
1007         incflagsav = inp->inp_inc.inc_flags;
1008         restoreflags = false;
1009         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1010                 if (control)
1011                         m_freem(control);
1012                 error = ECONNRESET;
1013                 goto out;
1014         }
1015         if (control != NULL) {
1016                 /* TCP doesn't do control messages (rights, creds, etc) */
1017                 if (control->m_len) {
1018                         m_freem(control);
1019                         error = EINVAL;
1020                         goto out;
1021                 }
1022                 m_freem(control);       /* empty control, just free it */
1023                 control = NULL;
1024         }
1025         if ((flags & PRUS_OOB) != 0 &&
1026             (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
1027                 goto out;
1028
1029         TCPDEBUG1();
1030         if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
1031                 if (tp->t_state == TCPS_LISTEN) {
1032                         error = EINVAL;
1033                         goto out;
1034                 }
1035                 switch (nam->sa_family) {
1036 #ifdef INET
1037                 case AF_INET:
1038                         sinp = (struct sockaddr_in *)nam;
1039                         if (sinp->sin_len != sizeof(struct sockaddr_in)) {
1040                                 error = EINVAL;
1041                                 goto out;
1042                         }
1043                         if ((inp->inp_vflag & INP_IPV6) != 0) {
1044                                 error = EAFNOSUPPORT;
1045                                 goto out;
1046                         }
1047                         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
1048                                 error = EAFNOSUPPORT;
1049                                 goto out;
1050                         }
1051                         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
1052                                 error = EACCES;
1053                                 goto out;
1054                         }
1055                         if ((error = prison_remote_ip4(td->td_ucred,
1056                             &sinp->sin_addr)))
1057                                 goto out;
1058 #ifdef INET6
1059                         isipv6 = 0;
1060 #endif
1061                         break;
1062 #endif /* INET */
1063 #ifdef INET6
1064                 case AF_INET6:
1065                 {
1066                         struct sockaddr_in6 *sin6;
1067
1068                         sin6 = (struct sockaddr_in6 *)nam;
1069                         if (sin6->sin6_len != sizeof(*sin6)) {
1070                                 error = EINVAL;
1071                                 goto out;
1072                         }
1073                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1074                                 error = EAFNOSUPPORT;
1075                                 goto out;
1076                         }
1077                         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1078                                 error = EAFNOSUPPORT;
1079                                 goto out;
1080                         }
1081                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1082 #ifdef INET
1083                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1084                                         error = EINVAL;
1085                                         goto out;
1086                                 }
1087                                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1088                                         error = EAFNOSUPPORT;
1089                                         goto out;
1090                                 }
1091                                 restoreflags = true;
1092                                 inp->inp_vflag &= ~INP_IPV6;
1093                                 sinp = &sin;
1094                                 in6_sin6_2_sin(sinp, sin6);
1095                                 if (IN_MULTICAST(
1096                                     ntohl(sinp->sin_addr.s_addr))) {
1097                                         error = EAFNOSUPPORT;
1098                                         goto out;
1099                                 }
1100                                 if ((error = prison_remote_ip4(td->td_ucred,
1101                                     &sinp->sin_addr)))
1102                                         goto out;
1103                                 isipv6 = 0;
1104 #else /* !INET */
1105                                 error = EAFNOSUPPORT;
1106                                 goto out;
1107 #endif /* INET */
1108                         } else {
1109                                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1110                                         error = EAFNOSUPPORT;
1111                                         goto out;
1112                                 }
1113                                 restoreflags = true;
1114                                 inp->inp_vflag &= ~INP_IPV4;
1115                                 inp->inp_inc.inc_flags |= INC_ISIPV6;
1116                                 if ((error = prison_remote_ip6(td->td_ucred,
1117                                     &sin6->sin6_addr)))
1118                                         goto out;
1119                                 isipv6 = 1;
1120                         }
1121                         break;
1122                 }
1123 #endif /* INET6 */
1124                 default:
1125                         error = EAFNOSUPPORT;
1126                         goto out;
1127                 }
1128         }
1129         if (!(flags & PRUS_OOB)) {
1130                 sbappendstream(&so->so_snd, m, flags);
1131                 m = NULL;
1132                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1133                         KASSERT(tp->t_state == TCPS_CLOSED,
1134                             ("%s: tp %p is listening", __func__, tp));
1135
1136                         /*
1137                          * Do implied connect if not yet connected,
1138                          * initialize window to default value, and
1139                          * initialize maxseg using peer's cached MSS.
1140                          */
1141 #ifdef INET6
1142                         if (isipv6)
1143                                 error = tcp6_connect(tp, nam, td);
1144 #endif /* INET6 */
1145 #if defined(INET6) && defined(INET)
1146                         else
1147 #endif
1148 #ifdef INET
1149                                 error = tcp_connect(tp,
1150                                     (struct sockaddr *)sinp, td);
1151 #endif
1152                         /*
1153                          * The bind operation in tcp_connect succeeded. We
1154                          * no longer want to restore the flags if later
1155                          * operations fail.
1156                          */
1157                         if (error == 0 || inp->inp_lport != 0)
1158                                 restoreflags = false;
1159
1160                         if (error) {
1161                                 /* m is freed if PRUS_NOTREADY is unset. */
1162                                 sbflush(&so->so_snd);
1163                                 goto out;
1164                         }
1165                         if (IS_FASTOPEN(tp->t_flags))
1166                                 tcp_fastopen_connect(tp);
1167                         else {
1168                                 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1169                                 tcp_mss(tp, -1);
1170                         }
1171                 }
1172                 if (flags & PRUS_EOF) {
1173                         /*
1174                          * Close the send side of the connection after
1175                          * the data is sent.
1176                          */
1177                         socantsendmore(so);
1178                         tcp_usrclosed(tp);
1179                 }
1180                 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
1181                     ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
1182                     (tp->t_fbyte_out == 0) &&
1183                     (so->so_snd.sb_ccc > 0)) {
1184                         tp->t_fbyte_out = ticks;
1185                         if (tp->t_fbyte_out == 0)
1186                                 tp->t_fbyte_out = 1;
1187                         if (tp->t_fbyte_out && tp->t_fbyte_in)
1188                                 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
1189                 }
1190                 if (!(inp->inp_flags & INP_DROPPED) &&
1191                     !(flags & PRUS_NOTREADY)) {
1192                         if (flags & PRUS_MORETOCOME)
1193                                 tp->t_flags |= TF_MORETOCOME;
1194                         error = tcp_output_nodrop(tp);
1195                         if (flags & PRUS_MORETOCOME)
1196                                 tp->t_flags &= ~TF_MORETOCOME;
1197                 }
1198         } else {
1199                 /*
1200                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1201                  */
1202                 SOCKBUF_LOCK(&so->so_snd);
1203                 if (sbspace(&so->so_snd) < -512) {
1204                         SOCKBUF_UNLOCK(&so->so_snd);
1205                         error = ENOBUFS;
1206                         goto out;
1207                 }
1208                 /*
1209                  * According to RFC961 (Assigned Protocols),
1210                  * the urgent pointer points to the last octet
1211                  * of urgent data.  We continue, however,
1212                  * to consider it to indicate the first octet
1213                  * of data past the urgent section.
1214                  * Otherwise, snd_up should be one lower.
1215                  */
1216                 sbappendstream_locked(&so->so_snd, m, flags);
1217                 SOCKBUF_UNLOCK(&so->so_snd);
1218                 m = NULL;
1219                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1220                         /*
1221                          * Do implied connect if not yet connected,
1222                          * initialize window to default value, and
1223                          * initialize maxseg using peer's cached MSS.
1224                          */
1225
1226                         /*
1227                          * Not going to contemplate SYN|URG
1228                          */
1229                         if (IS_FASTOPEN(tp->t_flags))
1230                                 tp->t_flags &= ~TF_FASTOPEN;
1231 #ifdef INET6
1232                         if (isipv6)
1233                                 error = tcp6_connect(tp, nam, td);
1234 #endif /* INET6 */
1235 #if defined(INET6) && defined(INET)
1236                         else
1237 #endif
1238 #ifdef INET
1239                                 error = tcp_connect(tp,
1240                                     (struct sockaddr *)sinp, td);
1241 #endif
1242                         /*
1243                          * The bind operation in tcp_connect succeeded. We
1244                          * no longer want to restore the flags if later
1245                          * operations fail.
1246                          */
1247                         if (error == 0 || inp->inp_lport != 0)
1248                                 restoreflags = false;
1249
1250                         if (error != 0) {
1251                                 /* m is freed if PRUS_NOTREADY is unset. */
1252                                 sbflush(&so->so_snd);
1253                                 goto out;
1254                         }
1255                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
1256                         tcp_mss(tp, -1);
1257                 }
1258                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1259                 if ((flags & PRUS_NOTREADY) == 0) {
1260                         tp->t_flags |= TF_FORCEDATA;
1261                         error = tcp_output_nodrop(tp);
1262                         tp->t_flags &= ~TF_FORCEDATA;
1263                 }
1264         }
1265         TCP_LOG_EVENT(tp, NULL,
1266             &inp->inp_socket->so_rcv,
1267             &inp->inp_socket->so_snd,
1268             TCP_LOG_USERSEND, error,
1269             0, NULL, false);
1270
1271 out:
1272         /*
1273          * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
1274          * responsible for freeing memory.
1275          */
1276         if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1277                 m_freem(m);
1278
1279         /*
1280          * If the request was unsuccessful and we changed flags,
1281          * restore the original flags.
1282          */
1283         if (error != 0 && restoreflags) {
1284                 inp->inp_vflag = vflagsav;
1285                 inp->inp_inc.inc_flags = incflagsav;
1286         }
1287         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1288                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1289         TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1290                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1291         error = tcp_unlock_or_drop(tp, error);
1292         NET_EPOCH_EXIT(et);
1293         return (error);
1294 }
1295
1296 static int
1297 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1298 {
1299         struct epoch_tracker et;
1300         struct inpcb *inp;
1301         struct tcpcb *tp;
1302         int error;
1303
1304         inp = sotoinpcb(so);
1305         INP_WLOCK(inp);
1306         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1307                 INP_WUNLOCK(inp);
1308                 mb_free_notready(m, count);
1309                 return (ECONNRESET);
1310         }
1311         tp = intotcpcb(inp);
1312
1313         SOCKBUF_LOCK(&so->so_snd);
1314         error = sbready(&so->so_snd, m, count);
1315         SOCKBUF_UNLOCK(&so->so_snd);
1316         if (error) {
1317                 INP_WUNLOCK(inp);
1318                 return (error);
1319         }
1320         NET_EPOCH_ENTER(et);
1321         error = tcp_output_unlock(tp);
1322         NET_EPOCH_EXIT(et);
1323
1324         return (error);
1325 }
1326
1327 /*
1328  * Abort the TCP.  Drop the connection abruptly.
1329  */
1330 static void
1331 tcp_usr_abort(struct socket *so)
1332 {
1333         struct inpcb *inp;
1334         struct tcpcb *tp = NULL;
1335         struct epoch_tracker et;
1336         TCPDEBUG0;
1337
1338         inp = sotoinpcb(so);
1339         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1340
1341         NET_EPOCH_ENTER(et);
1342         INP_WLOCK(inp);
1343         KASSERT(inp->inp_socket != NULL,
1344             ("tcp_usr_abort: inp_socket == NULL"));
1345
1346         /*
1347          * If we still have full TCP state, and we're not dropped, drop.
1348          */
1349         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1350             !(inp->inp_flags & INP_DROPPED)) {
1351                 tp = intotcpcb(inp);
1352                 TCPDEBUG1();
1353                 tp = tcp_drop(tp, ECONNABORTED);
1354                 if (tp == NULL)
1355                         goto dropped;
1356                 TCPDEBUG2(PRU_ABORT);
1357                 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1358         }
1359         if (!(inp->inp_flags & INP_DROPPED)) {
1360                 SOCK_LOCK(so);
1361                 so->so_state |= SS_PROTOREF;
1362                 SOCK_UNLOCK(so);
1363                 inp->inp_flags |= INP_SOCKREF;
1364         }
1365         INP_WUNLOCK(inp);
1366 dropped:
1367         NET_EPOCH_EXIT(et);
1368 }
1369
1370 /*
1371  * TCP socket is closed.  Start friendly disconnect.
1372  */
1373 static void
1374 tcp_usr_close(struct socket *so)
1375 {
1376         struct inpcb *inp;
1377         struct tcpcb *tp = NULL;
1378         struct epoch_tracker et;
1379         TCPDEBUG0;
1380
1381         inp = sotoinpcb(so);
1382         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1383
1384         NET_EPOCH_ENTER(et);
1385         INP_WLOCK(inp);
1386         KASSERT(inp->inp_socket != NULL,
1387             ("tcp_usr_close: inp_socket == NULL"));
1388
1389         /*
1390          * If we still have full TCP state, and we're not dropped, initiate
1391          * a disconnect.
1392          */
1393         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1394             !(inp->inp_flags & INP_DROPPED)) {
1395                 tp = intotcpcb(inp);
1396                 TCPDEBUG1();
1397                 tcp_disconnect(tp);
1398                 TCPDEBUG2(PRU_CLOSE);
1399                 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1400         }
1401         if (!(inp->inp_flags & INP_DROPPED)) {
1402                 SOCK_LOCK(so);
1403                 so->so_state |= SS_PROTOREF;
1404                 SOCK_UNLOCK(so);
1405                 inp->inp_flags |= INP_SOCKREF;
1406         }
1407         INP_WUNLOCK(inp);
1408         NET_EPOCH_EXIT(et);
1409 }
1410
1411 static int
1412 tcp_pru_options_support(struct tcpcb *tp, int flags)
1413 {
1414         /*
1415          * If the specific TCP stack has a pru_options
1416          * specified then it does not always support
1417          * all the PRU_XX options and we must ask it.
1418          * If the function is not specified then all
1419          * of the PRU_XX options are supported.
1420          */
1421         int ret = 0;
1422
1423         if (tp->t_fb->tfb_pru_options) {
1424                 ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1425         }
1426         return (ret);
1427 }
1428
1429 /*
1430  * Receive out-of-band data.
1431  */
1432 static int
1433 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1434 {
1435         int error = 0;
1436         struct inpcb *inp;
1437         struct tcpcb *tp = NULL;
1438
1439         TCPDEBUG0;
1440         inp = sotoinpcb(so);
1441         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1442         INP_WLOCK(inp);
1443         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1444                 error = ECONNRESET;
1445                 goto out;
1446         }
1447         tp = intotcpcb(inp);
1448         error = tcp_pru_options_support(tp, PRUS_OOB);
1449         if (error) {
1450                 goto out;
1451         }
1452         TCPDEBUG1();
1453         if ((so->so_oobmark == 0 &&
1454              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1455             so->so_options & SO_OOBINLINE ||
1456             tp->t_oobflags & TCPOOB_HADDATA) {
1457                 error = EINVAL;
1458                 goto out;
1459         }
1460         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1461                 error = EWOULDBLOCK;
1462                 goto out;
1463         }
1464         m->m_len = 1;
1465         *mtod(m, caddr_t) = tp->t_iobc;
1466         if ((flags & MSG_PEEK) == 0)
1467                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1468
1469 out:
1470         TCPDEBUG2(PRU_RCVOOB);
1471         TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1472         INP_WUNLOCK(inp);
1473         return (error);
1474 }
1475
1476 #ifdef INET
1477 struct pr_usrreqs tcp_usrreqs = {
1478         .pru_abort =            tcp_usr_abort,
1479         .pru_accept =           tcp_usr_accept,
1480         .pru_attach =           tcp_usr_attach,
1481         .pru_bind =             tcp_usr_bind,
1482         .pru_connect =          tcp_usr_connect,
1483         .pru_control =          in_control,
1484         .pru_detach =           tcp_usr_detach,
1485         .pru_disconnect =       tcp_usr_disconnect,
1486         .pru_listen =           tcp_usr_listen,
1487         .pru_peeraddr =         in_getpeeraddr,
1488         .pru_rcvd =             tcp_usr_rcvd,
1489         .pru_rcvoob =           tcp_usr_rcvoob,
1490         .pru_send =             tcp_usr_send,
1491         .pru_ready =            tcp_usr_ready,
1492         .pru_shutdown =         tcp_usr_shutdown,
1493         .pru_sockaddr =         in_getsockaddr,
1494         .pru_sosetlabel =       in_pcbsosetlabel,
1495         .pru_close =            tcp_usr_close,
1496 };
1497 #endif /* INET */
1498
1499 #ifdef INET6
1500 struct pr_usrreqs tcp6_usrreqs = {
1501         .pru_abort =            tcp_usr_abort,
1502         .pru_accept =           tcp6_usr_accept,
1503         .pru_attach =           tcp_usr_attach,
1504         .pru_bind =             tcp6_usr_bind,
1505         .pru_connect =          tcp6_usr_connect,
1506         .pru_control =          in6_control,
1507         .pru_detach =           tcp_usr_detach,
1508         .pru_disconnect =       tcp_usr_disconnect,
1509         .pru_listen =           tcp6_usr_listen,
1510         .pru_peeraddr =         in6_mapped_peeraddr,
1511         .pru_rcvd =             tcp_usr_rcvd,
1512         .pru_rcvoob =           tcp_usr_rcvoob,
1513         .pru_send =             tcp_usr_send,
1514         .pru_ready =            tcp_usr_ready,
1515         .pru_shutdown =         tcp_usr_shutdown,
1516         .pru_sockaddr =         in6_mapped_sockaddr,
1517         .pru_sosetlabel =       in_pcbsosetlabel,
1518         .pru_close =            tcp_usr_close,
1519 };
1520 #endif /* INET6 */
1521
1522 #ifdef INET
1523 /*
1524  * Common subroutine to open a TCP connection to remote host specified
1525  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1526  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1527  * to choose a local host address (interface).  If there is an existing
1528  * incarnation of the same connection in TIME-WAIT state and if the remote
1529  * host was sending CC options and if the connection duration was < MSL, then
1530  * truncate the previous TIME-WAIT state and proceed.
1531  * Initialize connection parameters and enter SYN-SENT state.
1532  */
1533 static int
1534 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1535 {
1536         struct inpcb *inp = tp->t_inpcb, *oinp;
1537         struct socket *so = inp->inp_socket;
1538         struct in_addr laddr;
1539         u_short lport;
1540         int error;
1541
1542         NET_EPOCH_ASSERT();
1543         INP_WLOCK_ASSERT(inp);
1544         INP_HASH_WLOCK(&V_tcbinfo);
1545
1546         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1547                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1548                 if (error)
1549                         goto out;
1550         }
1551
1552         /*
1553          * Cannot simply call in_pcbconnect, because there might be an
1554          * earlier incarnation of this same connection still in
1555          * TIME_WAIT state, creating an ADDRINUSE error.
1556          */
1557         laddr = inp->inp_laddr;
1558         lport = inp->inp_lport;
1559         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1560             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1561         if (error && oinp == NULL)
1562                 goto out;
1563         if (oinp) {
1564                 error = EADDRINUSE;
1565                 goto out;
1566         }
1567         /* Handle initial bind if it hadn't been done in advance. */
1568         if (inp->inp_lport == 0) {
1569                 inp->inp_lport = lport;
1570                 if (in_pcbinshash(inp) != 0) {
1571                         inp->inp_lport = 0;
1572                         error = EAGAIN;
1573                         goto out;
1574                 }
1575         }
1576         inp->inp_laddr = laddr;
1577         in_pcbrehash(inp);
1578         INP_HASH_WUNLOCK(&V_tcbinfo);
1579
1580         /*
1581          * Compute window scaling to request:
1582          * Scale to fit into sweet spot.  See tcp_syncache.c.
1583          * XXX: This should move to tcp_output().
1584          */
1585         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1586             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1587                 tp->request_r_scale++;
1588
1589         soisconnecting(so);
1590         TCPSTAT_INC(tcps_connattempt);
1591         tcp_state_change(tp, TCPS_SYN_SENT);
1592         tp->iss = tcp_new_isn(&inp->inp_inc);
1593         if (tp->t_flags & TF_REQ_TSTMP)
1594                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1595         tcp_sendseqinit(tp);
1596
1597         return 0;
1598
1599 out:
1600         INP_HASH_WUNLOCK(&V_tcbinfo);
1601         return (error);
1602 }
1603 #endif /* INET */
1604
1605 #ifdef INET6
1606 static int
1607 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1608 {
1609         struct inpcb *inp = tp->t_inpcb;
1610         int error;
1611
1612         INP_WLOCK_ASSERT(inp);
1613         INP_HASH_WLOCK(&V_tcbinfo);
1614
1615         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1616                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1617                 if (error)
1618                         goto out;
1619         }
1620         error = in6_pcbconnect(inp, nam, td->td_ucred);
1621         if (error != 0)
1622                 goto out;
1623         INP_HASH_WUNLOCK(&V_tcbinfo);
1624
1625         /* Compute window scaling to request.  */
1626         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1627             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1628                 tp->request_r_scale++;
1629
1630         soisconnecting(inp->inp_socket);
1631         TCPSTAT_INC(tcps_connattempt);
1632         tcp_state_change(tp, TCPS_SYN_SENT);
1633         tp->iss = tcp_new_isn(&inp->inp_inc);
1634         if (tp->t_flags & TF_REQ_TSTMP)
1635                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1636         tcp_sendseqinit(tp);
1637
1638         return 0;
1639
1640 out:
1641         INP_HASH_WUNLOCK(&V_tcbinfo);
1642         return error;
1643 }
1644 #endif /* INET6 */
1645
1646 /*
1647  * Export TCP internal state information via a struct tcp_info, based on the
1648  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1649  * (TCP state machine, etc).  We export all information using FreeBSD-native
1650  * constants -- for example, the numeric values for tcpi_state will differ
1651  * from Linux.
1652  */
1653 static void
1654 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1655 {
1656
1657         INP_WLOCK_ASSERT(tp->t_inpcb);
1658         bzero(ti, sizeof(*ti));
1659
1660         ti->tcpi_state = tp->t_state;
1661         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1662                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1663         if (tp->t_flags & TF_SACK_PERMIT)
1664                 ti->tcpi_options |= TCPI_OPT_SACK;
1665         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1666                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1667                 ti->tcpi_snd_wscale = tp->snd_scale;
1668                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1669         }
1670         if (tp->t_flags2 & TF2_ECN_PERMIT)
1671                 ti->tcpi_options |= TCPI_OPT_ECN;
1672
1673         ti->tcpi_rto = tp->t_rxtcur * tick;
1674         ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1675         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1676         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1677
1678         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1679         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1680
1681         /*
1682          * FreeBSD-specific extension fields for tcp_info.
1683          */
1684         ti->tcpi_rcv_space = tp->rcv_wnd;
1685         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1686         ti->tcpi_snd_wnd = tp->snd_wnd;
1687         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1688         ti->tcpi_snd_nxt = tp->snd_nxt;
1689         ti->tcpi_snd_mss = tp->t_maxseg;
1690         ti->tcpi_rcv_mss = tp->t_maxseg;
1691         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1692         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1693         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1694 #ifdef TCP_OFFLOAD
1695         if (tp->t_flags & TF_TOE) {
1696                 ti->tcpi_options |= TCPI_OPT_TOE;
1697                 tcp_offload_tcp_info(tp, ti);
1698         }
1699 #endif
1700 }
1701
1702 /*
1703  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1704  * socket option arguments.  When it re-acquires the lock after the copy, it
1705  * has to revalidate that the connection is still valid for the socket
1706  * option.
1707  */
1708 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do {                    \
1709         INP_WLOCK(inp);                                                 \
1710         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1711                 INP_WUNLOCK(inp);                                       \
1712                 cleanup;                                                \
1713                 return (ECONNRESET);                                    \
1714         }                                                               \
1715         tp = intotcpcb(inp);                                            \
1716 } while(0)
1717 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1718
1719 static int
1720 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt)
1721 {
1722         struct  tcpcb *tp = intotcpcb(inp);
1723         int error = 0;
1724
1725         MPASS(sopt->sopt_dir == SOPT_SET);
1726
1727         if (sopt->sopt_level != IPPROTO_TCP) {
1728 #ifdef INET6
1729                 if (inp->inp_vflag & INP_IPV6PROTO)
1730                         error = ip6_ctloutput(inp->inp_socket, sopt);
1731 #endif
1732 #if defined(INET6) && defined(INET)
1733                 else
1734 #endif
1735 #ifdef INET
1736                         error = ip_ctloutput(inp->inp_socket, sopt);
1737 #endif
1738                 /*
1739                  * When an IP-level socket option affects TCP, pass control
1740                  * down to stack tfb_tcp_ctloutput, otherwise return what
1741                  * IP level returned.
1742                  */
1743                 switch (sopt->sopt_level) {
1744 #ifdef INET6
1745                 case IPPROTO_IPV6:
1746                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
1747                                 return (error);
1748                         switch (sopt->sopt_name) {
1749                         case IPV6_TCLASS:
1750                                 /* Notify tcp stacks that care (e.g. RACK). */
1751                                 break;
1752                         case IPV6_USE_MIN_MTU:
1753                                 /* Update t_maxseg accordingly. */
1754                                 break;
1755                         default:
1756                                 return (error);
1757                         }
1758                         break;
1759 #endif
1760 #ifdef INET
1761                 case IPPROTO_IP:
1762                         switch (sopt->sopt_name) {
1763                         case IP_TOS:
1764                         case IP_TTL:
1765                                 /* Notify tcp stacks that care (e.g. RACK). */
1766                                 break;
1767                         default:
1768                                 return (error);
1769                         }
1770                         break;
1771 #endif
1772                 default:
1773                         return (error);
1774                 }
1775         } else if (sopt->sopt_name == TCP_FUNCTION_BLK) {
1776                 /*
1777                  * Protect the TCP option TCP_FUNCTION_BLK so
1778                  * that a sub-function can *never* overwrite this.
1779                  */
1780                 struct tcp_function_set fsn;
1781                 struct tcp_function_block *blk;
1782
1783                 error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn);
1784                 if (error)
1785                         return (error);
1786
1787                 INP_WLOCK(inp);
1788                 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1789                         INP_WUNLOCK(inp);
1790                         return (ECONNRESET);
1791                 }
1792                 tp = intotcpcb(inp);
1793
1794                 blk = find_and_ref_tcp_functions(&fsn);
1795                 if (blk == NULL) {
1796                         INP_WUNLOCK(inp);
1797                         return (ENOENT);
1798                 }
1799                 if (tp->t_fb == blk) {
1800                         /* You already have this */
1801                         refcount_release(&blk->tfb_refcnt);
1802                         INP_WUNLOCK(inp);
1803                         return (0);
1804                 }
1805                 if (tp->t_state != TCPS_CLOSED) {
1806                         /*
1807                          * The user has advanced the state
1808                          * past the initial point, we may not
1809                          * be able to switch.
1810                          */
1811                         if (blk->tfb_tcp_handoff_ok != NULL) {
1812                                 /*
1813                                  * Does the stack provide a
1814                                  * query mechanism, if so it may
1815                                  * still be possible?
1816                                  */
1817                                 error = (*blk->tfb_tcp_handoff_ok)(tp);
1818                         } else
1819                                 error = EINVAL;
1820                         if (error) {
1821                                 refcount_release(&blk->tfb_refcnt);
1822                                 INP_WUNLOCK(inp);
1823                                 return(error);
1824                         }
1825                 }
1826                 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1827                         refcount_release(&blk->tfb_refcnt);
1828                         INP_WUNLOCK(inp);
1829                         return (ENOENT);
1830                 }
1831                 /*
1832                  * Release the old refcnt, the
1833                  * lookup acquired a ref on the
1834                  * new one already.
1835                  */
1836                 if (tp->t_fb->tfb_tcp_fb_fini) {
1837                         struct epoch_tracker et;
1838                         /*
1839                          * Tell the stack to cleanup with 0 i.e.
1840                          * the tcb is not going away.
1841                          */
1842                         NET_EPOCH_ENTER(et);
1843                         (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1844                         NET_EPOCH_EXIT(et);
1845                 }
1846 #ifdef TCPHPTS
1847                 /* Assure that we are not on any hpts */
1848                 tcp_hpts_remove(tp->t_inpcb);
1849 #endif
1850                 if (blk->tfb_tcp_fb_init) {
1851                         error = (*blk->tfb_tcp_fb_init)(tp);
1852                         if (error) {
1853                                 refcount_release(&blk->tfb_refcnt);
1854                                 if (tp->t_fb->tfb_tcp_fb_init) {
1855                                         if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0)  {
1856                                                 /* Fall back failed, drop the connection */
1857                                                 INP_WUNLOCK(inp);
1858                                                 soabort(inp->inp_socket);
1859                                                 return(error);
1860                                         }
1861                                 }
1862                                 goto err_out;
1863                         }
1864                 }
1865                 refcount_release(&tp->t_fb->tfb_refcnt);
1866                 tp->t_fb = blk;
1867 #ifdef TCP_OFFLOAD
1868                 if (tp->t_flags & TF_TOE) {
1869                         tcp_offload_ctloutput(tp, sopt->sopt_dir,
1870                              sopt->sopt_name);
1871                 }
1872 #endif
1873 err_out:
1874                 INP_WUNLOCK(inp);
1875                 return (error);
1876         }
1877
1878         INP_WLOCK(inp);
1879         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1880                 INP_WUNLOCK(inp);
1881                 return (ECONNRESET);
1882         }
1883         tp = intotcpcb(inp);
1884
1885         /* Pass in the INP locked, caller must unlock it. */
1886         return (tp->t_fb->tfb_tcp_ctloutput(inp->inp_socket, sopt, inp, tp));
1887 }
1888
1889 static int
1890 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt)
1891 {
1892         int     error = 0;
1893         struct  tcpcb *tp;
1894
1895         MPASS(sopt->sopt_dir == SOPT_GET);
1896
1897         if (sopt->sopt_level != IPPROTO_TCP) {
1898 #ifdef INET6
1899                 if (inp->inp_vflag & INP_IPV6PROTO)
1900                         error = ip6_ctloutput(inp->inp_socket, sopt);
1901 #endif /* INET6 */
1902 #if defined(INET6) && defined(INET)
1903                 else
1904 #endif
1905 #ifdef INET
1906                         error = ip_ctloutput(inp->inp_socket, sopt);
1907 #endif
1908                 return (error);
1909         }
1910         INP_WLOCK(inp);
1911         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1912                 INP_WUNLOCK(inp);
1913                 return (ECONNRESET);
1914         }
1915         tp = intotcpcb(inp);
1916         if (((sopt->sopt_name == TCP_FUNCTION_BLK) ||
1917              (sopt->sopt_name == TCP_FUNCTION_ALIAS))) {
1918                 struct tcp_function_set fsn;
1919
1920                 if (sopt->sopt_name == TCP_FUNCTION_ALIAS) {
1921                         memset(&fsn, 0, sizeof(fsn));
1922                         find_tcp_function_alias(tp->t_fb, &fsn);
1923                 } else {
1924                         strncpy(fsn.function_set_name,
1925                             tp->t_fb->tfb_tcp_block_name,
1926                             TCP_FUNCTION_NAME_LEN_MAX);
1927                         fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1928                 }
1929                 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1930                 INP_WUNLOCK(inp);
1931                 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1932                 return (error);
1933         }
1934
1935         /* Pass in the INP locked, caller must unlock it. */
1936         return (tp->t_fb->tfb_tcp_ctloutput(inp->inp_socket, sopt, inp, tp));
1937 }
1938
1939 int
1940 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1941 {
1942         int     error;
1943         struct  inpcb *inp;
1944
1945         error = 0;
1946         inp = sotoinpcb(so);
1947         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1948
1949         if (sopt->sopt_dir == SOPT_SET)
1950                 return (tcp_ctloutput_set(inp, sopt));
1951         else if (sopt->sopt_dir == SOPT_GET)
1952                 return (tcp_ctloutput_get(inp, sopt));
1953         else
1954                 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
1955 }
1956
1957 /*
1958  * If this assert becomes untrue, we need to change the size of the buf
1959  * variable in tcp_default_ctloutput().
1960  */
1961 #ifdef CTASSERT
1962 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1963 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1964 #endif
1965
1966 #ifdef KERN_TLS
1967 static int
1968 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
1969 {
1970         struct tls_enable_v0 tls_v0;
1971         int error;
1972
1973         if (sopt->sopt_valsize == sizeof(tls_v0)) {
1974                 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
1975                     sizeof(tls_v0));
1976                 if (error)
1977                         return (error);
1978                 memset(tls, 0, sizeof(*tls));
1979                 tls->cipher_key = tls_v0.cipher_key;
1980                 tls->iv = tls_v0.iv;
1981                 tls->auth_key = tls_v0.auth_key;
1982                 tls->cipher_algorithm = tls_v0.cipher_algorithm;
1983                 tls->cipher_key_len = tls_v0.cipher_key_len;
1984                 tls->iv_len = tls_v0.iv_len;
1985                 tls->auth_algorithm = tls_v0.auth_algorithm;
1986                 tls->auth_key_len = tls_v0.auth_key_len;
1987                 tls->flags = tls_v0.flags;
1988                 tls->tls_vmajor = tls_v0.tls_vmajor;
1989                 tls->tls_vminor = tls_v0.tls_vminor;
1990                 return (0);
1991         }
1992
1993         return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
1994 }
1995 #endif
1996
1997 extern struct cc_algo newreno_cc_algo;
1998
1999 static int
2000 tcp_congestion(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
2001 {
2002         struct cc_algo *algo;
2003         void *ptr = NULL;
2004         struct cc_var cc_mem;
2005         char    buf[TCP_CA_NAME_MAX];
2006         size_t mem_sz;
2007         int error;
2008
2009         INP_WUNLOCK(inp);
2010         error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
2011         if (error)
2012                 return(error);
2013         buf[sopt->sopt_valsize] = '\0';
2014         CC_LIST_RLOCK();
2015         STAILQ_FOREACH(algo, &cc_list, entries)
2016                 if (strncmp(buf, algo->name,
2017                             TCP_CA_NAME_MAX) == 0) {
2018                         if (algo->flags & CC_MODULE_BEING_REMOVED) {
2019                                 /* We can't "see" modules being unloaded */
2020                                 continue;
2021                         }
2022                         break;
2023                 }
2024         if (algo == NULL) {
2025                 CC_LIST_RUNLOCK();
2026                 return(ESRCH);
2027         }
2028 do_over:
2029         if (algo->cb_init != NULL) {
2030                 /* We can now pre-get the memory for the CC */
2031                 mem_sz = (*algo->cc_data_sz)();
2032                 if (mem_sz == 0) {
2033                         goto no_mem_needed;
2034                 }
2035                 CC_LIST_RUNLOCK();
2036                 ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK);
2037                 CC_LIST_RLOCK();
2038                 STAILQ_FOREACH(algo, &cc_list, entries)
2039                         if (strncmp(buf, algo->name,
2040                                     TCP_CA_NAME_MAX) == 0)
2041                                 break;
2042                 if (algo == NULL) {
2043                         if (ptr)
2044                                 free(ptr, M_CC_MEM);
2045                         CC_LIST_RUNLOCK();
2046                         return(ESRCH);
2047                 }
2048         } else {
2049 no_mem_needed:
2050                 mem_sz = 0;
2051                 ptr = NULL;
2052         }
2053         /*
2054          * Make sure its all clean and zero and also get
2055          * back the inplock.
2056          */
2057         memset(&cc_mem, 0, sizeof(cc_mem));
2058         if (mem_sz != (*algo->cc_data_sz)()) {
2059                 if (ptr)
2060                         free(ptr, M_CC_MEM);
2061                 goto do_over;
2062         }
2063         INP_WLOCK(inp);
2064         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
2065                 INP_WUNLOCK(inp);
2066                 CC_LIST_RUNLOCK();
2067                 free(ptr, M_CC_MEM);
2068                 return (ECONNRESET);
2069         }
2070         tp = intotcpcb(inp);
2071         if (ptr != NULL)
2072                 memset(ptr, 0, mem_sz);
2073         CC_LIST_RUNLOCK();
2074         cc_mem.ccvc.tcp = tp;
2075         /*
2076          * We once again hold a write lock over the tcb so it's
2077          * safe to do these things without ordering concerns.
2078          * Note here we init into stack memory.
2079          */
2080         if (algo->cb_init != NULL)
2081                 error = algo->cb_init(&cc_mem, ptr);
2082         else
2083                 error = 0;
2084         /*
2085          * The CC algorithms, when given their memory
2086          * should not fail we could in theory have a
2087          * KASSERT here.
2088          */
2089         if (error == 0) {
2090                 /*
2091                  * Touchdown, lets go ahead and move the
2092                  * connection to the new CC module by
2093                  * copying in the cc_mem after we call
2094                  * the old ones cleanup (if any).
2095                  */
2096                 if (CC_ALGO(tp)->cb_destroy != NULL)
2097                         CC_ALGO(tp)->cb_destroy(tp->ccv);
2098                 memcpy(tp->ccv, &cc_mem, sizeof(struct cc_var));
2099                 tp->cc_algo = algo;
2100                 /* Ok now are we where we have gotten past any conn_init? */
2101                 if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) {
2102                         /* Yep run the connection init for the new CC */
2103                         CC_ALGO(tp)->conn_init(tp->ccv);
2104                 }
2105         } else if (ptr)
2106                 free(ptr, M_CC_MEM);
2107         INP_WUNLOCK(inp);
2108         return (error);
2109 }
2110
2111 int
2112 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
2113 {
2114         int     error, opt, optval;
2115         u_int   ui;
2116         struct  tcp_info ti;
2117 #ifdef KERN_TLS
2118         struct tls_enable tls;
2119 #endif
2120         char    *pbuf, buf[TCP_LOG_ID_LEN];
2121 #ifdef STATS
2122         struct statsblob *sbp;
2123 #endif
2124         size_t  len;
2125
2126         INP_WLOCK_ASSERT(inp);
2127
2128         switch (sopt->sopt_level) {
2129 #ifdef INET6
2130         case IPPROTO_IPV6:
2131                 MPASS(inp->inp_vflag & INP_IPV6PROTO);
2132                 switch (sopt->sopt_name) {
2133                 case IPV6_USE_MIN_MTU:
2134                         tcp6_use_min_mtu(tp);
2135                         /* FALLTHROUGH */
2136                 }
2137                 INP_WUNLOCK(inp);
2138                 return (0);
2139 #endif
2140 #ifdef INET
2141         case IPPROTO_IP:
2142                 INP_WUNLOCK(inp);
2143                 return (0);
2144 #endif
2145         }
2146
2147         /*
2148          * For TCP_CCALGOOPT forward the control to CC module, for both
2149          * SOPT_SET and SOPT_GET.
2150          */
2151         switch (sopt->sopt_name) {
2152         case TCP_CCALGOOPT:
2153                 INP_WUNLOCK(inp);
2154                 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
2155                         return (EINVAL);
2156                 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
2157                 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
2158                     sopt->sopt_valsize);
2159                 if (error) {
2160                         free(pbuf, M_TEMP);
2161                         return (error);
2162                 }
2163                 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
2164                 if (CC_ALGO(tp)->ctl_output != NULL)
2165                         error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
2166                 else
2167                         error = ENOENT;
2168                 INP_WUNLOCK(inp);
2169                 if (error == 0 && sopt->sopt_dir == SOPT_GET)
2170                         error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
2171                 free(pbuf, M_TEMP);
2172                 return (error);
2173         }
2174
2175         switch (sopt->sopt_dir) {
2176         case SOPT_SET:
2177                 switch (sopt->sopt_name) {
2178 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2179                 case TCP_MD5SIG:
2180                         if (!TCPMD5_ENABLED()) {
2181                                 INP_WUNLOCK(inp);
2182                                 return (ENOPROTOOPT);
2183                         }
2184                         error = TCPMD5_PCBCTL(inp, sopt);
2185                         if (error)
2186                                 return (error);
2187                         goto unlock_and_done;
2188 #endif /* IPSEC */
2189
2190                 case TCP_NODELAY:
2191                 case TCP_NOOPT:
2192                 case TCP_LRD:
2193                         INP_WUNLOCK(inp);
2194                         error = sooptcopyin(sopt, &optval, sizeof optval,
2195                             sizeof optval);
2196                         if (error)
2197                                 return (error);
2198
2199                         INP_WLOCK_RECHECK(inp);
2200                         switch (sopt->sopt_name) {
2201                         case TCP_NODELAY:
2202                                 opt = TF_NODELAY;
2203                                 break;
2204                         case TCP_NOOPT:
2205                                 opt = TF_NOOPT;
2206                                 break;
2207                         case TCP_LRD:
2208                                 opt = TF_LRD;
2209                                 break;
2210                         default:
2211                                 opt = 0; /* dead code to fool gcc */
2212                                 break;
2213                         }
2214
2215                         if (optval)
2216                                 tp->t_flags |= opt;
2217                         else
2218                                 tp->t_flags &= ~opt;
2219 unlock_and_done:
2220 #ifdef TCP_OFFLOAD
2221                         if (tp->t_flags & TF_TOE) {
2222                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
2223                                     sopt->sopt_name);
2224                         }
2225 #endif
2226                         INP_WUNLOCK(inp);
2227                         break;
2228
2229                 case TCP_NOPUSH:
2230                         INP_WUNLOCK(inp);
2231                         error = sooptcopyin(sopt, &optval, sizeof optval,
2232                             sizeof optval);
2233                         if (error)
2234                                 return (error);
2235
2236                         INP_WLOCK_RECHECK(inp);
2237                         if (optval)
2238                                 tp->t_flags |= TF_NOPUSH;
2239                         else if (tp->t_flags & TF_NOPUSH) {
2240                                 tp->t_flags &= ~TF_NOPUSH;
2241                                 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2242                                         struct epoch_tracker et;
2243
2244                                         NET_EPOCH_ENTER(et);
2245                                         error = tcp_output_nodrop(tp);
2246                                         NET_EPOCH_EXIT(et);
2247                                 }
2248                         }
2249                         goto unlock_and_done;
2250
2251                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2252                         INP_WUNLOCK(inp);
2253                         error = sooptcopyin(sopt, &optval, sizeof optval,
2254                             sizeof optval);
2255                         if (error)
2256                                 return (error);
2257                         if ((optval < TCP_TUNNELING_PORT_MIN) ||
2258                             (optval > TCP_TUNNELING_PORT_MAX)) {
2259                                 /* Its got to be in range */
2260                                 return (EINVAL);
2261                         }
2262                         if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
2263                                 /* You have to have enabled a UDP tunneling port first */
2264                                 return (EINVAL);
2265                         }
2266                         INP_WLOCK_RECHECK(inp);
2267                         if (tp->t_state != TCPS_CLOSED) {
2268                                 /* You can't change after you are connected */
2269                                 error = EINVAL;
2270                         } else {
2271                                 /* Ok we are all good set the port */
2272                                 tp->t_port = htons(optval);
2273                         }
2274                         goto unlock_and_done;
2275
2276                 case TCP_MAXSEG:
2277                         INP_WUNLOCK(inp);
2278                         error = sooptcopyin(sopt, &optval, sizeof optval,
2279                             sizeof optval);
2280                         if (error)
2281                                 return (error);
2282
2283                         INP_WLOCK_RECHECK(inp);
2284                         if (optval > 0 && optval <= tp->t_maxseg &&
2285                             optval + 40 >= V_tcp_minmss)
2286                                 tp->t_maxseg = optval;
2287                         else
2288                                 error = EINVAL;
2289                         goto unlock_and_done;
2290
2291                 case TCP_INFO:
2292                         INP_WUNLOCK(inp);
2293                         error = EINVAL;
2294                         break;
2295
2296                 case TCP_STATS:
2297                         INP_WUNLOCK(inp);
2298 #ifdef STATS
2299                         error = sooptcopyin(sopt, &optval, sizeof optval,
2300                             sizeof optval);
2301                         if (error)
2302                                 return (error);
2303
2304                         if (optval > 0)
2305                                 sbp = stats_blob_alloc(
2306                                     V_tcp_perconn_stats_dflt_tpl, 0);
2307                         else
2308                                 sbp = NULL;
2309
2310                         INP_WLOCK_RECHECK(inp);
2311                         if ((tp->t_stats != NULL && sbp == NULL) ||
2312                             (tp->t_stats == NULL && sbp != NULL)) {
2313                                 struct statsblob *t = tp->t_stats;
2314                                 tp->t_stats = sbp;
2315                                 sbp = t;
2316                         }
2317                         INP_WUNLOCK(inp);
2318
2319                         stats_blob_destroy(sbp);
2320 #else
2321                         return (EOPNOTSUPP);
2322 #endif /* !STATS */
2323                         break;
2324
2325                 case TCP_CONGESTION:
2326                         error = tcp_congestion(so, sopt, inp, tp);
2327                         break;
2328
2329                 case TCP_REUSPORT_LB_NUMA:
2330                         INP_WUNLOCK(inp);
2331                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2332                             sizeof(optval));
2333                         INP_WLOCK_RECHECK(inp);
2334                         if (!error)
2335                                 error = in_pcblbgroup_numa(inp, optval);
2336                         INP_WUNLOCK(inp);
2337                         break;
2338
2339 #ifdef KERN_TLS
2340                 case TCP_TXTLS_ENABLE:
2341                         INP_WUNLOCK(inp);
2342                         error = copyin_tls_enable(sopt, &tls);
2343                         if (error)
2344                                 break;
2345                         error = ktls_enable_tx(so, &tls);
2346                         break;
2347                 case TCP_TXTLS_MODE:
2348                         INP_WUNLOCK(inp);
2349                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2350                         if (error)
2351                                 return (error);
2352
2353                         INP_WLOCK_RECHECK(inp);
2354                         error = ktls_set_tx_mode(so, ui);
2355                         INP_WUNLOCK(inp);
2356                         break;
2357                 case TCP_RXTLS_ENABLE:
2358                         INP_WUNLOCK(inp);
2359                         error = sooptcopyin(sopt, &tls, sizeof(tls),
2360                             sizeof(tls));
2361                         if (error)
2362                                 break;
2363                         error = ktls_enable_rx(so, &tls);
2364                         break;
2365 #endif
2366
2367                 case TCP_KEEPIDLE:
2368                 case TCP_KEEPINTVL:
2369                 case TCP_KEEPINIT:
2370                         INP_WUNLOCK(inp);
2371                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2372                         if (error)
2373                                 return (error);
2374
2375                         if (ui > (UINT_MAX / hz)) {
2376                                 error = EINVAL;
2377                                 break;
2378                         }
2379                         ui *= hz;
2380
2381                         INP_WLOCK_RECHECK(inp);
2382                         switch (sopt->sopt_name) {
2383                         case TCP_KEEPIDLE:
2384                                 tp->t_keepidle = ui;
2385                                 /*
2386                                  * XXX: better check current remaining
2387                                  * timeout and "merge" it with new value.
2388                                  */
2389                                 if ((tp->t_state > TCPS_LISTEN) &&
2390                                     (tp->t_state <= TCPS_CLOSING))
2391                                         tcp_timer_activate(tp, TT_KEEP,
2392                                             TP_KEEPIDLE(tp));
2393                                 break;
2394                         case TCP_KEEPINTVL:
2395                                 tp->t_keepintvl = ui;
2396                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2397                                     (TP_MAXIDLE(tp) > 0))
2398                                         tcp_timer_activate(tp, TT_2MSL,
2399                                             TP_MAXIDLE(tp));
2400                                 break;
2401                         case TCP_KEEPINIT:
2402                                 tp->t_keepinit = ui;
2403                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
2404                                     tp->t_state == TCPS_SYN_SENT)
2405                                         tcp_timer_activate(tp, TT_KEEP,
2406                                             TP_KEEPINIT(tp));
2407                                 break;
2408                         }
2409                         goto unlock_and_done;
2410
2411                 case TCP_KEEPCNT:
2412                         INP_WUNLOCK(inp);
2413                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2414                         if (error)
2415                                 return (error);
2416
2417                         INP_WLOCK_RECHECK(inp);
2418                         tp->t_keepcnt = ui;
2419                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2420                             (TP_MAXIDLE(tp) > 0))
2421                                 tcp_timer_activate(tp, TT_2MSL,
2422                                     TP_MAXIDLE(tp));
2423                         goto unlock_and_done;
2424
2425 #ifdef TCPPCAP
2426                 case TCP_PCAP_OUT:
2427                 case TCP_PCAP_IN:
2428                         INP_WUNLOCK(inp);
2429                         error = sooptcopyin(sopt, &optval, sizeof optval,
2430                             sizeof optval);
2431                         if (error)
2432                                 return (error);
2433
2434                         INP_WLOCK_RECHECK(inp);
2435                         if (optval >= 0)
2436                                 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2437                                         &(tp->t_outpkts) : &(tp->t_inpkts),
2438                                         optval);
2439                         else
2440                                 error = EINVAL;
2441                         goto unlock_and_done;
2442 #endif
2443
2444                 case TCP_FASTOPEN: {
2445                         struct tcp_fastopen tfo_optval;
2446
2447                         INP_WUNLOCK(inp);
2448                         if (!V_tcp_fastopen_client_enable &&
2449                             !V_tcp_fastopen_server_enable)
2450                                 return (EPERM);
2451
2452                         error = sooptcopyin(sopt, &tfo_optval,
2453                                     sizeof(tfo_optval), sizeof(int));
2454                         if (error)
2455                                 return (error);
2456
2457                         INP_WLOCK_RECHECK(inp);
2458                         if ((tp->t_state != TCPS_CLOSED) &&
2459                             (tp->t_state != TCPS_LISTEN)) {
2460                                 error = EINVAL;
2461                                 goto unlock_and_done;
2462                         }
2463                         if (tfo_optval.enable) {
2464                                 if (tp->t_state == TCPS_LISTEN) {
2465                                         if (!V_tcp_fastopen_server_enable) {
2466                                                 error = EPERM;
2467                                                 goto unlock_and_done;
2468                                         }
2469
2470                                         if (tp->t_tfo_pending == NULL)
2471                                                 tp->t_tfo_pending =
2472                                                     tcp_fastopen_alloc_counter();
2473                                 } else {
2474                                         /*
2475                                          * If a pre-shared key was provided,
2476                                          * stash it in the client cookie
2477                                          * field of the tcpcb for use during
2478                                          * connect.
2479                                          */
2480                                         if (sopt->sopt_valsize ==
2481                                             sizeof(tfo_optval)) {
2482                                                 memcpy(tp->t_tfo_cookie.client,
2483                                                        tfo_optval.psk,
2484                                                        TCP_FASTOPEN_PSK_LEN);
2485                                                 tp->t_tfo_client_cookie_len =
2486                                                     TCP_FASTOPEN_PSK_LEN;
2487                                         }
2488                                 }
2489                                 tp->t_flags |= TF_FASTOPEN;
2490                         } else
2491                                 tp->t_flags &= ~TF_FASTOPEN;
2492                         goto unlock_and_done;
2493                 }
2494
2495 #ifdef TCP_BLACKBOX
2496                 case TCP_LOG:
2497                         INP_WUNLOCK(inp);
2498                         error = sooptcopyin(sopt, &optval, sizeof optval,
2499                             sizeof optval);
2500                         if (error)
2501                                 return (error);
2502
2503                         INP_WLOCK_RECHECK(inp);
2504                         error = tcp_log_state_change(tp, optval);
2505                         goto unlock_and_done;
2506
2507                 case TCP_LOGBUF:
2508                         INP_WUNLOCK(inp);
2509                         error = EINVAL;
2510                         break;
2511
2512                 case TCP_LOGID:
2513                         INP_WUNLOCK(inp);
2514                         error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2515                         if (error)
2516                                 break;
2517                         buf[sopt->sopt_valsize] = '\0';
2518                         INP_WLOCK_RECHECK(inp);
2519                         error = tcp_log_set_id(tp, buf);
2520                         /* tcp_log_set_id() unlocks the INP. */
2521                         break;
2522
2523                 case TCP_LOGDUMP:
2524                 case TCP_LOGDUMPID:
2525                         INP_WUNLOCK(inp);
2526                         error =
2527                             sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2528                         if (error)
2529                                 break;
2530                         buf[sopt->sopt_valsize] = '\0';
2531                         INP_WLOCK_RECHECK(inp);
2532                         if (sopt->sopt_name == TCP_LOGDUMP) {
2533                                 error = tcp_log_dump_tp_logbuf(tp, buf,
2534                                     M_WAITOK, true);
2535                                 INP_WUNLOCK(inp);
2536                         } else {
2537                                 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2538                                 /*
2539                                  * tcp_log_dump_tp_bucket_logbufs() drops the
2540                                  * INP lock.
2541                                  */
2542                         }
2543                         break;
2544 #endif
2545
2546                 default:
2547                         INP_WUNLOCK(inp);
2548                         error = ENOPROTOOPT;
2549                         break;
2550                 }
2551                 break;
2552
2553         case SOPT_GET:
2554                 tp = intotcpcb(inp);
2555                 switch (sopt->sopt_name) {
2556 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2557                 case TCP_MD5SIG:
2558                         if (!TCPMD5_ENABLED()) {
2559                                 INP_WUNLOCK(inp);
2560                                 return (ENOPROTOOPT);
2561                         }
2562                         error = TCPMD5_PCBCTL(inp, sopt);
2563                         break;
2564 #endif
2565
2566                 case TCP_NODELAY:
2567                         optval = tp->t_flags & TF_NODELAY;
2568                         INP_WUNLOCK(inp);
2569                         error = sooptcopyout(sopt, &optval, sizeof optval);
2570                         break;
2571                 case TCP_MAXSEG:
2572                         optval = tp->t_maxseg;
2573                         INP_WUNLOCK(inp);
2574                         error = sooptcopyout(sopt, &optval, sizeof optval);
2575                         break;
2576                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2577                         optval = ntohs(tp->t_port);
2578                         INP_WUNLOCK(inp);
2579                         error = sooptcopyout(sopt, &optval, sizeof optval);
2580                         break;
2581                 case TCP_NOOPT:
2582                         optval = tp->t_flags & TF_NOOPT;
2583                         INP_WUNLOCK(inp);
2584                         error = sooptcopyout(sopt, &optval, sizeof optval);
2585                         break;
2586                 case TCP_NOPUSH:
2587                         optval = tp->t_flags & TF_NOPUSH;
2588                         INP_WUNLOCK(inp);
2589                         error = sooptcopyout(sopt, &optval, sizeof optval);
2590                         break;
2591                 case TCP_INFO:
2592                         tcp_fill_info(tp, &ti);
2593                         INP_WUNLOCK(inp);
2594                         error = sooptcopyout(sopt, &ti, sizeof ti);
2595                         break;
2596                 case TCP_STATS:
2597                         {
2598 #ifdef STATS
2599                         int nheld;
2600                         TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2601
2602                         error = 0;
2603                         socklen_t outsbsz = sopt->sopt_valsize;
2604                         if (tp->t_stats == NULL)
2605                                 error = ENOENT;
2606                         else if (outsbsz >= tp->t_stats->cursz)
2607                                 outsbsz = tp->t_stats->cursz;
2608                         else if (outsbsz >= sizeof(struct statsblob))
2609                                 outsbsz = sizeof(struct statsblob);
2610                         else
2611                                 error = EINVAL;
2612                         INP_WUNLOCK(inp);
2613                         if (error)
2614                                 break;
2615
2616                         sbp = sopt->sopt_val;
2617                         nheld = atop(round_page(((vm_offset_t)sbp) +
2618                             (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2619                         vm_page_t ma[nheld];
2620                         if (vm_fault_quick_hold_pages(
2621                             &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2622                             outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2623                             nheld) < 0) {
2624                                 error = EFAULT;
2625                                 break;
2626                         }
2627
2628                         if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2629                             SIZEOF_MEMBER(struct statsblob, flags))))
2630                                 goto unhold;
2631
2632                         INP_WLOCK_RECHECK(inp);
2633                         error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2634                             sbflags | SB_CLONE_USRDSTNOFAULT);
2635                         INP_WUNLOCK(inp);
2636                         sopt->sopt_valsize = outsbsz;
2637 unhold:
2638                         vm_page_unhold_pages(ma, nheld);
2639 #else
2640                         INP_WUNLOCK(inp);
2641                         error = EOPNOTSUPP;
2642 #endif /* !STATS */
2643                         break;
2644                         }
2645                 case TCP_CONGESTION:
2646                         len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2647                         INP_WUNLOCK(inp);
2648                         error = sooptcopyout(sopt, buf, len + 1);
2649                         break;
2650                 case TCP_KEEPIDLE:
2651                 case TCP_KEEPINTVL:
2652                 case TCP_KEEPINIT:
2653                 case TCP_KEEPCNT:
2654                         switch (sopt->sopt_name) {
2655                         case TCP_KEEPIDLE:
2656                                 ui = TP_KEEPIDLE(tp) / hz;
2657                                 break;
2658                         case TCP_KEEPINTVL:
2659                                 ui = TP_KEEPINTVL(tp) / hz;
2660                                 break;
2661                         case TCP_KEEPINIT:
2662                                 ui = TP_KEEPINIT(tp) / hz;
2663                                 break;
2664                         case TCP_KEEPCNT:
2665                                 ui = TP_KEEPCNT(tp);
2666                                 break;
2667                         }
2668                         INP_WUNLOCK(inp);
2669                         error = sooptcopyout(sopt, &ui, sizeof(ui));
2670                         break;
2671 #ifdef TCPPCAP
2672                 case TCP_PCAP_OUT:
2673                 case TCP_PCAP_IN:
2674                         optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2675                                         &(tp->t_outpkts) : &(tp->t_inpkts));
2676                         INP_WUNLOCK(inp);
2677                         error = sooptcopyout(sopt, &optval, sizeof optval);
2678                         break;
2679 #endif
2680                 case TCP_FASTOPEN:
2681                         optval = tp->t_flags & TF_FASTOPEN;
2682                         INP_WUNLOCK(inp);
2683                         error = sooptcopyout(sopt, &optval, sizeof optval);
2684                         break;
2685 #ifdef TCP_BLACKBOX
2686                 case TCP_LOG:
2687                         optval = tp->t_logstate;
2688                         INP_WUNLOCK(inp);
2689                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2690                         break;
2691                 case TCP_LOGBUF:
2692                         /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2693                         error = tcp_log_getlogbuf(sopt, tp);
2694                         break;
2695                 case TCP_LOGID:
2696                         len = tcp_log_get_id(tp, buf);
2697                         INP_WUNLOCK(inp);
2698                         error = sooptcopyout(sopt, buf, len + 1);
2699                         break;
2700                 case TCP_LOGDUMP:
2701                 case TCP_LOGDUMPID:
2702                         INP_WUNLOCK(inp);
2703                         error = EINVAL;
2704                         break;
2705 #endif
2706 #ifdef KERN_TLS
2707                 case TCP_TXTLS_MODE:
2708                         error = ktls_get_tx_mode(so, &optval);
2709                         INP_WUNLOCK(inp);
2710                         if (error == 0)
2711                                 error = sooptcopyout(sopt, &optval,
2712                                     sizeof(optval));
2713                         break;
2714                 case TCP_RXTLS_MODE:
2715                         error = ktls_get_rx_mode(so, &optval);
2716                         INP_WUNLOCK(inp);
2717                         if (error == 0)
2718                                 error = sooptcopyout(sopt, &optval,
2719                                     sizeof(optval));
2720                         break;
2721 #endif
2722                 case TCP_LRD:
2723                         optval = tp->t_flags & TF_LRD;
2724                         INP_WUNLOCK(inp);
2725                         error = sooptcopyout(sopt, &optval, sizeof optval);
2726                         break;
2727                 default:
2728                         INP_WUNLOCK(inp);
2729                         error = ENOPROTOOPT;
2730                         break;
2731                 }
2732                 break;
2733         }
2734         return (error);
2735 }
2736 #undef INP_WLOCK_RECHECK
2737 #undef INP_WLOCK_RECHECK_CLEANUP
2738
2739 /*
2740  * Initiate (or continue) disconnect.
2741  * If embryonic state, just send reset (once).
2742  * If in ``let data drain'' option and linger null, just drop.
2743  * Otherwise (hard), mark socket disconnecting and drop
2744  * current input data; switch states based on user close, and
2745  * send segment to peer (with FIN).
2746  */
2747 static void
2748 tcp_disconnect(struct tcpcb *tp)
2749 {
2750         struct inpcb *inp = tp->t_inpcb;
2751         struct socket *so = inp->inp_socket;
2752
2753         NET_EPOCH_ASSERT();
2754         INP_WLOCK_ASSERT(inp);
2755
2756         /*
2757          * Neither tcp_close() nor tcp_drop() should return NULL, as the
2758          * socket is still open.
2759          */
2760         if (tp->t_state < TCPS_ESTABLISHED &&
2761             !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2762                 tp = tcp_close(tp);
2763                 KASSERT(tp != NULL,
2764                     ("tcp_disconnect: tcp_close() returned NULL"));
2765         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2766                 tp = tcp_drop(tp, 0);
2767                 KASSERT(tp != NULL,
2768                     ("tcp_disconnect: tcp_drop() returned NULL"));
2769         } else {
2770                 soisdisconnecting(so);
2771                 sbflush(&so->so_rcv);
2772                 tcp_usrclosed(tp);
2773                 if (!(inp->inp_flags & INP_DROPPED))
2774                         /* Ignore stack's drop request, we already at it. */
2775                         (void)tcp_output_nodrop(tp);
2776         }
2777 }
2778
2779 /*
2780  * User issued close, and wish to trail through shutdown states:
2781  * if never received SYN, just forget it.  If got a SYN from peer,
2782  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2783  * If already got a FIN from peer, then almost done; go to LAST_ACK
2784  * state.  In all other cases, have already sent FIN to peer (e.g.
2785  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2786  * for peer to send FIN or not respond to keep-alives, etc.
2787  * We can let the user exit from the close as soon as the FIN is acked.
2788  */
2789 static void
2790 tcp_usrclosed(struct tcpcb *tp)
2791 {
2792
2793         NET_EPOCH_ASSERT();
2794         INP_WLOCK_ASSERT(tp->t_inpcb);
2795
2796         switch (tp->t_state) {
2797         case TCPS_LISTEN:
2798 #ifdef TCP_OFFLOAD
2799                 tcp_offload_listen_stop(tp);
2800 #endif
2801                 tcp_state_change(tp, TCPS_CLOSED);
2802                 /* FALLTHROUGH */
2803         case TCPS_CLOSED:
2804                 tp = tcp_close(tp);
2805                 /*
2806                  * tcp_close() should never return NULL here as the socket is
2807                  * still open.
2808                  */
2809                 KASSERT(tp != NULL,
2810                     ("tcp_usrclosed: tcp_close() returned NULL"));
2811                 break;
2812
2813         case TCPS_SYN_SENT:
2814         case TCPS_SYN_RECEIVED:
2815                 tp->t_flags |= TF_NEEDFIN;
2816                 break;
2817
2818         case TCPS_ESTABLISHED:
2819                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2820                 break;
2821
2822         case TCPS_CLOSE_WAIT:
2823                 tcp_state_change(tp, TCPS_LAST_ACK);
2824                 break;
2825         }
2826         if (tp->t_state >= TCPS_FIN_WAIT_2) {
2827                 soisdisconnected(tp->t_inpcb->inp_socket);
2828                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2829                 if (tp->t_state == TCPS_FIN_WAIT_2) {
2830                         int timeout;
2831
2832                         timeout = (tcp_fast_finwait2_recycle) ?
2833                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
2834                         tcp_timer_activate(tp, TT_2MSL, timeout);
2835                 }
2836         }
2837 }
2838
2839 #ifdef DDB
2840 static void
2841 db_print_indent(int indent)
2842 {
2843         int i;
2844
2845         for (i = 0; i < indent; i++)
2846                 db_printf(" ");
2847 }
2848
2849 static void
2850 db_print_tstate(int t_state)
2851 {
2852
2853         switch (t_state) {
2854         case TCPS_CLOSED:
2855                 db_printf("TCPS_CLOSED");
2856                 return;
2857
2858         case TCPS_LISTEN:
2859                 db_printf("TCPS_LISTEN");
2860                 return;
2861
2862         case TCPS_SYN_SENT:
2863                 db_printf("TCPS_SYN_SENT");
2864                 return;
2865
2866         case TCPS_SYN_RECEIVED:
2867                 db_printf("TCPS_SYN_RECEIVED");
2868                 return;
2869
2870         case TCPS_ESTABLISHED:
2871                 db_printf("TCPS_ESTABLISHED");
2872                 return;
2873
2874         case TCPS_CLOSE_WAIT:
2875                 db_printf("TCPS_CLOSE_WAIT");
2876                 return;
2877
2878         case TCPS_FIN_WAIT_1:
2879                 db_printf("TCPS_FIN_WAIT_1");
2880                 return;
2881
2882         case TCPS_CLOSING:
2883                 db_printf("TCPS_CLOSING");
2884                 return;
2885
2886         case TCPS_LAST_ACK:
2887                 db_printf("TCPS_LAST_ACK");
2888                 return;
2889
2890         case TCPS_FIN_WAIT_2:
2891                 db_printf("TCPS_FIN_WAIT_2");
2892                 return;
2893
2894         case TCPS_TIME_WAIT:
2895                 db_printf("TCPS_TIME_WAIT");
2896                 return;
2897
2898         default:
2899                 db_printf("unknown");
2900                 return;
2901         }
2902 }
2903
2904 static void
2905 db_print_tflags(u_int t_flags)
2906 {
2907         int comma;
2908
2909         comma = 0;
2910         if (t_flags & TF_ACKNOW) {
2911                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2912                 comma = 1;
2913         }
2914         if (t_flags & TF_DELACK) {
2915                 db_printf("%sTF_DELACK", comma ? ", " : "");
2916                 comma = 1;
2917         }
2918         if (t_flags & TF_NODELAY) {
2919                 db_printf("%sTF_NODELAY", comma ? ", " : "");
2920                 comma = 1;
2921         }
2922         if (t_flags & TF_NOOPT) {
2923                 db_printf("%sTF_NOOPT", comma ? ", " : "");
2924                 comma = 1;
2925         }
2926         if (t_flags & TF_SENTFIN) {
2927                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2928                 comma = 1;
2929         }
2930         if (t_flags & TF_REQ_SCALE) {
2931                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2932                 comma = 1;
2933         }
2934         if (t_flags & TF_RCVD_SCALE) {
2935                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2936                 comma = 1;
2937         }
2938         if (t_flags & TF_REQ_TSTMP) {
2939                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2940                 comma = 1;
2941         }
2942         if (t_flags & TF_RCVD_TSTMP) {
2943                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2944                 comma = 1;
2945         }
2946         if (t_flags & TF_SACK_PERMIT) {
2947                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2948                 comma = 1;
2949         }
2950         if (t_flags & TF_NEEDSYN) {
2951                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2952                 comma = 1;
2953         }
2954         if (t_flags & TF_NEEDFIN) {
2955                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2956                 comma = 1;
2957         }
2958         if (t_flags & TF_NOPUSH) {
2959                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2960                 comma = 1;
2961         }
2962         if (t_flags & TF_MORETOCOME) {
2963                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2964                 comma = 1;
2965         }
2966         if (t_flags & TF_LQ_OVERFLOW) {
2967                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2968                 comma = 1;
2969         }
2970         if (t_flags & TF_LASTIDLE) {
2971                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2972                 comma = 1;
2973         }
2974         if (t_flags & TF_RXWIN0SENT) {
2975                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2976                 comma = 1;
2977         }
2978         if (t_flags & TF_FASTRECOVERY) {
2979                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2980                 comma = 1;
2981         }
2982         if (t_flags & TF_CONGRECOVERY) {
2983                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2984                 comma = 1;
2985         }
2986         if (t_flags & TF_WASFRECOVERY) {
2987                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2988                 comma = 1;
2989         }
2990         if (t_flags & TF_SIGNATURE) {
2991                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2992                 comma = 1;
2993         }
2994         if (t_flags & TF_FORCEDATA) {
2995                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2996                 comma = 1;
2997         }
2998         if (t_flags & TF_TSO) {
2999                 db_printf("%sTF_TSO", comma ? ", " : "");
3000                 comma = 1;
3001         }
3002         if (t_flags & TF_FASTOPEN) {
3003                 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
3004                 comma = 1;
3005         }
3006 }
3007
3008 static void
3009 db_print_tflags2(u_int t_flags2)
3010 {
3011         int comma;
3012
3013         comma = 0;
3014         if (t_flags2 & TF2_ECN_PERMIT) {
3015                 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
3016                 comma = 1;
3017         }
3018 }
3019
3020 static void
3021 db_print_toobflags(char t_oobflags)
3022 {
3023         int comma;
3024
3025         comma = 0;
3026         if (t_oobflags & TCPOOB_HAVEDATA) {
3027                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
3028                 comma = 1;
3029         }
3030         if (t_oobflags & TCPOOB_HADDATA) {
3031                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
3032                 comma = 1;
3033         }
3034 }
3035
3036 static void
3037 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
3038 {
3039
3040         db_print_indent(indent);
3041         db_printf("%s at %p\n", name, tp);
3042
3043         indent += 2;
3044
3045         db_print_indent(indent);
3046         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
3047            TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
3048
3049         db_print_indent(indent);
3050         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
3051             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
3052
3053         db_print_indent(indent);
3054         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
3055             &tp->t_timers->tt_delack, tp->t_inpcb);
3056
3057         db_print_indent(indent);
3058         db_printf("t_state: %d (", tp->t_state);
3059         db_print_tstate(tp->t_state);
3060         db_printf(")\n");
3061
3062         db_print_indent(indent);
3063         db_printf("t_flags: 0x%x (", tp->t_flags);
3064         db_print_tflags(tp->t_flags);
3065         db_printf(")\n");
3066
3067         db_print_indent(indent);
3068         db_printf("t_flags2: 0x%x (", tp->t_flags2);
3069         db_print_tflags2(tp->t_flags2);
3070         db_printf(")\n");
3071
3072         db_print_indent(indent);
3073         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
3074             tp->snd_una, tp->snd_max, tp->snd_nxt);
3075
3076         db_print_indent(indent);
3077         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
3078            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
3079
3080         db_print_indent(indent);
3081         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
3082             tp->iss, tp->irs, tp->rcv_nxt);
3083
3084         db_print_indent(indent);
3085         db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
3086             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
3087
3088         db_print_indent(indent);
3089         db_printf("snd_wnd: %u   snd_cwnd: %u\n",
3090            tp->snd_wnd, tp->snd_cwnd);
3091
3092         db_print_indent(indent);
3093         db_printf("snd_ssthresh: %u   snd_recover: "
3094             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
3095
3096         db_print_indent(indent);
3097         db_printf("t_rcvtime: %u   t_startime: %u\n",
3098             tp->t_rcvtime, tp->t_starttime);
3099
3100         db_print_indent(indent);
3101         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
3102             tp->t_rtttime, tp->t_rtseq);
3103
3104         db_print_indent(indent);
3105         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
3106             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
3107
3108         db_print_indent(indent);
3109         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
3110             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
3111             tp->t_rttbest);
3112
3113         db_print_indent(indent);
3114         db_printf("t_rttupdated: %lu   max_sndwnd: %u   t_softerror: %d\n",
3115             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
3116
3117         db_print_indent(indent);
3118         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
3119         db_print_toobflags(tp->t_oobflags);
3120         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
3121
3122         db_print_indent(indent);
3123         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
3124             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
3125
3126         db_print_indent(indent);
3127         db_printf("ts_recent: %u   ts_recent_age: %u\n",
3128             tp->ts_recent, tp->ts_recent_age);
3129
3130         db_print_indent(indent);
3131         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
3132             "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
3133
3134         db_print_indent(indent);
3135         db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
3136             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
3137             tp->snd_recover_prev, tp->t_badrxtwin);
3138
3139         db_print_indent(indent);
3140         db_printf("snd_numholes: %d  snd_holes first: %p\n",
3141             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
3142
3143         db_print_indent(indent);
3144         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d\n",
3145             tp->snd_fack, tp->rcv_numsacks);
3146
3147         /* Skip sackblks, sackhint. */
3148
3149         db_print_indent(indent);
3150         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
3151             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
3152 }
3153
3154 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
3155 {
3156         struct tcpcb *tp;
3157
3158         if (!have_addr) {
3159                 db_printf("usage: show tcpcb <addr>\n");
3160                 return;
3161         }
3162         tp = (struct tcpcb *)addr;
3163
3164         db_print_tcpcb(tp, "tcpcb", 0);
3165 }
3166 #endif