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