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.h>
  86 #include <netinet/ip_var.h>
  87 #ifdef INET6
  88 #include <netinet/ip6.h>
  89 #include <netinet6/in6_pcb.h>
  90 #include <netinet6/ip6_var.h>
  91 #include <netinet6/scope6_var.h>
  92 #endif
  93 #include <netinet/tcp.h>
  94 #include <netinet/tcp_fsm.h>
  95 #include <netinet/tcp_seq.h>
  96 #include <netinet/tcp_timer.h>
  97 #include <netinet/tcp_var.h>
  98 #include <netinet/tcp_log_buf.h>
  99 #include <netinet/tcpip.h>
 100 #include <netinet/cc/cc.h>
 101 #include <netinet/tcp_fastopen.h>
 102 #include <netinet/tcp_hpts.h>
 103 #ifdef TCPPCAP
 104 #include <netinet/tcp_pcap.h>
 105 #endif
 106 #ifdef TCPDEBUG
 107 #include <netinet/tcp_debug.h>
 108 #endif
 109 #ifdef TCP_OFFLOAD
 110 #include <netinet/tcp_offload.h>
 111 #endif
 112 #include <netipsec/ipsec_support.h>
 113
 114 #include <vm/vm.h>
 115 #include <vm/vm_param.h>
 116 #include <vm/pmap.h>
 117 #include <vm/vm_extern.h>
 118 #include <vm/vm_map.h>
 119 #include <vm/vm_page.h>
 120
 121 /*
 122  * TCP protocol interface to socket abstraction.
 123  */
 124 #ifdef INET
 125 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
 126                     struct thread *td);
 127 #endif /* INET */
 128 #ifdef INET6
 129 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
 130                     struct thread *td);
 131 #endif /* INET6 */
 132 static void     tcp_disconnect(struct tcpcb *);
 133 static void     tcp_usrclosed(struct tcpcb *);
 134 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 135
 136 static int      tcp_pru_options_support(struct tcpcb *tp, int flags);
 137
 138 #ifdef TCPDEBUG
 139 #define TCPDEBUG0       int ostate = 0
 140 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 141 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 142                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 143 #else
 144 #define TCPDEBUG0
 145 #define TCPDEBUG1()
 146 #define TCPDEBUG2(req)
 147 #endif
 148
 149 /*
 150  * tcp_require_unique port requires a globally-unique source port for each
 151  * outgoing connection.  The default is to require the 4-tuple to be unique.
 152  */
 153 VNET_DEFINE(int, tcp_require_unique_port) = 0;
 154 SYSCTL_INT(_net_inet_tcp, OID_AUTO, require_unique_port,
 155     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_require_unique_port), 0,
 156     "Require globally-unique ephemeral port for outgoing connections");
 157 #define V_tcp_require_unique_port       VNET(tcp_require_unique_port)
 158
 159 /*
 160  * TCP attaches to socket via pru_attach(), reserving space,
 161  * and an internet control block.
 162  */
 163 static int
 164 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 165 {
 166         struct inpcb *inp;
 167         struct tcpcb *tp = NULL;
 168         int error;
 169         TCPDEBUG0;
 170
 171         inp = sotoinpcb(so);
 172         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 173         TCPDEBUG1();
 174
 175         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 176                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
 177                 if (error)
 178                         goto out;
 179         }
 180
 181         so->so_rcv.sb_flags |= SB_AUTOSIZE;
 182         so->so_snd.sb_flags |= SB_AUTOSIZE;
 183         error = in_pcballoc(so, &V_tcbinfo);
 184         if (error)
 185                 goto out;
 186         inp = sotoinpcb(so);
 187 #ifdef INET6
 188         if (inp->inp_vflag & INP_IPV6PROTO) {
 189                 inp->inp_vflag |= INP_IPV6;
 190                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 191                         inp->inp_vflag |= INP_IPV4;
 192                 inp->in6p_hops = -1;    /* use kernel default */
 193         }
 194         else
 195 #endif
 196                 inp->inp_vflag |= INP_IPV4;
 197         tp = tcp_newtcpcb(inp);
 198         if (tp == NULL) {
 199                 error = ENOBUFS;
 200                 in_pcbdetach(inp);
 201                 in_pcbfree(inp);
 202                 goto out;
 203         }
 204         tp->t_state = TCPS_CLOSED;
 205         INP_WUNLOCK(inp);
 206         TCPSTATES_INC(TCPS_CLOSED);
 207 out:
 208         TCPDEBUG2(PRU_ATTACH);
 209         TCP_PROBE2(debug__user, tp, PRU_ATTACH);
 210         return (error);
 211 }
 212
 213 /*
 214  * tcp_usr_detach is called when the socket layer loses its final reference
 215  * to the socket, be it a file descriptor reference, a reference from TCP,
 216  * etc.  At this point, there is only one case in which we will keep around
 217  * inpcb state: time wait.
 218  */
 219 static void
 220 tcp_usr_detach(struct socket *so)
 221 {
 222         struct inpcb *inp;
 223         struct tcpcb *tp;
 224
 225         inp = sotoinpcb(so);
 226         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 227         INP_WLOCK(inp);
 228         KASSERT(so->so_pcb == inp && inp->inp_socket == so,
 229                 ("%s: socket %p inp %p mismatch", __func__, so, inp));
 230
 231         tp = intotcpcb(inp);
 232
 233         if (inp->inp_flags & INP_TIMEWAIT) {
 234                 /*
 235                  * There are two cases to handle: one in which the time wait
 236                  * state is being discarded (INP_DROPPED), and one in which
 237                  * this connection will remain in timewait.  In the former,
 238                  * it is time to discard all state (except tcptw, which has
 239                  * already been discarded by the timewait close code, which
 240                  * should be further up the call stack somewhere).  In the
 241                  * latter case, we detach from the socket, but leave the pcb
 242                  * present until timewait ends.
 243                  *
 244                  * XXXRW: Would it be cleaner to free the tcptw here?
 245                  *
 246                  * Astute question indeed, from twtcp perspective there are
 247                  * four cases to consider:
 248                  *
 249                  * #1 tcp_usr_detach is called at tcptw creation time by
 250                  *  tcp_twstart, then do not discard the newly created tcptw
 251                  *  and leave inpcb present until timewait ends
 252                  * #2 tcp_usr_detach is called at tcptw creation time by
 253                  *  tcp_twstart, but connection is local and tw will be
 254                  *  discarded immediately
 255                  * #3 tcp_usr_detach is called at timewait end (or reuse) by
 256                  *  tcp_twclose, then the tcptw has already been discarded
 257                  *  (or reused) and inpcb is freed here
 258                  * #4 tcp_usr_detach is called() after timewait ends (or reuse)
 259                  *  (e.g. by soclose), then tcptw has already been discarded
 260                  *  (or reused) and inpcb is freed here
 261                  *
 262                  *  In all three cases the tcptw should not be freed here.
 263                  */
 264                 if (inp->inp_flags & INP_DROPPED) {
 265                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 266                             "INP_DROPPED && tp != NULL"));
 267                         in_pcbdetach(inp);
 268                         in_pcbfree(inp);
 269                 } else {
 270                         in_pcbdetach(inp);
 271                         INP_WUNLOCK(inp);
 272                 }
 273         } else {
 274                 /*
 275                  * If the connection is not in timewait, it must be either
 276                  * dropped or embryonic.
 277                  */
 278                 KASSERT(inp->inp_flags & INP_DROPPED ||
 279                     tp->t_state < TCPS_SYN_SENT,
 280                     ("%s: inp %p not dropped or embryonic", __func__, inp));
 281                 tcp_discardcb(tp);
 282                 in_pcbdetach(inp);
 283                 in_pcbfree(inp);
 284         }
 285 }
 286
 287 #ifdef INET
 288 /*
 289  * Give the socket an address.
 290  */
 291 static int
 292 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 293 {
 294         int error = 0;
 295         struct inpcb *inp;
 296 #ifdef KDTRACE_HOOKS
 297         struct tcpcb *tp = NULL;
 298 #endif
 299         struct sockaddr_in *sinp;
 300
 301         sinp = (struct sockaddr_in *)nam;
 302         if (nam->sa_family != AF_INET) {
 303                 /*
 304                  * Preserve compatibility with old programs.
 305                  */
 306                 if (nam->sa_family != AF_UNSPEC ||
 307                     nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
 308                     sinp->sin_addr.s_addr != INADDR_ANY)
 309                         return (EAFNOSUPPORT);
 310                 nam->sa_family = AF_INET;
 311         }
 312         if (nam->sa_len != sizeof(*sinp))
 313                 return (EINVAL);
 314
 315         /*
 316          * Must check for multicast addresses and disallow binding
 317          * to them.
 318          */
 319         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 320                 return (EAFNOSUPPORT);
 321
 322         TCPDEBUG0;
 323         inp = sotoinpcb(so);
 324         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 325         INP_WLOCK(inp);
 326         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 327                 error = EINVAL;
 328                 goto out;
 329         }
 330 #ifdef KDTRACE_HOOKS
 331         tp = intotcpcb(inp);
 332 #endif
 333         TCPDEBUG1();
 334         INP_HASH_WLOCK(&V_tcbinfo);
 335         error = in_pcbbind(inp, nam, td->td_ucred);
 336         INP_HASH_WUNLOCK(&V_tcbinfo);
 337 out:
 338         TCPDEBUG2(PRU_BIND);
 339         TCP_PROBE2(debug__user, tp, PRU_BIND);
 340         INP_WUNLOCK(inp);
 341
 342         return (error);
 343 }
 344 #endif /* INET */
 345
 346 #ifdef INET6
 347 static int
 348 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 349 {
 350         int error = 0;
 351         struct inpcb *inp;
 352 #ifdef KDTRACE_HOOKS
 353         struct tcpcb *tp = NULL;
 354 #endif
 355         struct sockaddr_in6 *sin6;
 356         u_char vflagsav;
 357
 358         sin6 = (struct sockaddr_in6 *)nam;
 359         if (nam->sa_family != AF_INET6)
 360                 return (EAFNOSUPPORT);
 361         if (nam->sa_len != sizeof(*sin6))
 362                 return (EINVAL);
 363
 364         /*
 365          * Must check for multicast addresses and disallow binding
 366          * to them.
 367          */
 368         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 369                 return (EAFNOSUPPORT);
 370
 371         TCPDEBUG0;
 372         inp = sotoinpcb(so);
 373         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 374         INP_WLOCK(inp);
 375         vflagsav = inp->inp_vflag;
 376         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 377                 error = EINVAL;
 378                 goto out;
 379         }
 380 #ifdef KDTRACE_HOOKS
 381         tp = intotcpcb(inp);
 382 #endif
 383         TCPDEBUG1();
 384         INP_HASH_WLOCK(&V_tcbinfo);
 385         inp->inp_vflag &= ~INP_IPV4;
 386         inp->inp_vflag |= INP_IPV6;
 387 #ifdef INET
 388         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 389                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 390                         inp->inp_vflag |= INP_IPV4;
 391                 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 392                         struct sockaddr_in sin;
 393
 394                         in6_sin6_2_sin(&sin, sin6);
 395                         if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 396                                 error = EAFNOSUPPORT;
 397                                 INP_HASH_WUNLOCK(&V_tcbinfo);
 398                                 goto out;
 399                         }
 400                         inp->inp_vflag |= INP_IPV4;
 401                         inp->inp_vflag &= ~INP_IPV6;
 402                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 403                             td->td_ucred);
 404                         INP_HASH_WUNLOCK(&V_tcbinfo);
 405                         goto out;
 406                 }
 407         }
 408 #endif
 409         error = in6_pcbbind(inp, nam, td->td_ucred);
 410         INP_HASH_WUNLOCK(&V_tcbinfo);
 411 out:
 412         if (error != 0)
 413                 inp->inp_vflag = vflagsav;
 414         TCPDEBUG2(PRU_BIND);
 415         TCP_PROBE2(debug__user, tp, PRU_BIND);
 416         INP_WUNLOCK(inp);
 417         return (error);
 418 }
 419 #endif /* INET6 */
 420
 421 #ifdef INET
 422 /*
 423  * Prepare to accept connections.
 424  */
 425 static int
 426 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 427 {
 428         int error = 0;
 429         struct inpcb *inp;
 430         struct tcpcb *tp = NULL;
 431
 432         TCPDEBUG0;
 433         inp = sotoinpcb(so);
 434         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 435         INP_WLOCK(inp);
 436         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 437                 error = EINVAL;
 438                 goto out;
 439         }
 440         tp = intotcpcb(inp);
 441         TCPDEBUG1();
 442         SOCK_LOCK(so);
 443         error = solisten_proto_check(so);
 444         if (error != 0) {
 445                 SOCK_UNLOCK(so);
 446                 goto out;
 447         }
 448         if (inp->inp_lport == 0) {
 449                 INP_HASH_WLOCK(&V_tcbinfo);
 450                 error = in_pcbbind(inp, NULL, td->td_ucred);
 451                 INP_HASH_WUNLOCK(&V_tcbinfo);
 452         }
 453         if (error == 0) {
 454                 tcp_state_change(tp, TCPS_LISTEN);
 455                 solisten_proto(so, backlog);
 456 #ifdef TCP_OFFLOAD
 457                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 458                         tcp_offload_listen_start(tp);
 459 #endif
 460         } else {
 461                 solisten_proto_abort(so);
 462         }
 463         SOCK_UNLOCK(so);
 464
 465         if (IS_FASTOPEN(tp->t_flags))
 466                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 467
 468 out:
 469         TCPDEBUG2(PRU_LISTEN);
 470         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 471         INP_WUNLOCK(inp);
 472         return (error);
 473 }
 474 #endif /* INET */
 475
 476 #ifdef INET6
 477 static int
 478 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 479 {
 480         int error = 0;
 481         struct inpcb *inp;
 482         struct tcpcb *tp = NULL;
 483         u_char vflagsav;
 484
 485         TCPDEBUG0;
 486         inp = sotoinpcb(so);
 487         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 488         INP_WLOCK(inp);
 489         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 490                 error = EINVAL;
 491                 goto out;
 492         }
 493         vflagsav = inp->inp_vflag;
 494         tp = intotcpcb(inp);
 495         TCPDEBUG1();
 496         SOCK_LOCK(so);
 497         error = solisten_proto_check(so);
 498         if (error != 0) {
 499                 SOCK_UNLOCK(so);
 500                 goto out;
 501         }
 502         INP_HASH_WLOCK(&V_tcbinfo);
 503         if (inp->inp_lport == 0) {
 504                 inp->inp_vflag &= ~INP_IPV4;
 505                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 506                         inp->inp_vflag |= INP_IPV4;
 507                 error = in6_pcbbind(inp, NULL, td->td_ucred);
 508         }
 509         INP_HASH_WUNLOCK(&V_tcbinfo);
 510         if (error == 0) {
 511                 tcp_state_change(tp, TCPS_LISTEN);
 512                 solisten_proto(so, backlog);
 513 #ifdef TCP_OFFLOAD
 514                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 515                         tcp_offload_listen_start(tp);
 516 #endif
 517         } else {
 518                 solisten_proto_abort(so);
 519         }
 520         SOCK_UNLOCK(so);
 521
 522         if (IS_FASTOPEN(tp->t_flags))
 523                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 524
 525         if (error != 0)
 526                 inp->inp_vflag = vflagsav;
 527
 528 out:
 529         TCPDEBUG2(PRU_LISTEN);
 530         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 531         INP_WUNLOCK(inp);
 532         return (error);
 533 }
 534 #endif /* INET6 */
 535
 536 #ifdef INET
 537 /*
 538  * Initiate connection to peer.
 539  * Create a template for use in transmissions on this connection.
 540  * Enter SYN_SENT state, and mark socket as connecting.
 541  * Start keep-alive timer, and seed output sequence space.
 542  * Send initial segment on connection.
 543  */
 544 static int
 545 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 546 {
 547         struct epoch_tracker et;
 548         int error = 0;
 549         struct inpcb *inp;
 550         struct tcpcb *tp = NULL;
 551         struct sockaddr_in *sinp;
 552
 553         sinp = (struct sockaddr_in *)nam;
 554         if (nam->sa_family != AF_INET)
 555                 return (EAFNOSUPPORT);
 556         if (nam->sa_len != sizeof (*sinp))
 557                 return (EINVAL);
 558
 559         /*
 560          * Must disallow TCP ``connections'' to multicast addresses.
 561          */
 562         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 563                 return (EAFNOSUPPORT);
 564         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST)
 565                 return (EACCES);
 566         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 567                 return (error);
 568
 569         TCPDEBUG0;
 570         inp = sotoinpcb(so);
 571         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 572         INP_WLOCK(inp);
 573         if (inp->inp_flags & INP_TIMEWAIT) {
 574                 error = EADDRINUSE;
 575                 goto out;
 576         }
 577         if (inp->inp_flags & INP_DROPPED) {
 578                 error = ECONNREFUSED;
 579                 goto out;
 580         }
 581         if (SOLISTENING(so)) {
 582                 error = EOPNOTSUPP;
 583                 goto out;
 584         }
 585         tp = intotcpcb(inp);
 586         TCPDEBUG1();
 587         NET_EPOCH_ENTER(et);
 588         if ((error = tcp_connect(tp, nam, td)) != 0)
 589                 goto out_in_epoch;
 590 #ifdef TCP_OFFLOAD
 591         if (registered_toedevs > 0 &&
 592             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 593             (error = tcp_offload_connect(so, nam)) == 0)
 594                 goto out_in_epoch;
 595 #endif
 596         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 597         error = tcp_output(tp);
 598         KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
 599             ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
 600 out_in_epoch:
 601         NET_EPOCH_EXIT(et);
 602 out:
 603         TCPDEBUG2(PRU_CONNECT);
 604         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 605         INP_WUNLOCK(inp);
 606         return (error);
 607 }
 608 #endif /* INET */
 609
 610 #ifdef INET6
 611 static int
 612 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 613 {
 614         struct epoch_tracker et;
 615         int error = 0;
 616         struct inpcb *inp;
 617         struct tcpcb *tp = NULL;
 618         struct sockaddr_in6 *sin6;
 619         u_int8_t incflagsav;
 620         u_char vflagsav;
 621
 622         TCPDEBUG0;
 623
 624         sin6 = (struct sockaddr_in6 *)nam;
 625         if (nam->sa_family != AF_INET6)
 626                 return (EAFNOSUPPORT);
 627         if (nam->sa_len != sizeof (*sin6))
 628                 return (EINVAL);
 629
 630         /*
 631          * Must disallow TCP ``connections'' to multicast addresses.
 632          */
 633         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 634                 return (EAFNOSUPPORT);
 635
 636         inp = sotoinpcb(so);
 637         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 638         INP_WLOCK(inp);
 639         vflagsav = inp->inp_vflag;
 640         incflagsav = inp->inp_inc.inc_flags;
 641         if (inp->inp_flags & INP_TIMEWAIT) {
 642                 error = EADDRINUSE;
 643                 goto out;
 644         }
 645         if (inp->inp_flags & INP_DROPPED) {
 646                 error = ECONNREFUSED;
 647                 goto out;
 648         }
 649         if (SOLISTENING(so)) {
 650                 error = EINVAL;
 651                 goto out;
 652         }
 653         tp = intotcpcb(inp);
 654         TCPDEBUG1();
 655 #ifdef INET
 656         /*
 657          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 658          * therefore probably require the hash lock, which isn't held here.
 659          * Is this a significant problem?
 660          */
 661         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 662                 struct sockaddr_in sin;
 663
 664                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 665                         error = EINVAL;
 666                         goto out;
 667                 }
 668                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 669                         error = EAFNOSUPPORT;
 670                         goto out;
 671                 }
 672
 673                 in6_sin6_2_sin(&sin, sin6);
 674                 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 675                         error = EAFNOSUPPORT;
 676                         goto out;
 677                 }
 678                 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) {
 679                         error = EACCES;
 680                         goto out;
 681                 }
 682                 if ((error = prison_remote_ip4(td->td_ucred,
 683                     &sin.sin_addr)) != 0)
 684                         goto out;
 685                 inp->inp_vflag |= INP_IPV4;
 686                 inp->inp_vflag &= ~INP_IPV6;
 687                 NET_EPOCH_ENTER(et);
 688                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 689                         goto out_in_epoch;
 690 #ifdef TCP_OFFLOAD
 691                 if (registered_toedevs > 0 &&
 692                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 693                     (error = tcp_offload_connect(so, nam)) == 0)
 694                         goto out_in_epoch;
 695 #endif
 696                 error = tcp_output(tp);
 697                 goto out_in_epoch;
 698         } else {
 699                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 700                         error = EAFNOSUPPORT;
 701                         goto out;
 702                 }
 703         }
 704 #endif
 705         if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
 706                 goto out;
 707         inp->inp_vflag &= ~INP_IPV4;
 708         inp->inp_vflag |= INP_IPV6;
 709         inp->inp_inc.inc_flags |= INC_ISIPV6;
 710         if ((error = tcp6_connect(tp, nam, td)) != 0)
 711                 goto out;
 712 #ifdef TCP_OFFLOAD
 713         if (registered_toedevs > 0 &&
 714             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 715             (error = tcp_offload_connect(so, nam)) == 0)
 716                 goto out;
 717 #endif
 718         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 719         NET_EPOCH_ENTER(et);
 720         error = tcp_output(tp);
 721 #ifdef INET
 722 out_in_epoch:
 723 #endif
 724         NET_EPOCH_EXIT(et);
 725 out:
 726         KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
 727             ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
 728         /*
 729          * If the implicit bind in the connect call fails, restore
 730          * the flags we modified.
 731          */
 732         if (error != 0 && inp->inp_lport == 0) {
 733                 inp->inp_vflag = vflagsav;
 734                 inp->inp_inc.inc_flags = incflagsav;
 735         }
 736
 737         TCPDEBUG2(PRU_CONNECT);
 738         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 739         INP_WUNLOCK(inp);
 740         return (error);
 741 }
 742 #endif /* INET6 */
 743
 744 /*
 745  * Initiate disconnect from peer.
 746  * If connection never passed embryonic stage, just drop;
 747  * else if don't need to let data drain, then can just drop anyways,
 748  * else have to begin TCP shutdown process: mark socket disconnecting,
 749  * drain unread data, state switch to reflect user close, and
 750  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 751  * when peer sends FIN and acks ours.
 752  *
 753  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 754  */
 755 static int
 756 tcp_usr_disconnect(struct socket *so)
 757 {
 758         struct inpcb *inp;
 759         struct tcpcb *tp = NULL;
 760         struct epoch_tracker et;
 761         int error = 0;
 762
 763         TCPDEBUG0;
 764         NET_EPOCH_ENTER(et);
 765         inp = sotoinpcb(so);
 766         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 767         INP_WLOCK(inp);
 768         if (inp->inp_flags & INP_TIMEWAIT)
 769                 goto out;
 770         if (inp->inp_flags & INP_DROPPED) {
 771                 error = ECONNRESET;
 772                 goto out;
 773         }
 774         tp = intotcpcb(inp);
 775         TCPDEBUG1();
 776         tcp_disconnect(tp);
 777 out:
 778         TCPDEBUG2(PRU_DISCONNECT);
 779         TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
 780         INP_WUNLOCK(inp);
 781         NET_EPOCH_EXIT(et);
 782         return (error);
 783 }
 784
 785 #ifdef INET
 786 /*
 787  * Accept a connection.  Essentially all the work is done at higher levels;
 788  * just return the address of the peer, storing through addr.
 789  */
 790 static int
 791 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 792 {
 793         int error = 0;
 794         struct inpcb *inp = NULL;
 795 #ifdef KDTRACE_HOOKS
 796         struct tcpcb *tp = NULL;
 797 #endif
 798         struct in_addr addr;
 799         in_port_t port = 0;
 800         TCPDEBUG0;
 801
 802         if (so->so_state & SS_ISDISCONNECTED)
 803                 return (ECONNABORTED);
 804
 805         inp = sotoinpcb(so);
 806         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 807         INP_WLOCK(inp);
 808         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 809                 error = ECONNABORTED;
 810                 goto out;
 811         }
 812 #ifdef KDTRACE_HOOKS
 813         tp = intotcpcb(inp);
 814 #endif
 815         TCPDEBUG1();
 816
 817         /*
 818          * We inline in_getpeeraddr and COMMON_END here, so that we can
 819          * copy the data of interest and defer the malloc until after we
 820          * release the lock.
 821          */
 822         port = inp->inp_fport;
 823         addr = inp->inp_faddr;
 824
 825 out:
 826         TCPDEBUG2(PRU_ACCEPT);
 827         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 828         INP_WUNLOCK(inp);
 829         if (error == 0)
 830                 *nam = in_sockaddr(port, &addr);
 831         return error;
 832 }
 833 #endif /* INET */
 834
 835 #ifdef INET6
 836 static int
 837 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 838 {
 839         struct inpcb *inp = NULL;
 840         int error = 0;
 841 #ifdef KDTRACE_HOOKS
 842         struct tcpcb *tp = NULL;
 843 #endif
 844         struct in_addr addr;
 845         struct in6_addr addr6;
 846         struct epoch_tracker et;
 847         in_port_t port = 0;
 848         int v4 = 0;
 849         TCPDEBUG0;
 850
 851         if (so->so_state & SS_ISDISCONNECTED)
 852                 return (ECONNABORTED);
 853
 854         inp = sotoinpcb(so);
 855         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 856         NET_EPOCH_ENTER(et);
 857         INP_WLOCK(inp);
 858         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 859                 error = ECONNABORTED;
 860                 goto out;
 861         }
 862 #ifdef KDTRACE_HOOKS
 863         tp = intotcpcb(inp);
 864 #endif
 865         TCPDEBUG1();
 866
 867         /*
 868          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 869          * copy the data of interest and defer the malloc until after we
 870          * release the lock.
 871          */
 872         if (inp->inp_vflag & INP_IPV4) {
 873                 v4 = 1;
 874                 port = inp->inp_fport;
 875                 addr = inp->inp_faddr;
 876         } else {
 877                 port = inp->inp_fport;
 878                 addr6 = inp->in6p_faddr;
 879         }
 880
 881 out:
 882         TCPDEBUG2(PRU_ACCEPT);
 883         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 884         INP_WUNLOCK(inp);
 885         NET_EPOCH_EXIT(et);
 886         if (error == 0) {
 887                 if (v4)
 888                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 889                 else
 890                         *nam = in6_sockaddr(port, &addr6);
 891         }
 892         return error;
 893 }
 894 #endif /* INET6 */
 895
 896 /*
 897  * Mark the connection as being incapable of further output.
 898  */
 899 static int
 900 tcp_usr_shutdown(struct socket *so)
 901 {
 902         int error = 0;
 903         struct inpcb *inp;
 904         struct tcpcb *tp = NULL;
 905         struct epoch_tracker et;
 906
 907         TCPDEBUG0;
 908         inp = sotoinpcb(so);
 909         KASSERT(inp != NULL, ("inp == NULL"));
 910         INP_WLOCK(inp);
 911         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 912                 INP_WUNLOCK(inp);
 913                 return (ECONNRESET);
 914         }
 915         tp = intotcpcb(inp);
 916         NET_EPOCH_ENTER(et);
 917         TCPDEBUG1();
 918         socantsendmore(so);
 919         tcp_usrclosed(tp);
 920         if (!(inp->inp_flags & INP_DROPPED))
 921                 error = tcp_output_nodrop(tp);
 922         TCPDEBUG2(PRU_SHUTDOWN);
 923         TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
 924         error = tcp_unlock_or_drop(tp, error);
 925         NET_EPOCH_EXIT(et);
 926
 927         return (error);
 928 }
 929
 930 /*
 931  * After a receive, possibly send window update to peer.
 932  */
 933 static int
 934 tcp_usr_rcvd(struct socket *so, int flags)
 935 {
 936         struct epoch_tracker et;
 937         struct inpcb *inp;
 938         struct tcpcb *tp = NULL;
 939         int outrv = 0, error = 0;
 940
 941         TCPDEBUG0;
 942         inp = sotoinpcb(so);
 943         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 944         INP_WLOCK(inp);
 945         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 946                 INP_WUNLOCK(inp);
 947                 return (ECONNRESET);
 948         }
 949         tp = intotcpcb(inp);
 950         NET_EPOCH_ENTER(et);
 951         TCPDEBUG1();
 952         /*
 953          * For passively-created TFO connections, don't attempt a window
 954          * update while still in SYN_RECEIVED as this may trigger an early
 955          * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
 956          * application response data, or failing that, when the DELACK timer
 957          * expires.
 958          */
 959         if (IS_FASTOPEN(tp->t_flags) &&
 960             (tp->t_state == TCPS_SYN_RECEIVED))
 961                 goto out;
 962 #ifdef TCP_OFFLOAD
 963         if (tp->t_flags & TF_TOE)
 964                 tcp_offload_rcvd(tp);
 965         else
 966 #endif
 967                 outrv = tcp_output_nodrop(tp);
 968 out:
 969         TCPDEBUG2(PRU_RCVD);
 970         TCP_PROBE2(debug__user, tp, PRU_RCVD);
 971         (void) tcp_unlock_or_drop(tp, outrv);
 972         NET_EPOCH_EXIT(et);
 973         return (error);
 974 }
 975
 976 /*
 977  * Do a send by putting data in output queue and updating urgent
 978  * marker if URG set.  Possibly send more data.  Unlike the other
 979  * pru_*() routines, the mbuf chains are our responsibility.  We
 980  * must either enqueue them or free them.  The other pru_* routines
 981  * generally are caller-frees.
 982  */
 983 static int
 984 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 985     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 986 {
 987         struct epoch_tracker et;
 988         int error = 0;
 989         struct inpcb *inp;
 990         struct tcpcb *tp = NULL;
 991 #ifdef INET
 992 #ifdef INET6
 993         struct sockaddr_in sin;
 994 #endif
 995         struct sockaddr_in *sinp;
 996 #endif
 997 #ifdef INET6
 998         int isipv6;
 999 #endif
1000         u_int8_t incflagsav;
1001         u_char vflagsav;
1002         bool restoreflags;
1003         TCPDEBUG0;
1004
1005         if (control != NULL) {
1006                 /* TCP doesn't do control messages (rights, creds, etc) */
1007                 if (control->m_len) {
1008                         m_freem(control);
1009                         return (EINVAL);
1010                 }
1011                 m_freem(control);       /* empty control, just free it */
1012         }
1013
1014         inp = sotoinpcb(so);
1015         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
1016         INP_WLOCK(inp);
1017         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1018                 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1019                         m_freem(m);
1020                 INP_WUNLOCK(inp);
1021                 return (ECONNRESET);
1022         }
1023
1024         vflagsav = inp->inp_vflag;
1025         incflagsav = inp->inp_inc.inc_flags;
1026         restoreflags = false;
1027         tp = intotcpcb(inp);
1028
1029         NET_EPOCH_ENTER(et);
1030         if ((flags & PRUS_OOB) != 0 &&
1031             (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
1032                 goto out;
1033
1034         TCPDEBUG1();
1035         if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
1036                 if (tp->t_state == TCPS_LISTEN) {
1037                         error = EINVAL;
1038                         goto out;
1039                 }
1040                 switch (nam->sa_family) {
1041 #ifdef INET
1042                 case AF_INET:
1043                         sinp = (struct sockaddr_in *)nam;
1044                         if (sinp->sin_len != sizeof(struct sockaddr_in)) {
1045                                 error = EINVAL;
1046                                 goto out;
1047                         }
1048                         if ((inp->inp_vflag & INP_IPV6) != 0) {
1049                                 error = EAFNOSUPPORT;
1050                                 goto out;
1051                         }
1052                         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
1053                                 error = EAFNOSUPPORT;
1054                                 goto out;
1055                         }
1056                         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
1057                                 error = EACCES;
1058                                 goto out;
1059                         }
1060                         if ((error = prison_remote_ip4(td->td_ucred,
1061                             &sinp->sin_addr)))
1062                                 goto out;
1063 #ifdef INET6
1064                         isipv6 = 0;
1065 #endif
1066                         break;
1067 #endif /* INET */
1068 #ifdef INET6
1069                 case AF_INET6:
1070                 {
1071                         struct sockaddr_in6 *sin6;
1072
1073                         sin6 = (struct sockaddr_in6 *)nam;
1074                         if (sin6->sin6_len != sizeof(*sin6)) {
1075                                 error = EINVAL;
1076                                 goto out;
1077                         }
1078                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1079                                 error = EAFNOSUPPORT;
1080                                 goto out;
1081                         }
1082                         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1083                                 error = EAFNOSUPPORT;
1084                                 goto out;
1085                         }
1086                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1087 #ifdef INET
1088                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1089                                         error = EINVAL;
1090                                         goto out;
1091                                 }
1092                                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1093                                         error = EAFNOSUPPORT;
1094                                         goto out;
1095                                 }
1096                                 restoreflags = true;
1097                                 inp->inp_vflag &= ~INP_IPV6;
1098                                 sinp = &sin;
1099                                 in6_sin6_2_sin(sinp, sin6);
1100                                 if (IN_MULTICAST(
1101                                     ntohl(sinp->sin_addr.s_addr))) {
1102                                         error = EAFNOSUPPORT;
1103                                         goto out;
1104                                 }
1105                                 if ((error = prison_remote_ip4(td->td_ucred,
1106                                     &sinp->sin_addr)))
1107                                         goto out;
1108                                 isipv6 = 0;
1109 #else /* !INET */
1110                                 error = EAFNOSUPPORT;
1111                                 goto out;
1112 #endif /* INET */
1113                         } else {
1114                                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1115                                         error = EAFNOSUPPORT;
1116                                         goto out;
1117                                 }
1118                                 restoreflags = true;
1119                                 inp->inp_vflag &= ~INP_IPV4;
1120                                 inp->inp_inc.inc_flags |= INC_ISIPV6;
1121                                 if ((error = prison_remote_ip6(td->td_ucred,
1122                                     &sin6->sin6_addr)))
1123                                         goto out;
1124                                 isipv6 = 1;
1125                         }
1126                         break;
1127                 }
1128 #endif /* INET6 */
1129                 default:
1130                         error = EAFNOSUPPORT;
1131                         goto out;
1132                 }
1133         }
1134         if (!(flags & PRUS_OOB)) {
1135                 sbappendstream(&so->so_snd, m, flags);
1136                 m = NULL;
1137                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1138                         KASSERT(tp->t_state == TCPS_CLOSED,
1139                             ("%s: tp %p is listening", __func__, tp));
1140
1141                         /*
1142                          * Do implied connect if not yet connected,
1143                          * initialize window to default value, and
1144                          * initialize maxseg using peer's cached MSS.
1145                          */
1146 #ifdef INET6
1147                         if (isipv6)
1148                                 error = tcp6_connect(tp, nam, td);
1149 #endif /* INET6 */
1150 #if defined(INET6) && defined(INET)
1151                         else
1152 #endif
1153 #ifdef INET
1154                                 error = tcp_connect(tp,
1155                                     (struct sockaddr *)sinp, td);
1156 #endif
1157                         /*
1158                          * The bind operation in tcp_connect succeeded. We
1159                          * no longer want to restore the flags if later
1160                          * operations fail.
1161                          */
1162                         if (error == 0 || inp->inp_lport != 0)
1163                                 restoreflags = false;
1164
1165                         if (error) {
1166                                 /* m is freed if PRUS_NOTREADY is unset. */
1167                                 sbflush(&so->so_snd);
1168                                 goto out;
1169                         }
1170                         if (IS_FASTOPEN(tp->t_flags))
1171                                 tcp_fastopen_connect(tp);
1172                         else {
1173                                 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1174                                 tcp_mss(tp, -1);
1175                         }
1176                 }
1177                 if (flags & PRUS_EOF) {
1178                         /*
1179                          * Close the send side of the connection after
1180                          * the data is sent.
1181                          */
1182                         socantsendmore(so);
1183                         tcp_usrclosed(tp);
1184                 }
1185                 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
1186                     ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
1187                     (tp->t_fbyte_out == 0) &&
1188                     (so->so_snd.sb_ccc > 0)) {
1189                         tp->t_fbyte_out = ticks;
1190                         if (tp->t_fbyte_out == 0)
1191                                 tp->t_fbyte_out = 1;
1192                         if (tp->t_fbyte_out && tp->t_fbyte_in)
1193                                 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
1194                 }
1195                 if (!(inp->inp_flags & INP_DROPPED) &&
1196                     !(flags & PRUS_NOTREADY)) {
1197                         if (flags & PRUS_MORETOCOME)
1198                                 tp->t_flags |= TF_MORETOCOME;
1199                         error = tcp_output_nodrop(tp);
1200                         if (flags & PRUS_MORETOCOME)
1201                                 tp->t_flags &= ~TF_MORETOCOME;
1202                 }
1203         } else {
1204                 /*
1205                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1206                  */
1207                 SOCKBUF_LOCK(&so->so_snd);
1208                 if (sbspace(&so->so_snd) < -512) {
1209                         SOCKBUF_UNLOCK(&so->so_snd);
1210                         error = ENOBUFS;
1211                         goto out;
1212                 }
1213                 /*
1214                  * According to RFC961 (Assigned Protocols),
1215                  * the urgent pointer points to the last octet
1216                  * of urgent data.  We continue, however,
1217                  * to consider it to indicate the first octet
1218                  * of data past the urgent section.
1219                  * Otherwise, snd_up should be one lower.
1220                  */
1221                 sbappendstream_locked(&so->so_snd, m, flags);
1222                 SOCKBUF_UNLOCK(&so->so_snd);
1223                 m = NULL;
1224                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1225                         /*
1226                          * Do implied connect if not yet connected,
1227                          * initialize window to default value, and
1228                          * initialize maxseg using peer's cached MSS.
1229                          */
1230
1231                         /*
1232                          * Not going to contemplate SYN|URG
1233                          */
1234                         if (IS_FASTOPEN(tp->t_flags))
1235                                 tp->t_flags &= ~TF_FASTOPEN;
1236 #ifdef INET6
1237                         if (isipv6)
1238                                 error = tcp6_connect(tp, nam, td);
1239 #endif /* INET6 */
1240 #if defined(INET6) && defined(INET)
1241                         else
1242 #endif
1243 #ifdef INET
1244                                 error = tcp_connect(tp,
1245                                     (struct sockaddr *)sinp, td);
1246 #endif
1247                         /*
1248                          * The bind operation in tcp_connect succeeded. We
1249                          * no longer want to restore the flags if later
1250                          * operations fail.
1251                          */
1252                         if (error == 0 || inp->inp_lport != 0)
1253                                 restoreflags = false;
1254
1255                         if (error != 0) {
1256                                 /* m is freed if PRUS_NOTREADY is unset. */
1257                                 sbflush(&so->so_snd);
1258                                 goto out;
1259                         }
1260                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
1261                         tcp_mss(tp, -1);
1262                 }
1263                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1264                 if ((flags & PRUS_NOTREADY) == 0) {
1265                         tp->t_flags |= TF_FORCEDATA;
1266                         error = tcp_output_nodrop(tp);
1267                         tp->t_flags &= ~TF_FORCEDATA;
1268                 }
1269         }
1270         TCP_LOG_EVENT(tp, NULL,
1271             &inp->inp_socket->so_rcv,
1272             &inp->inp_socket->so_snd,
1273             TCP_LOG_USERSEND, error,
1274             0, NULL, false);
1275
1276 out:
1277         /*
1278          * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
1279          * responsible for freeing memory.
1280          */
1281         if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1282                 m_freem(m);
1283
1284         /*
1285          * If the request was unsuccessful and we changed flags,
1286          * restore the original flags.
1287          */
1288         if (error != 0 && restoreflags) {
1289                 inp->inp_vflag = vflagsav;
1290                 inp->inp_inc.inc_flags = incflagsav;
1291         }
1292         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1293                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1294         TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1295                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1296         error = tcp_unlock_or_drop(tp, error);
1297         NET_EPOCH_EXIT(et);
1298         return (error);
1299 }
1300
1301 static int
1302 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1303 {
1304         struct epoch_tracker et;
1305         struct inpcb *inp;
1306         struct tcpcb *tp;
1307         int error;
1308
1309         inp = sotoinpcb(so);
1310         INP_WLOCK(inp);
1311         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1312                 INP_WUNLOCK(inp);
1313                 mb_free_notready(m, count);
1314                 return (ECONNRESET);
1315         }
1316         tp = intotcpcb(inp);
1317
1318         SOCKBUF_LOCK(&so->so_snd);
1319         error = sbready(&so->so_snd, m, count);
1320         SOCKBUF_UNLOCK(&so->so_snd);
1321         if (error) {
1322                 INP_WUNLOCK(inp);
1323                 return (error);
1324         }
1325         NET_EPOCH_ENTER(et);
1326         error = tcp_output_unlock(tp);
1327         NET_EPOCH_EXIT(et);
1328
1329         return (error);
1330 }
1331
1332 /*
1333  * Abort the TCP.  Drop the connection abruptly.
1334  */
1335 static void
1336 tcp_usr_abort(struct socket *so)
1337 {
1338         struct inpcb *inp;
1339         struct tcpcb *tp = NULL;
1340         struct epoch_tracker et;
1341         TCPDEBUG0;
1342
1343         inp = sotoinpcb(so);
1344         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1345
1346         NET_EPOCH_ENTER(et);
1347         INP_WLOCK(inp);
1348         KASSERT(inp->inp_socket != NULL,
1349             ("tcp_usr_abort: inp_socket == NULL"));
1350
1351         /*
1352          * If we still have full TCP state, and we're not dropped, drop.
1353          */
1354         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1355             !(inp->inp_flags & INP_DROPPED)) {
1356                 tp = intotcpcb(inp);
1357                 TCPDEBUG1();
1358                 tp = tcp_drop(tp, ECONNABORTED);
1359                 if (tp == NULL)
1360                         goto dropped;
1361                 TCPDEBUG2(PRU_ABORT);
1362                 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1363         }
1364         if (!(inp->inp_flags & INP_DROPPED)) {
1365                 soref(so);
1366                 inp->inp_flags |= INP_SOCKREF;
1367         }
1368         INP_WUNLOCK(inp);
1369 dropped:
1370         NET_EPOCH_EXIT(et);
1371 }
1372
1373 /*
1374  * TCP socket is closed.  Start friendly disconnect.
1375  */
1376 static void
1377 tcp_usr_close(struct socket *so)
1378 {
1379         struct inpcb *inp;
1380         struct tcpcb *tp = NULL;
1381         struct epoch_tracker et;
1382         TCPDEBUG0;
1383
1384         inp = sotoinpcb(so);
1385         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1386
1387         NET_EPOCH_ENTER(et);
1388         INP_WLOCK(inp);
1389         KASSERT(inp->inp_socket != NULL,
1390             ("tcp_usr_close: inp_socket == NULL"));
1391
1392         /*
1393          * If we still have full TCP state, and we're not dropped, initiate
1394          * a disconnect.
1395          */
1396         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1397             !(inp->inp_flags & INP_DROPPED)) {
1398                 tp = intotcpcb(inp);
1399                 tp->t_flags |= TF_CLOSED;
1400                 TCPDEBUG1();
1401                 tcp_disconnect(tp);
1402                 TCPDEBUG2(PRU_CLOSE);
1403                 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1404         }
1405         if (!(inp->inp_flags & INP_DROPPED)) {
1406                 soref(so);
1407                 inp->inp_flags |= INP_SOCKREF;
1408         }
1409         INP_WUNLOCK(inp);
1410         NET_EPOCH_EXIT(et);
1411 }
1412
1413 static int
1414 tcp_pru_options_support(struct tcpcb *tp, int flags)
1415 {
1416         /*
1417          * If the specific TCP stack has a pru_options
1418          * specified then it does not always support
1419          * all the PRU_XX options and we must ask it.
1420          * If the function is not specified then all
1421          * of the PRU_XX options are supported.
1422          */
1423         int ret = 0;
1424
1425         if (tp->t_fb->tfb_pru_options) {
1426                 ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1427         }
1428         return (ret);
1429 }
1430
1431 /*
1432  * Receive out-of-band data.
1433  */
1434 static int
1435 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1436 {
1437         int error = 0;
1438         struct inpcb *inp;
1439         struct tcpcb *tp = NULL;
1440
1441         TCPDEBUG0;
1442         inp = sotoinpcb(so);
1443         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1444         INP_WLOCK(inp);
1445         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1446                 error = ECONNRESET;
1447                 goto out;
1448         }
1449         tp = intotcpcb(inp);
1450         error = tcp_pru_options_support(tp, PRUS_OOB);
1451         if (error) {
1452                 goto out;
1453         }
1454         TCPDEBUG1();
1455         if ((so->so_oobmark == 0 &&
1456              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1457             so->so_options & SO_OOBINLINE ||
1458             tp->t_oobflags & TCPOOB_HADDATA) {
1459                 error = EINVAL;
1460                 goto out;
1461         }
1462         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1463                 error = EWOULDBLOCK;
1464                 goto out;
1465         }
1466         m->m_len = 1;
1467         *mtod(m, caddr_t) = tp->t_iobc;
1468         if ((flags & MSG_PEEK) == 0)
1469                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1470
1471 out:
1472         TCPDEBUG2(PRU_RCVOOB);
1473         TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1474         INP_WUNLOCK(inp);
1475         return (error);
1476 }
1477
1478 #ifdef INET
1479 struct pr_usrreqs tcp_usrreqs = {
1480         .pru_abort =            tcp_usr_abort,
1481         .pru_accept =           tcp_usr_accept,
1482         .pru_attach =           tcp_usr_attach,
1483         .pru_bind =             tcp_usr_bind,
1484         .pru_connect =          tcp_usr_connect,
1485         .pru_control =          in_control,
1486         .pru_detach =           tcp_usr_detach,
1487         .pru_disconnect =       tcp_usr_disconnect,
1488         .pru_listen =           tcp_usr_listen,
1489         .pru_peeraddr =         in_getpeeraddr,
1490         .pru_rcvd =             tcp_usr_rcvd,
1491         .pru_rcvoob =           tcp_usr_rcvoob,
1492         .pru_send =             tcp_usr_send,
1493         .pru_ready =            tcp_usr_ready,
1494         .pru_shutdown =         tcp_usr_shutdown,
1495         .pru_sockaddr =         in_getsockaddr,
1496         .pru_sosetlabel =       in_pcbsosetlabel,
1497         .pru_close =            tcp_usr_close,
1498 };
1499 #endif /* INET */
1500
1501 #ifdef INET6
1502 struct pr_usrreqs tcp6_usrreqs = {
1503         .pru_abort =            tcp_usr_abort,
1504         .pru_accept =           tcp6_usr_accept,
1505         .pru_attach =           tcp_usr_attach,
1506         .pru_bind =             tcp6_usr_bind,
1507         .pru_connect =          tcp6_usr_connect,
1508         .pru_control =          in6_control,
1509         .pru_detach =           tcp_usr_detach,
1510         .pru_disconnect =       tcp_usr_disconnect,
1511         .pru_listen =           tcp6_usr_listen,
1512         .pru_peeraddr =         in6_mapped_peeraddr,
1513         .pru_rcvd =             tcp_usr_rcvd,
1514         .pru_rcvoob =           tcp_usr_rcvoob,
1515         .pru_send =             tcp_usr_send,
1516         .pru_ready =            tcp_usr_ready,
1517         .pru_shutdown =         tcp_usr_shutdown,
1518         .pru_sockaddr =         in6_mapped_sockaddr,
1519         .pru_sosetlabel =       in_pcbsosetlabel,
1520         .pru_close =            tcp_usr_close,
1521 };
1522 #endif /* INET6 */
1523
1524 #ifdef INET
1525 /*
1526  * Common subroutine to open a TCP connection to remote host specified
1527  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1528  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1529  * to choose a local host address (interface).  If there is an existing
1530  * incarnation of the same connection in TIME-WAIT state and if the remote
1531  * host was sending CC options and if the connection duration was < MSL, then
1532  * truncate the previous TIME-WAIT state and proceed.
1533  * Initialize connection parameters and enter SYN-SENT state.
1534  */
1535 static int
1536 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1537 {
1538         struct inpcb *inp = tp->t_inpcb, *oinp;
1539         struct socket *so = inp->inp_socket;
1540         struct in_addr laddr;
1541         u_short lport;
1542         int error;
1543
1544         NET_EPOCH_ASSERT();
1545         INP_WLOCK_ASSERT(inp);
1546         INP_HASH_WLOCK(&V_tcbinfo);
1547
1548         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1549                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1550                 if (error)
1551                         goto out;
1552         }
1553
1554         /*
1555          * Cannot simply call in_pcbconnect, because there might be an
1556          * earlier incarnation of this same connection still in
1557          * TIME_WAIT state, creating an ADDRINUSE error.
1558          */
1559         laddr = inp->inp_laddr;
1560         lport = inp->inp_lport;
1561         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1562             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1563         if (error && oinp == NULL)
1564                 goto out;
1565         if (oinp) {
1566                 error = EADDRINUSE;
1567                 goto out;
1568         }
1569         /* Handle initial bind if it hadn't been done in advance. */
1570         if (inp->inp_lport == 0) {
1571                 inp->inp_lport = lport;
1572                 if (in_pcbinshash(inp) != 0) {
1573                         inp->inp_lport = 0;
1574                         error = EAGAIN;
1575                         goto out;
1576                 }
1577         }
1578         inp->inp_laddr = laddr;
1579         in_pcbrehash(inp);
1580         INP_HASH_WUNLOCK(&V_tcbinfo);
1581
1582         /*
1583          * Compute window scaling to request:
1584          * Scale to fit into sweet spot.  See tcp_syncache.c.
1585          * XXX: This should move to tcp_output().
1586          */
1587         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1588             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1589                 tp->request_r_scale++;
1590
1591         soisconnecting(so);
1592         TCPSTAT_INC(tcps_connattempt);
1593         tcp_state_change(tp, TCPS_SYN_SENT);
1594         tp->iss = tcp_new_isn(&inp->inp_inc);
1595         if (tp->t_flags & TF_REQ_TSTMP)
1596                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1597         tcp_sendseqinit(tp);
1598
1599         return 0;
1600
1601 out:
1602         INP_HASH_WUNLOCK(&V_tcbinfo);
1603         return (error);
1604 }
1605 #endif /* INET */
1606
1607 #ifdef INET6
1608 static int
1609 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1610 {
1611         struct inpcb *inp = tp->t_inpcb;
1612         int error;
1613
1614         INP_WLOCK_ASSERT(inp);
1615         INP_HASH_WLOCK(&V_tcbinfo);
1616
1617         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1618                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1619                 if (error)
1620                         goto out;
1621         }
1622         error = in6_pcbconnect(inp, nam, td->td_ucred);
1623         if (error != 0)
1624                 goto out;
1625         INP_HASH_WUNLOCK(&V_tcbinfo);
1626
1627         /* Compute window scaling to request.  */
1628         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1629             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1630                 tp->request_r_scale++;
1631
1632         soisconnecting(inp->inp_socket);
1633         TCPSTAT_INC(tcps_connattempt);
1634         tcp_state_change(tp, TCPS_SYN_SENT);
1635         tp->iss = tcp_new_isn(&inp->inp_inc);
1636         if (tp->t_flags & TF_REQ_TSTMP)
1637                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1638         tcp_sendseqinit(tp);
1639
1640         return 0;
1641
1642 out:
1643         INP_HASH_WUNLOCK(&V_tcbinfo);
1644         return error;
1645 }
1646 #endif /* INET6 */
1647
1648 /*
1649  * Export TCP internal state information via a struct tcp_info, based on the
1650  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1651  * (TCP state machine, etc).  We export all information using FreeBSD-native
1652  * constants -- for example, the numeric values for tcpi_state will differ
1653  * from Linux.
1654  */
1655 static void
1656 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1657 {
1658
1659         INP_WLOCK_ASSERT(tp->t_inpcb);
1660         bzero(ti, sizeof(*ti));
1661
1662         ti->tcpi_state = tp->t_state;
1663         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1664                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1665         if (tp->t_flags & TF_SACK_PERMIT)
1666                 ti->tcpi_options |= TCPI_OPT_SACK;
1667         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1668                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1669                 ti->tcpi_snd_wscale = tp->snd_scale;
1670                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1671         }
1672         if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
1673                 ti->tcpi_options |= TCPI_OPT_ECN;
1674
1675         ti->tcpi_rto = tp->t_rxtcur * tick;
1676         ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1677         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1678         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1679
1680         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1681         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1682
1683         /*
1684          * FreeBSD-specific extension fields for tcp_info.
1685          */
1686         ti->tcpi_rcv_space = tp->rcv_wnd;
1687         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1688         ti->tcpi_snd_wnd = tp->snd_wnd;
1689         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1690         ti->tcpi_snd_nxt = tp->snd_nxt;
1691         ti->tcpi_snd_mss = tp->t_maxseg;
1692         ti->tcpi_rcv_mss = tp->t_maxseg;
1693         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1694         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1695         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1696 #ifdef TCP_OFFLOAD
1697         if (tp->t_flags & TF_TOE) {
1698                 ti->tcpi_options |= TCPI_OPT_TOE;
1699                 tcp_offload_tcp_info(tp, ti);
1700         }
1701 #endif
1702 }
1703
1704 /*
1705  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1706  * socket option arguments.  When it re-acquires the lock after the copy, it
1707  * has to revalidate that the connection is still valid for the socket
1708  * option.
1709  */
1710 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do {                    \
1711         INP_WLOCK(inp);                                                 \
1712         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1713                 INP_WUNLOCK(inp);                                       \
1714                 cleanup;                                                \
1715                 return (ECONNRESET);                                    \
1716         }                                                               \
1717         tp = intotcpcb(inp);                                            \
1718 } while(0)
1719 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1720
1721 int
1722 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt)
1723 {
1724         struct socket *so = inp->inp_socket;
1725         struct tcpcb *tp = intotcpcb(inp);
1726         int error = 0;
1727
1728         MPASS(sopt->sopt_dir == SOPT_SET);
1729         INP_WLOCK_ASSERT(inp);
1730         KASSERT((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0,
1731             ("inp_flags == %x", inp->inp_flags));
1732         KASSERT(so != NULL, ("inp_socket == NULL"));
1733
1734         if (sopt->sopt_level != IPPROTO_TCP) {
1735                 INP_WUNLOCK(inp);
1736 #ifdef INET6
1737                 if (inp->inp_vflag & INP_IPV6PROTO)
1738                         error = ip6_ctloutput(so, sopt);
1739 #endif
1740 #if defined(INET6) && defined(INET)
1741                 else
1742 #endif
1743 #ifdef INET
1744                         error = ip_ctloutput(so, sopt);
1745 #endif
1746                 /*
1747                  * When an IP-level socket option affects TCP, pass control
1748                  * down to stack tfb_tcp_ctloutput, otherwise return what
1749                  * IP level returned.
1750                  */
1751                 switch (sopt->sopt_level) {
1752 #ifdef INET6
1753                 case IPPROTO_IPV6:
1754                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
1755                                 return (error);
1756                         switch (sopt->sopt_name) {
1757                         case IPV6_TCLASS:
1758                                 /* Notify tcp stacks that care (e.g. RACK). */
1759                                 break;
1760                         case IPV6_USE_MIN_MTU:
1761                                 /* Update t_maxseg accordingly. */
1762                                 break;
1763                         default:
1764                                 return (error);
1765                         }
1766                         break;
1767 #endif
1768 #ifdef INET
1769                 case IPPROTO_IP:
1770                         switch (sopt->sopt_name) {
1771                         case IP_TOS:
1772                                 inp->inp_ip_tos &= ~IPTOS_ECN_MASK;
1773                                 break;
1774                         case IP_TTL:
1775                                 /* Notify tcp stacks that care (e.g. RACK). */
1776                                 break;
1777                         default:
1778                                 return (error);
1779                         }
1780                         break;
1781 #endif
1782                 default:
1783                         return (error);
1784                 }
1785                 INP_WLOCK(inp);
1786                 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1787                         INP_WUNLOCK(inp);
1788                         return (ECONNRESET);
1789                 }
1790         } else if (sopt->sopt_name == TCP_FUNCTION_BLK) {
1791                 /*
1792                  * Protect the TCP option TCP_FUNCTION_BLK so
1793                  * that a sub-function can *never* overwrite this.
1794                  */
1795                 struct tcp_function_set fsn;
1796                 struct tcp_function_block *blk;
1797
1798                 INP_WUNLOCK(inp);
1799                 error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn);
1800                 if (error)
1801                         return (error);
1802
1803                 INP_WLOCK(inp);
1804                 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1805                         INP_WUNLOCK(inp);
1806                         return (ECONNRESET);
1807                 }
1808                 tp = intotcpcb(inp);
1809
1810                 blk = find_and_ref_tcp_functions(&fsn);
1811                 if (blk == NULL) {
1812                         INP_WUNLOCK(inp);
1813                         return (ENOENT);
1814                 }
1815                 if (tp->t_fb == blk) {
1816                         /* You already have this */
1817                         refcount_release(&blk->tfb_refcnt);
1818                         INP_WUNLOCK(inp);
1819                         return (0);
1820                 }
1821                 if (tp->t_state != TCPS_CLOSED) {
1822                         /*
1823                          * The user has advanced the state
1824                          * past the initial point, we may not
1825                          * be able to switch.
1826                          */
1827                         if (blk->tfb_tcp_handoff_ok != NULL) {
1828                                 /*
1829                                  * Does the stack provide a
1830                                  * query mechanism, if so it may
1831                                  * still be possible?
1832                                  */
1833                                 error = (*blk->tfb_tcp_handoff_ok)(tp);
1834                         } else
1835                                 error = EINVAL;
1836                         if (error) {
1837                                 refcount_release(&blk->tfb_refcnt);
1838                                 INP_WUNLOCK(inp);
1839                                 return(error);
1840                         }
1841                 }
1842                 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1843                         refcount_release(&blk->tfb_refcnt);
1844                         INP_WUNLOCK(inp);
1845                         return (ENOENT);
1846                 }
1847                 /*
1848                  * Release the old refcnt, the
1849                  * lookup acquired a ref on the
1850                  * new one already.
1851                  */
1852                 if (tp->t_fb->tfb_tcp_fb_fini) {
1853                         struct epoch_tracker et;
1854                         /*
1855                          * Tell the stack to cleanup with 0 i.e.
1856                          * the tcb is not going away.
1857                          */
1858                         NET_EPOCH_ENTER(et);
1859                         (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1860                         NET_EPOCH_EXIT(et);
1861                 }
1862 #ifdef TCPHPTS
1863                 /* Assure that we are not on any hpts */
1864                 tcp_hpts_remove(tp->t_inpcb);
1865 #endif
1866                 if (blk->tfb_tcp_fb_init) {
1867                         error = (*blk->tfb_tcp_fb_init)(tp);
1868                         if (error) {
1869                                 refcount_release(&blk->tfb_refcnt);
1870                                 if (tp->t_fb->tfb_tcp_fb_init) {
1871                                         if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0)  {
1872                                                 /* Fall back failed, drop the connection */
1873                                                 INP_WUNLOCK(inp);
1874                                                 soabort(so);
1875                                                 return (error);
1876                                         }
1877                                 }
1878                                 goto err_out;
1879                         }
1880                 }
1881                 refcount_release(&tp->t_fb->tfb_refcnt);
1882                 tp->t_fb = blk;
1883 #ifdef TCP_OFFLOAD
1884                 if (tp->t_flags & TF_TOE) {
1885                         tcp_offload_ctloutput(tp, sopt->sopt_dir,
1886                              sopt->sopt_name);
1887                 }
1888 #endif
1889 err_out:
1890                 INP_WUNLOCK(inp);
1891                 return (error);
1892         }
1893
1894         /* Pass in the INP locked, callee must unlock it. */
1895         return (tp->t_fb->tfb_tcp_ctloutput(inp, sopt));
1896 }
1897
1898 static int
1899 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt)
1900 {
1901         struct socket *so = inp->inp_socket;
1902         struct tcpcb *tp = intotcpcb(inp);
1903         int error = 0;
1904
1905         MPASS(sopt->sopt_dir == SOPT_GET);
1906         INP_WLOCK_ASSERT(inp);
1907         KASSERT((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0,
1908             ("inp_flags == %x", inp->inp_flags));
1909         KASSERT(so != NULL, ("inp_socket == NULL"));
1910
1911         if (sopt->sopt_level != IPPROTO_TCP) {
1912                 INP_WUNLOCK(inp);
1913 #ifdef INET6
1914                 if (inp->inp_vflag & INP_IPV6PROTO)
1915                         error = ip6_ctloutput(so, sopt);
1916 #endif /* INET6 */
1917 #if defined(INET6) && defined(INET)
1918                 else
1919 #endif
1920 #ifdef INET
1921                         error = ip_ctloutput(so, sopt);
1922 #endif
1923                 return (error);
1924         }
1925         if (((sopt->sopt_name == TCP_FUNCTION_BLK) ||
1926              (sopt->sopt_name == TCP_FUNCTION_ALIAS))) {
1927                 struct tcp_function_set fsn;
1928
1929                 if (sopt->sopt_name == TCP_FUNCTION_ALIAS) {
1930                         memset(&fsn, 0, sizeof(fsn));
1931                         find_tcp_function_alias(tp->t_fb, &fsn);
1932                 } else {
1933                         strncpy(fsn.function_set_name,
1934                             tp->t_fb->tfb_tcp_block_name,
1935                             TCP_FUNCTION_NAME_LEN_MAX);
1936                         fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1937                 }
1938                 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1939                 INP_WUNLOCK(inp);
1940                 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1941                 return (error);
1942         }
1943
1944         /* Pass in the INP locked, callee must unlock it. */
1945         return (tp->t_fb->tfb_tcp_ctloutput(inp, sopt));
1946 }
1947
1948 int
1949 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1950 {
1951         struct  inpcb *inp;
1952
1953         inp = sotoinpcb(so);
1954         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1955
1956         INP_WLOCK(inp);
1957         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1958                 INP_WUNLOCK(inp);
1959                 return (ECONNRESET);
1960         }
1961         if (sopt->sopt_dir == SOPT_SET)
1962                 return (tcp_ctloutput_set(inp, sopt));
1963         else if (sopt->sopt_dir == SOPT_GET)
1964                 return (tcp_ctloutput_get(inp, sopt));
1965         else
1966                 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
1967 }
1968
1969 /*
1970  * If this assert becomes untrue, we need to change the size of the buf
1971  * variable in tcp_default_ctloutput().
1972  */
1973 #ifdef CTASSERT
1974 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1975 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1976 #endif
1977
1978 #ifdef KERN_TLS
1979 static int
1980 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
1981 {
1982         struct tls_enable_v0 tls_v0;
1983         int error;
1984
1985         if (sopt->sopt_valsize == sizeof(tls_v0)) {
1986                 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
1987                     sizeof(tls_v0));
1988                 if (error)
1989                         return (error);
1990                 memset(tls, 0, sizeof(*tls));
1991                 tls->cipher_key = tls_v0.cipher_key;
1992                 tls->iv = tls_v0.iv;
1993                 tls->auth_key = tls_v0.auth_key;
1994                 tls->cipher_algorithm = tls_v0.cipher_algorithm;
1995                 tls->cipher_key_len = tls_v0.cipher_key_len;
1996                 tls->iv_len = tls_v0.iv_len;
1997                 tls->auth_algorithm = tls_v0.auth_algorithm;
1998                 tls->auth_key_len = tls_v0.auth_key_len;
1999                 tls->flags = tls_v0.flags;
2000                 tls->tls_vmajor = tls_v0.tls_vmajor;
2001                 tls->tls_vminor = tls_v0.tls_vminor;
2002                 return (0);
2003         }
2004
2005         return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
2006 }
2007 #endif
2008
2009 extern struct cc_algo newreno_cc_algo;
2010
2011 static int
2012 tcp_set_cc_mod(struct inpcb *inp, struct sockopt *sopt)
2013 {
2014         struct cc_algo *algo;
2015         void *ptr = NULL;
2016         struct tcpcb *tp;
2017         struct cc_var cc_mem;
2018         char    buf[TCP_CA_NAME_MAX];
2019         size_t mem_sz;
2020         int error;
2021
2022         INP_WUNLOCK(inp);
2023         error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
2024         if (error)
2025                 return(error);
2026         buf[sopt->sopt_valsize] = '\0';
2027         CC_LIST_RLOCK();
2028         STAILQ_FOREACH(algo, &cc_list, entries) {
2029                 if (strncmp(buf, algo->name,
2030                             TCP_CA_NAME_MAX) == 0) {
2031                         if (algo->flags & CC_MODULE_BEING_REMOVED) {
2032                                 /* We can't "see" modules being unloaded */
2033                                 continue;
2034                         }
2035                         break;
2036                 }
2037         }
2038         if (algo == NULL) {
2039                 CC_LIST_RUNLOCK();
2040                 return(ESRCH);
2041         }
2042         /*
2043          * With a reference the algorithm cannot be removed
2044          * so we hold a reference through the change process.
2045          */
2046         cc_refer(algo);
2047         CC_LIST_RUNLOCK();
2048         if (algo->cb_init != NULL) {
2049                 /* We can now pre-get the memory for the CC */
2050                 mem_sz = (*algo->cc_data_sz)();
2051                 if (mem_sz == 0) {
2052                         goto no_mem_needed;
2053                 }
2054                 ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK);
2055         } else {
2056 no_mem_needed:
2057                 mem_sz = 0;
2058                 ptr = NULL;
2059         }
2060         /*
2061          * Make sure its all clean and zero and also get
2062          * back the inplock.
2063          */
2064         memset(&cc_mem, 0, sizeof(cc_mem));
2065         INP_WLOCK(inp);
2066         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
2067                 INP_WUNLOCK(inp);
2068                 if (ptr)
2069                         free(ptr, M_CC_MEM);
2070                 /* Release our temp reference */
2071                 CC_LIST_RLOCK();
2072                 cc_release(algo);
2073                 CC_LIST_RUNLOCK();
2074                 return (ECONNRESET);
2075         }
2076         tp = intotcpcb(inp);
2077         if (ptr != NULL)
2078                 memset(ptr, 0, mem_sz);
2079         cc_mem.ccvc.tcp = tp;
2080         /*
2081          * We once again hold a write lock over the tcb so it's
2082          * safe to do these things without ordering concerns.
2083          * Note here we init into stack memory.
2084          */
2085         if (algo->cb_init != NULL)
2086                 error = algo->cb_init(&cc_mem, ptr);
2087         else
2088                 error = 0;
2089         /*
2090          * The CC algorithms, when given their memory
2091          * should not fail we could in theory have a
2092          * KASSERT here.
2093          */
2094         if (error == 0) {
2095                 /*
2096                  * Touchdown, lets go ahead and move the
2097                  * connection to the new CC module by
2098                  * copying in the cc_mem after we call
2099                  * the old ones cleanup (if any).
2100                  */
2101                 if (CC_ALGO(tp)->cb_destroy != NULL)
2102                         CC_ALGO(tp)->cb_destroy(tp->ccv);
2103                 /* Detach the old CC from the tcpcb  */
2104                 cc_detach(tp);
2105                 /* Copy in our temp memory that was inited */
2106                 memcpy(tp->ccv, &cc_mem, sizeof(struct cc_var));
2107                 /* Now attach the new, which takes a reference */
2108                 cc_attach(tp, algo);
2109                 /* Ok now are we where we have gotten past any conn_init? */
2110                 if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) {
2111                         /* Yep run the connection init for the new CC */
2112                         CC_ALGO(tp)->conn_init(tp->ccv);
2113                 }
2114         } else if (ptr)
2115                 free(ptr, M_CC_MEM);
2116         INP_WUNLOCK(inp);
2117         /* Now lets release our temp reference */
2118         CC_LIST_RLOCK();
2119         cc_release(algo);
2120         CC_LIST_RUNLOCK();
2121         return (error);
2122 }
2123
2124 int
2125 tcp_default_ctloutput(struct inpcb *inp, struct sockopt *sopt)
2126 {
2127         struct tcpcb *tp = intotcpcb(inp);
2128         int     error, opt, optval;
2129         u_int   ui;
2130         struct  tcp_info ti;
2131 #ifdef KERN_TLS
2132         struct tls_enable tls;
2133         struct socket *so = inp->inp_socket;
2134 #endif
2135         char    *pbuf, buf[TCP_LOG_ID_LEN];
2136 #ifdef STATS
2137         struct statsblob *sbp;
2138 #endif
2139         size_t  len;
2140
2141         INP_WLOCK_ASSERT(inp);
2142         KASSERT((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0,
2143             ("inp_flags == %x", inp->inp_flags));
2144         KASSERT(inp->inp_socket != NULL, ("inp_socket == NULL"));
2145
2146         switch (sopt->sopt_level) {
2147 #ifdef INET6
2148         case IPPROTO_IPV6:
2149                 MPASS(inp->inp_vflag & INP_IPV6PROTO);
2150                 switch (sopt->sopt_name) {
2151                 case IPV6_USE_MIN_MTU:
2152                         tcp6_use_min_mtu(tp);
2153                         /* FALLTHROUGH */
2154                 }
2155                 INP_WUNLOCK(inp);
2156                 return (0);
2157 #endif
2158 #ifdef INET
2159         case IPPROTO_IP:
2160                 INP_WUNLOCK(inp);
2161                 return (0);
2162 #endif
2163         }
2164
2165         /*
2166          * For TCP_CCALGOOPT forward the control to CC module, for both
2167          * SOPT_SET and SOPT_GET.
2168          */
2169         switch (sopt->sopt_name) {
2170         case TCP_CCALGOOPT:
2171                 INP_WUNLOCK(inp);
2172                 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
2173                         return (EINVAL);
2174                 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
2175                 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
2176                     sopt->sopt_valsize);
2177                 if (error) {
2178                         free(pbuf, M_TEMP);
2179                         return (error);
2180                 }
2181                 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
2182                 if (CC_ALGO(tp)->ctl_output != NULL)
2183                         error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
2184                 else
2185                         error = ENOENT;
2186                 INP_WUNLOCK(inp);
2187                 if (error == 0 && sopt->sopt_dir == SOPT_GET)
2188                         error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
2189                 free(pbuf, M_TEMP);
2190                 return (error);
2191         }
2192
2193         switch (sopt->sopt_dir) {
2194         case SOPT_SET:
2195                 switch (sopt->sopt_name) {
2196 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2197                 case TCP_MD5SIG:
2198                         INP_WUNLOCK(inp);
2199                         if (!TCPMD5_ENABLED())
2200                                 return (ENOPROTOOPT);
2201                         error = TCPMD5_PCBCTL(inp, sopt);
2202                         if (error)
2203                                 return (error);
2204                         INP_WLOCK_RECHECK(inp);
2205                         goto unlock_and_done;
2206 #endif /* IPSEC */
2207
2208                 case TCP_NODELAY:
2209                 case TCP_NOOPT:
2210                 case TCP_LRD:
2211                         INP_WUNLOCK(inp);
2212                         error = sooptcopyin(sopt, &optval, sizeof optval,
2213                             sizeof optval);
2214                         if (error)
2215                                 return (error);
2216
2217                         INP_WLOCK_RECHECK(inp);
2218                         switch (sopt->sopt_name) {
2219                         case TCP_NODELAY:
2220                                 opt = TF_NODELAY;
2221                                 break;
2222                         case TCP_NOOPT:
2223                                 opt = TF_NOOPT;
2224                                 break;
2225                         case TCP_LRD:
2226                                 opt = TF_LRD;
2227                                 break;
2228                         default:
2229                                 opt = 0; /* dead code to fool gcc */
2230                                 break;
2231                         }
2232
2233                         if (optval)
2234                                 tp->t_flags |= opt;
2235                         else
2236                                 tp->t_flags &= ~opt;
2237 unlock_and_done:
2238 #ifdef TCP_OFFLOAD
2239                         if (tp->t_flags & TF_TOE) {
2240                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
2241                                     sopt->sopt_name);
2242                         }
2243 #endif
2244                         INP_WUNLOCK(inp);
2245                         break;
2246
2247                 case TCP_NOPUSH:
2248                         INP_WUNLOCK(inp);
2249                         error = sooptcopyin(sopt, &optval, sizeof optval,
2250                             sizeof optval);
2251                         if (error)
2252                                 return (error);
2253
2254                         INP_WLOCK_RECHECK(inp);
2255                         if (optval)
2256                                 tp->t_flags |= TF_NOPUSH;
2257                         else if (tp->t_flags & TF_NOPUSH) {
2258                                 tp->t_flags &= ~TF_NOPUSH;
2259                                 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2260                                         struct epoch_tracker et;
2261
2262                                         NET_EPOCH_ENTER(et);
2263                                         error = tcp_output_nodrop(tp);
2264                                         NET_EPOCH_EXIT(et);
2265                                 }
2266                         }
2267                         goto unlock_and_done;
2268
2269                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2270                         INP_WUNLOCK(inp);
2271                         error = sooptcopyin(sopt, &optval, sizeof optval,
2272                             sizeof optval);
2273                         if (error)
2274                                 return (error);
2275                         if ((optval < TCP_TUNNELING_PORT_MIN) ||
2276                             (optval > TCP_TUNNELING_PORT_MAX)) {
2277                                 /* Its got to be in range */
2278                                 return (EINVAL);
2279                         }
2280                         if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
2281                                 /* You have to have enabled a UDP tunneling port first */
2282                                 return (EINVAL);
2283                         }
2284                         INP_WLOCK_RECHECK(inp);
2285                         if (tp->t_state != TCPS_CLOSED) {
2286                                 /* You can't change after you are connected */
2287                                 error = EINVAL;
2288                         } else {
2289                                 /* Ok we are all good set the port */
2290                                 tp->t_port = htons(optval);
2291                         }
2292                         goto unlock_and_done;
2293
2294                 case TCP_MAXSEG:
2295                         INP_WUNLOCK(inp);
2296                         error = sooptcopyin(sopt, &optval, sizeof optval,
2297                             sizeof optval);
2298                         if (error)
2299                                 return (error);
2300
2301                         INP_WLOCK_RECHECK(inp);
2302                         if (optval > 0 && optval <= tp->t_maxseg &&
2303                             optval + 40 >= V_tcp_minmss)
2304                                 tp->t_maxseg = optval;
2305                         else
2306                                 error = EINVAL;
2307                         goto unlock_and_done;
2308
2309                 case TCP_INFO:
2310                         INP_WUNLOCK(inp);
2311                         error = EINVAL;
2312                         break;
2313
2314                 case TCP_STATS:
2315                         INP_WUNLOCK(inp);
2316 #ifdef STATS
2317                         error = sooptcopyin(sopt, &optval, sizeof optval,
2318                             sizeof optval);
2319                         if (error)
2320                                 return (error);
2321
2322                         if (optval > 0)
2323                                 sbp = stats_blob_alloc(
2324                                     V_tcp_perconn_stats_dflt_tpl, 0);
2325                         else
2326                                 sbp = NULL;
2327
2328                         INP_WLOCK_RECHECK(inp);
2329                         if ((tp->t_stats != NULL && sbp == NULL) ||
2330                             (tp->t_stats == NULL && sbp != NULL)) {
2331                                 struct statsblob *t = tp->t_stats;
2332                                 tp->t_stats = sbp;
2333                                 sbp = t;
2334                         }
2335                         INP_WUNLOCK(inp);
2336
2337                         stats_blob_destroy(sbp);
2338 #else
2339                         return (EOPNOTSUPP);
2340 #endif /* !STATS */
2341                         break;
2342
2343                 case TCP_CONGESTION:
2344                         error = tcp_set_cc_mod(inp, sopt);
2345                         break;
2346
2347                 case TCP_REUSPORT_LB_NUMA:
2348                         INP_WUNLOCK(inp);
2349                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2350                             sizeof(optval));
2351                         INP_WLOCK_RECHECK(inp);
2352                         if (!error)
2353                                 error = in_pcblbgroup_numa(inp, optval);
2354                         INP_WUNLOCK(inp);
2355                         break;
2356
2357 #ifdef KERN_TLS
2358                 case TCP_TXTLS_ENABLE:
2359                         INP_WUNLOCK(inp);
2360                         error = copyin_tls_enable(sopt, &tls);
2361                         if (error)
2362                                 break;
2363                         error = ktls_enable_tx(so, &tls);
2364                         break;
2365                 case TCP_TXTLS_MODE:
2366                         INP_WUNLOCK(inp);
2367                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2368                         if (error)
2369                                 return (error);
2370
2371                         INP_WLOCK_RECHECK(inp);
2372                         error = ktls_set_tx_mode(so, ui);
2373                         INP_WUNLOCK(inp);
2374                         break;
2375                 case TCP_RXTLS_ENABLE:
2376                         INP_WUNLOCK(inp);
2377                         error = sooptcopyin(sopt, &tls, sizeof(tls),
2378                             sizeof(tls));
2379                         if (error)
2380                                 break;
2381                         error = ktls_enable_rx(so, &tls);
2382                         break;
2383 #endif
2384
2385                 case TCP_KEEPIDLE:
2386                 case TCP_KEEPINTVL:
2387                 case TCP_KEEPINIT:
2388                         INP_WUNLOCK(inp);
2389                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2390                         if (error)
2391                                 return (error);
2392
2393                         if (ui > (UINT_MAX / hz)) {
2394                                 error = EINVAL;
2395                                 break;
2396                         }
2397                         ui *= hz;
2398
2399                         INP_WLOCK_RECHECK(inp);
2400                         switch (sopt->sopt_name) {
2401                         case TCP_KEEPIDLE:
2402                                 tp->t_keepidle = ui;
2403                                 /*
2404                                  * XXX: better check current remaining
2405                                  * timeout and "merge" it with new value.
2406                                  */
2407                                 if ((tp->t_state > TCPS_LISTEN) &&
2408                                     (tp->t_state <= TCPS_CLOSING))
2409                                         tcp_timer_activate(tp, TT_KEEP,
2410                                             TP_KEEPIDLE(tp));
2411                                 break;
2412                         case TCP_KEEPINTVL:
2413                                 tp->t_keepintvl = ui;
2414                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2415                                     (TP_MAXIDLE(tp) > 0))
2416                                         tcp_timer_activate(tp, TT_2MSL,
2417                                             TP_MAXIDLE(tp));
2418                                 break;
2419                         case TCP_KEEPINIT:
2420                                 tp->t_keepinit = ui;
2421                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
2422                                     tp->t_state == TCPS_SYN_SENT)
2423                                         tcp_timer_activate(tp, TT_KEEP,
2424                                             TP_KEEPINIT(tp));
2425                                 break;
2426                         }
2427                         goto unlock_and_done;
2428
2429                 case TCP_KEEPCNT:
2430                         INP_WUNLOCK(inp);
2431                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2432                         if (error)
2433                                 return (error);
2434
2435                         INP_WLOCK_RECHECK(inp);
2436                         tp->t_keepcnt = ui;
2437                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2438                             (TP_MAXIDLE(tp) > 0))
2439                                 tcp_timer_activate(tp, TT_2MSL,
2440                                     TP_MAXIDLE(tp));
2441                         goto unlock_and_done;
2442
2443 #ifdef TCPPCAP
2444                 case TCP_PCAP_OUT:
2445                 case TCP_PCAP_IN:
2446                         INP_WUNLOCK(inp);
2447                         error = sooptcopyin(sopt, &optval, sizeof optval,
2448                             sizeof optval);
2449                         if (error)
2450                                 return (error);
2451
2452                         INP_WLOCK_RECHECK(inp);
2453                         if (optval >= 0)
2454                                 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2455                                         &(tp->t_outpkts) : &(tp->t_inpkts),
2456                                         optval);
2457                         else
2458                                 error = EINVAL;
2459                         goto unlock_and_done;
2460 #endif
2461
2462                 case TCP_FASTOPEN: {
2463                         struct tcp_fastopen tfo_optval;
2464
2465                         INP_WUNLOCK(inp);
2466                         if (!V_tcp_fastopen_client_enable &&
2467                             !V_tcp_fastopen_server_enable)
2468                                 return (EPERM);
2469
2470                         error = sooptcopyin(sopt, &tfo_optval,
2471                                     sizeof(tfo_optval), sizeof(int));
2472                         if (error)
2473                                 return (error);
2474
2475                         INP_WLOCK_RECHECK(inp);
2476                         if ((tp->t_state != TCPS_CLOSED) &&
2477                             (tp->t_state != TCPS_LISTEN)) {
2478                                 error = EINVAL;
2479                                 goto unlock_and_done;
2480                         }
2481                         if (tfo_optval.enable) {
2482                                 if (tp->t_state == TCPS_LISTEN) {
2483                                         if (!V_tcp_fastopen_server_enable) {
2484                                                 error = EPERM;
2485                                                 goto unlock_and_done;
2486                                         }
2487
2488                                         if (tp->t_tfo_pending == NULL)
2489                                                 tp->t_tfo_pending =
2490                                                     tcp_fastopen_alloc_counter();
2491                                 } else {
2492                                         /*
2493                                          * If a pre-shared key was provided,
2494                                          * stash it in the client cookie
2495                                          * field of the tcpcb for use during
2496                                          * connect.
2497                                          */
2498                                         if (sopt->sopt_valsize ==
2499                                             sizeof(tfo_optval)) {
2500                                                 memcpy(tp->t_tfo_cookie.client,
2501                                                        tfo_optval.psk,
2502                                                        TCP_FASTOPEN_PSK_LEN);
2503                                                 tp->t_tfo_client_cookie_len =
2504                                                     TCP_FASTOPEN_PSK_LEN;
2505                                         }
2506                                 }
2507                                 tp->t_flags |= TF_FASTOPEN;
2508                         } else
2509                                 tp->t_flags &= ~TF_FASTOPEN;
2510                         goto unlock_and_done;
2511                 }
2512
2513 #ifdef TCP_BLACKBOX
2514                 case TCP_LOG:
2515                         INP_WUNLOCK(inp);
2516                         error = sooptcopyin(sopt, &optval, sizeof optval,
2517                             sizeof optval);
2518                         if (error)
2519                                 return (error);
2520
2521                         INP_WLOCK_RECHECK(inp);
2522                         error = tcp_log_state_change(tp, optval);
2523                         goto unlock_and_done;
2524
2525                 case TCP_LOGBUF:
2526                         INP_WUNLOCK(inp);
2527                         error = EINVAL;
2528                         break;
2529
2530                 case TCP_LOGID:
2531                         INP_WUNLOCK(inp);
2532                         error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2533                         if (error)
2534                                 break;
2535                         buf[sopt->sopt_valsize] = '\0';
2536                         INP_WLOCK_RECHECK(inp);
2537                         error = tcp_log_set_id(tp, buf);
2538                         /* tcp_log_set_id() unlocks the INP. */
2539                         break;
2540
2541                 case TCP_LOGDUMP:
2542                 case TCP_LOGDUMPID:
2543                         INP_WUNLOCK(inp);
2544                         error =
2545                             sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2546                         if (error)
2547                                 break;
2548                         buf[sopt->sopt_valsize] = '\0';
2549                         INP_WLOCK_RECHECK(inp);
2550                         if (sopt->sopt_name == TCP_LOGDUMP) {
2551                                 error = tcp_log_dump_tp_logbuf(tp, buf,
2552                                     M_WAITOK, true);
2553                                 INP_WUNLOCK(inp);
2554                         } else {
2555                                 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2556                                 /*
2557                                  * tcp_log_dump_tp_bucket_logbufs() drops the
2558                                  * INP lock.
2559                                  */
2560                         }
2561                         break;
2562 #endif
2563
2564                 default:
2565                         INP_WUNLOCK(inp);
2566                         error = ENOPROTOOPT;
2567                         break;
2568                 }
2569                 break;
2570
2571         case SOPT_GET:
2572                 tp = intotcpcb(inp);
2573                 switch (sopt->sopt_name) {
2574 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2575                 case TCP_MD5SIG:
2576                         INP_WUNLOCK(inp);
2577                         if (!TCPMD5_ENABLED())
2578                                 return (ENOPROTOOPT);
2579                         error = TCPMD5_PCBCTL(inp, sopt);
2580                         break;
2581 #endif
2582
2583                 case TCP_NODELAY:
2584                         optval = tp->t_flags & TF_NODELAY;
2585                         INP_WUNLOCK(inp);
2586                         error = sooptcopyout(sopt, &optval, sizeof optval);
2587                         break;
2588                 case TCP_MAXSEG:
2589                         optval = tp->t_maxseg;
2590                         INP_WUNLOCK(inp);
2591                         error = sooptcopyout(sopt, &optval, sizeof optval);
2592                         break;
2593                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2594                         optval = ntohs(tp->t_port);
2595                         INP_WUNLOCK(inp);
2596                         error = sooptcopyout(sopt, &optval, sizeof optval);
2597                         break;
2598                 case TCP_NOOPT:
2599                         optval = tp->t_flags & TF_NOOPT;
2600                         INP_WUNLOCK(inp);
2601                         error = sooptcopyout(sopt, &optval, sizeof optval);
2602                         break;
2603                 case TCP_NOPUSH:
2604                         optval = tp->t_flags & TF_NOPUSH;
2605                         INP_WUNLOCK(inp);
2606                         error = sooptcopyout(sopt, &optval, sizeof optval);
2607                         break;
2608                 case TCP_INFO:
2609                         tcp_fill_info(tp, &ti);
2610                         INP_WUNLOCK(inp);
2611                         error = sooptcopyout(sopt, &ti, sizeof ti);
2612                         break;
2613                 case TCP_STATS:
2614                         {
2615 #ifdef STATS
2616                         int nheld;
2617                         TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2618
2619                         error = 0;
2620                         socklen_t outsbsz = sopt->sopt_valsize;
2621                         if (tp->t_stats == NULL)
2622                                 error = ENOENT;
2623                         else if (outsbsz >= tp->t_stats->cursz)
2624                                 outsbsz = tp->t_stats->cursz;
2625                         else if (outsbsz >= sizeof(struct statsblob))
2626                                 outsbsz = sizeof(struct statsblob);
2627                         else
2628                                 error = EINVAL;
2629                         INP_WUNLOCK(inp);
2630                         if (error)
2631                                 break;
2632
2633                         sbp = sopt->sopt_val;
2634                         nheld = atop(round_page(((vm_offset_t)sbp) +
2635                             (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2636                         vm_page_t ma[nheld];
2637                         if (vm_fault_quick_hold_pages(
2638                             &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2639                             outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2640                             nheld) < 0) {
2641                                 error = EFAULT;
2642                                 break;
2643                         }
2644
2645                         if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2646                             SIZEOF_MEMBER(struct statsblob, flags))))
2647                                 goto unhold;
2648
2649                         INP_WLOCK_RECHECK(inp);
2650                         error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2651                             sbflags | SB_CLONE_USRDSTNOFAULT);
2652                         INP_WUNLOCK(inp);
2653                         sopt->sopt_valsize = outsbsz;
2654 unhold:
2655                         vm_page_unhold_pages(ma, nheld);
2656 #else
2657                         INP_WUNLOCK(inp);
2658                         error = EOPNOTSUPP;
2659 #endif /* !STATS */
2660                         break;
2661                         }
2662                 case TCP_CONGESTION:
2663                         len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2664                         INP_WUNLOCK(inp);
2665                         error = sooptcopyout(sopt, buf, len + 1);
2666                         break;
2667                 case TCP_KEEPIDLE:
2668                 case TCP_KEEPINTVL:
2669                 case TCP_KEEPINIT:
2670                 case TCP_KEEPCNT:
2671                         switch (sopt->sopt_name) {
2672                         case TCP_KEEPIDLE:
2673                                 ui = TP_KEEPIDLE(tp) / hz;
2674                                 break;
2675                         case TCP_KEEPINTVL:
2676                                 ui = TP_KEEPINTVL(tp) / hz;
2677                                 break;
2678                         case TCP_KEEPINIT:
2679                                 ui = TP_KEEPINIT(tp) / hz;
2680                                 break;
2681                         case TCP_KEEPCNT:
2682                                 ui = TP_KEEPCNT(tp);
2683                                 break;
2684                         }
2685                         INP_WUNLOCK(inp);
2686                         error = sooptcopyout(sopt, &ui, sizeof(ui));
2687                         break;
2688 #ifdef TCPPCAP
2689                 case TCP_PCAP_OUT:
2690                 case TCP_PCAP_IN:
2691                         optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2692                                         &(tp->t_outpkts) : &(tp->t_inpkts));
2693                         INP_WUNLOCK(inp);
2694                         error = sooptcopyout(sopt, &optval, sizeof optval);
2695                         break;
2696 #endif
2697                 case TCP_FASTOPEN:
2698                         optval = tp->t_flags & TF_FASTOPEN;
2699                         INP_WUNLOCK(inp);
2700                         error = sooptcopyout(sopt, &optval, sizeof optval);
2701                         break;
2702 #ifdef TCP_BLACKBOX
2703                 case TCP_LOG:
2704                         optval = tp->t_logstate;
2705                         INP_WUNLOCK(inp);
2706                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2707                         break;
2708                 case TCP_LOGBUF:
2709                         /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2710                         error = tcp_log_getlogbuf(sopt, tp);
2711                         break;
2712                 case TCP_LOGID:
2713                         len = tcp_log_get_id(tp, buf);
2714                         INP_WUNLOCK(inp);
2715                         error = sooptcopyout(sopt, buf, len + 1);
2716                         break;
2717                 case TCP_LOGDUMP:
2718                 case TCP_LOGDUMPID:
2719                         INP_WUNLOCK(inp);
2720                         error = EINVAL;
2721                         break;
2722 #endif
2723 #ifdef KERN_TLS
2724                 case TCP_TXTLS_MODE:
2725                         error = ktls_get_tx_mode(so, &optval);
2726                         INP_WUNLOCK(inp);
2727                         if (error == 0)
2728                                 error = sooptcopyout(sopt, &optval,
2729                                     sizeof(optval));
2730                         break;
2731                 case TCP_RXTLS_MODE:
2732                         error = ktls_get_rx_mode(so, &optval);
2733                         INP_WUNLOCK(inp);
2734                         if (error == 0)
2735                                 error = sooptcopyout(sopt, &optval,
2736                                     sizeof(optval));
2737                         break;
2738 #endif
2739                 case TCP_LRD:
2740                         optval = tp->t_flags & TF_LRD;
2741                         INP_WUNLOCK(inp);
2742                         error = sooptcopyout(sopt, &optval, sizeof optval);
2743                         break;
2744                 default:
2745                         INP_WUNLOCK(inp);
2746                         error = ENOPROTOOPT;
2747                         break;
2748                 }
2749                 break;
2750         }
2751         return (error);
2752 }
2753 #undef INP_WLOCK_RECHECK
2754 #undef INP_WLOCK_RECHECK_CLEANUP
2755
2756 /*
2757  * Initiate (or continue) disconnect.
2758  * If embryonic state, just send reset (once).
2759  * If in ``let data drain'' option and linger null, just drop.
2760  * Otherwise (hard), mark socket disconnecting and drop
2761  * current input data; switch states based on user close, and
2762  * send segment to peer (with FIN).
2763  */
2764 static void
2765 tcp_disconnect(struct tcpcb *tp)
2766 {
2767         struct inpcb *inp = tp->t_inpcb;
2768         struct socket *so = inp->inp_socket;
2769
2770         NET_EPOCH_ASSERT();
2771         INP_WLOCK_ASSERT(inp);
2772
2773         /*
2774          * Neither tcp_close() nor tcp_drop() should return NULL, as the
2775          * socket is still open.
2776          */
2777         if (tp->t_state < TCPS_ESTABLISHED &&
2778             !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2779                 tp = tcp_close(tp);
2780                 KASSERT(tp != NULL,
2781                     ("tcp_disconnect: tcp_close() returned NULL"));
2782         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2783                 tp = tcp_drop(tp, 0);
2784                 KASSERT(tp != NULL,
2785                     ("tcp_disconnect: tcp_drop() returned NULL"));
2786         } else {
2787                 soisdisconnecting(so);
2788                 sbflush(&so->so_rcv);
2789                 tcp_usrclosed(tp);
2790                 if (!(inp->inp_flags & INP_DROPPED))
2791                         /* Ignore stack's drop request, we already at it. */
2792                         (void)tcp_output_nodrop(tp);
2793         }
2794 }
2795
2796 /*
2797  * User issued close, and wish to trail through shutdown states:
2798  * if never received SYN, just forget it.  If got a SYN from peer,
2799  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2800  * If already got a FIN from peer, then almost done; go to LAST_ACK
2801  * state.  In all other cases, have already sent FIN to peer (e.g.
2802  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2803  * for peer to send FIN or not respond to keep-alives, etc.
2804  * We can let the user exit from the close as soon as the FIN is acked.
2805  */
2806 static void
2807 tcp_usrclosed(struct tcpcb *tp)
2808 {
2809
2810         NET_EPOCH_ASSERT();
2811         INP_WLOCK_ASSERT(tp->t_inpcb);
2812
2813         switch (tp->t_state) {
2814         case TCPS_LISTEN:
2815 #ifdef TCP_OFFLOAD
2816                 tcp_offload_listen_stop(tp);
2817 #endif
2818                 tcp_state_change(tp, TCPS_CLOSED);
2819                 /* FALLTHROUGH */
2820         case TCPS_CLOSED:
2821                 tp = tcp_close(tp);
2822                 /*
2823                  * tcp_close() should never return NULL here as the socket is
2824                  * still open.
2825                  */
2826                 KASSERT(tp != NULL,
2827                     ("tcp_usrclosed: tcp_close() returned NULL"));
2828                 break;
2829
2830         case TCPS_SYN_SENT:
2831         case TCPS_SYN_RECEIVED:
2832                 tp->t_flags |= TF_NEEDFIN;
2833                 break;
2834
2835         case TCPS_ESTABLISHED:
2836                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2837                 break;
2838
2839         case TCPS_CLOSE_WAIT:
2840                 tcp_state_change(tp, TCPS_LAST_ACK);
2841                 break;
2842         }
2843         if (tp->t_state >= TCPS_FIN_WAIT_2) {
2844                 soisdisconnected(tp->t_inpcb->inp_socket);
2845                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2846                 if (tp->t_state == TCPS_FIN_WAIT_2) {
2847                         int timeout;
2848
2849                         timeout = (tcp_fast_finwait2_recycle) ?
2850                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
2851                         tcp_timer_activate(tp, TT_2MSL, timeout);
2852                 }
2853         }
2854 }
2855
2856 #ifdef DDB
2857 static void
2858 db_print_indent(int indent)
2859 {
2860         int i;
2861
2862         for (i = 0; i < indent; i++)
2863                 db_printf(" ");
2864 }
2865
2866 static void
2867 db_print_tstate(int t_state)
2868 {
2869
2870         switch (t_state) {
2871         case TCPS_CLOSED:
2872                 db_printf("TCPS_CLOSED");
2873                 return;
2874
2875         case TCPS_LISTEN:
2876                 db_printf("TCPS_LISTEN");
2877                 return;
2878
2879         case TCPS_SYN_SENT:
2880                 db_printf("TCPS_SYN_SENT");
2881                 return;
2882
2883         case TCPS_SYN_RECEIVED:
2884                 db_printf("TCPS_SYN_RECEIVED");
2885                 return;
2886
2887         case TCPS_ESTABLISHED:
2888                 db_printf("TCPS_ESTABLISHED");
2889                 return;
2890
2891         case TCPS_CLOSE_WAIT:
2892                 db_printf("TCPS_CLOSE_WAIT");
2893                 return;
2894
2895         case TCPS_FIN_WAIT_1:
2896                 db_printf("TCPS_FIN_WAIT_1");
2897                 return;
2898
2899         case TCPS_CLOSING:
2900                 db_printf("TCPS_CLOSING");
2901                 return;
2902
2903         case TCPS_LAST_ACK:
2904                 db_printf("TCPS_LAST_ACK");
2905                 return;
2906
2907         case TCPS_FIN_WAIT_2:
2908                 db_printf("TCPS_FIN_WAIT_2");
2909                 return;
2910
2911         case TCPS_TIME_WAIT:
2912                 db_printf("TCPS_TIME_WAIT");
2913                 return;
2914
2915         default:
2916                 db_printf("unknown");
2917                 return;
2918         }
2919 }
2920
2921 static void
2922 db_print_tflags(u_int t_flags)
2923 {
2924         int comma;
2925
2926         comma = 0;
2927         if (t_flags & TF_ACKNOW) {
2928                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2929                 comma = 1;
2930         }
2931         if (t_flags & TF_DELACK) {
2932                 db_printf("%sTF_DELACK", comma ? ", " : "");
2933                 comma = 1;
2934         }
2935         if (t_flags & TF_NODELAY) {
2936                 db_printf("%sTF_NODELAY", comma ? ", " : "");
2937                 comma = 1;
2938         }
2939         if (t_flags & TF_NOOPT) {
2940                 db_printf("%sTF_NOOPT", comma ? ", " : "");
2941                 comma = 1;
2942         }
2943         if (t_flags & TF_SENTFIN) {
2944                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2945                 comma = 1;
2946         }
2947         if (t_flags & TF_REQ_SCALE) {
2948                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2949                 comma = 1;
2950         }
2951         if (t_flags & TF_RCVD_SCALE) {
2952                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2953                 comma = 1;
2954         }
2955         if (t_flags & TF_REQ_TSTMP) {
2956                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2957                 comma = 1;
2958         }
2959         if (t_flags & TF_RCVD_TSTMP) {
2960                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2961                 comma = 1;
2962         }
2963         if (t_flags & TF_SACK_PERMIT) {
2964                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2965                 comma = 1;
2966         }
2967         if (t_flags & TF_NEEDSYN) {
2968                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2969                 comma = 1;
2970         }
2971         if (t_flags & TF_NEEDFIN) {
2972                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2973                 comma = 1;
2974         }
2975         if (t_flags & TF_NOPUSH) {
2976                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2977                 comma = 1;
2978         }
2979         if (t_flags & TF_PREVVALID) {
2980                 db_printf("%sTF_PREVVALID", comma ? ", " : "");
2981                 comma = 1;
2982         }
2983         if (t_flags & TF_MORETOCOME) {
2984                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2985                 comma = 1;
2986         }
2987         if (t_flags & TF_LQ_OVERFLOW) {
2988                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2989                 comma = 1;
2990         }
2991         if (t_flags & TF_LASTIDLE) {
2992                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2993                 comma = 1;
2994         }
2995         if (t_flags & TF_RXWIN0SENT) {
2996                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2997                 comma = 1;
2998         }
2999         if (t_flags & TF_FASTRECOVERY) {
3000                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
3001                 comma = 1;
3002         }
3003         if (t_flags & TF_CONGRECOVERY) {
3004                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
3005                 comma = 1;
3006         }
3007         if (t_flags & TF_WASFRECOVERY) {
3008                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
3009                 comma = 1;
3010         }
3011         if (t_flags & TF_WASCRECOVERY) {
3012                 db_printf("%sTF_WASCRECOVERY", comma ? ", " : "");
3013                 comma = 1;
3014         }
3015         if (t_flags & TF_SIGNATURE) {
3016                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
3017                 comma = 1;
3018         }
3019         if (t_flags & TF_FORCEDATA) {
3020                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
3021                 comma = 1;
3022         }
3023         if (t_flags & TF_TSO) {
3024                 db_printf("%sTF_TSO", comma ? ", " : "");
3025                 comma = 1;
3026         }
3027         if (t_flags & TF_FASTOPEN) {
3028                 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
3029                 comma = 1;
3030         }
3031 }
3032
3033 static void
3034 db_print_tflags2(u_int t_flags2)
3035 {
3036         int comma;
3037
3038         comma = 0;
3039         if (t_flags2 & TF2_PLPMTU_BLACKHOLE) {
3040                 db_printf("%sTF2_PLPMTU_BLACKHOLE", comma ? ", " : "");
3041                 comma = 1;
3042         }
3043         if (t_flags2 & TF2_PLPMTU_PMTUD) {
3044                 db_printf("%sTF2_PLPMTU_PMTUD", comma ? ", " : "");
3045                 comma = 1;
3046         }
3047         if (t_flags2 & TF2_PLPMTU_MAXSEGSNT) {
3048                 db_printf("%sTF2_PLPMTU_MAXSEGSNT", comma ? ", " : "");
3049                 comma = 1;
3050         }
3051         if (t_flags2 & TF2_LOG_AUTO) {
3052                 db_printf("%sTF2_LOG_AUTO", comma ? ", " : "");
3053                 comma = 1;
3054         }
3055         if (t_flags2 & TF2_DROP_AF_DATA) {
3056                 db_printf("%sTF2_DROP_AF_DATA", comma ? ", " : "");
3057                 comma = 1;
3058         }
3059         if (t_flags2 & TF2_ECN_PERMIT) {
3060                 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
3061                 comma = 1;
3062         }
3063         if (t_flags2 & TF2_ECN_SND_CWR) {
3064                 db_printf("%sTF2_ECN_SND_CWR", comma ? ", " : "");
3065                 comma = 1;
3066         }
3067         if (t_flags2 & TF2_ECN_SND_ECE) {
3068                 db_printf("%sTF2_ECN_SND_ECE", comma ? ", " : "");
3069                 comma = 1;
3070         }
3071         if (t_flags2 & TF2_ACE_PERMIT) {
3072                 db_printf("%sTF2_ACE_PERMIT", comma ? ", " : "");
3073                 comma = 1;
3074         }
3075         if (t_flags2 & TF2_FBYTES_COMPLETE) {
3076                 db_printf("%sTF2_FBYTES_COMPLETE", comma ? ", " : "");
3077                 comma = 1;
3078         }
3079 }
3080
3081 static void
3082 db_print_toobflags(char t_oobflags)
3083 {
3084         int comma;
3085
3086         comma = 0;
3087         if (t_oobflags & TCPOOB_HAVEDATA) {
3088                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
3089                 comma = 1;
3090         }
3091         if (t_oobflags & TCPOOB_HADDATA) {
3092                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
3093                 comma = 1;
3094         }
3095 }
3096
3097 static void
3098 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
3099 {
3100
3101         db_print_indent(indent);
3102         db_printf("%s at %p\n", name, tp);
3103
3104         indent += 2;
3105
3106         db_print_indent(indent);
3107         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
3108            TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
3109
3110         db_print_indent(indent);
3111         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
3112             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
3113
3114         db_print_indent(indent);
3115         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
3116             &tp->t_timers->tt_delack, tp->t_inpcb);
3117
3118         db_print_indent(indent);
3119         db_printf("t_state: %d (", tp->t_state);
3120         db_print_tstate(tp->t_state);
3121         db_printf(")\n");
3122
3123         db_print_indent(indent);
3124         db_printf("t_flags: 0x%x (", tp->t_flags);
3125         db_print_tflags(tp->t_flags);
3126         db_printf(")\n");
3127
3128         db_print_indent(indent);
3129         db_printf("t_flags2: 0x%x (", tp->t_flags2);
3130         db_print_tflags2(tp->t_flags2);
3131         db_printf(")\n");
3132
3133         db_print_indent(indent);
3134         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
3135             tp->snd_una, tp->snd_max, tp->snd_nxt);
3136
3137         db_print_indent(indent);
3138         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
3139            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
3140
3141         db_print_indent(indent);
3142         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
3143             tp->iss, tp->irs, tp->rcv_nxt);
3144
3145         db_print_indent(indent);
3146         db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
3147             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
3148
3149         db_print_indent(indent);
3150         db_printf("snd_wnd: %u   snd_cwnd: %u\n",
3151            tp->snd_wnd, tp->snd_cwnd);
3152
3153         db_print_indent(indent);
3154         db_printf("snd_ssthresh: %u   snd_recover: "
3155             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
3156
3157         db_print_indent(indent);
3158         db_printf("t_rcvtime: %u   t_startime: %u\n",
3159             tp->t_rcvtime, tp->t_starttime);
3160
3161         db_print_indent(indent);
3162         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
3163             tp->t_rtttime, tp->t_rtseq);
3164
3165         db_print_indent(indent);
3166         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
3167             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
3168
3169         db_print_indent(indent);
3170         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
3171             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
3172             tp->t_rttbest);
3173
3174         db_print_indent(indent);
3175         db_printf("t_rttupdated: %lu   max_sndwnd: %u   t_softerror: %d\n",
3176             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
3177
3178         db_print_indent(indent);
3179         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
3180         db_print_toobflags(tp->t_oobflags);
3181         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
3182
3183         db_print_indent(indent);
3184         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
3185             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
3186
3187         db_print_indent(indent);
3188         db_printf("ts_recent: %u   ts_recent_age: %u\n",
3189             tp->ts_recent, tp->ts_recent_age);
3190
3191         db_print_indent(indent);
3192         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
3193             "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
3194
3195         db_print_indent(indent);
3196         db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
3197             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
3198             tp->snd_recover_prev, tp->t_badrxtwin);
3199
3200         db_print_indent(indent);
3201         db_printf("snd_numholes: %d  snd_holes first: %p\n",
3202             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
3203
3204         db_print_indent(indent);
3205         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d\n",
3206             tp->snd_fack, tp->rcv_numsacks);
3207
3208         /* Skip sackblks, sackhint. */
3209
3210         db_print_indent(indent);
3211         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
3212             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
3213 }
3214
3215 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
3216 {
3217         struct tcpcb *tp;
3218
3219         if (!have_addr) {
3220                 db_printf("usage: show tcpcb <addr>\n");
3221                 return;
3222         }
3223         tp = (struct tcpcb *)addr;
3224
3225         db_print_tcpcb(tp, "tcpcb", 0);
3226 }
3227 #endif