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