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/syslog.h>
  70 #include <sys/stats.h>
  71
  72 #ifdef DDB
  73 #include <ddb/ddb.h>
  74 #endif
  75
  76 #include <net/if.h>
  77 #include <net/if_var.h>
  78 #include <net/route.h>
  79 #include <net/vnet.h>
  80
  81 #include <netinet/in.h>
  82 #include <netinet/in_kdtrace.h>
  83 #include <netinet/in_pcb.h>
  84 #include <netinet/in_systm.h>
  85 #include <netinet/in_var.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         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 208                 so->so_linger = TCP_LINGERTIME;
 209 out:
 210         TCPDEBUG2(PRU_ATTACH);
 211         TCP_PROBE2(debug__user, tp, PRU_ATTACH);
 212         return (error);
 213 }
 214
 215 /*
 216  * tcp_usr_detach is called when the socket layer loses its final reference
 217  * to the socket, be it a file descriptor reference, a reference from TCP,
 218  * etc.  At this point, there is only one case in which we will keep around
 219  * inpcb state: time wait.
 220  */
 221 static void
 222 tcp_usr_detach(struct socket *so)
 223 {
 224         struct inpcb *inp;
 225         struct tcpcb *tp;
 226
 227         inp = sotoinpcb(so);
 228         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 229         INP_WLOCK(inp);
 230         KASSERT(so->so_pcb == inp && inp->inp_socket == so,
 231                 ("%s: socket %p inp %p mismatch", __func__, so, inp));
 232
 233         tp = intotcpcb(inp);
 234
 235         if (inp->inp_flags & INP_TIMEWAIT) {
 236                 /*
 237                  * There are two cases to handle: one in which the time wait
 238                  * state is being discarded (INP_DROPPED), and one in which
 239                  * this connection will remain in timewait.  In the former,
 240                  * it is time to discard all state (except tcptw, which has
 241                  * already been discarded by the timewait close code, which
 242                  * should be further up the call stack somewhere).  In the
 243                  * latter case, we detach from the socket, but leave the pcb
 244                  * present until timewait ends.
 245                  *
 246                  * XXXRW: Would it be cleaner to free the tcptw here?
 247                  *
 248                  * Astute question indeed, from twtcp perspective there are
 249                  * four cases to consider:
 250                  *
 251                  * #1 tcp_usr_detach is called at tcptw creation time by
 252                  *  tcp_twstart, then do not discard the newly created tcptw
 253                  *  and leave inpcb present until timewait ends
 254                  * #2 tcp_usr_detach is called at tcptw creation time by
 255                  *  tcp_twstart, but connection is local and tw will be
 256                  *  discarded immediately
 257                  * #3 tcp_usr_detach is called at timewait end (or reuse) by
 258                  *  tcp_twclose, then the tcptw has already been discarded
 259                  *  (or reused) and inpcb is freed here
 260                  * #4 tcp_usr_detach is called() after timewait ends (or reuse)
 261                  *  (e.g. by soclose), then tcptw has already been discarded
 262                  *  (or reused) and inpcb is freed here
 263                  *
 264                  *  In all three cases the tcptw should not be freed here.
 265                  */
 266                 if (inp->inp_flags & INP_DROPPED) {
 267                         in_pcbdetach(inp);
 268                         if (__predict_true(tp == NULL)) {
 269                                 in_pcbfree(inp);
 270                         } else {
 271                                 /*
 272                                  * This case should not happen as in TIMEWAIT
 273                                  * state the inp should not be destroyed before
 274                                  * its tcptw.  If INVARIANTS is defined, panic.
 275                                  */
 276 #ifdef INVARIANTS
 277                                 panic("%s: Panic before an inp double-free: "
 278                                     "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
 279                                     , __func__);
 280 #else
 281                                 log(LOG_ERR, "%s: Avoid an inp double-free: "
 282                                     "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
 283                                     , __func__);
 284 #endif
 285                                 INP_WUNLOCK(inp);
 286                         }
 287                 } else {
 288                         in_pcbdetach(inp);
 289                         INP_WUNLOCK(inp);
 290                 }
 291         } else {
 292                 /*
 293                  * If the connection is not in timewait, we consider two
 294                  * two conditions: one in which no further processing is
 295                  * necessary (dropped || embryonic), and one in which TCP is
 296                  * not yet done, but no longer requires the socket, so the
 297                  * pcb will persist for the time being.
 298                  *
 299                  * XXXRW: Does the second case still occur?
 300                  */
 301                 if (inp->inp_flags & INP_DROPPED ||
 302                     tp->t_state < TCPS_SYN_SENT) {
 303                         tcp_discardcb(tp);
 304                         in_pcbdetach(inp);
 305                         in_pcbfree(inp);
 306                 } else {
 307                         in_pcbdetach(inp);
 308                         INP_WUNLOCK(inp);
 309                 }
 310         }
 311 }
 312
 313 #ifdef INET
 314 /*
 315  * Give the socket an address.
 316  */
 317 static int
 318 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 319 {
 320         int error = 0;
 321         struct inpcb *inp;
 322         struct tcpcb *tp = NULL;
 323         struct sockaddr_in *sinp;
 324
 325         sinp = (struct sockaddr_in *)nam;
 326         if (nam->sa_len != sizeof (*sinp))
 327                 return (EINVAL);
 328         /*
 329          * Must check for multicast addresses and disallow binding
 330          * to them.
 331          */
 332         if (sinp->sin_family == AF_INET &&
 333             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 334                 return (EAFNOSUPPORT);
 335
 336         TCPDEBUG0;
 337         inp = sotoinpcb(so);
 338         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 339         INP_WLOCK(inp);
 340         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 341                 error = EINVAL;
 342                 goto out;
 343         }
 344         tp = intotcpcb(inp);
 345         TCPDEBUG1();
 346         INP_HASH_WLOCK(&V_tcbinfo);
 347         error = in_pcbbind(inp, nam, td->td_ucred);
 348         INP_HASH_WUNLOCK(&V_tcbinfo);
 349 out:
 350         TCPDEBUG2(PRU_BIND);
 351         TCP_PROBE2(debug__user, tp, PRU_BIND);
 352         INP_WUNLOCK(inp);
 353
 354         return (error);
 355 }
 356 #endif /* INET */
 357
 358 #ifdef INET6
 359 static int
 360 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 361 {
 362         int error = 0;
 363         struct inpcb *inp;
 364         struct tcpcb *tp = NULL;
 365         struct sockaddr_in6 *sin6;
 366         u_char vflagsav;
 367
 368         sin6 = (struct sockaddr_in6 *)nam;
 369         if (nam->sa_len != sizeof (*sin6))
 370                 return (EINVAL);
 371         /*
 372          * Must check for multicast addresses and disallow binding
 373          * to them.
 374          */
 375         if (sin6->sin6_family == AF_INET6 &&
 376             IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 377                 return (EAFNOSUPPORT);
 378
 379         TCPDEBUG0;
 380         inp = sotoinpcb(so);
 381         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 382         INP_WLOCK(inp);
 383         vflagsav = inp->inp_vflag;
 384         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 385                 error = EINVAL;
 386                 goto out;
 387         }
 388         tp = intotcpcb(inp);
 389         TCPDEBUG1();
 390         INP_HASH_WLOCK(&V_tcbinfo);
 391         inp->inp_vflag &= ~INP_IPV4;
 392         inp->inp_vflag |= INP_IPV6;
 393 #ifdef INET
 394         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 395                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 396                         inp->inp_vflag |= INP_IPV4;
 397                 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 398                         struct sockaddr_in sin;
 399
 400                         in6_sin6_2_sin(&sin, sin6);
 401                         if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 402                                 error = EAFNOSUPPORT;
 403                                 INP_HASH_WUNLOCK(&V_tcbinfo);
 404                                 goto out;
 405                         }
 406                         inp->inp_vflag |= INP_IPV4;
 407                         inp->inp_vflag &= ~INP_IPV6;
 408                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 409                             td->td_ucred);
 410                         INP_HASH_WUNLOCK(&V_tcbinfo);
 411                         goto out;
 412                 }
 413         }
 414 #endif
 415         error = in6_pcbbind(inp, nam, td->td_ucred);
 416         INP_HASH_WUNLOCK(&V_tcbinfo);
 417 out:
 418         if (error != 0)
 419                 inp->inp_vflag = vflagsav;
 420         TCPDEBUG2(PRU_BIND);
 421         TCP_PROBE2(debug__user, tp, PRU_BIND);
 422         INP_WUNLOCK(inp);
 423         return (error);
 424 }
 425 #endif /* INET6 */
 426
 427 #ifdef INET
 428 /*
 429  * Prepare to accept connections.
 430  */
 431 static int
 432 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 433 {
 434         int error = 0;
 435         struct inpcb *inp;
 436         struct tcpcb *tp = NULL;
 437
 438         TCPDEBUG0;
 439         inp = sotoinpcb(so);
 440         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 441         INP_WLOCK(inp);
 442         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 443                 error = EINVAL;
 444                 goto out;
 445         }
 446         tp = intotcpcb(inp);
 447         TCPDEBUG1();
 448         SOCK_LOCK(so);
 449         error = solisten_proto_check(so);
 450         INP_HASH_WLOCK(&V_tcbinfo);
 451         if (error == 0 && inp->inp_lport == 0)
 452                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 453         INP_HASH_WUNLOCK(&V_tcbinfo);
 454         if (error == 0) {
 455                 tcp_state_change(tp, TCPS_LISTEN);
 456                 solisten_proto(so, backlog);
 457 #ifdef TCP_OFFLOAD
 458                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 459                         tcp_offload_listen_start(tp);
 460 #endif
 461         }
 462         SOCK_UNLOCK(so);
 463
 464         if (IS_FASTOPEN(tp->t_flags))
 465                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 466
 467 out:
 468         TCPDEBUG2(PRU_LISTEN);
 469         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 470         INP_WUNLOCK(inp);
 471         return (error);
 472 }
 473 #endif /* INET */
 474
 475 #ifdef INET6
 476 static int
 477 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 478 {
 479         int error = 0;
 480         struct inpcb *inp;
 481         struct tcpcb *tp = NULL;
 482         u_char vflagsav;
 483
 484         TCPDEBUG0;
 485         inp = sotoinpcb(so);
 486         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 487         INP_WLOCK(inp);
 488         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 489                 error = EINVAL;
 490                 goto out;
 491         }
 492         vflagsav = inp->inp_vflag;
 493         tp = intotcpcb(inp);
 494         TCPDEBUG1();
 495         SOCK_LOCK(so);
 496         error = solisten_proto_check(so);
 497         INP_HASH_WLOCK(&V_tcbinfo);
 498         if (error == 0 && inp->inp_lport == 0) {
 499                 inp->inp_vflag &= ~INP_IPV4;
 500                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 501                         inp->inp_vflag |= INP_IPV4;
 502                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 503         }
 504         INP_HASH_WUNLOCK(&V_tcbinfo);
 505         if (error == 0) {
 506                 tcp_state_change(tp, TCPS_LISTEN);
 507                 solisten_proto(so, backlog);
 508 #ifdef TCP_OFFLOAD
 509                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 510                         tcp_offload_listen_start(tp);
 511 #endif
 512         }
 513         SOCK_UNLOCK(so);
 514
 515         if (IS_FASTOPEN(tp->t_flags))
 516                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 517
 518         if (error != 0)
 519                 inp->inp_vflag = vflagsav;
 520
 521 out:
 522         TCPDEBUG2(PRU_LISTEN);
 523         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 524         INP_WUNLOCK(inp);
 525         return (error);
 526 }
 527 #endif /* INET6 */
 528
 529 #ifdef INET
 530 /*
 531  * Initiate connection to peer.
 532  * Create a template for use in transmissions on this connection.
 533  * Enter SYN_SENT state, and mark socket as connecting.
 534  * Start keep-alive timer, and seed output sequence space.
 535  * Send initial segment on connection.
 536  */
 537 static int
 538 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 539 {
 540         struct epoch_tracker et;
 541         int error = 0;
 542         struct inpcb *inp;
 543         struct tcpcb *tp = NULL;
 544         struct sockaddr_in *sinp;
 545
 546         sinp = (struct sockaddr_in *)nam;
 547         if (nam->sa_len != sizeof (*sinp))
 548                 return (EINVAL);
 549         /*
 550          * Must disallow TCP ``connections'' to multicast addresses.
 551          */
 552         if (sinp->sin_family == AF_INET
 553             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 554                 return (EAFNOSUPPORT);
 555         if ((sinp->sin_family == AF_INET) &&
 556             ((ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) ||
 557              (sinp->sin_addr.s_addr == INADDR_ANY)))
 558                 return(EAFNOSUPPORT);
 559         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 560                 return (error);
 561
 562         TCPDEBUG0;
 563         inp = sotoinpcb(so);
 564         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 565         INP_WLOCK(inp);
 566         if (inp->inp_flags & INP_TIMEWAIT) {
 567                 error = EADDRINUSE;
 568                 goto out;
 569         }
 570         if (inp->inp_flags & INP_DROPPED) {
 571                 error = ECONNREFUSED;
 572                 goto out;
 573         }
 574         tp = intotcpcb(inp);
 575         TCPDEBUG1();
 576         NET_EPOCH_ENTER(et);
 577         if ((error = tcp_connect(tp, nam, td)) != 0)
 578                 goto out_in_epoch;
 579 #ifdef TCP_OFFLOAD
 580         if (registered_toedevs > 0 &&
 581             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 582             (error = tcp_offload_connect(so, nam)) == 0)
 583                 goto out_in_epoch;
 584 #endif
 585         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 586         error = tp->t_fb->tfb_tcp_output(tp);
 587 out_in_epoch:
 588         NET_EPOCH_EXIT(et);
 589 out:
 590         TCPDEBUG2(PRU_CONNECT);
 591         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 592         INP_WUNLOCK(inp);
 593         return (error);
 594 }
 595 #endif /* INET */
 596
 597 #ifdef INET6
 598 static int
 599 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 600 {
 601         struct epoch_tracker et;
 602         int error = 0;
 603         struct inpcb *inp;
 604         struct tcpcb *tp = NULL;
 605         struct sockaddr_in6 *sin6;
 606         u_int8_t incflagsav;
 607         u_char vflagsav;
 608
 609         TCPDEBUG0;
 610
 611         sin6 = (struct sockaddr_in6 *)nam;
 612         if (nam->sa_len != sizeof (*sin6))
 613                 return (EINVAL);
 614         /*
 615          * Must disallow TCP ``connections'' to multicast addresses.
 616          */
 617         if (sin6->sin6_family == AF_INET6
 618             && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 619                 return (EAFNOSUPPORT);
 620
 621         inp = sotoinpcb(so);
 622         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 623         INP_WLOCK(inp);
 624         vflagsav = inp->inp_vflag;
 625         incflagsav = inp->inp_inc.inc_flags;
 626         if (inp->inp_flags & INP_TIMEWAIT) {
 627                 error = EADDRINUSE;
 628                 goto out;
 629         }
 630         if (inp->inp_flags & INP_DROPPED) {
 631                 error = ECONNREFUSED;
 632                 goto out;
 633         }
 634         tp = intotcpcb(inp);
 635         TCPDEBUG1();
 636 #ifdef INET
 637         /*
 638          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 639          * therefore probably require the hash lock, which isn't held here.
 640          * Is this a significant problem?
 641          */
 642         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 643                 struct sockaddr_in sin;
 644
 645                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 646                         error = EINVAL;
 647                         goto out;
 648                 }
 649                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 650                         error = EAFNOSUPPORT;
 651                         goto out;
 652                 }
 653
 654                 in6_sin6_2_sin(&sin, sin6);
 655                 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 656                         error = EAFNOSUPPORT;
 657                         goto out;
 658                 }
 659                 if ((ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) ||
 660                     (sin.sin_addr.s_addr == INADDR_ANY)) {
 661                         error = EAFNOSUPPORT;
 662                         goto out;
 663                 }
 664                 if ((error = prison_remote_ip4(td->td_ucred,
 665                     &sin.sin_addr)) != 0)
 666                         goto out;
 667                 inp->inp_vflag |= INP_IPV4;
 668                 inp->inp_vflag &= ~INP_IPV6;
 669                 NET_EPOCH_ENTER(et);
 670                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 671                         goto out_in_epoch;
 672 #ifdef TCP_OFFLOAD
 673                 if (registered_toedevs > 0 &&
 674                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 675                     (error = tcp_offload_connect(so, nam)) == 0)
 676                         goto out_in_epoch;
 677 #endif
 678                 error = tp->t_fb->tfb_tcp_output(tp);
 679                 goto out_in_epoch;
 680         } else {
 681                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 682                         error = EAFNOSUPPORT;
 683                         goto out;
 684                 }
 685         }
 686 #endif
 687         if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
 688                 goto out;
 689         inp->inp_vflag &= ~INP_IPV4;
 690         inp->inp_vflag |= INP_IPV6;
 691         inp->inp_inc.inc_flags |= INC_ISIPV6;
 692         if ((error = tcp6_connect(tp, nam, td)) != 0)
 693                 goto out;
 694 #ifdef TCP_OFFLOAD
 695         if (registered_toedevs > 0 &&
 696             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 697             (error = tcp_offload_connect(so, nam)) == 0)
 698                 goto out;
 699 #endif
 700         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 701         NET_EPOCH_ENTER(et);
 702         error = tp->t_fb->tfb_tcp_output(tp);
 703 #ifdef INET
 704 out_in_epoch:
 705 #endif
 706         NET_EPOCH_EXIT(et);
 707 out:
 708         /*
 709          * If the implicit bind in the connect call fails, restore
 710          * the flags we modified.
 711          */
 712         if (error != 0 && inp->inp_lport == 0) {
 713                 inp->inp_vflag = vflagsav;
 714                 inp->inp_inc.inc_flags = incflagsav;
 715         }
 716
 717         TCPDEBUG2(PRU_CONNECT);
 718         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 719         INP_WUNLOCK(inp);
 720         return (error);
 721 }
 722 #endif /* INET6 */
 723
 724 /*
 725  * Initiate disconnect from peer.
 726  * If connection never passed embryonic stage, just drop;
 727  * else if don't need to let data drain, then can just drop anyways,
 728  * else have to begin TCP shutdown process: mark socket disconnecting,
 729  * drain unread data, state switch to reflect user close, and
 730  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 731  * when peer sends FIN and acks ours.
 732  *
 733  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 734  */
 735 static int
 736 tcp_usr_disconnect(struct socket *so)
 737 {
 738         struct inpcb *inp;
 739         struct tcpcb *tp = NULL;
 740         struct epoch_tracker et;
 741         int error = 0;
 742
 743         TCPDEBUG0;
 744         NET_EPOCH_ENTER(et);
 745         inp = sotoinpcb(so);
 746         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 747         INP_WLOCK(inp);
 748         if (inp->inp_flags & INP_TIMEWAIT)
 749                 goto out;
 750         if (inp->inp_flags & INP_DROPPED) {
 751                 error = ECONNRESET;
 752                 goto out;
 753         }
 754         tp = intotcpcb(inp);
 755         TCPDEBUG1();
 756         tcp_disconnect(tp);
 757 out:
 758         TCPDEBUG2(PRU_DISCONNECT);
 759         TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
 760         INP_WUNLOCK(inp);
 761         NET_EPOCH_EXIT(et);
 762         return (error);
 763 }
 764
 765 #ifdef INET
 766 /*
 767  * Accept a connection.  Essentially all the work is done at higher levels;
 768  * just return the address of the peer, storing through addr.
 769  */
 770 static int
 771 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 772 {
 773         int error = 0;
 774         struct inpcb *inp = NULL;
 775         struct tcpcb *tp = NULL;
 776         struct in_addr addr;
 777         in_port_t port = 0;
 778         TCPDEBUG0;
 779
 780         if (so->so_state & SS_ISDISCONNECTED)
 781                 return (ECONNABORTED);
 782
 783         inp = sotoinpcb(so);
 784         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 785         INP_WLOCK(inp);
 786         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 787                 error = ECONNABORTED;
 788                 goto out;
 789         }
 790         tp = intotcpcb(inp);
 791         TCPDEBUG1();
 792
 793         /*
 794          * We inline in_getpeeraddr and COMMON_END here, so that we can
 795          * copy the data of interest and defer the malloc until after we
 796          * release the lock.
 797          */
 798         port = inp->inp_fport;
 799         addr = inp->inp_faddr;
 800
 801 out:
 802         TCPDEBUG2(PRU_ACCEPT);
 803         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 804         INP_WUNLOCK(inp);
 805         if (error == 0)
 806                 *nam = in_sockaddr(port, &addr);
 807         return error;
 808 }
 809 #endif /* INET */
 810
 811 #ifdef INET6
 812 static int
 813 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 814 {
 815         struct inpcb *inp = NULL;
 816         int error = 0;
 817         struct tcpcb *tp = NULL;
 818         struct in_addr addr;
 819         struct in6_addr addr6;
 820         struct epoch_tracker et;
 821         in_port_t port = 0;
 822         int v4 = 0;
 823         TCPDEBUG0;
 824
 825         if (so->so_state & SS_ISDISCONNECTED)
 826                 return (ECONNABORTED);
 827
 828         inp = sotoinpcb(so);
 829         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 830         NET_EPOCH_ENTER(et);
 831         INP_WLOCK(inp);
 832         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 833                 error = ECONNABORTED;
 834                 goto out;
 835         }
 836         tp = intotcpcb(inp);
 837         TCPDEBUG1();
 838
 839         /*
 840          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 841          * copy the data of interest and defer the malloc until after we
 842          * release the lock.
 843          */
 844         if (inp->inp_vflag & INP_IPV4) {
 845                 v4 = 1;
 846                 port = inp->inp_fport;
 847                 addr = inp->inp_faddr;
 848         } else {
 849                 port = inp->inp_fport;
 850                 addr6 = inp->in6p_faddr;
 851         }
 852
 853 out:
 854         TCPDEBUG2(PRU_ACCEPT);
 855         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 856         INP_WUNLOCK(inp);
 857         NET_EPOCH_EXIT(et);
 858         if (error == 0) {
 859                 if (v4)
 860                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 861                 else
 862                         *nam = in6_sockaddr(port, &addr6);
 863         }
 864         return error;
 865 }
 866 #endif /* INET6 */
 867
 868 /*
 869  * Mark the connection as being incapable of further output.
 870  */
 871 static int
 872 tcp_usr_shutdown(struct socket *so)
 873 {
 874         int error = 0;
 875         struct inpcb *inp;
 876         struct tcpcb *tp = NULL;
 877         struct epoch_tracker et;
 878
 879         TCPDEBUG0;
 880         NET_EPOCH_ENTER(et);
 881         inp = sotoinpcb(so);
 882         KASSERT(inp != NULL, ("inp == NULL"));
 883         INP_WLOCK(inp);
 884         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 885                 error = ECONNRESET;
 886                 goto out;
 887         }
 888         tp = intotcpcb(inp);
 889         TCPDEBUG1();
 890         socantsendmore(so);
 891         tcp_usrclosed(tp);
 892         if (!(inp->inp_flags & INP_DROPPED))
 893                 error = tp->t_fb->tfb_tcp_output(tp);
 894
 895 out:
 896         TCPDEBUG2(PRU_SHUTDOWN);
 897         TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
 898         INP_WUNLOCK(inp);
 899         NET_EPOCH_EXIT(et);
 900
 901         return (error);
 902 }
 903
 904 /*
 905  * After a receive, possibly send window update to peer.
 906  */
 907 static int
 908 tcp_usr_rcvd(struct socket *so, int flags)
 909 {
 910         struct epoch_tracker et;
 911         struct inpcb *inp;
 912         struct tcpcb *tp = NULL;
 913         int error = 0;
 914
 915         TCPDEBUG0;
 916         inp = sotoinpcb(so);
 917         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 918         INP_WLOCK(inp);
 919         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 920                 error = ECONNRESET;
 921                 goto out;
 922         }
 923         tp = intotcpcb(inp);
 924         TCPDEBUG1();
 925         /*
 926          * For passively-created TFO connections, don't attempt a window
 927          * update while still in SYN_RECEIVED as this may trigger an early
 928          * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
 929          * application response data, or failing that, when the DELACK timer
 930          * expires.
 931          */
 932         if (IS_FASTOPEN(tp->t_flags) &&
 933             (tp->t_state == TCPS_SYN_RECEIVED))
 934                 goto out;
 935         NET_EPOCH_ENTER(et);
 936 #ifdef TCP_OFFLOAD
 937         if (tp->t_flags & TF_TOE)
 938                 tcp_offload_rcvd(tp);
 939         else
 940 #endif
 941         tp->t_fb->tfb_tcp_output(tp);
 942         NET_EPOCH_EXIT(et);
 943 out:
 944         TCPDEBUG2(PRU_RCVD);
 945         TCP_PROBE2(debug__user, tp, PRU_RCVD);
 946         INP_WUNLOCK(inp);
 947         return (error);
 948 }
 949
 950 /*
 951  * Do a send by putting data in output queue and updating urgent
 952  * marker if URG set.  Possibly send more data.  Unlike the other
 953  * pru_*() routines, the mbuf chains are our responsibility.  We
 954  * must either enqueue them or free them.  The other pru_* routines
 955  * generally are caller-frees.
 956  */
 957 static int
 958 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 959     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 960 {
 961         struct epoch_tracker et;
 962         int error = 0;
 963         struct inpcb *inp;
 964         struct tcpcb *tp = NULL;
 965 #ifdef INET
 966 #ifdef INET6
 967         struct sockaddr_in sin;
 968 #endif
 969         struct sockaddr_in *sinp;
 970 #endif
 971 #ifdef INET6
 972         int isipv6;
 973 #endif
 974         u_int8_t incflagsav;
 975         u_char vflagsav;
 976         bool restoreflags;
 977         TCPDEBUG0;
 978
 979         /*
 980          * We require the pcbinfo "read lock" if we will close the socket
 981          * as part of this call.
 982          */
 983         NET_EPOCH_ENTER(et);
 984         inp = sotoinpcb(so);
 985         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 986         INP_WLOCK(inp);
 987         vflagsav = inp->inp_vflag;
 988         incflagsav = inp->inp_inc.inc_flags;
 989         restoreflags = false;
 990         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 991                 if (control)
 992                         m_freem(control);
 993                 /*
 994                  * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible
 995                  * for freeing memory.
 996                  */
 997                 if (m && (flags & PRUS_NOTREADY) == 0)
 998                         m_freem(m);
 999                 error = ECONNRESET;
1000                 goto out;
1001         }
1002         tp = intotcpcb(inp);
1003         if (flags & PRUS_OOB) {
1004                 if ((error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) {
1005                         if (control)
1006                                 m_freem(control);
1007                         if (m && (flags & PRUS_NOTREADY) == 0)
1008                                 m_freem(m);
1009                         goto out;
1010                 }
1011         }
1012         TCPDEBUG1();
1013         if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
1014                 switch (nam->sa_family) {
1015 #ifdef INET
1016                 case AF_INET:
1017                         sinp = (struct sockaddr_in *)nam;
1018                         if (sinp->sin_len != sizeof(struct sockaddr_in)) {
1019                                 if (m)
1020                                         m_freem(m);
1021                                 error = EINVAL;
1022                                 goto out;
1023                         }
1024                         if ((inp->inp_vflag & INP_IPV6) != 0) {
1025                                 if (m)
1026                                         m_freem(m);
1027                                 error = EAFNOSUPPORT;
1028                                 goto out;
1029                         }
1030                         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
1031                                 if (m)
1032                                         m_freem(m);
1033                                 error = EAFNOSUPPORT;
1034                                 goto out;
1035                         }
1036                         if ((ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) ||
1037                             (sinp->sin_addr.s_addr == INADDR_ANY)) {
1038                                 if (m)
1039                                         m_freem(m);
1040                                 error = EAFNOSUPPORT;
1041                                 goto out;
1042                         }
1043                         if ((error = prison_remote_ip4(td->td_ucred,
1044                             &sinp->sin_addr))) {
1045                                 if (m)
1046                                         m_freem(m);
1047                                 goto out;
1048                         }
1049 #ifdef INET6
1050                         isipv6 = 0;
1051 #endif
1052                         break;
1053 #endif /* INET */
1054 #ifdef INET6
1055                 case AF_INET6:
1056                 {
1057                         struct sockaddr_in6 *sin6;
1058
1059                         sin6 = (struct sockaddr_in6 *)nam;
1060                         if (sin6->sin6_len != sizeof(*sin6)) {
1061                                 if (m)
1062                                         m_freem(m);
1063                                 error = EINVAL;
1064                                 goto out;
1065                         }
1066                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1067                                 if (m != NULL)
1068                                         m_freem(m);
1069                                 error = EAFNOSUPPORT;
1070                                 goto out;
1071                         }
1072                         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1073                                 if (m)
1074                                         m_freem(m);
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                                         if (m)
1083                                                 m_freem(m);
1084                                         goto out;
1085                                 }
1086                                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1087                                         error = EAFNOSUPPORT;
1088                                         if (m)
1089                                                 m_freem(m);
1090                                         goto out;
1091                                 }
1092                                 restoreflags = true;
1093                                 inp->inp_vflag &= ~INP_IPV6;
1094                                 sinp = &sin;
1095                                 in6_sin6_2_sin(sinp, sin6);
1096                                 if (IN_MULTICAST(
1097                                     ntohl(sinp->sin_addr.s_addr))) {
1098                                         error = EAFNOSUPPORT;
1099                                         if (m)
1100                                                 m_freem(m);
1101                                         goto out;
1102                                 }
1103                                 if ((error = prison_remote_ip4(td->td_ucred,
1104                                     &sinp->sin_addr))) {
1105                                         if (m)
1106                                                 m_freem(m);
1107                                         goto out;
1108                                 }
1109                                 isipv6 = 0;
1110 #else /* !INET */
1111                                 error = EAFNOSUPPORT;
1112                                 if (m)
1113                                         m_freem(m);
1114                                 goto out;
1115 #endif /* INET */
1116                         } else {
1117                                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1118                                         if (m)
1119                                                 m_freem(m);
1120                                         error = EAFNOSUPPORT;
1121                                         goto out;
1122                                 }
1123                                 restoreflags = true;
1124                                 inp->inp_vflag &= ~INP_IPV4;
1125                                 inp->inp_inc.inc_flags |= INC_ISIPV6;
1126                                 if ((error = prison_remote_ip6(td->td_ucred,
1127                                     &sin6->sin6_addr))) {
1128                                         if (m)
1129                                                 m_freem(m);
1130                                         goto out;
1131                                 }
1132                                 isipv6 = 1;
1133                         }
1134                         break;
1135                 }
1136 #endif /* INET6 */
1137                 default:
1138                         if (m)
1139                                 m_freem(m);
1140                         error = EAFNOSUPPORT;
1141                         goto out;
1142                 }
1143         }
1144         if (control) {
1145                 /* TCP doesn't do control messages (rights, creds, etc) */
1146                 if (control->m_len) {
1147                         m_freem(control);
1148                         if (m)
1149                                 m_freem(m);
1150                         error = EINVAL;
1151                         goto out;
1152                 }
1153                 m_freem(control);       /* empty control, just free it */
1154         }
1155         if (!(flags & PRUS_OOB)) {
1156                 sbappendstream(&so->so_snd, m, flags);
1157                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1158                         /*
1159                          * Do implied connect if not yet connected,
1160                          * initialize window to default value, and
1161                          * initialize maxseg using peer's cached MSS.
1162                          */
1163 #ifdef INET6
1164                         if (isipv6)
1165                                 error = tcp6_connect(tp, nam, td);
1166 #endif /* INET6 */
1167 #if defined(INET6) && defined(INET)
1168                         else
1169 #endif
1170 #ifdef INET
1171                                 error = tcp_connect(tp,
1172                                     (struct sockaddr *)sinp, td);
1173 #endif
1174                         /*
1175                          * The bind operation in tcp_connect succeeded. We
1176                          * no longer want to restore the flags if later
1177                          * operations fail.
1178                          */
1179                         if (error == 0 || inp->inp_lport != 0)
1180                                 restoreflags = false;
1181
1182                         if (error)
1183                                 goto out;
1184                         if (IS_FASTOPEN(tp->t_flags))
1185                                 tcp_fastopen_connect(tp);
1186                         else {
1187                                 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1188                                 tcp_mss(tp, -1);
1189                         }
1190                 }
1191                 if (flags & PRUS_EOF) {
1192                         /*
1193                          * Close the send side of the connection after
1194                          * the data is sent.
1195                          */
1196                         socantsendmore(so);
1197                         tcp_usrclosed(tp);
1198                 }
1199                 if (!(inp->inp_flags & INP_DROPPED) &&
1200                     !(flags & PRUS_NOTREADY)) {
1201                         if (flags & PRUS_MORETOCOME)
1202                                 tp->t_flags |= TF_MORETOCOME;
1203                         error = tp->t_fb->tfb_tcp_output(tp);
1204                         if (flags & PRUS_MORETOCOME)
1205                                 tp->t_flags &= ~TF_MORETOCOME;
1206                 }
1207         } else {
1208                 /*
1209                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1210                  */
1211                 SOCKBUF_LOCK(&so->so_snd);
1212                 if (sbspace(&so->so_snd) < -512) {
1213                         SOCKBUF_UNLOCK(&so->so_snd);
1214                         m_freem(m);
1215                         error = ENOBUFS;
1216                         goto out;
1217                 }
1218                 /*
1219                  * According to RFC961 (Assigned Protocols),
1220                  * the urgent pointer points to the last octet
1221                  * of urgent data.  We continue, however,
1222                  * to consider it to indicate the first octet
1223                  * of data past the urgent section.
1224                  * Otherwise, snd_up should be one lower.
1225                  */
1226                 sbappendstream_locked(&so->so_snd, m, flags);
1227                 SOCKBUF_UNLOCK(&so->so_snd);
1228                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1229                         /*
1230                          * Do implied connect if not yet connected,
1231                          * initialize window to default value, and
1232                          * initialize maxseg using peer's cached MSS.
1233                          */
1234
1235                         /*
1236                          * Not going to contemplate SYN|URG
1237                          */
1238                         if (IS_FASTOPEN(tp->t_flags))
1239                                 tp->t_flags &= ~TF_FASTOPEN;
1240 #ifdef INET6
1241                         if (isipv6)
1242                                 error = tcp6_connect(tp, nam, td);
1243 #endif /* INET6 */
1244 #if defined(INET6) && defined(INET)
1245                         else
1246 #endif
1247 #ifdef INET
1248                                 error = tcp_connect(tp,
1249                                     (struct sockaddr *)sinp, td);
1250 #endif
1251                         /*
1252                          * The bind operation in tcp_connect succeeded. We
1253                          * no longer want to restore the flags if later
1254                          * operations fail.
1255                          */
1256                         if (error == 0 || inp->inp_lport != 0)
1257                                 restoreflags = false;
1258
1259                         if (error)
1260                                 goto out;
1261                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
1262                         tcp_mss(tp, -1);
1263                 }
1264                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1265                 if (!(flags & PRUS_NOTREADY)) {
1266                         tp->t_flags |= TF_FORCEDATA;
1267                         error = tp->t_fb->tfb_tcp_output(tp);
1268                         tp->t_flags &= ~TF_FORCEDATA;
1269                 }
1270         }
1271         TCP_LOG_EVENT(tp, NULL,
1272             &inp->inp_socket->so_rcv,
1273             &inp->inp_socket->so_snd,
1274             TCP_LOG_USERSEND, error,
1275             0, NULL, false);
1276 out:
1277         /*
1278          * If the request was unsuccessful and we changed flags,
1279          * restore the original flags.
1280          */
1281         if (error != 0 && restoreflags) {
1282                 inp->inp_vflag = vflagsav;
1283                 inp->inp_inc.inc_flags = incflagsav;
1284         }
1285         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1286                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1287         TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1288                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1289         INP_WUNLOCK(inp);
1290         NET_EPOCH_EXIT(et);
1291         return (error);
1292 }
1293
1294 static int
1295 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1296 {
1297         struct epoch_tracker et;
1298         struct inpcb *inp;
1299         struct tcpcb *tp;
1300         int error;
1301
1302         inp = sotoinpcb(so);
1303         INP_WLOCK(inp);
1304         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1305                 INP_WUNLOCK(inp);
1306                 mb_free_notready(m, count);
1307                 return (ECONNRESET);
1308         }
1309         tp = intotcpcb(inp);
1310
1311         SOCKBUF_LOCK(&so->so_snd);
1312         error = sbready(&so->so_snd, m, count);
1313         SOCKBUF_UNLOCK(&so->so_snd);
1314         if (error == 0) {
1315                 NET_EPOCH_ENTER(et);
1316                 error = tp->t_fb->tfb_tcp_output(tp);
1317                 NET_EPOCH_EXIT(et);
1318         }
1319         INP_WUNLOCK(inp);
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)
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(struct socket *so, struct sockopt *sopt)
1718 {
1719         int     error;
1720         struct  inpcb *inp;
1721         struct  tcpcb *tp;
1722         struct tcp_function_block *blk;
1723         struct tcp_function_set fsn;
1724
1725         error = 0;
1726         inp = sotoinpcb(so);
1727         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1728         if (sopt->sopt_level != IPPROTO_TCP) {
1729 #ifdef INET6
1730                 if (inp->inp_vflag & INP_IPV6PROTO) {
1731                         error = ip6_ctloutput(so, sopt);
1732                         /*
1733                          * In case of the IPV6_USE_MIN_MTU socket option,
1734                          * the INC_IPV6MINMTU flag to announce a corresponding
1735                          * MSS during the initial handshake.
1736                          * If the TCP connection is not in the front states,
1737                          * just reduce the MSS being used.
1738                          * This avoids the sending of TCP segments which will
1739                          * be fragmented at the IPv6 layer.
1740                          */
1741                         if ((error == 0) &&
1742                             (sopt->sopt_dir == SOPT_SET) &&
1743                             (sopt->sopt_level == IPPROTO_IPV6) &&
1744                             (sopt->sopt_name == IPV6_USE_MIN_MTU)) {
1745                                 INP_WLOCK(inp);
1746                                 if ((inp->inp_flags &
1747                                     (INP_TIMEWAIT | INP_DROPPED))) {
1748                                         INP_WUNLOCK(inp);
1749                                         return (ECONNRESET);
1750                                 }
1751                                 inp->inp_inc.inc_flags |= INC_IPV6MINMTU;
1752                                 tp = intotcpcb(inp);
1753                                 if ((tp->t_state >= TCPS_SYN_SENT) &&
1754                                     (inp->inp_inc.inc_flags & INC_ISIPV6)) {
1755                                         struct ip6_pktopts *opt;
1756
1757                                         opt = inp->in6p_outputopts;
1758                                         if ((opt != NULL) &&
1759                                             (opt->ip6po_minmtu ==
1760                                             IP6PO_MINMTU_ALL)) {
1761                                                 if (tp->t_maxseg > TCP6_MSS) {
1762                                                         tp->t_maxseg = TCP6_MSS;
1763                                                 }
1764                                         }
1765                                 }
1766                                 INP_WUNLOCK(inp);
1767                         }
1768                 }
1769 #endif /* INET6 */
1770 #if defined(INET6) && defined(INET)
1771                 else
1772 #endif
1773 #ifdef INET
1774                 {
1775                         error = ip_ctloutput(so, sopt);
1776                 }
1777 #endif
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         tp = intotcpcb(inp);
1786         /*
1787          * Protect the TCP option TCP_FUNCTION_BLK so
1788          * that a sub-function can *never* overwrite this.
1789          */
1790         if ((sopt->sopt_dir == SOPT_SET) &&
1791             (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1792                 INP_WUNLOCK(inp);
1793                 error = sooptcopyin(sopt, &fsn, sizeof fsn,
1794                     sizeof fsn);
1795                 if (error)
1796                         return (error);
1797                 INP_WLOCK_RECHECK(inp);
1798                 blk = find_and_ref_tcp_functions(&fsn);
1799                 if (blk == NULL) {
1800                         INP_WUNLOCK(inp);
1801                         return (ENOENT);
1802                 }
1803                 if (tp->t_fb == blk) {
1804                         /* You already have this */
1805                         refcount_release(&blk->tfb_refcnt);
1806                         INP_WUNLOCK(inp);
1807                         return (0);
1808                 }
1809                 if (tp->t_state != TCPS_CLOSED) {
1810                         /*
1811                          * The user has advanced the state
1812                          * past the initial point, we may not
1813                          * be able to switch.
1814                          */
1815                         if (blk->tfb_tcp_handoff_ok != NULL) {
1816                                 /*
1817                                  * Does the stack provide a
1818                                  * query mechanism, if so it may
1819                                  * still be possible?
1820                                  */
1821                                 error = (*blk->tfb_tcp_handoff_ok)(tp);
1822                         } else
1823                                 error = EINVAL;
1824                         if (error) {
1825                                 refcount_release(&blk->tfb_refcnt);
1826                                 INP_WUNLOCK(inp);
1827                                 return(error);
1828                         }
1829                 }
1830                 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1831                         refcount_release(&blk->tfb_refcnt);
1832                         INP_WUNLOCK(inp);
1833                         return (ENOENT);
1834                 }
1835                 /*
1836                  * Release the old refcnt, the
1837                  * lookup acquired a ref on the
1838                  * new one already.
1839                  */
1840                 if (tp->t_fb->tfb_tcp_fb_fini) {
1841                         /*
1842                          * Tell the stack to cleanup with 0 i.e.
1843                          * the tcb is not going away.
1844                          */
1845                         (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1846                 }
1847 #ifdef TCPHPTS
1848                 /* Assure that we are not on any hpts */
1849                 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL);
1850 #endif
1851                 if (blk->tfb_tcp_fb_init) {
1852                         error = (*blk->tfb_tcp_fb_init)(tp);
1853                         if (error) {
1854                                 refcount_release(&blk->tfb_refcnt);
1855                                 if (tp->t_fb->tfb_tcp_fb_init) {
1856                                         if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0)  {
1857                                                 /* Fall back failed, drop the connection */
1858                                                 INP_WUNLOCK(inp);
1859                                                 soabort(so);
1860                                                 return(error);
1861                                         }
1862                                 }
1863                                 goto err_out;
1864                         }
1865                 }
1866                 refcount_release(&tp->t_fb->tfb_refcnt);
1867                 tp->t_fb = blk;
1868 #ifdef TCP_OFFLOAD
1869                 if (tp->t_flags & TF_TOE) {
1870                         tcp_offload_ctloutput(tp, sopt->sopt_dir,
1871                              sopt->sopt_name);
1872                 }
1873 #endif
1874 err_out:
1875                 INP_WUNLOCK(inp);
1876                 return (error);
1877         } else if ((sopt->sopt_dir == SOPT_GET) &&
1878             (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1879                 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name,
1880                     TCP_FUNCTION_NAME_LEN_MAX);
1881                 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1882                 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1883                 INP_WUNLOCK(inp);
1884                 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1885                 return (error);
1886         }
1887         /* Pass in the INP locked, called must unlock it */
1888         return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp));
1889 }
1890
1891 /*
1892  * If this assert becomes untrue, we need to change the size of the buf
1893  * variable in tcp_default_ctloutput().
1894  */
1895 #ifdef CTASSERT
1896 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1897 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1898 #endif
1899
1900 #ifdef KERN_TLS
1901 static int
1902 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
1903 {
1904         struct tls_enable_v0 tls_v0;
1905         int error;
1906
1907         if (sopt->sopt_valsize == sizeof(tls_v0)) {
1908                 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
1909                     sizeof(tls_v0));
1910                 if (error)
1911                         return (error);
1912                 memset(tls, 0, sizeof(*tls));
1913                 tls->cipher_key = tls_v0.cipher_key;
1914                 tls->iv = tls_v0.iv;
1915                 tls->auth_key = tls_v0.auth_key;
1916                 tls->cipher_algorithm = tls_v0.cipher_algorithm;
1917                 tls->cipher_key_len = tls_v0.cipher_key_len;
1918                 tls->iv_len = tls_v0.iv_len;
1919                 tls->auth_algorithm = tls_v0.auth_algorithm;
1920                 tls->auth_key_len = tls_v0.auth_key_len;
1921                 tls->flags = tls_v0.flags;
1922                 tls->tls_vmajor = tls_v0.tls_vmajor;
1923                 tls->tls_vminor = tls_v0.tls_vminor;
1924                 return (0);
1925         }
1926
1927         return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
1928 }
1929 #endif
1930
1931 int
1932 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
1933 {
1934         int     error, opt, optval;
1935         u_int   ui;
1936         struct  tcp_info ti;
1937 #ifdef KERN_TLS
1938         struct tls_enable tls;
1939 #endif
1940         struct cc_algo *algo;
1941         char    *pbuf, buf[TCP_LOG_ID_LEN];
1942 #ifdef STATS
1943         struct statsblob *sbp;
1944 #endif
1945         size_t  len;
1946
1947         /*
1948          * For TCP_CCALGOOPT forward the control to CC module, for both
1949          * SOPT_SET and SOPT_GET.
1950          */
1951         switch (sopt->sopt_name) {
1952         case TCP_CCALGOOPT:
1953                 INP_WUNLOCK(inp);
1954                 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
1955                         return (EINVAL);
1956                 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
1957                 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
1958                     sopt->sopt_valsize);
1959                 if (error) {
1960                         free(pbuf, M_TEMP);
1961                         return (error);
1962                 }
1963                 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
1964                 if (CC_ALGO(tp)->ctl_output != NULL)
1965                         error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
1966                 else
1967                         error = ENOENT;
1968                 INP_WUNLOCK(inp);
1969                 if (error == 0 && sopt->sopt_dir == SOPT_GET)
1970                         error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
1971                 free(pbuf, M_TEMP);
1972                 return (error);
1973         }
1974
1975         switch (sopt->sopt_dir) {
1976         case SOPT_SET:
1977                 switch (sopt->sopt_name) {
1978 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
1979                 case TCP_MD5SIG:
1980                         if (!TCPMD5_ENABLED()) {
1981                                 INP_WUNLOCK(inp);
1982                                 return (ENOPROTOOPT);
1983                         }
1984                         error = TCPMD5_PCBCTL(inp, sopt);
1985                         if (error)
1986                                 return (error);
1987                         goto unlock_and_done;
1988 #endif /* IPSEC */
1989
1990                 case TCP_NODELAY:
1991                 case TCP_NOOPT:
1992                         INP_WUNLOCK(inp);
1993                         error = sooptcopyin(sopt, &optval, sizeof optval,
1994                             sizeof optval);
1995                         if (error)
1996                                 return (error);
1997
1998                         INP_WLOCK_RECHECK(inp);
1999                         switch (sopt->sopt_name) {
2000                         case TCP_NODELAY:
2001                                 opt = TF_NODELAY;
2002                                 break;
2003                         case TCP_NOOPT:
2004                                 opt = TF_NOOPT;
2005                                 break;
2006                         default:
2007                                 opt = 0; /* dead code to fool gcc */
2008                                 break;
2009                         }
2010
2011                         if (optval)
2012                                 tp->t_flags |= opt;
2013                         else
2014                                 tp->t_flags &= ~opt;
2015 unlock_and_done:
2016 #ifdef TCP_OFFLOAD
2017                         if (tp->t_flags & TF_TOE) {
2018                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
2019                                     sopt->sopt_name);
2020                         }
2021 #endif
2022                         INP_WUNLOCK(inp);
2023                         break;
2024
2025                 case TCP_NOPUSH:
2026                         INP_WUNLOCK(inp);
2027                         error = sooptcopyin(sopt, &optval, sizeof optval,
2028                             sizeof optval);
2029                         if (error)
2030                                 return (error);
2031
2032                         INP_WLOCK_RECHECK(inp);
2033                         if (optval)
2034                                 tp->t_flags |= TF_NOPUSH;
2035                         else if (tp->t_flags & TF_NOPUSH) {
2036                                 tp->t_flags &= ~TF_NOPUSH;
2037                                 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2038                                         struct epoch_tracker et;
2039
2040                                         NET_EPOCH_ENTER(et);
2041                                         error = tp->t_fb->tfb_tcp_output(tp);
2042                                         NET_EPOCH_EXIT(et);
2043                                 }
2044                         }
2045                         goto unlock_and_done;
2046
2047                 case TCP_MAXSEG:
2048                         INP_WUNLOCK(inp);
2049                         error = sooptcopyin(sopt, &optval, sizeof optval,
2050                             sizeof optval);
2051                         if (error)
2052                                 return (error);
2053
2054                         INP_WLOCK_RECHECK(inp);
2055                         if (optval > 0 && optval <= tp->t_maxseg &&
2056                             optval + 40 >= V_tcp_minmss)
2057                                 tp->t_maxseg = optval;
2058                         else
2059                                 error = EINVAL;
2060                         goto unlock_and_done;
2061
2062                 case TCP_INFO:
2063                         INP_WUNLOCK(inp);
2064                         error = EINVAL;
2065                         break;
2066
2067                 case TCP_STATS:
2068                         INP_WUNLOCK(inp);
2069 #ifdef STATS
2070                         error = sooptcopyin(sopt, &optval, sizeof optval,
2071                             sizeof optval);
2072                         if (error)
2073                                 return (error);
2074
2075                         if (optval > 0)
2076                                 sbp = stats_blob_alloc(
2077                                     V_tcp_perconn_stats_dflt_tpl, 0);
2078                         else
2079                                 sbp = NULL;
2080
2081                         INP_WLOCK_RECHECK(inp);
2082                         if ((tp->t_stats != NULL && sbp == NULL) ||
2083                             (tp->t_stats == NULL && sbp != NULL)) {
2084                                 struct statsblob *t = tp->t_stats;
2085                                 tp->t_stats = sbp;
2086                                 sbp = t;
2087                         }
2088                         INP_WUNLOCK(inp);
2089
2090                         stats_blob_destroy(sbp);
2091 #else
2092                         return (EOPNOTSUPP);
2093 #endif /* !STATS */
2094                         break;
2095
2096                 case TCP_CONGESTION:
2097                         INP_WUNLOCK(inp);
2098                         error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
2099                         if (error)
2100                                 break;
2101                         buf[sopt->sopt_valsize] = '\0';
2102                         INP_WLOCK_RECHECK(inp);
2103                         CC_LIST_RLOCK();
2104                         STAILQ_FOREACH(algo, &cc_list, entries)
2105                                 if (strncmp(buf, algo->name,
2106                                     TCP_CA_NAME_MAX) == 0)
2107                                         break;
2108                         CC_LIST_RUNLOCK();
2109                         if (algo == NULL) {
2110                                 INP_WUNLOCK(inp);
2111                                 error = EINVAL;
2112                                 break;
2113                         }
2114                         /*
2115                          * We hold a write lock over the tcb so it's safe to
2116                          * do these things without ordering concerns.
2117                          */
2118                         if (CC_ALGO(tp)->cb_destroy != NULL)
2119                                 CC_ALGO(tp)->cb_destroy(tp->ccv);
2120                         CC_DATA(tp) = NULL;
2121                         CC_ALGO(tp) = algo;
2122                         /*
2123                          * If something goes pear shaped initialising the new
2124                          * algo, fall back to newreno (which does not
2125                          * require initialisation).
2126                          */
2127                         if (algo->cb_init != NULL &&
2128                             algo->cb_init(tp->ccv) != 0) {
2129                                 CC_ALGO(tp) = &newreno_cc_algo;
2130                                 /*
2131                                  * The only reason init should fail is
2132                                  * because of malloc.
2133                                  */
2134                                 error = ENOMEM;
2135                         }
2136                         INP_WUNLOCK(inp);
2137                         break;
2138
2139 #ifdef KERN_TLS
2140                 case TCP_TXTLS_ENABLE:
2141                         INP_WUNLOCK(inp);
2142                         error = copyin_tls_enable(sopt, &tls);
2143                         if (error)
2144                                 break;
2145                         error = ktls_enable_tx(so, &tls);
2146                         break;
2147                 case TCP_TXTLS_MODE:
2148                         INP_WUNLOCK(inp);
2149                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2150                         if (error)
2151                                 return (error);
2152
2153                         INP_WLOCK_RECHECK(inp);
2154                         error = ktls_set_tx_mode(so, ui);
2155                         INP_WUNLOCK(inp);
2156                         break;
2157                 case TCP_RXTLS_ENABLE:
2158                         INP_WUNLOCK(inp);
2159                         error = sooptcopyin(sopt, &tls, sizeof(tls),
2160                             sizeof(tls));
2161                         if (error)
2162                                 break;
2163                         error = ktls_enable_rx(so, &tls);
2164                         break;
2165 #endif
2166
2167                 case TCP_KEEPIDLE:
2168                 case TCP_KEEPINTVL:
2169                 case TCP_KEEPINIT:
2170                         INP_WUNLOCK(inp);
2171                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2172                         if (error)
2173                                 return (error);
2174
2175                         if (ui > (UINT_MAX / hz)) {
2176                                 error = EINVAL;
2177                                 break;
2178                         }
2179                         ui *= hz;
2180
2181                         INP_WLOCK_RECHECK(inp);
2182                         switch (sopt->sopt_name) {
2183                         case TCP_KEEPIDLE:
2184                                 tp->t_keepidle = ui;
2185                                 /*
2186                                  * XXX: better check current remaining
2187                                  * timeout and "merge" it with new value.
2188                                  */
2189                                 if ((tp->t_state > TCPS_LISTEN) &&
2190                                     (tp->t_state <= TCPS_CLOSING))
2191                                         tcp_timer_activate(tp, TT_KEEP,
2192                                             TP_KEEPIDLE(tp));
2193                                 break;
2194                         case TCP_KEEPINTVL:
2195                                 tp->t_keepintvl = ui;
2196                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2197                                     (TP_MAXIDLE(tp) > 0))
2198                                         tcp_timer_activate(tp, TT_2MSL,
2199                                             TP_MAXIDLE(tp));
2200                                 break;
2201                         case TCP_KEEPINIT:
2202                                 tp->t_keepinit = ui;
2203                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
2204                                     tp->t_state == TCPS_SYN_SENT)
2205                                         tcp_timer_activate(tp, TT_KEEP,
2206                                             TP_KEEPINIT(tp));
2207                                 break;
2208                         }
2209                         goto unlock_and_done;
2210
2211                 case TCP_KEEPCNT:
2212                         INP_WUNLOCK(inp);
2213                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2214                         if (error)
2215                                 return (error);
2216
2217                         INP_WLOCK_RECHECK(inp);
2218                         tp->t_keepcnt = ui;
2219                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2220                             (TP_MAXIDLE(tp) > 0))
2221                                 tcp_timer_activate(tp, TT_2MSL,
2222                                     TP_MAXIDLE(tp));
2223                         goto unlock_and_done;
2224
2225 #ifdef TCPPCAP
2226                 case TCP_PCAP_OUT:
2227                 case TCP_PCAP_IN:
2228                         INP_WUNLOCK(inp);
2229                         error = sooptcopyin(sopt, &optval, sizeof optval,
2230                             sizeof optval);
2231                         if (error)
2232                                 return (error);
2233
2234                         INP_WLOCK_RECHECK(inp);
2235                         if (optval >= 0)
2236                                 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2237                                         &(tp->t_outpkts) : &(tp->t_inpkts),
2238                                         optval);
2239                         else
2240                                 error = EINVAL;
2241                         goto unlock_and_done;
2242 #endif
2243
2244                 case TCP_FASTOPEN: {
2245                         struct tcp_fastopen tfo_optval;
2246
2247                         INP_WUNLOCK(inp);
2248                         if (!V_tcp_fastopen_client_enable &&
2249                             !V_tcp_fastopen_server_enable)
2250                                 return (EPERM);
2251
2252                         error = sooptcopyin(sopt, &tfo_optval,
2253                                     sizeof(tfo_optval), sizeof(int));
2254                         if (error)
2255                                 return (error);
2256
2257                         INP_WLOCK_RECHECK(inp);
2258                         if ((tp->t_state != TCPS_CLOSED) &&
2259                             (tp->t_state != TCPS_LISTEN)) {
2260                                 error = EINVAL;
2261                                 goto unlock_and_done;
2262                         }
2263                         if (tfo_optval.enable) {
2264                                 if (tp->t_state == TCPS_LISTEN) {
2265                                         if (!V_tcp_fastopen_server_enable) {
2266                                                 error = EPERM;
2267                                                 goto unlock_and_done;
2268                                         }
2269
2270                                         if (tp->t_tfo_pending == NULL)
2271                                                 tp->t_tfo_pending =
2272                                                     tcp_fastopen_alloc_counter();
2273                                 } else {
2274                                         /*
2275                                          * If a pre-shared key was provided,
2276                                          * stash it in the client cookie
2277                                          * field of the tcpcb for use during
2278                                          * connect.
2279                                          */
2280                                         if (sopt->sopt_valsize ==
2281                                             sizeof(tfo_optval)) {
2282                                                 memcpy(tp->t_tfo_cookie.client,
2283                                                        tfo_optval.psk,
2284                                                        TCP_FASTOPEN_PSK_LEN);
2285                                                 tp->t_tfo_client_cookie_len =
2286                                                     TCP_FASTOPEN_PSK_LEN;
2287                                         }
2288                                 }
2289                                 tp->t_flags |= TF_FASTOPEN;
2290                         } else
2291                                 tp->t_flags &= ~TF_FASTOPEN;
2292                         goto unlock_and_done;
2293                 }
2294
2295 #ifdef TCP_BLACKBOX
2296                 case TCP_LOG:
2297                         INP_WUNLOCK(inp);
2298                         error = sooptcopyin(sopt, &optval, sizeof optval,
2299                             sizeof optval);
2300                         if (error)
2301                                 return (error);
2302
2303                         INP_WLOCK_RECHECK(inp);
2304                         error = tcp_log_state_change(tp, optval);
2305                         goto unlock_and_done;
2306
2307                 case TCP_LOGBUF:
2308                         INP_WUNLOCK(inp);
2309                         error = EINVAL;
2310                         break;
2311
2312                 case TCP_LOGID:
2313                         INP_WUNLOCK(inp);
2314                         error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2315                         if (error)
2316                                 break;
2317                         buf[sopt->sopt_valsize] = '\0';
2318                         INP_WLOCK_RECHECK(inp);
2319                         error = tcp_log_set_id(tp, buf);
2320                         /* tcp_log_set_id() unlocks the INP. */
2321                         break;
2322
2323                 case TCP_LOGDUMP:
2324                 case TCP_LOGDUMPID:
2325                         INP_WUNLOCK(inp);
2326                         error =
2327                             sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2328                         if (error)
2329                                 break;
2330                         buf[sopt->sopt_valsize] = '\0';
2331                         INP_WLOCK_RECHECK(inp);
2332                         if (sopt->sopt_name == TCP_LOGDUMP) {
2333                                 error = tcp_log_dump_tp_logbuf(tp, buf,
2334                                     M_WAITOK, true);
2335                                 INP_WUNLOCK(inp);
2336                         } else {
2337                                 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2338                                 /*
2339                                  * tcp_log_dump_tp_bucket_logbufs() drops the
2340                                  * INP lock.
2341                                  */
2342                         }
2343                         break;
2344 #endif
2345
2346                 default:
2347                         INP_WUNLOCK(inp);
2348                         error = ENOPROTOOPT;
2349                         break;
2350                 }
2351                 break;
2352
2353         case SOPT_GET:
2354                 tp = intotcpcb(inp);
2355                 switch (sopt->sopt_name) {
2356 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2357                 case TCP_MD5SIG:
2358                         if (!TCPMD5_ENABLED()) {
2359                                 INP_WUNLOCK(inp);
2360                                 return (ENOPROTOOPT);
2361                         }
2362                         error = TCPMD5_PCBCTL(inp, sopt);
2363                         break;
2364 #endif
2365
2366                 case TCP_NODELAY:
2367                         optval = tp->t_flags & TF_NODELAY;
2368                         INP_WUNLOCK(inp);
2369                         error = sooptcopyout(sopt, &optval, sizeof optval);
2370                         break;
2371                 case TCP_MAXSEG:
2372                         optval = tp->t_maxseg;
2373                         INP_WUNLOCK(inp);
2374                         error = sooptcopyout(sopt, &optval, sizeof optval);
2375                         break;
2376                 case TCP_NOOPT:
2377                         optval = tp->t_flags & TF_NOOPT;
2378                         INP_WUNLOCK(inp);
2379                         error = sooptcopyout(sopt, &optval, sizeof optval);
2380                         break;
2381                 case TCP_NOPUSH:
2382                         optval = tp->t_flags & TF_NOPUSH;
2383                         INP_WUNLOCK(inp);
2384                         error = sooptcopyout(sopt, &optval, sizeof optval);
2385                         break;
2386                 case TCP_INFO:
2387                         tcp_fill_info(tp, &ti);
2388                         INP_WUNLOCK(inp);
2389                         error = sooptcopyout(sopt, &ti, sizeof ti);
2390                         break;
2391                 case TCP_STATS:
2392                         {
2393 #ifdef STATS
2394                         int nheld;
2395                         TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2396
2397                         error = 0;
2398                         socklen_t outsbsz = sopt->sopt_valsize;
2399                         if (tp->t_stats == NULL)
2400                                 error = ENOENT;
2401                         else if (outsbsz >= tp->t_stats->cursz)
2402                                 outsbsz = tp->t_stats->cursz;
2403                         else if (outsbsz >= sizeof(struct statsblob))
2404                                 outsbsz = sizeof(struct statsblob);
2405                         else
2406                                 error = EINVAL;
2407                         INP_WUNLOCK(inp);
2408                         if (error)
2409                                 break;
2410
2411                         sbp = sopt->sopt_val;
2412                         nheld = atop(round_page(((vm_offset_t)sbp) +
2413                             (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2414                         vm_page_t ma[nheld];
2415                         if (vm_fault_quick_hold_pages(
2416                             &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2417                             outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2418                             nheld) < 0) {
2419                                 error = EFAULT;
2420                                 break;
2421                         }
2422
2423                         if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2424                             SIZEOF_MEMBER(struct statsblob, flags))))
2425                                 goto unhold;
2426
2427                         INP_WLOCK_RECHECK(inp);
2428                         error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2429                             sbflags | SB_CLONE_USRDSTNOFAULT);
2430                         INP_WUNLOCK(inp);
2431                         sopt->sopt_valsize = outsbsz;
2432 unhold:
2433                         vm_page_unhold_pages(ma, nheld);
2434 #else
2435                         INP_WUNLOCK(inp);
2436                         error = EOPNOTSUPP;
2437 #endif /* !STATS */
2438                         break;
2439                         }
2440                 case TCP_CONGESTION:
2441                         len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2442                         INP_WUNLOCK(inp);
2443                         error = sooptcopyout(sopt, buf, len + 1);
2444                         break;
2445                 case TCP_KEEPIDLE:
2446                 case TCP_KEEPINTVL:
2447                 case TCP_KEEPINIT:
2448                 case TCP_KEEPCNT:
2449                         switch (sopt->sopt_name) {
2450                         case TCP_KEEPIDLE:
2451                                 ui = TP_KEEPIDLE(tp) / hz;
2452                                 break;
2453                         case TCP_KEEPINTVL:
2454                                 ui = TP_KEEPINTVL(tp) / hz;
2455                                 break;
2456                         case TCP_KEEPINIT:
2457                                 ui = TP_KEEPINIT(tp) / hz;
2458                                 break;
2459                         case TCP_KEEPCNT:
2460                                 ui = TP_KEEPCNT(tp);
2461                                 break;
2462                         }
2463                         INP_WUNLOCK(inp);
2464                         error = sooptcopyout(sopt, &ui, sizeof(ui));
2465                         break;
2466 #ifdef TCPPCAP
2467                 case TCP_PCAP_OUT:
2468                 case TCP_PCAP_IN:
2469                         optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2470                                         &(tp->t_outpkts) : &(tp->t_inpkts));
2471                         INP_WUNLOCK(inp);
2472                         error = sooptcopyout(sopt, &optval, sizeof optval);
2473                         break;
2474 #endif
2475                 case TCP_FASTOPEN:
2476                         optval = tp->t_flags & TF_FASTOPEN;
2477                         INP_WUNLOCK(inp);
2478                         error = sooptcopyout(sopt, &optval, sizeof optval);
2479                         break;
2480 #ifdef TCP_BLACKBOX
2481                 case TCP_LOG:
2482                         optval = tp->t_logstate;
2483                         INP_WUNLOCK(inp);
2484                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2485                         break;
2486                 case TCP_LOGBUF:
2487                         /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2488                         error = tcp_log_getlogbuf(sopt, tp);
2489                         break;
2490                 case TCP_LOGID:
2491                         len = tcp_log_get_id(tp, buf);
2492                         INP_WUNLOCK(inp);
2493                         error = sooptcopyout(sopt, buf, len + 1);
2494                         break;
2495                 case TCP_LOGDUMP:
2496                 case TCP_LOGDUMPID:
2497                         INP_WUNLOCK(inp);
2498                         error = EINVAL;
2499                         break;
2500 #endif
2501 #ifdef KERN_TLS
2502                 case TCP_TXTLS_MODE:
2503                         optval = ktls_get_tx_mode(so);
2504                         INP_WUNLOCK(inp);
2505                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2506                         break;
2507                 case TCP_RXTLS_MODE:
2508                         optval = ktls_get_rx_mode(so);
2509                         INP_WUNLOCK(inp);
2510                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2511                         break;
2512 #endif
2513                 default:
2514                         INP_WUNLOCK(inp);
2515                         error = ENOPROTOOPT;
2516                         break;
2517                 }
2518                 break;
2519         }
2520         return (error);
2521 }
2522 #undef INP_WLOCK_RECHECK
2523 #undef INP_WLOCK_RECHECK_CLEANUP
2524
2525 /*
2526  * Initiate (or continue) disconnect.
2527  * If embryonic state, just send reset (once).
2528  * If in ``let data drain'' option and linger null, just drop.
2529  * Otherwise (hard), mark socket disconnecting and drop
2530  * current input data; switch states based on user close, and
2531  * send segment to peer (with FIN).
2532  */
2533 static void
2534 tcp_disconnect(struct tcpcb *tp)
2535 {
2536         struct inpcb *inp = tp->t_inpcb;
2537         struct socket *so = inp->inp_socket;
2538
2539         NET_EPOCH_ASSERT();
2540         INP_WLOCK_ASSERT(inp);
2541
2542         /*
2543          * Neither tcp_close() nor tcp_drop() should return NULL, as the
2544          * socket is still open.
2545          */
2546         if (tp->t_state < TCPS_ESTABLISHED &&
2547             !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2548                 tp = tcp_close(tp);
2549                 KASSERT(tp != NULL,
2550                     ("tcp_disconnect: tcp_close() returned NULL"));
2551         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2552                 tp = tcp_drop(tp, 0);
2553                 KASSERT(tp != NULL,
2554                     ("tcp_disconnect: tcp_drop() returned NULL"));
2555         } else {
2556                 soisdisconnecting(so);
2557                 sbflush(&so->so_rcv);
2558                 tcp_usrclosed(tp);
2559                 if (!(inp->inp_flags & INP_DROPPED))
2560                         tp->t_fb->tfb_tcp_output(tp);
2561         }
2562 }
2563
2564 /*
2565  * User issued close, and wish to trail through shutdown states:
2566  * if never received SYN, just forget it.  If got a SYN from peer,
2567  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2568  * If already got a FIN from peer, then almost done; go to LAST_ACK
2569  * state.  In all other cases, have already sent FIN to peer (e.g.
2570  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2571  * for peer to send FIN or not respond to keep-alives, etc.
2572  * We can let the user exit from the close as soon as the FIN is acked.
2573  */
2574 static void
2575 tcp_usrclosed(struct tcpcb *tp)
2576 {
2577
2578         NET_EPOCH_ASSERT();
2579         INP_WLOCK_ASSERT(tp->t_inpcb);
2580
2581         switch (tp->t_state) {
2582         case TCPS_LISTEN:
2583 #ifdef TCP_OFFLOAD
2584                 tcp_offload_listen_stop(tp);
2585 #endif
2586                 tcp_state_change(tp, TCPS_CLOSED);
2587                 /* FALLTHROUGH */
2588         case TCPS_CLOSED:
2589                 tp = tcp_close(tp);
2590                 /*
2591                  * tcp_close() should never return NULL here as the socket is
2592                  * still open.
2593                  */
2594                 KASSERT(tp != NULL,
2595                     ("tcp_usrclosed: tcp_close() returned NULL"));
2596                 break;
2597
2598         case TCPS_SYN_SENT:
2599         case TCPS_SYN_RECEIVED:
2600                 tp->t_flags |= TF_NEEDFIN;
2601                 break;
2602
2603         case TCPS_ESTABLISHED:
2604                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2605                 break;
2606
2607         case TCPS_CLOSE_WAIT:
2608                 tcp_state_change(tp, TCPS_LAST_ACK);
2609                 break;
2610         }
2611         if (tp->t_state >= TCPS_FIN_WAIT_2) {
2612                 soisdisconnected(tp->t_inpcb->inp_socket);
2613                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2614                 if (tp->t_state == TCPS_FIN_WAIT_2) {
2615                         int timeout;
2616
2617                         timeout = (tcp_fast_finwait2_recycle) ?
2618                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
2619                         tcp_timer_activate(tp, TT_2MSL, timeout);
2620                 }
2621         }
2622 }
2623
2624 #ifdef DDB
2625 static void
2626 db_print_indent(int indent)
2627 {
2628         int i;
2629
2630         for (i = 0; i < indent; i++)
2631                 db_printf(" ");
2632 }
2633
2634 static void
2635 db_print_tstate(int t_state)
2636 {
2637
2638         switch (t_state) {
2639         case TCPS_CLOSED:
2640                 db_printf("TCPS_CLOSED");
2641                 return;
2642
2643         case TCPS_LISTEN:
2644                 db_printf("TCPS_LISTEN");
2645                 return;
2646
2647         case TCPS_SYN_SENT:
2648                 db_printf("TCPS_SYN_SENT");
2649                 return;
2650
2651         case TCPS_SYN_RECEIVED:
2652                 db_printf("TCPS_SYN_RECEIVED");
2653                 return;
2654
2655         case TCPS_ESTABLISHED:
2656                 db_printf("TCPS_ESTABLISHED");
2657                 return;
2658
2659         case TCPS_CLOSE_WAIT:
2660                 db_printf("TCPS_CLOSE_WAIT");
2661                 return;
2662
2663         case TCPS_FIN_WAIT_1:
2664                 db_printf("TCPS_FIN_WAIT_1");
2665                 return;
2666
2667         case TCPS_CLOSING:
2668                 db_printf("TCPS_CLOSING");
2669                 return;
2670
2671         case TCPS_LAST_ACK:
2672                 db_printf("TCPS_LAST_ACK");
2673                 return;
2674
2675         case TCPS_FIN_WAIT_2:
2676                 db_printf("TCPS_FIN_WAIT_2");
2677                 return;
2678
2679         case TCPS_TIME_WAIT:
2680                 db_printf("TCPS_TIME_WAIT");
2681                 return;
2682
2683         default:
2684                 db_printf("unknown");
2685                 return;
2686         }
2687 }
2688
2689 static void
2690 db_print_tflags(u_int t_flags)
2691 {
2692         int comma;
2693
2694         comma = 0;
2695         if (t_flags & TF_ACKNOW) {
2696                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2697                 comma = 1;
2698         }
2699         if (t_flags & TF_DELACK) {
2700                 db_printf("%sTF_DELACK", comma ? ", " : "");
2701                 comma = 1;
2702         }
2703         if (t_flags & TF_NODELAY) {
2704                 db_printf("%sTF_NODELAY", comma ? ", " : "");
2705                 comma = 1;
2706         }
2707         if (t_flags & TF_NOOPT) {
2708                 db_printf("%sTF_NOOPT", comma ? ", " : "");
2709                 comma = 1;
2710         }
2711         if (t_flags & TF_SENTFIN) {
2712                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2713                 comma = 1;
2714         }
2715         if (t_flags & TF_REQ_SCALE) {
2716                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2717                 comma = 1;
2718         }
2719         if (t_flags & TF_RCVD_SCALE) {
2720                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2721                 comma = 1;
2722         }
2723         if (t_flags & TF_REQ_TSTMP) {
2724                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2725                 comma = 1;
2726         }
2727         if (t_flags & TF_RCVD_TSTMP) {
2728                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2729                 comma = 1;
2730         }
2731         if (t_flags & TF_SACK_PERMIT) {
2732                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2733                 comma = 1;
2734         }
2735         if (t_flags & TF_NEEDSYN) {
2736                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2737                 comma = 1;
2738         }
2739         if (t_flags & TF_NEEDFIN) {
2740                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2741                 comma = 1;
2742         }
2743         if (t_flags & TF_NOPUSH) {
2744                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2745                 comma = 1;
2746         }
2747         if (t_flags & TF_MORETOCOME) {
2748                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2749                 comma = 1;
2750         }
2751         if (t_flags & TF_LQ_OVERFLOW) {
2752                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2753                 comma = 1;
2754         }
2755         if (t_flags & TF_LASTIDLE) {
2756                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2757                 comma = 1;
2758         }
2759         if (t_flags & TF_RXWIN0SENT) {
2760                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2761                 comma = 1;
2762         }
2763         if (t_flags & TF_FASTRECOVERY) {
2764                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2765                 comma = 1;
2766         }
2767         if (t_flags & TF_CONGRECOVERY) {
2768                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2769                 comma = 1;
2770         }
2771         if (t_flags & TF_WASFRECOVERY) {
2772                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2773                 comma = 1;
2774         }
2775         if (t_flags & TF_SIGNATURE) {
2776                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2777                 comma = 1;
2778         }
2779         if (t_flags & TF_FORCEDATA) {
2780                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2781                 comma = 1;
2782         }
2783         if (t_flags & TF_TSO) {
2784                 db_printf("%sTF_TSO", comma ? ", " : "");
2785                 comma = 1;
2786         }
2787         if (t_flags & TF_FASTOPEN) {
2788                 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2789                 comma = 1;
2790         }
2791 }
2792
2793 static void
2794 db_print_tflags2(u_int t_flags2)
2795 {
2796         int comma;
2797
2798         comma = 0;
2799         if (t_flags2 & TF2_ECN_PERMIT) {
2800                 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
2801                 comma = 1;
2802         }
2803 }
2804
2805
2806 static void
2807 db_print_toobflags(char t_oobflags)
2808 {
2809         int comma;
2810
2811         comma = 0;
2812         if (t_oobflags & TCPOOB_HAVEDATA) {
2813                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
2814                 comma = 1;
2815         }
2816         if (t_oobflags & TCPOOB_HADDATA) {
2817                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
2818                 comma = 1;
2819         }
2820 }
2821
2822 static void
2823 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
2824 {
2825
2826         db_print_indent(indent);
2827         db_printf("%s at %p\n", name, tp);
2828
2829         indent += 2;
2830
2831         db_print_indent(indent);
2832         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
2833            TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
2834
2835         db_print_indent(indent);
2836         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
2837             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
2838
2839         db_print_indent(indent);
2840         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
2841             &tp->t_timers->tt_delack, tp->t_inpcb);
2842
2843         db_print_indent(indent);
2844         db_printf("t_state: %d (", tp->t_state);
2845         db_print_tstate(tp->t_state);
2846         db_printf(")\n");
2847
2848         db_print_indent(indent);
2849         db_printf("t_flags: 0x%x (", tp->t_flags);
2850         db_print_tflags(tp->t_flags);
2851         db_printf(")\n");
2852
2853         db_print_indent(indent);
2854         db_printf("t_flags2: 0x%x (", tp->t_flags2);
2855         db_print_tflags2(tp->t_flags2);
2856         db_printf(")\n");
2857
2858         db_print_indent(indent);
2859         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
2860             tp->snd_una, tp->snd_max, tp->snd_nxt);
2861
2862         db_print_indent(indent);
2863         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
2864            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
2865
2866         db_print_indent(indent);
2867         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
2868             tp->iss, tp->irs, tp->rcv_nxt);
2869
2870         db_print_indent(indent);
2871         db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
2872             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
2873
2874         db_print_indent(indent);
2875         db_printf("snd_wnd: %u   snd_cwnd: %u\n",
2876            tp->snd_wnd, tp->snd_cwnd);
2877
2878         db_print_indent(indent);
2879         db_printf("snd_ssthresh: %u   snd_recover: "
2880             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
2881
2882         db_print_indent(indent);
2883         db_printf("t_rcvtime: %u   t_startime: %u\n",
2884             tp->t_rcvtime, tp->t_starttime);
2885
2886         db_print_indent(indent);
2887         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
2888             tp->t_rtttime, tp->t_rtseq);
2889
2890         db_print_indent(indent);
2891         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
2892             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
2893
2894         db_print_indent(indent);
2895         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
2896             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
2897             tp->t_rttbest);
2898
2899         db_print_indent(indent);
2900         db_printf("t_rttupdated: %lu   max_sndwnd: %u   t_softerror: %d\n",
2901             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2902
2903         db_print_indent(indent);
2904         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2905         db_print_toobflags(tp->t_oobflags);
2906         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
2907
2908         db_print_indent(indent);
2909         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
2910             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2911
2912         db_print_indent(indent);
2913         db_printf("ts_recent: %u   ts_recent_age: %u\n",
2914             tp->ts_recent, tp->ts_recent_age);
2915
2916         db_print_indent(indent);
2917         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
2918             "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2919
2920         db_print_indent(indent);
2921         db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
2922             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2923             tp->snd_recover_prev, tp->t_badrxtwin);
2924
2925         db_print_indent(indent);
2926         db_printf("snd_numholes: %d  snd_holes first: %p\n",
2927             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2928
2929         db_print_indent(indent);
2930         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d\n",
2931             tp->snd_fack, tp->rcv_numsacks);
2932
2933         /* Skip sackblks, sackhint. */
2934
2935         db_print_indent(indent);
2936         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
2937             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2938 }
2939
2940 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2941 {
2942         struct tcpcb *tp;
2943
2944         if (!have_addr) {
2945                 db_printf("usage: show tcpcb <addr>\n");
2946                 return;
2947         }
2948         tp = (struct tcpcb *)addr;
2949
2950         db_print_tcpcb(tp, "tcpcb", 0);
2951 }
2952 #endif