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 attaches to socket via pru_attach(), reserving space,
 151  * and an internet control block.
 152  */
 153 static int
 154 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 155 {
 156         struct inpcb *inp;
 157         struct tcpcb *tp = NULL;
 158         int error;
 159         TCPDEBUG0;
 160
 161         inp = sotoinpcb(so);
 162         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 163         TCPDEBUG1();
 164
 165         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 166                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
 167                 if (error)
 168                         goto out;
 169         }
 170
 171         so->so_rcv.sb_flags |= SB_AUTOSIZE;
 172         so->so_snd.sb_flags |= SB_AUTOSIZE;
 173         error = in_pcballoc(so, &V_tcbinfo);
 174         if (error)
 175                 goto out;
 176         inp = sotoinpcb(so);
 177 #ifdef INET6
 178         if (inp->inp_vflag & INP_IPV6PROTO) {
 179                 inp->inp_vflag |= INP_IPV6;
 180                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 181                         inp->inp_vflag |= INP_IPV4;
 182                 inp->in6p_hops = -1;    /* use kernel default */
 183         }
 184         else
 185 #endif
 186                 inp->inp_vflag |= INP_IPV4;
 187         tp = tcp_newtcpcb(inp);
 188         if (tp == NULL) {
 189                 error = ENOBUFS;
 190                 in_pcbdetach(inp);
 191                 in_pcbfree(inp);
 192                 goto out;
 193         }
 194         tp->t_state = TCPS_CLOSED;
 195         INP_WUNLOCK(inp);
 196         TCPSTATES_INC(TCPS_CLOSED);
 197         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 198                 so->so_linger = TCP_LINGERTIME;
 199 out:
 200         TCPDEBUG2(PRU_ATTACH);
 201         TCP_PROBE2(debug__user, tp, PRU_ATTACH);
 202         return (error);
 203 }
 204
 205 /*
 206  * tcp_usr_detach is called when the socket layer loses its final reference
 207  * to the socket, be it a file descriptor reference, a reference from TCP,
 208  * etc.  At this point, there is only one case in which we will keep around
 209  * inpcb state: time wait.
 210  */
 211 static void
 212 tcp_usr_detach(struct socket *so)
 213 {
 214         struct inpcb *inp;
 215         struct tcpcb *tp;
 216
 217         inp = sotoinpcb(so);
 218         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 219         INP_WLOCK(inp);
 220         KASSERT(so->so_pcb == inp && inp->inp_socket == so,
 221                 ("%s: socket %p inp %p mismatch", __func__, so, inp));
 222
 223         tp = intotcpcb(inp);
 224
 225         if (inp->inp_flags & INP_TIMEWAIT) {
 226                 /*
 227                  * There are two cases to handle: one in which the time wait
 228                  * state is being discarded (INP_DROPPED), and one in which
 229                  * this connection will remain in timewait.  In the former,
 230                  * it is time to discard all state (except tcptw, which has
 231                  * already been discarded by the timewait close code, which
 232                  * should be further up the call stack somewhere).  In the
 233                  * latter case, we detach from the socket, but leave the pcb
 234                  * present until timewait ends.
 235                  *
 236                  * XXXRW: Would it be cleaner to free the tcptw here?
 237                  *
 238                  * Astute question indeed, from twtcp perspective there are
 239                  * four cases to consider:
 240                  *
 241                  * #1 tcp_usr_detach is called at tcptw creation time by
 242                  *  tcp_twstart, then do not discard the newly created tcptw
 243                  *  and leave inpcb present until timewait ends
 244                  * #2 tcp_usr_detach is called at tcptw creation time by
 245                  *  tcp_twstart, but connection is local and tw will be
 246                  *  discarded immediately
 247                  * #3 tcp_usr_detach is called at timewait end (or reuse) by
 248                  *  tcp_twclose, then the tcptw has already been discarded
 249                  *  (or reused) and inpcb is freed here
 250                  * #4 tcp_usr_detach is called() after timewait ends (or reuse)
 251                  *  (e.g. by soclose), then tcptw has already been discarded
 252                  *  (or reused) and inpcb is freed here
 253                  *
 254                  *  In all three cases the tcptw should not be freed here.
 255                  */
 256                 if (inp->inp_flags & INP_DROPPED) {
 257                         in_pcbdetach(inp);
 258                         if (__predict_true(tp == NULL)) {
 259                                 in_pcbfree(inp);
 260                         } else {
 261                                 /*
 262                                  * This case should not happen as in TIMEWAIT
 263                                  * state the inp should not be destroyed before
 264                                  * its tcptw.  If INVARIANTS is defined, panic.
 265                                  */
 266 #ifdef INVARIANTS
 267                                 panic("%s: Panic before an inp double-free: "
 268                                     "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
 269                                     , __func__);
 270 #else
 271                                 log(LOG_ERR, "%s: Avoid an inp double-free: "
 272                                     "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
 273                                     , __func__);
 274 #endif
 275                                 INP_WUNLOCK(inp);
 276                         }
 277                 } else {
 278                         in_pcbdetach(inp);
 279                         INP_WUNLOCK(inp);
 280                 }
 281         } else {
 282                 /*
 283                  * If the connection is not in timewait, we consider two
 284                  * two conditions: one in which no further processing is
 285                  * necessary (dropped || embryonic), and one in which TCP is
 286                  * not yet done, but no longer requires the socket, so the
 287                  * pcb will persist for the time being.
 288                  *
 289                  * XXXRW: Does the second case still occur?
 290                  */
 291                 if (inp->inp_flags & INP_DROPPED ||
 292                     tp->t_state < TCPS_SYN_SENT) {
 293                         tcp_discardcb(tp);
 294                         in_pcbdetach(inp);
 295                         in_pcbfree(inp);
 296                 } else {
 297                         in_pcbdetach(inp);
 298                         INP_WUNLOCK(inp);
 299                 }
 300         }
 301 }
 302
 303 #ifdef INET
 304 /*
 305  * Give the socket an address.
 306  */
 307 static int
 308 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 309 {
 310         int error = 0;
 311         struct inpcb *inp;
 312         struct tcpcb *tp = NULL;
 313         struct sockaddr_in *sinp;
 314
 315         sinp = (struct sockaddr_in *)nam;
 316         if (nam->sa_len != sizeof (*sinp))
 317                 return (EINVAL);
 318         /*
 319          * Must check for multicast addresses and disallow binding
 320          * to them.
 321          */
 322         if (sinp->sin_family == AF_INET &&
 323             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 324                 return (EAFNOSUPPORT);
 325
 326         TCPDEBUG0;
 327         inp = sotoinpcb(so);
 328         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 329         INP_WLOCK(inp);
 330         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 331                 error = EINVAL;
 332                 goto out;
 333         }
 334         tp = intotcpcb(inp);
 335         TCPDEBUG1();
 336         INP_HASH_WLOCK(&V_tcbinfo);
 337         error = in_pcbbind(inp, nam, td->td_ucred);
 338         INP_HASH_WUNLOCK(&V_tcbinfo);
 339 out:
 340         TCPDEBUG2(PRU_BIND);
 341         TCP_PROBE2(debug__user, tp, PRU_BIND);
 342         INP_WUNLOCK(inp);
 343
 344         return (error);
 345 }
 346 #endif /* INET */
 347
 348 #ifdef INET6
 349 static int
 350 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 351 {
 352         int error = 0;
 353         struct inpcb *inp;
 354         struct tcpcb *tp = NULL;
 355         struct sockaddr_in6 *sin6;
 356         u_char vflagsav;
 357
 358         sin6 = (struct sockaddr_in6 *)nam;
 359         if (nam->sa_len != sizeof (*sin6))
 360                 return (EINVAL);
 361         /*
 362          * Must check for multicast addresses and disallow binding
 363          * to them.
 364          */
 365         if (sin6->sin6_family == AF_INET6 &&
 366             IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 367                 return (EAFNOSUPPORT);
 368
 369         TCPDEBUG0;
 370         inp = sotoinpcb(so);
 371         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 372         INP_WLOCK(inp);
 373         vflagsav = inp->inp_vflag;
 374         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 375                 error = EINVAL;
 376                 goto out;
 377         }
 378         tp = intotcpcb(inp);
 379         TCPDEBUG1();
 380         INP_HASH_WLOCK(&V_tcbinfo);
 381         inp->inp_vflag &= ~INP_IPV4;
 382         inp->inp_vflag |= INP_IPV6;
 383 #ifdef INET
 384         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 385                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 386                         inp->inp_vflag |= INP_IPV4;
 387                 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 388                         struct sockaddr_in sin;
 389
 390                         in6_sin6_2_sin(&sin, sin6);
 391                         if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 392                                 error = EAFNOSUPPORT;
 393                                 INP_HASH_WUNLOCK(&V_tcbinfo);
 394                                 goto out;
 395                         }
 396                         inp->inp_vflag |= INP_IPV4;
 397                         inp->inp_vflag &= ~INP_IPV6;
 398                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 399                             td->td_ucred);
 400                         INP_HASH_WUNLOCK(&V_tcbinfo);
 401                         goto out;
 402                 }
 403         }
 404 #endif
 405         error = in6_pcbbind(inp, nam, td->td_ucred);
 406         INP_HASH_WUNLOCK(&V_tcbinfo);
 407 out:
 408         if (error != 0)
 409                 inp->inp_vflag = vflagsav;
 410         TCPDEBUG2(PRU_BIND);
 411         TCP_PROBE2(debug__user, tp, PRU_BIND);
 412         INP_WUNLOCK(inp);
 413         return (error);
 414 }
 415 #endif /* INET6 */
 416
 417 #ifdef INET
 418 /*
 419  * Prepare to accept connections.
 420  */
 421 static int
 422 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 423 {
 424         int error = 0;
 425         struct inpcb *inp;
 426         struct tcpcb *tp = NULL;
 427
 428         TCPDEBUG0;
 429         inp = sotoinpcb(so);
 430         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 431         INP_WLOCK(inp);
 432         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 433                 error = EINVAL;
 434                 goto out;
 435         }
 436         tp = intotcpcb(inp);
 437         TCPDEBUG1();
 438         SOCK_LOCK(so);
 439         error = solisten_proto_check(so);
 440         INP_HASH_WLOCK(&V_tcbinfo);
 441         if (error == 0 && inp->inp_lport == 0)
 442                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 443         INP_HASH_WUNLOCK(&V_tcbinfo);
 444         if (error == 0) {
 445                 tcp_state_change(tp, TCPS_LISTEN);
 446                 solisten_proto(so, backlog);
 447 #ifdef TCP_OFFLOAD
 448                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 449                         tcp_offload_listen_start(tp);
 450 #endif
 451         }
 452         SOCK_UNLOCK(so);
 453
 454         if (IS_FASTOPEN(tp->t_flags))
 455                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 456
 457 out:
 458         TCPDEBUG2(PRU_LISTEN);
 459         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 460         INP_WUNLOCK(inp);
 461         return (error);
 462 }
 463 #endif /* INET */
 464
 465 #ifdef INET6
 466 static int
 467 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 468 {
 469         int error = 0;
 470         struct inpcb *inp;
 471         struct tcpcb *tp = NULL;
 472         u_char vflagsav;
 473
 474         TCPDEBUG0;
 475         inp = sotoinpcb(so);
 476         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 477         INP_WLOCK(inp);
 478         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 479                 error = EINVAL;
 480                 goto out;
 481         }
 482         vflagsav = inp->inp_vflag;
 483         tp = intotcpcb(inp);
 484         TCPDEBUG1();
 485         SOCK_LOCK(so);
 486         error = solisten_proto_check(so);
 487         INP_HASH_WLOCK(&V_tcbinfo);
 488         if (error == 0 && inp->inp_lport == 0) {
 489                 inp->inp_vflag &= ~INP_IPV4;
 490                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 491                         inp->inp_vflag |= INP_IPV4;
 492                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 493         }
 494         INP_HASH_WUNLOCK(&V_tcbinfo);
 495         if (error == 0) {
 496                 tcp_state_change(tp, TCPS_LISTEN);
 497                 solisten_proto(so, backlog);
 498 #ifdef TCP_OFFLOAD
 499                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 500                         tcp_offload_listen_start(tp);
 501 #endif
 502         }
 503         SOCK_UNLOCK(so);
 504
 505         if (IS_FASTOPEN(tp->t_flags))
 506                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 507
 508         if (error != 0)
 509                 inp->inp_vflag = vflagsav;
 510
 511 out:
 512         TCPDEBUG2(PRU_LISTEN);
 513         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 514         INP_WUNLOCK(inp);
 515         return (error);
 516 }
 517 #endif /* INET6 */
 518
 519 #ifdef INET
 520 /*
 521  * Initiate connection to peer.
 522  * Create a template for use in transmissions on this connection.
 523  * Enter SYN_SENT state, and mark socket as connecting.
 524  * Start keep-alive timer, and seed output sequence space.
 525  * Send initial segment on connection.
 526  */
 527 static int
 528 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 529 {
 530         struct epoch_tracker et;
 531         int error = 0;
 532         struct inpcb *inp;
 533         struct tcpcb *tp = NULL;
 534         struct sockaddr_in *sinp;
 535
 536         sinp = (struct sockaddr_in *)nam;
 537         if (nam->sa_len != sizeof (*sinp))
 538                 return (EINVAL);
 539         /*
 540          * Must disallow TCP ``connections'' to multicast addresses.
 541          */
 542         if (sinp->sin_family == AF_INET
 543             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 544                 return (EAFNOSUPPORT);
 545         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 546                 return (error);
 547
 548         TCPDEBUG0;
 549         inp = sotoinpcb(so);
 550         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 551         INP_WLOCK(inp);
 552         if (inp->inp_flags & INP_TIMEWAIT) {
 553                 error = EADDRINUSE;
 554                 goto out;
 555         }
 556         if (inp->inp_flags & INP_DROPPED) {
 557                 error = ECONNREFUSED;
 558                 goto out;
 559         }
 560         tp = intotcpcb(inp);
 561         TCPDEBUG1();
 562         NET_EPOCH_ENTER(et);
 563         if ((error = tcp_connect(tp, nam, td)) != 0)
 564                 goto out_in_epoch;
 565 #ifdef TCP_OFFLOAD
 566         if (registered_toedevs > 0 &&
 567             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 568             (error = tcp_offload_connect(so, nam)) == 0)
 569                 goto out_in_epoch;
 570 #endif
 571         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 572         error = tp->t_fb->tfb_tcp_output(tp);
 573 out_in_epoch:
 574         NET_EPOCH_EXIT(et);
 575 out:
 576         TCPDEBUG2(PRU_CONNECT);
 577         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 578         INP_WUNLOCK(inp);
 579         return (error);
 580 }
 581 #endif /* INET */
 582
 583 #ifdef INET6
 584 static int
 585 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 586 {
 587         struct epoch_tracker et;
 588         int error = 0;
 589         struct inpcb *inp;
 590         struct tcpcb *tp = NULL;
 591         struct sockaddr_in6 *sin6;
 592         u_int8_t incflagsav;
 593         u_char vflagsav;
 594
 595         TCPDEBUG0;
 596
 597         sin6 = (struct sockaddr_in6 *)nam;
 598         if (nam->sa_len != sizeof (*sin6))
 599                 return (EINVAL);
 600         /*
 601          * Must disallow TCP ``connections'' to multicast addresses.
 602          */
 603         if (sin6->sin6_family == AF_INET6
 604             && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 605                 return (EAFNOSUPPORT);
 606
 607         inp = sotoinpcb(so);
 608         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 609         INP_WLOCK(inp);
 610         vflagsav = inp->inp_vflag;
 611         incflagsav = inp->inp_inc.inc_flags;
 612         if (inp->inp_flags & INP_TIMEWAIT) {
 613                 error = EADDRINUSE;
 614                 goto out;
 615         }
 616         if (inp->inp_flags & INP_DROPPED) {
 617                 error = ECONNREFUSED;
 618                 goto out;
 619         }
 620         tp = intotcpcb(inp);
 621         TCPDEBUG1();
 622 #ifdef INET
 623         /*
 624          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 625          * therefore probably require the hash lock, which isn't held here.
 626          * Is this a significant problem?
 627          */
 628         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 629                 struct sockaddr_in sin;
 630
 631                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 632                         error = EINVAL;
 633                         goto out;
 634                 }
 635                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 636                         error = EAFNOSUPPORT;
 637                         goto out;
 638                 }
 639
 640                 in6_sin6_2_sin(&sin, sin6);
 641                 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 642                         error = EAFNOSUPPORT;
 643                         goto out;
 644                 }
 645                 if ((error = prison_remote_ip4(td->td_ucred,
 646                     &sin.sin_addr)) != 0)
 647                         goto out;
 648                 inp->inp_vflag |= INP_IPV4;
 649                 inp->inp_vflag &= ~INP_IPV6;
 650                 NET_EPOCH_ENTER(et);
 651                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 652                         goto out_in_epoch;
 653 #ifdef TCP_OFFLOAD
 654                 if (registered_toedevs > 0 &&
 655                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 656                     (error = tcp_offload_connect(so, nam)) == 0)
 657                         goto out_in_epoch;
 658 #endif
 659                 error = tp->t_fb->tfb_tcp_output(tp);
 660                 goto out_in_epoch;
 661         } else {
 662                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 663                         error = EAFNOSUPPORT;
 664                         goto out;
 665                 }
 666         }
 667 #endif
 668         if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
 669                 goto out;
 670         inp->inp_vflag &= ~INP_IPV4;
 671         inp->inp_vflag |= INP_IPV6;
 672         inp->inp_inc.inc_flags |= INC_ISIPV6;
 673         if ((error = tcp6_connect(tp, nam, td)) != 0)
 674                 goto out;
 675 #ifdef TCP_OFFLOAD
 676         if (registered_toedevs > 0 &&
 677             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 678             (error = tcp_offload_connect(so, nam)) == 0)
 679                 goto out;
 680 #endif
 681         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 682         NET_EPOCH_ENTER(et);
 683         error = tp->t_fb->tfb_tcp_output(tp);
 684 #ifdef INET
 685 out_in_epoch:
 686 #endif
 687         NET_EPOCH_EXIT(et);
 688 out:
 689         /*
 690          * If the implicit bind in the connect call fails, restore
 691          * the flags we modified.
 692          */
 693         if (error != 0 && inp->inp_lport == 0) {
 694                 inp->inp_vflag = vflagsav;
 695                 inp->inp_inc.inc_flags = incflagsav;
 696         }
 697
 698         TCPDEBUG2(PRU_CONNECT);
 699         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 700         INP_WUNLOCK(inp);
 701         return (error);
 702 }
 703 #endif /* INET6 */
 704
 705 /*
 706  * Initiate disconnect from peer.
 707  * If connection never passed embryonic stage, just drop;
 708  * else if don't need to let data drain, then can just drop anyways,
 709  * else have to begin TCP shutdown process: mark socket disconnecting,
 710  * drain unread data, state switch to reflect user close, and
 711  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 712  * when peer sends FIN and acks ours.
 713  *
 714  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 715  */
 716 static int
 717 tcp_usr_disconnect(struct socket *so)
 718 {
 719         struct inpcb *inp;
 720         struct tcpcb *tp = NULL;
 721         struct epoch_tracker et;
 722         int error = 0;
 723
 724         TCPDEBUG0;
 725         NET_EPOCH_ENTER(et);
 726         inp = sotoinpcb(so);
 727         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 728         INP_WLOCK(inp);
 729         if (inp->inp_flags & INP_TIMEWAIT)
 730                 goto out;
 731         if (inp->inp_flags & INP_DROPPED) {
 732                 error = ECONNRESET;
 733                 goto out;
 734         }
 735         tp = intotcpcb(inp);
 736         TCPDEBUG1();
 737         tcp_disconnect(tp);
 738 out:
 739         TCPDEBUG2(PRU_DISCONNECT);
 740         TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
 741         INP_WUNLOCK(inp);
 742         NET_EPOCH_EXIT(et);
 743         return (error);
 744 }
 745
 746 #ifdef INET
 747 /*
 748  * Accept a connection.  Essentially all the work is done at higher levels;
 749  * just return the address of the peer, storing through addr.
 750  */
 751 static int
 752 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 753 {
 754         int error = 0;
 755         struct inpcb *inp = NULL;
 756         struct tcpcb *tp = NULL;
 757         struct in_addr addr;
 758         in_port_t port = 0;
 759         TCPDEBUG0;
 760
 761         if (so->so_state & SS_ISDISCONNECTED)
 762                 return (ECONNABORTED);
 763
 764         inp = sotoinpcb(so);
 765         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 766         INP_WLOCK(inp);
 767         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 768                 error = ECONNABORTED;
 769                 goto out;
 770         }
 771         tp = intotcpcb(inp);
 772         TCPDEBUG1();
 773
 774         /*
 775          * We inline in_getpeeraddr and COMMON_END here, so that we can
 776          * copy the data of interest and defer the malloc until after we
 777          * release the lock.
 778          */
 779         port = inp->inp_fport;
 780         addr = inp->inp_faddr;
 781
 782 out:
 783         TCPDEBUG2(PRU_ACCEPT);
 784         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 785         INP_WUNLOCK(inp);
 786         if (error == 0)
 787                 *nam = in_sockaddr(port, &addr);
 788         return error;
 789 }
 790 #endif /* INET */
 791
 792 #ifdef INET6
 793 static int
 794 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 795 {
 796         struct inpcb *inp = NULL;
 797         int error = 0;
 798         struct tcpcb *tp = NULL;
 799         struct in_addr addr;
 800         struct in6_addr addr6;
 801         struct epoch_tracker et;
 802         in_port_t port = 0;
 803         int v4 = 0;
 804         TCPDEBUG0;
 805
 806         if (so->so_state & SS_ISDISCONNECTED)
 807                 return (ECONNABORTED);
 808
 809         inp = sotoinpcb(so);
 810         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 811         NET_EPOCH_ENTER(et);
 812         INP_WLOCK(inp);
 813         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 814                 error = ECONNABORTED;
 815                 goto out;
 816         }
 817         tp = intotcpcb(inp);
 818         TCPDEBUG1();
 819
 820         /*
 821          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 822          * copy the data of interest and defer the malloc until after we
 823          * release the lock.
 824          */
 825         if (inp->inp_vflag & INP_IPV4) {
 826                 v4 = 1;
 827                 port = inp->inp_fport;
 828                 addr = inp->inp_faddr;
 829         } else {
 830                 port = inp->inp_fport;
 831                 addr6 = inp->in6p_faddr;
 832         }
 833
 834 out:
 835         TCPDEBUG2(PRU_ACCEPT);
 836         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 837         INP_WUNLOCK(inp);
 838         NET_EPOCH_EXIT(et);
 839         if (error == 0) {
 840                 if (v4)
 841                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 842                 else
 843                         *nam = in6_sockaddr(port, &addr6);
 844         }
 845         return error;
 846 }
 847 #endif /* INET6 */
 848
 849 /*
 850  * Mark the connection as being incapable of further output.
 851  */
 852 static int
 853 tcp_usr_shutdown(struct socket *so)
 854 {
 855         int error = 0;
 856         struct inpcb *inp;
 857         struct tcpcb *tp = NULL;
 858         struct epoch_tracker et;
 859
 860         TCPDEBUG0;
 861         NET_EPOCH_ENTER(et);
 862         inp = sotoinpcb(so);
 863         KASSERT(inp != NULL, ("inp == NULL"));
 864         INP_WLOCK(inp);
 865         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 866                 error = ECONNRESET;
 867                 goto out;
 868         }
 869         tp = intotcpcb(inp);
 870         TCPDEBUG1();
 871         socantsendmore(so);
 872         tcp_usrclosed(tp);
 873         if (!(inp->inp_flags & INP_DROPPED))
 874                 error = tp->t_fb->tfb_tcp_output(tp);
 875
 876 out:
 877         TCPDEBUG2(PRU_SHUTDOWN);
 878         TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
 879         INP_WUNLOCK(inp);
 880         NET_EPOCH_EXIT(et);
 881
 882         return (error);
 883 }
 884
 885 /*
 886  * After a receive, possibly send window update to peer.
 887  */
 888 static int
 889 tcp_usr_rcvd(struct socket *so, int flags)
 890 {
 891         struct epoch_tracker et;
 892         struct inpcb *inp;
 893         struct tcpcb *tp = NULL;
 894         int error = 0;
 895
 896         TCPDEBUG0;
 897         inp = sotoinpcb(so);
 898         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 899         INP_WLOCK(inp);
 900         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 901                 error = ECONNRESET;
 902                 goto out;
 903         }
 904         tp = intotcpcb(inp);
 905         TCPDEBUG1();
 906         /*
 907          * For passively-created TFO connections, don't attempt a window
 908          * update while still in SYN_RECEIVED as this may trigger an early
 909          * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
 910          * application response data, or failing that, when the DELACK timer
 911          * expires.
 912          */
 913         if (IS_FASTOPEN(tp->t_flags) &&
 914             (tp->t_state == TCPS_SYN_RECEIVED))
 915                 goto out;
 916         NET_EPOCH_ENTER(et);
 917 #ifdef TCP_OFFLOAD
 918         if (tp->t_flags & TF_TOE)
 919                 tcp_offload_rcvd(tp);
 920         else
 921 #endif
 922         tp->t_fb->tfb_tcp_output(tp);
 923         NET_EPOCH_EXIT(et);
 924 out:
 925         TCPDEBUG2(PRU_RCVD);
 926         TCP_PROBE2(debug__user, tp, PRU_RCVD);
 927         INP_WUNLOCK(inp);
 928         return (error);
 929 }
 930
 931 /*
 932  * Do a send by putting data in output queue and updating urgent
 933  * marker if URG set.  Possibly send more data.  Unlike the other
 934  * pru_*() routines, the mbuf chains are our responsibility.  We
 935  * must either enqueue them or free them.  The other pru_* routines
 936  * generally are caller-frees.
 937  */
 938 static int
 939 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 940     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 941 {
 942         struct epoch_tracker et;
 943         int error = 0;
 944         struct inpcb *inp;
 945         struct tcpcb *tp = NULL;
 946 #ifdef INET
 947 #ifdef INET6
 948         struct sockaddr_in sin;
 949 #endif
 950         struct sockaddr_in *sinp;
 951 #endif
 952 #ifdef INET6
 953         int isipv6;
 954 #endif
 955         u_int8_t incflagsav;
 956         u_char vflagsav;
 957         bool restoreflags;
 958         TCPDEBUG0;
 959
 960         /*
 961          * We require the pcbinfo "read lock" if we will close the socket
 962          * as part of this call.
 963          */
 964         NET_EPOCH_ENTER(et);
 965         inp = sotoinpcb(so);
 966         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 967         INP_WLOCK(inp);
 968         vflagsav = inp->inp_vflag;
 969         incflagsav = inp->inp_inc.inc_flags;
 970         restoreflags = false;
 971         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 972                 if (control)
 973                         m_freem(control);
 974                 /*
 975                  * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible
 976                  * for freeing memory.
 977                  */
 978                 if (m && (flags & PRUS_NOTREADY) == 0)
 979                         m_freem(m);
 980                 error = ECONNRESET;
 981                 goto out;
 982         }
 983         tp = intotcpcb(inp);
 984         if (flags & PRUS_OOB) {
 985                 if ((error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) {
 986                         if (control)
 987                                 m_freem(control);
 988                         if (m && (flags & PRUS_NOTREADY) == 0)
 989                                 m_freem(m);
 990                         goto out;
 991                 }
 992         }
 993         TCPDEBUG1();
 994         if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
 995                 switch (nam->sa_family) {
 996 #ifdef INET
 997                 case AF_INET:
 998                         sinp = (struct sockaddr_in *)nam;
 999                         if (sinp->sin_len != sizeof(struct sockaddr_in)) {
1000                                 if (m)
1001                                         m_freem(m);
1002                                 error = EINVAL;
1003                                 goto out;
1004                         }
1005                         if ((inp->inp_vflag & INP_IPV6) != 0) {
1006                                 if (m)
1007                                         m_freem(m);
1008                                 error = EAFNOSUPPORT;
1009                                 goto out;
1010                         }
1011                         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
1012                                 if (m)
1013                                         m_freem(m);
1014                                 error = EAFNOSUPPORT;
1015                                 goto out;
1016                         }
1017                         if ((error = prison_remote_ip4(td->td_ucred,
1018                             &sinp->sin_addr))) {
1019                                 if (m)
1020                                         m_freem(m);
1021                                 goto out;
1022                         }
1023 #ifdef INET6
1024                         isipv6 = 0;
1025 #endif
1026                         break;
1027 #endif /* INET */
1028 #ifdef INET6
1029                 case AF_INET6:
1030                 {
1031                         struct sockaddr_in6 *sin6;
1032
1033                         sin6 = (struct sockaddr_in6 *)nam;
1034                         if (sin6->sin6_len != sizeof(*sin6)) {
1035                                 if (m)
1036                                         m_freem(m);
1037                                 error = EINVAL;
1038                                 goto out;
1039                         }
1040                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1041                                 if (m != NULL)
1042                                         m_freem(m);
1043                                 error = EAFNOSUPPORT;
1044                                 goto out;
1045                         }
1046                         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1047                                 if (m)
1048                                         m_freem(m);
1049                                 error = EAFNOSUPPORT;
1050                                 goto out;
1051                         }
1052                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1053 #ifdef INET
1054                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1055                                         error = EINVAL;
1056                                         if (m)
1057                                                 m_freem(m);
1058                                         goto out;
1059                                 }
1060                                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1061                                         error = EAFNOSUPPORT;
1062                                         if (m)
1063                                                 m_freem(m);
1064                                         goto out;
1065                                 }
1066                                 restoreflags = true;
1067                                 inp->inp_vflag &= ~INP_IPV6;
1068                                 sinp = &sin;
1069                                 in6_sin6_2_sin(sinp, sin6);
1070                                 if (IN_MULTICAST(
1071                                     ntohl(sinp->sin_addr.s_addr))) {
1072                                         error = EAFNOSUPPORT;
1073                                         if (m)
1074                                                 m_freem(m);
1075                                         goto out;
1076                                 }
1077                                 if ((error = prison_remote_ip4(td->td_ucred,
1078                                     &sinp->sin_addr))) {
1079                                         if (m)
1080                                                 m_freem(m);
1081                                         goto out;
1082                                 }
1083                                 isipv6 = 0;
1084 #else /* !INET */
1085                                 error = EAFNOSUPPORT;
1086                                 if (m)
1087                                         m_freem(m);
1088                                 goto out;
1089 #endif /* INET */
1090                         } else {
1091                                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1092                                         if (m)
1093                                                 m_freem(m);
1094                                         error = EAFNOSUPPORT;
1095                                         goto out;
1096                                 }
1097                                 restoreflags = true;
1098                                 inp->inp_vflag &= ~INP_IPV4;
1099                                 inp->inp_inc.inc_flags |= INC_ISIPV6;
1100                                 if ((error = prison_remote_ip6(td->td_ucred,
1101                                     &sin6->sin6_addr))) {
1102                                         if (m)
1103                                                 m_freem(m);
1104                                         goto out;
1105                                 }
1106                                 isipv6 = 1;
1107                         }
1108                         break;
1109                 }
1110 #endif /* INET6 */
1111                 default:
1112                         if (m)
1113                                 m_freem(m);
1114                         error = EAFNOSUPPORT;
1115                         goto out;
1116                 }
1117         }
1118         if (control) {
1119                 /* TCP doesn't do control messages (rights, creds, etc) */
1120                 if (control->m_len) {
1121                         m_freem(control);
1122                         if (m)
1123                                 m_freem(m);
1124                         error = EINVAL;
1125                         goto out;
1126                 }
1127                 m_freem(control);       /* empty control, just free it */
1128         }
1129         if (!(flags & PRUS_OOB)) {
1130                 sbappendstream(&so->so_snd, m, flags);
1131                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1132                         /*
1133                          * Do implied connect if not yet connected,
1134                          * initialize window to default value, and
1135                          * initialize maxseg using peer's cached MSS.
1136                          */
1137 #ifdef INET6
1138                         if (isipv6)
1139                                 error = tcp6_connect(tp, nam, td);
1140 #endif /* INET6 */
1141 #if defined(INET6) && defined(INET)
1142                         else
1143 #endif
1144 #ifdef INET
1145                                 error = tcp_connect(tp,
1146                                     (struct sockaddr *)sinp, td);
1147 #endif
1148                         /*
1149                          * The bind operation in tcp_connect succeeded. We
1150                          * no longer want to restore the flags if later
1151                          * operations fail.
1152                          */
1153                         if (error == 0 || inp->inp_lport != 0)
1154                                 restoreflags = false;
1155
1156                         if (error)
1157                                 goto out;
1158                         if (IS_FASTOPEN(tp->t_flags))
1159                                 tcp_fastopen_connect(tp);
1160                         else {
1161                                 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1162                                 tcp_mss(tp, -1);
1163                         }
1164                 }
1165                 if (flags & PRUS_EOF) {
1166                         /*
1167                          * Close the send side of the connection after
1168                          * the data is sent.
1169                          */
1170                         socantsendmore(so);
1171                         tcp_usrclosed(tp);
1172                 }
1173                 if (!(inp->inp_flags & INP_DROPPED) &&
1174                     !(flags & PRUS_NOTREADY)) {
1175                         if (flags & PRUS_MORETOCOME)
1176                                 tp->t_flags |= TF_MORETOCOME;
1177                         error = tp->t_fb->tfb_tcp_output(tp);
1178                         if (flags & PRUS_MORETOCOME)
1179                                 tp->t_flags &= ~TF_MORETOCOME;
1180                 }
1181         } else {
1182                 /*
1183                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1184                  */
1185                 SOCKBUF_LOCK(&so->so_snd);
1186                 if (sbspace(&so->so_snd) < -512) {
1187                         SOCKBUF_UNLOCK(&so->so_snd);
1188                         m_freem(m);
1189                         error = ENOBUFS;
1190                         goto out;
1191                 }
1192                 /*
1193                  * According to RFC961 (Assigned Protocols),
1194                  * the urgent pointer points to the last octet
1195                  * of urgent data.  We continue, however,
1196                  * to consider it to indicate the first octet
1197                  * of data past the urgent section.
1198                  * Otherwise, snd_up should be one lower.
1199                  */
1200                 sbappendstream_locked(&so->so_snd, m, flags);
1201                 SOCKBUF_UNLOCK(&so->so_snd);
1202                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1203                         /*
1204                          * Do implied connect if not yet connected,
1205                          * initialize window to default value, and
1206                          * initialize maxseg using peer's cached MSS.
1207                          */
1208
1209                         /*
1210                          * Not going to contemplate SYN|URG
1211                          */
1212                         if (IS_FASTOPEN(tp->t_flags))
1213                                 tp->t_flags &= ~TF_FASTOPEN;
1214 #ifdef INET6
1215                         if (isipv6)
1216                                 error = tcp6_connect(tp, nam, td);
1217 #endif /* INET6 */
1218 #if defined(INET6) && defined(INET)
1219                         else
1220 #endif
1221 #ifdef INET
1222                                 error = tcp_connect(tp,
1223                                     (struct sockaddr *)sinp, td);
1224 #endif
1225                         /*
1226                          * The bind operation in tcp_connect succeeded. We
1227                          * no longer want to restore the flags if later
1228                          * operations fail.
1229                          */
1230                         if (error == 0 || inp->inp_lport != 0)
1231                                 restoreflags = false;
1232
1233                         if (error)
1234                                 goto out;
1235                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
1236                         tcp_mss(tp, -1);
1237                 }
1238                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1239                 if (!(flags & PRUS_NOTREADY)) {
1240                         tp->t_flags |= TF_FORCEDATA;
1241                         error = tp->t_fb->tfb_tcp_output(tp);
1242                         tp->t_flags &= ~TF_FORCEDATA;
1243                 }
1244         }
1245         TCP_LOG_EVENT(tp, NULL,
1246             &inp->inp_socket->so_rcv,
1247             &inp->inp_socket->so_snd,
1248             TCP_LOG_USERSEND, error,
1249             0, NULL, false);
1250 out:
1251         /*
1252          * If the request was unsuccessful and we changed flags,
1253          * restore the original flags.
1254          */
1255         if (error != 0 && restoreflags) {
1256                 inp->inp_vflag = vflagsav;
1257                 inp->inp_inc.inc_flags = incflagsav;
1258         }
1259         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1260                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1261         TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1262                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1263         INP_WUNLOCK(inp);
1264         NET_EPOCH_EXIT(et);
1265         return (error);
1266 }
1267
1268 static int
1269 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1270 {
1271         struct epoch_tracker et;
1272         struct inpcb *inp;
1273         struct tcpcb *tp;
1274         int error;
1275
1276         inp = sotoinpcb(so);
1277         INP_WLOCK(inp);
1278         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1279                 INP_WUNLOCK(inp);
1280                 mb_free_notready(m, count);
1281                 return (ECONNRESET);
1282         }
1283         tp = intotcpcb(inp);
1284
1285         SOCKBUF_LOCK(&so->so_snd);
1286         error = sbready(&so->so_snd, m, count);
1287         SOCKBUF_UNLOCK(&so->so_snd);
1288         if (error == 0) {
1289                 NET_EPOCH_ENTER(et);
1290                 error = tp->t_fb->tfb_tcp_output(tp);
1291                 NET_EPOCH_EXIT(et);
1292         }
1293         INP_WUNLOCK(inp);
1294
1295         return (error);
1296 }
1297
1298 /*
1299  * Abort the TCP.  Drop the connection abruptly.
1300  */
1301 static void
1302 tcp_usr_abort(struct socket *so)
1303 {
1304         struct inpcb *inp;
1305         struct tcpcb *tp = NULL;
1306         struct epoch_tracker et;
1307         TCPDEBUG0;
1308
1309         inp = sotoinpcb(so);
1310         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1311
1312         NET_EPOCH_ENTER(et);
1313         INP_WLOCK(inp);
1314         KASSERT(inp->inp_socket != NULL,
1315             ("tcp_usr_abort: inp_socket == NULL"));
1316
1317         /*
1318          * If we still have full TCP state, and we're not dropped, drop.
1319          */
1320         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1321             !(inp->inp_flags & INP_DROPPED)) {
1322                 tp = intotcpcb(inp);
1323                 TCPDEBUG1();
1324                 tp = tcp_drop(tp, ECONNABORTED);
1325                 if (tp == NULL)
1326                         goto dropped;
1327                 TCPDEBUG2(PRU_ABORT);
1328                 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1329         }
1330         if (!(inp->inp_flags & INP_DROPPED)) {
1331                 SOCK_LOCK(so);
1332                 so->so_state |= SS_PROTOREF;
1333                 SOCK_UNLOCK(so);
1334                 inp->inp_flags |= INP_SOCKREF;
1335         }
1336         INP_WUNLOCK(inp);
1337 dropped:
1338         NET_EPOCH_EXIT(et);
1339 }
1340
1341 /*
1342  * TCP socket is closed.  Start friendly disconnect.
1343  */
1344 static void
1345 tcp_usr_close(struct socket *so)
1346 {
1347         struct inpcb *inp;
1348         struct tcpcb *tp = NULL;
1349         struct epoch_tracker et;
1350         TCPDEBUG0;
1351
1352         inp = sotoinpcb(so);
1353         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1354
1355         NET_EPOCH_ENTER(et);
1356         INP_WLOCK(inp);
1357         KASSERT(inp->inp_socket != NULL,
1358             ("tcp_usr_close: inp_socket == NULL"));
1359
1360         /*
1361          * If we still have full TCP state, and we're not dropped, initiate
1362          * a disconnect.
1363          */
1364         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1365             !(inp->inp_flags & INP_DROPPED)) {
1366                 tp = intotcpcb(inp);
1367                 TCPDEBUG1();
1368                 tcp_disconnect(tp);
1369                 TCPDEBUG2(PRU_CLOSE);
1370                 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1371         }
1372         if (!(inp->inp_flags & INP_DROPPED)) {
1373                 SOCK_LOCK(so);
1374                 so->so_state |= SS_PROTOREF;
1375                 SOCK_UNLOCK(so);
1376                 inp->inp_flags |= INP_SOCKREF;
1377         }
1378         INP_WUNLOCK(inp);
1379         NET_EPOCH_EXIT(et);
1380 }
1381
1382 static int
1383 tcp_pru_options_support(struct tcpcb *tp, int flags)
1384 {
1385         /*
1386          * If the specific TCP stack has a pru_options
1387          * specified then it does not always support
1388          * all the PRU_XX options and we must ask it.
1389          * If the function is not specified then all
1390          * of the PRU_XX options are supported.
1391          */
1392         int ret = 0;
1393
1394         if (tp->t_fb->tfb_pru_options) {
1395                 ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1396         }
1397         return (ret);
1398 }
1399
1400 /*
1401  * Receive out-of-band data.
1402  */
1403 static int
1404 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1405 {
1406         int error = 0;
1407         struct inpcb *inp;
1408         struct tcpcb *tp = NULL;
1409
1410         TCPDEBUG0;
1411         inp = sotoinpcb(so);
1412         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1413         INP_WLOCK(inp);
1414         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1415                 error = ECONNRESET;
1416                 goto out;
1417         }
1418         tp = intotcpcb(inp);
1419         error = tcp_pru_options_support(tp, PRUS_OOB);
1420         if (error) {
1421                 goto out;
1422         }
1423         TCPDEBUG1();
1424         if ((so->so_oobmark == 0 &&
1425              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1426             so->so_options & SO_OOBINLINE ||
1427             tp->t_oobflags & TCPOOB_HADDATA) {
1428                 error = EINVAL;
1429                 goto out;
1430         }
1431         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1432                 error = EWOULDBLOCK;
1433                 goto out;
1434         }
1435         m->m_len = 1;
1436         *mtod(m, caddr_t) = tp->t_iobc;
1437         if ((flags & MSG_PEEK) == 0)
1438                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1439
1440 out:
1441         TCPDEBUG2(PRU_RCVOOB);
1442         TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1443         INP_WUNLOCK(inp);
1444         return (error);
1445 }
1446
1447 #ifdef INET
1448 struct pr_usrreqs tcp_usrreqs = {
1449         .pru_abort =            tcp_usr_abort,
1450         .pru_accept =           tcp_usr_accept,
1451         .pru_attach =           tcp_usr_attach,
1452         .pru_bind =             tcp_usr_bind,
1453         .pru_connect =          tcp_usr_connect,
1454         .pru_control =          in_control,
1455         .pru_detach =           tcp_usr_detach,
1456         .pru_disconnect =       tcp_usr_disconnect,
1457         .pru_listen =           tcp_usr_listen,
1458         .pru_peeraddr =         in_getpeeraddr,
1459         .pru_rcvd =             tcp_usr_rcvd,
1460         .pru_rcvoob =           tcp_usr_rcvoob,
1461         .pru_send =             tcp_usr_send,
1462         .pru_ready =            tcp_usr_ready,
1463         .pru_shutdown =         tcp_usr_shutdown,
1464         .pru_sockaddr =         in_getsockaddr,
1465         .pru_sosetlabel =       in_pcbsosetlabel,
1466         .pru_close =            tcp_usr_close,
1467 };
1468 #endif /* INET */
1469
1470 #ifdef INET6
1471 struct pr_usrreqs tcp6_usrreqs = {
1472         .pru_abort =            tcp_usr_abort,
1473         .pru_accept =           tcp6_usr_accept,
1474         .pru_attach =           tcp_usr_attach,
1475         .pru_bind =             tcp6_usr_bind,
1476         .pru_connect =          tcp6_usr_connect,
1477         .pru_control =          in6_control,
1478         .pru_detach =           tcp_usr_detach,
1479         .pru_disconnect =       tcp_usr_disconnect,
1480         .pru_listen =           tcp6_usr_listen,
1481         .pru_peeraddr =         in6_mapped_peeraddr,
1482         .pru_rcvd =             tcp_usr_rcvd,
1483         .pru_rcvoob =           tcp_usr_rcvoob,
1484         .pru_send =             tcp_usr_send,
1485         .pru_ready =            tcp_usr_ready,
1486         .pru_shutdown =         tcp_usr_shutdown,
1487         .pru_sockaddr =         in6_mapped_sockaddr,
1488         .pru_sosetlabel =       in_pcbsosetlabel,
1489         .pru_close =            tcp_usr_close,
1490 };
1491 #endif /* INET6 */
1492
1493 #ifdef INET
1494 /*
1495  * Common subroutine to open a TCP connection to remote host specified
1496  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1497  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1498  * to choose a local host address (interface).  If there is an existing
1499  * incarnation of the same connection in TIME-WAIT state and if the remote
1500  * host was sending CC options and if the connection duration was < MSL, then
1501  * truncate the previous TIME-WAIT state and proceed.
1502  * Initialize connection parameters and enter SYN-SENT state.
1503  */
1504 static int
1505 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1506 {
1507         struct inpcb *inp = tp->t_inpcb, *oinp;
1508         struct socket *so = inp->inp_socket;
1509         struct in_addr laddr;
1510         u_short lport;
1511         int error;
1512
1513         NET_EPOCH_ASSERT();
1514         INP_WLOCK_ASSERT(inp);
1515         INP_HASH_WLOCK(&V_tcbinfo);
1516
1517         if (inp->inp_lport == 0) {
1518                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1519                 if (error)
1520                         goto out;
1521         }
1522
1523         /*
1524          * Cannot simply call in_pcbconnect, because there might be an
1525          * earlier incarnation of this same connection still in
1526          * TIME_WAIT state, creating an ADDRINUSE error.
1527          */
1528         laddr = inp->inp_laddr;
1529         lport = inp->inp_lport;
1530         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1531             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1532         if (error && oinp == NULL)
1533                 goto out;
1534         if (oinp) {
1535                 error = EADDRINUSE;
1536                 goto out;
1537         }
1538         inp->inp_laddr = laddr;
1539         in_pcbrehash(inp);
1540         INP_HASH_WUNLOCK(&V_tcbinfo);
1541
1542         /*
1543          * Compute window scaling to request:
1544          * Scale to fit into sweet spot.  See tcp_syncache.c.
1545          * XXX: This should move to tcp_output().
1546          */
1547         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1548             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1549                 tp->request_r_scale++;
1550
1551         soisconnecting(so);
1552         TCPSTAT_INC(tcps_connattempt);
1553         tcp_state_change(tp, TCPS_SYN_SENT);
1554         tp->iss = tcp_new_isn(&inp->inp_inc);
1555         if (tp->t_flags & TF_REQ_TSTMP)
1556                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1557         tcp_sendseqinit(tp);
1558
1559         return 0;
1560
1561 out:
1562         INP_HASH_WUNLOCK(&V_tcbinfo);
1563         return (error);
1564 }
1565 #endif /* INET */
1566
1567 #ifdef INET6
1568 static int
1569 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1570 {
1571         struct inpcb *inp = tp->t_inpcb;
1572         int error;
1573
1574         INP_WLOCK_ASSERT(inp);
1575         INP_HASH_WLOCK(&V_tcbinfo);
1576
1577         if (inp->inp_lport == 0) {
1578                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1579                 if (error)
1580                         goto out;
1581         }
1582         error = in6_pcbconnect(inp, nam, td->td_ucred);
1583         if (error != 0)
1584                 goto out;
1585         INP_HASH_WUNLOCK(&V_tcbinfo);
1586
1587         /* Compute window scaling to request.  */
1588         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1589             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1590                 tp->request_r_scale++;
1591
1592         soisconnecting(inp->inp_socket);
1593         TCPSTAT_INC(tcps_connattempt);
1594         tcp_state_change(tp, TCPS_SYN_SENT);
1595         tp->iss = tcp_new_isn(&inp->inp_inc);
1596         if (tp->t_flags & TF_REQ_TSTMP)
1597                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1598         tcp_sendseqinit(tp);
1599
1600         return 0;
1601
1602 out:
1603         INP_HASH_WUNLOCK(&V_tcbinfo);
1604         return error;
1605 }
1606 #endif /* INET6 */
1607
1608 /*
1609  * Export TCP internal state information via a struct tcp_info, based on the
1610  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1611  * (TCP state machine, etc).  We export all information using FreeBSD-native
1612  * constants -- for example, the numeric values for tcpi_state will differ
1613  * from Linux.
1614  */
1615 static void
1616 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1617 {
1618
1619         INP_WLOCK_ASSERT(tp->t_inpcb);
1620         bzero(ti, sizeof(*ti));
1621
1622         ti->tcpi_state = tp->t_state;
1623         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1624                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1625         if (tp->t_flags & TF_SACK_PERMIT)
1626                 ti->tcpi_options |= TCPI_OPT_SACK;
1627         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1628                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1629                 ti->tcpi_snd_wscale = tp->snd_scale;
1630                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1631         }
1632         if (tp->t_flags2 & TF2_ECN_PERMIT)
1633                 ti->tcpi_options |= TCPI_OPT_ECN;
1634
1635         ti->tcpi_rto = tp->t_rxtcur * tick;
1636         ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1637         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1638         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1639
1640         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1641         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1642
1643         /*
1644          * FreeBSD-specific extension fields for tcp_info.
1645          */
1646         ti->tcpi_rcv_space = tp->rcv_wnd;
1647         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1648         ti->tcpi_snd_wnd = tp->snd_wnd;
1649         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1650         ti->tcpi_snd_nxt = tp->snd_nxt;
1651         ti->tcpi_snd_mss = tp->t_maxseg;
1652         ti->tcpi_rcv_mss = tp->t_maxseg;
1653         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1654         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1655         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1656 #ifdef TCP_OFFLOAD
1657         if (tp->t_flags & TF_TOE) {
1658                 ti->tcpi_options |= TCPI_OPT_TOE;
1659                 tcp_offload_tcp_info(tp, ti);
1660         }
1661 #endif
1662 }
1663
1664 /*
1665  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1666  * socket option arguments.  When it re-acquires the lock after the copy, it
1667  * has to revalidate that the connection is still valid for the socket
1668  * option.
1669  */
1670 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do {                    \
1671         INP_WLOCK(inp);                                                 \
1672         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1673                 INP_WUNLOCK(inp);                                       \
1674                 cleanup;                                                \
1675                 return (ECONNRESET);                                    \
1676         }                                                               \
1677         tp = intotcpcb(inp);                                            \
1678 } while(0)
1679 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1680
1681 int
1682 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1683 {
1684         int     error;
1685         struct  inpcb *inp;
1686         struct  tcpcb *tp;
1687         struct tcp_function_block *blk;
1688         struct tcp_function_set fsn;
1689
1690         error = 0;
1691         inp = sotoinpcb(so);
1692         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1693         if (sopt->sopt_level != IPPROTO_TCP) {
1694 #ifdef INET6
1695                 if (inp->inp_vflag & INP_IPV6PROTO) {
1696                         error = ip6_ctloutput(so, sopt);
1697                         /*
1698                          * In case of the IPV6_USE_MIN_MTU socket option,
1699                          * the INC_IPV6MINMTU flag to announce a corresponding
1700                          * MSS during the initial handshake.
1701                          * If the TCP connection is not in the front states,
1702                          * just reduce the MSS being used.
1703                          * This avoids the sending of TCP segments which will
1704                          * be fragmented at the IPv6 layer.
1705                          */
1706                         if ((error == 0) &&
1707                             (sopt->sopt_dir == SOPT_SET) &&
1708                             (sopt->sopt_level == IPPROTO_IPV6) &&
1709                             (sopt->sopt_name == IPV6_USE_MIN_MTU)) {
1710                                 INP_WLOCK(inp);
1711                                 if ((inp->inp_flags &
1712                                     (INP_TIMEWAIT | INP_DROPPED))) {
1713                                         INP_WUNLOCK(inp);
1714                                         return (ECONNRESET);
1715                                 }
1716                                 inp->inp_inc.inc_flags |= INC_IPV6MINMTU;
1717                                 tp = intotcpcb(inp);
1718                                 if ((tp->t_state >= TCPS_SYN_SENT) &&
1719                                     (inp->inp_inc.inc_flags & INC_ISIPV6)) {
1720                                         struct ip6_pktopts *opt;
1721
1722                                         opt = inp->in6p_outputopts;
1723                                         if ((opt != NULL) &&
1724                                             (opt->ip6po_minmtu ==
1725                                             IP6PO_MINMTU_ALL)) {
1726                                                 if (tp->t_maxseg > TCP6_MSS) {
1727                                                         tp->t_maxseg = TCP6_MSS;
1728                                                 }
1729                                         }
1730                                 }
1731                                 INP_WUNLOCK(inp);
1732                         }
1733                 }
1734 #endif /* INET6 */
1735 #if defined(INET6) && defined(INET)
1736                 else
1737 #endif
1738 #ifdef INET
1739                 {
1740                         error = ip_ctloutput(so, sopt);
1741                 }
1742 #endif
1743                 return (error);
1744         }
1745         INP_WLOCK(inp);
1746         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1747                 INP_WUNLOCK(inp);
1748                 return (ECONNRESET);
1749         }
1750         tp = intotcpcb(inp);
1751         /*
1752          * Protect the TCP option TCP_FUNCTION_BLK so
1753          * that a sub-function can *never* overwrite this.
1754          */
1755         if ((sopt->sopt_dir == SOPT_SET) &&
1756             (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1757                 INP_WUNLOCK(inp);
1758                 error = sooptcopyin(sopt, &fsn, sizeof fsn,
1759                     sizeof fsn);
1760                 if (error)
1761                         return (error);
1762                 INP_WLOCK_RECHECK(inp);
1763                 blk = find_and_ref_tcp_functions(&fsn);
1764                 if (blk == NULL) {
1765                         INP_WUNLOCK(inp);
1766                         return (ENOENT);
1767                 }
1768                 if (tp->t_fb == blk) {
1769                         /* You already have this */
1770                         refcount_release(&blk->tfb_refcnt);
1771                         INP_WUNLOCK(inp);
1772                         return (0);
1773                 }
1774                 if (tp->t_state != TCPS_CLOSED) {
1775                         /*
1776                          * The user has advanced the state
1777                          * past the initial point, we may not
1778                          * be able to switch.
1779                          */
1780                         if (blk->tfb_tcp_handoff_ok != NULL) {
1781                                 /*
1782                                  * Does the stack provide a
1783                                  * query mechanism, if so it may
1784                                  * still be possible?
1785                                  */
1786                                 error = (*blk->tfb_tcp_handoff_ok)(tp);
1787                         } else
1788                                 error = EINVAL;
1789                         if (error) {
1790                                 refcount_release(&blk->tfb_refcnt);
1791                                 INP_WUNLOCK(inp);
1792                                 return(error);
1793                         }
1794                 }
1795                 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1796                         refcount_release(&blk->tfb_refcnt);
1797                         INP_WUNLOCK(inp);
1798                         return (ENOENT);
1799                 }
1800                 /*
1801                  * Release the old refcnt, the
1802                  * lookup acquired a ref on the
1803                  * new one already.
1804                  */
1805                 if (tp->t_fb->tfb_tcp_fb_fini) {
1806                         /*
1807                          * Tell the stack to cleanup with 0 i.e.
1808                          * the tcb is not going away.
1809                          */
1810                         (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1811                 }
1812 #ifdef TCPHPTS
1813                 /* Assure that we are not on any hpts */
1814                 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL);
1815 #endif
1816                 if (blk->tfb_tcp_fb_init) {
1817                         error = (*blk->tfb_tcp_fb_init)(tp);
1818                         if (error) {
1819                                 refcount_release(&blk->tfb_refcnt);
1820                                 if (tp->t_fb->tfb_tcp_fb_init) {
1821                                         if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0)  {
1822                                                 /* Fall back failed, drop the connection */
1823                                                 INP_WUNLOCK(inp);
1824                                                 soabort(so);
1825                                                 return(error);
1826                                         }
1827                                 }
1828                                 goto err_out;
1829                         }
1830                 }
1831                 refcount_release(&tp->t_fb->tfb_refcnt);
1832                 tp->t_fb = blk;
1833 #ifdef TCP_OFFLOAD
1834                 if (tp->t_flags & TF_TOE) {
1835                         tcp_offload_ctloutput(tp, sopt->sopt_dir,
1836                              sopt->sopt_name);
1837                 }
1838 #endif
1839 err_out:
1840                 INP_WUNLOCK(inp);
1841                 return (error);
1842         } else if ((sopt->sopt_dir == SOPT_GET) &&
1843             (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1844                 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name,
1845                     TCP_FUNCTION_NAME_LEN_MAX);
1846                 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1847                 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1848                 INP_WUNLOCK(inp);
1849                 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1850                 return (error);
1851         }
1852         /* Pass in the INP locked, called must unlock it */
1853         return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp));
1854 }
1855
1856 /*
1857  * If this assert becomes untrue, we need to change the size of the buf
1858  * variable in tcp_default_ctloutput().
1859  */
1860 #ifdef CTASSERT
1861 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1862 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1863 #endif
1864
1865 #ifdef KERN_TLS
1866 static int
1867 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
1868 {
1869         struct tls_enable_v0 tls_v0;
1870         int error;
1871
1872         if (sopt->sopt_valsize == sizeof(tls_v0)) {
1873                 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
1874                     sizeof(tls_v0));
1875                 if (error)
1876                         return (error);
1877                 memset(tls, 0, sizeof(*tls));
1878                 tls->cipher_key = tls_v0.cipher_key;
1879                 tls->iv = tls_v0.iv;
1880                 tls->auth_key = tls_v0.auth_key;
1881                 tls->cipher_algorithm = tls_v0.cipher_algorithm;
1882                 tls->cipher_key_len = tls_v0.cipher_key_len;
1883                 tls->iv_len = tls_v0.iv_len;
1884                 tls->auth_algorithm = tls_v0.auth_algorithm;
1885                 tls->auth_key_len = tls_v0.auth_key_len;
1886                 tls->flags = tls_v0.flags;
1887                 tls->tls_vmajor = tls_v0.tls_vmajor;
1888                 tls->tls_vminor = tls_v0.tls_vminor;
1889                 return (0);
1890         }
1891
1892         return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
1893 }
1894 #endif
1895
1896 int
1897 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
1898 {
1899         int     error, opt, optval;
1900         u_int   ui;
1901         struct  tcp_info ti;
1902 #ifdef KERN_TLS
1903         struct tls_enable tls;
1904 #endif
1905         struct cc_algo *algo;
1906         char    *pbuf, buf[TCP_LOG_ID_LEN];
1907 #ifdef STATS
1908         struct statsblob *sbp;
1909 #endif
1910         size_t  len;
1911
1912         /*
1913          * For TCP_CCALGOOPT forward the control to CC module, for both
1914          * SOPT_SET and SOPT_GET.
1915          */
1916         switch (sopt->sopt_name) {
1917         case TCP_CCALGOOPT:
1918                 INP_WUNLOCK(inp);
1919                 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
1920                         return (EINVAL);
1921                 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
1922                 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
1923                     sopt->sopt_valsize);
1924                 if (error) {
1925                         free(pbuf, M_TEMP);
1926                         return (error);
1927                 }
1928                 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
1929                 if (CC_ALGO(tp)->ctl_output != NULL)
1930                         error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
1931                 else
1932                         error = ENOENT;
1933                 INP_WUNLOCK(inp);
1934                 if (error == 0 && sopt->sopt_dir == SOPT_GET)
1935                         error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
1936                 free(pbuf, M_TEMP);
1937                 return (error);
1938         }
1939
1940         switch (sopt->sopt_dir) {
1941         case SOPT_SET:
1942                 switch (sopt->sopt_name) {
1943 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
1944                 case TCP_MD5SIG:
1945                         if (!TCPMD5_ENABLED()) {
1946                                 INP_WUNLOCK(inp);
1947                                 return (ENOPROTOOPT);
1948                         }
1949                         error = TCPMD5_PCBCTL(inp, sopt);
1950                         if (error)
1951                                 return (error);
1952                         goto unlock_and_done;
1953 #endif /* IPSEC */
1954
1955                 case TCP_NODELAY:
1956                 case TCP_NOOPT:
1957                         INP_WUNLOCK(inp);
1958                         error = sooptcopyin(sopt, &optval, sizeof optval,
1959                             sizeof optval);
1960                         if (error)
1961                                 return (error);
1962
1963                         INP_WLOCK_RECHECK(inp);
1964                         switch (sopt->sopt_name) {
1965                         case TCP_NODELAY:
1966                                 opt = TF_NODELAY;
1967                                 break;
1968                         case TCP_NOOPT:
1969                                 opt = TF_NOOPT;
1970                                 break;
1971                         default:
1972                                 opt = 0; /* dead code to fool gcc */
1973                                 break;
1974                         }
1975
1976                         if (optval)
1977                                 tp->t_flags |= opt;
1978                         else
1979                                 tp->t_flags &= ~opt;
1980 unlock_and_done:
1981 #ifdef TCP_OFFLOAD
1982                         if (tp->t_flags & TF_TOE) {
1983                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1984                                     sopt->sopt_name);
1985                         }
1986 #endif
1987                         INP_WUNLOCK(inp);
1988                         break;
1989
1990                 case TCP_NOPUSH:
1991                         INP_WUNLOCK(inp);
1992                         error = sooptcopyin(sopt, &optval, sizeof optval,
1993                             sizeof optval);
1994                         if (error)
1995                                 return (error);
1996
1997                         INP_WLOCK_RECHECK(inp);
1998                         if (optval)
1999                                 tp->t_flags |= TF_NOPUSH;
2000                         else if (tp->t_flags & TF_NOPUSH) {
2001                                 tp->t_flags &= ~TF_NOPUSH;
2002                                 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2003                                         struct epoch_tracker et;
2004
2005                                         NET_EPOCH_ENTER(et);
2006                                         error = tp->t_fb->tfb_tcp_output(tp);
2007                                         NET_EPOCH_EXIT(et);
2008                                 }
2009                         }
2010                         goto unlock_and_done;
2011
2012                 case TCP_MAXSEG:
2013                         INP_WUNLOCK(inp);
2014                         error = sooptcopyin(sopt, &optval, sizeof optval,
2015                             sizeof optval);
2016                         if (error)
2017                                 return (error);
2018
2019                         INP_WLOCK_RECHECK(inp);
2020                         if (optval > 0 && optval <= tp->t_maxseg &&
2021                             optval + 40 >= V_tcp_minmss)
2022                                 tp->t_maxseg = optval;
2023                         else
2024                                 error = EINVAL;
2025                         goto unlock_and_done;
2026
2027                 case TCP_INFO:
2028                         INP_WUNLOCK(inp);
2029                         error = EINVAL;
2030                         break;
2031
2032                 case TCP_STATS:
2033                         INP_WUNLOCK(inp);
2034 #ifdef STATS
2035                         error = sooptcopyin(sopt, &optval, sizeof optval,
2036                             sizeof optval);
2037                         if (error)
2038                                 return (error);
2039
2040                         if (optval > 0)
2041                                 sbp = stats_blob_alloc(
2042                                     V_tcp_perconn_stats_dflt_tpl, 0);
2043                         else
2044                                 sbp = NULL;
2045
2046                         INP_WLOCK_RECHECK(inp);
2047                         if ((tp->t_stats != NULL && sbp == NULL) ||
2048                             (tp->t_stats == NULL && sbp != NULL)) {
2049                                 struct statsblob *t = tp->t_stats;
2050                                 tp->t_stats = sbp;
2051                                 sbp = t;
2052                         }
2053                         INP_WUNLOCK(inp);
2054
2055                         stats_blob_destroy(sbp);
2056 #else
2057                         return (EOPNOTSUPP);
2058 #endif /* !STATS */
2059                         break;
2060
2061                 case TCP_CONGESTION:
2062                         INP_WUNLOCK(inp);
2063                         error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
2064                         if (error)
2065                                 break;
2066                         buf[sopt->sopt_valsize] = '\0';
2067                         INP_WLOCK_RECHECK(inp);
2068                         CC_LIST_RLOCK();
2069                         STAILQ_FOREACH(algo, &cc_list, entries)
2070                                 if (strncmp(buf, algo->name,
2071                                     TCP_CA_NAME_MAX) == 0)
2072                                         break;
2073                         CC_LIST_RUNLOCK();
2074                         if (algo == NULL) {
2075                                 INP_WUNLOCK(inp);
2076                                 error = EINVAL;
2077                                 break;
2078                         }
2079                         /*
2080                          * We hold a write lock over the tcb so it's safe to
2081                          * do these things without ordering concerns.
2082                          */
2083                         if (CC_ALGO(tp)->cb_destroy != NULL)
2084                                 CC_ALGO(tp)->cb_destroy(tp->ccv);
2085                         CC_DATA(tp) = NULL;
2086                         CC_ALGO(tp) = algo;
2087                         /*
2088                          * If something goes pear shaped initialising the new
2089                          * algo, fall back to newreno (which does not
2090                          * require initialisation).
2091                          */
2092                         if (algo->cb_init != NULL &&
2093                             algo->cb_init(tp->ccv) != 0) {
2094                                 CC_ALGO(tp) = &newreno_cc_algo;
2095                                 /*
2096                                  * The only reason init should fail is
2097                                  * because of malloc.
2098                                  */
2099                                 error = ENOMEM;
2100                         }
2101                         INP_WUNLOCK(inp);
2102                         break;
2103
2104 #ifdef KERN_TLS
2105                 case TCP_TXTLS_ENABLE:
2106                         INP_WUNLOCK(inp);
2107                         error = copyin_tls_enable(sopt, &tls);
2108                         if (error)
2109                                 break;
2110                         error = ktls_enable_tx(so, &tls);
2111                         break;
2112                 case TCP_TXTLS_MODE:
2113                         INP_WUNLOCK(inp);
2114                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2115                         if (error)
2116                                 return (error);
2117
2118                         INP_WLOCK_RECHECK(inp);
2119                         error = ktls_set_tx_mode(so, ui);
2120                         INP_WUNLOCK(inp);
2121                         break;
2122                 case TCP_RXTLS_ENABLE:
2123                         INP_WUNLOCK(inp);
2124                         error = sooptcopyin(sopt, &tls, sizeof(tls),
2125                             sizeof(tls));
2126                         if (error)
2127                                 break;
2128                         error = ktls_enable_rx(so, &tls);
2129                         break;
2130 #endif
2131
2132                 case TCP_KEEPIDLE:
2133                 case TCP_KEEPINTVL:
2134                 case TCP_KEEPINIT:
2135                         INP_WUNLOCK(inp);
2136                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2137                         if (error)
2138                                 return (error);
2139
2140                         if (ui > (UINT_MAX / hz)) {
2141                                 error = EINVAL;
2142                                 break;
2143                         }
2144                         ui *= hz;
2145
2146                         INP_WLOCK_RECHECK(inp);
2147                         switch (sopt->sopt_name) {
2148                         case TCP_KEEPIDLE:
2149                                 tp->t_keepidle = ui;
2150                                 /*
2151                                  * XXX: better check current remaining
2152                                  * timeout and "merge" it with new value.
2153                                  */
2154                                 if ((tp->t_state > TCPS_LISTEN) &&
2155                                     (tp->t_state <= TCPS_CLOSING))
2156                                         tcp_timer_activate(tp, TT_KEEP,
2157                                             TP_KEEPIDLE(tp));
2158                                 break;
2159                         case TCP_KEEPINTVL:
2160                                 tp->t_keepintvl = ui;
2161                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2162                                     (TP_MAXIDLE(tp) > 0))
2163                                         tcp_timer_activate(tp, TT_2MSL,
2164                                             TP_MAXIDLE(tp));
2165                                 break;
2166                         case TCP_KEEPINIT:
2167                                 tp->t_keepinit = ui;
2168                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
2169                                     tp->t_state == TCPS_SYN_SENT)
2170                                         tcp_timer_activate(tp, TT_KEEP,
2171                                             TP_KEEPINIT(tp));
2172                                 break;
2173                         }
2174                         goto unlock_and_done;
2175
2176                 case TCP_KEEPCNT:
2177                         INP_WUNLOCK(inp);
2178                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2179                         if (error)
2180                                 return (error);
2181
2182                         INP_WLOCK_RECHECK(inp);
2183                         tp->t_keepcnt = ui;
2184                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2185                             (TP_MAXIDLE(tp) > 0))
2186                                 tcp_timer_activate(tp, TT_2MSL,
2187                                     TP_MAXIDLE(tp));
2188                         goto unlock_and_done;
2189
2190 #ifdef TCPPCAP
2191                 case TCP_PCAP_OUT:
2192                 case TCP_PCAP_IN:
2193                         INP_WUNLOCK(inp);
2194                         error = sooptcopyin(sopt, &optval, sizeof optval,
2195                             sizeof optval);
2196                         if (error)
2197                                 return (error);
2198
2199                         INP_WLOCK_RECHECK(inp);
2200                         if (optval >= 0)
2201                                 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2202                                         &(tp->t_outpkts) : &(tp->t_inpkts),
2203                                         optval);
2204                         else
2205                                 error = EINVAL;
2206                         goto unlock_and_done;
2207 #endif
2208
2209                 case TCP_FASTOPEN: {
2210                         struct tcp_fastopen tfo_optval;
2211
2212                         INP_WUNLOCK(inp);
2213                         if (!V_tcp_fastopen_client_enable &&
2214                             !V_tcp_fastopen_server_enable)
2215                                 return (EPERM);
2216
2217                         error = sooptcopyin(sopt, &tfo_optval,
2218                                     sizeof(tfo_optval), sizeof(int));
2219                         if (error)
2220                                 return (error);
2221
2222                         INP_WLOCK_RECHECK(inp);
2223                         if (tfo_optval.enable) {
2224                                 if (tp->t_state == TCPS_LISTEN) {
2225                                         if (!V_tcp_fastopen_server_enable) {
2226                                                 error = EPERM;
2227                                                 goto unlock_and_done;
2228                                         }
2229
2230                                         tp->t_flags |= TF_FASTOPEN;
2231                                         if (tp->t_tfo_pending == NULL)
2232                                                 tp->t_tfo_pending =
2233                                                     tcp_fastopen_alloc_counter();
2234                                 } else {
2235                                         /*
2236                                          * If a pre-shared key was provided,
2237                                          * stash it in the client cookie
2238                                          * field of the tcpcb for use during
2239                                          * connect.
2240                                          */
2241                                         if (sopt->sopt_valsize ==
2242                                             sizeof(tfo_optval)) {
2243                                                 memcpy(tp->t_tfo_cookie.client,
2244                                                        tfo_optval.psk,
2245                                                        TCP_FASTOPEN_PSK_LEN);
2246                                                 tp->t_tfo_client_cookie_len =
2247                                                     TCP_FASTOPEN_PSK_LEN;
2248                                         }
2249                                         tp->t_flags |= TF_FASTOPEN;
2250                                 }
2251                         } else
2252                                 tp->t_flags &= ~TF_FASTOPEN;
2253                         goto unlock_and_done;
2254                 }
2255
2256 #ifdef TCP_BLACKBOX
2257                 case TCP_LOG:
2258                         INP_WUNLOCK(inp);
2259                         error = sooptcopyin(sopt, &optval, sizeof optval,
2260                             sizeof optval);
2261                         if (error)
2262                                 return (error);
2263
2264                         INP_WLOCK_RECHECK(inp);
2265                         error = tcp_log_state_change(tp, optval);
2266                         goto unlock_and_done;
2267
2268                 case TCP_LOGBUF:
2269                         INP_WUNLOCK(inp);
2270                         error = EINVAL;
2271                         break;
2272
2273                 case TCP_LOGID:
2274                         INP_WUNLOCK(inp);
2275                         error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2276                         if (error)
2277                                 break;
2278                         buf[sopt->sopt_valsize] = '\0';
2279                         INP_WLOCK_RECHECK(inp);
2280                         error = tcp_log_set_id(tp, buf);
2281                         /* tcp_log_set_id() unlocks the INP. */
2282                         break;
2283
2284                 case TCP_LOGDUMP:
2285                 case TCP_LOGDUMPID:
2286                         INP_WUNLOCK(inp);
2287                         error =
2288                             sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2289                         if (error)
2290                                 break;
2291                         buf[sopt->sopt_valsize] = '\0';
2292                         INP_WLOCK_RECHECK(inp);
2293                         if (sopt->sopt_name == TCP_LOGDUMP) {
2294                                 error = tcp_log_dump_tp_logbuf(tp, buf,
2295                                     M_WAITOK, true);
2296                                 INP_WUNLOCK(inp);
2297                         } else {
2298                                 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2299                                 /*
2300                                  * tcp_log_dump_tp_bucket_logbufs() drops the
2301                                  * INP lock.
2302                                  */
2303                         }
2304                         break;
2305 #endif
2306
2307                 default:
2308                         INP_WUNLOCK(inp);
2309                         error = ENOPROTOOPT;
2310                         break;
2311                 }
2312                 break;
2313
2314         case SOPT_GET:
2315                 tp = intotcpcb(inp);
2316                 switch (sopt->sopt_name) {
2317 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2318                 case TCP_MD5SIG:
2319                         if (!TCPMD5_ENABLED()) {
2320                                 INP_WUNLOCK(inp);
2321                                 return (ENOPROTOOPT);
2322                         }
2323                         error = TCPMD5_PCBCTL(inp, sopt);
2324                         break;
2325 #endif
2326
2327                 case TCP_NODELAY:
2328                         optval = tp->t_flags & TF_NODELAY;
2329                         INP_WUNLOCK(inp);
2330                         error = sooptcopyout(sopt, &optval, sizeof optval);
2331                         break;
2332                 case TCP_MAXSEG:
2333                         optval = tp->t_maxseg;
2334                         INP_WUNLOCK(inp);
2335                         error = sooptcopyout(sopt, &optval, sizeof optval);
2336                         break;
2337                 case TCP_NOOPT:
2338                         optval = tp->t_flags & TF_NOOPT;
2339                         INP_WUNLOCK(inp);
2340                         error = sooptcopyout(sopt, &optval, sizeof optval);
2341                         break;
2342                 case TCP_NOPUSH:
2343                         optval = tp->t_flags & TF_NOPUSH;
2344                         INP_WUNLOCK(inp);
2345                         error = sooptcopyout(sopt, &optval, sizeof optval);
2346                         break;
2347                 case TCP_INFO:
2348                         tcp_fill_info(tp, &ti);
2349                         INP_WUNLOCK(inp);
2350                         error = sooptcopyout(sopt, &ti, sizeof ti);
2351                         break;
2352                 case TCP_STATS:
2353                         {
2354 #ifdef STATS
2355                         int nheld;
2356                         TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2357
2358                         error = 0;
2359                         socklen_t outsbsz = sopt->sopt_valsize;
2360                         if (tp->t_stats == NULL)
2361                                 error = ENOENT;
2362                         else if (outsbsz >= tp->t_stats->cursz)
2363                                 outsbsz = tp->t_stats->cursz;
2364                         else if (outsbsz >= sizeof(struct statsblob))
2365                                 outsbsz = sizeof(struct statsblob);
2366                         else
2367                                 error = EINVAL;
2368                         INP_WUNLOCK(inp);
2369                         if (error)
2370                                 break;
2371
2372                         sbp = sopt->sopt_val;
2373                         nheld = atop(round_page(((vm_offset_t)sbp) +
2374                             (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2375                         vm_page_t ma[nheld];
2376                         if (vm_fault_quick_hold_pages(
2377                             &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2378                             outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2379                             nheld) < 0) {
2380                                 error = EFAULT;
2381                                 break;
2382                         }
2383
2384                         if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2385                             SIZEOF_MEMBER(struct statsblob, flags))))
2386                                 goto unhold;
2387
2388                         INP_WLOCK_RECHECK(inp);
2389                         error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2390                             sbflags | SB_CLONE_USRDSTNOFAULT);
2391                         INP_WUNLOCK(inp);
2392                         sopt->sopt_valsize = outsbsz;
2393 unhold:
2394                         vm_page_unhold_pages(ma, nheld);
2395 #else
2396                         INP_WUNLOCK(inp);
2397                         error = EOPNOTSUPP;
2398 #endif /* !STATS */
2399                         break;
2400                         }
2401                 case TCP_CONGESTION:
2402                         len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2403                         INP_WUNLOCK(inp);
2404                         error = sooptcopyout(sopt, buf, len + 1);
2405                         break;
2406                 case TCP_KEEPIDLE:
2407                 case TCP_KEEPINTVL:
2408                 case TCP_KEEPINIT:
2409                 case TCP_KEEPCNT:
2410                         switch (sopt->sopt_name) {
2411                         case TCP_KEEPIDLE:
2412                                 ui = TP_KEEPIDLE(tp) / hz;
2413                                 break;
2414                         case TCP_KEEPINTVL:
2415                                 ui = TP_KEEPINTVL(tp) / hz;
2416                                 break;
2417                         case TCP_KEEPINIT:
2418                                 ui = TP_KEEPINIT(tp) / hz;
2419                                 break;
2420                         case TCP_KEEPCNT:
2421                                 ui = TP_KEEPCNT(tp);
2422                                 break;
2423                         }
2424                         INP_WUNLOCK(inp);
2425                         error = sooptcopyout(sopt, &ui, sizeof(ui));
2426                         break;
2427 #ifdef TCPPCAP
2428                 case TCP_PCAP_OUT:
2429                 case TCP_PCAP_IN:
2430                         optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2431                                         &(tp->t_outpkts) : &(tp->t_inpkts));
2432                         INP_WUNLOCK(inp);
2433                         error = sooptcopyout(sopt, &optval, sizeof optval);
2434                         break;
2435 #endif
2436                 case TCP_FASTOPEN:
2437                         optval = tp->t_flags & TF_FASTOPEN;
2438                         INP_WUNLOCK(inp);
2439                         error = sooptcopyout(sopt, &optval, sizeof optval);
2440                         break;
2441 #ifdef TCP_BLACKBOX
2442                 case TCP_LOG:
2443                         optval = tp->t_logstate;
2444                         INP_WUNLOCK(inp);
2445                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2446                         break;
2447                 case TCP_LOGBUF:
2448                         /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2449                         error = tcp_log_getlogbuf(sopt, tp);
2450                         break;
2451                 case TCP_LOGID:
2452                         len = tcp_log_get_id(tp, buf);
2453                         INP_WUNLOCK(inp);
2454                         error = sooptcopyout(sopt, buf, len + 1);
2455                         break;
2456                 case TCP_LOGDUMP:
2457                 case TCP_LOGDUMPID:
2458                         INP_WUNLOCK(inp);
2459                         error = EINVAL;
2460                         break;
2461 #endif
2462 #ifdef KERN_TLS
2463                 case TCP_TXTLS_MODE:
2464                         optval = ktls_get_tx_mode(so);
2465                         INP_WUNLOCK(inp);
2466                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2467                         break;
2468                 case TCP_RXTLS_MODE:
2469                         optval = ktls_get_rx_mode(so);
2470                         INP_WUNLOCK(inp);
2471                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2472                         break;
2473 #endif
2474                 default:
2475                         INP_WUNLOCK(inp);
2476                         error = ENOPROTOOPT;
2477                         break;
2478                 }
2479                 break;
2480         }
2481         return (error);
2482 }
2483 #undef INP_WLOCK_RECHECK
2484 #undef INP_WLOCK_RECHECK_CLEANUP
2485
2486 /*
2487  * Initiate (or continue) disconnect.
2488  * If embryonic state, just send reset (once).
2489  * If in ``let data drain'' option and linger null, just drop.
2490  * Otherwise (hard), mark socket disconnecting and drop
2491  * current input data; switch states based on user close, and
2492  * send segment to peer (with FIN).
2493  */
2494 static void
2495 tcp_disconnect(struct tcpcb *tp)
2496 {
2497         struct inpcb *inp = tp->t_inpcb;
2498         struct socket *so = inp->inp_socket;
2499
2500         NET_EPOCH_ASSERT();
2501         INP_WLOCK_ASSERT(inp);
2502
2503         /*
2504          * Neither tcp_close() nor tcp_drop() should return NULL, as the
2505          * socket is still open.
2506          */
2507         if (tp->t_state < TCPS_ESTABLISHED &&
2508             !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2509                 tp = tcp_close(tp);
2510                 KASSERT(tp != NULL,
2511                     ("tcp_disconnect: tcp_close() returned NULL"));
2512         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2513                 tp = tcp_drop(tp, 0);
2514                 KASSERT(tp != NULL,
2515                     ("tcp_disconnect: tcp_drop() returned NULL"));
2516         } else {
2517                 soisdisconnecting(so);
2518                 sbflush(&so->so_rcv);
2519                 tcp_usrclosed(tp);
2520                 if (!(inp->inp_flags & INP_DROPPED))
2521                         tp->t_fb->tfb_tcp_output(tp);
2522         }
2523 }
2524
2525 /*
2526  * User issued close, and wish to trail through shutdown states:
2527  * if never received SYN, just forget it.  If got a SYN from peer,
2528  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2529  * If already got a FIN from peer, then almost done; go to LAST_ACK
2530  * state.  In all other cases, have already sent FIN to peer (e.g.
2531  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2532  * for peer to send FIN or not respond to keep-alives, etc.
2533  * We can let the user exit from the close as soon as the FIN is acked.
2534  */
2535 static void
2536 tcp_usrclosed(struct tcpcb *tp)
2537 {
2538
2539         NET_EPOCH_ASSERT();
2540         INP_WLOCK_ASSERT(tp->t_inpcb);
2541
2542         switch (tp->t_state) {
2543         case TCPS_LISTEN:
2544 #ifdef TCP_OFFLOAD
2545                 tcp_offload_listen_stop(tp);
2546 #endif
2547                 tcp_state_change(tp, TCPS_CLOSED);
2548                 /* FALLTHROUGH */
2549         case TCPS_CLOSED:
2550                 tp = tcp_close(tp);
2551                 /*
2552                  * tcp_close() should never return NULL here as the socket is
2553                  * still open.
2554                  */
2555                 KASSERT(tp != NULL,
2556                     ("tcp_usrclosed: tcp_close() returned NULL"));
2557                 break;
2558
2559         case TCPS_SYN_SENT:
2560         case TCPS_SYN_RECEIVED:
2561                 tp->t_flags |= TF_NEEDFIN;
2562                 break;
2563
2564         case TCPS_ESTABLISHED:
2565                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2566                 break;
2567
2568         case TCPS_CLOSE_WAIT:
2569                 tcp_state_change(tp, TCPS_LAST_ACK);
2570                 break;
2571         }
2572         if (tp->t_state >= TCPS_FIN_WAIT_2) {
2573                 soisdisconnected(tp->t_inpcb->inp_socket);
2574                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2575                 if (tp->t_state == TCPS_FIN_WAIT_2) {
2576                         int timeout;
2577
2578                         timeout = (tcp_fast_finwait2_recycle) ?
2579                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
2580                         tcp_timer_activate(tp, TT_2MSL, timeout);
2581                 }
2582         }
2583 }
2584
2585 #ifdef DDB
2586 static void
2587 db_print_indent(int indent)
2588 {
2589         int i;
2590
2591         for (i = 0; i < indent; i++)
2592                 db_printf(" ");
2593 }
2594
2595 static void
2596 db_print_tstate(int t_state)
2597 {
2598
2599         switch (t_state) {
2600         case TCPS_CLOSED:
2601                 db_printf("TCPS_CLOSED");
2602                 return;
2603
2604         case TCPS_LISTEN:
2605                 db_printf("TCPS_LISTEN");
2606                 return;
2607
2608         case TCPS_SYN_SENT:
2609                 db_printf("TCPS_SYN_SENT");
2610                 return;
2611
2612         case TCPS_SYN_RECEIVED:
2613                 db_printf("TCPS_SYN_RECEIVED");
2614                 return;
2615
2616         case TCPS_ESTABLISHED:
2617                 db_printf("TCPS_ESTABLISHED");
2618                 return;
2619
2620         case TCPS_CLOSE_WAIT:
2621                 db_printf("TCPS_CLOSE_WAIT");
2622                 return;
2623
2624         case TCPS_FIN_WAIT_1:
2625                 db_printf("TCPS_FIN_WAIT_1");
2626                 return;
2627
2628         case TCPS_CLOSING:
2629                 db_printf("TCPS_CLOSING");
2630                 return;
2631
2632         case TCPS_LAST_ACK:
2633                 db_printf("TCPS_LAST_ACK");
2634                 return;
2635
2636         case TCPS_FIN_WAIT_2:
2637                 db_printf("TCPS_FIN_WAIT_2");
2638                 return;
2639
2640         case TCPS_TIME_WAIT:
2641                 db_printf("TCPS_TIME_WAIT");
2642                 return;
2643
2644         default:
2645                 db_printf("unknown");
2646                 return;
2647         }
2648 }
2649
2650 static void
2651 db_print_tflags(u_int t_flags)
2652 {
2653         int comma;
2654
2655         comma = 0;
2656         if (t_flags & TF_ACKNOW) {
2657                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2658                 comma = 1;
2659         }
2660         if (t_flags & TF_DELACK) {
2661                 db_printf("%sTF_DELACK", comma ? ", " : "");
2662                 comma = 1;
2663         }
2664         if (t_flags & TF_NODELAY) {
2665                 db_printf("%sTF_NODELAY", comma ? ", " : "");
2666                 comma = 1;
2667         }
2668         if (t_flags & TF_NOOPT) {
2669                 db_printf("%sTF_NOOPT", comma ? ", " : "");
2670                 comma = 1;
2671         }
2672         if (t_flags & TF_SENTFIN) {
2673                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2674                 comma = 1;
2675         }
2676         if (t_flags & TF_REQ_SCALE) {
2677                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2678                 comma = 1;
2679         }
2680         if (t_flags & TF_RCVD_SCALE) {
2681                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2682                 comma = 1;
2683         }
2684         if (t_flags & TF_REQ_TSTMP) {
2685                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2686                 comma = 1;
2687         }
2688         if (t_flags & TF_RCVD_TSTMP) {
2689                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2690                 comma = 1;
2691         }
2692         if (t_flags & TF_SACK_PERMIT) {
2693                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2694                 comma = 1;
2695         }
2696         if (t_flags & TF_NEEDSYN) {
2697                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2698                 comma = 1;
2699         }
2700         if (t_flags & TF_NEEDFIN) {
2701                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2702                 comma = 1;
2703         }
2704         if (t_flags & TF_NOPUSH) {
2705                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2706                 comma = 1;
2707         }
2708         if (t_flags & TF_MORETOCOME) {
2709                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2710                 comma = 1;
2711         }
2712         if (t_flags & TF_LQ_OVERFLOW) {
2713                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2714                 comma = 1;
2715         }
2716         if (t_flags & TF_LASTIDLE) {
2717                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2718                 comma = 1;
2719         }
2720         if (t_flags & TF_RXWIN0SENT) {
2721                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2722                 comma = 1;
2723         }
2724         if (t_flags & TF_FASTRECOVERY) {
2725                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2726                 comma = 1;
2727         }
2728         if (t_flags & TF_CONGRECOVERY) {
2729                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2730                 comma = 1;
2731         }
2732         if (t_flags & TF_WASFRECOVERY) {
2733                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2734                 comma = 1;
2735         }
2736         if (t_flags & TF_SIGNATURE) {
2737                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2738                 comma = 1;
2739         }
2740         if (t_flags & TF_FORCEDATA) {
2741                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2742                 comma = 1;
2743         }
2744         if (t_flags & TF_TSO) {
2745                 db_printf("%sTF_TSO", comma ? ", " : "");
2746                 comma = 1;
2747         }
2748         if (t_flags & TF_FASTOPEN) {
2749                 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2750                 comma = 1;
2751         }
2752 }
2753
2754 static void
2755 db_print_tflags2(u_int t_flags2)
2756 {
2757         int comma;
2758
2759         comma = 0;
2760         if (t_flags2 & TF2_ECN_PERMIT) {
2761                 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
2762                 comma = 1;
2763         }
2764 }
2765
2766
2767 static void
2768 db_print_toobflags(char t_oobflags)
2769 {
2770         int comma;
2771
2772         comma = 0;
2773         if (t_oobflags & TCPOOB_HAVEDATA) {
2774                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
2775                 comma = 1;
2776         }
2777         if (t_oobflags & TCPOOB_HADDATA) {
2778                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
2779                 comma = 1;
2780         }
2781 }
2782
2783 static void
2784 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
2785 {
2786
2787         db_print_indent(indent);
2788         db_printf("%s at %p\n", name, tp);
2789
2790         indent += 2;
2791
2792         db_print_indent(indent);
2793         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
2794            TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
2795
2796         db_print_indent(indent);
2797         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
2798             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
2799
2800         db_print_indent(indent);
2801         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
2802             &tp->t_timers->tt_delack, tp->t_inpcb);
2803
2804         db_print_indent(indent);
2805         db_printf("t_state: %d (", tp->t_state);
2806         db_print_tstate(tp->t_state);
2807         db_printf(")\n");
2808
2809         db_print_indent(indent);
2810         db_printf("t_flags: 0x%x (", tp->t_flags);
2811         db_print_tflags(tp->t_flags);
2812         db_printf(")\n");
2813
2814         db_print_indent(indent);
2815         db_printf("t_flags2: 0x%x (", tp->t_flags2);
2816         db_print_tflags2(tp->t_flags2);
2817         db_printf(")\n");
2818
2819         db_print_indent(indent);
2820         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
2821             tp->snd_una, tp->snd_max, tp->snd_nxt);
2822
2823         db_print_indent(indent);
2824         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
2825            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
2826
2827         db_print_indent(indent);
2828         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
2829             tp->iss, tp->irs, tp->rcv_nxt);
2830
2831         db_print_indent(indent);
2832         db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
2833             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
2834
2835         db_print_indent(indent);
2836         db_printf("snd_wnd: %u   snd_cwnd: %u\n",
2837            tp->snd_wnd, tp->snd_cwnd);
2838
2839         db_print_indent(indent);
2840         db_printf("snd_ssthresh: %u   snd_recover: "
2841             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
2842
2843         db_print_indent(indent);
2844         db_printf("t_rcvtime: %u   t_startime: %u\n",
2845             tp->t_rcvtime, tp->t_starttime);
2846
2847         db_print_indent(indent);
2848         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
2849             tp->t_rtttime, tp->t_rtseq);
2850
2851         db_print_indent(indent);
2852         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
2853             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
2854
2855         db_print_indent(indent);
2856         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
2857             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
2858             tp->t_rttbest);
2859
2860         db_print_indent(indent);
2861         db_printf("t_rttupdated: %lu   max_sndwnd: %u   t_softerror: %d\n",
2862             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2863
2864         db_print_indent(indent);
2865         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2866         db_print_toobflags(tp->t_oobflags);
2867         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
2868
2869         db_print_indent(indent);
2870         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
2871             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2872
2873         db_print_indent(indent);
2874         db_printf("ts_recent: %u   ts_recent_age: %u\n",
2875             tp->ts_recent, tp->ts_recent_age);
2876
2877         db_print_indent(indent);
2878         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
2879             "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2880
2881         db_print_indent(indent);
2882         db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
2883             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2884             tp->snd_recover_prev, tp->t_badrxtwin);
2885
2886         db_print_indent(indent);
2887         db_printf("snd_numholes: %d  snd_holes first: %p\n",
2888             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2889
2890         db_print_indent(indent);
2891         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d\n",
2892             tp->snd_fack, tp->rcv_numsacks);
2893
2894         /* Skip sackblks, sackhint. */
2895
2896         db_print_indent(indent);
2897         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
2898             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2899 }
2900
2901 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2902 {
2903         struct tcpcb *tp;
2904
2905         if (!have_addr) {
2906                 db_printf("usage: show tcpcb <addr>\n");
2907                 return;
2908         }
2909         tp = (struct tcpcb *)addr;
2910
2911         db_print_tcpcb(tp, "tcpcb", 0);
2912 }
2913 #endif