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
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/arb.h>
  52 #include <sys/limits.h>
  53 #include <sys/malloc.h>
  54 #include <sys/refcount.h>
  55 #include <sys/kernel.h>
  56 #include <sys/ktls.h>
  57 #include <sys/qmath.h>
  58 #include <sys/sysctl.h>
  59 #include <sys/mbuf.h>
  60 #ifdef INET6
  61 #include <sys/domain.h>
  62 #endif /* INET6 */
  63 #include <sys/socket.h>
  64 #include <sys/socketvar.h>
  65 #include <sys/protosw.h>
  66 #include <sys/proc.h>
  67 #include <sys/jail.h>
  68 #include <sys/stats.h>
  69
  70 #ifdef DDB
  71 #include <ddb/ddb.h>
  72 #endif
  73
  74 #include <net/if.h>
  75 #include <net/if_var.h>
  76 #include <net/route.h>
  77 #include <net/vnet.h>
  78
  79 #include <netinet/in.h>
  80 #include <netinet/in_kdtrace.h>
  81 #include <netinet/in_pcb.h>
  82 #include <netinet/in_systm.h>
  83 #include <netinet/in_var.h>
  84 #include <netinet/ip.h>
  85 #include <netinet/ip_var.h>
  86 #ifdef INET6
  87 #include <netinet/ip6.h>
  88 #include <netinet6/in6_pcb.h>
  89 #include <netinet6/ip6_var.h>
  90 #include <netinet6/scope6_var.h>
  91 #endif
  92 #include <netinet/tcp.h>
  93 #include <netinet/tcp_fsm.h>
  94 #include <netinet/tcp_seq.h>
  95 #include <netinet/tcp_timer.h>
  96 #include <netinet/tcp_var.h>
  97 #include <netinet/tcp_log_buf.h>
  98 #include <netinet/tcpip.h>
  99 #include <netinet/cc/cc.h>
 100 #include <netinet/tcp_fastopen.h>
 101 #include <netinet/tcp_hpts.h>
 102 #ifdef TCPPCAP
 103 #include <netinet/tcp_pcap.h>
 104 #endif
 105 #ifdef TCP_OFFLOAD
 106 #include <netinet/tcp_offload.h>
 107 #endif
 108 #include <netipsec/ipsec_support.h>
 109
 110 #include <vm/vm.h>
 111 #include <vm/vm_param.h>
 112 #include <vm/pmap.h>
 113 #include <vm/vm_extern.h>
 114 #include <vm/vm_map.h>
 115 #include <vm/vm_page.h>
 116
 117 /*
 118  * TCP protocol interface to socket abstraction.
 119  */
 120 #ifdef INET
 121 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
 122                     struct thread *td);
 123 #endif /* INET */
 124 #ifdef INET6
 125 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
 126                     struct thread *td);
 127 #endif /* INET6 */
 128 static void     tcp_disconnect(struct tcpcb *);
 129 static void     tcp_usrclosed(struct tcpcb *);
 130 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 131
 132 static int      tcp_pru_options_support(struct tcpcb *tp, int flags);
 133
 134 /*
 135  * tcp_require_unique port requires a globally-unique source port for each
 136  * outgoing connection.  The default is to require the 4-tuple to be unique.
 137  */
 138 VNET_DEFINE(int, tcp_require_unique_port) = 0;
 139 SYSCTL_INT(_net_inet_tcp, OID_AUTO, require_unique_port,
 140     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_require_unique_port), 0,
 141     "Require globally-unique ephemeral port for outgoing connections");
 142 #define V_tcp_require_unique_port       VNET(tcp_require_unique_port)
 143
 144 /*
 145  * TCP attaches to socket via pru_attach(), reserving space,
 146  * and an internet control block.
 147  */
 148 static int
 149 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 150 {
 151         struct inpcb *inp;
 152         struct tcpcb *tp = NULL;
 153         int error;
 154
 155         inp = sotoinpcb(so);
 156         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 157
 158         error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
 159         if (error)
 160                 goto out;
 161
 162         so->so_rcv.sb_flags |= SB_AUTOSIZE;
 163         so->so_snd.sb_flags |= SB_AUTOSIZE;
 164         error = in_pcballoc(so, &V_tcbinfo);
 165         if (error)
 166                 goto out;
 167         inp = sotoinpcb(so);
 168         tp = tcp_newtcpcb(inp);
 169         if (tp == NULL) {
 170                 error = ENOBUFS;
 171                 in_pcbdetach(inp);
 172                 in_pcbfree(inp);
 173                 goto out;
 174         }
 175         tp->t_state = TCPS_CLOSED;
 176         INP_WUNLOCK(inp);
 177         TCPSTATES_INC(TCPS_CLOSED);
 178 out:
 179         TCP_PROBE2(debug__user, tp, PRU_ATTACH);
 180         return (error);
 181 }
 182
 183 /*
 184  * tcp_usr_detach is called when the socket layer loses its final reference
 185  * to the socket, be it a file descriptor reference, a reference from TCP,
 186  * etc.  At this point, there is only one case in which we will keep around
 187  * inpcb state: time wait.
 188  */
 189 static void
 190 tcp_usr_detach(struct socket *so)
 191 {
 192         struct inpcb *inp;
 193         struct tcpcb *tp;
 194
 195         inp = sotoinpcb(so);
 196         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 197         INP_WLOCK(inp);
 198         KASSERT(so->so_pcb == inp && inp->inp_socket == so,
 199                 ("%s: socket %p inp %p mismatch", __func__, so, inp));
 200
 201         tp = intotcpcb(inp);
 202
 203         KASSERT(inp->inp_flags & INP_DROPPED ||
 204             tp->t_state < TCPS_SYN_SENT,
 205             ("%s: inp %p not dropped or embryonic", __func__, inp));
 206
 207         tcp_discardcb(tp);
 208         in_pcbdetach(inp);
 209         in_pcbfree(inp);
 210 }
 211
 212 #ifdef INET
 213 /*
 214  * Give the socket an address.
 215  */
 216 static int
 217 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 218 {
 219         int error = 0;
 220         struct inpcb *inp;
 221 #ifdef KDTRACE_HOOKS
 222         struct tcpcb *tp = NULL;
 223 #endif
 224         struct sockaddr_in *sinp;
 225
 226         sinp = (struct sockaddr_in *)nam;
 227         if (nam->sa_family != AF_INET) {
 228                 /*
 229                  * Preserve compatibility with old programs.
 230                  */
 231                 if (nam->sa_family != AF_UNSPEC ||
 232                     nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
 233                     sinp->sin_addr.s_addr != INADDR_ANY)
 234                         return (EAFNOSUPPORT);
 235                 nam->sa_family = AF_INET;
 236         }
 237         if (nam->sa_len != sizeof(*sinp))
 238                 return (EINVAL);
 239
 240         /*
 241          * Must check for multicast addresses and disallow binding
 242          * to them.
 243          */
 244         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 245                 return (EAFNOSUPPORT);
 246
 247         inp = sotoinpcb(so);
 248         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 249         INP_WLOCK(inp);
 250         if (inp->inp_flags & INP_DROPPED) {
 251                 error = EINVAL;
 252                 goto out;
 253         }
 254 #ifdef KDTRACE_HOOKS
 255         tp = intotcpcb(inp);
 256 #endif
 257         INP_HASH_WLOCK(&V_tcbinfo);
 258         error = in_pcbbind(inp, nam, td->td_ucred);
 259         INP_HASH_WUNLOCK(&V_tcbinfo);
 260 out:
 261         TCP_PROBE2(debug__user, tp, PRU_BIND);
 262         INP_WUNLOCK(inp);
 263
 264         return (error);
 265 }
 266 #endif /* INET */
 267
 268 #ifdef INET6
 269 static int
 270 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 271 {
 272         int error = 0;
 273         struct inpcb *inp;
 274 #ifdef KDTRACE_HOOKS
 275         struct tcpcb *tp = NULL;
 276 #endif
 277         struct sockaddr_in6 *sin6;
 278         u_char vflagsav;
 279
 280         sin6 = (struct sockaddr_in6 *)nam;
 281         if (nam->sa_family != AF_INET6)
 282                 return (EAFNOSUPPORT);
 283         if (nam->sa_len != sizeof(*sin6))
 284                 return (EINVAL);
 285
 286         /*
 287          * Must check for multicast addresses and disallow binding
 288          * to them.
 289          */
 290         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 291                 return (EAFNOSUPPORT);
 292
 293         inp = sotoinpcb(so);
 294         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 295         INP_WLOCK(inp);
 296         vflagsav = inp->inp_vflag;
 297         if (inp->inp_flags & INP_DROPPED) {
 298                 error = EINVAL;
 299                 goto out;
 300         }
 301 #ifdef KDTRACE_HOOKS
 302         tp = intotcpcb(inp);
 303 #endif
 304         INP_HASH_WLOCK(&V_tcbinfo);
 305         inp->inp_vflag &= ~INP_IPV4;
 306         inp->inp_vflag |= INP_IPV6;
 307 #ifdef INET
 308         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 309                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 310                         inp->inp_vflag |= INP_IPV4;
 311                 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 312                         struct sockaddr_in sin;
 313
 314                         in6_sin6_2_sin(&sin, sin6);
 315                         if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 316                                 error = EAFNOSUPPORT;
 317                                 INP_HASH_WUNLOCK(&V_tcbinfo);
 318                                 goto out;
 319                         }
 320                         inp->inp_vflag |= INP_IPV4;
 321                         inp->inp_vflag &= ~INP_IPV6;
 322                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 323                             td->td_ucred);
 324                         INP_HASH_WUNLOCK(&V_tcbinfo);
 325                         goto out;
 326                 }
 327         }
 328 #endif
 329         error = in6_pcbbind(inp, nam, td->td_ucred);
 330         INP_HASH_WUNLOCK(&V_tcbinfo);
 331 out:
 332         if (error != 0)
 333                 inp->inp_vflag = vflagsav;
 334         TCP_PROBE2(debug__user, tp, PRU_BIND);
 335         INP_WUNLOCK(inp);
 336         return (error);
 337 }
 338 #endif /* INET6 */
 339
 340 #ifdef INET
 341 /*
 342  * Prepare to accept connections.
 343  */
 344 static int
 345 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 346 {
 347         int error = 0;
 348         struct inpcb *inp;
 349         struct tcpcb *tp = NULL;
 350
 351         inp = sotoinpcb(so);
 352         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 353         INP_WLOCK(inp);
 354         if (inp->inp_flags & INP_DROPPED) {
 355                 error = EINVAL;
 356                 goto out;
 357         }
 358         tp = intotcpcb(inp);
 359         SOCK_LOCK(so);
 360         error = solisten_proto_check(so);
 361         if (error != 0) {
 362                 SOCK_UNLOCK(so);
 363                 goto out;
 364         }
 365         if (inp->inp_lport == 0) {
 366                 INP_HASH_WLOCK(&V_tcbinfo);
 367                 error = in_pcbbind(inp, NULL, td->td_ucred);
 368                 INP_HASH_WUNLOCK(&V_tcbinfo);
 369         }
 370         if (error == 0) {
 371                 tcp_state_change(tp, TCPS_LISTEN);
 372                 solisten_proto(so, backlog);
 373 #ifdef TCP_OFFLOAD
 374                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 375                         tcp_offload_listen_start(tp);
 376 #endif
 377         } else {
 378                 solisten_proto_abort(so);
 379         }
 380         SOCK_UNLOCK(so);
 381
 382         if (IS_FASTOPEN(tp->t_flags))
 383                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 384
 385 out:
 386         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 387         INP_WUNLOCK(inp);
 388         return (error);
 389 }
 390 #endif /* INET */
 391
 392 #ifdef INET6
 393 static int
 394 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 395 {
 396         int error = 0;
 397         struct inpcb *inp;
 398         struct tcpcb *tp = NULL;
 399         u_char vflagsav;
 400
 401         inp = sotoinpcb(so);
 402         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 403         INP_WLOCK(inp);
 404         if (inp->inp_flags & INP_DROPPED) {
 405                 error = EINVAL;
 406                 goto out;
 407         }
 408         vflagsav = inp->inp_vflag;
 409         tp = intotcpcb(inp);
 410         SOCK_LOCK(so);
 411         error = solisten_proto_check(so);
 412         if (error != 0) {
 413                 SOCK_UNLOCK(so);
 414                 goto out;
 415         }
 416         INP_HASH_WLOCK(&V_tcbinfo);
 417         if (inp->inp_lport == 0) {
 418                 inp->inp_vflag &= ~INP_IPV4;
 419                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 420                         inp->inp_vflag |= INP_IPV4;
 421                 error = in6_pcbbind(inp, NULL, td->td_ucred);
 422         }
 423         INP_HASH_WUNLOCK(&V_tcbinfo);
 424         if (error == 0) {
 425                 tcp_state_change(tp, TCPS_LISTEN);
 426                 solisten_proto(so, backlog);
 427 #ifdef TCP_OFFLOAD
 428                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 429                         tcp_offload_listen_start(tp);
 430 #endif
 431         } else {
 432                 solisten_proto_abort(so);
 433         }
 434         SOCK_UNLOCK(so);
 435
 436         if (IS_FASTOPEN(tp->t_flags))
 437                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 438
 439         if (error != 0)
 440                 inp->inp_vflag = vflagsav;
 441
 442 out:
 443         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 444         INP_WUNLOCK(inp);
 445         return (error);
 446 }
 447 #endif /* INET6 */
 448
 449 #ifdef INET
 450 /*
 451  * Initiate connection to peer.
 452  * Create a template for use in transmissions on this connection.
 453  * Enter SYN_SENT state, and mark socket as connecting.
 454  * Start keep-alive timer, and seed output sequence space.
 455  * Send initial segment on connection.
 456  */
 457 static int
 458 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 459 {
 460         struct epoch_tracker et;
 461         int error = 0;
 462         struct inpcb *inp;
 463         struct tcpcb *tp = NULL;
 464         struct sockaddr_in *sinp;
 465
 466         sinp = (struct sockaddr_in *)nam;
 467         if (nam->sa_family != AF_INET)
 468                 return (EAFNOSUPPORT);
 469         if (nam->sa_len != sizeof (*sinp))
 470                 return (EINVAL);
 471
 472         /*
 473          * Must disallow TCP ``connections'' to multicast addresses.
 474          */
 475         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 476                 return (EAFNOSUPPORT);
 477         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST)
 478                 return (EACCES);
 479         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 480                 return (error);
 481
 482         inp = sotoinpcb(so);
 483         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 484         INP_WLOCK(inp);
 485         if (inp->inp_flags & INP_DROPPED) {
 486                 error = ECONNREFUSED;
 487                 goto out;
 488         }
 489         if (SOLISTENING(so)) {
 490                 error = EOPNOTSUPP;
 491                 goto out;
 492         }
 493         tp = intotcpcb(inp);
 494         NET_EPOCH_ENTER(et);
 495         if ((error = tcp_connect(tp, nam, td)) != 0)
 496                 goto out_in_epoch;
 497 #ifdef TCP_OFFLOAD
 498         if (registered_toedevs > 0 &&
 499             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 500             (error = tcp_offload_connect(so, nam)) == 0)
 501                 goto out_in_epoch;
 502 #endif
 503         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 504         error = tcp_output(tp);
 505         KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
 506             ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
 507 out_in_epoch:
 508         NET_EPOCH_EXIT(et);
 509 out:
 510         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 511         INP_WUNLOCK(inp);
 512         return (error);
 513 }
 514 #endif /* INET */
 515
 516 #ifdef INET6
 517 static int
 518 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 519 {
 520         struct epoch_tracker et;
 521         int error = 0;
 522         struct inpcb *inp;
 523         struct tcpcb *tp = NULL;
 524         struct sockaddr_in6 *sin6;
 525         u_int8_t incflagsav;
 526         u_char vflagsav;
 527
 528         sin6 = (struct sockaddr_in6 *)nam;
 529         if (nam->sa_family != AF_INET6)
 530                 return (EAFNOSUPPORT);
 531         if (nam->sa_len != sizeof (*sin6))
 532                 return (EINVAL);
 533
 534         /*
 535          * Must disallow TCP ``connections'' to multicast addresses.
 536          */
 537         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 538                 return (EAFNOSUPPORT);
 539
 540         inp = sotoinpcb(so);
 541         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 542         INP_WLOCK(inp);
 543         vflagsav = inp->inp_vflag;
 544         incflagsav = inp->inp_inc.inc_flags;
 545         if (inp->inp_flags & INP_DROPPED) {
 546                 error = ECONNREFUSED;
 547                 goto out;
 548         }
 549         if (SOLISTENING(so)) {
 550                 error = EINVAL;
 551                 goto out;
 552         }
 553         tp = intotcpcb(inp);
 554 #ifdef INET
 555         /*
 556          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 557          * therefore probably require the hash lock, which isn't held here.
 558          * Is this a significant problem?
 559          */
 560         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 561                 struct sockaddr_in sin;
 562
 563                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 564                         error = EINVAL;
 565                         goto out;
 566                 }
 567                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 568                         error = EAFNOSUPPORT;
 569                         goto out;
 570                 }
 571
 572                 in6_sin6_2_sin(&sin, sin6);
 573                 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 574                         error = EAFNOSUPPORT;
 575                         goto out;
 576                 }
 577                 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) {
 578                         error = EACCES;
 579                         goto out;
 580                 }
 581                 if ((error = prison_remote_ip4(td->td_ucred,
 582                     &sin.sin_addr)) != 0)
 583                         goto out;
 584                 inp->inp_vflag |= INP_IPV4;
 585                 inp->inp_vflag &= ~INP_IPV6;
 586                 NET_EPOCH_ENTER(et);
 587                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 588                         goto out_in_epoch;
 589 #ifdef TCP_OFFLOAD
 590                 if (registered_toedevs > 0 &&
 591                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 592                     (error = tcp_offload_connect(so, nam)) == 0)
 593                         goto out_in_epoch;
 594 #endif
 595                 error = tcp_output(tp);
 596                 goto out_in_epoch;
 597         } else {
 598                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 599                         error = EAFNOSUPPORT;
 600                         goto out;
 601                 }
 602         }
 603 #endif
 604         if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
 605                 goto out;
 606         inp->inp_vflag &= ~INP_IPV4;
 607         inp->inp_vflag |= INP_IPV6;
 608         inp->inp_inc.inc_flags |= INC_ISIPV6;
 609         NET_EPOCH_ENTER(et);
 610         if ((error = tcp6_connect(tp, nam, td)) != 0)
 611                 goto out_in_epoch;
 612 #ifdef TCP_OFFLOAD
 613         if (registered_toedevs > 0 &&
 614             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 615             (error = tcp_offload_connect(so, nam)) == 0)
 616                 goto out_in_epoch;
 617 #endif
 618         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 619         error = tcp_output(tp);
 620 out_in_epoch:
 621         NET_EPOCH_EXIT(et);
 622 out:
 623         KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
 624             ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
 625         /*
 626          * If the implicit bind in the connect call fails, restore
 627          * the flags we modified.
 628          */
 629         if (error != 0 && inp->inp_lport == 0) {
 630                 inp->inp_vflag = vflagsav;
 631                 inp->inp_inc.inc_flags = incflagsav;
 632         }
 633
 634         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 635         INP_WUNLOCK(inp);
 636         return (error);
 637 }
 638 #endif /* INET6 */
 639
 640 /*
 641  * Initiate disconnect from peer.
 642  * If connection never passed embryonic stage, just drop;
 643  * else if don't need to let data drain, then can just drop anyways,
 644  * else have to begin TCP shutdown process: mark socket disconnecting,
 645  * drain unread data, state switch to reflect user close, and
 646  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 647  * when peer sends FIN and acks ours.
 648  *
 649  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 650  */
 651 static int
 652 tcp_usr_disconnect(struct socket *so)
 653 {
 654         struct inpcb *inp;
 655         struct tcpcb *tp = NULL;
 656         struct epoch_tracker et;
 657         int error = 0;
 658
 659         NET_EPOCH_ENTER(et);
 660         inp = sotoinpcb(so);
 661         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 662         INP_WLOCK(inp);
 663         if (inp->inp_flags & INP_DROPPED) {
 664                 error = ECONNRESET;
 665                 goto out;
 666         }
 667         tp = intotcpcb(inp);
 668         tcp_disconnect(tp);
 669 out:
 670         TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
 671         INP_WUNLOCK(inp);
 672         NET_EPOCH_EXIT(et);
 673         return (error);
 674 }
 675
 676 #ifdef INET
 677 /*
 678  * Accept a connection.  Essentially all the work is done at higher levels;
 679  * just return the address of the peer, storing through addr.
 680  */
 681 static int
 682 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 683 {
 684         int error = 0;
 685         struct inpcb *inp = NULL;
 686 #ifdef KDTRACE_HOOKS
 687         struct tcpcb *tp = NULL;
 688 #endif
 689         struct in_addr addr;
 690         in_port_t port = 0;
 691
 692         if (so->so_state & SS_ISDISCONNECTED)
 693                 return (ECONNABORTED);
 694
 695         inp = sotoinpcb(so);
 696         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 697         INP_WLOCK(inp);
 698         if (inp->inp_flags & INP_DROPPED) {
 699                 error = ECONNABORTED;
 700                 goto out;
 701         }
 702 #ifdef KDTRACE_HOOKS
 703         tp = intotcpcb(inp);
 704 #endif
 705
 706         /*
 707          * We inline in_getpeeraddr and COMMON_END here, so that we can
 708          * copy the data of interest and defer the malloc until after we
 709          * release the lock.
 710          */
 711         port = inp->inp_fport;
 712         addr = inp->inp_faddr;
 713
 714 out:
 715         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 716         INP_WUNLOCK(inp);
 717         if (error == 0)
 718                 *nam = in_sockaddr(port, &addr);
 719         return error;
 720 }
 721 #endif /* INET */
 722
 723 #ifdef INET6
 724 static int
 725 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 726 {
 727         struct inpcb *inp = NULL;
 728         int error = 0;
 729 #ifdef KDTRACE_HOOKS
 730         struct tcpcb *tp = NULL;
 731 #endif
 732         struct in_addr addr;
 733         struct in6_addr addr6;
 734         struct epoch_tracker et;
 735         in_port_t port = 0;
 736         int v4 = 0;
 737
 738         if (so->so_state & SS_ISDISCONNECTED)
 739                 return (ECONNABORTED);
 740
 741         inp = sotoinpcb(so);
 742         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 743         NET_EPOCH_ENTER(et);
 744         INP_WLOCK(inp);
 745         if (inp->inp_flags & INP_DROPPED) {
 746                 error = ECONNABORTED;
 747                 goto out;
 748         }
 749 #ifdef KDTRACE_HOOKS
 750         tp = intotcpcb(inp);
 751 #endif
 752
 753         /*
 754          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 755          * copy the data of interest and defer the malloc until after we
 756          * release the lock.
 757          */
 758         if (inp->inp_vflag & INP_IPV4) {
 759                 v4 = 1;
 760                 port = inp->inp_fport;
 761                 addr = inp->inp_faddr;
 762         } else {
 763                 port = inp->inp_fport;
 764                 addr6 = inp->in6p_faddr;
 765         }
 766
 767 out:
 768         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 769         INP_WUNLOCK(inp);
 770         NET_EPOCH_EXIT(et);
 771         if (error == 0) {
 772                 if (v4)
 773                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 774                 else
 775                         *nam = in6_sockaddr(port, &addr6);
 776         }
 777         return error;
 778 }
 779 #endif /* INET6 */
 780
 781 /*
 782  * Mark the connection as being incapable of further output.
 783  */
 784 static int
 785 tcp_usr_shutdown(struct socket *so)
 786 {
 787         int error = 0;
 788         struct inpcb *inp;
 789         struct tcpcb *tp = NULL;
 790         struct epoch_tracker et;
 791
 792         inp = sotoinpcb(so);
 793         KASSERT(inp != NULL, ("inp == NULL"));
 794         INP_WLOCK(inp);
 795         if (inp->inp_flags & INP_DROPPED) {
 796                 INP_WUNLOCK(inp);
 797                 return (ECONNRESET);
 798         }
 799         tp = intotcpcb(inp);
 800         NET_EPOCH_ENTER(et);
 801         socantsendmore(so);
 802         tcp_usrclosed(tp);
 803         if (!(inp->inp_flags & INP_DROPPED))
 804                 error = tcp_output_nodrop(tp);
 805         TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
 806         error = tcp_unlock_or_drop(tp, error);
 807         NET_EPOCH_EXIT(et);
 808
 809         return (error);
 810 }
 811
 812 /*
 813  * After a receive, possibly send window update to peer.
 814  */
 815 static int
 816 tcp_usr_rcvd(struct socket *so, int flags)
 817 {
 818         struct epoch_tracker et;
 819         struct inpcb *inp;
 820         struct tcpcb *tp = NULL;
 821         int outrv = 0, error = 0;
 822
 823         inp = sotoinpcb(so);
 824         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 825         INP_WLOCK(inp);
 826         if (inp->inp_flags & INP_DROPPED) {
 827                 INP_WUNLOCK(inp);
 828                 return (ECONNRESET);
 829         }
 830         tp = intotcpcb(inp);
 831         NET_EPOCH_ENTER(et);
 832         /*
 833          * For passively-created TFO connections, don't attempt a window
 834          * update while still in SYN_RECEIVED as this may trigger an early
 835          * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
 836          * application response data, or failing that, when the DELACK timer
 837          * expires.
 838          */
 839         if (IS_FASTOPEN(tp->t_flags) &&
 840             (tp->t_state == TCPS_SYN_RECEIVED))
 841                 goto out;
 842 #ifdef TCP_OFFLOAD
 843         if (tp->t_flags & TF_TOE)
 844                 tcp_offload_rcvd(tp);
 845         else
 846 #endif
 847                 outrv = tcp_output_nodrop(tp);
 848 out:
 849         TCP_PROBE2(debug__user, tp, PRU_RCVD);
 850         (void) tcp_unlock_or_drop(tp, outrv);
 851         NET_EPOCH_EXIT(et);
 852         return (error);
 853 }
 854
 855 /*
 856  * Do a send by putting data in output queue and updating urgent
 857  * marker if URG set.  Possibly send more data.  Unlike the other
 858  * pru_*() routines, the mbuf chains are our responsibility.  We
 859  * must either enqueue them or free them.  The other pru_* routines
 860  * generally are caller-frees.
 861  */
 862 static int
 863 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 864     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 865 {
 866         struct epoch_tracker et;
 867         int error = 0;
 868         struct inpcb *inp;
 869         struct tcpcb *tp = NULL;
 870 #ifdef INET
 871 #ifdef INET6
 872         struct sockaddr_in sin;
 873 #endif
 874         struct sockaddr_in *sinp;
 875 #endif
 876 #ifdef INET6
 877         int isipv6;
 878 #endif
 879         u_int8_t incflagsav;
 880         u_char vflagsav;
 881         bool restoreflags;
 882
 883         if (control != NULL) {
 884                 /* TCP doesn't do control messages (rights, creds, etc) */
 885                 if (control->m_len) {
 886                         m_freem(control);
 887                         return (EINVAL);
 888                 }
 889                 m_freem(control);       /* empty control, just free it */
 890         }
 891
 892         inp = sotoinpcb(so);
 893         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 894         INP_WLOCK(inp);
 895         if (inp->inp_flags & INP_DROPPED) {
 896                 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
 897                         m_freem(m);
 898                 INP_WUNLOCK(inp);
 899                 return (ECONNRESET);
 900         }
 901
 902         vflagsav = inp->inp_vflag;
 903         incflagsav = inp->inp_inc.inc_flags;
 904         restoreflags = false;
 905         tp = intotcpcb(inp);
 906
 907         NET_EPOCH_ENTER(et);
 908         if ((flags & PRUS_OOB) != 0 &&
 909             (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
 910                 goto out;
 911
 912         if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
 913                 if (tp->t_state == TCPS_LISTEN) {
 914                         error = EINVAL;
 915                         goto out;
 916                 }
 917                 switch (nam->sa_family) {
 918 #ifdef INET
 919                 case AF_INET:
 920                         sinp = (struct sockaddr_in *)nam;
 921                         if (sinp->sin_len != sizeof(struct sockaddr_in)) {
 922                                 error = EINVAL;
 923                                 goto out;
 924                         }
 925                         if ((inp->inp_vflag & INP_IPV6) != 0) {
 926                                 error = EAFNOSUPPORT;
 927                                 goto out;
 928                         }
 929                         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 930                                 error = EAFNOSUPPORT;
 931                                 goto out;
 932                         }
 933                         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
 934                                 error = EACCES;
 935                                 goto out;
 936                         }
 937                         if ((error = prison_remote_ip4(td->td_ucred,
 938                             &sinp->sin_addr)))
 939                                 goto out;
 940 #ifdef INET6
 941                         isipv6 = 0;
 942 #endif
 943                         break;
 944 #endif /* INET */
 945 #ifdef INET6
 946                 case AF_INET6:
 947                 {
 948                         struct sockaddr_in6 *sin6;
 949
 950                         sin6 = (struct sockaddr_in6 *)nam;
 951                         if (sin6->sin6_len != sizeof(*sin6)) {
 952                                 error = EINVAL;
 953                                 goto out;
 954                         }
 955                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
 956                                 error = EAFNOSUPPORT;
 957                                 goto out;
 958                         }
 959                         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 960                                 error = EAFNOSUPPORT;
 961                                 goto out;
 962                         }
 963                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 964 #ifdef INET
 965                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 966                                         error = EINVAL;
 967                                         goto out;
 968                                 }
 969                                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 970                                         error = EAFNOSUPPORT;
 971                                         goto out;
 972                                 }
 973                                 restoreflags = true;
 974                                 inp->inp_vflag &= ~INP_IPV6;
 975                                 sinp = &sin;
 976                                 in6_sin6_2_sin(sinp, sin6);
 977                                 if (IN_MULTICAST(
 978                                     ntohl(sinp->sin_addr.s_addr))) {
 979                                         error = EAFNOSUPPORT;
 980                                         goto out;
 981                                 }
 982                                 if ((error = prison_remote_ip4(td->td_ucred,
 983                                     &sinp->sin_addr)))
 984                                         goto out;
 985                                 isipv6 = 0;
 986 #else /* !INET */
 987                                 error = EAFNOSUPPORT;
 988                                 goto out;
 989 #endif /* INET */
 990                         } else {
 991                                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 992                                         error = EAFNOSUPPORT;
 993                                         goto out;
 994                                 }
 995                                 restoreflags = true;
 996                                 inp->inp_vflag &= ~INP_IPV4;
 997                                 inp->inp_inc.inc_flags |= INC_ISIPV6;
 998                                 if ((error = prison_remote_ip6(td->td_ucred,
 999                                     &sin6->sin6_addr)))
1000                                         goto out;
1001                                 isipv6 = 1;
1002                         }
1003                         break;
1004                 }
1005 #endif /* INET6 */
1006                 default:
1007                         error = EAFNOSUPPORT;
1008                         goto out;
1009                 }
1010         }
1011         if (!(flags & PRUS_OOB)) {
1012                 if (tp->t_acktime == 0)
1013                         tp->t_acktime = ticks;
1014                 sbappendstream(&so->so_snd, m, flags);
1015                 m = NULL;
1016                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1017                         KASSERT(tp->t_state == TCPS_CLOSED,
1018                             ("%s: tp %p is listening", __func__, tp));
1019
1020                         /*
1021                          * Do implied connect if not yet connected,
1022                          * initialize window to default value, and
1023                          * initialize maxseg using peer's cached MSS.
1024                          */
1025 #ifdef INET6
1026                         if (isipv6)
1027                                 error = tcp6_connect(tp, nam, td);
1028 #endif /* INET6 */
1029 #if defined(INET6) && defined(INET)
1030                         else
1031 #endif
1032 #ifdef INET
1033                                 error = tcp_connect(tp,
1034                                     (struct sockaddr *)sinp, td);
1035 #endif
1036                         /*
1037                          * The bind operation in tcp_connect succeeded. We
1038                          * no longer want to restore the flags if later
1039                          * operations fail.
1040                          */
1041                         if (error == 0 || inp->inp_lport != 0)
1042                                 restoreflags = false;
1043
1044                         if (error) {
1045                                 /* m is freed if PRUS_NOTREADY is unset. */
1046                                 sbflush(&so->so_snd);
1047                                 goto out;
1048                         }
1049                         if (IS_FASTOPEN(tp->t_flags))
1050                                 tcp_fastopen_connect(tp);
1051                         else {
1052                                 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1053                                 tcp_mss(tp, -1);
1054                         }
1055                 }
1056                 if (flags & PRUS_EOF) {
1057                         /*
1058                          * Close the send side of the connection after
1059                          * the data is sent.
1060                          */
1061                         socantsendmore(so);
1062                         tcp_usrclosed(tp);
1063                 }
1064                 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
1065                     ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
1066                     (tp->t_fbyte_out == 0) &&
1067                     (so->so_snd.sb_ccc > 0)) {
1068                         tp->t_fbyte_out = ticks;
1069                         if (tp->t_fbyte_out == 0)
1070                                 tp->t_fbyte_out = 1;
1071                         if (tp->t_fbyte_out && tp->t_fbyte_in)
1072                                 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
1073                 }
1074                 if (!(inp->inp_flags & INP_DROPPED) &&
1075                     !(flags & PRUS_NOTREADY)) {
1076                         if (flags & PRUS_MORETOCOME)
1077                                 tp->t_flags |= TF_MORETOCOME;
1078                         error = tcp_output_nodrop(tp);
1079                         if (flags & PRUS_MORETOCOME)
1080                                 tp->t_flags &= ~TF_MORETOCOME;
1081                 }
1082         } else {
1083                 /*
1084                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1085                  */
1086                 SOCKBUF_LOCK(&so->so_snd);
1087                 if (sbspace(&so->so_snd) < -512) {
1088                         SOCKBUF_UNLOCK(&so->so_snd);
1089                         error = ENOBUFS;
1090                         goto out;
1091                 }
1092                 /*
1093                  * According to RFC961 (Assigned Protocols),
1094                  * the urgent pointer points to the last octet
1095                  * of urgent data.  We continue, however,
1096                  * to consider it to indicate the first octet
1097                  * of data past the urgent section.
1098                  * Otherwise, snd_up should be one lower.
1099                  */
1100                 if (tp->t_acktime == 0)
1101                         tp->t_acktime = ticks;
1102                 sbappendstream_locked(&so->so_snd, m, flags);
1103                 SOCKBUF_UNLOCK(&so->so_snd);
1104                 m = NULL;
1105                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1106                         /*
1107                          * Do implied connect if not yet connected,
1108                          * initialize window to default value, and
1109                          * initialize maxseg using peer's cached MSS.
1110                          */
1111
1112                         /*
1113                          * Not going to contemplate SYN|URG
1114                          */
1115                         if (IS_FASTOPEN(tp->t_flags))
1116                                 tp->t_flags &= ~TF_FASTOPEN;
1117 #ifdef INET6
1118                         if (isipv6)
1119                                 error = tcp6_connect(tp, nam, td);
1120 #endif /* INET6 */
1121 #if defined(INET6) && defined(INET)
1122                         else
1123 #endif
1124 #ifdef INET
1125                                 error = tcp_connect(tp,
1126                                     (struct sockaddr *)sinp, td);
1127 #endif
1128                         /*
1129                          * The bind operation in tcp_connect succeeded. We
1130                          * no longer want to restore the flags if later
1131                          * operations fail.
1132                          */
1133                         if (error == 0 || inp->inp_lport != 0)
1134                                 restoreflags = false;
1135
1136                         if (error != 0) {
1137                                 /* m is freed if PRUS_NOTREADY is unset. */
1138                                 sbflush(&so->so_snd);
1139                                 goto out;
1140                         }
1141                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
1142                         tcp_mss(tp, -1);
1143                 }
1144                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1145                 if ((flags & PRUS_NOTREADY) == 0) {
1146                         tp->t_flags |= TF_FORCEDATA;
1147                         error = tcp_output_nodrop(tp);
1148                         tp->t_flags &= ~TF_FORCEDATA;
1149                 }
1150         }
1151         TCP_LOG_EVENT(tp, NULL,
1152             &inp->inp_socket->so_rcv,
1153             &inp->inp_socket->so_snd,
1154             TCP_LOG_USERSEND, error,
1155             0, NULL, false);
1156
1157 out:
1158         /*
1159          * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
1160          * responsible for freeing memory.
1161          */
1162         if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1163                 m_freem(m);
1164
1165         /*
1166          * If the request was unsuccessful and we changed flags,
1167          * restore the original flags.
1168          */
1169         if (error != 0 && restoreflags) {
1170                 inp->inp_vflag = vflagsav;
1171                 inp->inp_inc.inc_flags = incflagsav;
1172         }
1173         TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1174                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1175         error = tcp_unlock_or_drop(tp, error);
1176         NET_EPOCH_EXIT(et);
1177         return (error);
1178 }
1179
1180 static int
1181 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1182 {
1183         struct epoch_tracker et;
1184         struct inpcb *inp;
1185         struct tcpcb *tp;
1186         int error;
1187
1188         inp = sotoinpcb(so);
1189         INP_WLOCK(inp);
1190         if (inp->inp_flags & INP_DROPPED) {
1191                 INP_WUNLOCK(inp);
1192                 mb_free_notready(m, count);
1193                 return (ECONNRESET);
1194         }
1195         tp = intotcpcb(inp);
1196
1197         SOCKBUF_LOCK(&so->so_snd);
1198         error = sbready(&so->so_snd, m, count);
1199         SOCKBUF_UNLOCK(&so->so_snd);
1200         if (error) {
1201                 INP_WUNLOCK(inp);
1202                 return (error);
1203         }
1204         NET_EPOCH_ENTER(et);
1205         error = tcp_output_unlock(tp);
1206         NET_EPOCH_EXIT(et);
1207
1208         return (error);
1209 }
1210
1211 /*
1212  * Abort the TCP.  Drop the connection abruptly.
1213  */
1214 static void
1215 tcp_usr_abort(struct socket *so)
1216 {
1217         struct inpcb *inp;
1218         struct tcpcb *tp = NULL;
1219         struct epoch_tracker et;
1220
1221         inp = sotoinpcb(so);
1222         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1223
1224         NET_EPOCH_ENTER(et);
1225         INP_WLOCK(inp);
1226         KASSERT(inp->inp_socket != NULL,
1227             ("tcp_usr_abort: inp_socket == NULL"));
1228
1229         /*
1230          * If we still have full TCP state, and we're not dropped, drop.
1231          */
1232         if (!(inp->inp_flags & INP_DROPPED)) {
1233                 tp = intotcpcb(inp);
1234                 tp = tcp_drop(tp, ECONNABORTED);
1235                 if (tp == NULL)
1236                         goto dropped;
1237                 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1238         }
1239         if (!(inp->inp_flags & INP_DROPPED)) {
1240                 soref(so);
1241                 inp->inp_flags |= INP_SOCKREF;
1242         }
1243         INP_WUNLOCK(inp);
1244 dropped:
1245         NET_EPOCH_EXIT(et);
1246 }
1247
1248 /*
1249  * TCP socket is closed.  Start friendly disconnect.
1250  */
1251 static void
1252 tcp_usr_close(struct socket *so)
1253 {
1254         struct inpcb *inp;
1255         struct tcpcb *tp = NULL;
1256         struct epoch_tracker et;
1257
1258         inp = sotoinpcb(so);
1259         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1260
1261         NET_EPOCH_ENTER(et);
1262         INP_WLOCK(inp);
1263         KASSERT(inp->inp_socket != NULL,
1264             ("tcp_usr_close: inp_socket == NULL"));
1265
1266         /*
1267          * If we still have full TCP state, and we're not dropped, initiate
1268          * a disconnect.
1269          */
1270         if (!(inp->inp_flags & INP_DROPPED)) {
1271                 tp = intotcpcb(inp);
1272                 tp->t_flags |= TF_CLOSED;
1273                 tcp_disconnect(tp);
1274                 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1275         }
1276         if (!(inp->inp_flags & INP_DROPPED)) {
1277                 soref(so);
1278                 inp->inp_flags |= INP_SOCKREF;
1279         }
1280         INP_WUNLOCK(inp);
1281         NET_EPOCH_EXIT(et);
1282 }
1283
1284 static int
1285 tcp_pru_options_support(struct tcpcb *tp, int flags)
1286 {
1287         /*
1288          * If the specific TCP stack has a pru_options
1289          * specified then it does not always support
1290          * all the PRU_XX options and we must ask it.
1291          * If the function is not specified then all
1292          * of the PRU_XX options are supported.
1293          */
1294         int ret = 0;
1295
1296         if (tp->t_fb->tfb_pru_options) {
1297                 ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1298         }
1299         return (ret);
1300 }
1301
1302 /*
1303  * Receive out-of-band data.
1304  */
1305 static int
1306 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1307 {
1308         int error = 0;
1309         struct inpcb *inp;
1310         struct tcpcb *tp = NULL;
1311
1312         inp = sotoinpcb(so);
1313         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1314         INP_WLOCK(inp);
1315         if (inp->inp_flags & INP_DROPPED) {
1316                 error = ECONNRESET;
1317                 goto out;
1318         }
1319         tp = intotcpcb(inp);
1320         error = tcp_pru_options_support(tp, PRUS_OOB);
1321         if (error) {
1322                 goto out;
1323         }
1324         if ((so->so_oobmark == 0 &&
1325              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1326             so->so_options & SO_OOBINLINE ||
1327             tp->t_oobflags & TCPOOB_HADDATA) {
1328                 error = EINVAL;
1329                 goto out;
1330         }
1331         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1332                 error = EWOULDBLOCK;
1333                 goto out;
1334         }
1335         m->m_len = 1;
1336         *mtod(m, caddr_t) = tp->t_iobc;
1337         if ((flags & MSG_PEEK) == 0)
1338                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1339
1340 out:
1341         TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1342         INP_WUNLOCK(inp);
1343         return (error);
1344 }
1345
1346 #ifdef INET
1347 struct protosw tcp_protosw = {
1348         .pr_type =              SOCK_STREAM,
1349         .pr_protocol =          IPPROTO_TCP,
1350         .pr_flags =             PR_CONNREQUIRED | PR_IMPLOPCL | PR_WANTRCVD |
1351                                     PR_CAPATTACH,
1352         .pr_ctloutput =         tcp_ctloutput,
1353         .pr_abort =             tcp_usr_abort,
1354         .pr_accept =            tcp_usr_accept,
1355         .pr_attach =            tcp_usr_attach,
1356         .pr_bind =              tcp_usr_bind,
1357         .pr_connect =           tcp_usr_connect,
1358         .pr_control =           in_control,
1359         .pr_detach =            tcp_usr_detach,
1360         .pr_disconnect =        tcp_usr_disconnect,
1361         .pr_listen =            tcp_usr_listen,
1362         .pr_peeraddr =          in_getpeeraddr,
1363         .pr_rcvd =              tcp_usr_rcvd,
1364         .pr_rcvoob =            tcp_usr_rcvoob,
1365         .pr_send =              tcp_usr_send,
1366         .pr_ready =             tcp_usr_ready,
1367         .pr_shutdown =          tcp_usr_shutdown,
1368         .pr_sockaddr =          in_getsockaddr,
1369         .pr_sosetlabel =        in_pcbsosetlabel,
1370         .pr_close =             tcp_usr_close,
1371 };
1372 #endif /* INET */
1373
1374 #ifdef INET6
1375 struct protosw tcp6_protosw = {
1376         .pr_type =              SOCK_STREAM,
1377         .pr_protocol =          IPPROTO_TCP,
1378         .pr_flags =             PR_CONNREQUIRED | PR_IMPLOPCL |PR_WANTRCVD |
1379                                     PR_CAPATTACH,
1380         .pr_ctloutput =         tcp_ctloutput,
1381         .pr_abort =             tcp_usr_abort,
1382         .pr_accept =            tcp6_usr_accept,
1383         .pr_attach =            tcp_usr_attach,
1384         .pr_bind =              tcp6_usr_bind,
1385         .pr_connect =           tcp6_usr_connect,
1386         .pr_control =           in6_control,
1387         .pr_detach =            tcp_usr_detach,
1388         .pr_disconnect =        tcp_usr_disconnect,
1389         .pr_listen =            tcp6_usr_listen,
1390         .pr_peeraddr =          in6_mapped_peeraddr,
1391         .pr_rcvd =              tcp_usr_rcvd,
1392         .pr_rcvoob =            tcp_usr_rcvoob,
1393         .pr_send =              tcp_usr_send,
1394         .pr_ready =             tcp_usr_ready,
1395         .pr_shutdown =          tcp_usr_shutdown,
1396         .pr_sockaddr =          in6_mapped_sockaddr,
1397         .pr_sosetlabel =        in_pcbsosetlabel,
1398         .pr_close =             tcp_usr_close,
1399 };
1400 #endif /* INET6 */
1401
1402 #ifdef INET
1403 /*
1404  * Common subroutine to open a TCP connection to remote host specified
1405  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1406  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1407  * to choose a local host address (interface).  If there is an existing
1408  * incarnation of the same connection in TIME-WAIT state and if the remote
1409  * host was sending CC options and if the connection duration was < MSL, then
1410  * truncate the previous TIME-WAIT state and proceed.
1411  * Initialize connection parameters and enter SYN-SENT state.
1412  */
1413 static int
1414 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1415 {
1416         struct inpcb *inp = tptoinpcb(tp), *oinp;
1417         struct socket *so = tptosocket(tp);
1418         struct in_addr laddr;
1419         u_short lport;
1420         int error;
1421
1422         NET_EPOCH_ASSERT();
1423         INP_WLOCK_ASSERT(inp);
1424         INP_HASH_WLOCK(&V_tcbinfo);
1425
1426         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1427                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1428                 if (error)
1429                         goto out;
1430         }
1431
1432         /*
1433          * Cannot simply call in_pcbconnect, because there might be an
1434          * earlier incarnation of this same connection still in
1435          * TIME_WAIT state, creating an ADDRINUSE error.
1436          */
1437         laddr = inp->inp_laddr;
1438         lport = inp->inp_lport;
1439         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1440             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1441         if (error && oinp == NULL)
1442                 goto out;
1443         if (oinp) {
1444                 error = EADDRINUSE;
1445                 goto out;
1446         }
1447         /* Handle initial bind if it hadn't been done in advance. */
1448         if (inp->inp_lport == 0) {
1449                 inp->inp_lport = lport;
1450                 if (in_pcbinshash(inp) != 0) {
1451                         inp->inp_lport = 0;
1452                         error = EAGAIN;
1453                         goto out;
1454                 }
1455         }
1456         inp->inp_laddr = laddr;
1457         in_pcbrehash(inp);
1458         INP_HASH_WUNLOCK(&V_tcbinfo);
1459
1460         /*
1461          * Compute window scaling to request:
1462          * Scale to fit into sweet spot.  See tcp_syncache.c.
1463          * XXX: This should move to tcp_output().
1464          */
1465         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1466             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1467                 tp->request_r_scale++;
1468
1469         soisconnecting(so);
1470         TCPSTAT_INC(tcps_connattempt);
1471         tcp_state_change(tp, TCPS_SYN_SENT);
1472         tp->iss = tcp_new_isn(&inp->inp_inc);
1473         if (tp->t_flags & TF_REQ_TSTMP)
1474                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1475         tcp_sendseqinit(tp);
1476
1477         return 0;
1478
1479 out:
1480         INP_HASH_WUNLOCK(&V_tcbinfo);
1481         return (error);
1482 }
1483 #endif /* INET */
1484
1485 #ifdef INET6
1486 static int
1487 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1488 {
1489         struct inpcb *inp = tptoinpcb(tp);
1490         int error;
1491
1492         INP_WLOCK_ASSERT(inp);
1493         INP_HASH_WLOCK(&V_tcbinfo);
1494
1495         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1496                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1497                 if (error)
1498                         goto out;
1499         }
1500         error = in6_pcbconnect(inp, nam, td->td_ucred);
1501         if (error != 0)
1502                 goto out;
1503         INP_HASH_WUNLOCK(&V_tcbinfo);
1504
1505         /* Compute window scaling to request.  */
1506         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1507             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1508                 tp->request_r_scale++;
1509
1510         soisconnecting(inp->inp_socket);
1511         TCPSTAT_INC(tcps_connattempt);
1512         tcp_state_change(tp, TCPS_SYN_SENT);
1513         tp->iss = tcp_new_isn(&inp->inp_inc);
1514         if (tp->t_flags & TF_REQ_TSTMP)
1515                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1516         tcp_sendseqinit(tp);
1517
1518         return 0;
1519
1520 out:
1521         INP_HASH_WUNLOCK(&V_tcbinfo);
1522         return error;
1523 }
1524 #endif /* INET6 */
1525
1526 /*
1527  * Export TCP internal state information via a struct tcp_info, based on the
1528  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1529  * (TCP state machine, etc).  We export all information using FreeBSD-native
1530  * constants -- for example, the numeric values for tcpi_state will differ
1531  * from Linux.
1532  */
1533 static void
1534 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1535 {
1536
1537         INP_WLOCK_ASSERT(tptoinpcb(tp));
1538         bzero(ti, sizeof(*ti));
1539
1540         ti->tcpi_state = tp->t_state;
1541         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1542                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1543         if (tp->t_flags & TF_SACK_PERMIT)
1544                 ti->tcpi_options |= TCPI_OPT_SACK;
1545         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1546                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1547                 ti->tcpi_snd_wscale = tp->snd_scale;
1548                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1549         }
1550         if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
1551                 ti->tcpi_options |= TCPI_OPT_ECN;
1552
1553         ti->tcpi_rto = tp->t_rxtcur * tick;
1554         ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1555         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1556         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1557
1558         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1559         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1560
1561         /*
1562          * FreeBSD-specific extension fields for tcp_info.
1563          */
1564         ti->tcpi_rcv_space = tp->rcv_wnd;
1565         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1566         ti->tcpi_snd_wnd = tp->snd_wnd;
1567         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1568         ti->tcpi_snd_nxt = tp->snd_nxt;
1569         ti->tcpi_snd_mss = tp->t_maxseg;
1570         ti->tcpi_rcv_mss = tp->t_maxseg;
1571         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1572         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1573         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1574 #ifdef TCP_OFFLOAD
1575         if (tp->t_flags & TF_TOE) {
1576                 ti->tcpi_options |= TCPI_OPT_TOE;
1577                 tcp_offload_tcp_info(tp, ti);
1578         }
1579 #endif
1580         /*
1581          * AccECN related counters.
1582          */
1583         if ((tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) ==
1584             (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
1585                 /*
1586                  * Internal counter starts at 5 for AccECN
1587                  * but 0 for RFC3168 ECN.
1588                  */
1589                 ti->tcpi_delivered_ce = tp->t_scep - 5;
1590         else
1591                 ti->tcpi_delivered_ce = tp->t_scep;
1592         ti->tcpi_received_ce = tp->t_rcep;
1593 }
1594
1595 /*
1596  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1597  * socket option arguments.  When it re-acquires the lock after the copy, it
1598  * has to revalidate that the connection is still valid for the socket
1599  * option.
1600  */
1601 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do {                    \
1602         INP_WLOCK(inp);                                                 \
1603         if (inp->inp_flags & INP_DROPPED) {                             \
1604                 INP_WUNLOCK(inp);                                       \
1605                 cleanup;                                                \
1606                 return (ECONNRESET);                                    \
1607         }                                                               \
1608         tp = intotcpcb(inp);                                            \
1609 } while(0)
1610 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1611
1612 int
1613 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt)
1614 {
1615         struct socket *so = inp->inp_socket;
1616         struct tcpcb *tp = intotcpcb(inp);
1617         int error = 0;
1618
1619         MPASS(sopt->sopt_dir == SOPT_SET);
1620         INP_WLOCK_ASSERT(inp);
1621         KASSERT((inp->inp_flags & INP_DROPPED) == 0,
1622             ("inp_flags == %x", inp->inp_flags));
1623         KASSERT(so != NULL, ("inp_socket == NULL"));
1624
1625         if (sopt->sopt_level != IPPROTO_TCP) {
1626                 INP_WUNLOCK(inp);
1627 #ifdef INET6
1628                 if (inp->inp_vflag & INP_IPV6PROTO)
1629                         error = ip6_ctloutput(so, sopt);
1630 #endif
1631 #if defined(INET6) && defined(INET)
1632                 else
1633 #endif
1634 #ifdef INET
1635                         error = ip_ctloutput(so, sopt);
1636 #endif
1637                 /*
1638                  * When an IP-level socket option affects TCP, pass control
1639                  * down to stack tfb_tcp_ctloutput, otherwise return what
1640                  * IP level returned.
1641                  */
1642                 switch (sopt->sopt_level) {
1643 #ifdef INET6
1644                 case IPPROTO_IPV6:
1645                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
1646                                 return (error);
1647                         switch (sopt->sopt_name) {
1648                         case IPV6_TCLASS:
1649                                 /* Notify tcp stacks that care (e.g. RACK). */
1650                                 break;
1651                         case IPV6_USE_MIN_MTU:
1652                                 /* Update t_maxseg accordingly. */
1653                                 break;
1654                         default:
1655                                 return (error);
1656                         }
1657                         break;
1658 #endif
1659 #ifdef INET
1660                 case IPPROTO_IP:
1661                         switch (sopt->sopt_name) {
1662                         case IP_TOS:
1663                                 inp->inp_ip_tos &= ~IPTOS_ECN_MASK;
1664                                 break;
1665                         case IP_TTL:
1666                                 /* Notify tcp stacks that care (e.g. RACK). */
1667                                 break;
1668                         default:
1669                                 return (error);
1670                         }
1671                         break;
1672 #endif
1673                 default:
1674                         return (error);
1675                 }
1676                 INP_WLOCK(inp);
1677                 if (inp->inp_flags & INP_DROPPED) {
1678                         INP_WUNLOCK(inp);
1679                         return (ECONNRESET);
1680                 }
1681         } else if (sopt->sopt_name == TCP_FUNCTION_BLK) {
1682                 /*
1683                  * Protect the TCP option TCP_FUNCTION_BLK so
1684                  * that a sub-function can *never* overwrite this.
1685                  */
1686                 struct tcp_function_set fsn;
1687                 struct tcp_function_block *blk;
1688
1689                 INP_WUNLOCK(inp);
1690                 error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn);
1691                 if (error)
1692                         return (error);
1693
1694                 INP_WLOCK(inp);
1695                 if (inp->inp_flags & INP_DROPPED) {
1696                         INP_WUNLOCK(inp);
1697                         return (ECONNRESET);
1698                 }
1699                 tp = intotcpcb(inp);
1700
1701                 blk = find_and_ref_tcp_functions(&fsn);
1702                 if (blk == NULL) {
1703                         INP_WUNLOCK(inp);
1704                         return (ENOENT);
1705                 }
1706                 if (tp->t_fb == blk) {
1707                         /* You already have this */
1708                         refcount_release(&blk->tfb_refcnt);
1709                         INP_WUNLOCK(inp);
1710                         return (0);
1711                 }
1712                 if (tp->t_state != TCPS_CLOSED) {
1713                         /*
1714                          * The user has advanced the state
1715                          * past the initial point, we may not
1716                          * be able to switch.
1717                          */
1718                         if (blk->tfb_tcp_handoff_ok != NULL) {
1719                                 /*
1720                                  * Does the stack provide a
1721                                  * query mechanism, if so it may
1722                                  * still be possible?
1723                                  */
1724                                 error = (*blk->tfb_tcp_handoff_ok)(tp);
1725                         } else
1726                                 error = EINVAL;
1727                         if (error) {
1728                                 refcount_release(&blk->tfb_refcnt);
1729                                 INP_WUNLOCK(inp);
1730                                 return(error);
1731                         }
1732                 }
1733                 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1734                         refcount_release(&blk->tfb_refcnt);
1735                         INP_WUNLOCK(inp);
1736                         return (ENOENT);
1737                 }
1738                 /*
1739                  * Release the old refcnt, the
1740                  * lookup acquired a ref on the
1741                  * new one already.
1742                  */
1743                 if (tp->t_fb->tfb_tcp_fb_fini) {
1744                         struct epoch_tracker et;
1745                         /*
1746                          * Tell the stack to cleanup with 0 i.e.
1747                          * the tcb is not going away.
1748                          */
1749                         NET_EPOCH_ENTER(et);
1750                         (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1751                         NET_EPOCH_EXIT(et);
1752                 }
1753 #ifdef TCPHPTS
1754                 /* Assure that we are not on any hpts */
1755                 tcp_hpts_remove(tptoinpcb(tp));
1756 #endif
1757                 if (blk->tfb_tcp_fb_init) {
1758                         error = (*blk->tfb_tcp_fb_init)(tp);
1759                         if (error) {
1760                                 refcount_release(&blk->tfb_refcnt);
1761                                 if (tp->t_fb->tfb_tcp_fb_init) {
1762                                         if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0)  {
1763                                                 /* Fall back failed, drop the connection */
1764                                                 INP_WUNLOCK(inp);
1765                                                 soabort(so);
1766                                                 return (error);
1767                                         }
1768                                 }
1769                                 goto err_out;
1770                         }
1771                 }
1772                 refcount_release(&tp->t_fb->tfb_refcnt);
1773                 tp->t_fb = blk;
1774 #ifdef TCP_OFFLOAD
1775                 if (tp->t_flags & TF_TOE) {
1776                         tcp_offload_ctloutput(tp, sopt->sopt_dir,
1777                              sopt->sopt_name);
1778                 }
1779 #endif
1780 err_out:
1781                 INP_WUNLOCK(inp);
1782                 return (error);
1783         }
1784
1785         /* Pass in the INP locked, callee must unlock it. */
1786         return (tp->t_fb->tfb_tcp_ctloutput(inp, sopt));
1787 }
1788
1789 static int
1790 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt)
1791 {
1792         struct socket *so = inp->inp_socket;
1793         struct tcpcb *tp = intotcpcb(inp);
1794         int error = 0;
1795
1796         MPASS(sopt->sopt_dir == SOPT_GET);
1797         INP_WLOCK_ASSERT(inp);
1798         KASSERT((inp->inp_flags & INP_DROPPED) == 0,
1799             ("inp_flags == %x", inp->inp_flags));
1800         KASSERT(so != NULL, ("inp_socket == NULL"));
1801
1802         if (sopt->sopt_level != IPPROTO_TCP) {
1803                 INP_WUNLOCK(inp);
1804 #ifdef INET6
1805                 if (inp->inp_vflag & INP_IPV6PROTO)
1806                         error = ip6_ctloutput(so, sopt);
1807 #endif /* INET6 */
1808 #if defined(INET6) && defined(INET)
1809                 else
1810 #endif
1811 #ifdef INET
1812                         error = ip_ctloutput(so, sopt);
1813 #endif
1814                 return (error);
1815         }
1816         if (((sopt->sopt_name == TCP_FUNCTION_BLK) ||
1817              (sopt->sopt_name == TCP_FUNCTION_ALIAS))) {
1818                 struct tcp_function_set fsn;
1819
1820                 if (sopt->sopt_name == TCP_FUNCTION_ALIAS) {
1821                         memset(&fsn, 0, sizeof(fsn));
1822                         find_tcp_function_alias(tp->t_fb, &fsn);
1823                 } else {
1824                         strncpy(fsn.function_set_name,
1825                             tp->t_fb->tfb_tcp_block_name,
1826                             TCP_FUNCTION_NAME_LEN_MAX);
1827                         fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1828                 }
1829                 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1830                 INP_WUNLOCK(inp);
1831                 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1832                 return (error);
1833         }
1834
1835         /* Pass in the INP locked, callee must unlock it. */
1836         return (tp->t_fb->tfb_tcp_ctloutput(inp, sopt));
1837 }
1838
1839 int
1840 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1841 {
1842         struct  inpcb *inp;
1843
1844         inp = sotoinpcb(so);
1845         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1846
1847         INP_WLOCK(inp);
1848         if (inp->inp_flags & INP_DROPPED) {
1849                 INP_WUNLOCK(inp);
1850                 return (ECONNRESET);
1851         }
1852         if (sopt->sopt_dir == SOPT_SET)
1853                 return (tcp_ctloutput_set(inp, sopt));
1854         else if (sopt->sopt_dir == SOPT_GET)
1855                 return (tcp_ctloutput_get(inp, sopt));
1856         else
1857                 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
1858 }
1859
1860 /*
1861  * If this assert becomes untrue, we need to change the size of the buf
1862  * variable in tcp_default_ctloutput().
1863  */
1864 #ifdef CTASSERT
1865 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1866 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1867 #endif
1868
1869 #ifdef KERN_TLS
1870 static int
1871 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
1872 {
1873         struct tls_enable_v0 tls_v0;
1874         int error;
1875
1876         if (sopt->sopt_valsize == sizeof(tls_v0)) {
1877                 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
1878                     sizeof(tls_v0));
1879                 if (error)
1880                         return (error);
1881                 memset(tls, 0, sizeof(*tls));
1882                 tls->cipher_key = tls_v0.cipher_key;
1883                 tls->iv = tls_v0.iv;
1884                 tls->auth_key = tls_v0.auth_key;
1885                 tls->cipher_algorithm = tls_v0.cipher_algorithm;
1886                 tls->cipher_key_len = tls_v0.cipher_key_len;
1887                 tls->iv_len = tls_v0.iv_len;
1888                 tls->auth_algorithm = tls_v0.auth_algorithm;
1889                 tls->auth_key_len = tls_v0.auth_key_len;
1890                 tls->flags = tls_v0.flags;
1891                 tls->tls_vmajor = tls_v0.tls_vmajor;
1892                 tls->tls_vminor = tls_v0.tls_vminor;
1893                 return (0);
1894         }
1895
1896         return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
1897 }
1898 #endif
1899
1900 extern struct cc_algo newreno_cc_algo;
1901
1902 static int
1903 tcp_set_cc_mod(struct inpcb *inp, struct sockopt *sopt)
1904 {
1905         struct cc_algo *algo;
1906         void *ptr = NULL;
1907         struct tcpcb *tp;
1908         struct cc_var cc_mem;
1909         char    buf[TCP_CA_NAME_MAX];
1910         size_t mem_sz;
1911         int error;
1912
1913         INP_WUNLOCK(inp);
1914         error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
1915         if (error)
1916                 return(error);
1917         buf[sopt->sopt_valsize] = '\0';
1918         CC_LIST_RLOCK();
1919         STAILQ_FOREACH(algo, &cc_list, entries) {
1920                 if (strncmp(buf, algo->name,
1921                             TCP_CA_NAME_MAX) == 0) {
1922                         if (algo->flags & CC_MODULE_BEING_REMOVED) {
1923                                 /* We can't "see" modules being unloaded */
1924                                 continue;
1925                         }
1926                         break;
1927                 }
1928         }
1929         if (algo == NULL) {
1930                 CC_LIST_RUNLOCK();
1931                 return(ESRCH);
1932         }
1933         /*
1934          * With a reference the algorithm cannot be removed
1935          * so we hold a reference through the change process.
1936          */
1937         cc_refer(algo);
1938         CC_LIST_RUNLOCK();
1939         if (algo->cb_init != NULL) {
1940                 /* We can now pre-get the memory for the CC */
1941                 mem_sz = (*algo->cc_data_sz)();
1942                 if (mem_sz == 0) {
1943                         goto no_mem_needed;
1944                 }
1945                 ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK);
1946         } else {
1947 no_mem_needed:
1948                 mem_sz = 0;
1949                 ptr = NULL;
1950         }
1951         /*
1952          * Make sure its all clean and zero and also get
1953          * back the inplock.
1954          */
1955         memset(&cc_mem, 0, sizeof(cc_mem));
1956         INP_WLOCK(inp);
1957         if (inp->inp_flags & INP_DROPPED) {
1958                 INP_WUNLOCK(inp);
1959                 if (ptr)
1960                         free(ptr, M_CC_MEM);
1961                 /* Release our temp reference */
1962                 CC_LIST_RLOCK();
1963                 cc_release(algo);
1964                 CC_LIST_RUNLOCK();
1965                 return (ECONNRESET);
1966         }
1967         tp = intotcpcb(inp);
1968         if (ptr != NULL)
1969                 memset(ptr, 0, mem_sz);
1970         cc_mem.ccvc.tcp = tp;
1971         /*
1972          * We once again hold a write lock over the tcb so it's
1973          * safe to do these things without ordering concerns.
1974          * Note here we init into stack memory.
1975          */
1976         if (algo->cb_init != NULL)
1977                 error = algo->cb_init(&cc_mem, ptr);
1978         else
1979                 error = 0;
1980         /*
1981          * The CC algorithms, when given their memory
1982          * should not fail we could in theory have a
1983          * KASSERT here.
1984          */
1985         if (error == 0) {
1986                 /*
1987                  * Touchdown, lets go ahead and move the
1988                  * connection to the new CC module by
1989                  * copying in the cc_mem after we call
1990                  * the old ones cleanup (if any).
1991                  */
1992                 if (CC_ALGO(tp)->cb_destroy != NULL)
1993                         CC_ALGO(tp)->cb_destroy(&tp->t_ccv);
1994                 /* Detach the old CC from the tcpcb  */
1995                 cc_detach(tp);
1996                 /* Copy in our temp memory that was inited */
1997                 memcpy(&tp->t_ccv, &cc_mem, sizeof(struct cc_var));
1998                 /* Now attach the new, which takes a reference */
1999                 cc_attach(tp, algo);
2000                 /* Ok now are we where we have gotten past any conn_init? */
2001                 if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) {
2002                         /* Yep run the connection init for the new CC */
2003                         CC_ALGO(tp)->conn_init(&tp->t_ccv);
2004                 }
2005         } else if (ptr)
2006                 free(ptr, M_CC_MEM);
2007         INP_WUNLOCK(inp);
2008         /* Now lets release our temp reference */
2009         CC_LIST_RLOCK();
2010         cc_release(algo);
2011         CC_LIST_RUNLOCK();
2012         return (error);
2013 }
2014
2015 int
2016 tcp_default_ctloutput(struct inpcb *inp, struct sockopt *sopt)
2017 {
2018         struct tcpcb *tp = intotcpcb(inp);
2019         int     error, opt, optval;
2020         u_int   ui;
2021         struct  tcp_info ti;
2022 #ifdef KERN_TLS
2023         struct tls_enable tls;
2024         struct socket *so = inp->inp_socket;
2025 #endif
2026         char    *pbuf, buf[TCP_LOG_ID_LEN];
2027 #ifdef STATS
2028         struct statsblob *sbp;
2029 #endif
2030         size_t  len;
2031
2032         INP_WLOCK_ASSERT(inp);
2033         KASSERT((inp->inp_flags & INP_DROPPED) == 0,
2034             ("inp_flags == %x", inp->inp_flags));
2035         KASSERT(inp->inp_socket != NULL, ("inp_socket == NULL"));
2036
2037         switch (sopt->sopt_level) {
2038 #ifdef INET6
2039         case IPPROTO_IPV6:
2040                 MPASS(inp->inp_vflag & INP_IPV6PROTO);
2041                 switch (sopt->sopt_name) {
2042                 case IPV6_USE_MIN_MTU:
2043                         tcp6_use_min_mtu(tp);
2044                         /* FALLTHROUGH */
2045                 }
2046                 INP_WUNLOCK(inp);
2047                 return (0);
2048 #endif
2049 #ifdef INET
2050         case IPPROTO_IP:
2051                 INP_WUNLOCK(inp);
2052                 return (0);
2053 #endif
2054         }
2055
2056         /*
2057          * For TCP_CCALGOOPT forward the control to CC module, for both
2058          * SOPT_SET and SOPT_GET.
2059          */
2060         switch (sopt->sopt_name) {
2061         case TCP_CCALGOOPT:
2062                 INP_WUNLOCK(inp);
2063                 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
2064                         return (EINVAL);
2065                 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
2066                 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
2067                     sopt->sopt_valsize);
2068                 if (error) {
2069                         free(pbuf, M_TEMP);
2070                         return (error);
2071                 }
2072                 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
2073                 if (CC_ALGO(tp)->ctl_output != NULL)
2074                         error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, sopt, pbuf);
2075                 else
2076                         error = ENOENT;
2077                 INP_WUNLOCK(inp);
2078                 if (error == 0 && sopt->sopt_dir == SOPT_GET)
2079                         error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
2080                 free(pbuf, M_TEMP);
2081                 return (error);
2082         }
2083
2084         switch (sopt->sopt_dir) {
2085         case SOPT_SET:
2086                 switch (sopt->sopt_name) {
2087 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2088                 case TCP_MD5SIG:
2089                         INP_WUNLOCK(inp);
2090                         if (!TCPMD5_ENABLED())
2091                                 return (ENOPROTOOPT);
2092                         error = TCPMD5_PCBCTL(inp, sopt);
2093                         if (error)
2094                                 return (error);
2095                         INP_WLOCK_RECHECK(inp);
2096                         goto unlock_and_done;
2097 #endif /* IPSEC */
2098
2099                 case TCP_NODELAY:
2100                 case TCP_NOOPT:
2101                 case TCP_LRD:
2102                         INP_WUNLOCK(inp);
2103                         error = sooptcopyin(sopt, &optval, sizeof optval,
2104                             sizeof optval);
2105                         if (error)
2106                                 return (error);
2107
2108                         INP_WLOCK_RECHECK(inp);
2109                         switch (sopt->sopt_name) {
2110                         case TCP_NODELAY:
2111                                 opt = TF_NODELAY;
2112                                 break;
2113                         case TCP_NOOPT:
2114                                 opt = TF_NOOPT;
2115                                 break;
2116                         case TCP_LRD:
2117                                 opt = TF_LRD;
2118                                 break;
2119                         default:
2120                                 opt = 0; /* dead code to fool gcc */
2121                                 break;
2122                         }
2123
2124                         if (optval)
2125                                 tp->t_flags |= opt;
2126                         else
2127                                 tp->t_flags &= ~opt;
2128 unlock_and_done:
2129 #ifdef TCP_OFFLOAD
2130                         if (tp->t_flags & TF_TOE) {
2131                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
2132                                     sopt->sopt_name);
2133                         }
2134 #endif
2135                         INP_WUNLOCK(inp);
2136                         break;
2137
2138                 case TCP_NOPUSH:
2139                         INP_WUNLOCK(inp);
2140                         error = sooptcopyin(sopt, &optval, sizeof optval,
2141                             sizeof optval);
2142                         if (error)
2143                                 return (error);
2144
2145                         INP_WLOCK_RECHECK(inp);
2146                         if (optval)
2147                                 tp->t_flags |= TF_NOPUSH;
2148                         else if (tp->t_flags & TF_NOPUSH) {
2149                                 tp->t_flags &= ~TF_NOPUSH;
2150                                 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2151                                         struct epoch_tracker et;
2152
2153                                         NET_EPOCH_ENTER(et);
2154                                         error = tcp_output_nodrop(tp);
2155                                         NET_EPOCH_EXIT(et);
2156                                 }
2157                         }
2158                         goto unlock_and_done;
2159
2160                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2161                         INP_WUNLOCK(inp);
2162                         error = sooptcopyin(sopt, &optval, sizeof optval,
2163                             sizeof optval);
2164                         if (error)
2165                                 return (error);
2166                         if ((optval < TCP_TUNNELING_PORT_MIN) ||
2167                             (optval > TCP_TUNNELING_PORT_MAX)) {
2168                                 /* Its got to be in range */
2169                                 return (EINVAL);
2170                         }
2171                         if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
2172                                 /* You have to have enabled a UDP tunneling port first */
2173                                 return (EINVAL);
2174                         }
2175                         INP_WLOCK_RECHECK(inp);
2176                         if (tp->t_state != TCPS_CLOSED) {
2177                                 /* You can't change after you are connected */
2178                                 error = EINVAL;
2179                         } else {
2180                                 /* Ok we are all good set the port */
2181                                 tp->t_port = htons(optval);
2182                         }
2183                         goto unlock_and_done;
2184
2185                 case TCP_MAXSEG:
2186                         INP_WUNLOCK(inp);
2187                         error = sooptcopyin(sopt, &optval, sizeof optval,
2188                             sizeof optval);
2189                         if (error)
2190                                 return (error);
2191
2192                         INP_WLOCK_RECHECK(inp);
2193                         if (optval > 0 && optval <= tp->t_maxseg &&
2194                             optval + 40 >= V_tcp_minmss)
2195                                 tp->t_maxseg = optval;
2196                         else
2197                                 error = EINVAL;
2198                         goto unlock_and_done;
2199
2200                 case TCP_INFO:
2201                         INP_WUNLOCK(inp);
2202                         error = EINVAL;
2203                         break;
2204
2205                 case TCP_STATS:
2206                         INP_WUNLOCK(inp);
2207 #ifdef STATS
2208                         error = sooptcopyin(sopt, &optval, sizeof optval,
2209                             sizeof optval);
2210                         if (error)
2211                                 return (error);
2212
2213                         if (optval > 0)
2214                                 sbp = stats_blob_alloc(
2215                                     V_tcp_perconn_stats_dflt_tpl, 0);
2216                         else
2217                                 sbp = NULL;
2218
2219                         INP_WLOCK_RECHECK(inp);
2220                         if ((tp->t_stats != NULL && sbp == NULL) ||
2221                             (tp->t_stats == NULL && sbp != NULL)) {
2222                                 struct statsblob *t = tp->t_stats;
2223                                 tp->t_stats = sbp;
2224                                 sbp = t;
2225                         }
2226                         INP_WUNLOCK(inp);
2227
2228                         stats_blob_destroy(sbp);
2229 #else
2230                         return (EOPNOTSUPP);
2231 #endif /* !STATS */
2232                         break;
2233
2234                 case TCP_CONGESTION:
2235                         error = tcp_set_cc_mod(inp, sopt);
2236                         break;
2237
2238                 case TCP_REUSPORT_LB_NUMA:
2239                         INP_WUNLOCK(inp);
2240                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2241                             sizeof(optval));
2242                         INP_WLOCK_RECHECK(inp);
2243                         if (!error)
2244                                 error = in_pcblbgroup_numa(inp, optval);
2245                         INP_WUNLOCK(inp);
2246                         break;
2247
2248 #ifdef KERN_TLS
2249                 case TCP_TXTLS_ENABLE:
2250                         INP_WUNLOCK(inp);
2251                         error = copyin_tls_enable(sopt, &tls);
2252                         if (error)
2253                                 break;
2254                         error = ktls_enable_tx(so, &tls);
2255                         break;
2256                 case TCP_TXTLS_MODE:
2257                         INP_WUNLOCK(inp);
2258                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2259                         if (error)
2260                                 return (error);
2261
2262                         INP_WLOCK_RECHECK(inp);
2263                         error = ktls_set_tx_mode(so, ui);
2264                         INP_WUNLOCK(inp);
2265                         break;
2266                 case TCP_RXTLS_ENABLE:
2267                         INP_WUNLOCK(inp);
2268                         error = sooptcopyin(sopt, &tls, sizeof(tls),
2269                             sizeof(tls));
2270                         if (error)
2271                                 break;
2272                         error = ktls_enable_rx(so, &tls);
2273                         break;
2274 #endif
2275                 case TCP_MAXUNACKTIME:
2276                 case TCP_KEEPIDLE:
2277                 case TCP_KEEPINTVL:
2278                 case TCP_KEEPINIT:
2279                         INP_WUNLOCK(inp);
2280                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2281                         if (error)
2282                                 return (error);
2283
2284                         if (ui > (UINT_MAX / hz)) {
2285                                 error = EINVAL;
2286                                 break;
2287                         }
2288                         ui *= hz;
2289
2290                         INP_WLOCK_RECHECK(inp);
2291                         switch (sopt->sopt_name) {
2292                         case TCP_MAXUNACKTIME:
2293                                 tp->t_maxunacktime = ui;
2294                                 break;
2295
2296                         case TCP_KEEPIDLE:
2297                                 tp->t_keepidle = ui;
2298                                 /*
2299                                  * XXX: better check current remaining
2300                                  * timeout and "merge" it with new value.
2301                                  */
2302                                 if ((tp->t_state > TCPS_LISTEN) &&
2303                                     (tp->t_state <= TCPS_CLOSING))
2304                                         tcp_timer_activate(tp, TT_KEEP,
2305                                             TP_KEEPIDLE(tp));
2306                                 break;
2307                         case TCP_KEEPINTVL:
2308                                 tp->t_keepintvl = ui;
2309                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2310                                     (TP_MAXIDLE(tp) > 0))
2311                                         tcp_timer_activate(tp, TT_2MSL,
2312                                             TP_MAXIDLE(tp));
2313                                 break;
2314                         case TCP_KEEPINIT:
2315                                 tp->t_keepinit = ui;
2316                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
2317                                     tp->t_state == TCPS_SYN_SENT)
2318                                         tcp_timer_activate(tp, TT_KEEP,
2319                                             TP_KEEPINIT(tp));
2320                                 break;
2321                         }
2322                         goto unlock_and_done;
2323
2324                 case TCP_KEEPCNT:
2325                         INP_WUNLOCK(inp);
2326                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2327                         if (error)
2328                                 return (error);
2329
2330                         INP_WLOCK_RECHECK(inp);
2331                         tp->t_keepcnt = ui;
2332                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2333                             (TP_MAXIDLE(tp) > 0))
2334                                 tcp_timer_activate(tp, TT_2MSL,
2335                                     TP_MAXIDLE(tp));
2336                         goto unlock_and_done;
2337
2338 #ifdef TCPPCAP
2339                 case TCP_PCAP_OUT:
2340                 case TCP_PCAP_IN:
2341                         INP_WUNLOCK(inp);
2342                         error = sooptcopyin(sopt, &optval, sizeof optval,
2343                             sizeof optval);
2344                         if (error)
2345                                 return (error);
2346
2347                         INP_WLOCK_RECHECK(inp);
2348                         if (optval >= 0)
2349                                 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2350                                         &(tp->t_outpkts) : &(tp->t_inpkts),
2351                                         optval);
2352                         else
2353                                 error = EINVAL;
2354                         goto unlock_and_done;
2355 #endif
2356
2357                 case TCP_FASTOPEN: {
2358                         struct tcp_fastopen tfo_optval;
2359
2360                         INP_WUNLOCK(inp);
2361                         if (!V_tcp_fastopen_client_enable &&
2362                             !V_tcp_fastopen_server_enable)
2363                                 return (EPERM);
2364
2365                         error = sooptcopyin(sopt, &tfo_optval,
2366                                     sizeof(tfo_optval), sizeof(int));
2367                         if (error)
2368                                 return (error);
2369
2370                         INP_WLOCK_RECHECK(inp);
2371                         if ((tp->t_state != TCPS_CLOSED) &&
2372                             (tp->t_state != TCPS_LISTEN)) {
2373                                 error = EINVAL;
2374                                 goto unlock_and_done;
2375                         }
2376                         if (tfo_optval.enable) {
2377                                 if (tp->t_state == TCPS_LISTEN) {
2378                                         if (!V_tcp_fastopen_server_enable) {
2379                                                 error = EPERM;
2380                                                 goto unlock_and_done;
2381                                         }
2382
2383                                         if (tp->t_tfo_pending == NULL)
2384                                                 tp->t_tfo_pending =
2385                                                     tcp_fastopen_alloc_counter();
2386                                 } else {
2387                                         /*
2388                                          * If a pre-shared key was provided,
2389                                          * stash it in the client cookie
2390                                          * field of the tcpcb for use during
2391                                          * connect.
2392                                          */
2393                                         if (sopt->sopt_valsize ==
2394                                             sizeof(tfo_optval)) {
2395                                                 memcpy(tp->t_tfo_cookie.client,
2396                                                        tfo_optval.psk,
2397                                                        TCP_FASTOPEN_PSK_LEN);
2398                                                 tp->t_tfo_client_cookie_len =
2399                                                     TCP_FASTOPEN_PSK_LEN;
2400                                         }
2401                                 }
2402                                 tp->t_flags |= TF_FASTOPEN;
2403                         } else
2404                                 tp->t_flags &= ~TF_FASTOPEN;
2405                         goto unlock_and_done;
2406                 }
2407
2408 #ifdef TCP_BLACKBOX
2409                 case TCP_LOG:
2410                         INP_WUNLOCK(inp);
2411                         error = sooptcopyin(sopt, &optval, sizeof optval,
2412                             sizeof optval);
2413                         if (error)
2414                                 return (error);
2415
2416                         INP_WLOCK_RECHECK(inp);
2417                         error = tcp_log_state_change(tp, optval);
2418                         goto unlock_and_done;
2419
2420                 case TCP_LOGBUF:
2421                         INP_WUNLOCK(inp);
2422                         error = EINVAL;
2423                         break;
2424
2425                 case TCP_LOGID:
2426                         INP_WUNLOCK(inp);
2427                         error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2428                         if (error)
2429                                 break;
2430                         buf[sopt->sopt_valsize] = '\0';
2431                         INP_WLOCK_RECHECK(inp);
2432                         error = tcp_log_set_id(tp, buf);
2433                         /* tcp_log_set_id() unlocks the INP. */
2434                         break;
2435
2436                 case TCP_LOGDUMP:
2437                 case TCP_LOGDUMPID:
2438                         INP_WUNLOCK(inp);
2439                         error =
2440                             sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2441                         if (error)
2442                                 break;
2443                         buf[sopt->sopt_valsize] = '\0';
2444                         INP_WLOCK_RECHECK(inp);
2445                         if (sopt->sopt_name == TCP_LOGDUMP) {
2446                                 error = tcp_log_dump_tp_logbuf(tp, buf,
2447                                     M_WAITOK, true);
2448                                 INP_WUNLOCK(inp);
2449                         } else {
2450                                 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2451                                 /*
2452                                  * tcp_log_dump_tp_bucket_logbufs() drops the
2453                                  * INP lock.
2454                                  */
2455                         }
2456                         break;
2457 #endif
2458
2459                 default:
2460                         INP_WUNLOCK(inp);
2461                         error = ENOPROTOOPT;
2462                         break;
2463                 }
2464                 break;
2465
2466         case SOPT_GET:
2467                 tp = intotcpcb(inp);
2468                 switch (sopt->sopt_name) {
2469 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2470                 case TCP_MD5SIG:
2471                         INP_WUNLOCK(inp);
2472                         if (!TCPMD5_ENABLED())
2473                                 return (ENOPROTOOPT);
2474                         error = TCPMD5_PCBCTL(inp, sopt);
2475                         break;
2476 #endif
2477
2478                 case TCP_NODELAY:
2479                         optval = tp->t_flags & TF_NODELAY;
2480                         INP_WUNLOCK(inp);
2481                         error = sooptcopyout(sopt, &optval, sizeof optval);
2482                         break;
2483                 case TCP_MAXSEG:
2484                         optval = tp->t_maxseg;
2485                         INP_WUNLOCK(inp);
2486                         error = sooptcopyout(sopt, &optval, sizeof optval);
2487                         break;
2488                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2489                         optval = ntohs(tp->t_port);
2490                         INP_WUNLOCK(inp);
2491                         error = sooptcopyout(sopt, &optval, sizeof optval);
2492                         break;
2493                 case TCP_NOOPT:
2494                         optval = tp->t_flags & TF_NOOPT;
2495                         INP_WUNLOCK(inp);
2496                         error = sooptcopyout(sopt, &optval, sizeof optval);
2497                         break;
2498                 case TCP_NOPUSH:
2499                         optval = tp->t_flags & TF_NOPUSH;
2500                         INP_WUNLOCK(inp);
2501                         error = sooptcopyout(sopt, &optval, sizeof optval);
2502                         break;
2503                 case TCP_INFO:
2504                         tcp_fill_info(tp, &ti);
2505                         INP_WUNLOCK(inp);
2506                         error = sooptcopyout(sopt, &ti, sizeof ti);
2507                         break;
2508                 case TCP_STATS:
2509                         {
2510 #ifdef STATS
2511                         int nheld;
2512                         TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2513
2514                         error = 0;
2515                         socklen_t outsbsz = sopt->sopt_valsize;
2516                         if (tp->t_stats == NULL)
2517                                 error = ENOENT;
2518                         else if (outsbsz >= tp->t_stats->cursz)
2519                                 outsbsz = tp->t_stats->cursz;
2520                         else if (outsbsz >= sizeof(struct statsblob))
2521                                 outsbsz = sizeof(struct statsblob);
2522                         else
2523                                 error = EINVAL;
2524                         INP_WUNLOCK(inp);
2525                         if (error)
2526                                 break;
2527
2528                         sbp = sopt->sopt_val;
2529                         nheld = atop(round_page(((vm_offset_t)sbp) +
2530                             (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2531                         vm_page_t ma[nheld];
2532                         if (vm_fault_quick_hold_pages(
2533                             &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2534                             outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2535                             nheld) < 0) {
2536                                 error = EFAULT;
2537                                 break;
2538                         }
2539
2540                         if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2541                             SIZEOF_MEMBER(struct statsblob, flags))))
2542                                 goto unhold;
2543
2544                         INP_WLOCK_RECHECK(inp);
2545                         error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2546                             sbflags | SB_CLONE_USRDSTNOFAULT);
2547                         INP_WUNLOCK(inp);
2548                         sopt->sopt_valsize = outsbsz;
2549 unhold:
2550                         vm_page_unhold_pages(ma, nheld);
2551 #else
2552                         INP_WUNLOCK(inp);
2553                         error = EOPNOTSUPP;
2554 #endif /* !STATS */
2555                         break;
2556                         }
2557                 case TCP_CONGESTION:
2558                         len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2559                         INP_WUNLOCK(inp);
2560                         error = sooptcopyout(sopt, buf, len + 1);
2561                         break;
2562                 case TCP_MAXUNACKTIME:
2563                 case TCP_KEEPIDLE:
2564                 case TCP_KEEPINTVL:
2565                 case TCP_KEEPINIT:
2566                 case TCP_KEEPCNT:
2567                         switch (sopt->sopt_name) {
2568                         case TCP_MAXUNACKTIME:
2569                                 ui = TP_MAXUNACKTIME(tp) / hz;
2570                                 break;
2571                         case TCP_KEEPIDLE:
2572                                 ui = TP_KEEPIDLE(tp) / hz;
2573                                 break;
2574                         case TCP_KEEPINTVL:
2575                                 ui = TP_KEEPINTVL(tp) / hz;
2576                                 break;
2577                         case TCP_KEEPINIT:
2578                                 ui = TP_KEEPINIT(tp) / hz;
2579                                 break;
2580                         case TCP_KEEPCNT:
2581                                 ui = TP_KEEPCNT(tp);
2582                                 break;
2583                         }
2584                         INP_WUNLOCK(inp);
2585                         error = sooptcopyout(sopt, &ui, sizeof(ui));
2586                         break;
2587 #ifdef TCPPCAP
2588                 case TCP_PCAP_OUT:
2589                 case TCP_PCAP_IN:
2590                         optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2591                                         &(tp->t_outpkts) : &(tp->t_inpkts));
2592                         INP_WUNLOCK(inp);
2593                         error = sooptcopyout(sopt, &optval, sizeof optval);
2594                         break;
2595 #endif
2596                 case TCP_FASTOPEN:
2597                         optval = tp->t_flags & TF_FASTOPEN;
2598                         INP_WUNLOCK(inp);
2599                         error = sooptcopyout(sopt, &optval, sizeof optval);
2600                         break;
2601 #ifdef TCP_BLACKBOX
2602                 case TCP_LOG:
2603                         optval = tp->t_logstate;
2604                         INP_WUNLOCK(inp);
2605                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2606                         break;
2607                 case TCP_LOGBUF:
2608                         /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2609                         error = tcp_log_getlogbuf(sopt, tp);
2610                         break;
2611                 case TCP_LOGID:
2612                         len = tcp_log_get_id(tp, buf);
2613                         INP_WUNLOCK(inp);
2614                         error = sooptcopyout(sopt, buf, len + 1);
2615                         break;
2616                 case TCP_LOGDUMP:
2617                 case TCP_LOGDUMPID:
2618                         INP_WUNLOCK(inp);
2619                         error = EINVAL;
2620                         break;
2621 #endif
2622 #ifdef KERN_TLS
2623                 case TCP_TXTLS_MODE:
2624                         error = ktls_get_tx_mode(so, &optval);
2625                         INP_WUNLOCK(inp);
2626                         if (error == 0)
2627                                 error = sooptcopyout(sopt, &optval,
2628                                     sizeof(optval));
2629                         break;
2630                 case TCP_RXTLS_MODE:
2631                         error = ktls_get_rx_mode(so, &optval);
2632                         INP_WUNLOCK(inp);
2633                         if (error == 0)
2634                                 error = sooptcopyout(sopt, &optval,
2635                                     sizeof(optval));
2636                         break;
2637 #endif
2638                 case TCP_LRD:
2639                         optval = tp->t_flags & TF_LRD;
2640                         INP_WUNLOCK(inp);
2641                         error = sooptcopyout(sopt, &optval, sizeof optval);
2642                         break;
2643                 default:
2644                         INP_WUNLOCK(inp);
2645                         error = ENOPROTOOPT;
2646                         break;
2647                 }
2648                 break;
2649         }
2650         return (error);
2651 }
2652 #undef INP_WLOCK_RECHECK
2653 #undef INP_WLOCK_RECHECK_CLEANUP
2654
2655 /*
2656  * Initiate (or continue) disconnect.
2657  * If embryonic state, just send reset (once).
2658  * If in ``let data drain'' option and linger null, just drop.
2659  * Otherwise (hard), mark socket disconnecting and drop
2660  * current input data; switch states based on user close, and
2661  * send segment to peer (with FIN).
2662  */
2663 static void
2664 tcp_disconnect(struct tcpcb *tp)
2665 {
2666         struct inpcb *inp = tptoinpcb(tp);
2667         struct socket *so = tptosocket(tp);
2668
2669         NET_EPOCH_ASSERT();
2670         INP_WLOCK_ASSERT(inp);
2671
2672         /*
2673          * Neither tcp_close() nor tcp_drop() should return NULL, as the
2674          * socket is still open.
2675          */
2676         if (tp->t_state < TCPS_ESTABLISHED &&
2677             !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2678                 tp = tcp_close(tp);
2679                 KASSERT(tp != NULL,
2680                     ("tcp_disconnect: tcp_close() returned NULL"));
2681         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2682                 tp = tcp_drop(tp, 0);
2683                 KASSERT(tp != NULL,
2684                     ("tcp_disconnect: tcp_drop() returned NULL"));
2685         } else {
2686                 soisdisconnecting(so);
2687                 sbflush(&so->so_rcv);
2688                 tcp_usrclosed(tp);
2689                 if (!(inp->inp_flags & INP_DROPPED))
2690                         /* Ignore stack's drop request, we already at it. */
2691                         (void)tcp_output_nodrop(tp);
2692         }
2693 }
2694
2695 /*
2696  * User issued close, and wish to trail through shutdown states:
2697  * if never received SYN, just forget it.  If got a SYN from peer,
2698  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2699  * If already got a FIN from peer, then almost done; go to LAST_ACK
2700  * state.  In all other cases, have already sent FIN to peer (e.g.
2701  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2702  * for peer to send FIN or not respond to keep-alives, etc.
2703  * We can let the user exit from the close as soon as the FIN is acked.
2704  */
2705 static void
2706 tcp_usrclosed(struct tcpcb *tp)
2707 {
2708
2709         NET_EPOCH_ASSERT();
2710         INP_WLOCK_ASSERT(tptoinpcb(tp));
2711
2712         switch (tp->t_state) {
2713         case TCPS_LISTEN:
2714 #ifdef TCP_OFFLOAD
2715                 tcp_offload_listen_stop(tp);
2716 #endif
2717                 tcp_state_change(tp, TCPS_CLOSED);
2718                 /* FALLTHROUGH */
2719         case TCPS_CLOSED:
2720                 tp = tcp_close(tp);
2721                 /*
2722                  * tcp_close() should never return NULL here as the socket is
2723                  * still open.
2724                  */
2725                 KASSERT(tp != NULL,
2726                     ("tcp_usrclosed: tcp_close() returned NULL"));
2727                 break;
2728
2729         case TCPS_SYN_SENT:
2730         case TCPS_SYN_RECEIVED:
2731                 tp->t_flags |= TF_NEEDFIN;
2732                 break;
2733
2734         case TCPS_ESTABLISHED:
2735                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2736                 break;
2737
2738         case TCPS_CLOSE_WAIT:
2739                 tcp_state_change(tp, TCPS_LAST_ACK);
2740                 break;
2741         }
2742         if (tp->t_acktime == 0)
2743                 tp->t_acktime = ticks;
2744         if (tp->t_state >= TCPS_FIN_WAIT_2) {
2745                 soisdisconnected(tptosocket(tp));
2746                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2747                 if (tp->t_state == TCPS_FIN_WAIT_2) {
2748                         int timeout;
2749
2750                         timeout = (tcp_fast_finwait2_recycle) ?
2751                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
2752                         tcp_timer_activate(tp, TT_2MSL, timeout);
2753                 }
2754         }
2755 }
2756
2757 #ifdef DDB
2758 static void
2759 db_print_indent(int indent)
2760 {
2761         int i;
2762
2763         for (i = 0; i < indent; i++)
2764                 db_printf(" ");
2765 }
2766
2767 static void
2768 db_print_tstate(int t_state)
2769 {
2770
2771         switch (t_state) {
2772         case TCPS_CLOSED:
2773                 db_printf("TCPS_CLOSED");
2774                 return;
2775
2776         case TCPS_LISTEN:
2777                 db_printf("TCPS_LISTEN");
2778                 return;
2779
2780         case TCPS_SYN_SENT:
2781                 db_printf("TCPS_SYN_SENT");
2782                 return;
2783
2784         case TCPS_SYN_RECEIVED:
2785                 db_printf("TCPS_SYN_RECEIVED");
2786                 return;
2787
2788         case TCPS_ESTABLISHED:
2789                 db_printf("TCPS_ESTABLISHED");
2790                 return;
2791
2792         case TCPS_CLOSE_WAIT:
2793                 db_printf("TCPS_CLOSE_WAIT");
2794                 return;
2795
2796         case TCPS_FIN_WAIT_1:
2797                 db_printf("TCPS_FIN_WAIT_1");
2798                 return;
2799
2800         case TCPS_CLOSING:
2801                 db_printf("TCPS_CLOSING");
2802                 return;
2803
2804         case TCPS_LAST_ACK:
2805                 db_printf("TCPS_LAST_ACK");
2806                 return;
2807
2808         case TCPS_FIN_WAIT_2:
2809                 db_printf("TCPS_FIN_WAIT_2");
2810                 return;
2811
2812         case TCPS_TIME_WAIT:
2813                 db_printf("TCPS_TIME_WAIT");
2814                 return;
2815
2816         default:
2817                 db_printf("unknown");
2818                 return;
2819         }
2820 }
2821
2822 static void
2823 db_print_tflags(u_int t_flags)
2824 {
2825         int comma;
2826
2827         comma = 0;
2828         if (t_flags & TF_ACKNOW) {
2829                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2830                 comma = 1;
2831         }
2832         if (t_flags & TF_DELACK) {
2833                 db_printf("%sTF_DELACK", comma ? ", " : "");
2834                 comma = 1;
2835         }
2836         if (t_flags & TF_NODELAY) {
2837                 db_printf("%sTF_NODELAY", comma ? ", " : "");
2838                 comma = 1;
2839         }
2840         if (t_flags & TF_NOOPT) {
2841                 db_printf("%sTF_NOOPT", comma ? ", " : "");
2842                 comma = 1;
2843         }
2844         if (t_flags & TF_SENTFIN) {
2845                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2846                 comma = 1;
2847         }
2848         if (t_flags & TF_REQ_SCALE) {
2849                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2850                 comma = 1;
2851         }
2852         if (t_flags & TF_RCVD_SCALE) {
2853                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2854                 comma = 1;
2855         }
2856         if (t_flags & TF_REQ_TSTMP) {
2857                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2858                 comma = 1;
2859         }
2860         if (t_flags & TF_RCVD_TSTMP) {
2861                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2862                 comma = 1;
2863         }
2864         if (t_flags & TF_SACK_PERMIT) {
2865                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2866                 comma = 1;
2867         }
2868         if (t_flags & TF_NEEDSYN) {
2869                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2870                 comma = 1;
2871         }
2872         if (t_flags & TF_NEEDFIN) {
2873                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2874                 comma = 1;
2875         }
2876         if (t_flags & TF_NOPUSH) {
2877                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2878                 comma = 1;
2879         }
2880         if (t_flags & TF_PREVVALID) {
2881                 db_printf("%sTF_PREVVALID", comma ? ", " : "");
2882                 comma = 1;
2883         }
2884         if (t_flags & TF_MORETOCOME) {
2885                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2886                 comma = 1;
2887         }
2888         if (t_flags & TF_SONOTCONN) {
2889                 db_printf("%sTF_SONOTCONN", comma ? ", " : "");
2890                 comma = 1;
2891         }
2892         if (t_flags & TF_LASTIDLE) {
2893                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2894                 comma = 1;
2895         }
2896         if (t_flags & TF_RXWIN0SENT) {
2897                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2898                 comma = 1;
2899         }
2900         if (t_flags & TF_FASTRECOVERY) {
2901                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2902                 comma = 1;
2903         }
2904         if (t_flags & TF_CONGRECOVERY) {
2905                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2906                 comma = 1;
2907         }
2908         if (t_flags & TF_WASFRECOVERY) {
2909                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2910                 comma = 1;
2911         }
2912         if (t_flags & TF_WASCRECOVERY) {
2913                 db_printf("%sTF_WASCRECOVERY", comma ? ", " : "");
2914                 comma = 1;
2915         }
2916         if (t_flags & TF_SIGNATURE) {
2917                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2918                 comma = 1;
2919         }
2920         if (t_flags & TF_FORCEDATA) {
2921                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2922                 comma = 1;
2923         }
2924         if (t_flags & TF_TSO) {
2925                 db_printf("%sTF_TSO", comma ? ", " : "");
2926                 comma = 1;
2927         }
2928         if (t_flags & TF_FASTOPEN) {
2929                 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2930                 comma = 1;
2931         }
2932 }
2933
2934 static void
2935 db_print_tflags2(u_int t_flags2)
2936 {
2937         int comma;
2938
2939         comma = 0;
2940         if (t_flags2 & TF2_PLPMTU_BLACKHOLE) {
2941                 db_printf("%sTF2_PLPMTU_BLACKHOLE", comma ? ", " : "");
2942                 comma = 1;
2943         }
2944         if (t_flags2 & TF2_PLPMTU_PMTUD) {
2945                 db_printf("%sTF2_PLPMTU_PMTUD", comma ? ", " : "");
2946                 comma = 1;
2947         }
2948         if (t_flags2 & TF2_PLPMTU_MAXSEGSNT) {
2949                 db_printf("%sTF2_PLPMTU_MAXSEGSNT", comma ? ", " : "");
2950                 comma = 1;
2951         }
2952         if (t_flags2 & TF2_LOG_AUTO) {
2953                 db_printf("%sTF2_LOG_AUTO", comma ? ", " : "");
2954                 comma = 1;
2955         }
2956         if (t_flags2 & TF2_DROP_AF_DATA) {
2957                 db_printf("%sTF2_DROP_AF_DATA", comma ? ", " : "");
2958                 comma = 1;
2959         }
2960         if (t_flags2 & TF2_ECN_PERMIT) {
2961                 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
2962                 comma = 1;
2963         }
2964         if (t_flags2 & TF2_ECN_SND_CWR) {
2965                 db_printf("%sTF2_ECN_SND_CWR", comma ? ", " : "");
2966                 comma = 1;
2967         }
2968         if (t_flags2 & TF2_ECN_SND_ECE) {
2969                 db_printf("%sTF2_ECN_SND_ECE", comma ? ", " : "");
2970                 comma = 1;
2971         }
2972         if (t_flags2 & TF2_ACE_PERMIT) {
2973                 db_printf("%sTF2_ACE_PERMIT", comma ? ", " : "");
2974                 comma = 1;
2975         }
2976         if (t_flags2 & TF2_FBYTES_COMPLETE) {
2977                 db_printf("%sTF2_FBYTES_COMPLETE", comma ? ", " : "");
2978                 comma = 1;
2979         }
2980 }
2981
2982 static void
2983 db_print_toobflags(char t_oobflags)
2984 {
2985         int comma;
2986
2987         comma = 0;
2988         if (t_oobflags & TCPOOB_HAVEDATA) {
2989                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
2990                 comma = 1;
2991         }
2992         if (t_oobflags & TCPOOB_HADDATA) {
2993                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
2994                 comma = 1;
2995         }
2996 }
2997
2998 static void
2999 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
3000 {
3001
3002         db_print_indent(indent);
3003         db_printf("%s at %p\n", name, tp);
3004
3005         indent += 2;
3006
3007         db_print_indent(indent);
3008         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
3009            TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
3010
3011         db_print_indent(indent);
3012         db_printf("t_callout: %p   t_timers: %p\n",
3013             &tp->t_callout, &tp->t_timers);
3014
3015         db_print_indent(indent);
3016         db_printf("t_state: %d (", tp->t_state);
3017         db_print_tstate(tp->t_state);
3018         db_printf(")\n");
3019
3020         db_print_indent(indent);
3021         db_printf("t_flags: 0x%x (", tp->t_flags);
3022         db_print_tflags(tp->t_flags);
3023         db_printf(")\n");
3024
3025         db_print_indent(indent);
3026         db_printf("t_flags2: 0x%x (", tp->t_flags2);
3027         db_print_tflags2(tp->t_flags2);
3028         db_printf(")\n");
3029
3030         db_print_indent(indent);
3031         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
3032             tp->snd_una, tp->snd_max, tp->snd_nxt);
3033
3034         db_print_indent(indent);
3035         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
3036            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
3037
3038         db_print_indent(indent);
3039         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
3040             tp->iss, tp->irs, tp->rcv_nxt);
3041
3042         db_print_indent(indent);
3043         db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
3044             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
3045
3046         db_print_indent(indent);
3047         db_printf("snd_wnd: %u   snd_cwnd: %u\n",
3048            tp->snd_wnd, tp->snd_cwnd);
3049
3050         db_print_indent(indent);
3051         db_printf("snd_ssthresh: %u   snd_recover: "
3052             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
3053
3054         db_print_indent(indent);
3055         db_printf("t_rcvtime: %u   t_startime: %u\n",
3056             tp->t_rcvtime, tp->t_starttime);
3057
3058         db_print_indent(indent);
3059         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
3060             tp->t_rtttime, tp->t_rtseq);
3061
3062         db_print_indent(indent);
3063         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
3064             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
3065
3066         db_print_indent(indent);
3067         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u\n",
3068             tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin);
3069
3070         db_print_indent(indent);
3071         db_printf("t_rttupdated: %lu   max_sndwnd: %u   t_softerror: %d\n",
3072             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
3073
3074         db_print_indent(indent);
3075         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
3076         db_print_toobflags(tp->t_oobflags);
3077         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
3078
3079         db_print_indent(indent);
3080         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
3081             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
3082
3083         db_print_indent(indent);
3084         db_printf("ts_recent: %u   ts_recent_age: %u\n",
3085             tp->ts_recent, tp->ts_recent_age);
3086
3087         db_print_indent(indent);
3088         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
3089             "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
3090
3091         db_print_indent(indent);
3092         db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
3093             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
3094             tp->snd_recover_prev, tp->t_badrxtwin);
3095
3096         db_print_indent(indent);
3097         db_printf("snd_numholes: %d  snd_holes first: %p\n",
3098             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
3099
3100         db_print_indent(indent);
3101         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d\n",
3102             tp->snd_fack, tp->rcv_numsacks);
3103
3104         /* Skip sackblks, sackhint. */
3105
3106         db_print_indent(indent);
3107         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
3108             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
3109 }
3110
3111 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
3112 {
3113         struct tcpcb *tp;
3114
3115         if (!have_addr) {
3116                 db_printf("usage: show tcpcb <addr>\n");
3117                 return;
3118         }
3119         tp = (struct tcpcb *)addr;
3120
3121         db_print_tcpcb(tp, "tcpcb", 0);
3122 }
3123 #endif