sys/netinet/tcp_usrreq.c

   1 /*
   2  * Copyright (c) 2003, 2004 Jeffrey M. Hsu.  All rights reserved.
   3  * Copyright (c) 2003, 2004 The DragonFly Project.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to The DragonFly Project
   6  * by Jeffrey M. Hsu.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of The DragonFly Project nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific, prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1988, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      From: @(#)tcp_usrreq.c  8.2 (Berkeley) 1/3/94
  67  * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
  68  */
  69
  70 #include "opt_ipsec.h"
  71 #include "opt_inet.h"
  72 #include "opt_inet6.h"
  73 #include "opt_tcpdebug.h"
  74
  75 #include <sys/param.h>
  76 #include <sys/systm.h>
  77 #include <sys/kernel.h>
  78 #include <sys/malloc.h>
  79 #include <sys/sysctl.h>
  80 #include <sys/globaldata.h>
  81 #include <sys/thread.h>
  82
  83 #include <sys/mbuf.h>
  84 #ifdef INET6
  85 #include <sys/domain.h>
  86 #endif /* INET6 */
  87 #include <sys/socket.h>
  88 #include <sys/socketvar.h>
  89 #include <sys/socketops.h>
  90 #include <sys/protosw.h>
  91
  92 #include <sys/thread2.h>
  93 #include <sys/msgport2.h>
  94 #include <sys/socketvar2.h>
  95
  96 #include <net/if.h>
  97 #include <net/netisr.h>
  98 #include <net/route.h>
  99
 100 #include <net/netmsg2.h>
 101
 102 #include <netinet/in.h>
 103 #include <netinet/in_systm.h>
 104 #ifdef INET6
 105 #include <netinet/ip6.h>
 106 #endif
 107 #include <netinet/in_pcb.h>
 108 #ifdef INET6
 109 #include <netinet6/in6_pcb.h>
 110 #endif
 111 #include <netinet/in_var.h>
 112 #include <netinet/ip_var.h>
 113 #ifdef INET6
 114 #include <netinet6/ip6_var.h>
 115 #include <netinet6/tcp6_var.h>
 116 #endif
 117 #include <netinet/tcp.h>
 118 #include <netinet/tcp_fsm.h>
 119 #include <netinet/tcp_seq.h>
 120 #include <netinet/tcp_timer.h>
 121 #include <netinet/tcp_timer2.h>
 122 #include <netinet/tcp_var.h>
 123 #include <netinet/tcpip.h>
 124 #ifdef TCPDEBUG
 125 #include <netinet/tcp_debug.h>
 126 #endif
 127
 128 #ifdef IPSEC
 129 #include <netinet6/ipsec.h>
 130 #endif /*IPSEC*/
 131
 132 /*
 133  * TCP protocol interface to socket abstraction.
 134  */
 135 extern  char *tcpstates[];      /* XXX ??? */
 136
 137 static int      tcp_attach (struct socket *, struct pru_attach_info *);
 138 static void     tcp_connect (netmsg_t msg);
 139 #ifdef INET6
 140 static void     tcp6_connect (netmsg_t msg);
 141 static int      tcp6_connect_oncpu(struct tcpcb *tp, int flags,
 142                                 struct mbuf **mp,
 143                                 struct sockaddr_in6 *sin6,
 144                                 struct in6_addr *addr6);
 145 #endif /* INET6 */
 146 static struct tcpcb *
 147                 tcp_disconnect (struct tcpcb *);
 148 static struct tcpcb *
 149                 tcp_usrclosed (struct tcpcb *);
 150
 151 #ifdef TCPDEBUG
 152 #define TCPDEBUG0       int ostate = 0
 153 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 154 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 155                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 156 #else
 157 #define TCPDEBUG0
 158 #define TCPDEBUG1()
 159 #define TCPDEBUG2(req)
 160 #endif
 161
 162 static int      tcp_lport_extension = 1;
 163 SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
 164     &tcp_lport_extension, 0, "");
 165
 166 /*
 167  * For some ill optimized programs, which try to use TCP_NOPUSH
 168  * to improve performance, will have small amount of data sits
 169  * in the sending buffer.  These small amount of data will _not_
 170  * be pushed into the network until more data are written into
 171  * the socket or the socket write side is shutdown.
 172  */
 173 static int      tcp_disable_nopush = 1;
 174 SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW,
 175     &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect");
 176
 177 /*
 178  * TCP attaches to socket via pru_attach(), reserving space,
 179  * and an internet control block.  This is likely occuring on
 180  * cpu0 and may have to move later when we bind/connect.
 181  */
 182 static void
 183 tcp_usr_attach(netmsg_t msg)
 184 {
 185         struct socket *so = msg->base.nm_so;
 186         struct pru_attach_info *ai = msg->attach.nm_ai;
 187         int error;
 188         struct inpcb *inp;
 189         struct tcpcb *tp = NULL;
 190         TCPDEBUG0;
 191
 192         soreference(so);
 193         inp = so->so_pcb;
 194         TCPDEBUG1();
 195         if (inp) {
 196                 error = EISCONN;
 197                 goto out;
 198         }
 199
 200         error = tcp_attach(so, ai);
 201         if (error)
 202                 goto out;
 203
 204         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 205                 so->so_linger = TCP_LINGERTIME;
 206         tp = sototcpcb(so);
 207 out:
 208         sofree(so);             /* from ref above */
 209         TCPDEBUG2(PRU_ATTACH);
 210         lwkt_replymsg(&msg->lmsg, error);
 211 }
 212
 213 /*
 214  * pru_detach() detaches the TCP protocol from the socket.
 215  * If the protocol state is non-embryonic, then can't
 216  * do this directly: have to initiate a pru_disconnect(),
 217  * which may finish later; embryonic TCB's can just
 218  * be discarded here.
 219  */
 220 static void
 221 tcp_usr_detach(netmsg_t msg)
 222 {
 223         struct socket *so = msg->base.nm_so;
 224         int error = 0;
 225         struct inpcb *inp;
 226         struct tcpcb *tp;
 227         TCPDEBUG0;
 228
 229         inp = so->so_pcb;
 230
 231         /*
 232          * If the inp is already detached it may have been due to an async
 233          * close.  Just return as if no error occured.
 234          *
 235          * It's possible for the tcpcb (tp) to disconnect from the inp due
 236          * to tcp_drop()->tcp_close() being called.  This may occur *after*
 237          * the detach message has been queued so we may find a NULL tp here.
 238          */
 239         if (inp) {
 240                 if ((tp = intotcpcb(inp)) != NULL) {
 241                         TCPDEBUG1();
 242                         tp = tcp_disconnect(tp);
 243                         TCPDEBUG2(PRU_DETACH);
 244                 }
 245         }
 246         lwkt_replymsg(&msg->lmsg, error);
 247 }
 248
 249 /*
 250  * NOTE: ignore_error is non-zero for certain disconnection races
 251  * which we want to silently allow, otherwise close() may return
 252  * an unexpected error.
 253  *
 254  * NOTE: The variables (msg) and (tp) are assumed.
 255  */
 256 #define COMMON_START(so, inp, ignore_error)                     \
 257         TCPDEBUG0;                                              \
 258                                                                 \
 259         inp = so->so_pcb;                                       \
 260         do {                                                    \
 261                  if (inp == NULL) {                             \
 262                         error = ignore_error ? 0 : EINVAL;      \
 263                         tp = NULL;                              \
 264                         goto out;                               \
 265                  }                                              \
 266                  tp = intotcpcb(inp);                           \
 267                  TCPDEBUG1();                                   \
 268         } while(0)
 269
 270 #define COMMON_END1(req, noreply)                               \
 271         out: do {                                               \
 272                 TCPDEBUG2(req);                                 \
 273                 if (!(noreply))                                 \
 274                         lwkt_replymsg(&msg->lmsg, error);       \
 275                 return;                                         \
 276         } while(0)
 277
 278 #define COMMON_END(req)         COMMON_END1((req), 0)
 279
 280 /*
 281  * Give the socket an address.
 282  */
 283 static void
 284 tcp_usr_bind(netmsg_t msg)
 285 {
 286         struct socket *so = msg->bind.base.nm_so;
 287         struct sockaddr *nam = msg->bind.nm_nam;
 288         struct thread *td = msg->bind.nm_td;
 289         int error = 0;
 290         struct inpcb *inp;
 291         struct tcpcb *tp;
 292         struct sockaddr_in *sinp;
 293
 294         COMMON_START(so, inp, 0);
 295
 296         /*
 297          * Must check for multicast addresses and disallow binding
 298          * to them.
 299          */
 300         sinp = (struct sockaddr_in *)nam;
 301         if (sinp->sin_family == AF_INET &&
 302             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 303                 error = EAFNOSUPPORT;
 304                 goto out;
 305         }
 306         error = in_pcbbind(inp, nam, td);
 307         if (error)
 308                 goto out;
 309         COMMON_END(PRU_BIND);
 310
 311 }
 312
 313 #ifdef INET6
 314
 315 static void
 316 tcp6_usr_bind(netmsg_t msg)
 317 {
 318         struct socket *so = msg->bind.base.nm_so;
 319         struct sockaddr *nam = msg->bind.nm_nam;
 320         struct thread *td = msg->bind.nm_td;
 321         int error = 0;
 322         struct inpcb *inp;
 323         struct tcpcb *tp;
 324         struct sockaddr_in6 *sin6p;
 325
 326         COMMON_START(so, inp, 0);
 327
 328         /*
 329          * Must check for multicast addresses and disallow binding
 330          * to them.
 331          */
 332         sin6p = (struct sockaddr_in6 *)nam;
 333         if (sin6p->sin6_family == AF_INET6 &&
 334             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
 335                 error = EAFNOSUPPORT;
 336                 goto out;
 337         }
 338         inp->inp_vflag &= ~INP_IPV4;
 339         inp->inp_vflag |= INP_IPV6;
 340         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 341                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 342                         inp->inp_vflag |= INP_IPV4;
 343                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 344                         struct sockaddr_in sin;
 345
 346                         in6_sin6_2_sin(&sin, sin6p);
 347                         inp->inp_vflag |= INP_IPV4;
 348                         inp->inp_vflag &= ~INP_IPV6;
 349                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 350                         goto out;
 351                 }
 352         }
 353         error = in6_pcbbind(inp, nam, td);
 354         if (error)
 355                 goto out;
 356         COMMON_END(PRU_BIND);
 357 }
 358 #endif /* INET6 */
 359
 360 #ifdef SMP
 361
 362 struct netmsg_inswildcard {
 363         struct netmsg_base      base;
 364         struct inpcb            *nm_inp;
 365 };
 366
 367 static void
 368 in_pcbinswildcardhash_handler(netmsg_t msg)
 369 {
 370         struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
 371         int cpu = mycpuid, nextcpu;
 372
 373         in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
 374
 375         nextcpu = cpu + 1;
 376         if (nextcpu < ncpus2)
 377                 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg);
 378         else
 379                 lwkt_replymsg(&nm->base.lmsg, 0);
 380 }
 381
 382 #endif
 383
 384 /*
 385  * Prepare to accept connections.
 386  */
 387 static void
 388 tcp_usr_listen(netmsg_t msg)
 389 {
 390         struct socket *so = msg->listen.base.nm_so;
 391         struct thread *td = msg->listen.nm_td;
 392         int error = 0;
 393         struct inpcb *inp;
 394         struct tcpcb *tp;
 395 #ifdef SMP
 396         struct netmsg_inswildcard nm;
 397 #endif
 398
 399         COMMON_START(so, inp, 0);
 400
 401         if (tp->t_flags & TF_LISTEN)
 402                 goto out;
 403
 404         if (inp->inp_lport == 0) {
 405                 error = in_pcbbind(inp, NULL, td);
 406                 if (error)
 407                         goto out;
 408         }
 409
 410         tp->t_state = TCPS_LISTEN;
 411         tp->t_flags |= TF_LISTEN;
 412         tp->tt_msg = NULL; /* Catch any invalid timer usage */
 413
 414 #ifdef SMP
 415         if (ncpus > 1) {
 416                 /*
 417                  * We have to set the flag because we can't have other cpus
 418                  * messing with our inp's flags.
 419                  */
 420                 KASSERT(!(inp->inp_flags & INP_CONNECTED),
 421                         ("already on connhash"));
 422                 KASSERT(!(inp->inp_flags & INP_WILDCARD),
 423                         ("already on wildcardhash"));
 424                 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
 425                         ("already on MP wildcardhash"));
 426                 inp->inp_flags |= INP_WILDCARD_MP;
 427
 428                 KKASSERT(so->so_port == cpu_portfn(0));
 429                 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
 430                 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
 431
 432                 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
 433                             MSGF_PRIORITY, in_pcbinswildcardhash_handler);
 434                 nm.nm_inp = inp;
 435                 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
 436         }
 437 #endif
 438         in_pcbinswildcardhash(inp);
 439         COMMON_END(PRU_LISTEN);
 440 }
 441
 442 #ifdef INET6
 443
 444 static void
 445 tcp6_usr_listen(netmsg_t msg)
 446 {
 447         struct socket *so = msg->listen.base.nm_so;
 448         struct thread *td = msg->listen.nm_td;
 449         int error = 0;
 450         struct inpcb *inp;
 451         struct tcpcb *tp;
 452 #ifdef SMP
 453         struct netmsg_inswildcard nm;
 454 #endif
 455
 456         COMMON_START(so, inp, 0);
 457
 458         if (tp->t_flags & TF_LISTEN)
 459                 goto out;
 460
 461         if (inp->inp_lport == 0) {
 462                 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
 463                         inp->inp_vflag |= INP_IPV4;
 464                 else
 465                         inp->inp_vflag &= ~INP_IPV4;
 466                 error = in6_pcbbind(inp, NULL, td);
 467                 if (error)
 468                         goto out;
 469         }
 470
 471         tp->t_state = TCPS_LISTEN;
 472         tp->t_flags |= TF_LISTEN;
 473         tp->tt_msg = NULL; /* Catch any invalid timer usage */
 474
 475 #ifdef SMP
 476         if (ncpus > 1) {
 477                 /*
 478                  * We have to set the flag because we can't have other cpus
 479                  * messing with our inp's flags.
 480                  */
 481                 KASSERT(!(inp->inp_flags & INP_CONNECTED),
 482                         ("already on connhash"));
 483                 KASSERT(!(inp->inp_flags & INP_WILDCARD),
 484                         ("already on wildcardhash"));
 485                 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
 486                         ("already on MP wildcardhash"));
 487                 inp->inp_flags |= INP_WILDCARD_MP;
 488
 489                 KKASSERT(so->so_port == cpu_portfn(0));
 490                 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
 491                 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
 492
 493                 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
 494                             MSGF_PRIORITY, in_pcbinswildcardhash_handler);
 495                 nm.nm_inp = inp;
 496                 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
 497         }
 498 #endif
 499         in_pcbinswildcardhash(inp);
 500         COMMON_END(PRU_LISTEN);
 501 }
 502 #endif /* INET6 */
 503
 504 /*
 505  * Initiate connection to peer.
 506  * Create a template for use in transmissions on this connection.
 507  * Enter SYN_SENT state, and mark socket as connecting.
 508  * Start keep-alive timer, and seed output sequence space.
 509  * Send initial segment on connection.
 510  */
 511 static void
 512 tcp_usr_connect(netmsg_t msg)
 513 {
 514         struct socket *so = msg->connect.base.nm_so;
 515         struct sockaddr *nam = msg->connect.nm_nam;
 516         struct thread *td = msg->connect.nm_td;
 517         int error = 0;
 518         struct inpcb *inp;
 519         struct tcpcb *tp;
 520         struct sockaddr_in *sinp;
 521
 522         COMMON_START(so, inp, 0);
 523
 524         /*
 525          * Must disallow TCP ``connections'' to multicast addresses.
 526          */
 527         sinp = (struct sockaddr_in *)nam;
 528         if (sinp->sin_family == AF_INET
 529             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 530                 error = EAFNOSUPPORT;
 531                 goto out;
 532         }
 533
 534         if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
 535                 error = EAFNOSUPPORT; /* IPv6 only jail */
 536                 goto out;
 537         }
 538
 539         tcp_connect(msg);
 540         /* msg is invalid now */
 541         return;
 542 out:
 543         if (msg->connect.nm_m) {
 544                 m_freem(msg->connect.nm_m);
 545                 msg->connect.nm_m = NULL;
 546         }
 547         lwkt_replymsg(&msg->lmsg, error);
 548 }
 549
 550 #ifdef INET6
 551
 552 static void
 553 tcp6_usr_connect(netmsg_t msg)
 554 {
 555         struct socket *so = msg->connect.base.nm_so;
 556         struct sockaddr *nam = msg->connect.nm_nam;
 557         struct thread *td = msg->connect.nm_td;
 558         int error = 0;
 559         struct inpcb *inp;
 560         struct tcpcb *tp;
 561         struct sockaddr_in6 *sin6p;
 562
 563         COMMON_START(so, inp, 0);
 564
 565         /*
 566          * Must disallow TCP ``connections'' to multicast addresses.
 567          */
 568         sin6p = (struct sockaddr_in6 *)nam;
 569         if (sin6p->sin6_family == AF_INET6
 570             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
 571                 error = EAFNOSUPPORT;
 572                 goto out;
 573         }
 574
 575         if (!prison_remote_ip(td, nam)) {
 576                 error = EAFNOSUPPORT; /* IPv4 only jail */
 577                 goto out;
 578         }
 579
 580         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 581                 struct sockaddr_in *sinp;
 582
 583                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 584                         error = EINVAL;
 585                         goto out;
 586                 }
 587                 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
 588                 in6_sin6_2_sin(sinp, sin6p);
 589                 inp->inp_vflag |= INP_IPV4;
 590                 inp->inp_vflag &= ~INP_IPV6;
 591                 msg->connect.nm_nam = (struct sockaddr *)sinp;
 592                 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC;
 593                 tcp_connect(msg);
 594                 /* msg is invalid now */
 595                 return;
 596         }
 597         inp->inp_vflag &= ~INP_IPV4;
 598         inp->inp_vflag |= INP_IPV6;
 599         inp->inp_inc.inc_isipv6 = 1;
 600
 601         msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
 602         tcp6_connect(msg);
 603         /* msg is invalid now */
 604         return;
 605 out:
 606         if (msg->connect.nm_m) {
 607                 m_freem(msg->connect.nm_m);
 608                 msg->connect.nm_m = NULL;
 609         }
 610         lwkt_replymsg(&msg->lmsg, error);
 611 }
 612
 613 #endif /* INET6 */
 614
 615 /*
 616  * Initiate disconnect from peer.
 617  * If connection never passed embryonic stage, just drop;
 618  * else if don't need to let data drain, then can just drop anyways,
 619  * else have to begin TCP shutdown process: mark socket disconnecting,
 620  * drain unread data, state switch to reflect user close, and
 621  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 622  * when peer sends FIN and acks ours.
 623  *
 624  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 625  */
 626 static void
 627 tcp_usr_disconnect(netmsg_t msg)
 628 {
 629         struct socket *so = msg->disconnect.base.nm_so;
 630         int error = 0;
 631         struct inpcb *inp;
 632         struct tcpcb *tp;
 633
 634         COMMON_START(so, inp, 1);
 635         tp = tcp_disconnect(tp);
 636         COMMON_END(PRU_DISCONNECT);
 637 }
 638
 639 /*
 640  * Accept a connection.  Essentially all the work is
 641  * done at higher levels; just return the address
 642  * of the peer, storing through addr.
 643  */
 644 static void
 645 tcp_usr_accept(netmsg_t msg)
 646 {
 647         struct socket *so = msg->accept.base.nm_so;
 648         struct sockaddr **nam = msg->accept.nm_nam;
 649         int error = 0;
 650         struct inpcb *inp;
 651         struct tcpcb *tp = NULL;
 652         TCPDEBUG0;
 653
 654         inp = so->so_pcb;
 655         if (so->so_state & SS_ISDISCONNECTED) {
 656                 error = ECONNABORTED;
 657                 goto out;
 658         }
 659         if (inp == 0) {
 660                 error = EINVAL;
 661                 goto out;
 662         }
 663
 664         tp = intotcpcb(inp);
 665         TCPDEBUG1();
 666         in_setpeeraddr(so, nam);
 667         COMMON_END(PRU_ACCEPT);
 668 }
 669
 670 #ifdef INET6
 671 static void
 672 tcp6_usr_accept(netmsg_t msg)
 673 {
 674         struct socket *so = msg->accept.base.nm_so;
 675         struct sockaddr **nam = msg->accept.nm_nam;
 676         int error = 0;
 677         struct inpcb *inp;
 678         struct tcpcb *tp = NULL;
 679         TCPDEBUG0;
 680
 681         inp = so->so_pcb;
 682
 683         if (so->so_state & SS_ISDISCONNECTED) {
 684                 error = ECONNABORTED;
 685                 goto out;
 686         }
 687         if (inp == 0) {
 688                 error = EINVAL;
 689                 goto out;
 690         }
 691         tp = intotcpcb(inp);
 692         TCPDEBUG1();
 693         in6_mapped_peeraddr(so, nam);
 694         COMMON_END(PRU_ACCEPT);
 695 }
 696 #endif /* INET6 */
 697 /*
 698  * Mark the connection as being incapable of further output.
 699  */
 700 static void
 701 tcp_usr_shutdown(netmsg_t msg)
 702 {
 703         struct socket *so = msg->shutdown.base.nm_so;
 704         int error = 0;
 705         struct inpcb *inp;
 706         struct tcpcb *tp;
 707
 708         COMMON_START(so, inp, 0);
 709         socantsendmore(so);
 710         tp = tcp_usrclosed(tp);
 711         if (tp)
 712                 error = tcp_output(tp);
 713         COMMON_END(PRU_SHUTDOWN);
 714 }
 715
 716 /*
 717  * After a receive, possibly send window update to peer.
 718  */
 719 static void
 720 tcp_usr_rcvd(netmsg_t msg)
 721 {
 722         struct socket *so = msg->rcvd.base.nm_so;
 723         int error = 0, noreply = 0;
 724         struct inpcb *inp;
 725         struct tcpcb *tp;
 726
 727         COMMON_START(so, inp, 0);
 728
 729         if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) {
 730                 noreply = 1;
 731                 so_async_rcvd_reply(so);
 732         }
 733         tcp_output(tp);
 734
 735         COMMON_END1(PRU_RCVD, noreply);
 736 }
 737
 738 /*
 739  * Do a send by putting data in output queue and updating urgent
 740  * marker if URG set.  Possibly send more data.  Unlike the other
 741  * pru_*() routines, the mbuf chains are our responsibility.  We
 742  * must either enqueue them or free them.  The other pru_* routines
 743  * generally are caller-frees.
 744  */
 745 static void
 746 tcp_usr_send(netmsg_t msg)
 747 {
 748         struct socket *so = msg->send.base.nm_so;
 749         int flags = msg->send.nm_flags;
 750         struct mbuf *m = msg->send.nm_m;
 751         int error = 0;
 752         struct inpcb *inp;
 753         struct tcpcb *tp;
 754         TCPDEBUG0;
 755
 756         KKASSERT(msg->send.nm_control == NULL);
 757         KKASSERT(msg->send.nm_addr == NULL);
 758         KKASSERT((flags & PRUS_FREEADDR) == 0);
 759
 760         inp = so->so_pcb;
 761
 762         if (inp == NULL) {
 763                 /*
 764                  * OOPS! we lost a race, the TCP session got reset after
 765                  * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
 766                  * network interrupt in the non-critical section of sosend().
 767                  */
 768                 m_freem(m);
 769                 error = ECONNRESET;     /* XXX EPIPE? */
 770                 tp = NULL;
 771                 TCPDEBUG1();
 772                 goto out;
 773         }
 774         tp = intotcpcb(inp);
 775         TCPDEBUG1();
 776
 777 #ifdef foo
 778         /*
 779          * This is no longer necessary, since:
 780          * - sosendtcp() has already checked it for us
 781          * - It does not work with asynchronized send
 782          */
 783
 784         /*
 785          * Don't let too much OOB data build up
 786          */
 787         if (flags & PRUS_OOB) {
 788                 if (ssb_space(&so->so_snd) < -512) {
 789                         m_freem(m);
 790                         error = ENOBUFS;
 791                         goto out;
 792                 }
 793         }
 794 #endif
 795
 796         /*
 797          * Pump the data into the socket.
 798          */
 799         if (m)
 800                 ssb_appendstream(&so->so_snd, m);
 801         if (flags & PRUS_OOB) {
 802                 /*
 803                  * According to RFC961 (Assigned Protocols),
 804                  * the urgent pointer points to the last octet
 805                  * of urgent data.  We continue, however,
 806                  * to consider it to indicate the first octet
 807                  * of data past the urgent section.
 808                  * Otherwise, snd_up should be one lower.
 809                  */
 810                 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
 811                 tp->t_flags |= TF_FORCE;
 812                 error = tcp_output(tp);
 813                 tp->t_flags &= ~TF_FORCE;
 814         } else {
 815                 if (flags & PRUS_EOF) {
 816                         /*
 817                          * Close the send side of the connection after
 818                          * the data is sent.
 819                          */
 820                         socantsendmore(so);
 821                         tp = tcp_usrclosed(tp);
 822                 }
 823                 if (tp != NULL) {
 824                         if (flags & PRUS_MORETOCOME)
 825                                 tp->t_flags |= TF_MORETOCOME;
 826                         error = tcp_output(tp);
 827                         if (flags & PRUS_MORETOCOME)
 828                                 tp->t_flags &= ~TF_MORETOCOME;
 829                 }
 830         }
 831         COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
 832                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
 833                    (flags & PRUS_NOREPLY));
 834 }
 835
 836 /*
 837  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 838  *       will sofree() it when we return.
 839  */
 840 static void
 841 tcp_usr_abort(netmsg_t msg)
 842 {
 843         struct socket *so = msg->abort.base.nm_so;
 844         int error = 0;
 845         struct inpcb *inp;
 846         struct tcpcb *tp;
 847
 848         COMMON_START(so, inp, 1);
 849         tp = tcp_drop(tp, ECONNABORTED);
 850         COMMON_END(PRU_ABORT);
 851 }
 852
 853 /*
 854  * Receive out-of-band data.
 855  */
 856 static void
 857 tcp_usr_rcvoob(netmsg_t msg)
 858 {
 859         struct socket *so = msg->rcvoob.base.nm_so;
 860         struct mbuf *m = msg->rcvoob.nm_m;
 861         int flags = msg->rcvoob.nm_flags;
 862         int error = 0;
 863         struct inpcb *inp;
 864         struct tcpcb *tp;
 865
 866         COMMON_START(so, inp, 0);
 867         if ((so->so_oobmark == 0 &&
 868              (so->so_state & SS_RCVATMARK) == 0) ||
 869             so->so_options & SO_OOBINLINE ||
 870             tp->t_oobflags & TCPOOB_HADDATA) {
 871                 error = EINVAL;
 872                 goto out;
 873         }
 874         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
 875                 error = EWOULDBLOCK;
 876                 goto out;
 877         }
 878         m->m_len = 1;
 879         *mtod(m, caddr_t) = tp->t_iobc;
 880         if ((flags & MSG_PEEK) == 0)
 881                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
 882         COMMON_END(PRU_RCVOOB);
 883 }
 884
 885 static void
 886 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
 887 {
 888         in_savefaddr(so, faddr);
 889 }
 890
 891 #ifdef INET6
 892 static void
 893 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
 894 {
 895         in6_mapped_savefaddr(so, faddr);
 896 }
 897 #endif
 898
 899 /* xxx - should be const */
 900 struct pr_usrreqs tcp_usrreqs = {
 901         .pru_abort = tcp_usr_abort,
 902         .pru_accept = tcp_usr_accept,
 903         .pru_attach = tcp_usr_attach,
 904         .pru_bind = tcp_usr_bind,
 905         .pru_connect = tcp_usr_connect,
 906         .pru_connect2 = pr_generic_notsupp,
 907         .pru_control = in_control_dispatch,
 908         .pru_detach = tcp_usr_detach,
 909         .pru_disconnect = tcp_usr_disconnect,
 910         .pru_listen = tcp_usr_listen,
 911         .pru_peeraddr = in_setpeeraddr_dispatch,
 912         .pru_rcvd = tcp_usr_rcvd,
 913         .pru_rcvoob = tcp_usr_rcvoob,
 914         .pru_send = tcp_usr_send,
 915         .pru_sense = pru_sense_null,
 916         .pru_shutdown = tcp_usr_shutdown,
 917         .pru_sockaddr = in_setsockaddr_dispatch,
 918         .pru_sosend = sosendtcp,
 919         .pru_soreceive = sorecvtcp,
 920         .pru_savefaddr = tcp_usr_savefaddr
 921 };
 922
 923 #ifdef INET6
 924 struct pr_usrreqs tcp6_usrreqs = {
 925         .pru_abort = tcp_usr_abort,
 926         .pru_accept = tcp6_usr_accept,
 927         .pru_attach = tcp_usr_attach,
 928         .pru_bind = tcp6_usr_bind,
 929         .pru_connect = tcp6_usr_connect,
 930         .pru_connect2 = pr_generic_notsupp,
 931         .pru_control = in6_control_dispatch,
 932         .pru_detach = tcp_usr_detach,
 933         .pru_disconnect = tcp_usr_disconnect,
 934         .pru_listen = tcp6_usr_listen,
 935         .pru_peeraddr = in6_mapped_peeraddr_dispatch,
 936         .pru_rcvd = tcp_usr_rcvd,
 937         .pru_rcvoob = tcp_usr_rcvoob,
 938         .pru_send = tcp_usr_send,
 939         .pru_sense = pru_sense_null,
 940         .pru_shutdown = tcp_usr_shutdown,
 941         .pru_sockaddr = in6_mapped_sockaddr_dispatch,
 942         .pru_sosend = sosendtcp,
 943         .pru_soreceive = sorecvtcp,
 944         .pru_savefaddr = tcp6_usr_savefaddr
 945 };
 946 #endif /* INET6 */
 947
 948 static int
 949 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
 950                   struct sockaddr_in *sin, struct sockaddr_in *if_sin)
 951 {
 952         struct inpcb *inp = tp->t_inpcb, *oinp;
 953         struct socket *so = inp->inp_socket;
 954         struct route *ro = &inp->inp_route;
 955
 956         oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
 957                                  sin->sin_addr, sin->sin_port,
 958                                  (inp->inp_laddr.s_addr != INADDR_ANY ?
 959                                   inp->inp_laddr : if_sin->sin_addr),
 960                                 inp->inp_lport, 0, NULL);
 961         if (oinp != NULL) {
 962                 m_freem(m);
 963                 return (EADDRINUSE);
 964         }
 965         if (inp->inp_laddr.s_addr == INADDR_ANY)
 966                 inp->inp_laddr = if_sin->sin_addr;
 967         inp->inp_faddr = sin->sin_addr;
 968         inp->inp_fport = sin->sin_port;
 969         inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
 970         in_pcbinsconnhash(inp);
 971
 972         /*
 973          * We are now on the inpcb's owner CPU, if the cached route was
 974          * freed because the rtentry's owner CPU is not the current CPU
 975          * (e.g. in tcp_connect()), then we try to reallocate it here with
 976          * the hope that a rtentry may be cloned from a RTF_PRCLONING
 977          * rtentry.
 978          */
 979         if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 980             ro->ro_rt == NULL) {
 981                 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 982                 ro->ro_dst.sa_family = AF_INET;
 983                 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 984                 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
 985                         sin->sin_addr;
 986                 rtalloc(ro);
 987         }
 988
 989         /*
 990          * Now that no more errors can occur, change the protocol processing
 991          * port to the current thread (which is the correct thread).
 992          *
 993          * Create TCP timer message now; we are on the tcpcb's owner
 994          * CPU/thread.
 995          */
 996         tcp_create_timermsg(tp, &curthread->td_msgport);
 997
 998         /*
 999          * Compute window scaling to request.  Use a larger scaling then
1000          * needed for the initial receive buffer in case the receive buffer
1001          * gets expanded.
1002          */
1003         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1004                 tp->request_r_scale = TCP_MIN_WINSHIFT;
1005         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1006                (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
1007         ) {
1008                 tp->request_r_scale++;
1009         }
1010
1011         soisconnecting(so);
1012         tcpstat.tcps_connattempt++;
1013         tp->t_state = TCPS_SYN_SENT;
1014         tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1015         tp->iss = tcp_new_isn(tp);
1016         tcp_sendseqinit(tp);
1017         if (m) {
1018                 ssb_appendstream(&so->so_snd, m);
1019                 m = NULL;
1020                 if (flags & PRUS_OOB)
1021                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1022         }
1023
1024         /*
1025          * Close the send side of the connection after
1026          * the data is sent if flagged.
1027          */
1028         if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1029                 socantsendmore(so);
1030                 tp = tcp_usrclosed(tp);
1031         }
1032         return (tcp_output(tp));
1033 }
1034
1035 /*
1036  * Common subroutine to open a TCP connection to remote host specified
1037  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1038  * port number if needed.  Call in_pcbladdr to do the routing and to choose
1039  * a local host address (interface).
1040  * Initialize connection parameters and enter SYN-SENT state.
1041  */
1042 static void
1043 tcp_connect(netmsg_t msg)
1044 {
1045         struct socket *so = msg->connect.base.nm_so;
1046         struct sockaddr *nam = msg->connect.nm_nam;
1047         struct thread *td = msg->connect.nm_td;
1048         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1049         struct sockaddr_in *if_sin;
1050         struct inpcb *inp;
1051         struct tcpcb *tp;
1052         int error, calc_laddr = 1;
1053 #ifdef SMP
1054         lwkt_port_t port;
1055 #endif
1056
1057         COMMON_START(so, inp, 0);
1058
1059         /*
1060          * Reconnect our pcb if we have to
1061          */
1062         if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1063                 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1064                 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1065         }
1066
1067         /*
1068          * Bind if we have to
1069          */
1070         if (inp->inp_lport == 0) {
1071                 if (tcp_lport_extension) {
1072                         KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1073
1074                         error = in_pcbladdr(inp, nam, &if_sin, td);
1075                         if (error)
1076                                 goto out;
1077                         inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1078
1079                         error = in_pcbconn_bind(inp, nam, td);
1080                         if (error)
1081                                 goto out;
1082
1083                         calc_laddr = 0;
1084                 } else {
1085                         error = in_pcbbind(inp, NULL, td);
1086                         if (error)
1087                                 goto out;
1088                 }
1089         }
1090
1091         if (calc_laddr) {
1092                 /*
1093                  * Calculate the correct protocol processing thread.  The
1094                  * connect operation must run there.  Set the forwarding
1095                  * port before we forward the message or it will get bounced
1096                  * right back to us.
1097                  */
1098                 error = in_pcbladdr(inp, nam, &if_sin, td);
1099                 if (error)
1100                         goto out;
1101         }
1102         KKASSERT(inp->inp_socket == so);
1103
1104 #ifdef SMP
1105         port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1106                             (inp->inp_laddr.s_addr ?
1107                              inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1108                             inp->inp_lport);
1109
1110         if (port != &curthread->td_msgport) {
1111                 struct route *ro = &inp->inp_route;
1112
1113                 /*
1114                  * in_pcbladdr() may have allocated a route entry for us
1115                  * on the current CPU, but we need a route entry on the
1116                  * inpcb's owner CPU, so free it here.
1117                  */
1118                 if (ro->ro_rt != NULL)
1119                         RTFREE(ro->ro_rt);
1120                 bzero(ro, sizeof(*ro));
1121
1122                 /*
1123                  * We are moving the protocol processing port the socket
1124                  * is on, we have to unlink here and re-link on the
1125                  * target cpu.
1126                  */
1127                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1128                 sosetport(so, port);
1129                 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1130                 msg->connect.base.nm_dispatch = tcp_connect;
1131
1132                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1133                 /* msg invalid now */
1134                 return;
1135         }
1136 #else
1137         KKASSERT(so->so_port == &curthread->td_msgport);
1138 #endif
1139         error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1140                                   msg->connect.nm_m, sin, if_sin);
1141         msg->connect.nm_m = NULL;
1142 out:
1143         if (msg->connect.nm_m) {
1144                 m_freem(msg->connect.nm_m);
1145                 msg->connect.nm_m = NULL;
1146         }
1147         if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1148                 kfree(msg->connect.nm_nam, M_LWKTMSG);
1149                 msg->connect.nm_nam = NULL;
1150         }
1151         lwkt_replymsg(&msg->connect.base.lmsg, error);
1152         /* msg invalid now */
1153 }
1154
1155 #ifdef INET6
1156
1157 static void
1158 tcp6_connect(netmsg_t msg)
1159 {
1160         struct tcpcb *tp;
1161         struct socket *so = msg->connect.base.nm_so;
1162         struct sockaddr *nam = msg->connect.nm_nam;
1163         struct thread *td = msg->connect.nm_td;
1164         struct inpcb *inp;
1165         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1166         struct in6_addr *addr6;
1167 #ifdef SMP
1168         lwkt_port_t port;
1169 #endif
1170         int error;
1171
1172         COMMON_START(so, inp, 0);
1173
1174         /*
1175          * Reconnect our pcb if we have to
1176          */
1177         if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1178                 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1179                 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1180         }
1181
1182         /*
1183          * Bind if we have to
1184          */
1185         if (inp->inp_lport == 0) {
1186                 error = in6_pcbbind(inp, NULL, td);
1187                 if (error)
1188                         goto out;
1189         }
1190
1191         /*
1192          * Cannot simply call in_pcbconnect, because there might be an
1193          * earlier incarnation of this same connection still in
1194          * TIME_WAIT state, creating an ADDRINUSE error.
1195          */
1196         error = in6_pcbladdr(inp, nam, &addr6, td);
1197         if (error)
1198                 goto out;
1199
1200 #ifdef SMP
1201         port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1202
1203         if (port != &curthread->td_msgport) {
1204                 struct route *ro = &inp->inp_route;
1205
1206                 /*
1207                  * in_pcbladdr() may have allocated a route entry for us
1208                  * on the current CPU, but we need a route entry on the
1209                  * inpcb's owner CPU, so free it here.
1210                  */
1211                 if (ro->ro_rt != NULL)
1212                         RTFREE(ro->ro_rt);
1213                 bzero(ro, sizeof(*ro));
1214
1215                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1216                 sosetport(so, port);
1217                 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1218                 msg->connect.base.nm_dispatch = tcp6_connect;
1219
1220                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1221                 /* msg invalid now */
1222                 return;
1223         }
1224 #endif
1225         error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1226                                    &msg->connect.nm_m, sin6, addr6);
1227         /* nm_m may still be intact */
1228 out:
1229         if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
1230                 tcp_connect(msg);
1231                 /* msg invalid now */
1232         } else {
1233                 if (msg->connect.nm_m) {
1234                         m_freem(msg->connect.nm_m);
1235                         msg->connect.nm_m = NULL;
1236                 }
1237                 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1238                         kfree(msg->connect.nm_nam, M_LWKTMSG);
1239                         msg->connect.nm_nam = NULL;
1240                 }
1241                 lwkt_replymsg(&msg->connect.base.lmsg, error);
1242                 /* msg invalid now */
1243         }
1244 }
1245
1246 static int
1247 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1248                    struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1249 {
1250         struct mbuf *m = *mp;
1251         struct inpcb *inp = tp->t_inpcb;
1252         struct socket *so = inp->inp_socket;
1253         struct inpcb *oinp;
1254
1255         /*
1256          * Cannot simply call in_pcbconnect, because there might be an
1257          * earlier incarnation of this same connection still in
1258          * TIME_WAIT state, creating an ADDRINUSE error.
1259          */
1260         oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
1261                                   &sin6->sin6_addr, sin6->sin6_port,
1262                                   (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1263                                       addr6 : &inp->in6p_laddr),
1264                                   inp->inp_lport,  0, NULL);
1265         if (oinp)
1266                 return (EADDRINUSE);
1267
1268         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1269                 inp->in6p_laddr = *addr6;
1270         inp->in6p_faddr = sin6->sin6_addr;
1271         inp->inp_fport = sin6->sin6_port;
1272         if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1273                 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1274         in_pcbinsconnhash(inp);
1275
1276         /*
1277          * Now that no more errors can occur, change the protocol processing
1278          * port to the current thread (which is the correct thread).
1279          *
1280          * Create TCP timer message now; we are on the tcpcb's owner
1281          * CPU/thread.
1282          */
1283         tcp_create_timermsg(tp, &curthread->td_msgport);
1284
1285         /* Compute window scaling to request.  */
1286         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1287                 tp->request_r_scale = TCP_MIN_WINSHIFT;
1288         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1289             (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1290                 tp->request_r_scale++;
1291         }
1292
1293         soisconnecting(so);
1294         tcpstat.tcps_connattempt++;
1295         tp->t_state = TCPS_SYN_SENT;
1296         tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1297         tp->iss = tcp_new_isn(tp);
1298         tcp_sendseqinit(tp);
1299         if (m) {
1300                 ssb_appendstream(&so->so_snd, m);
1301                 *mp = NULL;
1302                 if (flags & PRUS_OOB)
1303                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1304         }
1305
1306         /*
1307          * Close the send side of the connection after
1308          * the data is sent if flagged.
1309          */
1310         if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1311                 socantsendmore(so);
1312                 tp = tcp_usrclosed(tp);
1313         }
1314         return (tcp_output(tp));
1315 }
1316
1317 #endif /* INET6 */
1318
1319 /*
1320  * The new sockopt interface makes it possible for us to block in the
1321  * copyin/out step (if we take a page fault).  Taking a page fault while
1322  * in a critical section is probably a Bad Thing.  (Since sockets and pcbs
1323  * both now use TSM, there probably isn't any need for this function to
1324  * run in a critical section any more.  This needs more examination.)
1325  */
1326 void
1327 tcp_ctloutput(netmsg_t msg)
1328 {
1329         struct socket *so = msg->base.nm_so;
1330         struct sockopt *sopt = msg->ctloutput.nm_sopt;
1331         int     error, opt, optval, opthz;
1332         struct  inpcb *inp;
1333         struct  tcpcb *tp;
1334
1335         error = 0;
1336         inp = so->so_pcb;
1337         if (inp == NULL) {
1338                 error = ECONNRESET;
1339                 goto done;
1340         }
1341
1342         if (sopt->sopt_level != IPPROTO_TCP) {
1343 #ifdef INET6
1344                 if (INP_CHECK_SOCKAF(so, AF_INET6))
1345                         ip6_ctloutput_dispatch(msg);
1346                 else
1347 #endif /* INET6 */
1348                 ip_ctloutput(msg);
1349                 /* msg invalid now */
1350                 return;
1351         }
1352         tp = intotcpcb(inp);
1353
1354         switch (sopt->sopt_dir) {
1355         case SOPT_SET:
1356                 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1357                                       sizeof optval);
1358                 if (error)
1359                         break;
1360                 switch (sopt->sopt_name) {
1361                 case TCP_FASTKEEP:
1362                         if (optval > 0)
1363                                 tp->t_keepidle = tp->t_keepintvl;
1364                         else
1365                                 tp->t_keepidle = tcp_keepidle;
1366                         tcp_timer_keep_activity(tp, 0);
1367                         break;
1368 #ifdef TCP_SIGNATURE
1369                 case TCP_SIGNATURE_ENABLE:
1370                         if (tp->t_state == TCPS_CLOSED) {
1371                                 /*
1372                                  * This is the only safe state that this
1373                                  * option could be changed.  Some segments
1374                                  * could already have been sent in other
1375                                  * states.
1376                                  */
1377                                 if (optval > 0)
1378                                         tp->t_flags |= TF_SIGNATURE;
1379                                 else
1380                                         tp->t_flags &= ~TF_SIGNATURE;
1381                         } else {
1382                                 error = EOPNOTSUPP;
1383                         }
1384                         break;
1385 #endif /* TCP_SIGNATURE */
1386                 case TCP_NODELAY:
1387                 case TCP_NOOPT:
1388                         switch (sopt->sopt_name) {
1389                         case TCP_NODELAY:
1390                                 opt = TF_NODELAY;
1391                                 break;
1392                         case TCP_NOOPT:
1393                                 opt = TF_NOOPT;
1394                                 break;
1395                         default:
1396                                 opt = 0; /* dead code to fool gcc */
1397                                 break;
1398                         }
1399
1400                         if (optval)
1401                                 tp->t_flags |= opt;
1402                         else
1403                                 tp->t_flags &= ~opt;
1404                         break;
1405
1406                 case TCP_NOPUSH:
1407                         if (tcp_disable_nopush)
1408                                 break;
1409                         if (optval)
1410                                 tp->t_flags |= TF_NOPUSH;
1411                         else {
1412                                 tp->t_flags &= ~TF_NOPUSH;
1413                                 error = tcp_output(tp);
1414                         }
1415                         break;
1416
1417                 case TCP_MAXSEG:
1418                         /*
1419                          * Must be between 0 and maxseg.  If the requested
1420                          * maxseg is too small to satisfy the desired minmss,
1421                          * pump it up (silently so sysctl modifications of
1422                          * minmss do not create unexpected program failures).
1423                          * Handle degenerate cases.
1424                          */
1425                         if (optval > 0 && optval <= tp->t_maxseg) {
1426                                 if (optval + 40 < tcp_minmss) {
1427                                         optval = tcp_minmss - 40;
1428                                         if (optval < 0)
1429                                                 optval = 1;
1430                                 }
1431                                 tp->t_maxseg = optval;
1432                         } else {
1433                                 error = EINVAL;
1434                         }
1435                         break;
1436
1437                 case TCP_KEEPINIT:
1438                         opthz = ((int64_t)optval * hz) / 1000;
1439                         if (opthz >= 1)
1440                                 tp->t_keepinit = opthz;
1441                         else
1442                                 error = EINVAL;
1443                         break;
1444
1445                 case TCP_KEEPIDLE:
1446                         opthz = ((int64_t)optval * hz) / 1000;
1447                         if (opthz >= 1) {
1448                                 tp->t_keepidle = opthz;
1449                                 tcp_timer_keep_activity(tp, 0);
1450                         } else {
1451                                 error = EINVAL;
1452                         }
1453                         break;
1454
1455                 case TCP_KEEPINTVL:
1456                         opthz = ((int64_t)optval * hz) / 1000;
1457                         if (opthz >= 1) {
1458                                 tp->t_keepintvl = opthz;
1459                                 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1460                         } else {
1461                                 error = EINVAL;
1462                         }
1463                         break;
1464
1465                 case TCP_KEEPCNT:
1466                         if (optval > 0) {
1467                                 tp->t_keepcnt = optval;
1468                                 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1469                         } else {
1470                                 error = EINVAL;
1471                         }
1472                         break;
1473
1474                 default:
1475                         error = ENOPROTOOPT;
1476                         break;
1477                 }
1478                 break;
1479
1480         case SOPT_GET:
1481                 switch (sopt->sopt_name) {
1482 #ifdef TCP_SIGNATURE
1483                 case TCP_SIGNATURE_ENABLE:
1484                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1485                         break;
1486 #endif /* TCP_SIGNATURE */
1487                 case TCP_NODELAY:
1488                         optval = tp->t_flags & TF_NODELAY;
1489                         break;
1490                 case TCP_MAXSEG:
1491                         optval = tp->t_maxseg;
1492                         break;
1493                 case TCP_NOOPT:
1494                         optval = tp->t_flags & TF_NOOPT;
1495                         break;
1496                 case TCP_NOPUSH:
1497                         optval = tp->t_flags & TF_NOPUSH;
1498                         break;
1499                 case TCP_KEEPINIT:
1500                         optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1501                         break;
1502                 case TCP_KEEPIDLE:
1503                         optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1504                         break;
1505                 case TCP_KEEPINTVL:
1506                         optval = ((int64_t)tp->t_keepintvl * 1000) / hz;
1507                         break;
1508                 case TCP_KEEPCNT:
1509                         optval = tp->t_keepcnt;
1510                         break;
1511                 default:
1512                         error = ENOPROTOOPT;
1513                         break;
1514                 }
1515                 if (error == 0)
1516                         soopt_from_kbuf(sopt, &optval, sizeof optval);
1517                 break;
1518         }
1519 done:
1520         lwkt_replymsg(&msg->lmsg, error);
1521 }
1522
1523 /*
1524  * tcp_sendspace and tcp_recvspace are the default send and receive window
1525  * sizes, respectively.  These are obsolescent (this information should
1526  * be set by the route).
1527  *
1528  * Use a default that does not require tcp window scaling to be turned
1529  * on.  Individual programs or the administrator can increase the default.
1530  */
1531 u_long  tcp_sendspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1532 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1533     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1534 u_long  tcp_recvspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1535 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1536     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1537
1538 /*
1539  * Attach TCP protocol to socket, allocating internet protocol control
1540  * block, tcp control block, bufer space, and entering LISTEN state
1541  * if to accept connections.
1542  */
1543 static int
1544 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1545 {
1546         struct tcpcb *tp;
1547         struct inpcb *inp;
1548         int error;
1549         int cpu;
1550 #ifdef INET6
1551         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1552 #endif
1553
1554         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
1555                 lwkt_gettoken(&so->so_rcv.ssb_token);
1556                 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1557                                   ai->sb_rlimit);
1558                 lwkt_reltoken(&so->so_rcv.ssb_token);
1559                 if (error)
1560                         return (error);
1561         }
1562         atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1563         atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
1564         cpu = mycpu->gd_cpuid;
1565
1566         /*
1567          * Set the default port for protocol processing. This will likely
1568          * change when we connect.
1569          */
1570         error = in_pcballoc(so, &tcbinfo[cpu]);
1571         if (error)
1572                 return (error);
1573         inp = so->so_pcb;
1574 #ifdef INET6
1575         if (isipv6) {
1576                 inp->inp_vflag |= INP_IPV6;
1577                 inp->in6p_hops = -1;    /* use kernel default */
1578         }
1579         else
1580 #endif
1581         inp->inp_vflag |= INP_IPV4;
1582         tp = tcp_newtcpcb(inp);
1583         if (tp == NULL) {
1584                 /*
1585                  * Make sure the socket is destroyed by the pcbdetach.
1586                  */
1587                 soreference(so);
1588 #ifdef INET6
1589                 if (isipv6)
1590                         in6_pcbdetach(inp);
1591                 else
1592 #endif
1593                 in_pcbdetach(inp);
1594                 sofree(so);     /* from ref above */
1595                 return (ENOBUFS);
1596         }
1597         tp->t_state = TCPS_CLOSED;
1598         return (0);
1599 }
1600
1601 /*
1602  * Initiate (or continue) disconnect.
1603  * If embryonic state, just send reset (once).
1604  * If in ``let data drain'' option and linger null, just drop.
1605  * Otherwise (hard), mark socket disconnecting and drop
1606  * current input data; switch states based on user close, and
1607  * send segment to peer (with FIN).
1608  */
1609 static struct tcpcb *
1610 tcp_disconnect(struct tcpcb *tp)
1611 {
1612         struct socket *so = tp->t_inpcb->inp_socket;
1613
1614         if (tp->t_state < TCPS_ESTABLISHED) {
1615                 tp = tcp_close(tp);
1616         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1617                 tp = tcp_drop(tp, 0);
1618         } else {
1619                 lwkt_gettoken(&so->so_rcv.ssb_token);
1620                 soisdisconnecting(so);
1621                 sbflush(&so->so_rcv.sb);
1622                 tp = tcp_usrclosed(tp);
1623                 if (tp)
1624                         tcp_output(tp);
1625                 lwkt_reltoken(&so->so_rcv.ssb_token);
1626         }
1627         return (tp);
1628 }
1629
1630 /*
1631  * User issued close, and wish to trail through shutdown states:
1632  * if never received SYN, just forget it.  If got a SYN from peer,
1633  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1634  * If already got a FIN from peer, then almost done; go to LAST_ACK
1635  * state.  In all other cases, have already sent FIN to peer (e.g.
1636  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1637  * for peer to send FIN or not respond to keep-alives, etc.
1638  * We can let the user exit from the close as soon as the FIN is acked.
1639  */
1640 static struct tcpcb *
1641 tcp_usrclosed(struct tcpcb *tp)
1642 {
1643
1644         switch (tp->t_state) {
1645
1646         case TCPS_CLOSED:
1647         case TCPS_LISTEN:
1648                 tp->t_state = TCPS_CLOSED;
1649                 tp = tcp_close(tp);
1650                 break;
1651
1652         case TCPS_SYN_SENT:
1653         case TCPS_SYN_RECEIVED:
1654                 tp->t_flags |= TF_NEEDFIN;
1655                 break;
1656
1657         case TCPS_ESTABLISHED:
1658                 tp->t_state = TCPS_FIN_WAIT_1;
1659                 break;
1660
1661         case TCPS_CLOSE_WAIT:
1662                 tp->t_state = TCPS_LAST_ACK;
1663                 break;
1664         }
1665         if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1666                 soisdisconnected(tp->t_inpcb->inp_socket);
1667                 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1668                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1669                         tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,
1670                             tcp_timer_2msl);
1671                 }
1672         }
1673         return (tp);
1674 }