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. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      From: @(#)tcp_usrreq.c  8.2 (Berkeley) 1/3/94
  63  * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
  64  */
  65
  66 #include "opt_ipsec.h"
  67 #include "opt_inet.h"
  68 #include "opt_inet6.h"
  69 #include "opt_tcpdebug.h"
  70
  71 #include <sys/param.h>
  72 #include <sys/systm.h>
  73 #include <sys/kernel.h>
  74 #include <sys/malloc.h>
  75 #include <sys/sysctl.h>
  76 #include <sys/globaldata.h>
  77 #include <sys/thread.h>
  78
  79 #include <sys/mbuf.h>
  80 #ifdef INET6
  81 #include <sys/domain.h>
  82 #endif /* INET6 */
  83 #include <sys/socket.h>
  84 #include <sys/socketvar.h>
  85 #include <sys/socketops.h>
  86 #include <sys/protosw.h>
  87
  88 #include <sys/thread2.h>
  89 #include <sys/msgport2.h>
  90 #include <sys/socketvar2.h>
  91
  92 #include <net/if.h>
  93 #include <net/netisr.h>
  94 #include <net/route.h>
  95
  96 #include <net/netmsg2.h>
  97 #include <net/netisr2.h>
  98
  99 #include <netinet/in.h>
 100 #include <netinet/in_systm.h>
 101 #ifdef INET6
 102 #include <netinet/ip6.h>
 103 #endif
 104 #include <netinet/in_pcb.h>
 105 #ifdef INET6
 106 #include <netinet6/in6_pcb.h>
 107 #endif
 108 #include <netinet/in_var.h>
 109 #include <netinet/ip_var.h>
 110 #ifdef INET6
 111 #include <netinet6/ip6_var.h>
 112 #include <netinet6/tcp6_var.h>
 113 #endif
 114 #include <netinet/tcp.h>
 115 #include <netinet/tcp_fsm.h>
 116 #include <netinet/tcp_seq.h>
 117 #include <netinet/tcp_timer.h>
 118 #include <netinet/tcp_timer2.h>
 119 #include <netinet/tcp_var.h>
 120 #include <netinet/tcpip.h>
 121 #ifdef TCPDEBUG
 122 #include <netinet/tcp_debug.h>
 123 #endif
 124
 125 #ifdef IPSEC
 126 #include <netinet6/ipsec.h>
 127 #endif /*IPSEC*/
 128
 129 /*
 130  * TCP protocol interface to socket abstraction.
 131  */
 132 extern  char *tcpstates[];      /* XXX ??? */
 133
 134 static int      tcp_attach (struct socket *, struct pru_attach_info *);
 135 static void     tcp_connect (netmsg_t msg);
 136 #ifdef INET6
 137 static void     tcp6_connect (netmsg_t msg);
 138 static int      tcp6_connect_oncpu(struct tcpcb *tp, int flags,
 139                                 struct mbuf **mp,
 140                                 struct sockaddr_in6 *sin6,
 141                                 struct in6_addr *addr6);
 142 #endif /* INET6 */
 143 static struct tcpcb *
 144                 tcp_disconnect (struct tcpcb *);
 145 static struct tcpcb *
 146                 tcp_usrclosed (struct tcpcb *);
 147
 148 #ifdef TCPDEBUG
 149 #define TCPDEBUG0       int ostate = 0
 150 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 151 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 152                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 153 #else
 154 #define TCPDEBUG0
 155 #define TCPDEBUG1()
 156 #define TCPDEBUG2(req)
 157 #endif
 158
 159 static int      tcp_lport_extension = 1;
 160 SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
 161     &tcp_lport_extension, 0, "");
 162
 163 /*
 164  * For some ill optimized programs, which try to use TCP_NOPUSH
 165  * to improve performance, will have small amount of data sits
 166  * in the sending buffer.  These small amount of data will _not_
 167  * be pushed into the network until more data are written into
 168  * the socket or the socket write side is shutdown.
 169  */
 170 static int      tcp_disable_nopush = 1;
 171 SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW,
 172     &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect");
 173
 174 /*
 175  * TCP attaches to socket via pru_attach(), reserving space,
 176  * and an internet control block.  This is likely occuring on
 177  * cpu0 and may have to move later when we bind/connect.
 178  */
 179 static void
 180 tcp_usr_attach(netmsg_t msg)
 181 {
 182         struct socket *so = msg->base.nm_so;
 183         struct pru_attach_info *ai = msg->attach.nm_ai;
 184         int error;
 185         struct inpcb *inp;
 186         struct tcpcb *tp = NULL;
 187         TCPDEBUG0;
 188
 189         soreference(so);
 190         inp = so->so_pcb;
 191         TCPDEBUG1();
 192         if (inp) {
 193                 error = EISCONN;
 194                 goto out;
 195         }
 196
 197         error = tcp_attach(so, ai);
 198         if (error)
 199                 goto out;
 200
 201         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 202                 so->so_linger = TCP_LINGERTIME;
 203         tp = sototcpcb(so);
 204 out:
 205         sofree(so);             /* from ref above */
 206         TCPDEBUG2(PRU_ATTACH);
 207         lwkt_replymsg(&msg->lmsg, error);
 208 }
 209
 210 /*
 211  * pru_detach() detaches the TCP protocol from the socket.
 212  * If the protocol state is non-embryonic, then can't
 213  * do this directly: have to initiate a pru_disconnect(),
 214  * which may finish later; embryonic TCB's can just
 215  * be discarded here.
 216  */
 217 static void
 218 tcp_usr_detach(netmsg_t msg)
 219 {
 220         struct socket *so = msg->base.nm_so;
 221         int error = 0;
 222         struct inpcb *inp;
 223         struct tcpcb *tp;
 224         TCPDEBUG0;
 225
 226         inp = so->so_pcb;
 227
 228         /*
 229          * If the inp is already detached it may have been due to an async
 230          * close.  Just return as if no error occured.
 231          *
 232          * It's possible for the tcpcb (tp) to disconnect from the inp due
 233          * to tcp_drop()->tcp_close() being called.  This may occur *after*
 234          * the detach message has been queued so we may find a NULL tp here.
 235          */
 236         if (inp) {
 237                 if ((tp = intotcpcb(inp)) != NULL) {
 238                         TCPDEBUG1();
 239                         tp = tcp_disconnect(tp);
 240                         TCPDEBUG2(PRU_DETACH);
 241                 }
 242         }
 243         lwkt_replymsg(&msg->lmsg, error);
 244 }
 245
 246 /*
 247  * NOTE: ignore_error is non-zero for certain disconnection races
 248  * which we want to silently allow, otherwise close() may return
 249  * an unexpected error.
 250  *
 251  * NOTE: The variables (msg) and (tp) are assumed.
 252  */
 253 #define COMMON_START(so, inp, ignore_error)                     \
 254         TCPDEBUG0;                                              \
 255                                                                 \
 256         inp = so->so_pcb;                                       \
 257         do {                                                    \
 258                 if (inp == NULL) {                              \
 259                         error = ignore_error ? 0 : EINVAL;      \
 260                         tp = NULL;                              \
 261                         goto out;                               \
 262                 }                                               \
 263                 tp = intotcpcb(inp);                            \
 264                 TCPDEBUG1();                                    \
 265         } while(0)
 266
 267 #define COMMON_END1(req, noreply)                               \
 268         out: do {                                               \
 269                 TCPDEBUG2(req);                                 \
 270                 if (!(noreply))                                 \
 271                         lwkt_replymsg(&msg->lmsg, error);       \
 272                 return;                                         \
 273         } while(0)
 274
 275 #define COMMON_END(req)         COMMON_END1((req), 0)
 276
 277 /*
 278  * Give the socket an address.
 279  */
 280 static void
 281 tcp_usr_bind(netmsg_t msg)
 282 {
 283         struct socket *so = msg->bind.base.nm_so;
 284         struct sockaddr *nam = msg->bind.nm_nam;
 285         struct thread *td = msg->bind.nm_td;
 286         int error = 0;
 287         struct inpcb *inp;
 288         struct tcpcb *tp;
 289         struct sockaddr_in *sinp;
 290
 291         COMMON_START(so, inp, 0);
 292
 293         /*
 294          * Must check for multicast addresses and disallow binding
 295          * to them.
 296          */
 297         sinp = (struct sockaddr_in *)nam;
 298         if (sinp->sin_family == AF_INET &&
 299             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 300                 error = EAFNOSUPPORT;
 301                 goto out;
 302         }
 303         error = in_pcbbind(inp, nam, td);
 304         if (error)
 305                 goto out;
 306         COMMON_END(PRU_BIND);
 307
 308 }
 309
 310 #ifdef INET6
 311
 312 static void
 313 tcp6_usr_bind(netmsg_t msg)
 314 {
 315         struct socket *so = msg->bind.base.nm_so;
 316         struct sockaddr *nam = msg->bind.nm_nam;
 317         struct thread *td = msg->bind.nm_td;
 318         int error = 0;
 319         struct inpcb *inp;
 320         struct tcpcb *tp;
 321         struct sockaddr_in6 *sin6p;
 322
 323         COMMON_START(so, inp, 0);
 324
 325         /*
 326          * Must check for multicast addresses and disallow binding
 327          * to them.
 328          */
 329         sin6p = (struct sockaddr_in6 *)nam;
 330         if (sin6p->sin6_family == AF_INET6 &&
 331             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
 332                 error = EAFNOSUPPORT;
 333                 goto out;
 334         }
 335         inp->inp_vflag &= ~INP_IPV4;
 336         inp->inp_vflag |= INP_IPV6;
 337         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 338                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 339                         inp->inp_vflag |= INP_IPV4;
 340                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 341                         struct sockaddr_in sin;
 342
 343                         in6_sin6_2_sin(&sin, sin6p);
 344                         inp->inp_vflag |= INP_IPV4;
 345                         inp->inp_vflag &= ~INP_IPV6;
 346                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 347                         goto out;
 348                 }
 349         }
 350         error = in6_pcbbind(inp, nam, td);
 351         if (error)
 352                 goto out;
 353         COMMON_END(PRU_BIND);
 354 }
 355 #endif /* INET6 */
 356
 357 struct netmsg_inswildcard {
 358         struct netmsg_base      base;
 359         struct inpcb            *nm_inp;
 360 };
 361
 362 static void
 363 in_pcbinswildcardhash_handler(netmsg_t msg)
 364 {
 365         struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
 366         int cpu = mycpuid, nextcpu;
 367
 368         in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
 369
 370         nextcpu = cpu + 1;
 371         if (nextcpu < ncpus2)
 372                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
 373         else
 374                 lwkt_replymsg(&nm->base.lmsg, 0);
 375 }
 376
 377 /*
 378  * Prepare to accept connections.
 379  */
 380 static void
 381 tcp_usr_listen(netmsg_t msg)
 382 {
 383         struct socket *so = msg->listen.base.nm_so;
 384         struct thread *td = msg->listen.nm_td;
 385         int error = 0;
 386         struct inpcb *inp;
 387         struct tcpcb *tp;
 388         struct netmsg_inswildcard nm;
 389         lwkt_port_t port0 = netisr_cpuport(0);
 390
 391         COMMON_START(so, inp, 0);
 392
 393         if (&curthread->td_msgport != port0) {
 394                 KASSERT((msg->listen.nm_flags & PRUL_RELINK) == 0,
 395                     ("already asked to relink"));
 396
 397                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpuid]);
 398                 sosetport(so, port0);
 399                 msg->listen.nm_flags |= PRUL_RELINK;
 400
 401                 lwkt_forwardmsg(port0, &msg->listen.base.lmsg);
 402                 /* msg invalid now */
 403                 return;
 404         }
 405         KASSERT(so->so_port == port0, ("so_port is not netisr0"));
 406
 407         if (msg->listen.nm_flags & PRUL_RELINK) {
 408                 msg->listen.nm_flags &= ~PRUL_RELINK;
 409                 in_pcblink(so->so_pcb, &tcbinfo[mycpuid]);
 410         }
 411         KASSERT(inp->inp_pcbinfo == &tcbinfo[0], ("pcbinfo is not tcbinfo0"));
 412
 413         if (tp->t_flags & TF_LISTEN)
 414                 goto out;
 415
 416         if (inp->inp_lport == 0) {
 417                 error = in_pcbbind(inp, NULL, td);
 418                 if (error)
 419                         goto out;
 420         }
 421
 422         tp->t_state = TCPS_LISTEN;
 423         tp->t_flags |= TF_LISTEN;
 424         tp->tt_msg = NULL; /* Catch any invalid timer usage */
 425
 426         if (ncpus > 1) {
 427                 /*
 428                  * We have to set the flag because we can't have other cpus
 429                  * messing with our inp's flags.
 430                  */
 431                 KASSERT(!(inp->inp_flags & INP_CONNECTED),
 432                         ("already on connhash"));
 433                 KASSERT(!(inp->inp_flags & INP_WILDCARD),
 434                         ("already on wildcardhash"));
 435                 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
 436                         ("already on MP wildcardhash"));
 437                 inp->inp_flags |= INP_WILDCARD_MP;
 438
 439                 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
 440                             MSGF_PRIORITY, in_pcbinswildcardhash_handler);
 441                 nm.nm_inp = inp;
 442                 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0);
 443         }
 444         in_pcbinswildcardhash(inp);
 445         COMMON_END(PRU_LISTEN);
 446 }
 447
 448 #ifdef INET6
 449
 450 static void
 451 tcp6_usr_listen(netmsg_t msg)
 452 {
 453         struct socket *so = msg->listen.base.nm_so;
 454         struct thread *td = msg->listen.nm_td;
 455         int error = 0;
 456         struct inpcb *inp;
 457         struct tcpcb *tp;
 458         struct netmsg_inswildcard nm;
 459
 460         COMMON_START(so, inp, 0);
 461
 462         if (tp->t_flags & TF_LISTEN)
 463                 goto out;
 464
 465         if (inp->inp_lport == 0) {
 466                 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
 467                         inp->inp_vflag |= INP_IPV4;
 468                 else
 469                         inp->inp_vflag &= ~INP_IPV4;
 470                 error = in6_pcbbind(inp, NULL, td);
 471                 if (error)
 472                         goto out;
 473         }
 474
 475         tp->t_state = TCPS_LISTEN;
 476         tp->t_flags |= TF_LISTEN;
 477         tp->tt_msg = NULL; /* Catch any invalid timer usage */
 478
 479         if (ncpus > 1) {
 480                 /*
 481                  * We have to set the flag because we can't have other cpus
 482                  * messing with our inp's flags.
 483                  */
 484                 KASSERT(!(inp->inp_flags & INP_CONNECTED),
 485                         ("already on connhash"));
 486                 KASSERT(!(inp->inp_flags & INP_WILDCARD),
 487                         ("already on wildcardhash"));
 488                 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
 489                         ("already on MP wildcardhash"));
 490                 inp->inp_flags |= INP_WILDCARD_MP;
 491
 492                 KKASSERT(so->so_port == netisr_cpuport(0));
 493                 KKASSERT(&curthread->td_msgport == netisr_cpuport(0));
 494                 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
 495
 496                 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
 497                             MSGF_PRIORITY, in_pcbinswildcardhash_handler);
 498                 nm.nm_inp = inp;
 499                 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0);
 500         }
 501         in_pcbinswildcardhash(inp);
 502         COMMON_END(PRU_LISTEN);
 503 }
 504 #endif /* INET6 */
 505
 506 /*
 507  * Initiate connection to peer.
 508  * Create a template for use in transmissions on this connection.
 509  * Enter SYN_SENT state, and mark socket as connecting.
 510  * Start keep-alive timer, and seed output sequence space.
 511  * Send initial segment on connection.
 512  */
 513 static void
 514 tcp_usr_connect(netmsg_t msg)
 515 {
 516         struct socket *so = msg->connect.base.nm_so;
 517         struct sockaddr *nam = msg->connect.nm_nam;
 518         struct thread *td = msg->connect.nm_td;
 519         int error = 0;
 520         struct inpcb *inp;
 521         struct tcpcb *tp;
 522         struct sockaddr_in *sinp;
 523
 524         COMMON_START(so, inp, 0);
 525
 526         /*
 527          * Must disallow TCP ``connections'' to multicast addresses.
 528          */
 529         sinp = (struct sockaddr_in *)nam;
 530         if (sinp->sin_family == AF_INET
 531             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 532                 error = EAFNOSUPPORT;
 533                 goto out;
 534         }
 535
 536         if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
 537                 error = EAFNOSUPPORT; /* IPv6 only jail */
 538                 goto out;
 539         }
 540
 541         tcp_connect(msg);
 542         /* msg is invalid now */
 543         return;
 544 out:
 545         if (msg->connect.nm_m) {
 546                 m_freem(msg->connect.nm_m);
 547                 msg->connect.nm_m = NULL;
 548         }
 549         if (msg->connect.nm_flags & PRUC_HELDTD)
 550                 lwkt_rele(td);
 551         if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
 552                 so->so_error = error;
 553                 soisdisconnected(so);
 554         }
 555         lwkt_replymsg(&msg->lmsg, error);
 556 }
 557
 558 #ifdef INET6
 559
 560 static void
 561 tcp6_usr_connect(netmsg_t msg)
 562 {
 563         struct socket *so = msg->connect.base.nm_so;
 564         struct sockaddr *nam = msg->connect.nm_nam;
 565         struct thread *td = msg->connect.nm_td;
 566         int error = 0;
 567         struct inpcb *inp;
 568         struct tcpcb *tp;
 569         struct sockaddr_in6 *sin6p;
 570
 571         COMMON_START(so, inp, 0);
 572
 573         /*
 574          * Must disallow TCP ``connections'' to multicast addresses.
 575          */
 576         sin6p = (struct sockaddr_in6 *)nam;
 577         if (sin6p->sin6_family == AF_INET6
 578             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
 579                 error = EAFNOSUPPORT;
 580                 goto out;
 581         }
 582
 583         if (!prison_remote_ip(td, nam)) {
 584                 error = EAFNOSUPPORT; /* IPv4 only jail */
 585                 goto out;
 586         }
 587
 588         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 589                 struct sockaddr_in *sinp;
 590
 591                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 592                         error = EINVAL;
 593                         goto out;
 594                 }
 595                 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
 596                 in6_sin6_2_sin(sinp, sin6p);
 597                 inp->inp_vflag |= INP_IPV4;
 598                 inp->inp_vflag &= ~INP_IPV6;
 599                 msg->connect.nm_nam = (struct sockaddr *)sinp;
 600                 msg->connect.nm_flags |= PRUC_NAMALLOC;
 601                 tcp_connect(msg);
 602                 /* msg is invalid now */
 603                 return;
 604         }
 605         inp->inp_vflag &= ~INP_IPV4;
 606         inp->inp_vflag |= INP_IPV6;
 607         inp->inp_inc.inc_isipv6 = 1;
 608
 609         msg->connect.nm_flags |= PRUC_FALLBACK;
 610         tcp6_connect(msg);
 611         /* msg is invalid now */
 612         return;
 613 out:
 614         if (msg->connect.nm_m) {
 615                 m_freem(msg->connect.nm_m);
 616                 msg->connect.nm_m = NULL;
 617         }
 618         lwkt_replymsg(&msg->lmsg, error);
 619 }
 620
 621 #endif /* INET6 */
 622
 623 /*
 624  * Initiate disconnect from peer.
 625  * If connection never passed embryonic stage, just drop;
 626  * else if don't need to let data drain, then can just drop anyways,
 627  * else have to begin TCP shutdown process: mark socket disconnecting,
 628  * drain unread data, state switch to reflect user close, and
 629  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 630  * when peer sends FIN and acks ours.
 631  *
 632  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 633  */
 634 static void
 635 tcp_usr_disconnect(netmsg_t msg)
 636 {
 637         struct socket *so = msg->disconnect.base.nm_so;
 638         int error = 0;
 639         struct inpcb *inp;
 640         struct tcpcb *tp;
 641
 642         COMMON_START(so, inp, 1);
 643         tp = tcp_disconnect(tp);
 644         COMMON_END(PRU_DISCONNECT);
 645 }
 646
 647 /*
 648  * Accept a connection.  Essentially all the work is
 649  * done at higher levels; just return the address
 650  * of the peer, storing through addr.
 651  */
 652 static void
 653 tcp_usr_accept(netmsg_t msg)
 654 {
 655         struct socket *so = msg->accept.base.nm_so;
 656         struct sockaddr **nam = msg->accept.nm_nam;
 657         int error = 0;
 658         struct inpcb *inp;
 659         struct tcpcb *tp = NULL;
 660         TCPDEBUG0;
 661
 662         inp = so->so_pcb;
 663         if (so->so_state & SS_ISDISCONNECTED) {
 664                 error = ECONNABORTED;
 665                 goto out;
 666         }
 667         if (inp == 0) {
 668                 error = EINVAL;
 669                 goto out;
 670         }
 671
 672         tp = intotcpcb(inp);
 673         TCPDEBUG1();
 674         in_setpeeraddr(so, nam);
 675         COMMON_END(PRU_ACCEPT);
 676 }
 677
 678 #ifdef INET6
 679 static void
 680 tcp6_usr_accept(netmsg_t msg)
 681 {
 682         struct socket *so = msg->accept.base.nm_so;
 683         struct sockaddr **nam = msg->accept.nm_nam;
 684         int error = 0;
 685         struct inpcb *inp;
 686         struct tcpcb *tp = NULL;
 687         TCPDEBUG0;
 688
 689         inp = so->so_pcb;
 690
 691         if (so->so_state & SS_ISDISCONNECTED) {
 692                 error = ECONNABORTED;
 693                 goto out;
 694         }
 695         if (inp == 0) {
 696                 error = EINVAL;
 697                 goto out;
 698         }
 699         tp = intotcpcb(inp);
 700         TCPDEBUG1();
 701         in6_mapped_peeraddr(so, nam);
 702         COMMON_END(PRU_ACCEPT);
 703 }
 704 #endif /* INET6 */
 705 /*
 706  * Mark the connection as being incapable of further output.
 707  */
 708 static void
 709 tcp_usr_shutdown(netmsg_t msg)
 710 {
 711         struct socket *so = msg->shutdown.base.nm_so;
 712         int error = 0;
 713         struct inpcb *inp;
 714         struct tcpcb *tp;
 715
 716         COMMON_START(so, inp, 0);
 717         socantsendmore(so);
 718         tp = tcp_usrclosed(tp);
 719         if (tp)
 720                 error = tcp_output(tp);
 721         COMMON_END(PRU_SHUTDOWN);
 722 }
 723
 724 /*
 725  * After a receive, possibly send window update to peer.
 726  */
 727 static void
 728 tcp_usr_rcvd(netmsg_t msg)
 729 {
 730         struct socket *so = msg->rcvd.base.nm_so;
 731         int error = 0, noreply = 0;
 732         struct inpcb *inp;
 733         struct tcpcb *tp;
 734
 735         COMMON_START(so, inp, 0);
 736
 737         if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) {
 738                 noreply = 1;
 739                 so_async_rcvd_reply(so);
 740         }
 741         tcp_output(tp);
 742
 743         COMMON_END1(PRU_RCVD, noreply);
 744 }
 745
 746 /*
 747  * Do a send by putting data in output queue and updating urgent
 748  * marker if URG set.  Possibly send more data.  Unlike the other
 749  * pru_*() routines, the mbuf chains are our responsibility.  We
 750  * must either enqueue them or free them.  The other pru_* routines
 751  * generally are caller-frees.
 752  */
 753 static void
 754 tcp_usr_send(netmsg_t msg)
 755 {
 756         struct socket *so = msg->send.base.nm_so;
 757         int flags = msg->send.nm_flags;
 758         struct mbuf *m = msg->send.nm_m;
 759         int error = 0;
 760         struct inpcb *inp;
 761         struct tcpcb *tp;
 762         TCPDEBUG0;
 763
 764         KKASSERT(msg->send.nm_control == NULL);
 765         KKASSERT(msg->send.nm_addr == NULL);
 766         KKASSERT((flags & PRUS_FREEADDR) == 0);
 767
 768         inp = so->so_pcb;
 769
 770         if (inp == NULL) {
 771                 /*
 772                  * OOPS! we lost a race, the TCP session got reset after
 773                  * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
 774                  * network interrupt in the non-critical section of sosend().
 775                  */
 776                 m_freem(m);
 777                 error = ECONNRESET;     /* XXX EPIPE? */
 778                 tp = NULL;
 779                 TCPDEBUG1();
 780                 goto out;
 781         }
 782         tp = intotcpcb(inp);
 783         TCPDEBUG1();
 784
 785 #ifdef foo
 786         /*
 787          * This is no longer necessary, since:
 788          * - sosendtcp() has already checked it for us
 789          * - It does not work with asynchronized send
 790          */
 791
 792         /*
 793          * Don't let too much OOB data build up
 794          */
 795         if (flags & PRUS_OOB) {
 796                 if (ssb_space(&so->so_snd) < -512) {
 797                         m_freem(m);
 798                         error = ENOBUFS;
 799                         goto out;
 800                 }
 801         }
 802 #endif
 803
 804         /*
 805          * Pump the data into the socket.
 806          */
 807         if (m)
 808                 ssb_appendstream(&so->so_snd, m);
 809         if (flags & PRUS_OOB) {
 810                 /*
 811                  * According to RFC961 (Assigned Protocols),
 812                  * the urgent pointer points to the last octet
 813                  * of urgent data.  We continue, however,
 814                  * to consider it to indicate the first octet
 815                  * of data past the urgent section.
 816                  * Otherwise, snd_up should be one lower.
 817                  */
 818                 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
 819                 tp->t_flags |= TF_FORCE;
 820                 error = tcp_output(tp);
 821                 tp->t_flags &= ~TF_FORCE;
 822         } else {
 823                 if (flags & PRUS_EOF) {
 824                         /*
 825                          * Close the send side of the connection after
 826                          * the data is sent.
 827                          */
 828                         socantsendmore(so);
 829                         tp = tcp_usrclosed(tp);
 830                 }
 831                 if (tp != NULL && !tcp_output_pending(tp)) {
 832                         if (flags & PRUS_MORETOCOME)
 833                                 tp->t_flags |= TF_MORETOCOME;
 834                         error = tcp_output_fair(tp);
 835                         if (flags & PRUS_MORETOCOME)
 836                                 tp->t_flags &= ~TF_MORETOCOME;
 837                 }
 838         }
 839         COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
 840                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
 841                    (flags & PRUS_NOREPLY));
 842 }
 843
 844 /*
 845  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 846  *       will sofree() it when we return.
 847  */
 848 static void
 849 tcp_usr_abort(netmsg_t msg)
 850 {
 851         struct socket *so = msg->abort.base.nm_so;
 852         int error = 0;
 853         struct inpcb *inp;
 854         struct tcpcb *tp;
 855
 856         COMMON_START(so, inp, 1);
 857         tp = tcp_drop(tp, ECONNABORTED);
 858         COMMON_END(PRU_ABORT);
 859 }
 860
 861 /*
 862  * Receive out-of-band data.
 863  */
 864 static void
 865 tcp_usr_rcvoob(netmsg_t msg)
 866 {
 867         struct socket *so = msg->rcvoob.base.nm_so;
 868         struct mbuf *m = msg->rcvoob.nm_m;
 869         int flags = msg->rcvoob.nm_flags;
 870         int error = 0;
 871         struct inpcb *inp;
 872         struct tcpcb *tp;
 873
 874         COMMON_START(so, inp, 0);
 875         if ((so->so_oobmark == 0 &&
 876              (so->so_state & SS_RCVATMARK) == 0) ||
 877             so->so_options & SO_OOBINLINE ||
 878             tp->t_oobflags & TCPOOB_HADDATA) {
 879                 error = EINVAL;
 880                 goto out;
 881         }
 882         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
 883                 error = EWOULDBLOCK;
 884                 goto out;
 885         }
 886         m->m_len = 1;
 887         *mtod(m, caddr_t) = tp->t_iobc;
 888         if ((flags & MSG_PEEK) == 0)
 889                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
 890         COMMON_END(PRU_RCVOOB);
 891 }
 892
 893 static void
 894 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
 895 {
 896         in_savefaddr(so, faddr);
 897 }
 898
 899 #ifdef INET6
 900 static void
 901 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
 902 {
 903         in6_mapped_savefaddr(so, faddr);
 904 }
 905 #endif
 906
 907 static int
 908 tcp_usr_preconnect(struct socket *so, const struct sockaddr *nam,
 909     struct thread *td __unused)
 910 {
 911         const struct sockaddr_in *sinp;
 912
 913         sinp = (const struct sockaddr_in *)nam;
 914         if (sinp->sin_family == AF_INET &&
 915             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 916                 return EAFNOSUPPORT;
 917
 918         soisconnecting(so);
 919         return 0;
 920 }
 921
 922 /* xxx - should be const */
 923 struct pr_usrreqs tcp_usrreqs = {
 924         .pru_abort = tcp_usr_abort,
 925         .pru_accept = tcp_usr_accept,
 926         .pru_attach = tcp_usr_attach,
 927         .pru_bind = tcp_usr_bind,
 928         .pru_connect = tcp_usr_connect,
 929         .pru_connect2 = pr_generic_notsupp,
 930         .pru_control = in_control_dispatch,
 931         .pru_detach = tcp_usr_detach,
 932         .pru_disconnect = tcp_usr_disconnect,
 933         .pru_listen = tcp_usr_listen,
 934         .pru_peeraddr = in_setpeeraddr_dispatch,
 935         .pru_rcvd = tcp_usr_rcvd,
 936         .pru_rcvoob = tcp_usr_rcvoob,
 937         .pru_send = tcp_usr_send,
 938         .pru_sense = pru_sense_null,
 939         .pru_shutdown = tcp_usr_shutdown,
 940         .pru_sockaddr = in_setsockaddr_dispatch,
 941         .pru_sosend = sosendtcp,
 942         .pru_soreceive = sorecvtcp,
 943         .pru_savefaddr = tcp_usr_savefaddr,
 944         .pru_preconnect = tcp_usr_preconnect
 945 };
 946
 947 #ifdef INET6
 948 struct pr_usrreqs tcp6_usrreqs = {
 949         .pru_abort = tcp_usr_abort,
 950         .pru_accept = tcp6_usr_accept,
 951         .pru_attach = tcp_usr_attach,
 952         .pru_bind = tcp6_usr_bind,
 953         .pru_connect = tcp6_usr_connect,
 954         .pru_connect2 = pr_generic_notsupp,
 955         .pru_control = in6_control_dispatch,
 956         .pru_detach = tcp_usr_detach,
 957         .pru_disconnect = tcp_usr_disconnect,
 958         .pru_listen = tcp6_usr_listen,
 959         .pru_peeraddr = in6_mapped_peeraddr_dispatch,
 960         .pru_rcvd = tcp_usr_rcvd,
 961         .pru_rcvoob = tcp_usr_rcvoob,
 962         .pru_send = tcp_usr_send,
 963         .pru_sense = pru_sense_null,
 964         .pru_shutdown = tcp_usr_shutdown,
 965         .pru_sockaddr = in6_mapped_sockaddr_dispatch,
 966         .pru_sosend = sosendtcp,
 967         .pru_soreceive = sorecvtcp,
 968         .pru_savefaddr = tcp6_usr_savefaddr
 969 };
 970 #endif /* INET6 */
 971
 972 static int
 973 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
 974                   struct sockaddr_in *sin, struct sockaddr_in *if_sin)
 975 {
 976         struct inpcb *inp = tp->t_inpcb, *oinp;
 977         struct socket *so = inp->inp_socket;
 978         struct route *ro = &inp->inp_route;
 979
 980         KASSERT(inp->inp_pcbinfo == &tcbinfo[mycpu->gd_cpuid],
 981             ("pcbinfo mismatch"));
 982
 983         oinp = in_pcblookup_hash(inp->inp_pcbinfo,
 984                                  sin->sin_addr, sin->sin_port,
 985                                  (inp->inp_laddr.s_addr != INADDR_ANY ?
 986                                   inp->inp_laddr : if_sin->sin_addr),
 987                                 inp->inp_lport, 0, NULL);
 988         if (oinp != NULL) {
 989                 m_freem(m);
 990                 return (EADDRINUSE);
 991         }
 992         if (inp->inp_laddr.s_addr == INADDR_ANY)
 993                 inp->inp_laddr = if_sin->sin_addr;
 994         inp->inp_faddr = sin->sin_addr;
 995         inp->inp_fport = sin->sin_port;
 996         in_pcbinsconnhash(inp);
 997
 998         /*
 999          * We are now on the inpcb's owner CPU, if the cached route was
1000          * freed because the rtentry's owner CPU is not the current CPU
1001          * (e.g. in tcp_connect()), then we try to reallocate it here with
1002          * the hope that a rtentry may be cloned from a RTF_PRCLONING
1003          * rtentry.
1004          */
1005         if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
1006             ro->ro_rt == NULL) {
1007                 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
1008                 ro->ro_dst.sa_family = AF_INET;
1009                 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
1010                 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
1011                         sin->sin_addr;
1012                 rtalloc(ro);
1013         }
1014
1015         /*
1016          * Now that no more errors can occur, change the protocol processing
1017          * port to the current thread (which is the correct thread).
1018          *
1019          * Create TCP timer message now; we are on the tcpcb's owner
1020          * CPU/thread.
1021          */
1022         tcp_create_timermsg(tp, &curthread->td_msgport);
1023
1024         /*
1025          * Compute window scaling to request.  Use a larger scaling then
1026          * needed for the initial receive buffer in case the receive buffer
1027          * gets expanded.
1028          */
1029         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1030                 tp->request_r_scale = TCP_MIN_WINSHIFT;
1031         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1032                (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
1033         ) {
1034                 tp->request_r_scale++;
1035         }
1036
1037         soisconnecting(so);
1038         tcpstat.tcps_connattempt++;
1039         tp->t_state = TCPS_SYN_SENT;
1040         tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1041         tp->iss = tcp_new_isn(tp);
1042         tcp_sendseqinit(tp);
1043         if (m) {
1044                 ssb_appendstream(&so->so_snd, m);
1045                 m = NULL;
1046                 if (flags & PRUS_OOB)
1047                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1048         }
1049
1050         /*
1051          * Close the send side of the connection after
1052          * the data is sent if flagged.
1053          */
1054         if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1055                 socantsendmore(so);
1056                 tp = tcp_usrclosed(tp);
1057         }
1058         return (tcp_output(tp));
1059 }
1060
1061 /*
1062  * Common subroutine to open a TCP connection to remote host specified
1063  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1064  * port number if needed.  Call in_pcbladdr to do the routing and to choose
1065  * a local host address (interface).
1066  * Initialize connection parameters and enter SYN-SENT state.
1067  */
1068 static void
1069 tcp_connect(netmsg_t msg)
1070 {
1071         struct socket *so = msg->connect.base.nm_so;
1072         struct sockaddr *nam = msg->connect.nm_nam;
1073         struct thread *td = msg->connect.nm_td;
1074         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1075         struct sockaddr_in *if_sin = NULL;
1076         struct inpcb *inp;
1077         struct tcpcb *tp;
1078         int error;
1079         lwkt_port_t port;
1080
1081         COMMON_START(so, inp, 0);
1082
1083         /*
1084          * Reconnect our pcb if we have to
1085          */
1086         if (msg->connect.nm_flags & PRUC_RECONNECT) {
1087                 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1088                 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1089         }
1090
1091         /*
1092          * Bind if we have to
1093          */
1094         if (inp->inp_lport == 0) {
1095                 if (tcp_lport_extension) {
1096                         KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1097
1098                         error = in_pcbladdr(inp, nam, &if_sin, td);
1099                         if (error)
1100                                 goto out;
1101                         inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1102
1103                         error = in_pcbbind_remote(inp, nam, td);
1104                         if (error)
1105                                 goto out;
1106
1107                         msg->connect.nm_flags |= PRUC_HASLADDR;
1108                 } else {
1109                         error = in_pcbbind(inp, NULL, td);
1110                         if (error)
1111                                 goto out;
1112                 }
1113         }
1114
1115         if ((msg->connect.nm_flags & PRUC_HASLADDR) == 0) {
1116                 /*
1117                  * Calculate the correct protocol processing thread.  The
1118                  * connect operation must run there.  Set the forwarding
1119                  * port before we forward the message or it will get bounced
1120                  * right back to us.
1121                  */
1122                 error = in_pcbladdr(inp, nam, &if_sin, td);
1123                 if (error)
1124                         goto out;
1125         }
1126         KKASSERT(inp->inp_socket == so);
1127
1128         port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1129                             (inp->inp_laddr.s_addr != INADDR_ANY ?
1130                              inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1131                             inp->inp_lport);
1132
1133         if (port != &curthread->td_msgport) {
1134                 struct route *ro = &inp->inp_route;
1135
1136                 /*
1137                  * in_pcbladdr() may have allocated a route entry for us
1138                  * on the current CPU, but we need a route entry on the
1139                  * inpcb's owner CPU, so free it here.
1140                  */
1141                 if (ro->ro_rt != NULL)
1142                         RTFREE(ro->ro_rt);
1143                 bzero(ro, sizeof(*ro));
1144
1145                 /*
1146                  * We are moving the protocol processing port the socket
1147                  * is on, we have to unlink here and re-link on the
1148                  * target cpu.
1149                  */
1150                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1151                 sosetport(so, port);
1152                 msg->connect.nm_flags |= PRUC_RECONNECT;
1153                 msg->connect.base.nm_dispatch = tcp_connect;
1154
1155                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1156                 /* msg invalid now */
1157                 return;
1158         } else if (msg->connect.nm_flags & PRUC_HELDTD) {
1159                 /*
1160                  * The original thread is no longer needed; release it.
1161                  */
1162                 lwkt_rele(td);
1163                 msg->connect.nm_flags &= ~PRUC_HELDTD;
1164         }
1165         error = tcp_connect_oncpu(tp, msg->connect.nm_sndflags,
1166                                   msg->connect.nm_m, sin, if_sin);
1167         msg->connect.nm_m = NULL;
1168 out:
1169         if (msg->connect.nm_m) {
1170                 m_freem(msg->connect.nm_m);
1171                 msg->connect.nm_m = NULL;
1172         }
1173         if (msg->connect.nm_flags & PRUC_NAMALLOC) {
1174                 kfree(msg->connect.nm_nam, M_LWKTMSG);
1175                 msg->connect.nm_nam = NULL;
1176         }
1177         if (msg->connect.nm_flags & PRUC_HELDTD)
1178                 lwkt_rele(td);
1179         if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
1180                 so->so_error = error;
1181                 soisdisconnected(so);
1182         }
1183         lwkt_replymsg(&msg->connect.base.lmsg, error);
1184         /* msg invalid now */
1185 }
1186
1187 #ifdef INET6
1188
1189 static void
1190 tcp6_connect(netmsg_t msg)
1191 {
1192         struct tcpcb *tp;
1193         struct socket *so = msg->connect.base.nm_so;
1194         struct sockaddr *nam = msg->connect.nm_nam;
1195         struct thread *td = msg->connect.nm_td;
1196         struct inpcb *inp;
1197         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1198         struct in6_addr *addr6;
1199         lwkt_port_t port;
1200         int error;
1201
1202         COMMON_START(so, inp, 0);
1203
1204         /*
1205          * Reconnect our pcb if we have to
1206          */
1207         if (msg->connect.nm_flags & PRUC_RECONNECT) {
1208                 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1209                 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1210         }
1211
1212         /*
1213          * Bind if we have to
1214          */
1215         if (inp->inp_lport == 0) {
1216                 error = in6_pcbbind(inp, NULL, td);
1217                 if (error)
1218                         goto out;
1219         }
1220
1221         /*
1222          * Cannot simply call in_pcbconnect, because there might be an
1223          * earlier incarnation of this same connection still in
1224          * TIME_WAIT state, creating an ADDRINUSE error.
1225          */
1226         error = in6_pcbladdr(inp, nam, &addr6, td);
1227         if (error)
1228                 goto out;
1229
1230         port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1231
1232         if (port != &curthread->td_msgport) {
1233                 struct route *ro = &inp->inp_route;
1234
1235                 /*
1236                  * in_pcbladdr() may have allocated a route entry for us
1237                  * on the current CPU, but we need a route entry on the
1238                  * inpcb's owner CPU, so free it here.
1239                  */
1240                 if (ro->ro_rt != NULL)
1241                         RTFREE(ro->ro_rt);
1242                 bzero(ro, sizeof(*ro));
1243
1244                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1245                 sosetport(so, port);
1246                 msg->connect.nm_flags |= PRUC_RECONNECT;
1247                 msg->connect.base.nm_dispatch = tcp6_connect;
1248
1249                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1250                 /* msg invalid now */
1251                 return;
1252         }
1253         error = tcp6_connect_oncpu(tp, msg->connect.nm_sndflags,
1254                                    &msg->connect.nm_m, sin6, addr6);
1255         /* nm_m may still be intact */
1256 out:
1257         if (error && (msg->connect.nm_flags & PRUC_FALLBACK)) {
1258                 tcp_connect(msg);
1259                 /* msg invalid now */
1260         } else {
1261                 if (msg->connect.nm_m) {
1262                         m_freem(msg->connect.nm_m);
1263                         msg->connect.nm_m = NULL;
1264                 }
1265                 if (msg->connect.nm_flags & PRUC_NAMALLOC) {
1266                         kfree(msg->connect.nm_nam, M_LWKTMSG);
1267                         msg->connect.nm_nam = NULL;
1268                 }
1269                 lwkt_replymsg(&msg->connect.base.lmsg, error);
1270                 /* msg invalid now */
1271         }
1272 }
1273
1274 static int
1275 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1276                    struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1277 {
1278         struct mbuf *m = *mp;
1279         struct inpcb *inp = tp->t_inpcb;
1280         struct socket *so = inp->inp_socket;
1281         struct inpcb *oinp;
1282
1283         /*
1284          * Cannot simply call in_pcbconnect, because there might be an
1285          * earlier incarnation of this same connection still in
1286          * TIME_WAIT state, creating an ADDRINUSE error.
1287          */
1288         oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1289                                   &sin6->sin6_addr, sin6->sin6_port,
1290                                   (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1291                                       addr6 : &inp->in6p_laddr),
1292                                   inp->inp_lport,  0, NULL);
1293         if (oinp)
1294                 return (EADDRINUSE);
1295
1296         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1297                 inp->in6p_laddr = *addr6;
1298         inp->in6p_faddr = sin6->sin6_addr;
1299         inp->inp_fport = sin6->sin6_port;
1300         if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1301                 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1302         in_pcbinsconnhash(inp);
1303
1304         /*
1305          * Now that no more errors can occur, change the protocol processing
1306          * port to the current thread (which is the correct thread).
1307          *
1308          * Create TCP timer message now; we are on the tcpcb's owner
1309          * CPU/thread.
1310          */
1311         tcp_create_timermsg(tp, &curthread->td_msgport);
1312
1313         /* Compute window scaling to request.  */
1314         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1315                 tp->request_r_scale = TCP_MIN_WINSHIFT;
1316         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1317             (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1318                 tp->request_r_scale++;
1319         }
1320
1321         soisconnecting(so);
1322         tcpstat.tcps_connattempt++;
1323         tp->t_state = TCPS_SYN_SENT;
1324         tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1325         tp->iss = tcp_new_isn(tp);
1326         tcp_sendseqinit(tp);
1327         if (m) {
1328                 ssb_appendstream(&so->so_snd, m);
1329                 *mp = NULL;
1330                 if (flags & PRUS_OOB)
1331                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1332         }
1333
1334         /*
1335          * Close the send side of the connection after
1336          * the data is sent if flagged.
1337          */
1338         if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1339                 socantsendmore(so);
1340                 tp = tcp_usrclosed(tp);
1341         }
1342         return (tcp_output(tp));
1343 }
1344
1345 #endif /* INET6 */
1346
1347 /*
1348  * The new sockopt interface makes it possible for us to block in the
1349  * copyin/out step (if we take a page fault).  Taking a page fault while
1350  * in a critical section is probably a Bad Thing.  (Since sockets and pcbs
1351  * both now use TSM, there probably isn't any need for this function to
1352  * run in a critical section any more.  This needs more examination.)
1353  */
1354 void
1355 tcp_ctloutput(netmsg_t msg)
1356 {
1357         struct socket *so = msg->base.nm_so;
1358         struct sockopt *sopt = msg->ctloutput.nm_sopt;
1359         int     error, opt, optval, opthz;
1360         struct  inpcb *inp;
1361         struct  tcpcb *tp;
1362
1363         error = 0;
1364         inp = so->so_pcb;
1365         if (inp == NULL) {
1366                 error = ECONNRESET;
1367                 goto done;
1368         }
1369
1370         if (sopt->sopt_level != IPPROTO_TCP) {
1371                 switch (sopt->sopt_name) {
1372                 case IP_MULTICAST_IF:
1373                 case IP_MULTICAST_VIF:
1374                 case IP_MULTICAST_TTL:
1375                 case IP_MULTICAST_LOOP:
1376                 case IP_ADD_MEMBERSHIP:
1377                 case IP_DROP_MEMBERSHIP:
1378                         /*
1379                          * Multicast does not make sense on TCP sockets.
1380                          */
1381                         error = EOPNOTSUPP;
1382                         goto done;
1383                 }
1384 #ifdef INET6
1385                 if (INP_CHECK_SOCKAF(so, AF_INET6))
1386                         ip6_ctloutput_dispatch(msg);
1387                 else
1388 #endif /* INET6 */
1389                 ip_ctloutput(msg);
1390                 /* msg invalid now */
1391                 return;
1392         }
1393         tp = intotcpcb(inp);
1394
1395         switch (sopt->sopt_dir) {
1396         case SOPT_SET:
1397                 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1398                                       sizeof optval);
1399                 if (error)
1400                         break;
1401                 switch (sopt->sopt_name) {
1402                 case TCP_FASTKEEP:
1403                         if (optval > 0)
1404                                 tp->t_keepidle = tp->t_keepintvl;
1405                         else
1406                                 tp->t_keepidle = tcp_keepidle;
1407                         tcp_timer_keep_activity(tp, 0);
1408                         break;
1409 #ifdef TCP_SIGNATURE
1410                 case TCP_SIGNATURE_ENABLE:
1411                         if (tp->t_state == TCPS_CLOSED) {
1412                                 /*
1413                                  * This is the only safe state that this
1414                                  * option could be changed.  Some segments
1415                                  * could already have been sent in other
1416                                  * states.
1417                                  */
1418                                 if (optval > 0)
1419                                         tp->t_flags |= TF_SIGNATURE;
1420                                 else
1421                                         tp->t_flags &= ~TF_SIGNATURE;
1422                         } else {
1423                                 error = EOPNOTSUPP;
1424                         }
1425                         break;
1426 #endif /* TCP_SIGNATURE */
1427                 case TCP_NODELAY:
1428                 case TCP_NOOPT:
1429                         switch (sopt->sopt_name) {
1430                         case TCP_NODELAY:
1431                                 opt = TF_NODELAY;
1432                                 break;
1433                         case TCP_NOOPT:
1434                                 opt = TF_NOOPT;
1435                                 break;
1436                         default:
1437                                 opt = 0; /* dead code to fool gcc */
1438                                 break;
1439                         }
1440
1441                         if (optval)
1442                                 tp->t_flags |= opt;
1443                         else
1444                                 tp->t_flags &= ~opt;
1445                         break;
1446
1447                 case TCP_NOPUSH:
1448                         if (tcp_disable_nopush)
1449                                 break;
1450                         if (optval)
1451                                 tp->t_flags |= TF_NOPUSH;
1452                         else {
1453                                 tp->t_flags &= ~TF_NOPUSH;
1454                                 error = tcp_output(tp);
1455                         }
1456                         break;
1457
1458                 case TCP_MAXSEG:
1459                         /*
1460                          * Must be between 0 and maxseg.  If the requested
1461                          * maxseg is too small to satisfy the desired minmss,
1462                          * pump it up (silently so sysctl modifications of
1463                          * minmss do not create unexpected program failures).
1464                          * Handle degenerate cases.
1465                          */
1466                         if (optval > 0 && optval <= tp->t_maxseg) {
1467                                 if (optval + 40 < tcp_minmss) {
1468                                         optval = tcp_minmss - 40;
1469                                         if (optval < 0)
1470                                                 optval = 1;
1471                                 }
1472                                 tp->t_maxseg = optval;
1473                         } else {
1474                                 error = EINVAL;
1475                         }
1476                         break;
1477
1478                 case TCP_KEEPINIT:
1479                         opthz = ((int64_t)optval * hz) / 1000;
1480                         if (opthz >= 1)
1481                                 tp->t_keepinit = opthz;
1482                         else
1483                                 error = EINVAL;
1484                         break;
1485
1486                 case TCP_KEEPIDLE:
1487                         opthz = ((int64_t)optval * hz) / 1000;
1488                         if (opthz >= 1) {
1489                                 tp->t_keepidle = opthz;
1490                                 tcp_timer_keep_activity(tp, 0);
1491                         } else {
1492                                 error = EINVAL;
1493                         }
1494                         break;
1495
1496                 case TCP_KEEPINTVL:
1497                         opthz = ((int64_t)optval * hz) / 1000;
1498                         if (opthz >= 1) {
1499                                 tp->t_keepintvl = opthz;
1500                                 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1501                         } else {
1502                                 error = EINVAL;
1503                         }
1504                         break;
1505
1506                 case TCP_KEEPCNT:
1507                         if (optval > 0) {
1508                                 tp->t_keepcnt = optval;
1509                                 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1510                         } else {
1511                                 error = EINVAL;
1512                         }
1513                         break;
1514
1515                 default:
1516                         error = ENOPROTOOPT;
1517                         break;
1518                 }
1519                 break;
1520
1521         case SOPT_GET:
1522                 switch (sopt->sopt_name) {
1523 #ifdef TCP_SIGNATURE
1524                 case TCP_SIGNATURE_ENABLE:
1525                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1526                         break;
1527 #endif /* TCP_SIGNATURE */
1528                 case TCP_NODELAY:
1529                         optval = tp->t_flags & TF_NODELAY;
1530                         break;
1531                 case TCP_MAXSEG:
1532                         optval = tp->t_maxseg;
1533                         break;
1534                 case TCP_NOOPT:
1535                         optval = tp->t_flags & TF_NOOPT;
1536                         break;
1537                 case TCP_NOPUSH:
1538                         optval = tp->t_flags & TF_NOPUSH;
1539                         break;
1540                 case TCP_KEEPINIT:
1541                         optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1542                         break;
1543                 case TCP_KEEPIDLE:
1544                         optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1545                         break;
1546                 case TCP_KEEPINTVL:
1547                         optval = ((int64_t)tp->t_keepintvl * 1000) / hz;
1548                         break;
1549                 case TCP_KEEPCNT:
1550                         optval = tp->t_keepcnt;
1551                         break;
1552                 default:
1553                         error = ENOPROTOOPT;
1554                         break;
1555                 }
1556                 if (error == 0)
1557                         soopt_from_kbuf(sopt, &optval, sizeof optval);
1558                 break;
1559         }
1560 done:
1561         lwkt_replymsg(&msg->lmsg, error);
1562 }
1563
1564 /*
1565  * tcp_sendspace and tcp_recvspace are the default send and receive window
1566  * sizes, respectively.  These are obsolescent (this information should
1567  * be set by the route).
1568  *
1569  * Use a default that does not require tcp window scaling to be turned
1570  * on.  Individual programs or the administrator can increase the default.
1571  */
1572 u_long  tcp_sendspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1573 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1574     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1575 u_long  tcp_recvspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1576 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1577     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1578
1579 /*
1580  * Attach TCP protocol to socket, allocating internet protocol control
1581  * block, tcp control block, buffer space, and entering CLOSED state.
1582  */
1583 static int
1584 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1585 {
1586         struct tcpcb *tp;
1587         struct inpcb *inp;
1588         int error;
1589         int cpu;
1590 #ifdef INET6
1591         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1592 #endif
1593
1594         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
1595                 lwkt_gettoken(&so->so_rcv.ssb_token);
1596                 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1597                                   ai->sb_rlimit);
1598                 lwkt_reltoken(&so->so_rcv.ssb_token);
1599                 if (error)
1600                         return (error);
1601         }
1602         atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1603         atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
1604         cpu = mycpu->gd_cpuid;
1605
1606         /*
1607          * Set the default port for protocol processing. This will likely
1608          * change when we connect.
1609          */
1610         error = in_pcballoc(so, &tcbinfo[cpu]);
1611         if (error)
1612                 return (error);
1613         inp = so->so_pcb;
1614 #ifdef INET6
1615         if (isipv6) {
1616                 inp->inp_vflag |= INP_IPV6;
1617                 inp->in6p_hops = -1;    /* use kernel default */
1618         }
1619         else
1620 #endif
1621         inp->inp_vflag |= INP_IPV4;
1622         tp = tcp_newtcpcb(inp);
1623         if (tp == NULL) {
1624                 /*
1625                  * Make sure the socket is destroyed by the pcbdetach.
1626                  */
1627                 soreference(so);
1628 #ifdef INET6
1629                 if (isipv6)
1630                         in6_pcbdetach(inp);
1631                 else
1632 #endif
1633                 in_pcbdetach(inp);
1634                 sofree(so);     /* from ref above */
1635                 return (ENOBUFS);
1636         }
1637         tp->t_state = TCPS_CLOSED;
1638         /* Keep a reference for asynchronized pru_rcvd */
1639         soreference(so);
1640         return (0);
1641 }
1642
1643 /*
1644  * Initiate (or continue) disconnect.
1645  * If embryonic state, just send reset (once).
1646  * If in ``let data drain'' option and linger null, just drop.
1647  * Otherwise (hard), mark socket disconnecting and drop
1648  * current input data; switch states based on user close, and
1649  * send segment to peer (with FIN).
1650  */
1651 static struct tcpcb *
1652 tcp_disconnect(struct tcpcb *tp)
1653 {
1654         struct socket *so = tp->t_inpcb->inp_socket;
1655
1656         if (tp->t_state < TCPS_ESTABLISHED) {
1657                 tp = tcp_close(tp);
1658         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1659                 tp = tcp_drop(tp, 0);
1660         } else {
1661                 lwkt_gettoken(&so->so_rcv.ssb_token);
1662                 soisdisconnecting(so);
1663                 sbflush(&so->so_rcv.sb);
1664                 tp = tcp_usrclosed(tp);
1665                 if (tp)
1666                         tcp_output(tp);
1667                 lwkt_reltoken(&so->so_rcv.ssb_token);
1668         }
1669         return (tp);
1670 }
1671
1672 /*
1673  * User issued close, and wish to trail through shutdown states:
1674  * if never received SYN, just forget it.  If got a SYN from peer,
1675  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1676  * If already got a FIN from peer, then almost done; go to LAST_ACK
1677  * state.  In all other cases, have already sent FIN to peer (e.g.
1678  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1679  * for peer to send FIN or not respond to keep-alives, etc.
1680  * We can let the user exit from the close as soon as the FIN is acked.
1681  */
1682 static struct tcpcb *
1683 tcp_usrclosed(struct tcpcb *tp)
1684 {
1685
1686         switch (tp->t_state) {
1687
1688         case TCPS_CLOSED:
1689         case TCPS_LISTEN:
1690                 tp->t_state = TCPS_CLOSED;
1691                 tp = tcp_close(tp);
1692                 break;
1693
1694         case TCPS_SYN_SENT:
1695         case TCPS_SYN_RECEIVED:
1696                 tp->t_flags |= TF_NEEDFIN;
1697                 break;
1698
1699         case TCPS_ESTABLISHED:
1700                 tp->t_state = TCPS_FIN_WAIT_1;
1701                 break;
1702
1703         case TCPS_CLOSE_WAIT:
1704                 tp->t_state = TCPS_LAST_ACK;
1705                 break;
1706         }
1707         if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1708                 soisdisconnected(tp->t_inpcb->inp_socket);
1709                 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1710                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1711                         tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,
1712                             tcp_timer_2msl);
1713                 }
1714         }
1715         return (tp);
1716 }