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  * $DragonFly: src/sys/netinet/tcp_usrreq.c,v 1.51 2008/09/29 20:52:23 dillon Exp $
  69  */
  70
  71 #include "opt_ipsec.h"
  72 #include "opt_inet.h"
  73 #include "opt_inet6.h"
  74 #include "opt_tcpdebug.h"
  75
  76 #include <sys/param.h>
  77 #include <sys/systm.h>
  78 #include <sys/kernel.h>
  79 #include <sys/malloc.h>
  80 #include <sys/sysctl.h>
  81 #include <sys/globaldata.h>
  82 #include <sys/thread.h>
  83
  84 #include <sys/mbuf.h>
  85 #ifdef INET6
  86 #include <sys/domain.h>
  87 #endif /* INET6 */
  88 #include <sys/socket.h>
  89 #include <sys/socketvar.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 /*
 163  * TCP attaches to socket via pru_attach(), reserving space,
 164  * and an internet control block.  This is likely occuring on
 165  * cpu0 and may have to move later when we bind/connect.
 166  */
 167 static void
 168 tcp_usr_attach(netmsg_t msg)
 169 {
 170         struct socket *so = msg->base.nm_so;
 171         struct pru_attach_info *ai = msg->attach.nm_ai;
 172         int error;
 173         struct inpcb *inp;
 174         struct tcpcb *tp = 0;
 175         TCPDEBUG0;
 176
 177         soreference(so);
 178         inp = so->so_pcb;
 179         TCPDEBUG1();
 180         if (inp) {
 181                 error = EISCONN;
 182                 goto out;
 183         }
 184
 185         error = tcp_attach(so, ai);
 186         if (error)
 187                 goto out;
 188
 189         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 190                 so->so_linger = TCP_LINGERTIME;
 191         tp = sototcpcb(so);
 192 out:
 193         sofree(so);             /* from ref above */
 194         TCPDEBUG2(PRU_ATTACH);
 195         lwkt_replymsg(&msg->lmsg, error);
 196 }
 197
 198 /*
 199  * pru_detach() detaches the TCP protocol from the socket.
 200  * If the protocol state is non-embryonic, then can't
 201  * do this directly: have to initiate a pru_disconnect(),
 202  * which may finish later; embryonic TCB's can just
 203  * be discarded here.
 204  */
 205 static void
 206 tcp_usr_detach(netmsg_t msg)
 207 {
 208         struct socket *so = msg->base.nm_so;
 209         int error = 0;
 210         struct inpcb *inp;
 211         struct tcpcb *tp;
 212         TCPDEBUG0;
 213
 214         inp = so->so_pcb;
 215
 216         /*
 217          * If the inp is already detached it may have been due to an async
 218          * close.  Just return as if no error occured.
 219          *
 220          * It's possible for the tcpcb (tp) to disconnect from the inp due
 221          * to tcp_drop()->tcp_close() being called.  This may occur *after*
 222          * the detach message has been queued so we may find a NULL tp here.
 223          */
 224         if (inp) {
 225                 if ((tp = intotcpcb(inp)) != NULL) {
 226                         TCPDEBUG1();
 227                         tp = tcp_disconnect(tp);
 228                         TCPDEBUG2(PRU_DETACH);
 229                 }
 230         }
 231         lwkt_replymsg(&msg->lmsg, error);
 232 }
 233
 234 /*
 235  * NOTE: ignore_error is non-zero for certain disconnection races
 236  * which we want to silently allow, otherwise close() may return
 237  * an unexpected error.
 238  *
 239  * NOTE: The variables (msg) and (tp) are assumed.
 240  */
 241 #define COMMON_START(so, inp, ignore_error)                     \
 242         TCPDEBUG0;                                              \
 243                                                                 \
 244         inp = so->so_pcb;                                       \
 245         do {                                                    \
 246                  if (inp == NULL) {                             \
 247                         error = ignore_error ? 0 : EINVAL;      \
 248                         tp = NULL;                              \
 249                         goto out;                               \
 250                  }                                              \
 251                  tp = intotcpcb(inp);                           \
 252                  TCPDEBUG1();                                   \
 253         } while(0)
 254
 255 #define COMMON_END(req)                                         \
 256         out: do {                                               \
 257                 TCPDEBUG2(req);                                 \
 258                 lwkt_replymsg(&msg->lmsg, error);               \
 259                 return;                                         \
 260         } while(0)
 261
 262 /*
 263  * Give the socket an address.
 264  */
 265 static void
 266 tcp_usr_bind(netmsg_t msg)
 267 {
 268         struct socket *so = msg->bind.base.nm_so;
 269         struct sockaddr *nam = msg->bind.nm_nam;
 270         struct thread *td = msg->bind.nm_td;
 271         int error = 0;
 272         struct inpcb *inp;
 273         struct tcpcb *tp;
 274         struct sockaddr_in *sinp;
 275
 276         COMMON_START(so, inp, 0);
 277
 278         /*
 279          * Must check for multicast addresses and disallow binding
 280          * to them.
 281          */
 282         sinp = (struct sockaddr_in *)nam;
 283         if (sinp->sin_family == AF_INET &&
 284             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 285                 error = EAFNOSUPPORT;
 286                 goto out;
 287         }
 288         error = in_pcbbind(inp, nam, td);
 289         if (error)
 290                 goto out;
 291         COMMON_END(PRU_BIND);
 292
 293 }
 294
 295 #ifdef INET6
 296
 297 static void
 298 tcp6_usr_bind(netmsg_t msg)
 299 {
 300         struct socket *so = msg->bind.base.nm_so;
 301         struct sockaddr *nam = msg->bind.nm_nam;
 302         struct thread *td = msg->bind.nm_td;
 303         int error = 0;
 304         struct inpcb *inp;
 305         struct tcpcb *tp;
 306         struct sockaddr_in6 *sin6p;
 307
 308         COMMON_START(so, inp, 0);
 309
 310         /*
 311          * Must check for multicast addresses and disallow binding
 312          * to them.
 313          */
 314         sin6p = (struct sockaddr_in6 *)nam;
 315         if (sin6p->sin6_family == AF_INET6 &&
 316             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
 317                 error = EAFNOSUPPORT;
 318                 goto out;
 319         }
 320         inp->inp_vflag &= ~INP_IPV4;
 321         inp->inp_vflag |= INP_IPV6;
 322         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 323                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 324                         inp->inp_vflag |= INP_IPV4;
 325                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 326                         struct sockaddr_in sin;
 327
 328                         in6_sin6_2_sin(&sin, sin6p);
 329                         inp->inp_vflag |= INP_IPV4;
 330                         inp->inp_vflag &= ~INP_IPV6;
 331                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 332                         goto out;
 333                 }
 334         }
 335         error = in6_pcbbind(inp, nam, td);
 336         if (error)
 337                 goto out;
 338         COMMON_END(PRU_BIND);
 339 }
 340 #endif /* INET6 */
 341
 342 #ifdef SMP
 343
 344 struct netmsg_inswildcard {
 345         struct netmsg_base      base;
 346         struct inpcb            *nm_inp;
 347 };
 348
 349 static void
 350 in_pcbinswildcardhash_handler(netmsg_t msg)
 351 {
 352         struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
 353         int cpu = mycpuid, nextcpu;
 354
 355         in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
 356
 357         nextcpu = cpu + 1;
 358         if (nextcpu < ncpus2)
 359                 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg);
 360         else
 361                 lwkt_replymsg(&nm->base.lmsg, 0);
 362 }
 363
 364 #endif
 365
 366 /*
 367  * Prepare to accept connections.
 368  */
 369 static void
 370 tcp_usr_listen(netmsg_t msg)
 371 {
 372         struct socket *so = msg->listen.base.nm_so;
 373         struct thread *td = msg->listen.nm_td;
 374         int error = 0;
 375         struct inpcb *inp;
 376         struct tcpcb *tp;
 377 #ifdef SMP
 378         struct netmsg_inswildcard nm;
 379 #endif
 380
 381         COMMON_START(so, inp, 0);
 382         if (inp->inp_lport == 0) {
 383                 error = in_pcbbind(inp, NULL, td);
 384                 if (error)
 385                         goto out;
 386         }
 387
 388         tp->t_state = TCPS_LISTEN;
 389         tp->t_flags |= TF_SYNCACHE;
 390         tp->tt_msg = NULL; /* Catch any invalid timer usage */
 391
 392 #ifdef SMP
 393         if (ncpus > 1) {
 394                 /*
 395                  * We have to set the flag because we can't have other cpus
 396                  * messing with our inp's flags.
 397                  */
 398                 inp->inp_flags |= INP_WILDCARD_MP;
 399
 400                 KKASSERT(so->so_port == cpu_portfn(0));
 401                 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
 402                 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
 403
 404                 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
 405                             MSGF_PRIORITY, in_pcbinswildcardhash_handler);
 406                 nm.nm_inp = inp;
 407                 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
 408         }
 409 #endif
 410         in_pcbinswildcardhash(inp);
 411         COMMON_END(PRU_LISTEN);
 412 }
 413
 414 #ifdef INET6
 415
 416 static void
 417 tcp6_usr_listen(netmsg_t msg)
 418 {
 419         struct socket *so = msg->listen.base.nm_so;
 420         struct thread *td = msg->listen.nm_td;
 421         int error = 0;
 422         struct inpcb *inp;
 423         struct tcpcb *tp;
 424 #ifdef SMP
 425         struct netmsg_inswildcard nm;
 426 #endif
 427
 428         COMMON_START(so, inp, 0);
 429         if (inp->inp_lport == 0) {
 430                 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
 431                         inp->inp_vflag |= INP_IPV4;
 432                 else
 433                         inp->inp_vflag &= ~INP_IPV4;
 434                 error = in6_pcbbind(inp, NULL, td);
 435                 if (error)
 436                         goto out;
 437         }
 438
 439         tp->t_state = TCPS_LISTEN;
 440         tp->t_flags |= TF_SYNCACHE;
 441         tp->tt_msg = NULL; /* Catch any invalid timer usage */
 442
 443 #ifdef SMP
 444         if (ncpus > 1) {
 445                 /*
 446                  * We have to set the flag because we can't have other cpus
 447                  * messing with our inp's flags.
 448                  */
 449                 inp->inp_flags |= INP_WILDCARD_MP;
 450
 451                 KKASSERT(so->so_port == cpu_portfn(0));
 452                 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
 453                 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
 454
 455                 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
 456                             MSGF_PRIORITY, in_pcbinswildcardhash_handler);
 457                 nm.nm_inp = inp;
 458                 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
 459         }
 460 #endif
 461         in_pcbinswildcardhash(inp);
 462         COMMON_END(PRU_LISTEN);
 463 }
 464 #endif /* INET6 */
 465
 466 /*
 467  * Initiate connection to peer.
 468  * Create a template for use in transmissions on this connection.
 469  * Enter SYN_SENT state, and mark socket as connecting.
 470  * Start keep-alive timer, and seed output sequence space.
 471  * Send initial segment on connection.
 472  */
 473 static void
 474 tcp_usr_connect(netmsg_t msg)
 475 {
 476         struct socket *so = msg->connect.base.nm_so;
 477         struct sockaddr *nam = msg->connect.nm_nam;
 478         struct thread *td = msg->connect.nm_td;
 479         int error = 0;
 480         struct inpcb *inp;
 481         struct tcpcb *tp;
 482         struct sockaddr_in *sinp;
 483
 484         COMMON_START(so, inp, 0);
 485
 486         /*
 487          * Must disallow TCP ``connections'' to multicast addresses.
 488          */
 489         sinp = (struct sockaddr_in *)nam;
 490         if (sinp->sin_family == AF_INET
 491             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 492                 error = EAFNOSUPPORT;
 493                 goto out;
 494         }
 495
 496         if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
 497                 error = EAFNOSUPPORT; /* IPv6 only jail */
 498                 goto out;
 499         }
 500
 501         tcp_connect(msg);
 502         /* msg is invalid now */
 503         return;
 504 out:
 505         if (msg->connect.nm_m) {
 506                 m_freem(msg->connect.nm_m);
 507                 msg->connect.nm_m = NULL;
 508         }
 509         lwkt_replymsg(&msg->lmsg, error);
 510 }
 511
 512 #ifdef INET6
 513
 514 static void
 515 tcp6_usr_connect(netmsg_t msg)
 516 {
 517         struct socket *so = msg->connect.base.nm_so;
 518         struct sockaddr *nam = msg->connect.nm_nam;
 519         struct thread *td = msg->connect.nm_td;
 520         int error = 0;
 521         struct inpcb *inp;
 522         struct tcpcb *tp;
 523         struct sockaddr_in6 *sin6p;
 524
 525         COMMON_START(so, inp, 0);
 526
 527         /*
 528          * Must disallow TCP ``connections'' to multicast addresses.
 529          */
 530         sin6p = (struct sockaddr_in6 *)nam;
 531         if (sin6p->sin6_family == AF_INET6
 532             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
 533                 error = EAFNOSUPPORT;
 534                 goto out;
 535         }
 536
 537         if (!prison_remote_ip(td, nam)) {
 538                 error = EAFNOSUPPORT; /* IPv4 only jail */
 539                 goto out;
 540         }
 541
 542         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 543                 struct sockaddr_in *sinp;
 544
 545                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 546                         error = EINVAL;
 547                         goto out;
 548                 }
 549                 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
 550                 in6_sin6_2_sin(sinp, sin6p);
 551                 inp->inp_vflag |= INP_IPV4;
 552                 inp->inp_vflag &= ~INP_IPV6;
 553                 msg->connect.nm_nam = (struct sockaddr *)sinp;
 554                 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC;
 555                 tcp_connect(msg);
 556                 /* msg is invalid now */
 557                 return;
 558         }
 559         inp->inp_vflag &= ~INP_IPV4;
 560         inp->inp_vflag |= INP_IPV6;
 561         inp->inp_inc.inc_isipv6 = 1;
 562
 563         msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
 564         tcp6_connect(msg);
 565         /* msg is invalid now */
 566         return;
 567 out:
 568         if (msg->connect.nm_m) {
 569                 m_freem(msg->connect.nm_m);
 570                 msg->connect.nm_m = NULL;
 571         }
 572         lwkt_replymsg(&msg->lmsg, error);
 573 }
 574
 575 #endif /* INET6 */
 576
 577 /*
 578  * Initiate disconnect from peer.
 579  * If connection never passed embryonic stage, just drop;
 580  * else if don't need to let data drain, then can just drop anyways,
 581  * else have to begin TCP shutdown process: mark socket disconnecting,
 582  * drain unread data, state switch to reflect user close, and
 583  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 584  * when peer sends FIN and acks ours.
 585  *
 586  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 587  */
 588 static void
 589 tcp_usr_disconnect(netmsg_t msg)
 590 {
 591         struct socket *so = msg->disconnect.base.nm_so;
 592         int error = 0;
 593         struct inpcb *inp;
 594         struct tcpcb *tp;
 595
 596         COMMON_START(so, inp, 1);
 597         tp = tcp_disconnect(tp);
 598         COMMON_END(PRU_DISCONNECT);
 599 }
 600
 601 /*
 602  * Accept a connection.  Essentially all the work is
 603  * done at higher levels; just return the address
 604  * of the peer, storing through addr.
 605  */
 606 static void
 607 tcp_usr_accept(netmsg_t msg)
 608 {
 609         struct socket *so = msg->accept.base.nm_so;
 610         struct sockaddr **nam = msg->accept.nm_nam;
 611         int error = 0;
 612         struct inpcb *inp;
 613         struct tcpcb *tp = NULL;
 614         TCPDEBUG0;
 615
 616         inp = so->so_pcb;
 617         if (so->so_state & SS_ISDISCONNECTED) {
 618                 error = ECONNABORTED;
 619                 goto out;
 620         }
 621         if (inp == 0) {
 622                 error = EINVAL;
 623                 goto out;
 624         }
 625
 626         tp = intotcpcb(inp);
 627         TCPDEBUG1();
 628         in_setpeeraddr(so, nam);
 629         COMMON_END(PRU_ACCEPT);
 630 }
 631
 632 #ifdef INET6
 633 static void
 634 tcp6_usr_accept(netmsg_t msg)
 635 {
 636         struct socket *so = msg->accept.base.nm_so;
 637         struct sockaddr **nam = msg->accept.nm_nam;
 638         int error = 0;
 639         struct inpcb *inp;
 640         struct tcpcb *tp = NULL;
 641         TCPDEBUG0;
 642
 643         inp = so->so_pcb;
 644
 645         if (so->so_state & SS_ISDISCONNECTED) {
 646                 error = ECONNABORTED;
 647                 goto out;
 648         }
 649         if (inp == 0) {
 650                 error = EINVAL;
 651                 goto out;
 652         }
 653         tp = intotcpcb(inp);
 654         TCPDEBUG1();
 655         in6_mapped_peeraddr(so, nam);
 656         COMMON_END(PRU_ACCEPT);
 657 }
 658 #endif /* INET6 */
 659 /*
 660  * Mark the connection as being incapable of further output.
 661  */
 662 static void
 663 tcp_usr_shutdown(netmsg_t msg)
 664 {
 665         struct socket *so = msg->shutdown.base.nm_so;
 666         int error = 0;
 667         struct inpcb *inp;
 668         struct tcpcb *tp;
 669
 670         COMMON_START(so, inp, 0);
 671         socantsendmore(so);
 672         tp = tcp_usrclosed(tp);
 673         if (tp)
 674                 error = tcp_output(tp);
 675         COMMON_END(PRU_SHUTDOWN);
 676 }
 677
 678 /*
 679  * After a receive, possibly send window update to peer.
 680  */
 681 static void
 682 tcp_usr_rcvd(netmsg_t msg)
 683 {
 684         struct socket *so = msg->rcvd.base.nm_so;
 685         int error = 0;
 686         struct inpcb *inp;
 687         struct tcpcb *tp;
 688
 689         COMMON_START(so, inp, 0);
 690         tcp_output(tp);
 691         COMMON_END(PRU_RCVD);
 692 }
 693
 694 /*
 695  * Do a send by putting data in output queue and updating urgent
 696  * marker if URG set.  Possibly send more data.  Unlike the other
 697  * pru_*() routines, the mbuf chains are our responsibility.  We
 698  * must either enqueue them or free them.  The other pru_* routines
 699  * generally are caller-frees.
 700  */
 701 static void
 702 tcp_usr_send(netmsg_t msg)
 703 {
 704         struct socket *so = msg->send.base.nm_so;
 705         int flags = msg->send.nm_flags;
 706         struct mbuf *m = msg->send.nm_m;
 707         struct sockaddr *nam = msg->send.nm_addr;
 708         struct mbuf *control = msg->send.nm_control;
 709         struct thread *td = msg->send.nm_td;
 710         int error = 0;
 711         struct inpcb *inp;
 712         struct tcpcb *tp;
 713 #ifdef INET6
 714         int isipv6;
 715 #endif
 716         TCPDEBUG0;
 717
 718         inp = so->so_pcb;
 719
 720         if (inp == NULL) {
 721                 /*
 722                  * OOPS! we lost a race, the TCP session got reset after
 723                  * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
 724                  * network interrupt in the non-critical section of sosend().
 725                  */
 726                 m_freem(m);
 727                 if (control)
 728                         m_freem(control);
 729                 error = ECONNRESET;     /* XXX EPIPE? */
 730                 tp = NULL;
 731                 TCPDEBUG1();
 732                 goto out;
 733         }
 734 #ifdef INET6
 735         isipv6 = nam && nam->sa_family == AF_INET6;
 736 #endif /* INET6 */
 737         tp = intotcpcb(inp);
 738         TCPDEBUG1();
 739         if (control) {
 740                 /* TCP doesn't do control messages (rights, creds, etc) */
 741                 if (control->m_len) {
 742                         m_freem(control);
 743                         m_freem(m);
 744                         error = EINVAL;
 745                         goto out;
 746                 }
 747                 m_freem(control);       /* empty control, just free it */
 748         }
 749
 750         /*
 751          * Don't let too much OOB data build up
 752          */
 753         if (flags & PRUS_OOB) {
 754                 if (ssb_space(&so->so_snd) < -512) {
 755                         m_freem(m);
 756                         error = ENOBUFS;
 757                         goto out;
 758                 }
 759         }
 760
 761         /*
 762          * Do implied connect if not yet connected.  Any data sent
 763          * with the connect is handled by tcp_connect() and friends.
 764          *
 765          * NOTE!  PROTOCOL THREAD MAY BE CHANGED BY THE CONNECT!
 766          */
 767         if (nam && tp->t_state < TCPS_SYN_SENT) {
 768                 kprintf("implied fallback\n");
 769                 msg->connect.nm_nam = nam;
 770                 msg->connect.nm_td = td;
 771                 msg->connect.nm_m = m;
 772                 msg->connect.nm_flags = flags;
 773                 msg->connect.nm_reconnect = NMSG_RECONNECT_FALLBACK;
 774 #ifdef INET6
 775                 if (isipv6)
 776                         tcp6_connect(msg);
 777                 else
 778 #endif /* INET6 */
 779                         tcp_connect(msg);
 780                 /* msg invalid now */
 781                 return;
 782         }
 783
 784         /*
 785          * Pump the data into the socket.
 786          */
 787         if (m)
 788                 ssb_appendstream(&so->so_snd, m);
 789         if (flags & PRUS_OOB) {
 790                 /*
 791                  * According to RFC961 (Assigned Protocols),
 792                  * the urgent pointer points to the last octet
 793                  * of urgent data.  We continue, however,
 794                  * to consider it to indicate the first octet
 795                  * of data past the urgent section.
 796                  * Otherwise, snd_up should be one lower.
 797                  */
 798                 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
 799                 tp->t_flags |= TF_FORCE;
 800                 error = tcp_output(tp);
 801                 tp->t_flags &= ~TF_FORCE;
 802         } else {
 803                 if (flags & PRUS_EOF) {
 804                         /*
 805                          * Close the send side of the connection after
 806                          * the data is sent.
 807                          */
 808                         socantsendmore(so);
 809                         tp = tcp_usrclosed(tp);
 810                 }
 811                 if (tp != NULL) {
 812                         if (flags & PRUS_MORETOCOME)
 813                                 tp->t_flags |= TF_MORETOCOME;
 814                         error = tcp_output(tp);
 815                         if (flags & PRUS_MORETOCOME)
 816                                 tp->t_flags &= ~TF_MORETOCOME;
 817                 }
 818         }
 819         COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
 820                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 821 }
 822
 823 /*
 824  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 825  *       will sofree() it when we return.
 826  */
 827 static void
 828 tcp_usr_abort(netmsg_t msg)
 829 {
 830         struct socket *so = msg->abort.base.nm_so;
 831         int error = 0;
 832         struct inpcb *inp;
 833         struct tcpcb *tp;
 834
 835         COMMON_START(so, inp, 1);
 836         tp = tcp_drop(tp, ECONNABORTED);
 837         COMMON_END(PRU_ABORT);
 838 }
 839
 840 /*
 841  * Receive out-of-band data.
 842  */
 843 static void
 844 tcp_usr_rcvoob(netmsg_t msg)
 845 {
 846         struct socket *so = msg->rcvoob.base.nm_so;
 847         struct mbuf *m = msg->rcvoob.nm_m;
 848         int flags = msg->rcvoob.nm_flags;
 849         int error = 0;
 850         struct inpcb *inp;
 851         struct tcpcb *tp;
 852
 853         COMMON_START(so, inp, 0);
 854         if ((so->so_oobmark == 0 &&
 855              (so->so_state & SS_RCVATMARK) == 0) ||
 856             so->so_options & SO_OOBINLINE ||
 857             tp->t_oobflags & TCPOOB_HADDATA) {
 858                 error = EINVAL;
 859                 goto out;
 860         }
 861         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
 862                 error = EWOULDBLOCK;
 863                 goto out;
 864         }
 865         m->m_len = 1;
 866         *mtod(m, caddr_t) = tp->t_iobc;
 867         if ((flags & MSG_PEEK) == 0)
 868                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
 869         COMMON_END(PRU_RCVOOB);
 870 }
 871
 872 /* xxx - should be const */
 873 struct pr_usrreqs tcp_usrreqs = {
 874         .pru_abort = tcp_usr_abort,
 875         .pru_accept = tcp_usr_accept,
 876         .pru_attach = tcp_usr_attach,
 877         .pru_bind = tcp_usr_bind,
 878         .pru_connect = tcp_usr_connect,
 879         .pru_connect2 = pr_generic_notsupp,
 880         .pru_control = in_control_dispatch,
 881         .pru_detach = tcp_usr_detach,
 882         .pru_disconnect = tcp_usr_disconnect,
 883         .pru_listen = tcp_usr_listen,
 884         .pru_peeraddr = in_setpeeraddr_dispatch,
 885         .pru_rcvd = tcp_usr_rcvd,
 886         .pru_rcvoob = tcp_usr_rcvoob,
 887         .pru_send = tcp_usr_send,
 888         .pru_sense = pru_sense_null,
 889         .pru_shutdown = tcp_usr_shutdown,
 890         .pru_sockaddr = in_setsockaddr_dispatch,
 891         .pru_sosend = sosend,
 892         .pru_soreceive = soreceive
 893 };
 894
 895 #ifdef INET6
 896 struct pr_usrreqs tcp6_usrreqs = {
 897         .pru_abort = tcp_usr_abort,
 898         .pru_accept = tcp6_usr_accept,
 899         .pru_attach = tcp_usr_attach,
 900         .pru_bind = tcp6_usr_bind,
 901         .pru_connect = tcp6_usr_connect,
 902         .pru_connect2 = pr_generic_notsupp,
 903         .pru_control = in6_control_dispatch,
 904         .pru_detach = tcp_usr_detach,
 905         .pru_disconnect = tcp_usr_disconnect,
 906         .pru_listen = tcp6_usr_listen,
 907         .pru_peeraddr = in6_mapped_peeraddr_dispatch,
 908         .pru_rcvd = tcp_usr_rcvd,
 909         .pru_rcvoob = tcp_usr_rcvoob,
 910         .pru_send = tcp_usr_send,
 911         .pru_sense = pru_sense_null,
 912         .pru_shutdown = tcp_usr_shutdown,
 913         .pru_sockaddr = in6_mapped_sockaddr_dispatch,
 914         .pru_sosend = sosend,
 915         .pru_soreceive = soreceive
 916 };
 917 #endif /* INET6 */
 918
 919 static int
 920 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
 921                   struct sockaddr_in *sin, struct sockaddr_in *if_sin)
 922 {
 923         struct inpcb *inp = tp->t_inpcb, *oinp;
 924         struct socket *so = inp->inp_socket;
 925         struct route *ro = &inp->inp_route;
 926
 927         oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
 928                                  sin->sin_addr, sin->sin_port,
 929                                  (inp->inp_laddr.s_addr != INADDR_ANY ?
 930                                   inp->inp_laddr : if_sin->sin_addr),
 931                                 inp->inp_lport, 0, NULL);
 932         if (oinp != NULL) {
 933                 m_freem(m);
 934                 return (EADDRINUSE);
 935         }
 936         if (inp->inp_laddr.s_addr == INADDR_ANY)
 937                 inp->inp_laddr = if_sin->sin_addr;
 938         inp->inp_faddr = sin->sin_addr;
 939         inp->inp_fport = sin->sin_port;
 940         inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
 941         in_pcbinsconnhash(inp);
 942
 943         /*
 944          * We are now on the inpcb's owner CPU, if the cached route was
 945          * freed because the rtentry's owner CPU is not the current CPU
 946          * (e.g. in tcp_connect()), then we try to reallocate it here with
 947          * the hope that a rtentry may be cloned from a RTF_PRCLONING
 948          * rtentry.
 949          */
 950         if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 951             ro->ro_rt == NULL) {
 952                 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 953                 ro->ro_dst.sa_family = AF_INET;
 954                 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 955                 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
 956                         sin->sin_addr;
 957                 rtalloc(ro);
 958         }
 959
 960         /*
 961          * Now that no more errors can occur, change the protocol processing
 962          * port to the current thread (which is the correct thread).
 963          *
 964          * Create TCP timer message now; we are on the tcpcb's owner
 965          * CPU/thread.
 966          */
 967         tcp_create_timermsg(tp, &curthread->td_msgport);
 968
 969         /*
 970          * Compute window scaling to request.  Use a larger scaling then
 971          * needed for the initial receive buffer in case the receive buffer
 972          * gets expanded.
 973          */
 974         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
 975                 tp->request_r_scale = TCP_MIN_WINSHIFT;
 976         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
 977                (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
 978         ) {
 979                 tp->request_r_scale++;
 980         }
 981
 982         soisconnecting(so);
 983         tcpstat.tcps_connattempt++;
 984         tp->t_state = TCPS_SYN_SENT;
 985         tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep);
 986         tp->iss = tcp_new_isn(tp);
 987         tcp_sendseqinit(tp);
 988         if (m) {
 989                 ssb_appendstream(&so->so_snd, m);
 990                 m = NULL;
 991                 if (flags & PRUS_OOB)
 992                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
 993         }
 994
 995         /*
 996          * Close the send side of the connection after
 997          * the data is sent if flagged.
 998          */
 999         if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1000                 socantsendmore(so);
1001                 tp = tcp_usrclosed(tp);
1002         }
1003         return (tcp_output(tp));
1004 }
1005
1006 /*
1007  * Common subroutine to open a TCP connection to remote host specified
1008  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1009  * port number if needed.  Call in_pcbladdr to do the routing and to choose
1010  * a local host address (interface).
1011  * Initialize connection parameters and enter SYN-SENT state.
1012  */
1013 static void
1014 tcp_connect(netmsg_t msg)
1015 {
1016         struct socket *so = msg->connect.base.nm_so;
1017         struct sockaddr *nam = msg->connect.nm_nam;
1018         struct thread *td = msg->connect.nm_td;
1019         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1020         struct sockaddr_in *if_sin;
1021         struct inpcb *inp;
1022         struct tcpcb *tp;
1023         int error;
1024 #ifdef SMP
1025         lwkt_port_t port;
1026 #endif
1027
1028         COMMON_START(so, inp, 0);
1029
1030         /*
1031          * Reconnect our pcb if we have to
1032          */
1033         if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1034                 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1035                 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1036         }
1037
1038         /*
1039          * Bind if we have to
1040          */
1041         if (inp->inp_lport == 0) {
1042                 error = in_pcbbind(inp, NULL, td);
1043                 if (error)
1044                         goto out;
1045         }
1046         so = inp->inp_socket;
1047         KKASSERT(so);
1048
1049         /*
1050          * Calculate the correct protocol processing thread.  The connect
1051          * operation must run there.  Set the forwarding port before we
1052          * forward the message or it will get bounced right back to us.
1053          */
1054         error = in_pcbladdr(inp, nam, &if_sin, td);
1055         if (error)
1056                 goto out;
1057
1058 #ifdef SMP
1059         port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1060                             (inp->inp_laddr.s_addr ?
1061                              inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1062                             inp->inp_lport);
1063
1064         if (port != &curthread->td_msgport) {
1065                 struct route *ro = &inp->inp_route;
1066
1067                 /*
1068                  * in_pcbladdr() may have allocated a route entry for us
1069                  * on the current CPU, but we need a route entry on the
1070                  * inpcb's owner CPU, so free it here.
1071                  */
1072                 if (ro->ro_rt != NULL)
1073                         RTFREE(ro->ro_rt);
1074                 bzero(ro, sizeof(*ro));
1075
1076                 /*
1077                  * We are moving the protocol processing port the socket
1078                  * is on, we have to unlink here and re-link on the
1079                  * target cpu.
1080                  */
1081                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1082                 sosetport(so, port);
1083                 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1084                 msg->connect.base.nm_dispatch = tcp_connect;
1085
1086                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1087                 /* msg invalid now */
1088                 return;
1089         }
1090 #else
1091         KKASSERT(so->so_port == &curthread->td_msgport);
1092 #endif
1093         error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1094                                   msg->connect.nm_m, sin, if_sin);
1095         msg->connect.nm_m = NULL;
1096 out:
1097         if (msg->connect.nm_m) {
1098                 m_freem(msg->connect.nm_m);
1099                 msg->connect.nm_m = NULL;
1100         }
1101         if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1102                 kfree(msg->connect.nm_nam, M_LWKTMSG);
1103                 msg->connect.nm_nam = NULL;
1104         }
1105         lwkt_replymsg(&msg->connect.base.lmsg, error);
1106         /* msg invalid now */
1107 }
1108
1109 #ifdef INET6
1110
1111 static void
1112 tcp6_connect(netmsg_t msg)
1113 {
1114         struct tcpcb *tp;
1115         struct socket *so = msg->connect.base.nm_so;
1116         struct sockaddr *nam = msg->connect.nm_nam;
1117         struct thread *td = msg->connect.nm_td;
1118         struct inpcb *inp;
1119         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1120         struct in6_addr *addr6;
1121 #ifdef SMP
1122         lwkt_port_t port;
1123 #endif
1124         int error;
1125
1126         COMMON_START(so, inp, 0);
1127
1128         /*
1129          * Reconnect our pcb if we have to
1130          */
1131         if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1132                 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1133                 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1134         }
1135
1136         /*
1137          * Bind if we have to
1138          */
1139         if (inp->inp_lport == 0) {
1140                 error = in6_pcbbind(inp, NULL, td);
1141                 if (error)
1142                         goto out;
1143         }
1144
1145         /*
1146          * Cannot simply call in_pcbconnect, because there might be an
1147          * earlier incarnation of this same connection still in
1148          * TIME_WAIT state, creating an ADDRINUSE error.
1149          */
1150         error = in6_pcbladdr(inp, nam, &addr6, td);
1151         if (error)
1152                 goto out;
1153
1154 #ifdef SMP
1155         port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1156
1157         if (port != &curthread->td_msgport) {
1158                 struct route *ro = &inp->inp_route;
1159
1160                 /*
1161                  * in_pcbladdr() may have allocated a route entry for us
1162                  * on the current CPU, but we need a route entry on the
1163                  * inpcb's owner CPU, so free it here.
1164                  */
1165                 if (ro->ro_rt != NULL)
1166                         RTFREE(ro->ro_rt);
1167                 bzero(ro, sizeof(*ro));
1168
1169                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1170                 sosetport(so, port);
1171                 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1172                 msg->connect.base.nm_dispatch = tcp6_connect;
1173
1174                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1175                 /* msg invalid now */
1176                 return;
1177         }
1178 #endif
1179         error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1180                                    &msg->connect.nm_m, sin6, addr6);
1181         /* nm_m may still be intact */
1182 out:
1183         if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
1184                 tcp_connect(msg);
1185                 /* msg invalid now */
1186         } else {
1187                 if (msg->connect.nm_m) {
1188                         m_freem(msg->connect.nm_m);
1189                         msg->connect.nm_m = NULL;
1190                 }
1191                 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1192                         kfree(msg->connect.nm_nam, M_LWKTMSG);
1193                         msg->connect.nm_nam = NULL;
1194                 }
1195                 lwkt_replymsg(&msg->connect.base.lmsg, error);
1196                 /* msg invalid now */
1197         }
1198 }
1199
1200 static int
1201 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1202                    struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1203 {
1204         struct mbuf *m = *mp;
1205         struct inpcb *inp = tp->t_inpcb;
1206         struct socket *so = inp->inp_socket;
1207         struct inpcb *oinp;
1208
1209         /*
1210          * Cannot simply call in_pcbconnect, because there might be an
1211          * earlier incarnation of this same connection still in
1212          * TIME_WAIT state, creating an ADDRINUSE error.
1213          */
1214         oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
1215                                   &sin6->sin6_addr, sin6->sin6_port,
1216                                   (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1217                                       addr6 : &inp->in6p_laddr),
1218                                   inp->inp_lport,  0, NULL);
1219         if (oinp)
1220                 return (EADDRINUSE);
1221
1222         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1223                 inp->in6p_laddr = *addr6;
1224         inp->in6p_faddr = sin6->sin6_addr;
1225         inp->inp_fport = sin6->sin6_port;
1226         if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1227                 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1228         in_pcbinsconnhash(inp);
1229
1230         /*
1231          * Now that no more errors can occur, change the protocol processing
1232          * port to the current thread (which is the correct thread).
1233          *
1234          * Create TCP timer message now; we are on the tcpcb's owner
1235          * CPU/thread.
1236          */
1237         tcp_create_timermsg(tp, &curthread->td_msgport);
1238
1239         /* Compute window scaling to request.  */
1240         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1241                 tp->request_r_scale = TCP_MIN_WINSHIFT;
1242         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1243             (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1244                 tp->request_r_scale++;
1245         }
1246
1247         soisconnecting(so);
1248         tcpstat.tcps_connattempt++;
1249         tp->t_state = TCPS_SYN_SENT;
1250         tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep);
1251         tp->iss = tcp_new_isn(tp);
1252         tcp_sendseqinit(tp);
1253         if (m) {
1254                 ssb_appendstream(&so->so_snd, m);
1255                 *mp = NULL;
1256                 if (flags & PRUS_OOB)
1257                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1258         }
1259
1260         /*
1261          * Close the send side of the connection after
1262          * the data is sent if flagged.
1263          */
1264         if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1265                 socantsendmore(so);
1266                 tp = tcp_usrclosed(tp);
1267         }
1268         return (tcp_output(tp));
1269 }
1270
1271 #endif /* INET6 */
1272
1273 /*
1274  * The new sockopt interface makes it possible for us to block in the
1275  * copyin/out step (if we take a page fault).  Taking a page fault while
1276  * in a critical section is probably a Bad Thing.  (Since sockets and pcbs
1277  * both now use TSM, there probably isn't any need for this function to
1278  * run in a critical section any more.  This needs more examination.)
1279  */
1280 void
1281 tcp_ctloutput(netmsg_t msg)
1282 {
1283         struct socket *so = msg->base.nm_so;
1284         struct sockopt *sopt = msg->ctloutput.nm_sopt;
1285         int     error, opt, optval;
1286         struct  inpcb *inp;
1287         struct  tcpcb *tp;
1288
1289         error = 0;
1290         inp = so->so_pcb;
1291         if (inp == NULL) {
1292                 error = ECONNRESET;
1293                 goto done;
1294         }
1295
1296         if (sopt->sopt_level != IPPROTO_TCP) {
1297 #ifdef INET6
1298                 if (INP_CHECK_SOCKAF(so, AF_INET6))
1299                         ip6_ctloutput_dispatch(msg);
1300                 else
1301 #endif /* INET6 */
1302                 ip_ctloutput(msg);
1303                 /* msg invalid now */
1304                 return;
1305         }
1306         tp = intotcpcb(inp);
1307
1308         switch (sopt->sopt_dir) {
1309         case SOPT_SET:
1310                 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1311                                       sizeof optval);
1312                 if (error)
1313                         break;
1314                 switch (sopt->sopt_name) {
1315                 case TCP_FASTKEEP:
1316                         if (optval > 0) {
1317                                 if ((tp->t_flags & TF_FASTKEEP) == 0) {
1318                                         tp->t_flags |= TF_FASTKEEP;
1319                                         tcp_timer_keep_activity(tp, 0);
1320                                 }
1321                         } else {
1322                                 tp->t_flags &= ~TF_FASTKEEP;
1323                         }
1324                         break;
1325 #ifdef TCP_SIGNATURE
1326                 case TCP_SIGNATURE_ENABLE:
1327                         if (optval > 0)
1328                                 tp->t_flags |= TF_SIGNATURE;
1329                         else
1330                                 tp->t_flags &= ~TF_SIGNATURE;
1331                         break;
1332 #endif /* TCP_SIGNATURE */
1333                 case TCP_NODELAY:
1334                 case TCP_NOOPT:
1335                         switch (sopt->sopt_name) {
1336                         case TCP_NODELAY:
1337                                 opt = TF_NODELAY;
1338                                 break;
1339                         case TCP_NOOPT:
1340                                 opt = TF_NOOPT;
1341                                 break;
1342                         default:
1343                                 opt = 0; /* dead code to fool gcc */
1344                                 break;
1345                         }
1346
1347                         if (optval)
1348                                 tp->t_flags |= opt;
1349                         else
1350                                 tp->t_flags &= ~opt;
1351                         break;
1352
1353                 case TCP_NOPUSH:
1354                         if (optval)
1355                                 tp->t_flags |= TF_NOPUSH;
1356                         else {
1357                                 tp->t_flags &= ~TF_NOPUSH;
1358                                 error = tcp_output(tp);
1359                         }
1360                         break;
1361
1362                 case TCP_MAXSEG:
1363                         /*
1364                          * Must be between 0 and maxseg.  If the requested
1365                          * maxseg is too small to satisfy the desired minmss,
1366                          * pump it up (silently so sysctl modifications of
1367                          * minmss do not create unexpected program failures).
1368                          * Handle degenerate cases.
1369                          */
1370                         if (optval > 0 && optval <= tp->t_maxseg) {
1371                                 if (optval + 40 < tcp_minmss) {
1372                                         optval = tcp_minmss - 40;
1373                                         if (optval < 0)
1374                                                 optval = 1;
1375                                 }
1376                                 tp->t_maxseg = optval;
1377                         } else {
1378                                 error = EINVAL;
1379                         }
1380                         break;
1381
1382                 default:
1383                         error = ENOPROTOOPT;
1384                         break;
1385                 }
1386                 break;
1387
1388         case SOPT_GET:
1389                 switch (sopt->sopt_name) {
1390 #ifdef TCP_SIGNATURE
1391                 case TCP_SIGNATURE_ENABLE:
1392                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1393                         break;
1394 #endif /* TCP_SIGNATURE */
1395                 case TCP_NODELAY:
1396                         optval = tp->t_flags & TF_NODELAY;
1397                         break;
1398                 case TCP_MAXSEG:
1399                         optval = tp->t_maxseg;
1400                         break;
1401                 case TCP_NOOPT:
1402                         optval = tp->t_flags & TF_NOOPT;
1403                         break;
1404                 case TCP_NOPUSH:
1405                         optval = tp->t_flags & TF_NOPUSH;
1406                         break;
1407                 default:
1408                         error = ENOPROTOOPT;
1409                         break;
1410                 }
1411                 if (error == 0)
1412                         soopt_from_kbuf(sopt, &optval, sizeof optval);
1413                 break;
1414         }
1415 done:
1416         lwkt_replymsg(&msg->lmsg, error);
1417 }
1418
1419 /*
1420  * tcp_sendspace and tcp_recvspace are the default send and receive window
1421  * sizes, respectively.  These are obsolescent (this information should
1422  * be set by the route).
1423  *
1424  * Use a default that does not require tcp window scaling to be turned
1425  * on.  Individual programs or the administrator can increase the default.
1426  */
1427 u_long  tcp_sendspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1428 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1429     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1430 u_long  tcp_recvspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1431 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1432     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1433
1434 /*
1435  * Attach TCP protocol to socket, allocating internet protocol control
1436  * block, tcp control block, bufer space, and entering LISTEN state
1437  * if to accept connections.
1438  */
1439 static int
1440 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1441 {
1442         struct tcpcb *tp;
1443         struct inpcb *inp;
1444         int error;
1445         int cpu;
1446 #ifdef INET6
1447         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1448 #endif
1449
1450         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
1451                 lwkt_gettoken(&so->so_rcv.ssb_token);
1452                 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1453                                   ai->sb_rlimit);
1454                 lwkt_reltoken(&so->so_rcv.ssb_token);
1455                 if (error)
1456                         return (error);
1457         }
1458         atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1459         atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
1460         cpu = mycpu->gd_cpuid;
1461
1462         /*
1463          * Set the default port for protocol processing. This will likely
1464          * change when we connect.
1465          */
1466         error = in_pcballoc(so, &tcbinfo[cpu]);
1467         if (error)
1468                 return (error);
1469         inp = so->so_pcb;
1470 #ifdef INET6
1471         if (isipv6) {
1472                 inp->inp_vflag |= INP_IPV6;
1473                 inp->in6p_hops = -1;    /* use kernel default */
1474         }
1475         else
1476 #endif
1477         inp->inp_vflag |= INP_IPV4;
1478         tp = tcp_newtcpcb(inp);
1479         if (tp == NULL) {
1480                 /*
1481                  * Make sure the socket is destroyed by the pcbdetach.
1482                  */
1483                 soreference(so);
1484 #ifdef INET6
1485                 if (isipv6)
1486                         in6_pcbdetach(inp);
1487                 else
1488 #endif
1489                 in_pcbdetach(inp);
1490                 sofree(so);     /* from ref above */
1491                 return (ENOBUFS);
1492         }
1493         tp->t_state = TCPS_CLOSED;
1494         return (0);
1495 }
1496
1497 /*
1498  * Initiate (or continue) disconnect.
1499  * If embryonic state, just send reset (once).
1500  * If in ``let data drain'' option and linger null, just drop.
1501  * Otherwise (hard), mark socket disconnecting and drop
1502  * current input data; switch states based on user close, and
1503  * send segment to peer (with FIN).
1504  */
1505 static struct tcpcb *
1506 tcp_disconnect(struct tcpcb *tp)
1507 {
1508         struct socket *so = tp->t_inpcb->inp_socket;
1509
1510         if (tp->t_state < TCPS_ESTABLISHED) {
1511                 tp = tcp_close(tp);
1512         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1513                 tp = tcp_drop(tp, 0);
1514         } else {
1515                 lwkt_gettoken(&so->so_rcv.ssb_token);
1516                 soisdisconnecting(so);
1517                 sbflush(&so->so_rcv.sb);
1518                 tp = tcp_usrclosed(tp);
1519                 if (tp)
1520                         tcp_output(tp);
1521                 lwkt_reltoken(&so->so_rcv.ssb_token);
1522         }
1523         return (tp);
1524 }
1525
1526 /*
1527  * User issued close, and wish to trail through shutdown states:
1528  * if never received SYN, just forget it.  If got a SYN from peer,
1529  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1530  * If already got a FIN from peer, then almost done; go to LAST_ACK
1531  * state.  In all other cases, have already sent FIN to peer (e.g.
1532  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1533  * for peer to send FIN or not respond to keep-alives, etc.
1534  * We can let the user exit from the close as soon as the FIN is acked.
1535  */
1536 static struct tcpcb *
1537 tcp_usrclosed(struct tcpcb *tp)
1538 {
1539
1540         switch (tp->t_state) {
1541
1542         case TCPS_CLOSED:
1543         case TCPS_LISTEN:
1544                 tp->t_state = TCPS_CLOSED;
1545                 tp = tcp_close(tp);
1546                 break;
1547
1548         case TCPS_SYN_SENT:
1549         case TCPS_SYN_RECEIVED:
1550                 tp->t_flags |= TF_NEEDFIN;
1551                 break;
1552
1553         case TCPS_ESTABLISHED:
1554                 tp->t_state = TCPS_FIN_WAIT_1;
1555                 break;
1556
1557         case TCPS_CLOSE_WAIT:
1558                 tp->t_state = TCPS_LAST_ACK;
1559                 break;
1560         }
1561         if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1562                 soisdisconnected(tp->t_inpcb->inp_socket);
1563                 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1564                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1565                         tcp_callout_reset(tp, tp->tt_2msl, tcp_maxidle,
1566                             tcp_timer_2msl);
1567                 }
1568         }
1569         return (tp);
1570 }