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