sys/netinet/tcp_usrreq.c

   1 /*
   2  * Copyright (c) 2003, 2004 Jeffrey M. Hsu.  All rights reserved.
   3  * Copyright (c) 2003, 2004 The DragonFly Project.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to The DragonFly Project
   6  * by Jeffrey M. Hsu.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of The DragonFly Project nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific, prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1988, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      From: @(#)tcp_usrreq.c  8.2 (Berkeley) 1/3/94
  63  * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
  64  */
  65
  66 #include "opt_ipsec.h"
  67 #include "opt_inet.h"
  68 #include "opt_inet6.h"
  69 #include "opt_tcpdebug.h"
  70
  71 #include <sys/param.h>
  72 #include <sys/systm.h>
  73 #include <sys/kernel.h>
  74 #include <sys/malloc.h>
  75 #include <sys/sysctl.h>
  76 #include <sys/globaldata.h>
  77 #include <sys/thread.h>
  78
  79 #include <sys/mbuf.h>
  80 #ifdef INET6
  81 #include <sys/domain.h>
  82 #endif /* INET6 */
  83 #include <sys/socket.h>
  84 #include <sys/socketvar.h>
  85 #include <sys/socketops.h>
  86 #include <sys/protosw.h>
  87
  88 #include <sys/thread2.h>
  89 #include <sys/msgport2.h>
  90 #include <sys/socketvar2.h>
  91
  92 #include <net/if.h>
  93 #include <net/netisr.h>
  94 #include <net/route.h>
  95
  96 #include <net/netmsg2.h>
  97 #include <net/netisr2.h>
  98
  99 #include <netinet/in.h>
 100 #include <netinet/in_systm.h>
 101 #ifdef INET6
 102 #include <netinet/ip6.h>
 103 #endif
 104 #include <netinet/in_pcb.h>
 105 #ifdef INET6
 106 #include <netinet6/in6_pcb.h>
 107 #endif
 108 #include <netinet/in_var.h>
 109 #include <netinet/ip_var.h>
 110 #ifdef INET6
 111 #include <netinet6/ip6_var.h>
 112 #include <netinet6/tcp6_var.h>
 113 #endif
 114 #include <netinet/tcp.h>
 115 #include <netinet/tcp_fsm.h>
 116 #include <netinet/tcp_seq.h>
 117 #include <netinet/tcp_timer.h>
 118 #include <netinet/tcp_timer2.h>
 119 #include <netinet/tcp_var.h>
 120 #include <netinet/tcpip.h>
 121 #ifdef TCPDEBUG
 122 #include <netinet/tcp_debug.h>
 123 #endif
 124
 125 #ifdef IPSEC
 126 #include <netinet6/ipsec.h>
 127 #endif /*IPSEC*/
 128
 129 /*
 130  * TCP protocol interface to socket abstraction.
 131  */
 132 extern  char *tcpstates[];      /* XXX ??? */
 133
 134 static int      tcp_attach (struct socket *, struct pru_attach_info *);
 135 static void     tcp_connect (netmsg_t msg);
 136 #ifdef INET6
 137 static void     tcp6_connect (netmsg_t msg);
 138 static int      tcp6_connect_oncpu(struct tcpcb *tp, int flags,
 139                                 struct mbuf **mp,
 140                                 struct sockaddr_in6 *sin6,
 141                                 struct in6_addr *addr6);
 142 #endif /* INET6 */
 143 static struct tcpcb *
 144                 tcp_disconnect (struct tcpcb *);
 145 static struct tcpcb *
 146                 tcp_usrclosed (struct tcpcb *);
 147
 148 #ifdef TCPDEBUG
 149 #define TCPDEBUG0       int ostate = 0
 150 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 151 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 152                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 153 #else
 154 #define TCPDEBUG0
 155 #define TCPDEBUG1()
 156 #define TCPDEBUG2(req)
 157 #endif
 158
 159 static int      tcp_lport_extension = 1;
 160 SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
 161     &tcp_lport_extension, 0, "");
 162
 163 /*
 164  * For some ill optimized programs, which try to use TCP_NOPUSH
 165  * to improve performance, will have small amount of data sits
 166  * in the sending buffer.  These small amount of data will _not_
 167  * be pushed into the network until more data are written into
 168  * the socket or the socket write side is shutdown.
 169  */
 170 static int      tcp_disable_nopush = 1;
 171 SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW,
 172     &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect");
 173
 174 /*
 175  * TCP attaches to socket via pru_attach(), reserving space,
 176  * and an internet control block.  This is likely occuring on
 177  * cpu0 and may have to move later when we bind/connect.
 178  */
 179 static void
 180 tcp_usr_attach(netmsg_t msg)
 181 {
 182         struct socket *so = msg->base.nm_so;
 183         struct pru_attach_info *ai = msg->attach.nm_ai;
 184         int error;
 185         struct inpcb *inp;
 186         struct tcpcb *tp = NULL;
 187         TCPDEBUG0;
 188
 189         soreference(so);
 190         inp = so->so_pcb;
 191         TCPDEBUG1();
 192         if (inp) {
 193                 error = EISCONN;
 194                 goto out;
 195         }
 196
 197         error = tcp_attach(so, ai);
 198         if (error)
 199                 goto out;
 200
 201         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 202                 so->so_linger = TCP_LINGERTIME;
 203         tp = sototcpcb(so);
 204 out:
 205         sofree(so);             /* from ref above */
 206         TCPDEBUG2(PRU_ATTACH);
 207         lwkt_replymsg(&msg->lmsg, error);
 208 }
 209
 210 /*
 211  * pru_detach() detaches the TCP protocol from the socket.
 212  * If the protocol state is non-embryonic, then can't
 213  * do this directly: have to initiate a pru_disconnect(),
 214  * which may finish later; embryonic TCB's can just
 215  * be discarded here.
 216  */
 217 static void
 218 tcp_usr_detach(netmsg_t msg)
 219 {
 220         struct socket *so = msg->base.nm_so;
 221         int error = 0;
 222         struct inpcb *inp;
 223         struct tcpcb *tp;
 224         TCPDEBUG0;
 225
 226         inp = so->so_pcb;
 227
 228         /*
 229          * If the inp is already detached it may have been due to an async
 230          * close.  Just return as if no error occured.
 231          *
 232          * It's possible for the tcpcb (tp) to disconnect from the inp due
 233          * to tcp_drop()->tcp_close() being called.  This may occur *after*
 234          * the detach message has been queued so we may find a NULL tp here.
 235          */
 236         if (inp) {
 237                 if ((tp = intotcpcb(inp)) != NULL) {
 238                         TCPDEBUG1();
 239                         tp = tcp_disconnect(tp);
 240                         TCPDEBUG2(PRU_DETACH);
 241                 }
 242         }
 243         lwkt_replymsg(&msg->lmsg, error);
 244 }
 245
 246 /*
 247  * NOTE: ignore_error is non-zero for certain disconnection races
 248  * which we want to silently allow, otherwise close() may return
 249  * an unexpected error.
 250  *
 251  * NOTE: The variables (msg) and (tp) are assumed.
 252  */
 253 #define COMMON_START(so, inp, ignore_error)                     \
 254         TCPDEBUG0;                                              \
 255                                                                 \
 256         inp = so->so_pcb;                                       \
 257         do {                                                    \
 258                  if (inp == NULL) {                             \
 259                         error = ignore_error ? 0 : EINVAL;      \
 260                         tp = NULL;                              \
 261                         goto out;                               \
 262                  }                                              \
 263                  tp = intotcpcb(inp);                           \
 264                  TCPDEBUG1();                                   \
 265         } while(0)
 266
 267 #define COMMON_END1(req, noreply)                               \
 268         out: do {                                               \
 269                 TCPDEBUG2(req);                                 \
 270                 if (!(noreply))                                 \
 271                         lwkt_replymsg(&msg->lmsg, error);       \
 272                 return;                                         \
 273         } while(0)
 274
 275 #define COMMON_END(req)         COMMON_END1((req), 0)
 276
 277 /*
 278  * Give the socket an address.
 279  */
 280 static void
 281 tcp_usr_bind(netmsg_t msg)
 282 {
 283         struct socket *so = msg->bind.base.nm_so;
 284         struct sockaddr *nam = msg->bind.nm_nam;
 285         struct thread *td = msg->bind.nm_td;
 286         int error = 0;
 287         struct inpcb *inp;
 288         struct tcpcb *tp;
 289         struct sockaddr_in *sinp;
 290
 291         COMMON_START(so, inp, 0);
 292
 293         /*
 294          * Must check for multicast addresses and disallow binding
 295          * to them.
 296          */
 297         sinp = (struct sockaddr_in *)nam;
 298         if (sinp->sin_family == AF_INET &&
 299             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 300                 error = EAFNOSUPPORT;
 301                 goto out;
 302         }
 303         error = in_pcbbind(inp, nam, td);
 304         if (error)
 305                 goto out;
 306         COMMON_END(PRU_BIND);
 307
 308 }
 309
 310 #ifdef INET6
 311
 312 static void
 313 tcp6_usr_bind(netmsg_t msg)
 314 {
 315         struct socket *so = msg->bind.base.nm_so;
 316         struct sockaddr *nam = msg->bind.nm_nam;
 317         struct thread *td = msg->bind.nm_td;
 318         int error = 0;
 319         struct inpcb *inp;
 320         struct tcpcb *tp;
 321         struct sockaddr_in6 *sin6p;
 322
 323         COMMON_START(so, inp, 0);
 324
 325         /*
 326          * Must check for multicast addresses and disallow binding
 327          * to them.
 328          */
 329         sin6p = (struct sockaddr_in6 *)nam;
 330         if (sin6p->sin6_family == AF_INET6 &&
 331             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
 332                 error = EAFNOSUPPORT;
 333                 goto out;
 334         }
 335         inp->inp_vflag &= ~INP_IPV4;
 336         inp->inp_vflag |= INP_IPV6;
 337         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 338                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 339                         inp->inp_vflag |= INP_IPV4;
 340                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 341                         struct sockaddr_in sin;
 342
 343                         in6_sin6_2_sin(&sin, sin6p);
 344                         inp->inp_vflag |= INP_IPV4;
 345                         inp->inp_vflag &= ~INP_IPV6;
 346                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 347                         goto out;
 348                 }
 349         }
 350         error = in6_pcbbind(inp, nam, td);
 351         if (error)
 352                 goto out;
 353         COMMON_END(PRU_BIND);
 354 }
 355 #endif /* INET6 */
 356
 357 struct netmsg_inswildcard {
 358         struct netmsg_base      base;
 359         struct inpcb            *nm_inp;
 360 };
 361
 362 static void
 363 in_pcbinswildcardhash_handler(netmsg_t msg)
 364 {
 365         struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
 366         int cpu = mycpuid, nextcpu;
 367
 368         in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
 369
 370         nextcpu = cpu + 1;
 371         if (nextcpu < ncpus2)
 372                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
 373         else
 374                 lwkt_replymsg(&nm->base.lmsg, 0);
 375 }
 376
 377 /*
 378  * Prepare to accept connections.
 379  */
 380 static void
 381 tcp_usr_listen(netmsg_t msg)
 382 {
 383         struct socket *so = msg->listen.base.nm_so;
 384         struct thread *td = msg->listen.nm_td;
 385         int error = 0;
 386         struct inpcb *inp;
 387         struct tcpcb *tp;
 388         struct netmsg_inswildcard nm;
 389
 390         COMMON_START(so, inp, 0);
 391
 392         if (tp->t_flags & TF_LISTEN)
 393                 goto out;
 394
 395         if (inp->inp_lport == 0) {
 396                 error = in_pcbbind(inp, NULL, td);
 397                 if (error)
 398                         goto out;
 399         }
 400
 401         tp->t_state = TCPS_LISTEN;
 402         tp->t_flags |= TF_LISTEN;
 403         tp->tt_msg = NULL; /* Catch any invalid timer usage */
 404
 405         if (ncpus > 1) {
 406                 /*
 407                  * We have to set the flag because we can't have other cpus
 408                  * messing with our inp's flags.
 409                  */
 410                 KASSERT(!(inp->inp_flags & INP_CONNECTED),
 411                         ("already on connhash"));
 412                 KASSERT(!(inp->inp_flags & INP_WILDCARD),
 413                         ("already on wildcardhash"));
 414                 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
 415                         ("already on MP wildcardhash"));
 416                 inp->inp_flags |= INP_WILDCARD_MP;
 417
 418                 KKASSERT(so->so_port == netisr_cpuport(0));
 419                 KKASSERT(&curthread->td_msgport == netisr_cpuport(0));
 420                 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
 421
 422                 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
 423                             MSGF_PRIORITY, in_pcbinswildcardhash_handler);
 424                 nm.nm_inp = inp;
 425                 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0);
 426         }
 427         in_pcbinswildcardhash(inp);
 428         COMMON_END(PRU_LISTEN);
 429 }
 430
 431 #ifdef INET6
 432
 433 static void
 434 tcp6_usr_listen(netmsg_t msg)
 435 {
 436         struct socket *so = msg->listen.base.nm_so;
 437         struct thread *td = msg->listen.nm_td;
 438         int error = 0;
 439         struct inpcb *inp;
 440         struct tcpcb *tp;
 441         struct netmsg_inswildcard nm;
 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         if (ncpus > 1) {
 463                 /*
 464                  * We have to set the flag because we can't have other cpus
 465                  * messing with our inp's flags.
 466                  */
 467                 KASSERT(!(inp->inp_flags & INP_CONNECTED),
 468                         ("already on connhash"));
 469                 KASSERT(!(inp->inp_flags & INP_WILDCARD),
 470                         ("already on wildcardhash"));
 471                 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
 472                         ("already on MP wildcardhash"));
 473                 inp->inp_flags |= INP_WILDCARD_MP;
 474
 475                 KKASSERT(so->so_port == netisr_cpuport(0));
 476                 KKASSERT(&curthread->td_msgport == netisr_cpuport(0));
 477                 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
 478
 479                 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
 480                             MSGF_PRIORITY, in_pcbinswildcardhash_handler);
 481                 nm.nm_inp = inp;
 482                 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0);
 483         }
 484         in_pcbinswildcardhash(inp);
 485         COMMON_END(PRU_LISTEN);
 486 }
 487 #endif /* INET6 */
 488
 489 /*
 490  * Initiate connection to peer.
 491  * Create a template for use in transmissions on this connection.
 492  * Enter SYN_SENT state, and mark socket as connecting.
 493  * Start keep-alive timer, and seed output sequence space.
 494  * Send initial segment on connection.
 495  */
 496 static void
 497 tcp_usr_connect(netmsg_t msg)
 498 {
 499         struct socket *so = msg->connect.base.nm_so;
 500         struct sockaddr *nam = msg->connect.nm_nam;
 501         struct thread *td = msg->connect.nm_td;
 502         int error = 0;
 503         struct inpcb *inp;
 504         struct tcpcb *tp;
 505         struct sockaddr_in *sinp;
 506
 507         COMMON_START(so, inp, 0);
 508
 509         /*
 510          * Must disallow TCP ``connections'' to multicast addresses.
 511          */
 512         sinp = (struct sockaddr_in *)nam;
 513         if (sinp->sin_family == AF_INET
 514             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
 515                 error = EAFNOSUPPORT;
 516                 goto out;
 517         }
 518
 519         if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
 520                 error = EAFNOSUPPORT; /* IPv6 only jail */
 521                 goto out;
 522         }
 523
 524         tcp_connect(msg);
 525         /* msg is invalid now */
 526         return;
 527 out:
 528         if (msg->connect.nm_m) {
 529                 m_freem(msg->connect.nm_m);
 530                 msg->connect.nm_m = NULL;
 531         }
 532         lwkt_replymsg(&msg->lmsg, error);
 533 }
 534
 535 #ifdef INET6
 536
 537 static void
 538 tcp6_usr_connect(netmsg_t msg)
 539 {
 540         struct socket *so = msg->connect.base.nm_so;
 541         struct sockaddr *nam = msg->connect.nm_nam;
 542         struct thread *td = msg->connect.nm_td;
 543         int error = 0;
 544         struct inpcb *inp;
 545         struct tcpcb *tp;
 546         struct sockaddr_in6 *sin6p;
 547
 548         COMMON_START(so, inp, 0);
 549
 550         /*
 551          * Must disallow TCP ``connections'' to multicast addresses.
 552          */
 553         sin6p = (struct sockaddr_in6 *)nam;
 554         if (sin6p->sin6_family == AF_INET6
 555             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
 556                 error = EAFNOSUPPORT;
 557                 goto out;
 558         }
 559
 560         if (!prison_remote_ip(td, nam)) {
 561                 error = EAFNOSUPPORT; /* IPv4 only jail */
 562                 goto out;
 563         }
 564
 565         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 566                 struct sockaddr_in *sinp;
 567
 568                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 569                         error = EINVAL;
 570                         goto out;
 571                 }
 572                 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
 573                 in6_sin6_2_sin(sinp, sin6p);
 574                 inp->inp_vflag |= INP_IPV4;
 575                 inp->inp_vflag &= ~INP_IPV6;
 576                 msg->connect.nm_nam = (struct sockaddr *)sinp;
 577                 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC;
 578                 tcp_connect(msg);
 579                 /* msg is invalid now */
 580                 return;
 581         }
 582         inp->inp_vflag &= ~INP_IPV4;
 583         inp->inp_vflag |= INP_IPV6;
 584         inp->inp_inc.inc_isipv6 = 1;
 585
 586         msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
 587         tcp6_connect(msg);
 588         /* msg is invalid now */
 589         return;
 590 out:
 591         if (msg->connect.nm_m) {
 592                 m_freem(msg->connect.nm_m);
 593                 msg->connect.nm_m = NULL;
 594         }
 595         lwkt_replymsg(&msg->lmsg, error);
 596 }
 597
 598 #endif /* INET6 */
 599
 600 /*
 601  * Initiate disconnect from peer.
 602  * If connection never passed embryonic stage, just drop;
 603  * else if don't need to let data drain, then can just drop anyways,
 604  * else have to begin TCP shutdown process: mark socket disconnecting,
 605  * drain unread data, state switch to reflect user close, and
 606  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 607  * when peer sends FIN and acks ours.
 608  *
 609  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 610  */
 611 static void
 612 tcp_usr_disconnect(netmsg_t msg)
 613 {
 614         struct socket *so = msg->disconnect.base.nm_so;
 615         int error = 0;
 616         struct inpcb *inp;
 617         struct tcpcb *tp;
 618
 619         COMMON_START(so, inp, 1);
 620         tp = tcp_disconnect(tp);
 621         COMMON_END(PRU_DISCONNECT);
 622 }
 623
 624 /*
 625  * Accept a connection.  Essentially all the work is
 626  * done at higher levels; just return the address
 627  * of the peer, storing through addr.
 628  */
 629 static void
 630 tcp_usr_accept(netmsg_t msg)
 631 {
 632         struct socket *so = msg->accept.base.nm_so;
 633         struct sockaddr **nam = msg->accept.nm_nam;
 634         int error = 0;
 635         struct inpcb *inp;
 636         struct tcpcb *tp = NULL;
 637         TCPDEBUG0;
 638
 639         inp = so->so_pcb;
 640         if (so->so_state & SS_ISDISCONNECTED) {
 641                 error = ECONNABORTED;
 642                 goto out;
 643         }
 644         if (inp == 0) {
 645                 error = EINVAL;
 646                 goto out;
 647         }
 648
 649         tp = intotcpcb(inp);
 650         TCPDEBUG1();
 651         in_setpeeraddr(so, nam);
 652         COMMON_END(PRU_ACCEPT);
 653 }
 654
 655 #ifdef INET6
 656 static void
 657 tcp6_usr_accept(netmsg_t msg)
 658 {
 659         struct socket *so = msg->accept.base.nm_so;
 660         struct sockaddr **nam = msg->accept.nm_nam;
 661         int error = 0;
 662         struct inpcb *inp;
 663         struct tcpcb *tp = NULL;
 664         TCPDEBUG0;
 665
 666         inp = so->so_pcb;
 667
 668         if (so->so_state & SS_ISDISCONNECTED) {
 669                 error = ECONNABORTED;
 670                 goto out;
 671         }
 672         if (inp == 0) {
 673                 error = EINVAL;
 674                 goto out;
 675         }
 676         tp = intotcpcb(inp);
 677         TCPDEBUG1();
 678         in6_mapped_peeraddr(so, nam);
 679         COMMON_END(PRU_ACCEPT);
 680 }
 681 #endif /* INET6 */
 682 /*
 683  * Mark the connection as being incapable of further output.
 684  */
 685 static void
 686 tcp_usr_shutdown(netmsg_t msg)
 687 {
 688         struct socket *so = msg->shutdown.base.nm_so;
 689         int error = 0;
 690         struct inpcb *inp;
 691         struct tcpcb *tp;
 692
 693         COMMON_START(so, inp, 0);
 694         socantsendmore(so);
 695         tp = tcp_usrclosed(tp);
 696         if (tp)
 697                 error = tcp_output(tp);
 698         COMMON_END(PRU_SHUTDOWN);
 699 }
 700
 701 /*
 702  * After a receive, possibly send window update to peer.
 703  */
 704 static void
 705 tcp_usr_rcvd(netmsg_t msg)
 706 {
 707         struct socket *so = msg->rcvd.base.nm_so;
 708         int error = 0, noreply = 0;
 709         struct inpcb *inp;
 710         struct tcpcb *tp;
 711
 712         COMMON_START(so, inp, 0);
 713
 714         if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) {
 715                 noreply = 1;
 716                 so_async_rcvd_reply(so);
 717         }
 718         tcp_output(tp);
 719
 720         COMMON_END1(PRU_RCVD, noreply);
 721 }
 722
 723 /*
 724  * Do a send by putting data in output queue and updating urgent
 725  * marker if URG set.  Possibly send more data.  Unlike the other
 726  * pru_*() routines, the mbuf chains are our responsibility.  We
 727  * must either enqueue them or free them.  The other pru_* routines
 728  * generally are caller-frees.
 729  */
 730 static void
 731 tcp_usr_send(netmsg_t msg)
 732 {
 733         struct socket *so = msg->send.base.nm_so;
 734         int flags = msg->send.nm_flags;
 735         struct mbuf *m = msg->send.nm_m;
 736         int error = 0;
 737         struct inpcb *inp;
 738         struct tcpcb *tp;
 739         TCPDEBUG0;
 740
 741         KKASSERT(msg->send.nm_control == NULL);
 742         KKASSERT(msg->send.nm_addr == NULL);
 743         KKASSERT((flags & PRUS_FREEADDR) == 0);
 744
 745         inp = so->so_pcb;
 746
 747         if (inp == NULL) {
 748                 /*
 749                  * OOPS! we lost a race, the TCP session got reset after
 750                  * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
 751                  * network interrupt in the non-critical section of sosend().
 752                  */
 753                 m_freem(m);
 754                 error = ECONNRESET;     /* XXX EPIPE? */
 755                 tp = NULL;
 756                 TCPDEBUG1();
 757                 goto out;
 758         }
 759         tp = intotcpcb(inp);
 760         TCPDEBUG1();
 761
 762 #ifdef foo
 763         /*
 764          * This is no longer necessary, since:
 765          * - sosendtcp() has already checked it for us
 766          * - It does not work with asynchronized send
 767          */
 768
 769         /*
 770          * Don't let too much OOB data build up
 771          */
 772         if (flags & PRUS_OOB) {
 773                 if (ssb_space(&so->so_snd) < -512) {
 774                         m_freem(m);
 775                         error = ENOBUFS;
 776                         goto out;
 777                 }
 778         }
 779 #endif
 780
 781         /*
 782          * Pump the data into the socket.
 783          */
 784         if (m)
 785                 ssb_appendstream(&so->so_snd, m);
 786         if (flags & PRUS_OOB) {
 787                 /*
 788                  * According to RFC961 (Assigned Protocols),
 789                  * the urgent pointer points to the last octet
 790                  * of urgent data.  We continue, however,
 791                  * to consider it to indicate the first octet
 792                  * of data past the urgent section.
 793                  * Otherwise, snd_up should be one lower.
 794                  */
 795                 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
 796                 tp->t_flags |= TF_FORCE;
 797                 error = tcp_output(tp);
 798                 tp->t_flags &= ~TF_FORCE;
 799         } else {
 800                 if (flags & PRUS_EOF) {
 801                         /*
 802                          * Close the send side of the connection after
 803                          * the data is sent.
 804                          */
 805                         socantsendmore(so);
 806                         tp = tcp_usrclosed(tp);
 807                 }
 808                 if (tp != NULL && !tcp_output_pending(tp)) {
 809                         if (flags & PRUS_MORETOCOME)
 810                                 tp->t_flags |= TF_MORETOCOME;
 811                         error = tcp_output_fair(tp);
 812                         if (flags & PRUS_MORETOCOME)
 813                                 tp->t_flags &= ~TF_MORETOCOME;
 814                 }
 815         }
 816         COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
 817                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
 818                    (flags & PRUS_NOREPLY));
 819 }
 820
 821 /*
 822  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 823  *       will sofree() it when we return.
 824  */
 825 static void
 826 tcp_usr_abort(netmsg_t msg)
 827 {
 828         struct socket *so = msg->abort.base.nm_so;
 829         int error = 0;
 830         struct inpcb *inp;
 831         struct tcpcb *tp;
 832
 833         COMMON_START(so, inp, 1);
 834         tp = tcp_drop(tp, ECONNABORTED);
 835         COMMON_END(PRU_ABORT);
 836 }
 837
 838 /*
 839  * Receive out-of-band data.
 840  */
 841 static void
 842 tcp_usr_rcvoob(netmsg_t msg)
 843 {
 844         struct socket *so = msg->rcvoob.base.nm_so;
 845         struct mbuf *m = msg->rcvoob.nm_m;
 846         int flags = msg->rcvoob.nm_flags;
 847         int error = 0;
 848         struct inpcb *inp;
 849         struct tcpcb *tp;
 850
 851         COMMON_START(so, inp, 0);
 852         if ((so->so_oobmark == 0 &&
 853              (so->so_state & SS_RCVATMARK) == 0) ||
 854             so->so_options & SO_OOBINLINE ||
 855             tp->t_oobflags & TCPOOB_HADDATA) {
 856                 error = EINVAL;
 857                 goto out;
 858         }
 859         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
 860                 error = EWOULDBLOCK;
 861                 goto out;
 862         }
 863         m->m_len = 1;
 864         *mtod(m, caddr_t) = tp->t_iobc;
 865         if ((flags & MSG_PEEK) == 0)
 866                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
 867         COMMON_END(PRU_RCVOOB);
 868 }
 869
 870 static void
 871 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
 872 {
 873         in_savefaddr(so, faddr);
 874 }
 875
 876 #ifdef INET6
 877 static void
 878 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
 879 {
 880         in6_mapped_savefaddr(so, faddr);
 881 }
 882 #endif
 883
 884 /* xxx - should be const */
 885 struct pr_usrreqs tcp_usrreqs = {
 886         .pru_abort = tcp_usr_abort,
 887         .pru_accept = tcp_usr_accept,
 888         .pru_attach = tcp_usr_attach,
 889         .pru_bind = tcp_usr_bind,
 890         .pru_connect = tcp_usr_connect,
 891         .pru_connect2 = pr_generic_notsupp,
 892         .pru_control = in_control_dispatch,
 893         .pru_detach = tcp_usr_detach,
 894         .pru_disconnect = tcp_usr_disconnect,
 895         .pru_listen = tcp_usr_listen,
 896         .pru_peeraddr = in_setpeeraddr_dispatch,
 897         .pru_rcvd = tcp_usr_rcvd,
 898         .pru_rcvoob = tcp_usr_rcvoob,
 899         .pru_send = tcp_usr_send,
 900         .pru_sense = pru_sense_null,
 901         .pru_shutdown = tcp_usr_shutdown,
 902         .pru_sockaddr = in_setsockaddr_dispatch,
 903         .pru_sosend = sosendtcp,
 904         .pru_soreceive = sorecvtcp,
 905         .pru_savefaddr = tcp_usr_savefaddr
 906 };
 907
 908 #ifdef INET6
 909 struct pr_usrreqs tcp6_usrreqs = {
 910         .pru_abort = tcp_usr_abort,
 911         .pru_accept = tcp6_usr_accept,
 912         .pru_attach = tcp_usr_attach,
 913         .pru_bind = tcp6_usr_bind,
 914         .pru_connect = tcp6_usr_connect,
 915         .pru_connect2 = pr_generic_notsupp,
 916         .pru_control = in6_control_dispatch,
 917         .pru_detach = tcp_usr_detach,
 918         .pru_disconnect = tcp_usr_disconnect,
 919         .pru_listen = tcp6_usr_listen,
 920         .pru_peeraddr = in6_mapped_peeraddr_dispatch,
 921         .pru_rcvd = tcp_usr_rcvd,
 922         .pru_rcvoob = tcp_usr_rcvoob,
 923         .pru_send = tcp_usr_send,
 924         .pru_sense = pru_sense_null,
 925         .pru_shutdown = tcp_usr_shutdown,
 926         .pru_sockaddr = in6_mapped_sockaddr_dispatch,
 927         .pru_sosend = sosendtcp,
 928         .pru_soreceive = sorecvtcp,
 929         .pru_savefaddr = tcp6_usr_savefaddr
 930 };
 931 #endif /* INET6 */
 932
 933 static int
 934 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
 935                   struct sockaddr_in *sin, struct sockaddr_in *if_sin)
 936 {
 937         struct inpcb *inp = tp->t_inpcb, *oinp;
 938         struct socket *so = inp->inp_socket;
 939         struct route *ro = &inp->inp_route;
 940
 941         oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
 942                                  sin->sin_addr, sin->sin_port,
 943                                  (inp->inp_laddr.s_addr != INADDR_ANY ?
 944                                   inp->inp_laddr : if_sin->sin_addr),
 945                                 inp->inp_lport, 0, NULL);
 946         if (oinp != NULL) {
 947                 m_freem(m);
 948                 return (EADDRINUSE);
 949         }
 950         if (inp->inp_laddr.s_addr == INADDR_ANY)
 951                 inp->inp_laddr = if_sin->sin_addr;
 952         inp->inp_faddr = sin->sin_addr;
 953         inp->inp_fport = sin->sin_port;
 954         inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
 955         in_pcbinsconnhash(inp);
 956
 957         /*
 958          * We are now on the inpcb's owner CPU, if the cached route was
 959          * freed because the rtentry's owner CPU is not the current CPU
 960          * (e.g. in tcp_connect()), then we try to reallocate it here with
 961          * the hope that a rtentry may be cloned from a RTF_PRCLONING
 962          * rtentry.
 963          */
 964         if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
 965             ro->ro_rt == NULL) {
 966                 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
 967                 ro->ro_dst.sa_family = AF_INET;
 968                 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
 969                 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
 970                         sin->sin_addr;
 971                 rtalloc(ro);
 972         }
 973
 974         /*
 975          * Now that no more errors can occur, change the protocol processing
 976          * port to the current thread (which is the correct thread).
 977          *
 978          * Create TCP timer message now; we are on the tcpcb's owner
 979          * CPU/thread.
 980          */
 981         tcp_create_timermsg(tp, &curthread->td_msgport);
 982
 983         /*
 984          * Compute window scaling to request.  Use a larger scaling then
 985          * needed for the initial receive buffer in case the receive buffer
 986          * gets expanded.
 987          */
 988         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
 989                 tp->request_r_scale = TCP_MIN_WINSHIFT;
 990         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
 991                (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
 992         ) {
 993                 tp->request_r_scale++;
 994         }
 995
 996         soisconnecting(so);
 997         tcpstat.tcps_connattempt++;
 998         tp->t_state = TCPS_SYN_SENT;
 999         tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1000         tp->iss = tcp_new_isn(tp);
1001         tcp_sendseqinit(tp);
1002         if (m) {
1003                 ssb_appendstream(&so->so_snd, m);
1004                 m = NULL;
1005                 if (flags & PRUS_OOB)
1006                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1007         }
1008
1009         /*
1010          * Close the send side of the connection after
1011          * the data is sent if flagged.
1012          */
1013         if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1014                 socantsendmore(so);
1015                 tp = tcp_usrclosed(tp);
1016         }
1017         return (tcp_output(tp));
1018 }
1019
1020 /*
1021  * Common subroutine to open a TCP connection to remote host specified
1022  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1023  * port number if needed.  Call in_pcbladdr to do the routing and to choose
1024  * a local host address (interface).
1025  * Initialize connection parameters and enter SYN-SENT state.
1026  */
1027 static void
1028 tcp_connect(netmsg_t msg)
1029 {
1030         struct socket *so = msg->connect.base.nm_so;
1031         struct sockaddr *nam = msg->connect.nm_nam;
1032         struct thread *td = msg->connect.nm_td;
1033         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1034         struct sockaddr_in *if_sin;
1035         struct inpcb *inp;
1036         struct tcpcb *tp;
1037         int error, calc_laddr = 1;
1038         lwkt_port_t port;
1039
1040         COMMON_START(so, inp, 0);
1041
1042         /*
1043          * Reconnect our pcb if we have to
1044          */
1045         if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1046                 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1047                 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1048         }
1049
1050         /*
1051          * Bind if we have to
1052          */
1053         if (inp->inp_lport == 0) {
1054                 if (tcp_lport_extension) {
1055                         KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1056
1057                         error = in_pcbladdr(inp, nam, &if_sin, td);
1058                         if (error)
1059                                 goto out;
1060                         inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1061
1062                         error = in_pcbconn_bind(inp, nam, td);
1063                         if (error)
1064                                 goto out;
1065
1066                         calc_laddr = 0;
1067                 } else {
1068                         error = in_pcbbind(inp, NULL, td);
1069                         if (error)
1070                                 goto out;
1071                 }
1072         }
1073
1074         if (calc_laddr) {
1075                 /*
1076                  * Calculate the correct protocol processing thread.  The
1077                  * connect operation must run there.  Set the forwarding
1078                  * port before we forward the message or it will get bounced
1079                  * right back to us.
1080                  */
1081                 error = in_pcbladdr(inp, nam, &if_sin, td);
1082                 if (error)
1083                         goto out;
1084         }
1085         KKASSERT(inp->inp_socket == so);
1086
1087         port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1088                             (inp->inp_laddr.s_addr ?
1089                              inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1090                             inp->inp_lport);
1091
1092         if (port != &curthread->td_msgport) {
1093                 struct route *ro = &inp->inp_route;
1094
1095                 /*
1096                  * in_pcbladdr() may have allocated a route entry for us
1097                  * on the current CPU, but we need a route entry on the
1098                  * inpcb's owner CPU, so free it here.
1099                  */
1100                 if (ro->ro_rt != NULL)
1101                         RTFREE(ro->ro_rt);
1102                 bzero(ro, sizeof(*ro));
1103
1104                 /*
1105                  * We are moving the protocol processing port the socket
1106                  * is on, we have to unlink here and re-link on the
1107                  * target cpu.
1108                  */
1109                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1110                 sosetport(so, port);
1111                 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1112                 msg->connect.base.nm_dispatch = tcp_connect;
1113
1114                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1115                 /* msg invalid now */
1116                 return;
1117         }
1118         error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1119                                   msg->connect.nm_m, sin, if_sin);
1120         msg->connect.nm_m = NULL;
1121 out:
1122         if (msg->connect.nm_m) {
1123                 m_freem(msg->connect.nm_m);
1124                 msg->connect.nm_m = NULL;
1125         }
1126         if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1127                 kfree(msg->connect.nm_nam, M_LWKTMSG);
1128                 msg->connect.nm_nam = NULL;
1129         }
1130         lwkt_replymsg(&msg->connect.base.lmsg, error);
1131         /* msg invalid now */
1132 }
1133
1134 #ifdef INET6
1135
1136 static void
1137 tcp6_connect(netmsg_t msg)
1138 {
1139         struct tcpcb *tp;
1140         struct socket *so = msg->connect.base.nm_so;
1141         struct sockaddr *nam = msg->connect.nm_nam;
1142         struct thread *td = msg->connect.nm_td;
1143         struct inpcb *inp;
1144         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1145         struct in6_addr *addr6;
1146         lwkt_port_t port;
1147         int error;
1148
1149         COMMON_START(so, inp, 0);
1150
1151         /*
1152          * Reconnect our pcb if we have to
1153          */
1154         if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1155                 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1156                 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1157         }
1158
1159         /*
1160          * Bind if we have to
1161          */
1162         if (inp->inp_lport == 0) {
1163                 error = in6_pcbbind(inp, NULL, td);
1164                 if (error)
1165                         goto out;
1166         }
1167
1168         /*
1169          * Cannot simply call in_pcbconnect, because there might be an
1170          * earlier incarnation of this same connection still in
1171          * TIME_WAIT state, creating an ADDRINUSE error.
1172          */
1173         error = in6_pcbladdr(inp, nam, &addr6, td);
1174         if (error)
1175                 goto out;
1176
1177         port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1178
1179         if (port != &curthread->td_msgport) {
1180                 struct route *ro = &inp->inp_route;
1181
1182                 /*
1183                  * in_pcbladdr() may have allocated a route entry for us
1184                  * on the current CPU, but we need a route entry on the
1185                  * inpcb's owner CPU, so free it here.
1186                  */
1187                 if (ro->ro_rt != NULL)
1188                         RTFREE(ro->ro_rt);
1189                 bzero(ro, sizeof(*ro));
1190
1191                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1192                 sosetport(so, port);
1193                 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1194                 msg->connect.base.nm_dispatch = tcp6_connect;
1195
1196                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1197                 /* msg invalid now */
1198                 return;
1199         }
1200         error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1201                                    &msg->connect.nm_m, sin6, addr6);
1202         /* nm_m may still be intact */
1203 out:
1204         if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
1205                 tcp_connect(msg);
1206                 /* msg invalid now */
1207         } else {
1208                 if (msg->connect.nm_m) {
1209                         m_freem(msg->connect.nm_m);
1210                         msg->connect.nm_m = NULL;
1211                 }
1212                 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1213                         kfree(msg->connect.nm_nam, M_LWKTMSG);
1214                         msg->connect.nm_nam = NULL;
1215                 }
1216                 lwkt_replymsg(&msg->connect.base.lmsg, error);
1217                 /* msg invalid now */
1218         }
1219 }
1220
1221 static int
1222 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1223                    struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1224 {
1225         struct mbuf *m = *mp;
1226         struct inpcb *inp = tp->t_inpcb;
1227         struct socket *so = inp->inp_socket;
1228         struct inpcb *oinp;
1229
1230         /*
1231          * Cannot simply call in_pcbconnect, because there might be an
1232          * earlier incarnation of this same connection still in
1233          * TIME_WAIT state, creating an ADDRINUSE error.
1234          */
1235         oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
1236                                   &sin6->sin6_addr, sin6->sin6_port,
1237                                   (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1238                                       addr6 : &inp->in6p_laddr),
1239                                   inp->inp_lport,  0, NULL);
1240         if (oinp)
1241                 return (EADDRINUSE);
1242
1243         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1244                 inp->in6p_laddr = *addr6;
1245         inp->in6p_faddr = sin6->sin6_addr;
1246         inp->inp_fport = sin6->sin6_port;
1247         if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1248                 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1249         in_pcbinsconnhash(inp);
1250
1251         /*
1252          * Now that no more errors can occur, change the protocol processing
1253          * port to the current thread (which is the correct thread).
1254          *
1255          * Create TCP timer message now; we are on the tcpcb's owner
1256          * CPU/thread.
1257          */
1258         tcp_create_timermsg(tp, &curthread->td_msgport);
1259
1260         /* Compute window scaling to request.  */
1261         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1262                 tp->request_r_scale = TCP_MIN_WINSHIFT;
1263         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1264             (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1265                 tp->request_r_scale++;
1266         }
1267
1268         soisconnecting(so);
1269         tcpstat.tcps_connattempt++;
1270         tp->t_state = TCPS_SYN_SENT;
1271         tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1272         tp->iss = tcp_new_isn(tp);
1273         tcp_sendseqinit(tp);
1274         if (m) {
1275                 ssb_appendstream(&so->so_snd, m);
1276                 *mp = NULL;
1277                 if (flags & PRUS_OOB)
1278                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1279         }
1280
1281         /*
1282          * Close the send side of the connection after
1283          * the data is sent if flagged.
1284          */
1285         if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1286                 socantsendmore(so);
1287                 tp = tcp_usrclosed(tp);
1288         }
1289         return (tcp_output(tp));
1290 }
1291
1292 #endif /* INET6 */
1293
1294 /*
1295  * The new sockopt interface makes it possible for us to block in the
1296  * copyin/out step (if we take a page fault).  Taking a page fault while
1297  * in a critical section is probably a Bad Thing.  (Since sockets and pcbs
1298  * both now use TSM, there probably isn't any need for this function to
1299  * run in a critical section any more.  This needs more examination.)
1300  */
1301 void
1302 tcp_ctloutput(netmsg_t msg)
1303 {
1304         struct socket *so = msg->base.nm_so;
1305         struct sockopt *sopt = msg->ctloutput.nm_sopt;
1306         int     error, opt, optval, opthz;
1307         struct  inpcb *inp;
1308         struct  tcpcb *tp;
1309
1310         error = 0;
1311         inp = so->so_pcb;
1312         if (inp == NULL) {
1313                 error = ECONNRESET;
1314                 goto done;
1315         }
1316
1317         if (sopt->sopt_level != IPPROTO_TCP) {
1318 #ifdef INET6
1319                 if (INP_CHECK_SOCKAF(so, AF_INET6))
1320                         ip6_ctloutput_dispatch(msg);
1321                 else
1322 #endif /* INET6 */
1323                 ip_ctloutput(msg);
1324                 /* msg invalid now */
1325                 return;
1326         }
1327         tp = intotcpcb(inp);
1328
1329         switch (sopt->sopt_dir) {
1330         case SOPT_SET:
1331                 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1332                                       sizeof optval);
1333                 if (error)
1334                         break;
1335                 switch (sopt->sopt_name) {
1336                 case TCP_FASTKEEP:
1337                         if (optval > 0)
1338                                 tp->t_keepidle = tp->t_keepintvl;
1339                         else
1340                                 tp->t_keepidle = tcp_keepidle;
1341                         tcp_timer_keep_activity(tp, 0);
1342                         break;
1343 #ifdef TCP_SIGNATURE
1344                 case TCP_SIGNATURE_ENABLE:
1345                         if (tp->t_state == TCPS_CLOSED) {
1346                                 /*
1347                                  * This is the only safe state that this
1348                                  * option could be changed.  Some segments
1349                                  * could already have been sent in other
1350                                  * states.
1351                                  */
1352                                 if (optval > 0)
1353                                         tp->t_flags |= TF_SIGNATURE;
1354                                 else
1355                                         tp->t_flags &= ~TF_SIGNATURE;
1356                         } else {
1357                                 error = EOPNOTSUPP;
1358                         }
1359                         break;
1360 #endif /* TCP_SIGNATURE */
1361                 case TCP_NODELAY:
1362                 case TCP_NOOPT:
1363                         switch (sopt->sopt_name) {
1364                         case TCP_NODELAY:
1365                                 opt = TF_NODELAY;
1366                                 break;
1367                         case TCP_NOOPT:
1368                                 opt = TF_NOOPT;
1369                                 break;
1370                         default:
1371                                 opt = 0; /* dead code to fool gcc */
1372                                 break;
1373                         }
1374
1375                         if (optval)
1376                                 tp->t_flags |= opt;
1377                         else
1378                                 tp->t_flags &= ~opt;
1379                         break;
1380
1381                 case TCP_NOPUSH:
1382                         if (tcp_disable_nopush)
1383                                 break;
1384                         if (optval)
1385                                 tp->t_flags |= TF_NOPUSH;
1386                         else {
1387                                 tp->t_flags &= ~TF_NOPUSH;
1388                                 error = tcp_output(tp);
1389                         }
1390                         break;
1391
1392                 case TCP_MAXSEG:
1393                         /*
1394                          * Must be between 0 and maxseg.  If the requested
1395                          * maxseg is too small to satisfy the desired minmss,
1396                          * pump it up (silently so sysctl modifications of
1397                          * minmss do not create unexpected program failures).
1398                          * Handle degenerate cases.
1399                          */
1400                         if (optval > 0 && optval <= tp->t_maxseg) {
1401                                 if (optval + 40 < tcp_minmss) {
1402                                         optval = tcp_minmss - 40;
1403                                         if (optval < 0)
1404                                                 optval = 1;
1405                                 }
1406                                 tp->t_maxseg = optval;
1407                         } else {
1408                                 error = EINVAL;
1409                         }
1410                         break;
1411
1412                 case TCP_KEEPINIT:
1413                         opthz = ((int64_t)optval * hz) / 1000;
1414                         if (opthz >= 1)
1415                                 tp->t_keepinit = opthz;
1416                         else
1417                                 error = EINVAL;
1418                         break;
1419
1420                 case TCP_KEEPIDLE:
1421                         opthz = ((int64_t)optval * hz) / 1000;
1422                         if (opthz >= 1) {
1423                                 tp->t_keepidle = opthz;
1424                                 tcp_timer_keep_activity(tp, 0);
1425                         } else {
1426                                 error = EINVAL;
1427                         }
1428                         break;
1429
1430                 case TCP_KEEPINTVL:
1431                         opthz = ((int64_t)optval * hz) / 1000;
1432                         if (opthz >= 1) {
1433                                 tp->t_keepintvl = opthz;
1434                                 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1435                         } else {
1436                                 error = EINVAL;
1437                         }
1438                         break;
1439
1440                 case TCP_KEEPCNT:
1441                         if (optval > 0) {
1442                                 tp->t_keepcnt = optval;
1443                                 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1444                         } else {
1445                                 error = EINVAL;
1446                         }
1447                         break;
1448
1449                 default:
1450                         error = ENOPROTOOPT;
1451                         break;
1452                 }
1453                 break;
1454
1455         case SOPT_GET:
1456                 switch (sopt->sopt_name) {
1457 #ifdef TCP_SIGNATURE
1458                 case TCP_SIGNATURE_ENABLE:
1459                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1460                         break;
1461 #endif /* TCP_SIGNATURE */
1462                 case TCP_NODELAY:
1463                         optval = tp->t_flags & TF_NODELAY;
1464                         break;
1465                 case TCP_MAXSEG:
1466                         optval = tp->t_maxseg;
1467                         break;
1468                 case TCP_NOOPT:
1469                         optval = tp->t_flags & TF_NOOPT;
1470                         break;
1471                 case TCP_NOPUSH:
1472                         optval = tp->t_flags & TF_NOPUSH;
1473                         break;
1474                 case TCP_KEEPINIT:
1475                         optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1476                         break;
1477                 case TCP_KEEPIDLE:
1478                         optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1479                         break;
1480                 case TCP_KEEPINTVL:
1481                         optval = ((int64_t)tp->t_keepintvl * 1000) / hz;
1482                         break;
1483                 case TCP_KEEPCNT:
1484                         optval = tp->t_keepcnt;
1485                         break;
1486                 default:
1487                         error = ENOPROTOOPT;
1488                         break;
1489                 }
1490                 if (error == 0)
1491                         soopt_from_kbuf(sopt, &optval, sizeof optval);
1492                 break;
1493         }
1494 done:
1495         lwkt_replymsg(&msg->lmsg, error);
1496 }
1497
1498 /*
1499  * tcp_sendspace and tcp_recvspace are the default send and receive window
1500  * sizes, respectively.  These are obsolescent (this information should
1501  * be set by the route).
1502  *
1503  * Use a default that does not require tcp window scaling to be turned
1504  * on.  Individual programs or the administrator can increase the default.
1505  */
1506 u_long  tcp_sendspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1507 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1508     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1509 u_long  tcp_recvspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1510 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1511     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1512
1513 /*
1514  * Attach TCP protocol to socket, allocating internet protocol control
1515  * block, tcp control block, bufer space, and entering LISTEN state
1516  * if to accept connections.
1517  */
1518 static int
1519 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1520 {
1521         struct tcpcb *tp;
1522         struct inpcb *inp;
1523         int error;
1524         int cpu;
1525 #ifdef INET6
1526         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1527 #endif
1528
1529         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
1530                 lwkt_gettoken(&so->so_rcv.ssb_token);
1531                 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1532                                   ai->sb_rlimit);
1533                 lwkt_reltoken(&so->so_rcv.ssb_token);
1534                 if (error)
1535                         return (error);
1536         }
1537         atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1538         atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
1539         cpu = mycpu->gd_cpuid;
1540
1541         /*
1542          * Set the default port for protocol processing. This will likely
1543          * change when we connect.
1544          */
1545         error = in_pcballoc(so, &tcbinfo[cpu]);
1546         if (error)
1547                 return (error);
1548         inp = so->so_pcb;
1549 #ifdef INET6
1550         if (isipv6) {
1551                 inp->inp_vflag |= INP_IPV6;
1552                 inp->in6p_hops = -1;    /* use kernel default */
1553         }
1554         else
1555 #endif
1556         inp->inp_vflag |= INP_IPV4;
1557         tp = tcp_newtcpcb(inp);
1558         if (tp == NULL) {
1559                 /*
1560                  * Make sure the socket is destroyed by the pcbdetach.
1561                  */
1562                 soreference(so);
1563 #ifdef INET6
1564                 if (isipv6)
1565                         in6_pcbdetach(inp);
1566                 else
1567 #endif
1568                 in_pcbdetach(inp);
1569                 sofree(so);     /* from ref above */
1570                 return (ENOBUFS);
1571         }
1572         tp->t_state = TCPS_CLOSED;
1573         /* Keep a reference for asynchronized pru_rcvd */
1574         soreference(so);
1575         return (0);
1576 }
1577
1578 /*
1579  * Initiate (or continue) disconnect.
1580  * If embryonic state, just send reset (once).
1581  * If in ``let data drain'' option and linger null, just drop.
1582  * Otherwise (hard), mark socket disconnecting and drop
1583  * current input data; switch states based on user close, and
1584  * send segment to peer (with FIN).
1585  */
1586 static struct tcpcb *
1587 tcp_disconnect(struct tcpcb *tp)
1588 {
1589         struct socket *so = tp->t_inpcb->inp_socket;
1590
1591         if (tp->t_state < TCPS_ESTABLISHED) {
1592                 tp = tcp_close(tp);
1593         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1594                 tp = tcp_drop(tp, 0);
1595         } else {
1596                 lwkt_gettoken(&so->so_rcv.ssb_token);
1597                 soisdisconnecting(so);
1598                 sbflush(&so->so_rcv.sb);
1599                 tp = tcp_usrclosed(tp);
1600                 if (tp)
1601                         tcp_output(tp);
1602                 lwkt_reltoken(&so->so_rcv.ssb_token);
1603         }
1604         return (tp);
1605 }
1606
1607 /*
1608  * User issued close, and wish to trail through shutdown states:
1609  * if never received SYN, just forget it.  If got a SYN from peer,
1610  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1611  * If already got a FIN from peer, then almost done; go to LAST_ACK
1612  * state.  In all other cases, have already sent FIN to peer (e.g.
1613  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1614  * for peer to send FIN or not respond to keep-alives, etc.
1615  * We can let the user exit from the close as soon as the FIN is acked.
1616  */
1617 static struct tcpcb *
1618 tcp_usrclosed(struct tcpcb *tp)
1619 {
1620
1621         switch (tp->t_state) {
1622
1623         case TCPS_CLOSED:
1624         case TCPS_LISTEN:
1625                 tp->t_state = TCPS_CLOSED;
1626                 tp = tcp_close(tp);
1627                 break;
1628
1629         case TCPS_SYN_SENT:
1630         case TCPS_SYN_RECEIVED:
1631                 tp->t_flags |= TF_NEEDFIN;
1632                 break;
1633
1634         case TCPS_ESTABLISHED:
1635                 tp->t_state = TCPS_FIN_WAIT_1;
1636                 break;
1637
1638         case TCPS_CLOSE_WAIT:
1639                 tp->t_state = TCPS_LAST_ACK;
1640                 break;
1641         }
1642         if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1643                 soisdisconnected(tp->t_inpcb->inp_socket);
1644                 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1645                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1646                         tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,
1647                             tcp_timer_2msl);
1648                 }
1649         }
1650         return (tp);
1651 }