sys/netinet/tcp_usrreq.c

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