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sys/netinet/tcp_usrreq.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. 4 * Copyright (c) 2006-2007 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: releng/8.2/sys/netinet/tcp_usrreq.c 218575 2011-02-11 15:14:51Z jhb $"); 36 37 #include "opt_ddb.h" 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 #include "opt_tcpdebug.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/malloc.h> 45 #include <sys/kernel.h> 46 #include <sys/sysctl.h> 47 #include <sys/mbuf.h> 48 #ifdef INET6 49 #include <sys/domain.h> 50 #endif /* INET6 */ 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/protosw.h> 54 #include <sys/proc.h> 55 #include <sys/jail.h> 56 57 #ifdef DDB 58 #include <ddb/ddb.h> 59 #endif 60 61 #include <net/if.h> 62 #include <net/route.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #ifdef INET6 68 #include <netinet/ip6.h> 69 #endif 70 #include <netinet/in_pcb.h> 71 #ifdef INET6 72 #include <netinet6/in6_pcb.h> 73 #endif 74 #include <netinet/in_var.h> 75 #include <netinet/ip_var.h> 76 #ifdef INET6 77 #include <netinet6/ip6_var.h> 78 #include <netinet6/scope6_var.h> 79 #endif 80 #include <netinet/tcp.h> 81 #include <netinet/tcp_fsm.h> 82 #include <netinet/tcp_seq.h> 83 #include <netinet/tcp_timer.h> 84 #include <netinet/tcp_var.h> 85 #include <netinet/tcpip.h> 86 #ifdef TCPDEBUG 87 #include <netinet/tcp_debug.h> 88 #endif 89 #include <netinet/tcp_offload.h> 90 91 /* 92 * TCP protocol interface to socket abstraction. 93 */ 94 static int tcp_attach(struct socket *); 95 static int tcp_connect(struct tcpcb *, struct sockaddr *, 96 struct thread *td); 97 #ifdef INET6 98 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 99 struct thread *td); 100 #endif /* INET6 */ 101 static void tcp_disconnect(struct tcpcb *); 102 static void tcp_usrclosed(struct tcpcb *); 103 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 104 105 #ifdef TCPDEBUG 106 #define TCPDEBUG0 int ostate = 0 107 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 108 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 109 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 110 #else 111 #define TCPDEBUG0 112 #define TCPDEBUG1() 113 #define TCPDEBUG2(req) 114 #endif 115 116 /* 117 * TCP attaches to socket via pru_attach(), reserving space, 118 * and an internet control block. 119 */ 120 static int 121 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 122 { 123 struct inpcb *inp; 124 struct tcpcb *tp = NULL; 125 int error; 126 TCPDEBUG0; 127 128 inp = sotoinpcb(so); 129 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 130 TCPDEBUG1(); 131 132 error = tcp_attach(so); 133 if (error) 134 goto out; 135 136 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 137 so->so_linger = TCP_LINGERTIME; 138 139 inp = sotoinpcb(so); 140 tp = intotcpcb(inp); 141 out: 142 TCPDEBUG2(PRU_ATTACH); 143 return error; 144 } 145 146 /* 147 * tcp_detach is called when the socket layer loses its final reference 148 * to the socket, be it a file descriptor reference, a reference from TCP, 149 * etc. At this point, there is only one case in which we will keep around 150 * inpcb state: time wait. 151 * 152 * This function can probably be re-absorbed back into tcp_usr_detach() now 153 * that there is a single detach path. 154 */ 155 static void 156 tcp_detach(struct socket *so, struct inpcb *inp) 157 { 158 struct tcpcb *tp; 159 160 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 161 INP_WLOCK_ASSERT(inp); 162 163 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 164 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 165 166 tp = intotcpcb(inp); 167 168 if (inp->inp_flags & INP_TIMEWAIT) { 169 /* 170 * There are two cases to handle: one in which the time wait 171 * state is being discarded (INP_DROPPED), and one in which 172 * this connection will remain in timewait. In the former, 173 * it is time to discard all state (except tcptw, which has 174 * already been discarded by the timewait close code, which 175 * should be further up the call stack somewhere). In the 176 * latter case, we detach from the socket, but leave the pcb 177 * present until timewait ends. 178 * 179 * XXXRW: Would it be cleaner to free the tcptw here? 180 */ 181 if (inp->inp_flags & INP_DROPPED) { 182 KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && " 183 "INP_DROPPED && tp != NULL")); 184 in_pcbdetach(inp); 185 in_pcbfree(inp); 186 } else { 187 in_pcbdetach(inp); 188 INP_WUNLOCK(inp); 189 } 190 } else { 191 /* 192 * If the connection is not in timewait, we consider two 193 * two conditions: one in which no further processing is 194 * necessary (dropped || embryonic), and one in which TCP is 195 * not yet done, but no longer requires the socket, so the 196 * pcb will persist for the time being. 197 * 198 * XXXRW: Does the second case still occur? 199 */ 200 if (inp->inp_flags & INP_DROPPED || 201 tp->t_state < TCPS_SYN_SENT) { 202 tcp_discardcb(tp); 203 in_pcbdetach(inp); 204 in_pcbfree(inp); 205 } else 206 in_pcbdetach(inp); 207 } 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(struct socket *so) 219 { 220 struct inpcb *inp; 221 222 inp = sotoinpcb(so); 223 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 224 INP_INFO_WLOCK(&V_tcbinfo); 225 INP_WLOCK(inp); 226 KASSERT(inp->inp_socket != NULL, 227 ("tcp_usr_detach: inp_socket == NULL")); 228 tcp_detach(so, inp); 229 INP_INFO_WUNLOCK(&V_tcbinfo); 230 } 231 232 /* 233 * Give the socket an address. 234 */ 235 static int 236 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 237 { 238 int error = 0; 239 struct inpcb *inp; 240 struct tcpcb *tp = NULL; 241 struct sockaddr_in *sinp; 242 243 sinp = (struct sockaddr_in *)nam; 244 if (nam->sa_len != sizeof (*sinp)) 245 return (EINVAL); 246 /* 247 * Must check for multicast addresses and disallow binding 248 * to them. 249 */ 250 if (sinp->sin_family == AF_INET && 251 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 252 return (EAFNOSUPPORT); 253 254 TCPDEBUG0; 255 INP_INFO_WLOCK(&V_tcbinfo); 256 inp = sotoinpcb(so); 257 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 258 INP_WLOCK(inp); 259 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 260 error = EINVAL; 261 goto out; 262 } 263 tp = intotcpcb(inp); 264 TCPDEBUG1(); 265 error = in_pcbbind(inp, nam, td->td_ucred); 266 out: 267 TCPDEBUG2(PRU_BIND); 268 INP_WUNLOCK(inp); 269 INP_INFO_WUNLOCK(&V_tcbinfo); 270 271 return (error); 272 } 273 274 #ifdef INET6 275 static int 276 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 277 { 278 int error = 0; 279 struct inpcb *inp; 280 struct tcpcb *tp = NULL; 281 struct sockaddr_in6 *sin6p; 282 283 sin6p = (struct sockaddr_in6 *)nam; 284 if (nam->sa_len != sizeof (*sin6p)) 285 return (EINVAL); 286 /* 287 * Must check for multicast addresses and disallow binding 288 * to them. 289 */ 290 if (sin6p->sin6_family == AF_INET6 && 291 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 292 return (EAFNOSUPPORT); 293 294 TCPDEBUG0; 295 INP_INFO_WLOCK(&V_tcbinfo); 296 inp = sotoinpcb(so); 297 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 298 INP_WLOCK(inp); 299 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 300 error = EINVAL; 301 goto out; 302 } 303 tp = intotcpcb(inp); 304 TCPDEBUG1(); 305 inp->inp_vflag &= ~INP_IPV4; 306 inp->inp_vflag |= INP_IPV6; 307 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 308 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 309 inp->inp_vflag |= INP_IPV4; 310 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 311 struct sockaddr_in sin; 312 313 in6_sin6_2_sin(&sin, sin6p); 314 inp->inp_vflag |= INP_IPV4; 315 inp->inp_vflag &= ~INP_IPV6; 316 error = in_pcbbind(inp, (struct sockaddr *)&sin, 317 td->td_ucred); 318 goto out; 319 } 320 } 321 error = in6_pcbbind(inp, nam, td->td_ucred); 322 out: 323 TCPDEBUG2(PRU_BIND); 324 INP_WUNLOCK(inp); 325 INP_INFO_WUNLOCK(&V_tcbinfo); 326 return (error); 327 } 328 #endif /* INET6 */ 329 330 /* 331 * Prepare to accept connections. 332 */ 333 static int 334 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 335 { 336 int error = 0; 337 struct inpcb *inp; 338 struct tcpcb *tp = NULL; 339 340 TCPDEBUG0; 341 INP_INFO_WLOCK(&V_tcbinfo); 342 inp = sotoinpcb(so); 343 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 344 INP_WLOCK(inp); 345 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 346 error = EINVAL; 347 goto out; 348 } 349 tp = intotcpcb(inp); 350 TCPDEBUG1(); 351 SOCK_LOCK(so); 352 error = solisten_proto_check(so); 353 if (error == 0 && inp->inp_lport == 0) 354 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 355 if (error == 0) { 356 tp->t_state = TCPS_LISTEN; 357 solisten_proto(so, backlog); 358 tcp_offload_listen_open(tp); 359 } 360 SOCK_UNLOCK(so); 361 362 out: 363 TCPDEBUG2(PRU_LISTEN); 364 INP_WUNLOCK(inp); 365 INP_INFO_WUNLOCK(&V_tcbinfo); 366 return (error); 367 } 368 369 #ifdef INET6 370 static int 371 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 372 { 373 int error = 0; 374 struct inpcb *inp; 375 struct tcpcb *tp = NULL; 376 377 TCPDEBUG0; 378 INP_INFO_WLOCK(&V_tcbinfo); 379 inp = sotoinpcb(so); 380 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 381 INP_WLOCK(inp); 382 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 383 error = EINVAL; 384 goto out; 385 } 386 tp = intotcpcb(inp); 387 TCPDEBUG1(); 388 SOCK_LOCK(so); 389 error = solisten_proto_check(so); 390 if (error == 0 && inp->inp_lport == 0) { 391 inp->inp_vflag &= ~INP_IPV4; 392 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 393 inp->inp_vflag |= INP_IPV4; 394 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 395 } 396 if (error == 0) { 397 tp->t_state = TCPS_LISTEN; 398 solisten_proto(so, backlog); 399 } 400 SOCK_UNLOCK(so); 401 402 out: 403 TCPDEBUG2(PRU_LISTEN); 404 INP_WUNLOCK(inp); 405 INP_INFO_WUNLOCK(&V_tcbinfo); 406 return (error); 407 } 408 #endif /* INET6 */ 409 410 /* 411 * Initiate connection to peer. 412 * Create a template for use in transmissions on this connection. 413 * Enter SYN_SENT state, and mark socket as connecting. 414 * Start keep-alive timer, and seed output sequence space. 415 * Send initial segment on connection. 416 */ 417 static int 418 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 419 { 420 int error = 0; 421 struct inpcb *inp; 422 struct tcpcb *tp = NULL; 423 struct sockaddr_in *sinp; 424 425 sinp = (struct sockaddr_in *)nam; 426 if (nam->sa_len != sizeof (*sinp)) 427 return (EINVAL); 428 /* 429 * Must disallow TCP ``connections'' to multicast addresses. 430 */ 431 if (sinp->sin_family == AF_INET 432 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 433 return (EAFNOSUPPORT); 434 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 435 return (error); 436 437 TCPDEBUG0; 438 INP_INFO_WLOCK(&V_tcbinfo); 439 inp = sotoinpcb(so); 440 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 441 INP_WLOCK(inp); 442 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 443 error = EINVAL; 444 goto out; 445 } 446 tp = intotcpcb(inp); 447 TCPDEBUG1(); 448 if ((error = tcp_connect(tp, nam, td)) != 0) 449 goto out; 450 error = tcp_output_connect(so, nam); 451 out: 452 TCPDEBUG2(PRU_CONNECT); 453 INP_WUNLOCK(inp); 454 INP_INFO_WUNLOCK(&V_tcbinfo); 455 return (error); 456 } 457 458 #ifdef INET6 459 static int 460 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 461 { 462 int error = 0; 463 struct inpcb *inp; 464 struct tcpcb *tp = NULL; 465 struct sockaddr_in6 *sin6p; 466 467 TCPDEBUG0; 468 469 sin6p = (struct sockaddr_in6 *)nam; 470 if (nam->sa_len != sizeof (*sin6p)) 471 return (EINVAL); 472 /* 473 * Must disallow TCP ``connections'' to multicast addresses. 474 */ 475 if (sin6p->sin6_family == AF_INET6 476 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 477 return (EAFNOSUPPORT); 478 479 INP_INFO_WLOCK(&V_tcbinfo); 480 inp = sotoinpcb(so); 481 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 482 INP_WLOCK(inp); 483 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 484 error = EINVAL; 485 goto out; 486 } 487 tp = intotcpcb(inp); 488 TCPDEBUG1(); 489 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 490 struct sockaddr_in sin; 491 492 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 493 error = EINVAL; 494 goto out; 495 } 496 497 in6_sin6_2_sin(&sin, sin6p); 498 inp->inp_vflag |= INP_IPV4; 499 inp->inp_vflag &= ~INP_IPV6; 500 if ((error = prison_remote_ip4(td->td_ucred, 501 &sin.sin_addr)) != 0) 502 goto out; 503 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 504 goto out; 505 error = tcp_output_connect(so, nam); 506 goto out; 507 } 508 inp->inp_vflag &= ~INP_IPV4; 509 inp->inp_vflag |= INP_IPV6; 510 inp->inp_inc.inc_flags |= INC_ISIPV6; 511 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 512 goto out; 513 if ((error = tcp6_connect(tp, nam, td)) != 0) 514 goto out; 515 error = tcp_output_connect(so, nam); 516 517 out: 518 TCPDEBUG2(PRU_CONNECT); 519 INP_WUNLOCK(inp); 520 INP_INFO_WUNLOCK(&V_tcbinfo); 521 return (error); 522 } 523 #endif /* INET6 */ 524 525 /* 526 * Initiate disconnect from peer. 527 * If connection never passed embryonic stage, just drop; 528 * else if don't need to let data drain, then can just drop anyways, 529 * else have to begin TCP shutdown process: mark socket disconnecting, 530 * drain unread data, state switch to reflect user close, and 531 * send segment (e.g. FIN) to peer. Socket will be really disconnected 532 * when peer sends FIN and acks ours. 533 * 534 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 535 */ 536 static int 537 tcp_usr_disconnect(struct socket *so) 538 { 539 struct inpcb *inp; 540 struct tcpcb *tp = NULL; 541 int error = 0; 542 543 TCPDEBUG0; 544 INP_INFO_WLOCK(&V_tcbinfo); 545 inp = sotoinpcb(so); 546 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 547 INP_WLOCK(inp); 548 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 549 error = ECONNRESET; 550 goto out; 551 } 552 tp = intotcpcb(inp); 553 TCPDEBUG1(); 554 tcp_disconnect(tp); 555 out: 556 TCPDEBUG2(PRU_DISCONNECT); 557 INP_WUNLOCK(inp); 558 INP_INFO_WUNLOCK(&V_tcbinfo); 559 return (error); 560 } 561 562 /* 563 * Accept a connection. Essentially all the work is done at higher levels; 564 * just return the address of the peer, storing through addr. 565 * 566 * The rationale for acquiring the tcbinfo lock here is somewhat complicated, 567 * and is described in detail in the commit log entry for r175612. Acquiring 568 * it delays an accept(2) racing with sonewconn(), which inserts the socket 569 * before the inpcb address/port fields are initialized. A better fix would 570 * prevent the socket from being placed in the listen queue until all fields 571 * are fully initialized. 572 */ 573 static int 574 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 575 { 576 int error = 0; 577 struct inpcb *inp = NULL; 578 struct tcpcb *tp = NULL; 579 struct in_addr addr; 580 in_port_t port = 0; 581 TCPDEBUG0; 582 583 if (so->so_state & SS_ISDISCONNECTED) 584 return (ECONNABORTED); 585 586 inp = sotoinpcb(so); 587 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 588 INP_INFO_RLOCK(&V_tcbinfo); 589 INP_WLOCK(inp); 590 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 591 error = ECONNABORTED; 592 goto out; 593 } 594 tp = intotcpcb(inp); 595 TCPDEBUG1(); 596 597 /* 598 * We inline in_getpeeraddr and COMMON_END here, so that we can 599 * copy the data of interest and defer the malloc until after we 600 * release the lock. 601 */ 602 port = inp->inp_fport; 603 addr = inp->inp_faddr; 604 605 out: 606 TCPDEBUG2(PRU_ACCEPT); 607 INP_WUNLOCK(inp); 608 INP_INFO_RUNLOCK(&V_tcbinfo); 609 if (error == 0) 610 *nam = in_sockaddr(port, &addr); 611 return error; 612 } 613 614 #ifdef INET6 615 static int 616 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 617 { 618 struct inpcb *inp = NULL; 619 int error = 0; 620 struct tcpcb *tp = NULL; 621 struct in_addr addr; 622 struct in6_addr addr6; 623 in_port_t port = 0; 624 int v4 = 0; 625 TCPDEBUG0; 626 627 if (so->so_state & SS_ISDISCONNECTED) 628 return (ECONNABORTED); 629 630 inp = sotoinpcb(so); 631 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 632 INP_WLOCK(inp); 633 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 634 error = ECONNABORTED; 635 goto out; 636 } 637 tp = intotcpcb(inp); 638 TCPDEBUG1(); 639 640 /* 641 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 642 * copy the data of interest and defer the malloc until after we 643 * release the lock. 644 */ 645 if (inp->inp_vflag & INP_IPV4) { 646 v4 = 1; 647 port = inp->inp_fport; 648 addr = inp->inp_faddr; 649 } else { 650 port = inp->inp_fport; 651 addr6 = inp->in6p_faddr; 652 } 653 654 out: 655 TCPDEBUG2(PRU_ACCEPT); 656 INP_WUNLOCK(inp); 657 if (error == 0) { 658 if (v4) 659 *nam = in6_v4mapsin6_sockaddr(port, &addr); 660 else 661 *nam = in6_sockaddr(port, &addr6); 662 } 663 return error; 664 } 665 #endif /* INET6 */ 666 667 /* 668 * Mark the connection as being incapable of further output. 669 */ 670 static int 671 tcp_usr_shutdown(struct socket *so) 672 { 673 int error = 0; 674 struct inpcb *inp; 675 struct tcpcb *tp = NULL; 676 677 TCPDEBUG0; 678 INP_INFO_WLOCK(&V_tcbinfo); 679 inp = sotoinpcb(so); 680 KASSERT(inp != NULL, ("inp == NULL")); 681 INP_WLOCK(inp); 682 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 683 error = ECONNRESET; 684 goto out; 685 } 686 tp = intotcpcb(inp); 687 TCPDEBUG1(); 688 socantsendmore(so); 689 tcp_usrclosed(tp); 690 if (!(inp->inp_flags & INP_DROPPED)) 691 error = tcp_output_disconnect(tp); 692 693 out: 694 TCPDEBUG2(PRU_SHUTDOWN); 695 INP_WUNLOCK(inp); 696 INP_INFO_WUNLOCK(&V_tcbinfo); 697 698 return (error); 699 } 700 701 /* 702 * After a receive, possibly send window update to peer. 703 */ 704 static int 705 tcp_usr_rcvd(struct socket *so, int flags) 706 { 707 struct inpcb *inp; 708 struct tcpcb *tp = NULL; 709 int error = 0; 710 711 TCPDEBUG0; 712 inp = sotoinpcb(so); 713 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 714 INP_WLOCK(inp); 715 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 716 error = ECONNRESET; 717 goto out; 718 } 719 tp = intotcpcb(inp); 720 TCPDEBUG1(); 721 tcp_output_rcvd(tp); 722 723 out: 724 TCPDEBUG2(PRU_RCVD); 725 INP_WUNLOCK(inp); 726 return (error); 727 } 728 729 /* 730 * Do a send by putting data in output queue and updating urgent 731 * marker if URG set. Possibly send more data. Unlike the other 732 * pru_*() routines, the mbuf chains are our responsibility. We 733 * must either enqueue them or free them. The other pru_* routines 734 * generally are caller-frees. 735 */ 736 static int 737 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 738 struct sockaddr *nam, struct mbuf *control, struct thread *td) 739 { 740 int error = 0; 741 struct inpcb *inp; 742 struct tcpcb *tp = NULL; 743 int headlocked = 0; 744 #ifdef INET6 745 int isipv6; 746 #endif 747 TCPDEBUG0; 748 749 /* 750 * We require the pcbinfo lock in two cases: 751 * 752 * (1) An implied connect is taking place, which can result in 753 * binding IPs and ports and hence modification of the pcb hash 754 * chains. 755 * 756 * (2) PRUS_EOF is set, resulting in explicit close on the send. 757 */ 758 if ((nam != NULL) || (flags & PRUS_EOF)) { 759 INP_INFO_WLOCK(&V_tcbinfo); 760 headlocked = 1; 761 } 762 inp = sotoinpcb(so); 763 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 764 INP_WLOCK(inp); 765 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 766 if (control) 767 m_freem(control); 768 if (m) 769 m_freem(m); 770 error = ECONNRESET; 771 goto out; 772 } 773 #ifdef INET6 774 isipv6 = nam && nam->sa_family == AF_INET6; 775 #endif /* INET6 */ 776 tp = intotcpcb(inp); 777 TCPDEBUG1(); 778 if (control) { 779 /* TCP doesn't do control messages (rights, creds, etc) */ 780 if (control->m_len) { 781 m_freem(control); 782 if (m) 783 m_freem(m); 784 error = EINVAL; 785 goto out; 786 } 787 m_freem(control); /* empty control, just free it */ 788 } 789 if (!(flags & PRUS_OOB)) { 790 sbappendstream(&so->so_snd, m); 791 if (nam && tp->t_state < TCPS_SYN_SENT) { 792 /* 793 * Do implied connect if not yet connected, 794 * initialize window to default value, and 795 * initialize maxseg/maxopd using peer's cached 796 * MSS. 797 */ 798 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 799 #ifdef INET6 800 if (isipv6) 801 error = tcp6_connect(tp, nam, td); 802 else 803 #endif /* INET6 */ 804 error = tcp_connect(tp, nam, td); 805 if (error) 806 goto out; 807 tp->snd_wnd = TTCP_CLIENT_SND_WND; 808 tcp_mss(tp, -1); 809 } 810 if (flags & PRUS_EOF) { 811 /* 812 * Close the send side of the connection after 813 * the data is sent. 814 */ 815 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 816 socantsendmore(so); 817 tcp_usrclosed(tp); 818 } 819 if (headlocked) { 820 INP_INFO_WUNLOCK(&V_tcbinfo); 821 headlocked = 0; 822 } 823 if (!(inp->inp_flags & INP_DROPPED)) { 824 if (flags & PRUS_MORETOCOME) 825 tp->t_flags |= TF_MORETOCOME; 826 error = tcp_output_send(tp); 827 if (flags & PRUS_MORETOCOME) 828 tp->t_flags &= ~TF_MORETOCOME; 829 } 830 } else { 831 /* 832 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 833 */ 834 SOCKBUF_LOCK(&so->so_snd); 835 if (sbspace(&so->so_snd) < -512) { 836 SOCKBUF_UNLOCK(&so->so_snd); 837 m_freem(m); 838 error = ENOBUFS; 839 goto out; 840 } 841 /* 842 * According to RFC961 (Assigned Protocols), 843 * the urgent pointer points to the last octet 844 * of urgent data. We continue, however, 845 * to consider it to indicate the first octet 846 * of data past the urgent section. 847 * Otherwise, snd_up should be one lower. 848 */ 849 sbappendstream_locked(&so->so_snd, m); 850 SOCKBUF_UNLOCK(&so->so_snd); 851 if (nam && tp->t_state < TCPS_SYN_SENT) { 852 /* 853 * Do implied connect if not yet connected, 854 * initialize window to default value, and 855 * initialize maxseg/maxopd using peer's cached 856 * MSS. 857 */ 858 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 859 #ifdef INET6 860 if (isipv6) 861 error = tcp6_connect(tp, nam, td); 862 else 863 #endif /* INET6 */ 864 error = tcp_connect(tp, nam, td); 865 if (error) 866 goto out; 867 tp->snd_wnd = TTCP_CLIENT_SND_WND; 868 tcp_mss(tp, -1); 869 INP_INFO_WUNLOCK(&V_tcbinfo); 870 headlocked = 0; 871 } else if (nam) { 872 INP_INFO_WUNLOCK(&V_tcbinfo); 873 headlocked = 0; 874 } 875 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 876 tp->t_flags |= TF_FORCEDATA; 877 error = tcp_output_send(tp); 878 tp->t_flags &= ~TF_FORCEDATA; 879 } 880 out: 881 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 882 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 883 INP_WUNLOCK(inp); 884 if (headlocked) 885 INP_INFO_WUNLOCK(&V_tcbinfo); 886 return (error); 887 } 888 889 /* 890 * Abort the TCP. Drop the connection abruptly. 891 */ 892 static void 893 tcp_usr_abort(struct socket *so) 894 { 895 struct inpcb *inp; 896 struct tcpcb *tp = NULL; 897 TCPDEBUG0; 898 899 inp = sotoinpcb(so); 900 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 901 902 INP_INFO_WLOCK(&V_tcbinfo); 903 INP_WLOCK(inp); 904 KASSERT(inp->inp_socket != NULL, 905 ("tcp_usr_abort: inp_socket == NULL")); 906 907 /* 908 * If we still have full TCP state, and we're not dropped, drop. 909 */ 910 if (!(inp->inp_flags & INP_TIMEWAIT) && 911 !(inp->inp_flags & INP_DROPPED)) { 912 tp = intotcpcb(inp); 913 TCPDEBUG1(); 914 tcp_drop(tp, ECONNABORTED); 915 TCPDEBUG2(PRU_ABORT); 916 } 917 if (!(inp->inp_flags & INP_DROPPED)) { 918 SOCK_LOCK(so); 919 so->so_state |= SS_PROTOREF; 920 SOCK_UNLOCK(so); 921 inp->inp_flags |= INP_SOCKREF; 922 } 923 INP_WUNLOCK(inp); 924 INP_INFO_WUNLOCK(&V_tcbinfo); 925 } 926 927 /* 928 * TCP socket is closed. Start friendly disconnect. 929 */ 930 static void 931 tcp_usr_close(struct socket *so) 932 { 933 struct inpcb *inp; 934 struct tcpcb *tp = NULL; 935 TCPDEBUG0; 936 937 inp = sotoinpcb(so); 938 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 939 940 INP_INFO_WLOCK(&V_tcbinfo); 941 INP_WLOCK(inp); 942 KASSERT(inp->inp_socket != NULL, 943 ("tcp_usr_close: inp_socket == NULL")); 944 945 /* 946 * If we still have full TCP state, and we're not dropped, initiate 947 * a disconnect. 948 */ 949 if (!(inp->inp_flags & INP_TIMEWAIT) && 950 !(inp->inp_flags & INP_DROPPED)) { 951 tp = intotcpcb(inp); 952 TCPDEBUG1(); 953 tcp_disconnect(tp); 954 TCPDEBUG2(PRU_CLOSE); 955 } 956 if (!(inp->inp_flags & INP_DROPPED)) { 957 SOCK_LOCK(so); 958 so->so_state |= SS_PROTOREF; 959 SOCK_UNLOCK(so); 960 inp->inp_flags |= INP_SOCKREF; 961 } 962 INP_WUNLOCK(inp); 963 INP_INFO_WUNLOCK(&V_tcbinfo); 964 } 965 966 /* 967 * Receive out-of-band data. 968 */ 969 static int 970 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 971 { 972 int error = 0; 973 struct inpcb *inp; 974 struct tcpcb *tp = NULL; 975 976 TCPDEBUG0; 977 inp = sotoinpcb(so); 978 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 979 INP_WLOCK(inp); 980 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 981 error = ECONNRESET; 982 goto out; 983 } 984 tp = intotcpcb(inp); 985 TCPDEBUG1(); 986 if ((so->so_oobmark == 0 && 987 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 988 so->so_options & SO_OOBINLINE || 989 tp->t_oobflags & TCPOOB_HADDATA) { 990 error = EINVAL; 991 goto out; 992 } 993 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 994 error = EWOULDBLOCK; 995 goto out; 996 } 997 m->m_len = 1; 998 *mtod(m, caddr_t) = tp->t_iobc; 999 if ((flags & MSG_PEEK) == 0) 1000 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1001 1002 out: 1003 TCPDEBUG2(PRU_RCVOOB); 1004 INP_WUNLOCK(inp); 1005 return (error); 1006 } 1007 1008 struct pr_usrreqs tcp_usrreqs = { 1009 .pru_abort = tcp_usr_abort, 1010 .pru_accept = tcp_usr_accept, 1011 .pru_attach = tcp_usr_attach, 1012 .pru_bind = tcp_usr_bind, 1013 .pru_connect = tcp_usr_connect, 1014 .pru_control = in_control, 1015 .pru_detach = tcp_usr_detach, 1016 .pru_disconnect = tcp_usr_disconnect, 1017 .pru_listen = tcp_usr_listen, 1018 .pru_peeraddr = in_getpeeraddr, 1019 .pru_rcvd = tcp_usr_rcvd, 1020 .pru_rcvoob = tcp_usr_rcvoob, 1021 .pru_send = tcp_usr_send, 1022 .pru_shutdown = tcp_usr_shutdown, 1023 .pru_sockaddr = in_getsockaddr, 1024 #if 0 1025 .pru_soreceive = soreceive_stream, 1026 #endif 1027 .pru_sosetlabel = in_pcbsosetlabel, 1028 .pru_close = tcp_usr_close, 1029 }; 1030 1031 #ifdef INET6 1032 struct pr_usrreqs tcp6_usrreqs = { 1033 .pru_abort = tcp_usr_abort, 1034 .pru_accept = tcp6_usr_accept, 1035 .pru_attach = tcp_usr_attach, 1036 .pru_bind = tcp6_usr_bind, 1037 .pru_connect = tcp6_usr_connect, 1038 .pru_control = in6_control, 1039 .pru_detach = tcp_usr_detach, 1040 .pru_disconnect = tcp_usr_disconnect, 1041 .pru_listen = tcp6_usr_listen, 1042 .pru_peeraddr = in6_mapped_peeraddr, 1043 .pru_rcvd = tcp_usr_rcvd, 1044 .pru_rcvoob = tcp_usr_rcvoob, 1045 .pru_send = tcp_usr_send, 1046 .pru_shutdown = tcp_usr_shutdown, 1047 .pru_sockaddr = in6_mapped_sockaddr, 1048 #if 0 1049 .pru_soreceive = soreceive_stream, 1050 #endif 1051 .pru_sosetlabel = in_pcbsosetlabel, 1052 .pru_close = tcp_usr_close, 1053 }; 1054 #endif /* INET6 */ 1055 1056 /* 1057 * Common subroutine to open a TCP connection to remote host specified 1058 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1059 * port number if needed. Call in_pcbconnect_setup to do the routing and 1060 * to choose a local host address (interface). If there is an existing 1061 * incarnation of the same connection in TIME-WAIT state and if the remote 1062 * host was sending CC options and if the connection duration was < MSL, then 1063 * truncate the previous TIME-WAIT state and proceed. 1064 * Initialize connection parameters and enter SYN-SENT state. 1065 */ 1066 static int 1067 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1068 { 1069 struct inpcb *inp = tp->t_inpcb, *oinp; 1070 struct socket *so = inp->inp_socket; 1071 struct in_addr laddr; 1072 u_short lport; 1073 int error; 1074 1075 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1076 INP_WLOCK_ASSERT(inp); 1077 1078 if (inp->inp_lport == 0) { 1079 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1080 if (error) 1081 return error; 1082 } 1083 1084 /* 1085 * Cannot simply call in_pcbconnect, because there might be an 1086 * earlier incarnation of this same connection still in 1087 * TIME_WAIT state, creating an ADDRINUSE error. 1088 */ 1089 laddr = inp->inp_laddr; 1090 lport = inp->inp_lport; 1091 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1092 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1093 if (error && oinp == NULL) 1094 return error; 1095 if (oinp) 1096 return EADDRINUSE; 1097 inp->inp_laddr = laddr; 1098 in_pcbrehash(inp); 1099 1100 /* 1101 * Compute window scaling to request: 1102 * Scale to fit into sweet spot. See tcp_syncache.c. 1103 * XXX: This should move to tcp_output(). 1104 */ 1105 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1106 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1107 tp->request_r_scale++; 1108 1109 soisconnecting(so); 1110 TCPSTAT_INC(tcps_connattempt); 1111 tp->t_state = TCPS_SYN_SENT; 1112 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit); 1113 tp->iss = tcp_new_isn(tp); 1114 tp->t_bw_rtseq = tp->iss; 1115 tcp_sendseqinit(tp); 1116 1117 return 0; 1118 } 1119 1120 #ifdef INET6 1121 static int 1122 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1123 { 1124 struct inpcb *inp = tp->t_inpcb, *oinp; 1125 struct socket *so = inp->inp_socket; 1126 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1127 struct in6_addr addr6; 1128 int error; 1129 1130 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1131 INP_WLOCK_ASSERT(inp); 1132 1133 if (inp->inp_lport == 0) { 1134 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1135 if (error) 1136 return error; 1137 } 1138 1139 /* 1140 * Cannot simply call in_pcbconnect, because there might be an 1141 * earlier incarnation of this same connection still in 1142 * TIME_WAIT state, creating an ADDRINUSE error. 1143 * in6_pcbladdr() also handles scope zone IDs. 1144 */ 1145 error = in6_pcbladdr(inp, nam, &addr6); 1146 if (error) 1147 return error; 1148 oinp = in6_pcblookup_hash(inp->inp_pcbinfo, 1149 &sin6->sin6_addr, sin6->sin6_port, 1150 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 1151 ? &addr6 1152 : &inp->in6p_laddr, 1153 inp->inp_lport, 0, NULL); 1154 if (oinp) 1155 return EADDRINUSE; 1156 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1157 inp->in6p_laddr = addr6; 1158 inp->in6p_faddr = sin6->sin6_addr; 1159 inp->inp_fport = sin6->sin6_port; 1160 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 1161 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 1162 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 1163 inp->inp_flow |= 1164 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 1165 in_pcbrehash(inp); 1166 1167 /* Compute window scaling to request. */ 1168 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1169 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1170 tp->request_r_scale++; 1171 1172 soisconnecting(so); 1173 TCPSTAT_INC(tcps_connattempt); 1174 tp->t_state = TCPS_SYN_SENT; 1175 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit); 1176 tp->iss = tcp_new_isn(tp); 1177 tp->t_bw_rtseq = tp->iss; 1178 tcp_sendseqinit(tp); 1179 1180 return 0; 1181 } 1182 #endif /* INET6 */ 1183 1184 /* 1185 * Export TCP internal state information via a struct tcp_info, based on the 1186 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1187 * (TCP state machine, etc). We export all information using FreeBSD-native 1188 * constants -- for example, the numeric values for tcpi_state will differ 1189 * from Linux. 1190 */ 1191 static void 1192 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1193 { 1194 1195 INP_WLOCK_ASSERT(tp->t_inpcb); 1196 bzero(ti, sizeof(*ti)); 1197 1198 ti->tcpi_state = tp->t_state; 1199 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1200 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1201 if (tp->t_flags & TF_SACK_PERMIT) 1202 ti->tcpi_options |= TCPI_OPT_SACK; 1203 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1204 ti->tcpi_options |= TCPI_OPT_WSCALE; 1205 ti->tcpi_snd_wscale = tp->snd_scale; 1206 ti->tcpi_rcv_wscale = tp->rcv_scale; 1207 } 1208 1209 ti->tcpi_rto = tp->t_rxtcur * tick; 1210 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1211 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1212 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1213 1214 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1215 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1216 1217 /* 1218 * FreeBSD-specific extension fields for tcp_info. 1219 */ 1220 ti->tcpi_rcv_space = tp->rcv_wnd; 1221 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1222 ti->tcpi_snd_wnd = tp->snd_wnd; 1223 ti->tcpi_snd_bwnd = tp->snd_bwnd; 1224 ti->tcpi_snd_nxt = tp->snd_nxt; 1225 ti->tcpi_snd_mss = tp->t_maxseg; 1226 ti->tcpi_rcv_mss = tp->t_maxseg; 1227 if (tp->t_flags & TF_TOE) 1228 ti->tcpi_options |= TCPI_OPT_TOE; 1229 } 1230 1231 /* 1232 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1233 * socket option arguments. When it re-acquires the lock after the copy, it 1234 * has to revalidate that the connection is still valid for the socket 1235 * option. 1236 */ 1237 #define INP_WLOCK_RECHECK(inp) do { \ 1238 INP_WLOCK(inp); \ 1239 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1240 INP_WUNLOCK(inp); \ 1241 return (ECONNRESET); \ 1242 } \ 1243 tp = intotcpcb(inp); \ 1244 } while(0) 1245 1246 int 1247 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1248 { 1249 int error, opt, optval; 1250 struct inpcb *inp; 1251 struct tcpcb *tp; 1252 struct tcp_info ti; 1253 1254 error = 0; 1255 inp = sotoinpcb(so); 1256 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1257 INP_WLOCK(inp); 1258 if (sopt->sopt_level != IPPROTO_TCP) { 1259 #ifdef INET6 1260 if (inp->inp_vflag & INP_IPV6PROTO) { 1261 INP_WUNLOCK(inp); 1262 error = ip6_ctloutput(so, sopt); 1263 } else { 1264 #endif /* INET6 */ 1265 INP_WUNLOCK(inp); 1266 error = ip_ctloutput(so, sopt); 1267 #ifdef INET6 1268 } 1269 #endif 1270 return (error); 1271 } 1272 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1273 INP_WUNLOCK(inp); 1274 return (ECONNRESET); 1275 } 1276 1277 switch (sopt->sopt_dir) { 1278 case SOPT_SET: 1279 switch (sopt->sopt_name) { 1280 #ifdef TCP_SIGNATURE 1281 case TCP_MD5SIG: 1282 INP_WUNLOCK(inp); 1283 error = sooptcopyin(sopt, &optval, sizeof optval, 1284 sizeof optval); 1285 if (error) 1286 return (error); 1287 1288 INP_WLOCK_RECHECK(inp); 1289 if (optval > 0) 1290 tp->t_flags |= TF_SIGNATURE; 1291 else 1292 tp->t_flags &= ~TF_SIGNATURE; 1293 INP_WUNLOCK(inp); 1294 break; 1295 #endif /* TCP_SIGNATURE */ 1296 case TCP_NODELAY: 1297 case TCP_NOOPT: 1298 INP_WUNLOCK(inp); 1299 error = sooptcopyin(sopt, &optval, sizeof optval, 1300 sizeof optval); 1301 if (error) 1302 return (error); 1303 1304 INP_WLOCK_RECHECK(inp); 1305 switch (sopt->sopt_name) { 1306 case TCP_NODELAY: 1307 opt = TF_NODELAY; 1308 break; 1309 case TCP_NOOPT: 1310 opt = TF_NOOPT; 1311 break; 1312 default: 1313 opt = 0; /* dead code to fool gcc */ 1314 break; 1315 } 1316 1317 if (optval) 1318 tp->t_flags |= opt; 1319 else 1320 tp->t_flags &= ~opt; 1321 INP_WUNLOCK(inp); 1322 break; 1323 1324 case TCP_NOPUSH: 1325 INP_WUNLOCK(inp); 1326 error = sooptcopyin(sopt, &optval, sizeof optval, 1327 sizeof optval); 1328 if (error) 1329 return (error); 1330 1331 INP_WLOCK_RECHECK(inp); 1332 if (optval) 1333 tp->t_flags |= TF_NOPUSH; 1334 else if (tp->t_flags & TF_NOPUSH) { 1335 tp->t_flags &= ~TF_NOPUSH; 1336 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1337 error = tcp_output(tp); 1338 } 1339 INP_WUNLOCK(inp); 1340 break; 1341 1342 case TCP_MAXSEG: 1343 INP_WUNLOCK(inp); 1344 error = sooptcopyin(sopt, &optval, sizeof optval, 1345 sizeof optval); 1346 if (error) 1347 return (error); 1348 1349 INP_WLOCK_RECHECK(inp); 1350 if (optval > 0 && optval <= tp->t_maxseg && 1351 optval + 40 >= V_tcp_minmss) 1352 tp->t_maxseg = optval; 1353 else 1354 error = EINVAL; 1355 INP_WUNLOCK(inp); 1356 break; 1357 1358 case TCP_INFO: 1359 INP_WUNLOCK(inp); 1360 error = EINVAL; 1361 break; 1362 1363 default: 1364 INP_WUNLOCK(inp); 1365 error = ENOPROTOOPT; 1366 break; 1367 } 1368 break; 1369 1370 case SOPT_GET: 1371 tp = intotcpcb(inp); 1372 switch (sopt->sopt_name) { 1373 #ifdef TCP_SIGNATURE 1374 case TCP_MD5SIG: 1375 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1376 INP_WUNLOCK(inp); 1377 error = sooptcopyout(sopt, &optval, sizeof optval); 1378 break; 1379 #endif 1380 1381 case TCP_NODELAY: 1382 optval = tp->t_flags & TF_NODELAY; 1383 INP_WUNLOCK(inp); 1384 error = sooptcopyout(sopt, &optval, sizeof optval); 1385 break; 1386 case TCP_MAXSEG: 1387 optval = tp->t_maxseg; 1388 INP_WUNLOCK(inp); 1389 error = sooptcopyout(sopt, &optval, sizeof optval); 1390 break; 1391 case TCP_NOOPT: 1392 optval = tp->t_flags & TF_NOOPT; 1393 INP_WUNLOCK(inp); 1394 error = sooptcopyout(sopt, &optval, sizeof optval); 1395 break; 1396 case TCP_NOPUSH: 1397 optval = tp->t_flags & TF_NOPUSH; 1398 INP_WUNLOCK(inp); 1399 error = sooptcopyout(sopt, &optval, sizeof optval); 1400 break; 1401 case TCP_INFO: 1402 tcp_fill_info(tp, &ti); 1403 INP_WUNLOCK(inp); 1404 error = sooptcopyout(sopt, &ti, sizeof ti); 1405 break; 1406 default: 1407 INP_WUNLOCK(inp); 1408 error = ENOPROTOOPT; 1409 break; 1410 } 1411 break; 1412 } 1413 return (error); 1414 } 1415 #undef INP_WLOCK_RECHECK 1416 1417 /* 1418 * tcp_sendspace and tcp_recvspace are the default send and receive window 1419 * sizes, respectively. These are obsolescent (this information should 1420 * be set by the route). 1421 */ 1422 u_long tcp_sendspace = 1024*32; 1423 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1424 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1425 u_long tcp_recvspace = 1024*64; 1426 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1427 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1428 1429 /* 1430 * Attach TCP protocol to socket, allocating 1431 * internet protocol control block, tcp control block, 1432 * bufer space, and entering LISTEN state if to accept connections. 1433 */ 1434 static int 1435 tcp_attach(struct socket *so) 1436 { 1437 struct tcpcb *tp; 1438 struct inpcb *inp; 1439 int error; 1440 1441 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1442 error = soreserve(so, tcp_sendspace, tcp_recvspace); 1443 if (error) 1444 return (error); 1445 } 1446 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1447 so->so_snd.sb_flags |= SB_AUTOSIZE; 1448 INP_INFO_WLOCK(&V_tcbinfo); 1449 error = in_pcballoc(so, &V_tcbinfo); 1450 if (error) { 1451 INP_INFO_WUNLOCK(&V_tcbinfo); 1452 return (error); 1453 } 1454 inp = sotoinpcb(so); 1455 #ifdef INET6 1456 if (inp->inp_vflag & INP_IPV6PROTO) { 1457 inp->inp_vflag |= INP_IPV6; 1458 inp->in6p_hops = -1; /* use kernel default */ 1459 } 1460 else 1461 #endif 1462 inp->inp_vflag |= INP_IPV4; 1463 tp = tcp_newtcpcb(inp); 1464 if (tp == NULL) { 1465 in_pcbdetach(inp); 1466 in_pcbfree(inp); 1467 INP_INFO_WUNLOCK(&V_tcbinfo); 1468 return (ENOBUFS); 1469 } 1470 tp->t_state = TCPS_CLOSED; 1471 INP_WUNLOCK(inp); 1472 INP_INFO_WUNLOCK(&V_tcbinfo); 1473 return (0); 1474 } 1475 1476 /* 1477 * Initiate (or continue) disconnect. 1478 * If embryonic state, just send reset (once). 1479 * If in ``let data drain'' option and linger null, just drop. 1480 * Otherwise (hard), mark socket disconnecting and drop 1481 * current input data; switch states based on user close, and 1482 * send segment to peer (with FIN). 1483 */ 1484 static void 1485 tcp_disconnect(struct tcpcb *tp) 1486 { 1487 struct inpcb *inp = tp->t_inpcb; 1488 struct socket *so = inp->inp_socket; 1489 1490 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1491 INP_WLOCK_ASSERT(inp); 1492 1493 /* 1494 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1495 * socket is still open. 1496 */ 1497 if (tp->t_state < TCPS_ESTABLISHED) { 1498 tp = tcp_close(tp); 1499 KASSERT(tp != NULL, 1500 ("tcp_disconnect: tcp_close() returned NULL")); 1501 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1502 tp = tcp_drop(tp, 0); 1503 KASSERT(tp != NULL, 1504 ("tcp_disconnect: tcp_drop() returned NULL")); 1505 } else { 1506 soisdisconnecting(so); 1507 sbflush(&so->so_rcv); 1508 tcp_usrclosed(tp); 1509 if (!(inp->inp_flags & INP_DROPPED)) 1510 tcp_output_disconnect(tp); 1511 } 1512 } 1513 1514 /* 1515 * User issued close, and wish to trail through shutdown states: 1516 * if never received SYN, just forget it. If got a SYN from peer, 1517 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1518 * If already got a FIN from peer, then almost done; go to LAST_ACK 1519 * state. In all other cases, have already sent FIN to peer (e.g. 1520 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1521 * for peer to send FIN or not respond to keep-alives, etc. 1522 * We can let the user exit from the close as soon as the FIN is acked. 1523 */ 1524 static void 1525 tcp_usrclosed(struct tcpcb *tp) 1526 { 1527 1528 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1529 INP_WLOCK_ASSERT(tp->t_inpcb); 1530 1531 switch (tp->t_state) { 1532 case TCPS_LISTEN: 1533 tcp_offload_listen_close(tp); 1534 /* FALLTHROUGH */ 1535 case TCPS_CLOSED: 1536 tp->t_state = TCPS_CLOSED; 1537 tp = tcp_close(tp); 1538 /* 1539 * tcp_close() should never return NULL here as the socket is 1540 * still open. 1541 */ 1542 KASSERT(tp != NULL, 1543 ("tcp_usrclosed: tcp_close() returned NULL")); 1544 break; 1545 1546 case TCPS_SYN_SENT: 1547 case TCPS_SYN_RECEIVED: 1548 tp->t_flags |= TF_NEEDFIN; 1549 break; 1550 1551 case TCPS_ESTABLISHED: 1552 tp->t_state = TCPS_FIN_WAIT_1; 1553 break; 1554 1555 case TCPS_CLOSE_WAIT: 1556 tp->t_state = TCPS_LAST_ACK; 1557 break; 1558 } 1559 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1560 soisdisconnected(tp->t_inpcb->inp_socket); 1561 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1562 if (tp->t_state == TCPS_FIN_WAIT_2) { 1563 int timeout; 1564 1565 timeout = (tcp_fast_finwait2_recycle) ? 1566 tcp_finwait2_timeout : tcp_maxidle; 1567 tcp_timer_activate(tp, TT_2MSL, timeout); 1568 } 1569 } 1570 } 1571 1572 #ifdef DDB 1573 static void 1574 db_print_indent(int indent) 1575 { 1576 int i; 1577 1578 for (i = 0; i < indent; i++) 1579 db_printf(" "); 1580 } 1581 1582 static void 1583 db_print_tstate(int t_state) 1584 { 1585 1586 switch (t_state) { 1587 case TCPS_CLOSED: 1588 db_printf("TCPS_CLOSED"); 1589 return; 1590 1591 case TCPS_LISTEN: 1592 db_printf("TCPS_LISTEN"); 1593 return; 1594 1595 case TCPS_SYN_SENT: 1596 db_printf("TCPS_SYN_SENT"); 1597 return; 1598 1599 case TCPS_SYN_RECEIVED: 1600 db_printf("TCPS_SYN_RECEIVED"); 1601 return; 1602 1603 case TCPS_ESTABLISHED: 1604 db_printf("TCPS_ESTABLISHED"); 1605 return; 1606 1607 case TCPS_CLOSE_WAIT: 1608 db_printf("TCPS_CLOSE_WAIT"); 1609 return; 1610 1611 case TCPS_FIN_WAIT_1: 1612 db_printf("TCPS_FIN_WAIT_1"); 1613 return; 1614 1615 case TCPS_CLOSING: 1616 db_printf("TCPS_CLOSING"); 1617 return; 1618 1619 case TCPS_LAST_ACK: 1620 db_printf("TCPS_LAST_ACK"); 1621 return; 1622 1623 case TCPS_FIN_WAIT_2: 1624 db_printf("TCPS_FIN_WAIT_2"); 1625 return; 1626 1627 case TCPS_TIME_WAIT: 1628 db_printf("TCPS_TIME_WAIT"); 1629 return; 1630 1631 default: 1632 db_printf("unknown"); 1633 return; 1634 } 1635 } 1636 1637 static void 1638 db_print_tflags(u_int t_flags) 1639 { 1640 int comma; 1641 1642 comma = 0; 1643 if (t_flags & TF_ACKNOW) { 1644 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 1645 comma = 1; 1646 } 1647 if (t_flags & TF_DELACK) { 1648 db_printf("%sTF_DELACK", comma ? ", " : ""); 1649 comma = 1; 1650 } 1651 if (t_flags & TF_NODELAY) { 1652 db_printf("%sTF_NODELAY", comma ? ", " : ""); 1653 comma = 1; 1654 } 1655 if (t_flags & TF_NOOPT) { 1656 db_printf("%sTF_NOOPT", comma ? ", " : ""); 1657 comma = 1; 1658 } 1659 if (t_flags & TF_SENTFIN) { 1660 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 1661 comma = 1; 1662 } 1663 if (t_flags & TF_REQ_SCALE) { 1664 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 1665 comma = 1; 1666 } 1667 if (t_flags & TF_RCVD_SCALE) { 1668 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 1669 comma = 1; 1670 } 1671 if (t_flags & TF_REQ_TSTMP) { 1672 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 1673 comma = 1; 1674 } 1675 if (t_flags & TF_RCVD_TSTMP) { 1676 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 1677 comma = 1; 1678 } 1679 if (t_flags & TF_SACK_PERMIT) { 1680 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 1681 comma = 1; 1682 } 1683 if (t_flags & TF_NEEDSYN) { 1684 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 1685 comma = 1; 1686 } 1687 if (t_flags & TF_NEEDFIN) { 1688 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 1689 comma = 1; 1690 } 1691 if (t_flags & TF_NOPUSH) { 1692 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1693 comma = 1; 1694 } 1695 if (t_flags & TF_NOPUSH) { 1696 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1697 comma = 1; 1698 } 1699 if (t_flags & TF_MORETOCOME) { 1700 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 1701 comma = 1; 1702 } 1703 if (t_flags & TF_LQ_OVERFLOW) { 1704 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 1705 comma = 1; 1706 } 1707 if (t_flags & TF_LASTIDLE) { 1708 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 1709 comma = 1; 1710 } 1711 if (t_flags & TF_RXWIN0SENT) { 1712 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 1713 comma = 1; 1714 } 1715 if (t_flags & TF_FASTRECOVERY) { 1716 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 1717 comma = 1; 1718 } 1719 if (t_flags & TF_WASFRECOVERY) { 1720 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 1721 comma = 1; 1722 } 1723 if (t_flags & TF_SIGNATURE) { 1724 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 1725 comma = 1; 1726 } 1727 if (t_flags & TF_FORCEDATA) { 1728 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 1729 comma = 1; 1730 } 1731 if (t_flags & TF_TSO) { 1732 db_printf("%sTF_TSO", comma ? ", " : ""); 1733 comma = 1; 1734 } 1735 if (t_flags & TF_ECN_PERMIT) { 1736 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 1737 comma = 1; 1738 } 1739 } 1740 1741 static void 1742 db_print_toobflags(char t_oobflags) 1743 { 1744 int comma; 1745 1746 comma = 0; 1747 if (t_oobflags & TCPOOB_HAVEDATA) { 1748 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 1749 comma = 1; 1750 } 1751 if (t_oobflags & TCPOOB_HADDATA) { 1752 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 1753 comma = 1; 1754 } 1755 } 1756 1757 static void 1758 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 1759 { 1760 1761 db_print_indent(indent); 1762 db_printf("%s at %p\n", name, tp); 1763 1764 indent += 2; 1765 1766 db_print_indent(indent); 1767 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 1768 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 1769 1770 db_print_indent(indent); 1771 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 1772 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 1773 1774 db_print_indent(indent); 1775 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 1776 &tp->t_timers->tt_delack, tp->t_inpcb); 1777 1778 db_print_indent(indent); 1779 db_printf("t_state: %d (", tp->t_state); 1780 db_print_tstate(tp->t_state); 1781 db_printf(")\n"); 1782 1783 db_print_indent(indent); 1784 db_printf("t_flags: 0x%x (", tp->t_flags); 1785 db_print_tflags(tp->t_flags); 1786 db_printf(")\n"); 1787 1788 db_print_indent(indent); 1789 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 1790 tp->snd_una, tp->snd_max, tp->snd_nxt); 1791 1792 db_print_indent(indent); 1793 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 1794 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 1795 1796 db_print_indent(indent); 1797 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 1798 tp->iss, tp->irs, tp->rcv_nxt); 1799 1800 db_print_indent(indent); 1801 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 1802 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 1803 1804 db_print_indent(indent); 1805 db_printf("snd_wnd: %lu snd_cwnd: %lu snd_bwnd: %lu\n", 1806 tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd); 1807 1808 db_print_indent(indent); 1809 db_printf("snd_ssthresh: %lu snd_bandwidth: %lu snd_recover: " 1810 "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth, 1811 tp->snd_recover); 1812 1813 db_print_indent(indent); 1814 db_printf("t_maxopd: %u t_rcvtime: %u t_startime: %u\n", 1815 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime); 1816 1817 db_print_indent(indent); 1818 db_printf("t_rttime: %u t_rtsq: 0x%08x t_bw_rtttime: %u\n", 1819 tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime); 1820 1821 db_print_indent(indent); 1822 db_printf("t_bw_rtseq: 0x%08x t_rxtcur: %d t_maxseg: %u " 1823 "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg, 1824 tp->t_srtt); 1825 1826 db_print_indent(indent); 1827 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 1828 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 1829 tp->t_rttbest); 1830 1831 db_print_indent(indent); 1832 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 1833 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 1834 1835 db_print_indent(indent); 1836 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 1837 db_print_toobflags(tp->t_oobflags); 1838 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 1839 1840 db_print_indent(indent); 1841 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 1842 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 1843 1844 db_print_indent(indent); 1845 db_printf("ts_recent: %u ts_recent_age: %u\n", 1846 tp->ts_recent, tp->ts_recent_age); 1847 1848 db_print_indent(indent); 1849 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 1850 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 1851 1852 db_print_indent(indent); 1853 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 1854 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 1855 tp->snd_recover_prev, tp->t_badrxtwin); 1856 1857 db_print_indent(indent); 1858 db_printf("snd_numholes: %d snd_holes first: %p\n", 1859 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 1860 1861 db_print_indent(indent); 1862 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 1863 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 1864 1865 /* Skip sackblks, sackhint. */ 1866 1867 db_print_indent(indent); 1868 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 1869 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 1870 } 1871 1872 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 1873 { 1874 struct tcpcb *tp; 1875 1876 if (!have_addr) { 1877 db_printf("usage: show tcpcb <addr>\n"); 1878 return; 1879 } 1880 tp = (struct tcpcb *)addr; 1881 1882 db_print_tcpcb(tp, "tcpcb", 0); 1883 } 1884 #endif
Cache object: de88aa3d33c566d0870f1e8de64481bb
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