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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 * Copyright (c) 2010-2011 Juniper Networks, Inc. 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Robert N. M. Watson under 9 * contract to Juniper Networks, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/11.0/sys/netinet/tcp_usrreq.c 298673 2016-04-26 23:02:18Z cem $"); 40 41 #include "opt_ddb.h" 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 #include "opt_tcpdebug.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/limits.h> 49 #include <sys/malloc.h> 50 #include <sys/refcount.h> 51 #include <sys/kernel.h> 52 #include <sys/sysctl.h> 53 #include <sys/mbuf.h> 54 #ifdef INET6 55 #include <sys/domain.h> 56 #endif /* INET6 */ 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/protosw.h> 60 #include <sys/proc.h> 61 #include <sys/jail.h> 62 63 #ifdef DDB 64 #include <ddb/ddb.h> 65 #endif 66 67 #include <net/if.h> 68 #include <net/if_var.h> 69 #include <net/route.h> 70 #include <net/vnet.h> 71 72 #include <netinet/in.h> 73 #include <netinet/in_kdtrace.h> 74 #include <netinet/in_pcb.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/in_var.h> 77 #include <netinet/ip_var.h> 78 #ifdef INET6 79 #include <netinet/ip6.h> 80 #include <netinet6/in6_pcb.h> 81 #include <netinet6/ip6_var.h> 82 #include <netinet6/scope6_var.h> 83 #endif 84 #ifdef TCP_RFC7413 85 #include <netinet/tcp_fastopen.h> 86 #endif 87 #include <netinet/tcp.h> 88 #include <netinet/tcp_fsm.h> 89 #include <netinet/tcp_seq.h> 90 #include <netinet/tcp_timer.h> 91 #include <netinet/tcp_var.h> 92 #include <netinet/tcpip.h> 93 #include <netinet/cc/cc.h> 94 #ifdef TCPPCAP 95 #include <netinet/tcp_pcap.h> 96 #endif 97 #ifdef TCPDEBUG 98 #include <netinet/tcp_debug.h> 99 #endif 100 #ifdef TCP_OFFLOAD 101 #include <netinet/tcp_offload.h> 102 #endif 103 104 /* 105 * TCP protocol interface to socket abstraction. 106 */ 107 static int tcp_attach(struct socket *); 108 #ifdef INET 109 static int tcp_connect(struct tcpcb *, struct sockaddr *, 110 struct thread *td); 111 #endif /* INET */ 112 #ifdef INET6 113 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 114 struct thread *td); 115 #endif /* INET6 */ 116 static void tcp_disconnect(struct tcpcb *); 117 static void tcp_usrclosed(struct tcpcb *); 118 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 119 120 #ifdef TCPDEBUG 121 #define TCPDEBUG0 int ostate = 0 122 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 123 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 124 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 125 #else 126 #define TCPDEBUG0 127 #define TCPDEBUG1() 128 #define TCPDEBUG2(req) 129 #endif 130 131 /* 132 * TCP attaches to socket via pru_attach(), reserving space, 133 * and an internet control block. 134 */ 135 static int 136 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 137 { 138 struct inpcb *inp; 139 struct tcpcb *tp = NULL; 140 int error; 141 TCPDEBUG0; 142 143 inp = sotoinpcb(so); 144 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 145 TCPDEBUG1(); 146 147 error = tcp_attach(so); 148 if (error) 149 goto out; 150 151 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 152 so->so_linger = TCP_LINGERTIME; 153 154 inp = sotoinpcb(so); 155 tp = intotcpcb(inp); 156 out: 157 TCPDEBUG2(PRU_ATTACH); 158 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 159 return error; 160 } 161 162 /* 163 * tcp_detach is called when the socket layer loses its final reference 164 * to the socket, be it a file descriptor reference, a reference from TCP, 165 * etc. At this point, there is only one case in which we will keep around 166 * inpcb state: time wait. 167 * 168 * This function can probably be re-absorbed back into tcp_usr_detach() now 169 * that there is a single detach path. 170 */ 171 static void 172 tcp_detach(struct socket *so, struct inpcb *inp) 173 { 174 struct tcpcb *tp; 175 176 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 177 INP_WLOCK_ASSERT(inp); 178 179 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 180 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 181 182 tp = intotcpcb(inp); 183 184 if (inp->inp_flags & INP_TIMEWAIT) { 185 /* 186 * There are two cases to handle: one in which the time wait 187 * state is being discarded (INP_DROPPED), and one in which 188 * this connection will remain in timewait. In the former, 189 * it is time to discard all state (except tcptw, which has 190 * already been discarded by the timewait close code, which 191 * should be further up the call stack somewhere). In the 192 * latter case, we detach from the socket, but leave the pcb 193 * present until timewait ends. 194 * 195 * XXXRW: Would it be cleaner to free the tcptw here? 196 * 197 * Astute question indeed, from twtcp perspective there are 198 * three cases to consider: 199 * 200 * #1 tcp_detach is called at tcptw creation time by 201 * tcp_twstart, then do not discard the newly created tcptw 202 * and leave inpcb present until timewait ends 203 * #2 tcp_detach is called at timewait end (or reuse) by 204 * tcp_twclose, then the tcptw has already been discarded 205 * (or reused) and inpcb is freed here 206 * #3 tcp_detach is called() after timewait ends (or reuse) 207 * (e.g. by soclose), then tcptw has already been discarded 208 * (or reused) and inpcb is freed here 209 * 210 * In all three cases the tcptw should not be freed here. 211 */ 212 if (inp->inp_flags & INP_DROPPED) { 213 KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && " 214 "INP_DROPPED && tp != NULL")); 215 in_pcbdetach(inp); 216 in_pcbfree(inp); 217 } else { 218 in_pcbdetach(inp); 219 INP_WUNLOCK(inp); 220 } 221 } else { 222 /* 223 * If the connection is not in timewait, we consider two 224 * two conditions: one in which no further processing is 225 * necessary (dropped || embryonic), and one in which TCP is 226 * not yet done, but no longer requires the socket, so the 227 * pcb will persist for the time being. 228 * 229 * XXXRW: Does the second case still occur? 230 */ 231 if (inp->inp_flags & INP_DROPPED || 232 tp->t_state < TCPS_SYN_SENT) { 233 tcp_discardcb(tp); 234 in_pcbdetach(inp); 235 in_pcbfree(inp); 236 } else { 237 in_pcbdetach(inp); 238 INP_WUNLOCK(inp); 239 } 240 } 241 } 242 243 /* 244 * pru_detach() detaches the TCP protocol from the socket. 245 * If the protocol state is non-embryonic, then can't 246 * do this directly: have to initiate a pru_disconnect(), 247 * which may finish later; embryonic TCB's can just 248 * be discarded here. 249 */ 250 static void 251 tcp_usr_detach(struct socket *so) 252 { 253 struct inpcb *inp; 254 int rlock = 0; 255 256 inp = sotoinpcb(so); 257 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 258 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 259 INP_INFO_RLOCK(&V_tcbinfo); 260 rlock = 1; 261 } 262 INP_WLOCK(inp); 263 KASSERT(inp->inp_socket != NULL, 264 ("tcp_usr_detach: inp_socket == NULL")); 265 tcp_detach(so, inp); 266 if (rlock) 267 INP_INFO_RUNLOCK(&V_tcbinfo); 268 } 269 270 #ifdef INET 271 /* 272 * Give the socket an address. 273 */ 274 static int 275 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 276 { 277 int error = 0; 278 struct inpcb *inp; 279 struct tcpcb *tp = NULL; 280 struct sockaddr_in *sinp; 281 282 sinp = (struct sockaddr_in *)nam; 283 if (nam->sa_len != sizeof (*sinp)) 284 return (EINVAL); 285 /* 286 * Must check for multicast addresses and disallow binding 287 * to them. 288 */ 289 if (sinp->sin_family == AF_INET && 290 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 291 return (EAFNOSUPPORT); 292 293 TCPDEBUG0; 294 inp = sotoinpcb(so); 295 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 296 INP_WLOCK(inp); 297 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 298 error = EINVAL; 299 goto out; 300 } 301 tp = intotcpcb(inp); 302 TCPDEBUG1(); 303 INP_HASH_WLOCK(&V_tcbinfo); 304 error = in_pcbbind(inp, nam, td->td_ucred); 305 INP_HASH_WUNLOCK(&V_tcbinfo); 306 out: 307 TCPDEBUG2(PRU_BIND); 308 TCP_PROBE2(debug__user, tp, PRU_BIND); 309 INP_WUNLOCK(inp); 310 311 return (error); 312 } 313 #endif /* INET */ 314 315 #ifdef INET6 316 static int 317 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 318 { 319 int error = 0; 320 struct inpcb *inp; 321 struct tcpcb *tp = NULL; 322 struct sockaddr_in6 *sin6p; 323 324 sin6p = (struct sockaddr_in6 *)nam; 325 if (nam->sa_len != sizeof (*sin6p)) 326 return (EINVAL); 327 /* 328 * Must check for multicast addresses and disallow binding 329 * to them. 330 */ 331 if (sin6p->sin6_family == AF_INET6 && 332 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 333 return (EAFNOSUPPORT); 334 335 TCPDEBUG0; 336 inp = sotoinpcb(so); 337 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 338 INP_WLOCK(inp); 339 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 340 error = EINVAL; 341 goto out; 342 } 343 tp = intotcpcb(inp); 344 TCPDEBUG1(); 345 INP_HASH_WLOCK(&V_tcbinfo); 346 inp->inp_vflag &= ~INP_IPV4; 347 inp->inp_vflag |= INP_IPV6; 348 #ifdef INET 349 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 350 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 351 inp->inp_vflag |= INP_IPV4; 352 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 353 struct sockaddr_in sin; 354 355 in6_sin6_2_sin(&sin, sin6p); 356 inp->inp_vflag |= INP_IPV4; 357 inp->inp_vflag &= ~INP_IPV6; 358 error = in_pcbbind(inp, (struct sockaddr *)&sin, 359 td->td_ucred); 360 INP_HASH_WUNLOCK(&V_tcbinfo); 361 goto out; 362 } 363 } 364 #endif 365 error = in6_pcbbind(inp, nam, td->td_ucred); 366 INP_HASH_WUNLOCK(&V_tcbinfo); 367 out: 368 TCPDEBUG2(PRU_BIND); 369 TCP_PROBE2(debug__user, tp, PRU_BIND); 370 INP_WUNLOCK(inp); 371 return (error); 372 } 373 #endif /* INET6 */ 374 375 #ifdef INET 376 /* 377 * Prepare to accept connections. 378 */ 379 static int 380 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 381 { 382 int error = 0; 383 struct inpcb *inp; 384 struct tcpcb *tp = NULL; 385 386 TCPDEBUG0; 387 inp = sotoinpcb(so); 388 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 389 INP_WLOCK(inp); 390 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 391 error = EINVAL; 392 goto out; 393 } 394 tp = intotcpcb(inp); 395 TCPDEBUG1(); 396 SOCK_LOCK(so); 397 error = solisten_proto_check(so); 398 INP_HASH_WLOCK(&V_tcbinfo); 399 if (error == 0 && inp->inp_lport == 0) 400 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 401 INP_HASH_WUNLOCK(&V_tcbinfo); 402 if (error == 0) { 403 tcp_state_change(tp, TCPS_LISTEN); 404 solisten_proto(so, backlog); 405 #ifdef TCP_OFFLOAD 406 if ((so->so_options & SO_NO_OFFLOAD) == 0) 407 tcp_offload_listen_start(tp); 408 #endif 409 } 410 SOCK_UNLOCK(so); 411 412 #ifdef TCP_RFC7413 413 if (tp->t_flags & TF_FASTOPEN) 414 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 415 #endif 416 out: 417 TCPDEBUG2(PRU_LISTEN); 418 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 419 INP_WUNLOCK(inp); 420 return (error); 421 } 422 #endif /* INET */ 423 424 #ifdef INET6 425 static int 426 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 427 { 428 int error = 0; 429 struct inpcb *inp; 430 struct tcpcb *tp = NULL; 431 432 TCPDEBUG0; 433 inp = sotoinpcb(so); 434 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 435 INP_WLOCK(inp); 436 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 437 error = EINVAL; 438 goto out; 439 } 440 tp = intotcpcb(inp); 441 TCPDEBUG1(); 442 SOCK_LOCK(so); 443 error = solisten_proto_check(so); 444 INP_HASH_WLOCK(&V_tcbinfo); 445 if (error == 0 && inp->inp_lport == 0) { 446 inp->inp_vflag &= ~INP_IPV4; 447 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 448 inp->inp_vflag |= INP_IPV4; 449 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 450 } 451 INP_HASH_WUNLOCK(&V_tcbinfo); 452 if (error == 0) { 453 tcp_state_change(tp, TCPS_LISTEN); 454 solisten_proto(so, backlog); 455 #ifdef TCP_OFFLOAD 456 if ((so->so_options & SO_NO_OFFLOAD) == 0) 457 tcp_offload_listen_start(tp); 458 #endif 459 } 460 SOCK_UNLOCK(so); 461 462 #ifdef TCP_RFC7413 463 if (tp->t_flags & TF_FASTOPEN) 464 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 465 #endif 466 out: 467 TCPDEBUG2(PRU_LISTEN); 468 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 469 INP_WUNLOCK(inp); 470 return (error); 471 } 472 #endif /* INET6 */ 473 474 #ifdef INET 475 /* 476 * Initiate connection to peer. 477 * Create a template for use in transmissions on this connection. 478 * Enter SYN_SENT state, and mark socket as connecting. 479 * Start keep-alive timer, and seed output sequence space. 480 * Send initial segment on connection. 481 */ 482 static int 483 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 484 { 485 int error = 0; 486 struct inpcb *inp; 487 struct tcpcb *tp = NULL; 488 struct sockaddr_in *sinp; 489 490 sinp = (struct sockaddr_in *)nam; 491 if (nam->sa_len != sizeof (*sinp)) 492 return (EINVAL); 493 /* 494 * Must disallow TCP ``connections'' to multicast addresses. 495 */ 496 if (sinp->sin_family == AF_INET 497 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 498 return (EAFNOSUPPORT); 499 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 500 return (error); 501 502 TCPDEBUG0; 503 inp = sotoinpcb(so); 504 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 505 INP_WLOCK(inp); 506 if (inp->inp_flags & INP_TIMEWAIT) { 507 error = EADDRINUSE; 508 goto out; 509 } 510 if (inp->inp_flags & INP_DROPPED) { 511 error = ECONNREFUSED; 512 goto out; 513 } 514 tp = intotcpcb(inp); 515 TCPDEBUG1(); 516 if ((error = tcp_connect(tp, nam, td)) != 0) 517 goto out; 518 #ifdef TCP_OFFLOAD 519 if (registered_toedevs > 0 && 520 (so->so_options & SO_NO_OFFLOAD) == 0 && 521 (error = tcp_offload_connect(so, nam)) == 0) 522 goto out; 523 #endif 524 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 525 error = tp->t_fb->tfb_tcp_output(tp); 526 out: 527 TCPDEBUG2(PRU_CONNECT); 528 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 529 INP_WUNLOCK(inp); 530 return (error); 531 } 532 #endif /* INET */ 533 534 #ifdef INET6 535 static int 536 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 537 { 538 int error = 0; 539 struct inpcb *inp; 540 struct tcpcb *tp = NULL; 541 struct sockaddr_in6 *sin6p; 542 543 TCPDEBUG0; 544 545 sin6p = (struct sockaddr_in6 *)nam; 546 if (nam->sa_len != sizeof (*sin6p)) 547 return (EINVAL); 548 /* 549 * Must disallow TCP ``connections'' to multicast addresses. 550 */ 551 if (sin6p->sin6_family == AF_INET6 552 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 553 return (EAFNOSUPPORT); 554 555 inp = sotoinpcb(so); 556 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 557 INP_WLOCK(inp); 558 if (inp->inp_flags & INP_TIMEWAIT) { 559 error = EADDRINUSE; 560 goto out; 561 } 562 if (inp->inp_flags & INP_DROPPED) { 563 error = ECONNREFUSED; 564 goto out; 565 } 566 tp = intotcpcb(inp); 567 TCPDEBUG1(); 568 #ifdef INET 569 /* 570 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 571 * therefore probably require the hash lock, which isn't held here. 572 * Is this a significant problem? 573 */ 574 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 575 struct sockaddr_in sin; 576 577 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 578 error = EINVAL; 579 goto out; 580 } 581 582 in6_sin6_2_sin(&sin, sin6p); 583 inp->inp_vflag |= INP_IPV4; 584 inp->inp_vflag &= ~INP_IPV6; 585 if ((error = prison_remote_ip4(td->td_ucred, 586 &sin.sin_addr)) != 0) 587 goto out; 588 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 589 goto out; 590 #ifdef TCP_OFFLOAD 591 if (registered_toedevs > 0 && 592 (so->so_options & SO_NO_OFFLOAD) == 0 && 593 (error = tcp_offload_connect(so, nam)) == 0) 594 goto out; 595 #endif 596 error = tp->t_fb->tfb_tcp_output(tp); 597 goto out; 598 } 599 #endif 600 inp->inp_vflag &= ~INP_IPV4; 601 inp->inp_vflag |= INP_IPV6; 602 inp->inp_inc.inc_flags |= INC_ISIPV6; 603 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 604 goto out; 605 if ((error = tcp6_connect(tp, nam, td)) != 0) 606 goto out; 607 #ifdef TCP_OFFLOAD 608 if (registered_toedevs > 0 && 609 (so->so_options & SO_NO_OFFLOAD) == 0 && 610 (error = tcp_offload_connect(so, nam)) == 0) 611 goto out; 612 #endif 613 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 614 error = tp->t_fb->tfb_tcp_output(tp); 615 616 out: 617 TCPDEBUG2(PRU_CONNECT); 618 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 619 INP_WUNLOCK(inp); 620 return (error); 621 } 622 #endif /* INET6 */ 623 624 /* 625 * Initiate disconnect from peer. 626 * If connection never passed embryonic stage, just drop; 627 * else if don't need to let data drain, then can just drop anyways, 628 * else have to begin TCP shutdown process: mark socket disconnecting, 629 * drain unread data, state switch to reflect user close, and 630 * send segment (e.g. FIN) to peer. Socket will be really disconnected 631 * when peer sends FIN and acks ours. 632 * 633 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 634 */ 635 static int 636 tcp_usr_disconnect(struct socket *so) 637 { 638 struct inpcb *inp; 639 struct tcpcb *tp = NULL; 640 int error = 0; 641 642 TCPDEBUG0; 643 INP_INFO_RLOCK(&V_tcbinfo); 644 inp = sotoinpcb(so); 645 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 646 INP_WLOCK(inp); 647 if (inp->inp_flags & INP_TIMEWAIT) 648 goto out; 649 if (inp->inp_flags & INP_DROPPED) { 650 error = ECONNRESET; 651 goto out; 652 } 653 tp = intotcpcb(inp); 654 TCPDEBUG1(); 655 tcp_disconnect(tp); 656 out: 657 TCPDEBUG2(PRU_DISCONNECT); 658 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 659 INP_WUNLOCK(inp); 660 INP_INFO_RUNLOCK(&V_tcbinfo); 661 return (error); 662 } 663 664 #ifdef INET 665 /* 666 * Accept a connection. Essentially all the work is done at higher levels; 667 * just return the address of the peer, storing through addr. 668 */ 669 static int 670 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 671 { 672 int error = 0; 673 struct inpcb *inp = NULL; 674 struct tcpcb *tp = NULL; 675 struct in_addr addr; 676 in_port_t port = 0; 677 TCPDEBUG0; 678 679 if (so->so_state & SS_ISDISCONNECTED) 680 return (ECONNABORTED); 681 682 inp = sotoinpcb(so); 683 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 684 INP_WLOCK(inp); 685 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 686 error = ECONNABORTED; 687 goto out; 688 } 689 tp = intotcpcb(inp); 690 TCPDEBUG1(); 691 692 /* 693 * We inline in_getpeeraddr and COMMON_END here, so that we can 694 * copy the data of interest and defer the malloc until after we 695 * release the lock. 696 */ 697 port = inp->inp_fport; 698 addr = inp->inp_faddr; 699 700 out: 701 TCPDEBUG2(PRU_ACCEPT); 702 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 703 INP_WUNLOCK(inp); 704 if (error == 0) 705 *nam = in_sockaddr(port, &addr); 706 return error; 707 } 708 #endif /* INET */ 709 710 #ifdef INET6 711 static int 712 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 713 { 714 struct inpcb *inp = NULL; 715 int error = 0; 716 struct tcpcb *tp = NULL; 717 struct in_addr addr; 718 struct in6_addr addr6; 719 in_port_t port = 0; 720 int v4 = 0; 721 TCPDEBUG0; 722 723 if (so->so_state & SS_ISDISCONNECTED) 724 return (ECONNABORTED); 725 726 inp = sotoinpcb(so); 727 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 728 INP_INFO_RLOCK(&V_tcbinfo); 729 INP_WLOCK(inp); 730 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 731 error = ECONNABORTED; 732 goto out; 733 } 734 tp = intotcpcb(inp); 735 TCPDEBUG1(); 736 737 /* 738 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 739 * copy the data of interest and defer the malloc until after we 740 * release the lock. 741 */ 742 if (inp->inp_vflag & INP_IPV4) { 743 v4 = 1; 744 port = inp->inp_fport; 745 addr = inp->inp_faddr; 746 } else { 747 port = inp->inp_fport; 748 addr6 = inp->in6p_faddr; 749 } 750 751 out: 752 TCPDEBUG2(PRU_ACCEPT); 753 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 754 INP_WUNLOCK(inp); 755 INP_INFO_RUNLOCK(&V_tcbinfo); 756 if (error == 0) { 757 if (v4) 758 *nam = in6_v4mapsin6_sockaddr(port, &addr); 759 else 760 *nam = in6_sockaddr(port, &addr6); 761 } 762 return error; 763 } 764 #endif /* INET6 */ 765 766 /* 767 * Mark the connection as being incapable of further output. 768 */ 769 static int 770 tcp_usr_shutdown(struct socket *so) 771 { 772 int error = 0; 773 struct inpcb *inp; 774 struct tcpcb *tp = NULL; 775 776 TCPDEBUG0; 777 INP_INFO_RLOCK(&V_tcbinfo); 778 inp = sotoinpcb(so); 779 KASSERT(inp != NULL, ("inp == NULL")); 780 INP_WLOCK(inp); 781 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 782 error = ECONNRESET; 783 goto out; 784 } 785 tp = intotcpcb(inp); 786 TCPDEBUG1(); 787 socantsendmore(so); 788 tcp_usrclosed(tp); 789 if (!(inp->inp_flags & INP_DROPPED)) 790 error = tp->t_fb->tfb_tcp_output(tp); 791 792 out: 793 TCPDEBUG2(PRU_SHUTDOWN); 794 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 795 INP_WUNLOCK(inp); 796 INP_INFO_RUNLOCK(&V_tcbinfo); 797 798 return (error); 799 } 800 801 /* 802 * After a receive, possibly send window update to peer. 803 */ 804 static int 805 tcp_usr_rcvd(struct socket *so, int flags) 806 { 807 struct inpcb *inp; 808 struct tcpcb *tp = NULL; 809 int error = 0; 810 811 TCPDEBUG0; 812 inp = sotoinpcb(so); 813 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 814 INP_WLOCK(inp); 815 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 816 error = ECONNRESET; 817 goto out; 818 } 819 tp = intotcpcb(inp); 820 TCPDEBUG1(); 821 #ifdef TCP_RFC7413 822 /* 823 * For passively-created TFO connections, don't attempt a window 824 * update while still in SYN_RECEIVED as this may trigger an early 825 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 826 * application response data, or failing that, when the DELACK timer 827 * expires. 828 */ 829 if ((tp->t_flags & TF_FASTOPEN) && 830 (tp->t_state == TCPS_SYN_RECEIVED)) 831 goto out; 832 #endif 833 #ifdef TCP_OFFLOAD 834 if (tp->t_flags & TF_TOE) 835 tcp_offload_rcvd(tp); 836 else 837 #endif 838 tp->t_fb->tfb_tcp_output(tp); 839 840 out: 841 TCPDEBUG2(PRU_RCVD); 842 TCP_PROBE2(debug__user, tp, PRU_RCVD); 843 INP_WUNLOCK(inp); 844 return (error); 845 } 846 847 /* 848 * Do a send by putting data in output queue and updating urgent 849 * marker if URG set. Possibly send more data. Unlike the other 850 * pru_*() routines, the mbuf chains are our responsibility. We 851 * must either enqueue them or free them. The other pru_* routines 852 * generally are caller-frees. 853 */ 854 static int 855 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 856 struct sockaddr *nam, struct mbuf *control, struct thread *td) 857 { 858 int error = 0; 859 struct inpcb *inp; 860 struct tcpcb *tp = NULL; 861 #ifdef INET6 862 int isipv6; 863 #endif 864 TCPDEBUG0; 865 866 /* 867 * We require the pcbinfo lock if we will close the socket as part of 868 * this call. 869 */ 870 if (flags & PRUS_EOF) 871 INP_INFO_RLOCK(&V_tcbinfo); 872 inp = sotoinpcb(so); 873 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 874 INP_WLOCK(inp); 875 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 876 if (control) 877 m_freem(control); 878 /* 879 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 880 * for freeing memory. 881 */ 882 if (m && (flags & PRUS_NOTREADY) == 0) 883 m_freem(m); 884 error = ECONNRESET; 885 goto out; 886 } 887 #ifdef INET6 888 isipv6 = nam && nam->sa_family == AF_INET6; 889 #endif /* INET6 */ 890 tp = intotcpcb(inp); 891 TCPDEBUG1(); 892 if (control) { 893 /* TCP doesn't do control messages (rights, creds, etc) */ 894 if (control->m_len) { 895 m_freem(control); 896 if (m) 897 m_freem(m); 898 error = EINVAL; 899 goto out; 900 } 901 m_freem(control); /* empty control, just free it */ 902 } 903 if (!(flags & PRUS_OOB)) { 904 sbappendstream(&so->so_snd, m, flags); 905 if (nam && tp->t_state < TCPS_SYN_SENT) { 906 /* 907 * Do implied connect if not yet connected, 908 * initialize window to default value, and 909 * initialize maxseg using peer's cached MSS. 910 */ 911 #ifdef INET6 912 if (isipv6) 913 error = tcp6_connect(tp, nam, td); 914 #endif /* INET6 */ 915 #if defined(INET6) && defined(INET) 916 else 917 #endif 918 #ifdef INET 919 error = tcp_connect(tp, nam, td); 920 #endif 921 if (error) 922 goto out; 923 tp->snd_wnd = TTCP_CLIENT_SND_WND; 924 tcp_mss(tp, -1); 925 } 926 if (flags & PRUS_EOF) { 927 /* 928 * Close the send side of the connection after 929 * the data is sent. 930 */ 931 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 932 socantsendmore(so); 933 tcp_usrclosed(tp); 934 } 935 if (!(inp->inp_flags & INP_DROPPED) && 936 !(flags & PRUS_NOTREADY)) { 937 if (flags & PRUS_MORETOCOME) 938 tp->t_flags |= TF_MORETOCOME; 939 error = tp->t_fb->tfb_tcp_output(tp); 940 if (flags & PRUS_MORETOCOME) 941 tp->t_flags &= ~TF_MORETOCOME; 942 } 943 } else { 944 /* 945 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 946 */ 947 SOCKBUF_LOCK(&so->so_snd); 948 if (sbspace(&so->so_snd) < -512) { 949 SOCKBUF_UNLOCK(&so->so_snd); 950 m_freem(m); 951 error = ENOBUFS; 952 goto out; 953 } 954 /* 955 * According to RFC961 (Assigned Protocols), 956 * the urgent pointer points to the last octet 957 * of urgent data. We continue, however, 958 * to consider it to indicate the first octet 959 * of data past the urgent section. 960 * Otherwise, snd_up should be one lower. 961 */ 962 sbappendstream_locked(&so->so_snd, m, flags); 963 SOCKBUF_UNLOCK(&so->so_snd); 964 if (nam && tp->t_state < TCPS_SYN_SENT) { 965 /* 966 * Do implied connect if not yet connected, 967 * initialize window to default value, and 968 * initialize maxseg using peer's cached MSS. 969 */ 970 #ifdef INET6 971 if (isipv6) 972 error = tcp6_connect(tp, nam, td); 973 #endif /* INET6 */ 974 #if defined(INET6) && defined(INET) 975 else 976 #endif 977 #ifdef INET 978 error = tcp_connect(tp, nam, td); 979 #endif 980 if (error) 981 goto out; 982 tp->snd_wnd = TTCP_CLIENT_SND_WND; 983 tcp_mss(tp, -1); 984 } 985 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 986 if (!(flags & PRUS_NOTREADY)) { 987 tp->t_flags |= TF_FORCEDATA; 988 error = tp->t_fb->tfb_tcp_output(tp); 989 tp->t_flags &= ~TF_FORCEDATA; 990 } 991 } 992 out: 993 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 994 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 995 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 996 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 997 INP_WUNLOCK(inp); 998 if (flags & PRUS_EOF) 999 INP_INFO_RUNLOCK(&V_tcbinfo); 1000 return (error); 1001 } 1002 1003 static int 1004 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1005 { 1006 struct inpcb *inp; 1007 struct tcpcb *tp; 1008 int error; 1009 1010 inp = sotoinpcb(so); 1011 INP_WLOCK(inp); 1012 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1013 INP_WUNLOCK(inp); 1014 for (int i = 0; i < count; i++) 1015 m = m_free(m); 1016 return (ECONNRESET); 1017 } 1018 tp = intotcpcb(inp); 1019 1020 SOCKBUF_LOCK(&so->so_snd); 1021 error = sbready(&so->so_snd, m, count); 1022 SOCKBUF_UNLOCK(&so->so_snd); 1023 if (error == 0) 1024 error = tp->t_fb->tfb_tcp_output(tp); 1025 INP_WUNLOCK(inp); 1026 1027 return (error); 1028 } 1029 1030 /* 1031 * Abort the TCP. Drop the connection abruptly. 1032 */ 1033 static void 1034 tcp_usr_abort(struct socket *so) 1035 { 1036 struct inpcb *inp; 1037 struct tcpcb *tp = NULL; 1038 TCPDEBUG0; 1039 1040 inp = sotoinpcb(so); 1041 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1042 1043 INP_INFO_RLOCK(&V_tcbinfo); 1044 INP_WLOCK(inp); 1045 KASSERT(inp->inp_socket != NULL, 1046 ("tcp_usr_abort: inp_socket == NULL")); 1047 1048 /* 1049 * If we still have full TCP state, and we're not dropped, drop. 1050 */ 1051 if (!(inp->inp_flags & INP_TIMEWAIT) && 1052 !(inp->inp_flags & INP_DROPPED)) { 1053 tp = intotcpcb(inp); 1054 TCPDEBUG1(); 1055 tcp_drop(tp, ECONNABORTED); 1056 TCPDEBUG2(PRU_ABORT); 1057 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1058 } 1059 if (!(inp->inp_flags & INP_DROPPED)) { 1060 SOCK_LOCK(so); 1061 so->so_state |= SS_PROTOREF; 1062 SOCK_UNLOCK(so); 1063 inp->inp_flags |= INP_SOCKREF; 1064 } 1065 INP_WUNLOCK(inp); 1066 INP_INFO_RUNLOCK(&V_tcbinfo); 1067 } 1068 1069 /* 1070 * TCP socket is closed. Start friendly disconnect. 1071 */ 1072 static void 1073 tcp_usr_close(struct socket *so) 1074 { 1075 struct inpcb *inp; 1076 struct tcpcb *tp = NULL; 1077 TCPDEBUG0; 1078 1079 inp = sotoinpcb(so); 1080 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1081 1082 INP_INFO_RLOCK(&V_tcbinfo); 1083 INP_WLOCK(inp); 1084 KASSERT(inp->inp_socket != NULL, 1085 ("tcp_usr_close: inp_socket == NULL")); 1086 1087 /* 1088 * If we still have full TCP state, and we're not dropped, initiate 1089 * a disconnect. 1090 */ 1091 if (!(inp->inp_flags & INP_TIMEWAIT) && 1092 !(inp->inp_flags & INP_DROPPED)) { 1093 tp = intotcpcb(inp); 1094 TCPDEBUG1(); 1095 tcp_disconnect(tp); 1096 TCPDEBUG2(PRU_CLOSE); 1097 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1098 } 1099 if (!(inp->inp_flags & INP_DROPPED)) { 1100 SOCK_LOCK(so); 1101 so->so_state |= SS_PROTOREF; 1102 SOCK_UNLOCK(so); 1103 inp->inp_flags |= INP_SOCKREF; 1104 } 1105 INP_WUNLOCK(inp); 1106 INP_INFO_RUNLOCK(&V_tcbinfo); 1107 } 1108 1109 /* 1110 * Receive out-of-band data. 1111 */ 1112 static int 1113 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1114 { 1115 int error = 0; 1116 struct inpcb *inp; 1117 struct tcpcb *tp = NULL; 1118 1119 TCPDEBUG0; 1120 inp = sotoinpcb(so); 1121 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1122 INP_WLOCK(inp); 1123 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1124 error = ECONNRESET; 1125 goto out; 1126 } 1127 tp = intotcpcb(inp); 1128 TCPDEBUG1(); 1129 if ((so->so_oobmark == 0 && 1130 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1131 so->so_options & SO_OOBINLINE || 1132 tp->t_oobflags & TCPOOB_HADDATA) { 1133 error = EINVAL; 1134 goto out; 1135 } 1136 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1137 error = EWOULDBLOCK; 1138 goto out; 1139 } 1140 m->m_len = 1; 1141 *mtod(m, caddr_t) = tp->t_iobc; 1142 if ((flags & MSG_PEEK) == 0) 1143 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1144 1145 out: 1146 TCPDEBUG2(PRU_RCVOOB); 1147 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1148 INP_WUNLOCK(inp); 1149 return (error); 1150 } 1151 1152 #ifdef INET 1153 struct pr_usrreqs tcp_usrreqs = { 1154 .pru_abort = tcp_usr_abort, 1155 .pru_accept = tcp_usr_accept, 1156 .pru_attach = tcp_usr_attach, 1157 .pru_bind = tcp_usr_bind, 1158 .pru_connect = tcp_usr_connect, 1159 .pru_control = in_control, 1160 .pru_detach = tcp_usr_detach, 1161 .pru_disconnect = tcp_usr_disconnect, 1162 .pru_listen = tcp_usr_listen, 1163 .pru_peeraddr = in_getpeeraddr, 1164 .pru_rcvd = tcp_usr_rcvd, 1165 .pru_rcvoob = tcp_usr_rcvoob, 1166 .pru_send = tcp_usr_send, 1167 .pru_ready = tcp_usr_ready, 1168 .pru_shutdown = tcp_usr_shutdown, 1169 .pru_sockaddr = in_getsockaddr, 1170 .pru_sosetlabel = in_pcbsosetlabel, 1171 .pru_close = tcp_usr_close, 1172 }; 1173 #endif /* INET */ 1174 1175 #ifdef INET6 1176 struct pr_usrreqs tcp6_usrreqs = { 1177 .pru_abort = tcp_usr_abort, 1178 .pru_accept = tcp6_usr_accept, 1179 .pru_attach = tcp_usr_attach, 1180 .pru_bind = tcp6_usr_bind, 1181 .pru_connect = tcp6_usr_connect, 1182 .pru_control = in6_control, 1183 .pru_detach = tcp_usr_detach, 1184 .pru_disconnect = tcp_usr_disconnect, 1185 .pru_listen = tcp6_usr_listen, 1186 .pru_peeraddr = in6_mapped_peeraddr, 1187 .pru_rcvd = tcp_usr_rcvd, 1188 .pru_rcvoob = tcp_usr_rcvoob, 1189 .pru_send = tcp_usr_send, 1190 .pru_ready = tcp_usr_ready, 1191 .pru_shutdown = tcp_usr_shutdown, 1192 .pru_sockaddr = in6_mapped_sockaddr, 1193 .pru_sosetlabel = in_pcbsosetlabel, 1194 .pru_close = tcp_usr_close, 1195 }; 1196 #endif /* INET6 */ 1197 1198 #ifdef INET 1199 /* 1200 * Common subroutine to open a TCP connection to remote host specified 1201 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1202 * port number if needed. Call in_pcbconnect_setup to do the routing and 1203 * to choose a local host address (interface). If there is an existing 1204 * incarnation of the same connection in TIME-WAIT state and if the remote 1205 * host was sending CC options and if the connection duration was < MSL, then 1206 * truncate the previous TIME-WAIT state and proceed. 1207 * Initialize connection parameters and enter SYN-SENT state. 1208 */ 1209 static int 1210 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1211 { 1212 struct inpcb *inp = tp->t_inpcb, *oinp; 1213 struct socket *so = inp->inp_socket; 1214 struct in_addr laddr; 1215 u_short lport; 1216 int error; 1217 1218 INP_WLOCK_ASSERT(inp); 1219 INP_HASH_WLOCK(&V_tcbinfo); 1220 1221 if (inp->inp_lport == 0) { 1222 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1223 if (error) 1224 goto out; 1225 } 1226 1227 /* 1228 * Cannot simply call in_pcbconnect, because there might be an 1229 * earlier incarnation of this same connection still in 1230 * TIME_WAIT state, creating an ADDRINUSE error. 1231 */ 1232 laddr = inp->inp_laddr; 1233 lport = inp->inp_lport; 1234 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1235 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1236 if (error && oinp == NULL) 1237 goto out; 1238 if (oinp) { 1239 error = EADDRINUSE; 1240 goto out; 1241 } 1242 inp->inp_laddr = laddr; 1243 in_pcbrehash(inp); 1244 INP_HASH_WUNLOCK(&V_tcbinfo); 1245 1246 /* 1247 * Compute window scaling to request: 1248 * Scale to fit into sweet spot. See tcp_syncache.c. 1249 * XXX: This should move to tcp_output(). 1250 */ 1251 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1252 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1253 tp->request_r_scale++; 1254 1255 soisconnecting(so); 1256 TCPSTAT_INC(tcps_connattempt); 1257 tcp_state_change(tp, TCPS_SYN_SENT); 1258 tp->iss = tcp_new_isn(tp); 1259 tcp_sendseqinit(tp); 1260 1261 return 0; 1262 1263 out: 1264 INP_HASH_WUNLOCK(&V_tcbinfo); 1265 return (error); 1266 } 1267 #endif /* INET */ 1268 1269 #ifdef INET6 1270 static int 1271 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1272 { 1273 struct inpcb *inp = tp->t_inpcb; 1274 int error; 1275 1276 INP_WLOCK_ASSERT(inp); 1277 INP_HASH_WLOCK(&V_tcbinfo); 1278 1279 if (inp->inp_lport == 0) { 1280 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1281 if (error) 1282 goto out; 1283 } 1284 error = in6_pcbconnect(inp, nam, td->td_ucred); 1285 if (error != 0) 1286 goto out; 1287 INP_HASH_WUNLOCK(&V_tcbinfo); 1288 1289 /* Compute window scaling to request. */ 1290 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1291 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1292 tp->request_r_scale++; 1293 1294 soisconnecting(inp->inp_socket); 1295 TCPSTAT_INC(tcps_connattempt); 1296 tcp_state_change(tp, TCPS_SYN_SENT); 1297 tp->iss = tcp_new_isn(tp); 1298 tcp_sendseqinit(tp); 1299 1300 return 0; 1301 1302 out: 1303 INP_HASH_WUNLOCK(&V_tcbinfo); 1304 return error; 1305 } 1306 #endif /* INET6 */ 1307 1308 /* 1309 * Export TCP internal state information via a struct tcp_info, based on the 1310 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1311 * (TCP state machine, etc). We export all information using FreeBSD-native 1312 * constants -- for example, the numeric values for tcpi_state will differ 1313 * from Linux. 1314 */ 1315 static void 1316 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1317 { 1318 1319 INP_WLOCK_ASSERT(tp->t_inpcb); 1320 bzero(ti, sizeof(*ti)); 1321 1322 ti->tcpi_state = tp->t_state; 1323 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1324 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1325 if (tp->t_flags & TF_SACK_PERMIT) 1326 ti->tcpi_options |= TCPI_OPT_SACK; 1327 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1328 ti->tcpi_options |= TCPI_OPT_WSCALE; 1329 ti->tcpi_snd_wscale = tp->snd_scale; 1330 ti->tcpi_rcv_wscale = tp->rcv_scale; 1331 } 1332 1333 ti->tcpi_rto = tp->t_rxtcur * tick; 1334 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1335 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1336 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1337 1338 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1339 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1340 1341 /* 1342 * FreeBSD-specific extension fields for tcp_info. 1343 */ 1344 ti->tcpi_rcv_space = tp->rcv_wnd; 1345 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1346 ti->tcpi_snd_wnd = tp->snd_wnd; 1347 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1348 ti->tcpi_snd_nxt = tp->snd_nxt; 1349 ti->tcpi_snd_mss = tp->t_maxseg; 1350 ti->tcpi_rcv_mss = tp->t_maxseg; 1351 if (tp->t_flags & TF_TOE) 1352 ti->tcpi_options |= TCPI_OPT_TOE; 1353 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1354 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1355 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1356 } 1357 1358 /* 1359 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1360 * socket option arguments. When it re-acquires the lock after the copy, it 1361 * has to revalidate that the connection is still valid for the socket 1362 * option. 1363 */ 1364 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1365 INP_WLOCK(inp); \ 1366 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1367 INP_WUNLOCK(inp); \ 1368 cleanup; \ 1369 return (ECONNRESET); \ 1370 } \ 1371 tp = intotcpcb(inp); \ 1372 } while(0) 1373 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1374 1375 int 1376 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1377 { 1378 int error; 1379 struct inpcb *inp; 1380 struct tcpcb *tp; 1381 struct tcp_function_block *blk; 1382 struct tcp_function_set fsn; 1383 1384 error = 0; 1385 inp = sotoinpcb(so); 1386 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1387 INP_WLOCK(inp); 1388 if (sopt->sopt_level != IPPROTO_TCP) { 1389 #ifdef INET6 1390 if (inp->inp_vflag & INP_IPV6PROTO) { 1391 INP_WUNLOCK(inp); 1392 error = ip6_ctloutput(so, sopt); 1393 } 1394 #endif /* INET6 */ 1395 #if defined(INET6) && defined(INET) 1396 else 1397 #endif 1398 #ifdef INET 1399 { 1400 INP_WUNLOCK(inp); 1401 error = ip_ctloutput(so, sopt); 1402 } 1403 #endif 1404 return (error); 1405 } 1406 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1407 INP_WUNLOCK(inp); 1408 return (ECONNRESET); 1409 } 1410 tp = intotcpcb(inp); 1411 /* 1412 * Protect the TCP option TCP_FUNCTION_BLK so 1413 * that a sub-function can *never* overwrite this. 1414 */ 1415 if ((sopt->sopt_dir == SOPT_SET) && 1416 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1417 INP_WUNLOCK(inp); 1418 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1419 sizeof fsn); 1420 if (error) 1421 return (error); 1422 INP_WLOCK_RECHECK(inp); 1423 if (tp->t_state != TCPS_CLOSED) { 1424 /* 1425 * The user has advanced the state 1426 * past the initial point, we can't 1427 * switch since we are down the road 1428 * and a new set of functions may 1429 * not be compatibile. 1430 */ 1431 INP_WUNLOCK(inp); 1432 return(EINVAL); 1433 } 1434 blk = find_and_ref_tcp_functions(&fsn); 1435 if (blk == NULL) { 1436 INP_WUNLOCK(inp); 1437 return (ENOENT); 1438 } 1439 if (tp->t_fb != blk) { 1440 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1441 refcount_release(&blk->tfb_refcnt); 1442 INP_WUNLOCK(inp); 1443 return (ENOENT); 1444 } 1445 /* 1446 * Release the old refcnt, the 1447 * lookup acquires a ref on the 1448 * new one. 1449 */ 1450 if (tp->t_fb->tfb_tcp_fb_fini) 1451 (*tp->t_fb->tfb_tcp_fb_fini)(tp); 1452 refcount_release(&tp->t_fb->tfb_refcnt); 1453 tp->t_fb = blk; 1454 if (tp->t_fb->tfb_tcp_fb_init) { 1455 (*tp->t_fb->tfb_tcp_fb_init)(tp); 1456 } 1457 } 1458 #ifdef TCP_OFFLOAD 1459 if (tp->t_flags & TF_TOE) { 1460 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1461 sopt->sopt_name); 1462 } 1463 #endif 1464 INP_WUNLOCK(inp); 1465 return (error); 1466 } else if ((sopt->sopt_dir == SOPT_GET) && 1467 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1468 strcpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name); 1469 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1470 INP_WUNLOCK(inp); 1471 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1472 return (error); 1473 } 1474 /* Pass in the INP locked, called must unlock it */ 1475 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1476 } 1477 1478 int 1479 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1480 { 1481 int error, opt, optval; 1482 u_int ui; 1483 struct tcp_info ti; 1484 struct cc_algo *algo; 1485 char *pbuf, buf[TCP_CA_NAME_MAX]; 1486 size_t len; 1487 1488 /* 1489 * For TCP_CCALGOOPT forward the control to CC module, for both 1490 * SOPT_SET and SOPT_GET. 1491 */ 1492 switch (sopt->sopt_name) { 1493 case TCP_CCALGOOPT: 1494 INP_WUNLOCK(inp); 1495 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1496 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1497 sopt->sopt_valsize); 1498 if (error) { 1499 free(pbuf, M_TEMP); 1500 return (error); 1501 } 1502 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1503 if (CC_ALGO(tp)->ctl_output != NULL) 1504 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1505 else 1506 error = ENOENT; 1507 INP_WUNLOCK(inp); 1508 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1509 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1510 free(pbuf, M_TEMP); 1511 return (error); 1512 } 1513 1514 switch (sopt->sopt_dir) { 1515 case SOPT_SET: 1516 switch (sopt->sopt_name) { 1517 #ifdef TCP_SIGNATURE 1518 case TCP_MD5SIG: 1519 INP_WUNLOCK(inp); 1520 error = sooptcopyin(sopt, &optval, sizeof optval, 1521 sizeof optval); 1522 if (error) 1523 return (error); 1524 1525 INP_WLOCK_RECHECK(inp); 1526 if (optval > 0) 1527 tp->t_flags |= TF_SIGNATURE; 1528 else 1529 tp->t_flags &= ~TF_SIGNATURE; 1530 goto unlock_and_done; 1531 #endif /* TCP_SIGNATURE */ 1532 1533 case TCP_NODELAY: 1534 case TCP_NOOPT: 1535 INP_WUNLOCK(inp); 1536 error = sooptcopyin(sopt, &optval, sizeof optval, 1537 sizeof optval); 1538 if (error) 1539 return (error); 1540 1541 INP_WLOCK_RECHECK(inp); 1542 switch (sopt->sopt_name) { 1543 case TCP_NODELAY: 1544 opt = TF_NODELAY; 1545 break; 1546 case TCP_NOOPT: 1547 opt = TF_NOOPT; 1548 break; 1549 default: 1550 opt = 0; /* dead code to fool gcc */ 1551 break; 1552 } 1553 1554 if (optval) 1555 tp->t_flags |= opt; 1556 else 1557 tp->t_flags &= ~opt; 1558 unlock_and_done: 1559 #ifdef TCP_OFFLOAD 1560 if (tp->t_flags & TF_TOE) { 1561 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1562 sopt->sopt_name); 1563 } 1564 #endif 1565 INP_WUNLOCK(inp); 1566 break; 1567 1568 case TCP_NOPUSH: 1569 INP_WUNLOCK(inp); 1570 error = sooptcopyin(sopt, &optval, sizeof optval, 1571 sizeof optval); 1572 if (error) 1573 return (error); 1574 1575 INP_WLOCK_RECHECK(inp); 1576 if (optval) 1577 tp->t_flags |= TF_NOPUSH; 1578 else if (tp->t_flags & TF_NOPUSH) { 1579 tp->t_flags &= ~TF_NOPUSH; 1580 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1581 error = tp->t_fb->tfb_tcp_output(tp); 1582 } 1583 goto unlock_and_done; 1584 1585 case TCP_MAXSEG: 1586 INP_WUNLOCK(inp); 1587 error = sooptcopyin(sopt, &optval, sizeof optval, 1588 sizeof optval); 1589 if (error) 1590 return (error); 1591 1592 INP_WLOCK_RECHECK(inp); 1593 if (optval > 0 && optval <= tp->t_maxseg && 1594 optval + 40 >= V_tcp_minmss) 1595 tp->t_maxseg = optval; 1596 else 1597 error = EINVAL; 1598 goto unlock_and_done; 1599 1600 case TCP_INFO: 1601 INP_WUNLOCK(inp); 1602 error = EINVAL; 1603 break; 1604 1605 case TCP_CONGESTION: 1606 INP_WUNLOCK(inp); 1607 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1608 if (error) 1609 break; 1610 buf[sopt->sopt_valsize] = '\0'; 1611 INP_WLOCK_RECHECK(inp); 1612 CC_LIST_RLOCK(); 1613 STAILQ_FOREACH(algo, &cc_list, entries) 1614 if (strncmp(buf, algo->name, 1615 TCP_CA_NAME_MAX) == 0) 1616 break; 1617 CC_LIST_RUNLOCK(); 1618 if (algo == NULL) { 1619 INP_WUNLOCK(inp); 1620 error = EINVAL; 1621 break; 1622 } 1623 /* 1624 * We hold a write lock over the tcb so it's safe to 1625 * do these things without ordering concerns. 1626 */ 1627 if (CC_ALGO(tp)->cb_destroy != NULL) 1628 CC_ALGO(tp)->cb_destroy(tp->ccv); 1629 CC_ALGO(tp) = algo; 1630 /* 1631 * If something goes pear shaped initialising the new 1632 * algo, fall back to newreno (which does not 1633 * require initialisation). 1634 */ 1635 if (algo->cb_init != NULL && 1636 algo->cb_init(tp->ccv) != 0) { 1637 CC_ALGO(tp) = &newreno_cc_algo; 1638 /* 1639 * The only reason init should fail is 1640 * because of malloc. 1641 */ 1642 error = ENOMEM; 1643 } 1644 INP_WUNLOCK(inp); 1645 break; 1646 1647 case TCP_KEEPIDLE: 1648 case TCP_KEEPINTVL: 1649 case TCP_KEEPINIT: 1650 INP_WUNLOCK(inp); 1651 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1652 if (error) 1653 return (error); 1654 1655 if (ui > (UINT_MAX / hz)) { 1656 error = EINVAL; 1657 break; 1658 } 1659 ui *= hz; 1660 1661 INP_WLOCK_RECHECK(inp); 1662 switch (sopt->sopt_name) { 1663 case TCP_KEEPIDLE: 1664 tp->t_keepidle = ui; 1665 /* 1666 * XXX: better check current remaining 1667 * timeout and "merge" it with new value. 1668 */ 1669 if ((tp->t_state > TCPS_LISTEN) && 1670 (tp->t_state <= TCPS_CLOSING)) 1671 tcp_timer_activate(tp, TT_KEEP, 1672 TP_KEEPIDLE(tp)); 1673 break; 1674 case TCP_KEEPINTVL: 1675 tp->t_keepintvl = ui; 1676 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1677 (TP_MAXIDLE(tp) > 0)) 1678 tcp_timer_activate(tp, TT_2MSL, 1679 TP_MAXIDLE(tp)); 1680 break; 1681 case TCP_KEEPINIT: 1682 tp->t_keepinit = ui; 1683 if (tp->t_state == TCPS_SYN_RECEIVED || 1684 tp->t_state == TCPS_SYN_SENT) 1685 tcp_timer_activate(tp, TT_KEEP, 1686 TP_KEEPINIT(tp)); 1687 break; 1688 } 1689 goto unlock_and_done; 1690 1691 case TCP_KEEPCNT: 1692 INP_WUNLOCK(inp); 1693 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1694 if (error) 1695 return (error); 1696 1697 INP_WLOCK_RECHECK(inp); 1698 tp->t_keepcnt = ui; 1699 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1700 (TP_MAXIDLE(tp) > 0)) 1701 tcp_timer_activate(tp, TT_2MSL, 1702 TP_MAXIDLE(tp)); 1703 goto unlock_and_done; 1704 1705 #ifdef TCPPCAP 1706 case TCP_PCAP_OUT: 1707 case TCP_PCAP_IN: 1708 INP_WUNLOCK(inp); 1709 error = sooptcopyin(sopt, &optval, sizeof optval, 1710 sizeof optval); 1711 if (error) 1712 return (error); 1713 1714 INP_WLOCK_RECHECK(inp); 1715 if (optval >= 0) 1716 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1717 &(tp->t_outpkts) : &(tp->t_inpkts), 1718 optval); 1719 else 1720 error = EINVAL; 1721 goto unlock_and_done; 1722 #endif 1723 1724 #ifdef TCP_RFC7413 1725 case TCP_FASTOPEN: 1726 INP_WUNLOCK(inp); 1727 if (!V_tcp_fastopen_enabled) 1728 return (EPERM); 1729 1730 error = sooptcopyin(sopt, &optval, sizeof optval, 1731 sizeof optval); 1732 if (error) 1733 return (error); 1734 1735 INP_WLOCK_RECHECK(inp); 1736 if (optval) { 1737 tp->t_flags |= TF_FASTOPEN; 1738 if ((tp->t_state == TCPS_LISTEN) && 1739 (tp->t_tfo_pending == NULL)) 1740 tp->t_tfo_pending = 1741 tcp_fastopen_alloc_counter(); 1742 } else 1743 tp->t_flags &= ~TF_FASTOPEN; 1744 goto unlock_and_done; 1745 #endif 1746 1747 default: 1748 INP_WUNLOCK(inp); 1749 error = ENOPROTOOPT; 1750 break; 1751 } 1752 break; 1753 1754 case SOPT_GET: 1755 tp = intotcpcb(inp); 1756 switch (sopt->sopt_name) { 1757 #ifdef TCP_SIGNATURE 1758 case TCP_MD5SIG: 1759 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1760 INP_WUNLOCK(inp); 1761 error = sooptcopyout(sopt, &optval, sizeof optval); 1762 break; 1763 #endif 1764 1765 case TCP_NODELAY: 1766 optval = tp->t_flags & TF_NODELAY; 1767 INP_WUNLOCK(inp); 1768 error = sooptcopyout(sopt, &optval, sizeof optval); 1769 break; 1770 case TCP_MAXSEG: 1771 optval = tp->t_maxseg; 1772 INP_WUNLOCK(inp); 1773 error = sooptcopyout(sopt, &optval, sizeof optval); 1774 break; 1775 case TCP_NOOPT: 1776 optval = tp->t_flags & TF_NOOPT; 1777 INP_WUNLOCK(inp); 1778 error = sooptcopyout(sopt, &optval, sizeof optval); 1779 break; 1780 case TCP_NOPUSH: 1781 optval = tp->t_flags & TF_NOPUSH; 1782 INP_WUNLOCK(inp); 1783 error = sooptcopyout(sopt, &optval, sizeof optval); 1784 break; 1785 case TCP_INFO: 1786 tcp_fill_info(tp, &ti); 1787 INP_WUNLOCK(inp); 1788 error = sooptcopyout(sopt, &ti, sizeof ti); 1789 break; 1790 case TCP_CONGESTION: 1791 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1792 INP_WUNLOCK(inp); 1793 error = sooptcopyout(sopt, buf, len + 1); 1794 break; 1795 case TCP_KEEPIDLE: 1796 case TCP_KEEPINTVL: 1797 case TCP_KEEPINIT: 1798 case TCP_KEEPCNT: 1799 switch (sopt->sopt_name) { 1800 case TCP_KEEPIDLE: 1801 ui = tp->t_keepidle / hz; 1802 break; 1803 case TCP_KEEPINTVL: 1804 ui = tp->t_keepintvl / hz; 1805 break; 1806 case TCP_KEEPINIT: 1807 ui = tp->t_keepinit / hz; 1808 break; 1809 case TCP_KEEPCNT: 1810 ui = tp->t_keepcnt; 1811 break; 1812 } 1813 INP_WUNLOCK(inp); 1814 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1815 break; 1816 #ifdef TCPPCAP 1817 case TCP_PCAP_OUT: 1818 case TCP_PCAP_IN: 1819 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1820 &(tp->t_outpkts) : &(tp->t_inpkts)); 1821 INP_WUNLOCK(inp); 1822 error = sooptcopyout(sopt, &optval, sizeof optval); 1823 break; 1824 #endif 1825 1826 #ifdef TCP_RFC7413 1827 case TCP_FASTOPEN: 1828 optval = tp->t_flags & TF_FASTOPEN; 1829 INP_WUNLOCK(inp); 1830 error = sooptcopyout(sopt, &optval, sizeof optval); 1831 break; 1832 #endif 1833 default: 1834 INP_WUNLOCK(inp); 1835 error = ENOPROTOOPT; 1836 break; 1837 } 1838 break; 1839 } 1840 return (error); 1841 } 1842 #undef INP_WLOCK_RECHECK 1843 #undef INP_WLOCK_RECHECK_CLEANUP 1844 1845 /* 1846 * Attach TCP protocol to socket, allocating 1847 * internet protocol control block, tcp control block, 1848 * bufer space, and entering LISTEN state if to accept connections. 1849 */ 1850 static int 1851 tcp_attach(struct socket *so) 1852 { 1853 struct tcpcb *tp; 1854 struct inpcb *inp; 1855 int error; 1856 1857 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1858 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1859 if (error) 1860 return (error); 1861 } 1862 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1863 so->so_snd.sb_flags |= SB_AUTOSIZE; 1864 INP_INFO_RLOCK(&V_tcbinfo); 1865 error = in_pcballoc(so, &V_tcbinfo); 1866 if (error) { 1867 INP_INFO_RUNLOCK(&V_tcbinfo); 1868 return (error); 1869 } 1870 inp = sotoinpcb(so); 1871 #ifdef INET6 1872 if (inp->inp_vflag & INP_IPV6PROTO) { 1873 inp->inp_vflag |= INP_IPV6; 1874 inp->in6p_hops = -1; /* use kernel default */ 1875 } 1876 else 1877 #endif 1878 inp->inp_vflag |= INP_IPV4; 1879 tp = tcp_newtcpcb(inp); 1880 if (tp == NULL) { 1881 in_pcbdetach(inp); 1882 in_pcbfree(inp); 1883 INP_INFO_RUNLOCK(&V_tcbinfo); 1884 return (ENOBUFS); 1885 } 1886 tp->t_state = TCPS_CLOSED; 1887 INP_WUNLOCK(inp); 1888 INP_INFO_RUNLOCK(&V_tcbinfo); 1889 TCPSTATES_INC(TCPS_CLOSED); 1890 return (0); 1891 } 1892 1893 /* 1894 * Initiate (or continue) disconnect. 1895 * If embryonic state, just send reset (once). 1896 * If in ``let data drain'' option and linger null, just drop. 1897 * Otherwise (hard), mark socket disconnecting and drop 1898 * current input data; switch states based on user close, and 1899 * send segment to peer (with FIN). 1900 */ 1901 static void 1902 tcp_disconnect(struct tcpcb *tp) 1903 { 1904 struct inpcb *inp = tp->t_inpcb; 1905 struct socket *so = inp->inp_socket; 1906 1907 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1908 INP_WLOCK_ASSERT(inp); 1909 1910 /* 1911 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1912 * socket is still open. 1913 */ 1914 if (tp->t_state < TCPS_ESTABLISHED) { 1915 tp = tcp_close(tp); 1916 KASSERT(tp != NULL, 1917 ("tcp_disconnect: tcp_close() returned NULL")); 1918 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1919 tp = tcp_drop(tp, 0); 1920 KASSERT(tp != NULL, 1921 ("tcp_disconnect: tcp_drop() returned NULL")); 1922 } else { 1923 soisdisconnecting(so); 1924 sbflush(&so->so_rcv); 1925 tcp_usrclosed(tp); 1926 if (!(inp->inp_flags & INP_DROPPED)) 1927 tp->t_fb->tfb_tcp_output(tp); 1928 } 1929 } 1930 1931 /* 1932 * User issued close, and wish to trail through shutdown states: 1933 * if never received SYN, just forget it. If got a SYN from peer, 1934 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1935 * If already got a FIN from peer, then almost done; go to LAST_ACK 1936 * state. In all other cases, have already sent FIN to peer (e.g. 1937 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1938 * for peer to send FIN or not respond to keep-alives, etc. 1939 * We can let the user exit from the close as soon as the FIN is acked. 1940 */ 1941 static void 1942 tcp_usrclosed(struct tcpcb *tp) 1943 { 1944 1945 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1946 INP_WLOCK_ASSERT(tp->t_inpcb); 1947 1948 switch (tp->t_state) { 1949 case TCPS_LISTEN: 1950 #ifdef TCP_OFFLOAD 1951 tcp_offload_listen_stop(tp); 1952 #endif 1953 tcp_state_change(tp, TCPS_CLOSED); 1954 /* FALLTHROUGH */ 1955 case TCPS_CLOSED: 1956 tp = tcp_close(tp); 1957 /* 1958 * tcp_close() should never return NULL here as the socket is 1959 * still open. 1960 */ 1961 KASSERT(tp != NULL, 1962 ("tcp_usrclosed: tcp_close() returned NULL")); 1963 break; 1964 1965 case TCPS_SYN_SENT: 1966 case TCPS_SYN_RECEIVED: 1967 tp->t_flags |= TF_NEEDFIN; 1968 break; 1969 1970 case TCPS_ESTABLISHED: 1971 tcp_state_change(tp, TCPS_FIN_WAIT_1); 1972 break; 1973 1974 case TCPS_CLOSE_WAIT: 1975 tcp_state_change(tp, TCPS_LAST_ACK); 1976 break; 1977 } 1978 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1979 soisdisconnected(tp->t_inpcb->inp_socket); 1980 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1981 if (tp->t_state == TCPS_FIN_WAIT_2) { 1982 int timeout; 1983 1984 timeout = (tcp_fast_finwait2_recycle) ? 1985 tcp_finwait2_timeout : TP_MAXIDLE(tp); 1986 tcp_timer_activate(tp, TT_2MSL, timeout); 1987 } 1988 } 1989 } 1990 1991 #ifdef DDB 1992 static void 1993 db_print_indent(int indent) 1994 { 1995 int i; 1996 1997 for (i = 0; i < indent; i++) 1998 db_printf(" "); 1999 } 2000 2001 static void 2002 db_print_tstate(int t_state) 2003 { 2004 2005 switch (t_state) { 2006 case TCPS_CLOSED: 2007 db_printf("TCPS_CLOSED"); 2008 return; 2009 2010 case TCPS_LISTEN: 2011 db_printf("TCPS_LISTEN"); 2012 return; 2013 2014 case TCPS_SYN_SENT: 2015 db_printf("TCPS_SYN_SENT"); 2016 return; 2017 2018 case TCPS_SYN_RECEIVED: 2019 db_printf("TCPS_SYN_RECEIVED"); 2020 return; 2021 2022 case TCPS_ESTABLISHED: 2023 db_printf("TCPS_ESTABLISHED"); 2024 return; 2025 2026 case TCPS_CLOSE_WAIT: 2027 db_printf("TCPS_CLOSE_WAIT"); 2028 return; 2029 2030 case TCPS_FIN_WAIT_1: 2031 db_printf("TCPS_FIN_WAIT_1"); 2032 return; 2033 2034 case TCPS_CLOSING: 2035 db_printf("TCPS_CLOSING"); 2036 return; 2037 2038 case TCPS_LAST_ACK: 2039 db_printf("TCPS_LAST_ACK"); 2040 return; 2041 2042 case TCPS_FIN_WAIT_2: 2043 db_printf("TCPS_FIN_WAIT_2"); 2044 return; 2045 2046 case TCPS_TIME_WAIT: 2047 db_printf("TCPS_TIME_WAIT"); 2048 return; 2049 2050 default: 2051 db_printf("unknown"); 2052 return; 2053 } 2054 } 2055 2056 static void 2057 db_print_tflags(u_int t_flags) 2058 { 2059 int comma; 2060 2061 comma = 0; 2062 if (t_flags & TF_ACKNOW) { 2063 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2064 comma = 1; 2065 } 2066 if (t_flags & TF_DELACK) { 2067 db_printf("%sTF_DELACK", comma ? ", " : ""); 2068 comma = 1; 2069 } 2070 if (t_flags & TF_NODELAY) { 2071 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2072 comma = 1; 2073 } 2074 if (t_flags & TF_NOOPT) { 2075 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2076 comma = 1; 2077 } 2078 if (t_flags & TF_SENTFIN) { 2079 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2080 comma = 1; 2081 } 2082 if (t_flags & TF_REQ_SCALE) { 2083 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2084 comma = 1; 2085 } 2086 if (t_flags & TF_RCVD_SCALE) { 2087 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2088 comma = 1; 2089 } 2090 if (t_flags & TF_REQ_TSTMP) { 2091 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2092 comma = 1; 2093 } 2094 if (t_flags & TF_RCVD_TSTMP) { 2095 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2096 comma = 1; 2097 } 2098 if (t_flags & TF_SACK_PERMIT) { 2099 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2100 comma = 1; 2101 } 2102 if (t_flags & TF_NEEDSYN) { 2103 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2104 comma = 1; 2105 } 2106 if (t_flags & TF_NEEDFIN) { 2107 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2108 comma = 1; 2109 } 2110 if (t_flags & TF_NOPUSH) { 2111 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2112 comma = 1; 2113 } 2114 if (t_flags & TF_MORETOCOME) { 2115 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2116 comma = 1; 2117 } 2118 if (t_flags & TF_LQ_OVERFLOW) { 2119 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2120 comma = 1; 2121 } 2122 if (t_flags & TF_LASTIDLE) { 2123 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2124 comma = 1; 2125 } 2126 if (t_flags & TF_RXWIN0SENT) { 2127 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2128 comma = 1; 2129 } 2130 if (t_flags & TF_FASTRECOVERY) { 2131 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2132 comma = 1; 2133 } 2134 if (t_flags & TF_CONGRECOVERY) { 2135 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2136 comma = 1; 2137 } 2138 if (t_flags & TF_WASFRECOVERY) { 2139 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2140 comma = 1; 2141 } 2142 if (t_flags & TF_SIGNATURE) { 2143 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2144 comma = 1; 2145 } 2146 if (t_flags & TF_FORCEDATA) { 2147 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2148 comma = 1; 2149 } 2150 if (t_flags & TF_TSO) { 2151 db_printf("%sTF_TSO", comma ? ", " : ""); 2152 comma = 1; 2153 } 2154 if (t_flags & TF_ECN_PERMIT) { 2155 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2156 comma = 1; 2157 } 2158 if (t_flags & TF_FASTOPEN) { 2159 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2160 comma = 1; 2161 } 2162 } 2163 2164 static void 2165 db_print_toobflags(char t_oobflags) 2166 { 2167 int comma; 2168 2169 comma = 0; 2170 if (t_oobflags & TCPOOB_HAVEDATA) { 2171 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2172 comma = 1; 2173 } 2174 if (t_oobflags & TCPOOB_HADDATA) { 2175 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2176 comma = 1; 2177 } 2178 } 2179 2180 static void 2181 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2182 { 2183 2184 db_print_indent(indent); 2185 db_printf("%s at %p\n", name, tp); 2186 2187 indent += 2; 2188 2189 db_print_indent(indent); 2190 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2191 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2192 2193 db_print_indent(indent); 2194 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2195 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2196 2197 db_print_indent(indent); 2198 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2199 &tp->t_timers->tt_delack, tp->t_inpcb); 2200 2201 db_print_indent(indent); 2202 db_printf("t_state: %d (", tp->t_state); 2203 db_print_tstate(tp->t_state); 2204 db_printf(")\n"); 2205 2206 db_print_indent(indent); 2207 db_printf("t_flags: 0x%x (", tp->t_flags); 2208 db_print_tflags(tp->t_flags); 2209 db_printf(")\n"); 2210 2211 db_print_indent(indent); 2212 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2213 tp->snd_una, tp->snd_max, tp->snd_nxt); 2214 2215 db_print_indent(indent); 2216 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2217 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2218 2219 db_print_indent(indent); 2220 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2221 tp->iss, tp->irs, tp->rcv_nxt); 2222 2223 db_print_indent(indent); 2224 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2225 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2226 2227 db_print_indent(indent); 2228 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2229 tp->snd_wnd, tp->snd_cwnd); 2230 2231 db_print_indent(indent); 2232 db_printf("snd_ssthresh: %lu snd_recover: " 2233 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2234 2235 db_print_indent(indent); 2236 db_printf("t_rcvtime: %u t_startime: %u\n", 2237 tp->t_rcvtime, tp->t_starttime); 2238 2239 db_print_indent(indent); 2240 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2241 tp->t_rtttime, tp->t_rtseq); 2242 2243 db_print_indent(indent); 2244 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2245 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2246 2247 db_print_indent(indent); 2248 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2249 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2250 tp->t_rttbest); 2251 2252 db_print_indent(indent); 2253 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2254 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2255 2256 db_print_indent(indent); 2257 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2258 db_print_toobflags(tp->t_oobflags); 2259 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2260 2261 db_print_indent(indent); 2262 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2263 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2264 2265 db_print_indent(indent); 2266 db_printf("ts_recent: %u ts_recent_age: %u\n", 2267 tp->ts_recent, tp->ts_recent_age); 2268 2269 db_print_indent(indent); 2270 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2271 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2272 2273 db_print_indent(indent); 2274 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2275 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2276 tp->snd_recover_prev, tp->t_badrxtwin); 2277 2278 db_print_indent(indent); 2279 db_printf("snd_numholes: %d snd_holes first: %p\n", 2280 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2281 2282 db_print_indent(indent); 2283 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2284 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2285 2286 /* Skip sackblks, sackhint. */ 2287 2288 db_print_indent(indent); 2289 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2290 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2291 } 2292 2293 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2294 { 2295 struct tcpcb *tp; 2296 2297 if (!have_addr) { 2298 db_printf("usage: show tcpcb <addr>\n"); 2299 return; 2300 } 2301 tp = (struct tcpcb *)addr; 2302 2303 db_print_tcpcb(tp, "tcpcb", 0); 2304 } 2305 #endif
Cache object: c7b9049c8c66628be16d5dba4e9a5a3a
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